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Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Browse Source 
Pull i2c changes from Wolfram Sang:

 - an arbitration driver.  While the driver is quite simple, it caused
   discussion if we need additional arbitration on top of the one
   specified in the I2C standard.  Conclusion is that I accept a few
   generic mechanisms, but not very specific ones.

 - the core lost the detach_adapter() call.  It has no users anymore and
   was in the way for other cleanups.  attach_adapter() is sadly still
   there since there are users waiting to be converted.

 - the core gained a bus recovery infrastructure.  I2C defines a way to
   recover if the data line is stalled.  This mechanism is now in the
   core and drivers can now pass some data to make use of it.

 - bigger driver cleanups for designware, s3c2410

 - removing superfluous refcounting from drivers

 - removing Ben Dooks as second maintainer due to inactivity.  Thanks
   for all your work so far, Ben!

 - bugfixes, feature additions, devicetree fixups, simplifications...

* 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (38 commits)
  i2c: xiic: must always write 16-bit words to TX_FIFO
  i2c: octeon: use HZ in timeout value
  i2c: octeon: Fix i2c fail problem when a process is terminated by a signal
  i2c: designware-pci: drop superfluous {get|put}_device
  i2c: designware-plat: drop superfluous {get|put}_device
  i2c: davinci: drop superfluous {get|put}_device
  MAINTAINERS: Ben Dooks is inactive regarding I2C
  i2c: mux: Add i2c-arb-gpio-challenge 'mux' driver
  i2c: at91: convert to dma_request_slave_channel_compat()
  i2c: mxs: do error checking and handling in PIO mode
  i2c: mxs: remove races in PIO code
  i2c-designware: switch to use runtime PM autosuspend
  i2c-designware: use usleep_range() in the busy-loop
  i2c-designware: enable/disable the controller properly
  i2c-designware: use dynamic adapter numbering on Lynxpoint
  i2c-designware-pci: use managed functions pcim_* and devm_*
  i2c-designware-pci: use dev_err() instead of printk()
  i2c-designware: move to managed functions (devm_*)
  i2c: remove CONFIG_HOTPLUG ifdefs
  i2c: s3c2410: Add SMBus emulation for block read
  ...
This commit is contained in:
Linus Torvalds 2013-05-02 14:38:53 -07:00
commit 99bece775f
42 changed files with 960 additions and 497 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
Documentation/devicetree/bindings/i2c/i2c-arb-gpio-challenge.txt Normal file
View File

@ -0,0 +1,80 @@
GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
=================================================================
This uses GPIO lines and a challenge & response mechanism to arbitrate who is
the master of an I2C bus in a multimaster situation.
In many cases using GPIOs to arbitrate is not needed and a design can use
the standard I2C multi-master rules. Using GPIOs is generally useful in
the case where there is a device on the bus that has errata and/or bugs
that makes standard multimaster mode not feasible.
Algorithm:
All masters on the bus have a 'bus claim' line which is an output that the
others can see. These are all active low with pull-ups enabled. We'll
describe these lines as:
- OUR_CLAIM: output from us signaling to other hosts that we want the bus
- THEIR_CLAIMS: output from others signaling that they want the bus
The basic algorithm is to assert your line when you want the bus, then make
sure that the other side doesn't want it also. A detailed explanation is best
done with an example.
Let's say we want to claim the bus. We:
1. Assert OUR_CLAIM.
2. Waits a little bit for the other sides to notice (slew time, say 10
microseconds).
3. Check THEIR_CLAIMS. If none are asserted then the we have the bus and we are
done.
4. Otherwise, wait for a few milliseconds and see if THEIR_CLAIMS are released.
5. If not, back off, release the claim and wait for a few more milliseconds.
6. Go back to 1 (until retry time has expired).
Required properties:
- compatible: i2c-arb-gpio-challenge
- our-claim-gpio: The GPIO that we use to claim the bus.
- their-claim-gpios: The GPIOs that the other sides use to claim the bus.
Note that some implementations may only support a single other master.
- Standard I2C mux properties. See mux.txt in this directory.
- Single I2C child bus node at reg 0. See mux.txt in this directory.
Optional properties:
- slew-delay-us: microseconds to wait for a GPIO to go high. Default is 10 us.
- wait-retry-us: we'll attempt another claim after this many microseconds.
Default is 3000 us.
- wait-free-us: we'll give up after this many microseconds. Default is 50000 us.
Example:
i2c@12CA0000 {
compatible = "acme,some-i2c-device";
#address-cells = <1>;
#size-cells = <0>;
};
i2c-arbitrator {
compatible = "i2c-arb-gpio-challenge";
#address-cells = <1>;
#size-cells = <0>;
i2c-parent = <&{/i2c@12CA0000}>;
our-claim-gpio = <&gpf0 3 1>;
their-claim-gpios = <&gpe0 4 1>;
slew-delay-us = <10>;
wait-retry-us = <3000>;
wait-free-us = <50000>;
i2c@0 {
reg = <0>;
#address-cells = <1>;
#size-cells = <0>;
i2c@52 {
// Normal I2C device
};
};
};

1
MAINTAINERS
View File

@ -3919,7 +3919,6 @@ F: drivers/i2c/i2c-stub.c
I2C SUBSYSTEM
M: Wolfram Sang <wsa@the-dreams.de>
M: "Ben Dooks (embedded platforms)" <ben-linux@fluff.org>
L: linux-i2c@vger.kernel.org
W: http://i2c.wiki.kernel.org/
T: git git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git

1
arch/arm/mach-s3c24xx/mach-rx1950.c
View File

@ -56,7 +56,6 @@
#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/pm.h>
#include <plat/regs-iic.h>
#include <plat/regs-serial.h>
#include "common.h"

2
arch/arm/mach-tegra/tegra.c
View File

@ -31,8 +31,6 @@
#include <linux/pda_power.h>
#include <linux/platform_data/tegra_usb.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/i2c-tegra.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include <linux/usb/tegra_usb_phy.h>

1
arch/arm/plat-samsung/devs.c
View File

@ -63,7 +63,6 @@
#include <linux/platform_data/usb-s3c2410_udc.h>
#include <linux/platform_data/usb-ohci-s3c2410.h>
#include <plat/usb-phy.h>
#include <plat/regs-iic.h>
#include <plat/regs-serial.h>
#include <plat/regs-spi.h>
#include <linux/platform_data/spi-s3c64xx.h>

56
arch/arm/plat-samsung/include/plat/regs-iic.h
View File

@ -1,56 +0,0 @@
/* arch/arm/mach-s3c2410/include/mach/regs-iic.h
*
* Copyright (c) 2004 Simtec Electronics <linux@simtec.co.uk>
* http://www.simtec.co.uk/products/SWLINUX/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* S3C2410 I2C Controller
*/
#ifndef __ASM_ARCH_REGS_IIC_H
#define __ASM_ARCH_REGS_IIC_H __FILE__
/* see s3c2410x user guide, v1.1, section 9 (p447) for more info */
#define S3C2410_IICREG(x) (x)
#define S3C2410_IICCON S3C2410_IICREG(0x00)
#define S3C2410_IICSTAT S3C2410_IICREG(0x04)
#define S3C2410_IICADD S3C2410_IICREG(0x08)
#define S3C2410_IICDS S3C2410_IICREG(0x0C)
#define S3C2440_IICLC S3C2410_IICREG(0x10)
#define S3C2410_IICCON_ACKEN (1<<7)
#define S3C2410_IICCON_TXDIV_16 (0<<6)
#define S3C2410_IICCON_TXDIV_512 (1<<6)
#define S3C2410_IICCON_IRQEN (1<<5)
#define S3C2410_IICCON_IRQPEND (1<<4)
#define S3C2410_IICCON_SCALE(x) ((x)&15)
#define S3C2410_IICCON_SCALEMASK (0xf)
#define S3C2410_IICSTAT_MASTER_RX (2<<6)
#define S3C2410_IICSTAT_MASTER_TX (3<<6)
#define S3C2410_IICSTAT_SLAVE_RX (0<<6)
#define S3C2410_IICSTAT_SLAVE_TX (1<<6)
#define S3C2410_IICSTAT_MODEMASK (3<<6)
#define S3C2410_IICSTAT_START (1<<5)
#define S3C2410_IICSTAT_BUSBUSY (1<<5)
#define S3C2410_IICSTAT_TXRXEN (1<<4)
#define S3C2410_IICSTAT_ARBITR (1<<3)
#define S3C2410_IICSTAT_ASSLAVE (1<<2)
#define S3C2410_IICSTAT_ADDR0 (1<<1)
#define S3C2410_IICSTAT_LASTBIT (1<<0)
#define S3C2410_IICLC_SDA_DELAY0 (0 << 0)
#define S3C2410_IICLC_SDA_DELAY5 (1 << 0)
#define S3C2410_IICLC_SDA_DELAY10 (2 << 0)
#define S3C2410_IICLC_SDA_DELAY15 (3 << 0)
#define S3C2410_IICLC_SDA_DELAY_MASK (3 << 0)
#define S3C2410_IICLC_FILTER_ON (1<<2)
#endif /* __ASM_ARCH_REGS_IIC_H */

3
drivers/gpu/drm/gma500/oaktrail_hdmi_i2c.c
View File

@ -319,8 +319,7 @@ void oaktrail_hdmi_i2c_exit(struct pci_dev *dev)
struct hdmi_i2c_dev *i2c_dev;
hdmi_dev = pci_get_drvdata(dev);
if (i2c_del_adapter(&oaktrail_hdmi_i2c_adapter))
DRM_DEBUG_DRIVER("Failed to delete hdmi-i2c adapter\n");
i2c_del_adapter(&oaktrail_hdmi_i2c_adapter);
i2c_dev = hdmi_dev->i2c_dev;
kfree(i2c_dev);

6
drivers/i2c/busses/i2c-amd756-s4882.c
View File

@ -169,11 +169,7 @@ static int __init amd756_s4882_init(void)
}
/* Unregister physical bus */
error = i2c_del_adapter(&amd756_smbus);
if (error) {
dev_err(&amd756_smbus.dev, "Physical bus removal failed\n");
goto ERROR0;
}
i2c_del_adapter(&amd756_smbus);
printk(KERN_INFO "Enabling SMBus multiplexing for Tyan S4882\n");
/* Define the 5 virtual adapters and algorithms structures */

58
drivers/i2c/busses/i2c-at91.c
View File

@ -603,15 +603,18 @@ static const struct of_device_id atmel_twi_dt_ids[] = {
}
};
MODULE_DEVICE_TABLE(of, atmel_twi_dt_ids);
#else
#define atmel_twi_dt_ids NULL
#endif
static bool filter(struct dma_chan *chan, void *slave)
static bool filter(struct dma_chan *chan, void *pdata)
{
struct at_dma_slave *sl = slave;
struct at91_twi_pdata *sl_pdata = pdata;
struct at_dma_slave *sl;
if (sl->dma_dev == chan->device->dev) {
if (!sl_pdata)
return false;
sl = &sl_pdata->dma_slave;
if (sl && (sl->dma_dev == chan->device->dev)) {
chan->private = sl;
return true;
} else {
@ -622,11 +625,10 @@ static bool filter(struct dma_chan *chan, void *slave)
static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
{
int ret = 0;
struct at_dma_slave *sdata;
struct at91_twi_pdata *pdata = dev->pdata;
struct dma_slave_config slave_config;
struct at91_twi_dma *dma = &dev->dma;
sdata = &dev->pdata->dma_slave;
dma_cap_mask_t mask;
memset(&slave_config, 0, sizeof(slave_config));
slave_config.src_addr = (dma_addr_t)phy_addr + AT91_TWI_RHR;
@ -637,25 +639,22 @@ static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
slave_config.dst_maxburst = 1;
slave_config.device_fc = false;
if (sdata && sdata->dma_dev) {
dma_cap_mask_t mask;
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
dma->chan_tx = dma_request_channel(mask, filter, sdata);
if (!dma->chan_tx) {
dev_err(dev->dev, "no DMA channel available for tx\n");
ret = -EBUSY;
goto error;
}
dma->chan_rx = dma_request_channel(mask, filter, sdata);
if (!dma->chan_rx) {
dev_err(dev->dev, "no DMA channel available for rx\n");
ret = -EBUSY;
goto error;
}
} else {
ret = -EINVAL;
dma->chan_tx = dma_request_slave_channel_compat(mask, filter, pdata,
dev->dev, "tx");
if (!dma->chan_tx) {
dev_err(dev->dev, "can't get a DMA channel for tx\n");
ret = -EBUSY;
goto error;
}
dma->chan_rx = dma_request_slave_channel_compat(mask, filter, pdata,
dev->dev, "rx");
if (!dma->chan_rx) {
dev_err(dev->dev, "can't get a DMA channel for rx\n");
ret = -EBUSY;
goto error;
}
@ -785,12 +784,11 @@ static int at91_twi_probe(struct platform_device *pdev)
static int at91_twi_remove(struct platform_device *pdev)
{
struct at91_twi_dev *dev = platform_get_drvdata(pdev);
int rc;
rc = i2c_del_adapter(&dev->adapter);
i2c_del_adapter(&dev->adapter);
clk_disable_unprepare(dev->clk);
return rc;
return 0;
}
#ifdef CONFIG_PM
@ -828,7 +826,7 @@ static struct platform_driver at91_twi_driver = {
.driver = {
.name = "at91_i2c",
.owner = THIS_MODULE,
.of_match_table = atmel_twi_dt_ids,
.of_match_table = of_match_ptr(atmel_twi_dt_ids),
.pm = at91_twi_pm_ops,
},
};

4
drivers/i2c/busses/i2c-cbus-gpio.c
View File

@ -206,7 +206,9 @@ static int cbus_i2c_remove(struct platform_device *pdev)
{
struct i2c_adapter *adapter = platform_get_drvdata(pdev);
return i2c_del_adapter(adapter);
i2c_del_adapter(adapter);
return 0;
}
static int cbus_i2c_probe(struct platform_device *pdev)

77
drivers/i2c/busses/i2c-davinci.c
View File

@ -137,7 +137,7 @@ static inline u16 davinci_i2c_read_reg(struct davinci_i2c_dev *i2c_dev, int reg)
}
/* Generate a pulse on the i2c clock pin. */
static void generic_i2c_clock_pulse(unsigned int scl_pin)
static void davinci_i2c_clock_pulse(unsigned int scl_pin)
{
u16 i;
@ -155,7 +155,7 @@ static void generic_i2c_clock_pulse(unsigned int scl_pin)
/* This routine does i2c bus recovery as specified in the
* i2c protocol Rev. 03 section 3.16 titled "Bus clear"
*/
static void i2c_recover_bus(struct davinci_i2c_dev *dev)
static void davinci_i2c_recover_bus(struct davinci_i2c_dev *dev)
{
u32 flag = 0;
struct davinci_i2c_platform_data *pdata = dev->pdata;
@ -166,7 +166,7 @@ static void i2c_recover_bus(struct davinci_i2c_dev *dev)
flag |= DAVINCI_I2C_MDR_NACK;
/* write the data into mode register */
davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag);
generic_i2c_clock_pulse(pdata->scl_pin);
davinci_i2c_clock_pulse(pdata->scl_pin);
/* Send STOP */
flag = davinci_i2c_read_reg(dev, DAVINCI_I2C_MDR_REG);
flag |= DAVINCI_I2C_MDR_STP;
@ -289,7 +289,7 @@ static int i2c_davinci_wait_bus_not_busy(struct davinci_i2c_dev *dev,
return -ETIMEDOUT;
} else {
to_cnt = 0;
i2c_recover_bus(dev);
davinci_i2c_recover_bus(dev);
i2c_davinci_init(dev);
}
}
@ -379,7 +379,7 @@ i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop)
dev->adapter.timeout);
if (r == 0) {
dev_err(dev->dev, "controller timed out\n");
i2c_recover_bus(dev);
davinci_i2c_recover_bus(dev);
i2c_davinci_init(dev);
dev->buf_len = 0;
return -ETIMEDOUT;
@ -643,7 +643,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
{
struct davinci_i2c_dev *dev;
struct i2c_adapter *adap;
struct resource *mem, *irq, *ioarea;
struct resource *mem, *irq;
int r;
/* NOTE: driver uses the static register mapping */
@ -659,24 +659,18 @@ static int davinci_i2c_probe(struct platform_device *pdev)
return -ENODEV;
}
ioarea = request_mem_region(mem->start, resource_size(mem),
pdev->name);
if (!ioarea) {
dev_err(&pdev->dev, "I2C region already claimed\n");
return -EBUSY;
}
dev = kzalloc(sizeof(struct davinci_i2c_dev), GFP_KERNEL);
dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_i2c_dev),
GFP_KERNEL);
if (!dev) {
r = -ENOMEM;
goto err_release_region;
dev_err(&pdev->dev, "Memory allocation failed\n");
return -ENOMEM;
}
init_completion(&dev->cmd_complete);
#ifdef CONFIG_CPU_FREQ
init_completion(&dev->xfr_complete);
#endif
dev->dev = get_device(&pdev->dev);
dev->dev = &pdev->dev;
dev->irq = irq->start;
dev->pdata = dev->dev->platform_data;
platform_set_drvdata(pdev, dev);
@ -686,10 +680,9 @@ static int davinci_i2c_probe(struct platform_device *pdev)
dev->pdata = devm_kzalloc(&pdev->dev,
sizeof(struct davinci_i2c_platform_data), GFP_KERNEL);
if (!dev->pdata) {
r = -ENOMEM;
goto err_free_mem;
}
if (!dev->pdata)
return -ENOMEM;
memcpy(dev->pdata, &davinci_i2c_platform_data_default,
sizeof(struct davinci_i2c_platform_data));
if (!of_property_read_u32(pdev->dev.of_node, "clock-frequency",
@ -699,22 +692,21 @@ static int davinci_i2c_probe(struct platform_device *pdev)
dev->pdata = &davinci_i2c_platform_data_default;
}
dev->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk)) {
r = -ENODEV;
goto err_free_mem;
}
dev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dev->clk))
return -ENODEV;
clk_prepare_enable(dev->clk);
dev->base = ioremap(mem->start, resource_size(mem));
if (!dev->base) {
r = -EBUSY;
goto err_mem_ioremap;
dev->base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(dev->base)) {
r = PTR_ERR(dev->base);
goto err_unuse_clocks;
}
i2c_davinci_init(dev);
r = request_irq(dev->irq, i2c_davinci_isr, 0, pdev->name, dev);
r = devm_request_irq(&pdev->dev, dev->irq, i2c_davinci_isr, 0,
pdev->name, dev);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
goto err_unuse_clocks;
@ -723,7 +715,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
r = i2c_davinci_cpufreq_register(dev);
if (r) {
dev_err(&pdev->dev, "failed to register cpufreq\n");
goto err_free_irq;
goto err_unuse_clocks;
}
adap = &dev->adapter;
@ -740,50 +732,31 @@ static int davinci_i2c_probe(struct platform_device *pdev)
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
goto err_free_irq;
goto err_unuse_clocks;
}
of_i2c_register_devices(adap);
return 0;
err_free_irq:
free_irq(dev->irq, dev);
err_unuse_clocks:
iounmap(dev->base);
err_mem_ioremap:
clk_disable_unprepare(dev->clk);
clk_put(dev->clk);
dev->clk = NULL;
err_free_mem:
put_device(&pdev->dev);
kfree(dev);
err_release_region:
release_mem_region(mem->start, resource_size(mem));
return r;
}
static int davinci_i2c_remove(struct platform_device *pdev)
{
struct davinci_i2c_dev *dev = platform_get_drvdata(pdev);
struct resource *mem;
i2c_davinci_cpufreq_deregister(dev);
i2c_del_adapter(&dev->adapter);
put_device(&pdev->dev);
clk_disable_unprepare(dev->clk);
clk_put(dev->clk);
dev->clk = NULL;
davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, 0);
free_irq(dev->irq, dev);
iounmap(dev->base);
kfree(dev);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(mem->start, resource_size(mem));
return 0;
}

39
drivers/i2c/busses/i2c-designware-core.c
View File

@ -68,6 +68,7 @@
#define DW_IC_TXFLR 0x74
#define DW_IC_RXFLR 0x78
#define DW_IC_TX_ABRT_SOURCE 0x80
#define DW_IC_ENABLE_STATUS 0x9c
#define DW_IC_COMP_PARAM_1 0xf4
#define DW_IC_COMP_TYPE 0xfc
#define DW_IC_COMP_TYPE_VALUE 0x44570140
@ -248,6 +249,27 @@ static u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset)
return ((ic_clk * (tLOW + tf) + 5000) / 10000) - 1 + offset;
}
static void __i2c_dw_enable(struct dw_i2c_dev *dev, bool enable)
{
int timeout = 100;
do {
dw_writel(dev, enable, DW_IC_ENABLE);
if ((dw_readl(dev, DW_IC_ENABLE_STATUS) & 1) == enable)
return;
/*
* Wait 10 times the signaling period of the highest I2C
* transfer supported by the driver (for 400KHz this is
* 25us) as described in the DesignWare I2C databook.
*/
usleep_range(25, 250);
} while (timeout--);
dev_warn(dev->dev, "timeout in %sabling adapter\n",
enable ? "en" : "dis");
}
/**
* i2c_dw_init() - initialize the designware i2c master hardware
* @dev: device private data
@ -278,7 +300,7 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
}
/* Disable the adapter */
dw_writel(dev, 0, DW_IC_ENABLE);
__i2c_dw_enable(dev, false);
/* set standard and fast speed deviders for high/low periods */
@ -333,7 +355,7 @@ static int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev)
return -ETIMEDOUT;
}
timeout--;
mdelay(1);
usleep_range(1000, 1100);
}
return 0;
@ -345,7 +367,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
u32 ic_con;
/* Disable the adapter */
dw_writel(dev, 0, DW_IC_ENABLE);
__i2c_dw_enable(dev, false);
/* set the slave (target) address */
dw_writel(dev, msgs[dev->msg_write_idx].addr, DW_IC_TAR);
@ -359,7 +381,7 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
dw_writel(dev, ic_con, DW_IC_CON);
/* Enable the adapter */
dw_writel(dev, 1, DW_IC_ENABLE);
__i2c_dw_enable(dev, true);
/* Enable interrupts */
dw_writel(dev, DW_IC_INTR_DEFAULT_MASK, DW_IC_INTR_MASK);
@ -565,7 +587,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
/* no error */
if (likely(!dev->cmd_err)) {
/* Disable the adapter */
dw_writel(dev, 0, DW_IC_ENABLE);
__i2c_dw_enable(dev, false);
ret = num;
goto done;
}
@ -578,7 +600,8 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
ret = -EIO;
done:
pm_runtime_put(dev->dev);
pm_runtime_mark_last_busy(dev->dev);
pm_runtime_put_autosuspend(dev->dev);
mutex_unlock(&dev->lock);
return ret;
@ -700,7 +723,7 @@ EXPORT_SYMBOL_GPL(i2c_dw_isr);
void i2c_dw_enable(struct dw_i2c_dev *dev)
{
/* Enable the adapter */
dw_writel(dev, 1, DW_IC_ENABLE);
__i2c_dw_enable(dev, true);
}
EXPORT_SYMBOL_GPL(i2c_dw_enable);
@ -713,7 +736,7 @@ EXPORT_SYMBOL_GPL(i2c_dw_is_enabled);
void i2c_dw_disable(struct dw_i2c_dev *dev)
{
/* Disable controller */
dw_writel(dev, 0, DW_IC_ENABLE);
__i2c_dw_enable(dev, false);
/* Disable all interupts */
dw_writel(dev, 0, DW_IC_INTR_MASK);

73
drivers/i2c/busses/i2c-designware-pcidrv.c
View File

@ -208,68 +208,45 @@ static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
}
static int i2c_dw_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
const struct pci_device_id *id)
{
struct dw_i2c_dev *dev;
struct i2c_adapter *adap;
unsigned long start, len;
void __iomem *base;
int r;
struct dw_pci_controller *controller;
if (id->driver_data >= ARRAY_SIZE(dw_pci_controllers)) {
printk(KERN_ERR "dw_i2c_pci_probe: invalid driver data %ld\n",
dev_err(&pdev->dev, "%s: invalid driver data %ld\n", __func__,
id->driver_data);
return -EINVAL;
}
controller = &dw_pci_controllers[id->driver_data];
r = pci_enable_device(pdev);
r = pcim_enable_device(pdev);
if (r) {
dev_err(&pdev->dev, "Failed to enable I2C PCI device (%d)\n",
r);
goto exit;
return r;
}
/* Determine the address of the I2C area */
start = pci_resource_start(pdev, 0);
len = pci_resource_len(pdev, 0);
if (!start || len == 0) {
dev_err(&pdev->dev, "base address not set\n");
r = -ENODEV;
goto exit;
}
r = pci_request_region(pdev, 0, DRIVER_NAME);
r = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
if (r) {
dev_err(&pdev->dev, "failed to request I2C region "
"0x%lx-0x%lx\n", start,
(unsigned long)pci_resource_end(pdev, 0));
goto exit;
}
base = ioremap_nocache(start, len);
if (!base) {
dev_err(&pdev->dev, "I/O memory remapping failed\n");
r = -ENOMEM;
goto err_release_region;
return r;
}
dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
if (!dev) {
r = -ENOMEM;
goto err_release_region;
}
dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
init_completion(&dev->cmd_complete);
mutex_init(&dev->lock);
dev->clk = NULL;
dev->controller = controller;
dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
dev->base = base;
dev->dev = get_device(&pdev->dev);
dev->base = pcim_iomap_table(pdev)[0];
dev->dev = &pdev->dev;
dev->functionality =
I2C_FUNC_I2C |
I2C_FUNC_SMBUS_BYTE |
@ -284,7 +261,7 @@ const struct pci_device_id *id)
dev->rx_fifo_depth = controller->rx_fifo_depth;
r = i2c_dw_init(dev);
if (r)
goto err_iounmap;
return r;
adap = &dev->adapter;
i2c_set_adapdata(adap, dev);
@ -296,10 +273,11 @@ const struct pci_device_id *id)
snprintf(adap->name, sizeof(adap->name), "i2c-designware-pci-%d",
adap->nr);
r = request_irq(pdev->irq, i2c_dw_isr, IRQF_SHARED, adap->name, dev);
r = devm_request_irq(&pdev->dev, pdev->irq, i2c_dw_isr, IRQF_SHARED,
adap->name, dev);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
goto err_iounmap;
return r;
}
i2c_dw_disable_int(dev);
@ -307,24 +285,14 @@ const struct pci_device_id *id)
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
goto err_free_irq;
return r;
}
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_allow(&pdev->dev);
return 0;
err_free_irq:
free_irq(pdev->irq, dev);
err_iounmap:
iounmap(dev->base);
put_device(&pdev->dev);
kfree(dev);
err_release_region:
pci_release_region(pdev, 0);
exit:
return r;
}
static void i2c_dw_pci_remove(struct pci_dev *pdev)
@ -336,11 +304,6 @@ static void i2c_dw_pci_remove(struct pci_dev *pdev)
pm_runtime_get_noresume(&pdev->dev);
i2c_del_adapter(&dev->adapter);
put_device(&pdev->dev);
free_irq(dev->irq, dev);
kfree(dev);
pci_release_region(pdev, 0);
}
/* work with hotplug and coldplug */

83
drivers/i2c/busses/i2c-designware-platdrv.c
View File

@ -56,20 +56,11 @@ static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev)
static int dw_i2c_acpi_configure(struct platform_device *pdev)
{
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
struct acpi_device *adev;
int busno, ret;
if (!ACPI_HANDLE(&pdev->dev))
return -ENODEV;
ret = acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev);
if (ret)
return -ENODEV;
dev->adapter.nr = -1;
if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &busno))
dev->adapter.nr = busno;
dev->tx_fifo_depth = 32;
dev->rx_fifo_depth = 32;
return 0;
@ -92,7 +83,7 @@ static int dw_i2c_probe(struct platform_device *pdev)
{
struct dw_i2c_dev *dev;
struct i2c_adapter *adap;
struct resource *mem, *ioarea;
struct resource *mem;
int irq, r;
/* NOTE: driver uses the static register mapping */
@ -108,32 +99,25 @@ static int dw_i2c_probe(struct platform_device *pdev)
return irq; /* -ENXIO */
}
ioarea = request_mem_region(mem->start, resource_size(mem),
pdev->name);
if (!ioarea) {
dev_err(&pdev->dev, "I2C region already claimed\n");
return -EBUSY;
}
dev = devm_kzalloc(&pdev->dev, sizeof(struct dw_i2c_dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev = kzalloc(sizeof(struct dw_i2c_dev), GFP_KERNEL);
if (!dev) {
r = -ENOMEM;
goto err_release_region;
}
dev->base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(dev->base))
return PTR_ERR(dev->base);
init_completion(&dev->cmd_complete);
mutex_init(&dev->lock);
dev->dev = get_device(&pdev->dev);
dev->dev = &pdev->dev;
dev->irq = irq;
platform_set_drvdata(pdev, dev);
dev->clk = clk_get(&pdev->dev, NULL);
dev->clk = devm_clk_get(&pdev->dev, NULL);
dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
if (IS_ERR(dev->clk)) {
r = -ENODEV;
goto err_free_mem;
}
if (IS_ERR(dev->clk))
return PTR_ERR(dev->clk);
clk_prepare_enable(dev->clk);
dev->functionality =
@ -146,13 +130,6 @@ static int dw_i2c_probe(struct platform_device *pdev)
dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE |
DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
dev->base = ioremap(mem->start, resource_size(mem));
if (dev->base == NULL) {
dev_err(&pdev->dev, "failure mapping io resources\n");
r = -EBUSY;
goto err_unuse_clocks;
}
/* Try first if we can configure the device from ACPI */
r = dw_i2c_acpi_configure(pdev);
if (r) {
@ -164,13 +141,14 @@ static int dw_i2c_probe(struct platform_device *pdev)
}
r = i2c_dw_init(dev);
if (r)
goto err_iounmap;
return r;
i2c_dw_disable_int(dev);
r = request_irq(dev->irq, i2c_dw_isr, IRQF_SHARED, pdev->name, dev);
r = devm_request_irq(&pdev->dev, dev->irq, i2c_dw_isr, IRQF_SHARED,
pdev->name, dev);
if (r) {
dev_err(&pdev->dev, "failure requesting irq %i\n", dev->irq);
goto err_iounmap;
return r;
}
adap = &dev->adapter;
@ -186,57 +164,32 @@ static int dw_i2c_probe(struct platform_device *pdev)
r = i2c_add_numbered_adapter(adap);
if (r) {
dev_err(&pdev->dev, "failure adding adapter\n");
goto err_free_irq;
return r;
}
of_i2c_register_devices(adap);
acpi_i2c_register_devices(adap);
pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_put(&pdev->dev);
return 0;
err_free_irq:
free_irq(dev->irq, dev);
err_iounmap:
iounmap(dev->base);
err_unuse_clocks:
clk_disable_unprepare(dev->clk);
clk_put(dev->clk);
dev->clk = NULL;
err_free_mem:
put_device(&pdev->dev);
kfree(dev);
err_release_region:
release_mem_region(mem->start, resource_size(mem));
return r;
}
static int dw_i2c_remove(struct platform_device *pdev)
{
struct dw_i2c_dev *dev = platform_get_drvdata(pdev);
struct resource *mem;
pm_runtime_get_sync(&pdev->dev);
i2c_del_adapter(&dev->adapter);
put_device(&pdev->dev);
clk_disable_unprepare(dev->clk);
clk_put(dev->clk);
dev->clk = NULL;
i2c_dw_disable(dev);
free_irq(dev->irq, dev);
kfree(dev);
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(mem->start, resource_size(mem));
return 0;
}

75
drivers/i2c/busses/i2c-gpio.c
View File

@ -85,23 +85,29 @@ static int i2c_gpio_getscl(void *data)
return gpio_get_value(pdata->scl_pin);
}
static int of_i2c_gpio_probe(struct device_node *np,
struct i2c_gpio_platform_data *pdata)
static int of_i2c_gpio_get_pins(struct device_node *np,
unsigned int *sda_pin, unsigned int *scl_pin)
{
u32 reg;
if (of_gpio_count(np) < 2)
return -ENODEV;
pdata->sda_pin = of_get_gpio(np, 0);
pdata->scl_pin = of_get_gpio(np, 1);
*sda_pin = of_get_gpio(np, 0);
*scl_pin = of_get_gpio(np, 1);
if (!gpio_is_valid(pdata->sda_pin) || !gpio_is_valid(pdata->scl_pin)) {
if (!gpio_is_valid(*sda_pin) || !gpio_is_valid(*scl_pin)) {
pr_err("%s: invalid GPIO pins, sda=%d/scl=%d\n",
np->full_name, pdata->sda_pin, pdata->scl_pin);
np->full_name, *sda_pin, *scl_pin);
return -ENODEV;
}
return 0;
}
static void of_i2c_gpio_get_props(struct device_node *np,
struct i2c_gpio_platform_data *pdata)
{
u32 reg;
of_property_read_u32(np, "i2c-gpio,delay-us", &pdata->udelay);
if (!of_property_read_u32(np, "i2c-gpio,timeout-ms", &reg))
@ -113,8 +119,6 @@ static int of_i2c_gpio_probe(struct device_node *np,
of_property_read_bool(np, "i2c-gpio,scl-open-drain");
pdata->scl_is_output_only =
of_property_read_bool(np, "i2c-gpio,scl-output-only");
return 0;
}
static int i2c_gpio_probe(struct platform_device *pdev)
@ -123,31 +127,52 @@ static int i2c_gpio_probe(struct platform_device *pdev)
struct i2c_gpio_platform_data *pdata;
struct i2c_algo_bit_data *bit_data;
struct i2c_adapter *adap;
unsigned int sda_pin, scl_pin;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
adap = &priv->adap;
bit_data = &priv->bit_data;
pdata = &priv->pdata;
/* First get the GPIO pins; if it fails, we'll defer the probe. */
if (pdev->dev.of_node) {
ret = of_i2c_gpio_probe(pdev->dev.of_node, pdata);
ret = of_i2c_gpio_get_pins(pdev->dev.of_node,
&sda_pin, &scl_pin);
if (ret)
return ret;
} else {
if (!pdev->dev.platform_data)
return -ENXIO;
memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
pdata = pdev->dev.platform_data;
sda_pin = pdata->sda_pin;
scl_pin = pdata->scl_pin;
}
ret = gpio_request(pdata->sda_pin, "sda");
if (ret)
ret = gpio_request(sda_pin, "sda");
if (ret) {
if (ret == -EINVAL)
ret = -EPROBE_DEFER; /* Try again later */
goto err_request_sda;
ret = gpio_request(pdata->scl_pin, "scl");
if (ret)
}
ret = gpio_request(scl_pin, "scl");
if (ret) {
if (ret == -EINVAL)
ret = -EPROBE_DEFER; /* Try again later */
goto err_request_scl;
}
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
goto err_add_bus;
}
adap = &priv->adap;
bit_data = &priv->bit_data;
pdata = &priv->pdata;
if (pdev->dev.of_node) {
pdata->sda_pin = sda_pin;
pdata->scl_pin = scl_pin;
of_i2c_gpio_get_props(pdev->dev.of_node, pdata);
} else {
memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
}
if (pdata->sda_is_open_drain) {
gpio_direction_output(pdata->sda_pin, 1);
@ -211,9 +236,9 @@ static int i2c_gpio_probe(struct platform_device *pdev)
return 0;
err_add_bus:
gpio_free(pdata->scl_pin);
gpio_free(scl_pin);
err_request_scl:
gpio_free(pdata->sda_pin);
gpio_free(sda_pin);
err_request_sda:
return ret;
}

3
drivers/i2c/busses/i2c-intel-mid.c
View File

@ -1082,8 +1082,7 @@ static void intel_mid_i2c_remove(struct pci_dev *dev)
{
struct intel_mid_i2c_private *mrst = pci_get_drvdata(dev);
intel_mid_i2c_disable(&mrst->adap);
if (i2c_del_adapter(&mrst->adap))
dev_err(&dev->dev, "Failed to delete i2c adapter");
i2c_del_adapter(&mrst->adap);
free_irq(dev->irq, mrst);
iounmap(mrst->base);

2
drivers/i2c/busses/i2c-ismt.c
View File

@ -183,7 +183,7 @@ struct ismt_priv {
/**
* ismt_ids - PCI device IDs supported by this driver
*/
static const DEFINE_PCI_DEVICE_TABLE(ismt_ids) = {
static DEFINE_PCI_DEVICE_TABLE(ismt_ids) = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_S1200_SMT0) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_S1200_SMT1) },
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_AVOTON_SMT) },

5
drivers/i2c/busses/i2c-mv64xxx.c
View File

@ -701,9 +701,8 @@ static int
mv64xxx_i2c_remove(struct platform_device *dev)
{
struct mv64xxx_i2c_data *drv_data = platform_get_drvdata(dev);
int rc;
rc = i2c_del_adapter(&drv_data->adapter);
i2c_del_adapter(&drv_data->adapter);
free_irq(drv_data->irq, drv_data);
mv64xxx_i2c_unmap_regs(drv_data);
#if defined(CONFIG_HAVE_CLK)
@ -715,7 +714,7 @@ mv64xxx_i2c_remove(struct platform_device *dev)
#endif
kfree(drv_data);
return rc;
return 0;
}
static const struct of_device_id mv64xxx_i2c_of_match_table[] = {

106
drivers/i2c/busses/i2c-mxs.c
View File

@ -56,6 +56,7 @@
#define MXS_I2C_CTRL1_SET (0x44)
#define MXS_I2C_CTRL1_CLR (0x48)
#define MXS_I2C_CTRL1_CLR_GOT_A_NAK 0x10000000
#define MXS_I2C_CTRL1_BUS_FREE_IRQ 0x80
#define MXS_I2C_CTRL1_DATA_ENGINE_CMPLT_IRQ 0x40
#define MXS_I2C_CTRL1_NO_SLAVE_ACK_IRQ 0x20
@ -65,6 +66,10 @@
#define MXS_I2C_CTRL1_SLAVE_STOP_IRQ 0x02
#define MXS_I2C_CTRL1_SLAVE_IRQ 0x01
#define MXS_I2C_STAT (0x50)
#define MXS_I2C_STAT_BUS_BUSY 0x00000800
#define MXS_I2C_STAT_CLK_GEN_BUSY 0x00000400
#define MXS_I2C_DATA (0xa0)
#define MXS_I2C_DEBUG0 (0xb0)
@ -297,12 +302,10 @@ static int mxs_i2c_pio_wait_dmareq(struct mxs_i2c_dev *i2c)
cond_resched();
}
writel(MXS_I2C_DEBUG0_DMAREQ, i2c->regs + MXS_I2C_DEBUG0_CLR);
return 0;
}
static int mxs_i2c_pio_wait_cplt(struct mxs_i2c_dev *i2c)
static int mxs_i2c_pio_wait_cplt(struct mxs_i2c_dev *i2c, int last)
{
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
@ -323,9 +326,50 @@ static int mxs_i2c_pio_wait_cplt(struct mxs_i2c_dev *i2c)
writel(MXS_I2C_CTRL1_DATA_ENGINE_CMPLT_IRQ,
i2c->regs + MXS_I2C_CTRL1_CLR);
/*
* When ending a transfer with a stop, we have to wait for the bus to
* go idle before we report the transfer as completed. Otherwise the
* start of the next transfer may race with the end of the current one.
*/
while (last && (readl(i2c->regs + MXS_I2C_STAT) &
(MXS_I2C_STAT_BUS_BUSY | MXS_I2C_STAT_CLK_GEN_BUSY))) {
if (time_after(jiffies, timeout))
return -ETIMEDOUT;
cond_resched();
}
return 0;
}
static int mxs_i2c_pio_check_error_state(struct mxs_i2c_dev *i2c)
{
u32 state;
state = readl(i2c->regs + MXS_I2C_CTRL1_CLR) & MXS_I2C_IRQ_MASK;
if (state & MXS_I2C_CTRL1_NO_SLAVE_ACK_IRQ)
i2c->cmd_err = -ENXIO;
else if (state & (MXS_I2C_CTRL1_EARLY_TERM_IRQ |
MXS_I2C_CTRL1_MASTER_LOSS_IRQ |
MXS_I2C_CTRL1_SLAVE_STOP_IRQ |
MXS_I2C_CTRL1_SLAVE_IRQ))
i2c->cmd_err = -EIO;
return i2c->cmd_err;
}
static void mxs_i2c_pio_trigger_cmd(struct mxs_i2c_dev *i2c, u32 cmd)
{
u32 reg;
writel(cmd, i2c->regs + MXS_I2C_CTRL0);
/* readback makes sure the write is latched into hardware */
reg = readl(i2c->regs + MXS_I2C_CTRL0);
reg |= MXS_I2C_CTRL0_RUN;
writel(reg, i2c->regs + MXS_I2C_CTRL0);
}
static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
struct i2c_msg *msg, uint32_t flags)
{
@ -341,23 +385,26 @@ static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
addr_data |= I2C_SMBUS_READ;
/* SELECT command. */
writel(MXS_I2C_CTRL0_RUN | MXS_CMD_I2C_SELECT,
i2c->regs + MXS_I2C_CTRL0);
mxs_i2c_pio_trigger_cmd(i2c, MXS_CMD_I2C_SELECT);
ret = mxs_i2c_pio_wait_dmareq(i2c);
if (ret)
return ret;
writel(addr_data, i2c->regs + MXS_I2C_DATA);
writel(MXS_I2C_DEBUG0_DMAREQ, i2c->regs + MXS_I2C_DEBUG0_CLR);
ret = mxs_i2c_pio_wait_cplt(i2c);
ret = mxs_i2c_pio_wait_cplt(i2c, 0);
if (ret)
return ret;
if (mxs_i2c_pio_check_error_state(i2c))
goto cleanup;
/* READ command. */
writel(MXS_I2C_CTRL0_RUN | MXS_CMD_I2C_READ | flags |
MXS_I2C_CTRL0_XFER_COUNT(msg->len),
i2c->regs + MXS_I2C_CTRL0);
mxs_i2c_pio_trigger_cmd(i2c,
MXS_CMD_I2C_READ | flags |
MXS_I2C_CTRL0_XFER_COUNT(msg->len));
for (i = 0; i < msg->len; i++) {
if ((i & 3) == 0) {
@ -365,6 +412,8 @@ static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
if (ret)
return ret;
data = readl(i2c->regs + MXS_I2C_DATA);
writel(MXS_I2C_DEBUG0_DMAREQ,
i2c->regs + MXS_I2C_DEBUG0_CLR);
}
msg->buf[i] = data & 0xff;
data >>= 8;
@ -373,9 +422,9 @@ static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
addr_data |= I2C_SMBUS_WRITE;
/* WRITE command. */
writel(MXS_I2C_CTRL0_RUN | MXS_CMD_I2C_WRITE | flags |
MXS_I2C_CTRL0_XFER_COUNT(msg->len + 1),
i2c->regs + MXS_I2C_CTRL0);
mxs_i2c_pio_trigger_cmd(i2c,
MXS_CMD_I2C_WRITE | flags |
MXS_I2C_CTRL0_XFER_COUNT(msg->len + 1));
/*
* The LSB of data buffer is the first byte blasted across
@ -391,6 +440,8 @@ static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
if (ret)
return ret;
writel(data, i2c->regs + MXS_I2C_DATA);
writel(MXS_I2C_DEBUG0_DMAREQ,
i2c->regs + MXS_I2C_DEBUG0_CLR);
}
}
@ -401,13 +452,19 @@ static int mxs_i2c_pio_setup_xfer(struct i2c_adapter *adap,
if (ret)
return ret;
writel(data, i2c->regs + MXS_I2C_DATA);
writel(MXS_I2C_DEBUG0_DMAREQ,
i2c->regs + MXS_I2C_DEBUG0_CLR);
}
}
ret = mxs_i2c_pio_wait_cplt(i2c);
ret = mxs_i2c_pio_wait_cplt(i2c, flags & MXS_I2C_CTRL0_POST_SEND_STOP);
if (ret)
return ret;
/* make sure we capture any occurred error into cmd_err */
mxs_i2c_pio_check_error_state(i2c);
cleanup:
/* Clear any dangling IRQs and re-enable interrupts. */
writel(MXS_I2C_IRQ_MASK, i2c->regs + MXS_I2C_CTRL1_CLR);
writel(MXS_I2C_IRQ_MASK << 8, i2c->regs + MXS_I2C_CTRL1_SET);
@ -439,12 +496,12 @@ static int mxs_i2c_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg,
* using PIO mode while longer transfers use DMA. The 8 byte border is
* based on this empirical measurement and a lot of previous frobbing.
*/
i2c->cmd_err = 0;
if (msg->len < 8) {
ret = mxs_i2c_pio_setup_xfer(adap, msg, flags);
if (ret)
mxs_i2c_reset(i2c);
} else {
i2c->cmd_err = 0;
INIT_COMPLETION(i2c->cmd_complete);
ret = mxs_i2c_dma_setup_xfer(adap, msg, flags);
if (ret)
@ -454,13 +511,19 @@ static int mxs_i2c_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg,
msecs_to_jiffies(1000));
if (ret == 0)
goto timeout;
if (i2c->cmd_err == -ENXIO)
mxs_i2c_reset(i2c);
ret = i2c->cmd_err;
}
if (i2c->cmd_err == -ENXIO) {
/*
* If the transfer fails with a NAK from the slave the
* controller halts until it gets told to return to idle state.
*/
writel(MXS_I2C_CTRL1_CLR_GOT_A_NAK,
i2c->regs + MXS_I2C_CTRL1_SET);
}
ret = i2c->cmd_err;
dev_dbg(i2c->dev, "Done with err=%d\n", ret);
return ret;
@ -686,11 +749,8 @@ static int mxs_i2c_probe(struct platform_device *pdev)
static int mxs_i2c_remove(struct platform_device *pdev)
{
struct mxs_i2c_dev *i2c = platform_get_drvdata(pdev);
int ret;
ret = i2c_del_adapter(&i2c->adapter);
if (ret)
return -EBUSY;
i2c_del_adapter(&i2c->adapter);
if (i2c->dmach)
dma_release_channel(i2c->dmach);

6
drivers/i2c/busses/i2c-nforce2-s4985.c
View File

@ -164,11 +164,7 @@ static int __init nforce2_s4985_init(void)
}
/* Unregister physical bus */
error = i2c_del_adapter(nforce2_smbus);
if (error) {
dev_err(&nforce2_smbus->dev, "Physical bus removal failed\n");
goto ERROR0;
}
i2c_del_adapter(nforce2_smbus);
printk(KERN_INFO "Enabling SMBus multiplexing for Tyan S4985\n");
/* Define the 5 virtual adapters and algorithms structures */

10
drivers/i2c/busses/i2c-octeon.c
View File

@ -183,7 +183,7 @@ static irqreturn_t octeon_i2c_isr(int irq, void *dev_id)
struct octeon_i2c *i2c = dev_id;
octeon_i2c_int_disable(i2c);
wake_up_interruptible(&i2c->queue);
wake_up(&i2c->queue);
return IRQ_HANDLED;
}
@ -206,9 +206,9 @@ static int octeon_i2c_wait(struct octeon_i2c *i2c)
octeon_i2c_int_enable(i2c);
result = wait_event_interruptible_timeout(i2c->queue,
octeon_i2c_test_iflg(i2c),
i2c->adap.timeout);
result = wait_event_timeout(i2c->queue,
octeon_i2c_test_iflg(i2c),
i2c->adap.timeout);
octeon_i2c_int_disable(i2c);
@ -440,7 +440,7 @@ static struct i2c_adapter octeon_i2c_ops = {
.owner = THIS_MODULE,
.name = "OCTEON adapter",
.algo = &octeon_i2c_algo,
.timeout = 2,
.timeout = HZ / 50,
};
/**

8
drivers/i2c/busses/i2c-powermac.c
View File

@ -213,14 +213,8 @@ static const struct i2c_algorithm i2c_powermac_algorithm = {
static int i2c_powermac_remove(struct platform_device *dev)
{
struct i2c_adapter *adapter = platform_get_drvdata(dev);
int rc;
rc = i2c_del_adapter(adapter);
/* We aren't that prepared to deal with this... */
if (rc)
printk(KERN_WARNING
"i2c-powermac.c: Failed to remove bus %s !\n",
adapter->name);
i2c_del_adapter(adapter);
memset(adapter, 0, sizeof(*adapter));
return 0;

10
drivers/i2c/busses/i2c-puv3.c
View File

@ -234,21 +234,15 @@ static int puv3_i2c_remove(struct platform_device *pdev)
{
struct i2c_adapter *adapter = platform_get_drvdata(pdev);
struct resource *mem;
int rc;
rc = i2c_del_adapter(adapter);
if (rc) {
dev_err(&pdev->dev, "Adapter '%s' delete fail\n",
adapter->name);
return rc;
}
i2c_del_adapter(adapter);
put_device(&pdev->dev);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(mem->start, resource_size(mem));
return rc;
return 0;
}
#ifdef CONFIG_PM

20
drivers/i2c/busses/i2c-pxa.c
View File

@ -1053,16 +1053,13 @@ static int i2c_pxa_probe_dt(struct platform_device *pdev, struct pxa_i2c *i2c,
struct device_node *np = pdev->dev.of_node;
const struct of_device_id *of_id =
of_match_device(i2c_pxa_dt_ids, &pdev->dev);
int ret;
if (!of_id)
return 1;
ret = of_alias_get_id(np, "i2c");
if (ret < 0) {
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret);
return ret;
}
pdev->id = ret;
/* For device tree we always use the dynamic or alias-assigned ID */
i2c->adap.nr = -1;
if (of_get_property(np, "mrvl,i2c-polling", NULL))
i2c->use_pio = 1;
if (of_get_property(np, "mrvl,i2c-fast-mode", NULL))
@ -1100,6 +1097,9 @@ static int i2c_pxa_probe(struct platform_device *dev)
goto emalloc;
}
/* Default adapter num to device id; i2c_pxa_probe_dt can override. */
i2c->adap.nr = dev->id;
ret = i2c_pxa_probe_dt(dev, i2c, &i2c_type);
if (ret > 0)
ret = i2c_pxa_probe_pdata(dev, i2c, &i2c_type);
@ -1124,9 +1124,7 @@ static int i2c_pxa_probe(struct platform_device *dev)
spin_lock_init(&i2c->lock);
init_waitqueue_head(&i2c->wait);
i2c->adap.nr = dev->id;
snprintf(i2c->adap.name, sizeof(i2c->adap.name), "pxa_i2c-i2c.%u",
i2c->adap.nr);
strlcpy(i2c->adap.name, "pxa_i2c-i2c", sizeof(i2c->adap.name));
i2c->clk = clk_get(&dev->dev, NULL);
if (IS_ERR(i2c->clk)) {
@ -1169,7 +1167,7 @@ static int i2c_pxa_probe(struct platform_device *dev)
} else {
i2c->adap.algo = &i2c_pxa_algorithm;
ret = request_irq(irq, i2c_pxa_handler, IRQF_SHARED,
i2c->adap.name, i2c);
dev_name(&dev->dev), i2c);
if (ret)
goto ereqirq;
}

48
drivers/i2c/busses/i2c-s3c2410.c
View File

@ -42,9 +42,46 @@
#include <asm/irq.h>
#include <plat/regs-iic.h>
#include <linux/platform_data/i2c-s3c2410.h>
/* see s3c2410x user guide, v1.1, section 9 (p447) for more info */
#define S3C2410_IICCON 0x00
#define S3C2410_IICSTAT 0x04
#define S3C2410_IICADD 0x08
#define S3C2410_IICDS 0x0C
#define S3C2440_IICLC 0x10
#define S3C2410_IICCON_ACKEN (1 << 7)
#define S3C2410_IICCON_TXDIV_16 (0 << 6)
#define S3C2410_IICCON_TXDIV_512 (1 << 6)
#define S3C2410_IICCON_IRQEN (1 << 5)
#define S3C2410_IICCON_IRQPEND (1 << 4)
#define S3C2410_IICCON_SCALE(x) ((x) & 0xf)
#define S3C2410_IICCON_SCALEMASK (0xf)
#define S3C2410_IICSTAT_MASTER_RX (2 << 6)
#define S3C2410_IICSTAT_MASTER_TX (3 << 6)
#define S3C2410_IICSTAT_SLAVE_RX (0 << 6)
#define S3C2410_IICSTAT_SLAVE_TX (1 << 6)
#define S3C2410_IICSTAT_MODEMASK (3 << 6)
#define S3C2410_IICSTAT_START (1 << 5)
#define S3C2410_IICSTAT_BUSBUSY (1 << 5)
#define S3C2410_IICSTAT_TXRXEN (1 << 4)
#define S3C2410_IICSTAT_ARBITR (1 << 3)
#define S3C2410_IICSTAT_ASSLAVE (1 << 2)
#define S3C2410_IICSTAT_ADDR0 (1 << 1)
#define S3C2410_IICSTAT_LASTBIT (1 << 0)
#define S3C2410_IICLC_SDA_DELAY0 (0 << 0)
#define S3C2410_IICLC_SDA_DELAY5 (1 << 0)
#define S3C2410_IICLC_SDA_DELAY10 (2 << 0)
#define S3C2410_IICLC_SDA_DELAY15 (3 << 0)
#define S3C2410_IICLC_SDA_DELAY_MASK (3 << 0)
#define S3C2410_IICLC_FILTER_ON (1 << 2)
/* Treat S3C2410 as baseline hardware, anything else is supported via quirks */
#define QUIRK_S3C2440 (1 << 0)
#define QUIRK_HDMIPHY (1 << 1)
@ -309,6 +346,12 @@ static inline int is_lastmsg(struct s3c24xx_i2c *i2c)
static inline int is_msglast(struct s3c24xx_i2c *i2c)
{
/* msg->len is always 1 for the first byte of smbus block read.
* Actual length will be read from slave. More bytes will be
* read according to the length then. */
if (i2c->msg->flags & I2C_M_RECV_LEN && i2c->msg->len == 1)
return 0;
return i2c->msg_ptr == i2c->msg->len-1;
}
@ -448,6 +491,9 @@ static int i2c_s3c_irq_nextbyte(struct s3c24xx_i2c *i2c, unsigned long iicstat)
byte = readb(i2c->regs + S3C2410_IICDS);
i2c->msg->buf[i2c->msg_ptr++] = byte;
/* Add actual length to read for smbus block read */
if (i2c->msg->flags & I2C_M_RECV_LEN && i2c->msg->len == 1)
i2c->msg->len += byte;
prepare_read:
if (is_msglast(i2c)) {
/* last byte of buffer */

26
drivers/i2c/busses/i2c-tegra.c
View File

@ -25,7 +25,6 @@
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/i2c-tegra.h>
#include <linux/of_i2c.h>
#include <linux/of_device.h>
#include <linux/module.h>
@ -172,7 +171,7 @@ struct tegra_i2c_dev {
u8 *msg_buf;
size_t msg_buf_remaining;
int msg_read;
unsigned long bus_clk_rate;
u32 bus_clk_rate;
bool is_suspended;
};
@ -694,7 +693,6 @@ static const struct tegra_i2c_hw_feature tegra114_i2c_hw = {
.clk_divisor_std_fast_mode = 0x19,
};
#if defined(CONFIG_OF)
/* Match table for of_platform binding */
static const struct of_device_id tegra_i2c_of_match[] = {
{ .compatible = "nvidia,tegra114-i2c", .data = &tegra114_i2c_hw, },
@ -704,16 +702,13 @@ static const struct of_device_id tegra_i2c_of_match[] = {
{},
};
MODULE_DEVICE_TABLE(of, tegra_i2c_of_match);
#endif
static int tegra_i2c_probe(struct platform_device *pdev)
{
struct tegra_i2c_dev *i2c_dev;
struct tegra_i2c_platform_data *pdata = pdev->dev.platform_data;
struct resource *res;
struct clk *div_clk;
struct clk *fast_clk;
const unsigned int *prop;
void __iomem *base;
int irq;
int ret = 0;
@ -754,23 +749,16 @@ static int tegra_i2c_probe(struct platform_device *pdev)
i2c_dev->cont_id = pdev->id;
i2c_dev->dev = &pdev->dev;
i2c_dev->bus_clk_rate = 100000; /* default clock rate */
if (pdata) {
i2c_dev->bus_clk_rate = pdata->bus_clk_rate;
} else if (i2c_dev->dev->of_node) { /* if there is a device tree node ... */
prop = of_get_property(i2c_dev->dev->of_node,
"clock-frequency", NULL);
if (prop)
i2c_dev->bus_clk_rate = be32_to_cpup(prop);
}
ret = of_property_read_u32(i2c_dev->dev->of_node, "clock-frequency",
&i2c_dev->bus_clk_rate);
if (ret)
i2c_dev->bus_clk_rate = 100000; /* default clock rate */
i2c_dev->hw = &tegra20_i2c_hw;
if (pdev->dev.of_node) {
const struct of_device_id *match;
match = of_match_device(of_match_ptr(tegra_i2c_of_match),
&pdev->dev);
match = of_match_device(tegra_i2c_of_match, &pdev->dev);
i2c_dev->hw = match->data;
i2c_dev->is_dvc = of_device_is_compatible(pdev->dev.of_node,
"nvidia,tegra20-i2c-dvc");
@ -876,7 +864,7 @@ static struct platform_driver tegra_i2c_driver = {
.driver = {
.name = "tegra-i2c",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(tegra_i2c_of_match),
.of_match_table = tegra_i2c_of_match,
.pm = TEGRA_I2C_PM,
},
};

5
drivers/i2c/busses/i2c-viperboard.c
View File

@ -421,11 +421,10 @@ error:
static int vprbrd_i2c_remove(struct platform_device *pdev)
{
struct vprbrd_i2c *vb_i2c = platform_get_drvdata(pdev);
int ret;
ret = i2c_del_adapter(&vb_i2c->i2c);
i2c_del_adapter(&vb_i2c->i2c);
return ret;
return 0;
}
static struct platform_driver vprbrd_i2c_driver = {

6
drivers/i2c/busses/i2c-xiic.c
View File

@ -312,10 +312,8 @@ static void xiic_fill_tx_fifo(struct xiic_i2c *i2c)
/* last message in transfer -> STOP */
data |= XIIC_TX_DYN_STOP_MASK;
dev_dbg(i2c->adap.dev.parent, "%s TX STOP\n", __func__);
xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, data);
} else
xiic_setreg8(i2c, XIIC_DTR_REG_OFFSET, data);
}
xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, data);
}
}

246
drivers/i2c/i2c-core.c
View File

@ -27,7 +27,9 @@
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/init.h>
@ -47,7 +49,7 @@
/* core_lock protects i2c_adapter_idr, and guarantees
that device detection, deletion of detected devices, and attach_adapter
and detach_adapter calls are serialized */
calls are serialized */
static DEFINE_MUTEX(core_lock);
static DEFINE_IDR(i2c_adapter_idr);
@ -91,7 +93,6 @@ static int i2c_device_match(struct device *dev, struct device_driver *drv)
return 0;
}
#ifdef CONFIG_HOTPLUG
/* uevent helps with hotplug: modprobe -q $(MODALIAS) */
static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
@ -105,9 +106,129 @@ static int i2c_device_uevent(struct device *dev, struct kobj_uevent_env *env)
return 0;
}
#else
#define i2c_device_uevent NULL
#endif /* CONFIG_HOTPLUG */
/* i2c bus recovery routines */
static int get_scl_gpio_value(struct i2c_adapter *adap)
{
return gpio_get_value(adap->bus_recovery_info->scl_gpio);
}
static void set_scl_gpio_value(struct i2c_adapter *adap, int val)
{
gpio_set_value(adap->bus_recovery_info->scl_gpio, val);
}
static int get_sda_gpio_value(struct i2c_adapter *adap)
{
return gpio_get_value(adap->bus_recovery_info->sda_gpio);
}
static int i2c_get_gpios_for_recovery(struct i2c_adapter *adap)
{
struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
struct device *dev = &adap->dev;
int ret = 0;
ret = gpio_request_one(bri->scl_gpio, GPIOF_OPEN_DRAIN |
GPIOF_OUT_INIT_HIGH, "i2c-scl");
if (ret) {
dev_warn(dev, "Can't get SCL gpio: %d\n", bri->scl_gpio);
return ret;
}
if (bri->get_sda) {
if (gpio_request_one(bri->sda_gpio, GPIOF_IN, "i2c-sda")) {
/* work without SDA polling */
dev_warn(dev, "Can't get SDA gpio: %d. Not using SDA polling\n",
bri->sda_gpio);
bri->get_sda = NULL;
}
}
return ret;
}
static void i2c_put_gpios_for_recovery(struct i2c_adapter *adap)
{
struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
if (bri->get_sda)
gpio_free(bri->sda_gpio);
gpio_free(bri->scl_gpio);
}
/*
* We are generating clock pulses. ndelay() determines durating of clk pulses.
* We will generate clock with rate 100 KHz and so duration of both clock levels
* is: delay in ns = (10^6 / 100) / 2
*/
#define RECOVERY_NDELAY 5000
#define RECOVERY_CLK_CNT 9
static int i2c_generic_recovery(struct i2c_adapter *adap)
{
struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
int i = 0, val = 1, ret = 0;
if (bri->prepare_recovery)
bri->prepare_recovery(bri);
/*
* By this time SCL is high, as we need to give 9 falling-rising edges
*/
while (i++ < RECOVERY_CLK_CNT * 2) {
if (val) {
/* Break if SDA is high */
if (bri->get_sda && bri->get_sda(adap))
break;
/* SCL shouldn't be low here */
if (!bri->get_scl(adap)) {
dev_err(&adap->dev,
"SCL is stuck low, exit recovery\n");
ret = -EBUSY;
break;
}
}
val = !val;
bri->set_scl(adap, val);
ndelay(RECOVERY_NDELAY);
}
if (bri->unprepare_recovery)
bri->unprepare_recovery(bri);
return ret;
}
int i2c_generic_scl_recovery(struct i2c_adapter *adap)
{
adap->bus_recovery_info->set_scl(adap, 1);
return i2c_generic_recovery(adap);
}
int i2c_generic_gpio_recovery(struct i2c_adapter *adap)
{
int ret;
ret = i2c_get_gpios_for_recovery(adap);
if (ret)
return ret;
ret = i2c_generic_recovery(adap);
i2c_put_gpios_for_recovery(adap);
return ret;
}
int i2c_recover_bus(struct i2c_adapter *adap)
{
if (!adap->bus_recovery_info)
return -EOPNOTSUPP;
dev_dbg(&adap->dev, "Trying i2c bus recovery\n");
return adap->bus_recovery_info->recover_bus(adap);
}
static int i2c_device_probe(struct device *dev)
{
@ -902,6 +1023,39 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
"Failed to create compatibility class link\n");
#endif
/* bus recovery specific initialization */
if (adap->bus_recovery_info) {
struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
if (!bri->recover_bus) {
dev_err(&adap->dev, "No recover_bus() found, not using recovery\n");
adap->bus_recovery_info = NULL;
goto exit_recovery;
}
/* Generic GPIO recovery */
if (bri->recover_bus == i2c_generic_gpio_recovery) {
if (!gpio_is_valid(bri->scl_gpio)) {
dev_err(&adap->dev, "Invalid SCL gpio, not using recovery\n");
adap->bus_recovery_info = NULL;
goto exit_recovery;
}
if (gpio_is_valid(bri->sda_gpio))
bri->get_sda = get_sda_gpio_value;
else
bri->get_sda = NULL;
bri->get_scl = get_scl_gpio_value;
bri->set_scl = set_scl_gpio_value;
} else if (!bri->set_scl || !bri->get_scl) {
/* Generic SCL recovery */
dev_err(&adap->dev, "No {get|set}_gpio() found, not using recovery\n");
adap->bus_recovery_info = NULL;
}
}
exit_recovery:
/* create pre-declared device nodes */
if (adap->nr < __i2c_first_dynamic_bus_num)
i2c_scan_static_board_info(adap);
@ -920,14 +1074,36 @@ out_list:
return res;
}
/**
* __i2c_add_numbered_adapter - i2c_add_numbered_adapter where nr is never -1
* @adap: the adapter to register (with adap->nr initialized)
* Context: can sleep
*
* See i2c_add_numbered_adapter() for details.
*/
static int __i2c_add_numbered_adapter(struct i2c_adapter *adap)
{
int id;
mutex_lock(&core_lock);
id = idr_alloc(&i2c_adapter_idr, adap, adap->nr, adap->nr + 1,
GFP_KERNEL);
mutex_unlock(&core_lock);
if (id < 0)
return id == -ENOSPC ? -EBUSY : id;
return i2c_register_adapter(adap);
}
/**
* i2c_add_adapter - declare i2c adapter, use dynamic bus number
* @adapter: the adapter to add
* Context: can sleep
*
* This routine is used to declare an I2C adapter when its bus number
* doesn't matter. Examples: for I2C adapters dynamically added by
* USB links or PCI plugin cards.
* doesn't matter or when its bus number is specified by an dt alias.
* Examples of bases when the bus number doesn't matter: I2C adapters
* dynamically added by USB links or PCI plugin cards.
*
* When this returns zero, a new bus number was allocated and stored
* in adap->nr, and the specified adapter became available for clients.
@ -935,8 +1111,17 @@ out_list:
*/
int i2c_add_adapter(struct i2c_adapter *adapter)
{
struct device *dev = &adapter->dev;
int id;
if (dev->of_node) {
id = of_alias_get_id(dev->of_node, "i2c");
if (id >= 0) {
adapter->nr = id;
return __i2c_add_numbered_adapter(adapter);
}
}
mutex_lock(&core_lock);
id = idr_alloc(&i2c_adapter_idr, adapter,
__i2c_first_dynamic_bus_num, 0, GFP_KERNEL);
@ -975,26 +1160,17 @@ EXPORT_SYMBOL(i2c_add_adapter);
*/
int i2c_add_numbered_adapter(struct i2c_adapter *adap)
{
int id;
if (adap->nr == -1) /* -1 means dynamically assign bus id */
return i2c_add_adapter(adap);
mutex_lock(&core_lock);
id = idr_alloc(&i2c_adapter_idr, adap, adap->nr, adap->nr + 1,
GFP_KERNEL);
mutex_unlock(&core_lock);
if (id < 0)
return id == -ENOSPC ? -EBUSY : id;
return i2c_register_adapter(adap);
return __i2c_add_numbered_adapter(adap);
}
EXPORT_SYMBOL_GPL(i2c_add_numbered_adapter);
static int i2c_do_del_adapter(struct i2c_driver *driver,
static void i2c_do_del_adapter(struct i2c_driver *driver,
struct i2c_adapter *adapter)
{
struct i2c_client *client, *_n;
int res;
/* Remove the devices we created ourselves as the result of hardware
* probing (using a driver's detect method) */
@ -1006,16 +1182,6 @@ static int i2c_do_del_adapter(struct i2c_driver *driver,
i2c_unregister_device(client);
}
}
if (!driver->detach_adapter)
return 0;
dev_warn(&adapter->dev, "%s: detach_adapter method is deprecated\n",
driver->driver.name);
res = driver->detach_adapter(adapter);
if (res)
dev_err(&adapter->dev, "detach_adapter failed (%d) "
"for driver [%s]\n", res, driver->driver.name);
return res;
}
static int __unregister_client(struct device *dev, void *dummy)
@ -1036,7 +1202,8 @@ static int __unregister_dummy(struct device *dev, void *dummy)
static int __process_removed_adapter(struct device_driver *d, void *data)
{
return i2c_do_del_adapter(to_i2c_driver(d), data);
i2c_do_del_adapter(to_i2c_driver(d), data);
return 0;
}
/**
@ -1047,9 +1214,8 @@ static int __process_removed_adapter(struct device_driver *d, void *data)
* This unregisters an I2C adapter which was previously registered
* by @i2c_add_adapter or @i2c_add_numbered_adapter.
*/
int i2c_del_adapter(struct i2c_adapter *adap)
void i2c_del_adapter(struct i2c_adapter *adap)
{
int res = 0;
struct i2c_adapter *found;
struct i2c_client *client, *next;
@ -1060,16 +1226,14 @@ int i2c_del_adapter(struct i2c_adapter *adap)
if (found != adap) {
pr_debug("i2c-core: attempting to delete unregistered "
"adapter [%s]\n", adap->name);
return -EINVAL;
return;
}
/* Tell drivers about this removal */
mutex_lock(&core_lock);
res = bus_for_each_drv(&i2c_bus_type, NULL, adap,
bus_for_each_drv(&i2c_bus_type, NULL, adap,
__process_removed_adapter);
mutex_unlock(&core_lock);
if (res)
return res;
/* Remove devices instantiated from sysfs */
mutex_lock_nested(&adap->userspace_clients_lock,
@ -1088,8 +1252,8 @@ int i2c_del_adapter(struct i2c_adapter *adap)
* we can't remove the dummy devices during the first pass: they
* could have been instantiated by real devices wishing to clean
* them up properly, so we give them a chance to do that first. */
res = device_for_each_child(&adap->dev, NULL, __unregister_client);
res = device_for_each_child(&adap->dev, NULL, __unregister_dummy);
device_for_each_child(&adap->dev, NULL, __unregister_client);
device_for_each_child(&adap->dev, NULL, __unregister_dummy);
#ifdef CONFIG_I2C_COMPAT
class_compat_remove_link(i2c_adapter_compat_class, &adap->dev,
@ -1114,8 +1278,6 @@ int i2c_del_adapter(struct i2c_adapter *adap)
/* Clear the device structure in case this adapter is ever going to be
added again */
memset(&adap->dev, 0, sizeof(adap->dev));
return 0;
}
EXPORT_SYMBOL(i2c_del_adapter);
@ -1185,9 +1347,9 @@ EXPORT_SYMBOL(i2c_register_driver);
static int __process_removed_driver(struct device *dev, void *data)
{
if (dev->type != &i2c_adapter_type)
return 0;
return i2c_do_del_adapter(data, to_i2c_adapter(dev));
if (dev->type == &i2c_adapter_type)
i2c_do_del_adapter(data, to_i2c_adapter(dev));
return 0;
}
/**

9
drivers/i2c/i2c-mux.c
View File

@ -191,17 +191,12 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
}
EXPORT_SYMBOL_GPL(i2c_add_mux_adapter);
int i2c_del_mux_adapter(struct i2c_adapter *adap)
void i2c_del_mux_adapter(struct i2c_adapter *adap)
{
struct i2c_mux_priv *priv = adap->algo_data;
int ret;
ret = i2c_del_adapter(adap);
if (ret < 0)
return ret;
i2c_del_adapter(adap);
kfree(priv);
return 0;
}
EXPORT_SYMBOL_GPL(i2c_del_mux_adapter);

12
drivers/i2c/muxes/Kconfig
View File

@ -5,6 +5,18 @@
menu "Multiplexer I2C Chip support"
depends on I2C_MUX
config I2C_ARB_GPIO_CHALLENGE
tristate "GPIO-based I2C arbitration"
depends on GENERIC_GPIO && OF
help
If you say yes to this option, support will be included for an
I2C multimaster arbitration scheme using GPIOs and a challenge &
response mechanism where masters have to claim the bus by asserting
a GPIO.
This driver can also be built as a module. If so, the module
will be called i2c-arb-gpio-challenge.
config I2C_MUX_GPIO
tristate "GPIO-based I2C multiplexer"
depends on GENERIC_GPIO

2
drivers/i2c/muxes/Makefile
View File

@ -1,6 +1,8 @@
#
# Makefile for multiplexer I2C chip drivers.
obj-$(CONFIG_I2C_ARB_GPIO_CHALLENGE) += i2c-arb-gpio-challenge.o
obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o
obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o
obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o

251
drivers/i2c/muxes/i2c-arb-gpio-challenge.c Normal file
View File

@ -0,0 +1,251 @@
/*
* GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
*
* Copyright (C) 2012 Google, Inc
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of_i2c.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
/**
* struct i2c_arbitrator_data - Driver data for I2C arbitrator
*
* @parent: Parent adapter
* @child: Child bus
* @our_gpio: GPIO we'll use to claim.
* @our_gpio_release: 0 if active high; 1 if active low; AKA if the GPIO ==
* this then consider it released.
* @their_gpio: GPIO that the other side will use to claim.
* @their_gpio_release: 0 if active high; 1 if active low; AKA if the GPIO ==
* this then consider it released.
* @slew_delay_us: microseconds to wait for a GPIO to go high.
* @wait_retry_us: we'll attempt another claim after this many microseconds.
* @wait_free_us: we'll give up after this many microseconds.
*/
struct i2c_arbitrator_data {
struct i2c_adapter *parent;
struct i2c_adapter *child;
int our_gpio;
int our_gpio_release;
int their_gpio;
int their_gpio_release;
unsigned int slew_delay_us;
unsigned int wait_retry_us;
unsigned int wait_free_us;
};
/**
* i2c_arbitrator_select - claim the I2C bus
*
* Use the GPIO-based signalling protocol; return -EBUSY if we fail.
*/
static int i2c_arbitrator_select(struct i2c_adapter *adap, void *data, u32 chan)
{
const struct i2c_arbitrator_data *arb = data;
unsigned long stop_retry, stop_time;
/* Start a round of trying to claim the bus */
stop_time = jiffies + usecs_to_jiffies(arb->wait_free_us) + 1;
do {
/* Indicate that we want to claim the bus */
gpio_set_value(arb->our_gpio, !arb->our_gpio_release);
udelay(arb->slew_delay_us);
/* Wait for the other master to release it */
stop_retry = jiffies + usecs_to_jiffies(arb->wait_retry_us) + 1;
while (time_before(jiffies, stop_retry)) {
int gpio_val = !!gpio_get_value(arb->their_gpio);
if (gpio_val == arb->their_gpio_release) {
/* We got it, so return */
return 0;
}
usleep_range(50, 200);
}
/* It didn't release, so give up, wait, and try again */
gpio_set_value(arb->our_gpio, arb->our_gpio_release);
usleep_range(arb->wait_retry_us, arb->wait_retry_us * 2);
} while (time_before(jiffies, stop_time));
/* Give up, release our claim */
gpio_set_value(arb->our_gpio, arb->our_gpio_release);
udelay(arb->slew_delay_us);
dev_err(&adap->dev, "Could not claim bus, timeout\n");
return -EBUSY;
}
/**
* i2c_arbitrator_deselect - release the I2C bus
*
* Release the I2C bus using the GPIO-based signalling protocol.
*/
static int i2c_arbitrator_deselect(struct i2c_adapter *adap, void *data,
u32 chan)
{
const struct i2c_arbitrator_data *arb = data;
/* Release the bus and wait for the other master to notice */
gpio_set_value(arb->our_gpio, arb->our_gpio_release);
udelay(arb->slew_delay_us);
return 0;
}
static int i2c_arbitrator_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct device_node *parent_np;
struct i2c_arbitrator_data *arb;
enum of_gpio_flags gpio_flags;
unsigned long out_init;
int ret;
/* We only support probing from device tree; no platform_data */
if (!np) {
dev_err(dev, "Cannot find device tree node\n");
return -ENODEV;
}
if (dev->platform_data) {
dev_err(dev, "Platform data is not supported\n");
return -EINVAL;
}
arb = devm_kzalloc(dev, sizeof(*arb), GFP_KERNEL);
if (!arb) {
dev_err(dev, "Cannot allocate i2c_arbitrator_data\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, arb);
/* Request GPIOs */
ret = of_get_named_gpio_flags(np, "our-claim-gpio", 0, &gpio_flags);
if (!gpio_is_valid(ret)) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "Error getting our-claim-gpio\n");
return ret;
}
arb->our_gpio = ret;
arb->our_gpio_release = !!(gpio_flags & OF_GPIO_ACTIVE_LOW);
out_init = (gpio_flags & OF_GPIO_ACTIVE_LOW) ?
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
ret = devm_gpio_request_one(dev, arb->our_gpio, out_init,
"our-claim-gpio");
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "Error requesting our-claim-gpio\n");
return ret;
}
ret = of_get_named_gpio_flags(np, "their-claim-gpios", 0, &gpio_flags);
if (!gpio_is_valid(ret)) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "Error getting their-claim-gpio\n");
return ret;
}
arb->their_gpio = ret;
arb->their_gpio_release = !!(gpio_flags & OF_GPIO_ACTIVE_LOW);
ret = devm_gpio_request_one(dev, arb->their_gpio, GPIOF_IN,
"their-claim-gpio");
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "Error requesting their-claim-gpio\n");
return ret;
}
/* At the moment we only support a single two master (us + 1 other) */
if (gpio_is_valid(of_get_named_gpio(np, "their-claim-gpios", 1))) {
dev_err(dev, "Only one other master is supported\n");
return -EINVAL;
}
/* Arbitration parameters */
if (of_property_read_u32(np, "slew-delay-us", &arb->slew_delay_us))
arb->slew_delay_us = 10;
if (of_property_read_u32(np, "wait-retry-us", &arb->wait_retry_us))
arb->wait_retry_us = 3000;
if (of_property_read_u32(np, "wait-free-us", &arb->wait_free_us))
arb->wait_free_us = 50000;
/* Find our parent */
parent_np = of_parse_phandle(np, "i2c-parent", 0);
if (!parent_np) {
dev_err(dev, "Cannot parse i2c-parent\n");
return -EINVAL;
}
arb->parent = of_find_i2c_adapter_by_node(parent_np);
if (!arb->parent) {
dev_err(dev, "Cannot find parent bus\n");
return -EINVAL;
}
/* Actually add the mux adapter */
arb->child = i2c_add_mux_adapter(arb->parent, dev, arb, 0, 0, 0,
i2c_arbitrator_select,
i2c_arbitrator_deselect);
if (!arb->child) {
dev_err(dev, "Failed to add adapter\n");
ret = -ENODEV;
i2c_put_adapter(arb->parent);
}
return ret;
}
static int i2c_arbitrator_remove(struct platform_device *pdev)
{
struct i2c_arbitrator_data *arb = platform_get_drvdata(pdev);
i2c_del_mux_adapter(arb->child);
i2c_put_adapter(arb->parent);
return 0;
}
static const struct of_device_id i2c_arbitrator_of_match[] = {
{ .compatible = "i2c-arb-gpio-challenge", },
{},
};
MODULE_DEVICE_TABLE(of, i2c_arbitrator_of_match);
static struct platform_driver i2c_arbitrator_driver = {
.probe = i2c_arbitrator_probe,
.remove = i2c_arbitrator_remove,
.driver = {
.owner = THIS_MODULE,
.name = "i2c-arb-gpio-challenge",
.of_match_table = of_match_ptr(i2c_arbitrator_of_match),
},
};
module_platform_driver(i2c_arbitrator_driver);
MODULE_DESCRIPTION("GPIO-based I2C Arbitration");
MODULE_AUTHOR("Doug Anderson <dianders@chromium.org>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:i2c-arb-gpio-challenge");

17
drivers/i2c/muxes/i2c-mux-gpio.c
View File

@ -201,10 +201,21 @@ static int i2c_mux_gpio_probe(struct platform_device *pdev)
for (i = 0; i < mux->data.n_gpios; i++) {
ret = gpio_request(gpio_base + mux->data.gpios[i], "i2c-mux-gpio");
if (ret)
if (ret) {
dev_err(&pdev->dev, "Failed to request GPIO %d\n",
mux->data.gpios[i]);
goto err_request_gpio;
gpio_direction_output(gpio_base + mux->data.gpios[i],
initial_state & (1 << i));
}
ret = gpio_direction_output(gpio_base + mux->data.gpios[i],
initial_state & (1 << i));
if (ret) {
dev_err(&pdev->dev,
"Failed to set direction of GPIO %d to output\n",
mux->data.gpios[i]);
i++; /* gpio_request above succeeded, so must free */
goto err_request_gpio;
}
}
for (i = 0; i < mux->data.n_values; i++) {

6
drivers/i2c/muxes/i2c-mux-pca954x.c
View File

@ -262,13 +262,11 @@ static int pca954x_remove(struct i2c_client *client)
{
struct pca954x *data = i2c_get_clientdata(client);
const struct chip_desc *chip = &chips[data->type];
int i, err;
int i;
for (i = 0; i < chip->nchans; ++i)
if (data->virt_adaps[i]) {
err = i2c_del_mux_adapter(data->virt_adaps[i]);
if (err)
return err;
i2c_del_mux_adapter(data->virt_adaps[i]);
data->virt_adaps[i] = NULL;
}

6
drivers/media/pci/bt8xx/bttv-i2c.c
View File

@ -397,8 +397,8 @@ int init_bttv_i2c(struct bttv *btv)
int fini_bttv_i2c(struct bttv *btv)
{
if (0 != btv->i2c_rc)
return 0;
if (btv->i2c_rc == 0)
i2c_del_adapter(&btv->c.i2c_adap);
return i2c_del_adapter(&btv->c.i2c_adap);
return 0;
}

4
drivers/media/pci/mantis/mantis_i2c.c
View File

@ -261,6 +261,8 @@ int mantis_i2c_exit(struct mantis_pci *mantis)
mmwrite((intmask & ~MANTIS_INT_I2CDONE), MANTIS_INT_MASK);
dprintk(MANTIS_DEBUG, 1, "Removing I2C adapter");
return i2c_del_adapter(&mantis->adapter);
i2c_del_adapter(&mantis->adapter);
return 0;
}
EXPORT_SYMBOL_GPL(mantis_i2c_exit);

6
drivers/net/ethernet/sfc/falcon.c
View File

@ -1528,7 +1528,7 @@ static int falcon_probe_nic(struct efx_nic *efx)
return 0;
fail6:
BUG_ON(i2c_del_adapter(&board->i2c_adap));
i2c_del_adapter(&board->i2c_adap);
memset(&board->i2c_adap, 0, sizeof(board->i2c_adap));
fail5:
efx_nic_free_buffer(efx, &efx->irq_status);
@ -1666,13 +1666,11 @@ static void falcon_remove_nic(struct efx_nic *efx)
{
struct falcon_nic_data *nic_data = efx->nic_data;
struct falcon_board *board = falcon_board(efx);
int rc;
board->type->fini(efx);
/* Remove I2C adapter and clear it in preparation for a retry */
rc = i2c_del_adapter(&board->i2c_adap);
BUG_ON(rc);
i2c_del_adapter(&board->i2c_adap);
memset(&board->i2c_adap, 0, sizeof(board->i2c_adap));
efx_nic_free_buffer(efx, &efx->irq_status);

7
drivers/staging/media/go7007/go7007-driver.c
View File

@ -242,11 +242,8 @@ static void go7007_remove(struct v4l2_device *v4l2_dev)
if (go->hpi_ops->release)
go->hpi_ops->release(go);
if (go->i2c_adapter_online) {
if (i2c_del_adapter(&go->i2c_adapter) == 0)
go->i2c_adapter_online = 0;
else
v4l2_err(&go->v4l2_dev,
"error removing I2C adapter!\n");
i2c_del_adapter(&go->i2c_adapter);
go->i2c_adapter_online = 0;
}
kfree(go->boot_fw);

2
include/linux/i2c-mux.h
View File

@ -42,7 +42,7 @@ struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent,
int (*deselect) (struct i2c_adapter *,
void *mux_dev, u32 chan_id));
int i2c_del_mux_adapter(struct i2c_adapter *adap);
void i2c_del_mux_adapter(struct i2c_adapter *adap);
#endif /* __KERNEL__ */

25
include/linux/i2c-tegra.h
View File

@ -1,25 +0,0 @@
/*
* drivers/i2c/busses/i2c-tegra.c
*
* Copyright (C) 2010 Google, Inc.
* Author: Colin Cross <ccross@android.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef _LINUX_I2C_TEGRA_H
#define _LINUX_I2C_TEGRA_H
struct tegra_i2c_platform_data {
unsigned long bus_clk_rate;
};
#endif /* _LINUX_I2C_TEGRA_H */

50
include/linux/i2c.h
View File

@ -125,7 +125,6 @@ extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
* struct i2c_driver - represent an I2C device driver
* @class: What kind of i2c device we instantiate (for detect)
* @attach_adapter: Callback for bus addition (deprecated)
* @detach_adapter: Callback for bus removal (deprecated)
* @probe: Callback for device binding
* @remove: Callback for device unbinding
* @shutdown: Callback for device shutdown
@ -162,12 +161,10 @@ extern s32 i2c_smbus_write_i2c_block_data(const struct i2c_client *client,
struct i2c_driver {
unsigned int class;
/* Notifies the driver that a new bus has appeared or is about to be
* removed. You should avoid using this, it will be removed in a
* near future.
/* Notifies the driver that a new bus has appeared. You should avoid
* using this, it will be removed in a near future.
*/
int (*attach_adapter)(struct i2c_adapter *) __deprecated;
int (*detach_adapter)(struct i2c_adapter *) __deprecated;
/* Standard driver model interfaces */
int (*probe)(struct i2c_client *, const struct i2c_device_id *);
@ -370,6 +367,45 @@ struct i2c_algorithm {
u32 (*functionality) (struct i2c_adapter *);
};
/**
* struct i2c_bus_recovery_info - I2C bus recovery information
* @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or
* i2c_generic_scl_recovery() or i2c_generic_gpio_recovery().
* @get_scl: This gets current value of SCL line. Mandatory for generic SCL
* recovery. Used internally for generic GPIO recovery.
* @set_scl: This sets/clears SCL line. Mandatory for generic SCL recovery. Used
* internally for generic GPIO recovery.
* @get_sda: This gets current value of SDA line. Optional for generic SCL
* recovery. Used internally, if sda_gpio is a valid GPIO, for generic GPIO
* recovery.
* @prepare_recovery: This will be called before starting recovery. Platform may
* configure padmux here for SDA/SCL line or something else they want.
* @unprepare_recovery: This will be called after completing recovery. Platform
* may configure padmux here for SDA/SCL line or something else they want.
* @scl_gpio: gpio number of the SCL line. Only required for GPIO recovery.
* @sda_gpio: gpio number of the SDA line. Only required for GPIO recovery.
*/
struct i2c_bus_recovery_info {
int (*recover_bus)(struct i2c_adapter *);
int (*get_scl)(struct i2c_adapter *);
void (*set_scl)(struct i2c_adapter *, int val);
int (*get_sda)(struct i2c_adapter *);
void (*prepare_recovery)(struct i2c_bus_recovery_info *bri);
void (*unprepare_recovery)(struct i2c_bus_recovery_info *bri);
/* gpio recovery */
int scl_gpio;
int sda_gpio;
};
int i2c_recover_bus(struct i2c_adapter *adap);
/* Generic recovery routines */
int i2c_generic_gpio_recovery(struct i2c_adapter *adap);
int i2c_generic_scl_recovery(struct i2c_adapter *adap);
/*
* i2c_adapter is the structure used to identify a physical i2c bus along
* with the access algorithms necessary to access it.
@ -393,6 +429,8 @@ struct i2c_adapter {
struct mutex userspace_clients_lock;
struct list_head userspace_clients;
struct i2c_bus_recovery_info *bus_recovery_info;
};
#define to_i2c_adapter(d) container_of(d, struct i2c_adapter, dev)
@ -450,7 +488,7 @@ void i2c_unlock_adapter(struct i2c_adapter *);
*/
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
extern int i2c_add_adapter(struct i2c_adapter *);
extern int i2c_del_adapter(struct i2c_adapter *);
extern void i2c_del_adapter(struct i2c_adapter *);
extern int i2c_add_numbered_adapter(struct i2c_adapter *);
extern int i2c_register_driver(struct module *, struct i2c_driver *);