forked from Minki/linux
i2c: iMX/MXC support
Implementation of I2C Adapter/Algorithm Driver for I2C Bus integrated in Freescale's i.MX/MXC processors. Signed-off-by: Darius Augulis <augulis.darius@gmail.com> Tested-by: Sascha Hauer <s.hauer@pengutronix.de> Reviewed-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Darius Augulis
Ben Dooks
parent
d508afb437
commit
aa11e38ce6
25
arch/arm/plat-mxc/include/mach/i2c.h
Normal file
25
arch/arm/plat-mxc/include/mach/i2c.h
Normal file
@ -0,0 +1,25 @@
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/*
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* i2c.h - i.MX I2C driver header file
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*
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* Copyright (c) 2008, Darius Augulis <augulis.darius@gmail.com>
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*
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* This file is released under the GPLv2
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*/
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#ifndef __ASM_ARCH_I2C_H_
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#define __ASM_ARCH_I2C_H_
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/**
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* struct imxi2c_platform_data - structure of platform data for MXC I2C driver
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* @init: Initialise gpio's and other board specific things
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* @exit: Free everything initialised by @init
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* @bitrate: Bus speed measured in Hz
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*
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**/
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struct imxi2c_platform_data {
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int (*init)(struct device *dev);
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void (*exit)(struct device *dev);
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int bitrate;
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};
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#endif /* __ASM_ARCH_I2C_H_ */
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@ -356,6 +356,16 @@ config I2C_IBM_IIC
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This driver can also be built as a module. If so, the module
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will be called i2c-ibm_iic.
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config I2C_IMX
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tristate "IMX I2C interface"
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depends on ARCH_MXC
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help
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Say Y here if you want to use the IIC bus controller on
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the Freescale i.MX/MXC processors.
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This driver can also be built as a module. If so, the module
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will be called i2c-imx.
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config I2C_IOP3XX
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tristate "Intel IOPx3xx and IXP4xx on-chip I2C interface"
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depends on ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX || ARCH_IOP13XX
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@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_DAVINCI) += i2c-davinci.o
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obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
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obj-$(CONFIG_I2C_HIGHLANDER) += i2c-highlander.o
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obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o
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obj-$(CONFIG_I2C_IMX) += i2c-imx.o
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obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o
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obj-$(CONFIG_I2C_IXP2000) += i2c-ixp2000.o
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obj-$(CONFIG_I2C_MPC) += i2c-mpc.o
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617
drivers/i2c/busses/i2c-imx.c
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617
drivers/i2c/busses/i2c-imx.c
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@ -0,0 +1,617 @@
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/*
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* Copyright (C) 2002 Motorola GSG-China
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*
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* Author:
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* Darius Augulis, Teltonika Inc.
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*
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* Desc.:
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* Implementation of I2C Adapter/Algorithm Driver
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* for I2C Bus integrated in Freescale i.MX/MXC processors
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*
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* Derived from Motorola GSG China I2C example driver
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*
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* Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de
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* Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de
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* Copyright (C) 2007 RightHand Technologies, Inc.
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* Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>
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*
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*/
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/** Includes *******************************************************************
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*******************************************************************************/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/io.h>
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#include <linux/sched.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <mach/irqs.h>
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#include <mach/hardware.h>
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#include <mach/i2c.h>
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/** Defines ********************************************************************
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*******************************************************************************/
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/* This will be the driver name the kernel reports */
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#define DRIVER_NAME "imx-i2c"
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/* Default value */
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#define IMX_I2C_BIT_RATE 100000 /* 100kHz */
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/* IMX I2C registers */
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#define IMX_I2C_IADR 0x00 /* i2c slave address */
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#define IMX_I2C_IFDR 0x04 /* i2c frequency divider */
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#define IMX_I2C_I2CR 0x08 /* i2c control */
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#define IMX_I2C_I2SR 0x0C /* i2c status */
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#define IMX_I2C_I2DR 0x10 /* i2c transfer data */
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/* Bits of IMX I2C registers */
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#define I2SR_RXAK 0x01
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#define I2SR_IIF 0x02
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#define I2SR_SRW 0x04
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#define I2SR_IAL 0x10
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#define I2SR_IBB 0x20
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#define I2SR_IAAS 0x40
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#define I2SR_ICF 0x80
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#define I2CR_RSTA 0x04
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#define I2CR_TXAK 0x08
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#define I2CR_MTX 0x10
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#define I2CR_MSTA 0x20
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#define I2CR_IIEN 0x40
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#define I2CR_IEN 0x80
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/** Variables ******************************************************************
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*******************************************************************************/
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static unsigned int disable_delay; /* Dummy delay */
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/*
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* sorted list of clock divider, register value pairs
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* taken from table 26-5, p.26-9, Freescale i.MX
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* Integrated Portable System Processor Reference Manual
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* Document Number: MC9328MXLRM, Rev. 5.1, 06/2007
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*
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* Duplicated divider values removed from list
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*/
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static u16 __initdata i2c_clk_div[50][2] = {
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{ 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 },
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{ 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 },
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{ 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 },
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{ 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B },
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{ 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A },
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{ 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 },
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{ 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 },
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{ 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 },
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{ 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 },
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{ 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B },
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{ 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E },
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{ 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D },
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{ 3072, 0x1E }, { 3840, 0x1F }
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};
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struct imx_i2c_struct {
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struct i2c_adapter adapter;
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struct resource *res;
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struct clk *clk;
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void __iomem *base;
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int irq;
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wait_queue_head_t queue;
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unsigned long i2csr;
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};
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/** Functions for IMX I2C adapter driver ***************************************
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*******************************************************************************/
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static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx)
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{
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unsigned long orig_jiffies = jiffies;
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dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
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/* wait for bus not busy */
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while (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_IBB) {
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if (signal_pending(current)) {
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dev_dbg(&i2c_imx->adapter.dev,
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"<%s> I2C Interrupted\n", __func__);
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return -EINTR;
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}
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if (time_after(jiffies, orig_jiffies + HZ / 1000)) {
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dev_dbg(&i2c_imx->adapter.dev,
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"<%s> I2C bus is busy\n", __func__);
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return -EIO;
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}
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schedule();
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}
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return 0;
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}
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static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx)
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{
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int result;
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result = wait_event_interruptible_timeout(i2c_imx->queue,
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i2c_imx->i2csr & I2SR_IIF, HZ / 10);
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if (unlikely(result < 0)) {
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dev_dbg(&i2c_imx->adapter.dev, "<%s> result < 0\n", __func__);
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return result;
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} else if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) {
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dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__);
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return -ETIMEDOUT;
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}
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dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__);
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i2c_imx->i2csr = 0;
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return 0;
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}
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static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx)
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{
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if (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_RXAK) {
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dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__);
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return -EIO; /* No ACK */
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}
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dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__);
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return 0;
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}
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static void i2c_imx_start(struct imx_i2c_struct *i2c_imx)
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{
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unsigned int temp = 0;
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dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
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/* Enable I2C controller */
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writeb(I2CR_IEN, i2c_imx->base + IMX_I2C_I2CR);
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/* Start I2C transaction */
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temp = readb(i2c_imx->base + IMX_I2C_I2CR);
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temp |= I2CR_MSTA;
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writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
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temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK;
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writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
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}
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static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
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{
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unsigned int temp = 0;
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/* Stop I2C transaction */
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dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
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temp = readb(i2c_imx->base + IMX_I2C_I2CR);
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temp &= ~I2CR_MSTA;
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writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
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/* setup chip registers to defaults */
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writeb(I2CR_IEN, i2c_imx->base + IMX_I2C_I2CR);
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writeb(0, i2c_imx->base + IMX_I2C_I2SR);
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/*
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* This delay caused by an i.MXL hardware bug.
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* If no (or too short) delay, no "STOP" bit will be generated.
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*/
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udelay(disable_delay);
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/* Disable I2C controller */
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writeb(0, i2c_imx->base + IMX_I2C_I2CR);
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}
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static void __init i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx,
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unsigned int rate)
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{
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unsigned int i2c_clk_rate;
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unsigned int div;
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int i;
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/* Divider value calculation */
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i2c_clk_rate = clk_get_rate(i2c_imx->clk);
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div = (i2c_clk_rate + rate - 1) / rate;
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if (div < i2c_clk_div[0][0])
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i = 0;
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else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0])
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i = ARRAY_SIZE(i2c_clk_div) - 1;
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else
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for (i = 0; i2c_clk_div[i][0] < div; i++);
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/* Write divider value to register */
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writeb(i2c_clk_div[i][1], i2c_imx->base + IMX_I2C_IFDR);
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/*
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* There dummy delay is calculated.
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* It should be about one I2C clock period long.
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* This delay is used in I2C bus disable function
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* to fix chip hardware bug.
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*/
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disable_delay = (500000U * i2c_clk_div[i][0]
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+ (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2);
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/* dev_dbg() can't be used, because adapter is not yet registered */
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#ifdef CONFIG_I2C_DEBUG_BUS
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printk(KERN_DEBUG "I2C: <%s> I2C_CLK=%d, REQ DIV=%d\n",
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__func__, i2c_clk_rate, div);
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printk(KERN_DEBUG "I2C: <%s> IFDR[IC]=0x%x, REAL DIV=%d\n",
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__func__, i2c_clk_div[i][1], i2c_clk_div[i][0]);
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#endif
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}
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static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
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{
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struct imx_i2c_struct *i2c_imx = dev_id;
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unsigned int temp;
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temp = readb(i2c_imx->base + IMX_I2C_I2SR);
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if (temp & I2SR_IIF) {
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/* save status register */
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i2c_imx->i2csr = temp;
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temp &= ~I2SR_IIF;
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writeb(temp, i2c_imx->base + IMX_I2C_I2SR);
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wake_up_interruptible(&i2c_imx->queue);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
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{
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int i, result;
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dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n",
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__func__, msgs->addr << 1);
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/* write slave address */
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writeb(msgs->addr << 1, i2c_imx->base + IMX_I2C_I2DR);
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result = i2c_imx_trx_complete(i2c_imx);
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if (result)
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return result;
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result = i2c_imx_acked(i2c_imx);
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if (result)
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return result;
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dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__);
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/* write data */
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for (i = 0; i < msgs->len; i++) {
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dev_dbg(&i2c_imx->adapter.dev,
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"<%s> write byte: B%d=0x%X\n",
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__func__, i, msgs->buf[i]);
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writeb(msgs->buf[i], i2c_imx->base + IMX_I2C_I2DR);
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result = i2c_imx_trx_complete(i2c_imx);
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if (result)
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return result;
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result = i2c_imx_acked(i2c_imx);
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if (result)
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return result;
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}
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return 0;
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}
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static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
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{
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int i, result;
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unsigned int temp;
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dev_dbg(&i2c_imx->adapter.dev,
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"<%s> write slave address: addr=0x%x\n",
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__func__, (msgs->addr << 1) | 0x01);
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/* write slave address */
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writeb((msgs->addr << 1) | 0x01, i2c_imx->base + IMX_I2C_I2DR);
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result = i2c_imx_trx_complete(i2c_imx);
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if (result)
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return result;
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result = i2c_imx_acked(i2c_imx);
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if (result)
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return result;
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dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__);
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/* setup bus to read data */
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temp = readb(i2c_imx->base + IMX_I2C_I2CR);
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temp &= ~I2CR_MTX;
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if (msgs->len - 1)
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temp &= ~I2CR_TXAK;
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writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
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readb(i2c_imx->base + IMX_I2C_I2DR); /* dummy read */
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dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__);
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/* read data */
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for (i = 0; i < msgs->len; i++) {
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result = i2c_imx_trx_complete(i2c_imx);
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if (result)
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return result;
|
||||
if (i == (msgs->len - 1)) {
|
||||
dev_dbg(&i2c_imx->adapter.dev,
|
||||
"<%s> clear MSTA\n", __func__);
|
||||
temp = readb(i2c_imx->base + IMX_I2C_I2CR);
|
||||
temp &= ~I2CR_MSTA;
|
||||
writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
|
||||
} else if (i == (msgs->len - 2)) {
|
||||
dev_dbg(&i2c_imx->adapter.dev,
|
||||
"<%s> set TXAK\n", __func__);
|
||||
temp = readb(i2c_imx->base + IMX_I2C_I2CR);
|
||||
temp |= I2CR_TXAK;
|
||||
writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
|
||||
}
|
||||
msgs->buf[i] = readb(i2c_imx->base + IMX_I2C_I2DR);
|
||||
dev_dbg(&i2c_imx->adapter.dev,
|
||||
"<%s> read byte: B%d=0x%X\n",
|
||||
__func__, i, msgs->buf[i]);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int i2c_imx_xfer(struct i2c_adapter *adapter,
|
||||
struct i2c_msg *msgs, int num)
|
||||
{
|
||||
unsigned int i, temp;
|
||||
int result;
|
||||
struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter);
|
||||
|
||||
dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
|
||||
|
||||
/* Check if i2c bus is not busy */
|
||||
result = i2c_imx_bus_busy(i2c_imx);
|
||||
if (result)
|
||||
goto fail0;
|
||||
|
||||
/* Start I2C transfer */
|
||||
i2c_imx_start(i2c_imx);
|
||||
|
||||
/* read/write data */
|
||||
for (i = 0; i < num; i++) {
|
||||
if (i) {
|
||||
dev_dbg(&i2c_imx->adapter.dev,
|
||||
"<%s> repeated start\n", __func__);
|
||||
temp = readb(i2c_imx->base + IMX_I2C_I2CR);
|
||||
temp |= I2CR_RSTA;
|
||||
writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
|
||||
}
|
||||
dev_dbg(&i2c_imx->adapter.dev,
|
||||
"<%s> transfer message: %d\n", __func__, i);
|
||||
/* write/read data */
|
||||
#ifdef CONFIG_I2C_DEBUG_BUS
|
||||
temp = readb(i2c_imx->base + IMX_I2C_I2CR);
|
||||
dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, "
|
||||
"MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__,
|
||||
(temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0),
|
||||
(temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0),
|
||||
(temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0));
|
||||
temp = readb(i2c_imx->base + IMX_I2C_I2SR);
|
||||
dev_dbg(&i2c_imx->adapter.dev,
|
||||
"<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, "
|
||||
"IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", __func__,
|
||||
(temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0),
|
||||
(temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0),
|
||||
(temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0),
|
||||
(temp & I2SR_RXAK ? 1 : 0));
|
||||
#endif
|
||||
if (msgs[i].flags & I2C_M_RD)
|
||||
result = i2c_imx_read(i2c_imx, &msgs[i]);
|
||||
else
|
||||
result = i2c_imx_write(i2c_imx, &msgs[i]);
|
||||
}
|
||||
|
||||
fail0:
|
||||
/* Stop I2C transfer */
|
||||
i2c_imx_stop(i2c_imx);
|
||||
|
||||
dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
|
||||
(result < 0) ? "error" : "success msg",
|
||||
(result < 0) ? result : num);
|
||||
return (result < 0) ? result : num;
|
||||
}
|
||||
|
||||
static u32 i2c_imx_func(struct i2c_adapter *adapter)
|
||||
{
|
||||
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
|
||||
}
|
||||
|
||||
static struct i2c_algorithm i2c_imx_algo = {
|
||||
.master_xfer = i2c_imx_xfer,
|
||||
.functionality = i2c_imx_func,
|
||||
};
|
||||
|
||||
static int __init i2c_imx_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct imx_i2c_struct *i2c_imx;
|
||||
struct resource *res;
|
||||
struct imxi2c_platform_data *pdata;
|
||||
void __iomem *base;
|
||||
resource_size_t res_size;
|
||||
int irq;
|
||||
int ret;
|
||||
|
||||
dev_dbg(&pdev->dev, "<%s>\n", __func__);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
if (!res) {
|
||||
dev_err(&pdev->dev, "can't get device resources\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
irq = platform_get_irq(pdev, 0);
|
||||
if (irq < 0) {
|
||||
dev_err(&pdev->dev, "can't get irq number\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
pdata = pdev->dev.platform_data;
|
||||
|
||||
if (pdata && pdata->init) {
|
||||
ret = pdata->init(&pdev->dev);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
res_size = resource_size(res);
|
||||
base = ioremap(res->start, res_size);
|
||||
if (!base) {
|
||||
dev_err(&pdev->dev, "ioremap failed\n");
|
||||
ret = -EIO;
|
||||
goto fail0;
|
||||
}
|
||||
|
||||
i2c_imx = kzalloc(sizeof(struct imx_i2c_struct), GFP_KERNEL);
|
||||
if (!i2c_imx) {
|
||||
dev_err(&pdev->dev, "can't allocate interface\n");
|
||||
ret = -ENOMEM;
|
||||
goto fail1;
|
||||
}
|
||||
|
||||
/* Setup i2c_imx driver structure */
|
||||
strcpy(i2c_imx->adapter.name, pdev->name);
|
||||
i2c_imx->adapter.owner = THIS_MODULE;
|
||||
i2c_imx->adapter.algo = &i2c_imx_algo;
|
||||
i2c_imx->adapter.dev.parent = &pdev->dev;
|
||||
i2c_imx->adapter.nr = pdev->id;
|
||||
i2c_imx->irq = irq;
|
||||
i2c_imx->base = base;
|
||||
i2c_imx->res = res;
|
||||
|
||||
/* Get I2C clock */
|
||||
i2c_imx->clk = clk_get(&pdev->dev, "i2c_clk");
|
||||
if (IS_ERR(i2c_imx->clk)) {
|
||||
ret = PTR_ERR(i2c_imx->clk);
|
||||
dev_err(&pdev->dev, "can't get I2C clock\n");
|
||||
goto fail2;
|
||||
}
|
||||
clk_enable(i2c_imx->clk);
|
||||
|
||||
/* Request IRQ */
|
||||
ret = request_irq(i2c_imx->irq, i2c_imx_isr, 0, pdev->name, i2c_imx);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "can't claim irq %d\n", i2c_imx->irq);
|
||||
goto fail3;
|
||||
}
|
||||
|
||||
/* Init queue */
|
||||
init_waitqueue_head(&i2c_imx->queue);
|
||||
|
||||
/* Set up adapter data */
|
||||
i2c_set_adapdata(&i2c_imx->adapter, i2c_imx);
|
||||
|
||||
/* Set up clock divider */
|
||||
if (pdata && pdata->bitrate)
|
||||
i2c_imx_set_clk(i2c_imx, pdata->bitrate);
|
||||
else
|
||||
i2c_imx_set_clk(i2c_imx, IMX_I2C_BIT_RATE);
|
||||
|
||||
/* Set up chip registers to defaults */
|
||||
writeb(0, i2c_imx->base + IMX_I2C_I2CR);
|
||||
writeb(0, i2c_imx->base + IMX_I2C_I2SR);
|
||||
|
||||
/* Add I2C adapter */
|
||||
ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "registration failed\n");
|
||||
goto fail4;
|
||||
}
|
||||
|
||||
/* Set up platform driver data */
|
||||
platform_set_drvdata(pdev, i2c_imx);
|
||||
|
||||
dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", i2c_imx->irq);
|
||||
dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n",
|
||||
i2c_imx->res->start, i2c_imx->res->end);
|
||||
dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x \n",
|
||||
res_size, i2c_imx->res->start);
|
||||
dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
|
||||
i2c_imx->adapter.name);
|
||||
dev_dbg(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
|
||||
|
||||
return 0; /* Return OK */
|
||||
|
||||
fail4:
|
||||
free_irq(i2c_imx->irq, i2c_imx);
|
||||
fail3:
|
||||
clk_disable(i2c_imx->clk);
|
||||
clk_put(i2c_imx->clk);
|
||||
fail2:
|
||||
kfree(i2c_imx);
|
||||
fail1:
|
||||
iounmap(base);
|
||||
fail0:
|
||||
if (pdata && pdata->exit)
|
||||
pdata->exit(&pdev->dev);
|
||||
return ret; /* Return error number */
|
||||
}
|
||||
|
||||
static int __exit i2c_imx_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
|
||||
struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
|
||||
|
||||
/* remove adapter */
|
||||
dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
|
||||
i2c_del_adapter(&i2c_imx->adapter);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
/* free interrupt */
|
||||
free_irq(i2c_imx->irq, i2c_imx);
|
||||
|
||||
/* setup chip registers to defaults */
|
||||
writeb(0, i2c_imx->base + IMX_I2C_IADR);
|
||||
writeb(0, i2c_imx->base + IMX_I2C_IFDR);
|
||||
writeb(0, i2c_imx->base + IMX_I2C_I2CR);
|
||||
writeb(0, i2c_imx->base + IMX_I2C_I2SR);
|
||||
|
||||
/* Shut down hardware */
|
||||
if (pdata && pdata->exit)
|
||||
pdata->exit(&pdev->dev);
|
||||
|
||||
/* Disable I2C clock */
|
||||
clk_disable(i2c_imx->clk);
|
||||
clk_put(i2c_imx->clk);
|
||||
|
||||
iounmap(i2c_imx->base);
|
||||
kfree(i2c_imx);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver i2c_imx_driver = {
|
||||
.probe = i2c_imx_probe,
|
||||
.remove = __exit_p(i2c_imx_remove),
|
||||
.driver = {
|
||||
.name = DRIVER_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
}
|
||||
};
|
||||
|
||||
static int __init i2c_adap_imx_init(void)
|
||||
{
|
||||
return platform_driver_probe(&i2c_imx_driver, i2c_imx_probe);
|
||||
}
|
||||
|
||||
static void __exit i2c_adap_imx_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&i2c_imx_driver);
|
||||
}
|
||||
|
||||
module_init(i2c_adap_imx_init);
|
||||
module_exit(i2c_adap_imx_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Darius Augulis");
|
||||
MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus");
|
||||
MODULE_ALIAS("platform:" DRIVER_NAME);
|
||||
Loading…
Reference in New Issue
Block a user