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4f079985b2
linux/drivers/mfd/ab8500-core.c
Mattias Wallin 4f079985b2 mfd: ab8500-core wake up from suspend 
This patch makes the system wake up from suspend when an
ab8500 interrupt occur. This can for example be USB cable
insert or an RTC alarm.

Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2011-01-14 12:37:47 +01:00

564 lines
13 KiB
C
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/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
* Author: Rabin Vincent <rabin.vincent@stericsson.com>
* Changes: Mattias Wallin <mattias.wallin@stericsson.com>
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/ab8500.h>
#include <linux/regulator/ab8500.h>
/*
* Interrupt register offsets
* Bank : 0x0E
*/
#define AB8500_IT_SOURCE1_REG 0x00
#define AB8500_IT_SOURCE2_REG 0x01
#define AB8500_IT_SOURCE3_REG 0x02
#define AB8500_IT_SOURCE4_REG 0x03
#define AB8500_IT_SOURCE5_REG 0x04
#define AB8500_IT_SOURCE6_REG 0x05
#define AB8500_IT_SOURCE7_REG 0x06
#define AB8500_IT_SOURCE8_REG 0x07
#define AB8500_IT_SOURCE19_REG 0x12
#define AB8500_IT_SOURCE20_REG 0x13
#define AB8500_IT_SOURCE21_REG 0x14
#define AB8500_IT_SOURCE22_REG 0x15
#define AB8500_IT_SOURCE23_REG 0x16
#define AB8500_IT_SOURCE24_REG 0x17
/*
* latch registers
*/
#define AB8500_IT_LATCH1_REG 0x20
#define AB8500_IT_LATCH2_REG 0x21
#define AB8500_IT_LATCH3_REG 0x22
#define AB8500_IT_LATCH4_REG 0x23
#define AB8500_IT_LATCH5_REG 0x24
#define AB8500_IT_LATCH6_REG 0x25
#define AB8500_IT_LATCH7_REG 0x26
#define AB8500_IT_LATCH8_REG 0x27
#define AB8500_IT_LATCH9_REG 0x28
#define AB8500_IT_LATCH10_REG 0x29
#define AB8500_IT_LATCH19_REG 0x32
#define AB8500_IT_LATCH20_REG 0x33
#define AB8500_IT_LATCH21_REG 0x34
#define AB8500_IT_LATCH22_REG 0x35
#define AB8500_IT_LATCH23_REG 0x36
#define AB8500_IT_LATCH24_REG 0x37
/*
* mask registers
*/
#define AB8500_IT_MASK1_REG 0x40
#define AB8500_IT_MASK2_REG 0x41
#define AB8500_IT_MASK3_REG 0x42
#define AB8500_IT_MASK4_REG 0x43
#define AB8500_IT_MASK5_REG 0x44
#define AB8500_IT_MASK6_REG 0x45
#define AB8500_IT_MASK7_REG 0x46
#define AB8500_IT_MASK8_REG 0x47
#define AB8500_IT_MASK9_REG 0x48
#define AB8500_IT_MASK10_REG 0x49
#define AB8500_IT_MASK11_REG 0x4A
#define AB8500_IT_MASK12_REG 0x4B
#define AB8500_IT_MASK13_REG 0x4C
#define AB8500_IT_MASK14_REG 0x4D
#define AB8500_IT_MASK15_REG 0x4E
#define AB8500_IT_MASK16_REG 0x4F
#define AB8500_IT_MASK17_REG 0x50
#define AB8500_IT_MASK18_REG 0x51
#define AB8500_IT_MASK19_REG 0x52
#define AB8500_IT_MASK20_REG 0x53
#define AB8500_IT_MASK21_REG 0x54
#define AB8500_IT_MASK22_REG 0x55
#define AB8500_IT_MASK23_REG 0x56
#define AB8500_IT_MASK24_REG 0x57
#define AB8500_REV_REG 0x80
/*
* Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
* numbers are indexed into this array with (num / 8).
*
* This is one off from the register names, i.e. AB8500_IT_MASK1_REG is at
* offset 0.
*/
static const int ab8500_irq_regoffset[AB8500_NUM_IRQ_REGS] = {
0, 1, 2, 3, 4, 6, 7, 8, 9, 18, 19, 20, 21,
};
static int ab8500_get_chip_id(struct device *dev)
{
struct ab8500 *ab8500;
if (!dev)
return -EINVAL;
ab8500 = dev_get_drvdata(dev->parent);
return ab8500 ? (int)ab8500->chip_id : -EINVAL;
}
static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,
u8 reg, u8 data)
{
int ret;
/*
* Put the u8 bank and u8 register together into a an u16.
* The bank on higher 8 bits and register in lower 8 bits.
* */
u16 addr = ((u16)bank) << 8 | reg;
dev_vdbg(ab8500->dev, "wr: addr %#x <= %#x\n", addr, data);
ret = mutex_lock_interruptible(&ab8500->lock);
if (ret)
return ret;
ret = ab8500->write(ab8500, addr, data);
if (ret < 0)
dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
addr, ret);
mutex_unlock(&ab8500->lock);
return ret;
}
static int ab8500_set_register(struct device *dev, u8 bank,
u8 reg, u8 value)
{
struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
return set_register_interruptible(ab8500, bank, reg, value);
}
static int get_register_interruptible(struct ab8500 *ab8500, u8 bank,
u8 reg, u8 *value)
{
int ret;
/* put the u8 bank and u8 reg together into a an u16.
* bank on higher 8 bits and reg in lower */
u16 addr = ((u16)bank) << 8 | reg;
ret = mutex_lock_interruptible(&ab8500->lock);
if (ret)
return ret;
ret = ab8500->read(ab8500, addr);
if (ret < 0)
dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
addr, ret);
else
*value = ret;
mutex_unlock(&ab8500->lock);
dev_vdbg(ab8500->dev, "rd: addr %#x => data %#x\n", addr, ret);
return ret;
}
static int ab8500_get_register(struct device *dev, u8 bank,
u8 reg, u8 *value)
{
struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
return get_register_interruptible(ab8500, bank, reg, value);
}
static int mask_and_set_register_interruptible(struct ab8500 *ab8500, u8 bank,
u8 reg, u8 bitmask, u8 bitvalues)
{
int ret;
u8 data;
/* put the u8 bank and u8 reg together into a an u16.
* bank on higher 8 bits and reg in lower */
u16 addr = ((u16)bank) << 8 | reg;
ret = mutex_lock_interruptible(&ab8500->lock);
if (ret)
return ret;
ret = ab8500->read(ab8500, addr);
if (ret < 0) {
dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
addr, ret);
goto out;
}
data = (u8)ret;
data = (~bitmask & data) | (bitmask & bitvalues);
ret = ab8500->write(ab8500, addr, data);
if (ret < 0)
dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
addr, ret);
dev_vdbg(ab8500->dev, "mask: addr %#x => data %#x\n", addr, data);
out:
mutex_unlock(&ab8500->lock);
return ret;
}
static int ab8500_mask_and_set_register(struct device *dev,
u8 bank, u8 reg, u8 bitmask, u8 bitvalues)
{
struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
return mask_and_set_register_interruptible(ab8500, bank, reg,
bitmask, bitvalues);
}
static struct abx500_ops ab8500_ops = {
.get_chip_id = ab8500_get_chip_id,
.get_register = ab8500_get_register,
.set_register = ab8500_set_register,
.get_register_page = NULL,
.set_register_page = NULL,
.mask_and_set_register = ab8500_mask_and_set_register,
.event_registers_startup_state_get = NULL,
.startup_irq_enabled = NULL,
};
static void ab8500_irq_lock(unsigned int irq)
{
struct ab8500 *ab8500 = get_irq_chip_data(irq);
mutex_lock(&ab8500->irq_lock);
}
static void ab8500_irq_sync_unlock(unsigned int irq)
{
struct ab8500 *ab8500 = get_irq_chip_data(irq);
int i;
for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
u8 old = ab8500->oldmask[i];
u8 new = ab8500->mask[i];
int reg;
if (new == old)
continue;
ab8500->oldmask[i] = new;
reg = AB8500_IT_MASK1_REG + ab8500_irq_regoffset[i];
set_register_interruptible(ab8500, AB8500_INTERRUPT, reg, new);
}
mutex_unlock(&ab8500->irq_lock);
}
static void ab8500_irq_mask(unsigned int irq)
{
struct ab8500 *ab8500 = get_irq_chip_data(irq);
int offset = irq - ab8500->irq_base;
int index = offset / 8;
int mask = 1 << (offset % 8);
ab8500->mask[index] |= mask;
}
static void ab8500_irq_unmask(unsigned int irq)
{
struct ab8500 *ab8500 = get_irq_chip_data(irq);
int offset = irq - ab8500->irq_base;
int index = offset / 8;
int mask = 1 << (offset % 8);
ab8500->mask[index] &= ~mask;
}
static struct irq_chip ab8500_irq_chip = {
.name = "ab8500",
.bus_lock = ab8500_irq_lock,
.bus_sync_unlock = ab8500_irq_sync_unlock,
.mask = ab8500_irq_mask,
.unmask = ab8500_irq_unmask,
};
static irqreturn_t ab8500_irq(int irq, void *dev)
{
struct ab8500 *ab8500 = dev;
int i;
dev_vdbg(ab8500->dev, "interrupt\n");
for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
int regoffset = ab8500_irq_regoffset[i];
int status;
u8 value;
status = get_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_LATCH1_REG + regoffset, &value);
if (status < 0 || value == 0)
continue;
do {
int bit = __ffs(value);
int line = i * 8 + bit;
handle_nested_irq(ab8500->irq_base + line);
value &= ~(1 << bit);
} while (value);
}
return IRQ_HANDLED;
}
static int ab8500_irq_init(struct ab8500 *ab8500)
{
int base = ab8500->irq_base;
int irq;
for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
set_irq_chip_data(irq, ab8500);
set_irq_chip_and_handler(irq, &ab8500_irq_chip,
handle_simple_irq);
set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
set_irq_noprobe(irq);
#endif
}
return 0;
}
static void ab8500_irq_remove(struct ab8500 *ab8500)
{
int base = ab8500->irq_base;
int irq;
for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
#ifdef CONFIG_ARM
set_irq_flags(irq, 0);
#endif
set_irq_chip_and_handler(irq, NULL, NULL);
set_irq_chip_data(irq, NULL);
}
}
static struct resource ab8500_gpadc_resources[] = {
{
.name = "HW_CONV_END",
.start = AB8500_INT_GP_HW_ADC_CONV_END,
.end = AB8500_INT_GP_HW_ADC_CONV_END,
.flags = IORESOURCE_IRQ,
},
{
.name = "SW_CONV_END",
.start = AB8500_INT_GP_SW_ADC_CONV_END,
.end = AB8500_INT_GP_SW_ADC_CONV_END,
.flags = IORESOURCE_IRQ,
},
};
static struct resource ab8500_rtc_resources[] = {
{
.name = "60S",
.start = AB8500_INT_RTC_60S,
.end = AB8500_INT_RTC_60S,
.flags = IORESOURCE_IRQ,
},
{
.name = "ALARM",
.start = AB8500_INT_RTC_ALARM,
.end = AB8500_INT_RTC_ALARM,
.flags = IORESOURCE_IRQ,
},
};
static struct resource ab8500_poweronkey_db_resources[] = {
{
.name = "ONKEY_DBF",
.start = AB8500_INT_PON_KEY1DB_F,
.end = AB8500_INT_PON_KEY1DB_F,
.flags = IORESOURCE_IRQ,
},
{
.name = "ONKEY_DBR",
.start = AB8500_INT_PON_KEY1DB_R,
.end = AB8500_INT_PON_KEY1DB_R,
.flags = IORESOURCE_IRQ,
},
};
static struct mfd_cell ab8500_devs[] = {
#ifdef CONFIG_DEBUG_FS
{
.name = "ab8500-debug",
},
#endif
{
.name = "ab8500-gpadc",
.num_resources = ARRAY_SIZE(ab8500_gpadc_resources),
.resources = ab8500_gpadc_resources,
},
{
.name = "ab8500-rtc",
.num_resources = ARRAY_SIZE(ab8500_rtc_resources),
.resources = ab8500_rtc_resources,
},
{
.name = "ab8500-pwm",
.id = 1,
},
{
.name = "ab8500-pwm",
.id = 2,
},
{
.name = "ab8500-pwm",
.id = 3,
},
{ .name = "ab8500-charger", },
{ .name = "ab8500-audio", },
{ .name = "ab8500-usb", },
{ .name = "ab8500-regulator", },
{
.name = "ab8500-poweron-key",
.num_resources = ARRAY_SIZE(ab8500_poweronkey_db_resources),
.resources = ab8500_poweronkey_db_resources,
},
};
static ssize_t show_chip_id(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ab8500 *ab8500;
ab8500 = dev_get_drvdata(dev);
return sprintf(buf, "%#x\n", ab8500 ? ab8500->chip_id : -EINVAL);
}
static DEVICE_ATTR(chip_id, S_IRUGO, show_chip_id, NULL);
static struct attribute *ab8500_sysfs_entries[] = {
&dev_attr_chip_id.attr,
NULL,
};
static struct attribute_group ab8500_attr_group = {
.attrs = ab8500_sysfs_entries,
};
int __devinit ab8500_init(struct ab8500 *ab8500)
{
struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
int ret;
int i;
u8 value;
if (plat)
ab8500->irq_base = plat->irq_base;
mutex_init(&ab8500->lock);
mutex_init(&ab8500->irq_lock);
ret = get_register_interruptible(ab8500, AB8500_MISC,
AB8500_REV_REG, &value);
if (ret < 0)
return ret;
/*
* 0x0 - Early Drop
* 0x10 - Cut 1.0
* 0x11 - Cut 1.1
*/
if (value == 0x0 || value == 0x10 || value == 0x11) {
ab8500->revision = value;
dev_info(ab8500->dev, "detected chip, revision: %#x\n", value);
} else {
dev_err(ab8500->dev, "unknown chip, revision: %#x\n", value);
return -EINVAL;
}
ab8500->chip_id = value;
if (plat && plat->init)
plat->init(ab8500);
/* Clear and mask all interrupts */
for (i = 0; i < 10; i++) {
get_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_LATCH1_REG + i, &value);
set_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_MASK1_REG + i, 0xff);
}
for (i = 18; i < 24; i++) {
get_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_LATCH1_REG + i, &value);
set_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_MASK1_REG + i, 0xff);
}
ret = abx500_register_ops(ab8500->dev, &ab8500_ops);
if (ret)
return ret;
for (i = 0; i < AB8500_NUM_IRQ_REGS; i++)
ab8500->mask[i] = ab8500->oldmask[i] = 0xff;
if (ab8500->irq_base) {
ret = ab8500_irq_init(ab8500);
if (ret)
return ret;
ret = request_threaded_irq(ab8500->irq, NULL, ab8500_irq,
IRQF_ONESHOT | IRQF_NO_SUSPEND,
"ab8500", ab8500);
if (ret)
goto out_removeirq;
}
ret = mfd_add_devices(ab8500->dev, 0, ab8500_devs,
ARRAY_SIZE(ab8500_devs), NULL,
ab8500->irq_base);
if (ret)
goto out_freeirq;
ret = sysfs_create_group(&ab8500->dev->kobj, &ab8500_attr_group);
if (ret)
dev_err(ab8500->dev, "error creating sysfs entries\n");
return ret;
out_freeirq:
if (ab8500->irq_base) {
free_irq(ab8500->irq, ab8500);
out_removeirq:
ab8500_irq_remove(ab8500);
}
return ret;
}
int __devexit ab8500_exit(struct ab8500 *ab8500)
{
sysfs_remove_group(&ab8500->dev->kobj, &ab8500_attr_group);
mfd_remove_devices(ab8500->dev);
if (ab8500->irq_base) {
free_irq(ab8500->irq, ab8500);
ab8500_irq_remove(ab8500);
}
return 0;
}
MODULE_AUTHOR("Srinidhi Kasagar, Rabin Vincent");
MODULE_DESCRIPTION("AB8500 MFD core");
MODULE_LICENSE("GPL v2");
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