/*
* Base driver for Maxim MAX8925
*
* Copyright (C) 2009-2010 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8925.h>
static struct resource backlight_resources[] = {
{
.name = "max8925-backlight",
.start = MAX8925_WLED_MODE_CNTL,
.end = MAX8925_WLED_CNTL,
.flags = IORESOURCE_IO,
},
};
static struct mfd_cell backlight_devs[] = {
{
.name = "max8925-backlight",
.num_resources = 1,
.resources = &backlight_resources[0],
.id = -1,
},
};
static struct resource touch_resources[] = {
{
.name = "max8925-tsc",
.start = MAX8925_TSC_IRQ,
.end = MAX8925_ADC_RES_END,
.flags = IORESOURCE_IO,
},
};
static struct mfd_cell touch_devs[] = {
{
.name = "max8925-touch",
.num_resources = 1,
.resources = &touch_resources[0],
.id = -1,
},
};
static struct resource power_supply_resources[] = {
{
.name = "max8925-power",
.start = MAX8925_CHG_IRQ1,
.end = MAX8925_CHG_IRQ1_MASK,
.flags = IORESOURCE_IO,
},
};
static struct mfd_cell power_devs[] = {
{
.name = "max8925-power",
.num_resources = 1,
.resources = &power_supply_resources[0],
.id = -1,
},
};
static struct resource rtc_resources[] = {
{
.name = "max8925-rtc",
.start = MAX8925_RTC_IRQ,
.end = MAX8925_RTC_IRQ_MASK,
.flags = IORESOURCE_IO,
},
};
static struct mfd_cell rtc_devs[] = {
{
.name = "max8925-rtc",
.num_resources = 1,
.resources = &rtc_resources[0],
.id = -1,
},
};
#define MAX8925_REG_RESOURCE(_start, _end) \
{ \
.start = MAX8925_##_start, \
.end = MAX8925_##_end, \
.flags = IORESOURCE_IO, \
}
static struct resource regulator_resources[] = {
MAX8925_REG_RESOURCE(SDCTL1, SDCTL1),
MAX8925_REG_RESOURCE(SDCTL2, SDCTL2),
MAX8925_REG_RESOURCE(SDCTL3, SDCTL3),
MAX8925_REG_RESOURCE(LDOCTL1, LDOCTL1),
MAX8925_REG_RESOURCE(LDOCTL2, LDOCTL2),
MAX8925_REG_RESOURCE(LDOCTL3, LDOCTL3),
MAX8925_REG_RESOURCE(LDOCTL4, LDOCTL4),
MAX8925_REG_RESOURCE(LDOCTL5, LDOCTL5),
MAX8925_REG_RESOURCE(LDOCTL6, LDOCTL6),
MAX8925_REG_RESOURCE(LDOCTL7, LDOCTL7),
MAX8925_REG_RESOURCE(LDOCTL8, LDOCTL8),
MAX8925_REG_RESOURCE(LDOCTL9, LDOCTL9),
MAX8925_REG_RESOURCE(LDOCTL10, LDOCTL10),
MAX8925_REG_RESOURCE(LDOCTL11, LDOCTL11),
MAX8925_REG_RESOURCE(LDOCTL12, LDOCTL12),
MAX8925_REG_RESOURCE(LDOCTL13, LDOCTL13),
MAX8925_REG_RESOURCE(LDOCTL14, LDOCTL14),
MAX8925_REG_RESOURCE(LDOCTL15, LDOCTL15),
MAX8925_REG_RESOURCE(LDOCTL16, LDOCTL16),
MAX8925_REG_RESOURCE(LDOCTL17, LDOCTL17),
MAX8925_REG_RESOURCE(LDOCTL18, LDOCTL18),
MAX8925_REG_RESOURCE(LDOCTL19, LDOCTL19),
MAX8925_REG_RESOURCE(LDOCTL20, LDOCTL20),
};
#define MAX8925_REG_DEVS(_id) \
{ \
.name = "max8925-regulator", \
.num_resources = 1, \
.resources = ®ulator_resources[MAX8925_ID_##_id], \
.id = MAX8925_ID_##_id, \
}
static struct mfd_cell regulator_devs[] = {
MAX8925_REG_DEVS(SD1),
MAX8925_REG_DEVS(SD2),
MAX8925_REG_DEVS(SD3),
MAX8925_REG_DEVS(LDO1),
MAX8925_REG_DEVS(LDO2),
MAX8925_REG_DEVS(LDO3),
MAX8925_REG_DEVS(LDO4),
MAX8925_REG_DEVS(LDO5),
MAX8925_REG_DEVS(LDO6),
MAX8925_REG_DEVS(LDO7),
MAX8925_REG_DEVS(LDO8),
MAX8925_REG_DEVS(LDO9),
MAX8925_REG_DEVS(LDO10),
MAX8925_REG_DEVS(LDO11),
MAX8925_REG_DEVS(LDO12),
MAX8925_REG_DEVS(LDO13),
MAX8925_REG_DEVS(LDO14),
MAX8925_REG_DEVS(LDO15),
MAX8925_REG_DEVS(LDO16),
MAX8925_REG_DEVS(LDO17),
MAX8925_REG_DEVS(LDO18),
MAX8925_REG_DEVS(LDO19),
MAX8925_REG_DEVS(LDO20),
};
enum {
FLAGS_ADC = 1, /* register in ADC component */
FLAGS_RTC, /* register in RTC component */
};
struct max8925_irq_data {
int reg;
int mask_reg;
int enable; /* enable or not */
int offs; /* bit offset in mask register */
int flags;
int tsc_irq;
};
static struct max8925_irq_data max8925_irqs[] = {
[MAX8925_IRQ_VCHG_DC_OVP] = {
.reg = MAX8925_CHG_IRQ1,
.mask_reg = MAX8925_CHG_IRQ1_MASK,
.offs = 1 << 0,
},
[MAX8925_IRQ_VCHG_DC_F] = {
.reg = MAX8925_CHG_IRQ1,
.mask_reg = MAX8925_CHG_IRQ1_MASK,
.offs = 1 << 1,
},
[MAX8925_IRQ_VCHG_DC_R] = {
.reg = MAX8925_CHG_IRQ1,
.mask_reg = MAX8925_CHG_IRQ1_MASK,
.offs = 1 << 2,
},
[MAX8925_IRQ_VCHG_USB_OVP] = {
.reg = MAX8925_CHG_IRQ1,
.mask_reg = MAX8925_CHG_IRQ1_MASK,
.offs = 1 << 3,
},
[MAX8925_IRQ_VCHG_USB_F] = {
.reg = MAX8925_CHG_IRQ1,
.mask_reg = MAX8925_CHG_IRQ1_MASK,
.offs = 1 << 4,
},
[MAX8925_IRQ_VCHG_USB_R] = {
.reg = MAX8925_CHG_IRQ1,
.mask_reg = MAX8925_CHG_IRQ1_MASK,
.offs = 1 << 5,
},
[MAX8925_IRQ_VCHG_THM_OK_R] = {
.reg = MAX8925_CHG_IRQ2,
.mask_reg = MAX8925_CHG_IRQ2_MASK,
.offs = 1 << 0,
},
[MAX8925_IRQ_VCHG_THM_OK_F] = {
.reg = MAX8925_CHG_IRQ2,
.mask_reg = MAX8925_CHG_IRQ2_MASK,
.offs = 1 << 1,
},
[MAX8925_IRQ_VCHG_SYSLOW_F] = {
.reg = MAX8925_CHG_IRQ2,
.mask_reg = MAX8925_CHG_IRQ2_MASK,
.offs = 1 << 2,
},
[MAX8925_IRQ_VCHG_SYSLOW_R] = {
.reg = MAX8925_CHG_IRQ2,
.mask_reg = MAX8925_CHG_IRQ2_MASK,
.offs = 1 << 3,
},
[MAX8925_IRQ_VCHG_RST] = {
.reg = MAX8925_CHG_IRQ2,
.mask_reg = MAX8925_CHG_IRQ2_MASK,
.offs = 1 << 4,
},
[MAX8925_IRQ_VCHG_DONE] = {
.reg = MAX8925_CHG_IRQ2,
.mask_reg = MAX8925_CHG_IRQ2_MASK,
.offs = 1 << 5,
},
[MAX8925_IRQ_VCHG_TOPOFF] = {
.reg = MAX8925_CHG_IRQ2,
.mask_reg = MAX8925_CHG_IRQ2_MASK,
.offs = 1 << 6,
},
[MAX8925_IRQ_VCHG_TMR_FAULT] = {
.reg = MAX8925_CHG_IRQ2,
.mask_reg = MAX8925_CHG_IRQ2_MASK,
.offs = 1 << 7,
},
[MAX8925_IRQ_GPM_RSTIN] = {
.reg = MAX8925_ON_OFF_IRQ1,
.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
.offs = 1 << 0,
},
[MAX8925_IRQ_GPM_MPL] = {
.reg = MAX8925_ON_OFF_IRQ1,
.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
.offs = 1 << 1,
},
[MAX8925_IRQ_GPM_SW_3SEC] = {
.reg = MAX8925_ON_OFF_IRQ1,
.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
.offs = 1 << 2,
},
[MAX8925_IRQ_GPM_EXTON_F] = {
.reg = MAX8925_ON_OFF_IRQ1,
.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
.offs = 1 << 3,
},
[MAX8925_IRQ_GPM_EXTON_R] = {
.reg = MAX8925_ON_OFF_IRQ1,
.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
.offs = 1 << 4,
},
[MAX8925_IRQ_GPM_SW_1SEC] = {
.reg = MAX8925_ON_OFF_IRQ1,
.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
.offs = 1 << 5,
},
[MAX8925_IRQ_GPM_SW_F] = {
.reg = MAX8925_ON_OFF_IRQ1,
.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
.offs = 1 << 6,
},
[MAX8925_IRQ_GPM_SW_R] = {
.reg = MAX8925_ON_OFF_IRQ1,
.mask_reg = MAX8925_ON_OFF_IRQ1_MASK,
.offs = 1 << 7,
},
[MAX8925_IRQ_GPM_SYSCKEN_F] = {
.reg = MAX8925_ON_OFF_IRQ2,
.mask_reg = MAX8925_ON_OFF_IRQ2_MASK,
.offs = 1 << 0,
},
[MAX8925_IRQ_GPM_SYSCKEN_R] = {
.reg = MAX8925_ON_OFF_IRQ2,
.mask_reg = MAX8925_ON_OFF_IRQ2_MASK,
.offs = 1 << 1,
},
[MAX8925_IRQ_RTC_ALARM1] = {
.reg = MAX8925_RTC_IRQ,
.mask_reg = MAX8925_RTC_IRQ_MASK,
.offs = 1 << 2,
.flags = FLAGS_RTC,
},
[MAX8925_IRQ_RTC_ALARM0] = {
.reg = MAX8925_RTC_IRQ,
.mask_reg = MAX8925_RTC_IRQ_MASK,
.offs = 1 << 3,
.flags = FLAGS_RTC,
},
[MAX8925_IRQ_TSC_STICK] = {
.reg = MAX8925_TSC_IRQ,
.mask_reg = MAX8925_TSC_IRQ_MASK,
.offs = 1 << 0,
.flags = FLAGS_ADC,
.tsc_irq = 1,
},
[MAX8925_IRQ_TSC_NSTICK] = {
.reg = MAX8925_TSC_IRQ,
.mask_reg = MAX8925_TSC_IRQ_MASK,
.offs = 1 << 1,
.flags = FLAGS_ADC,
.tsc_irq = 1,
},
};
static inline struct max8925_irq_data *irq_to_max8925(struct max8925_chip *chip,
int irq)
{
return &max8925_irqs[irq - chip->irq_base];
}
static irqreturn_t max8925_irq(int irq, void *data)
{
struct max8925_chip *chip = data;
struct max8925_irq_data *irq_data;
struct i2c_client *i2c;
int read_reg = -1, value = 0;
int i;
for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
irq_data = &max8925_irqs[i];
/* TSC IRQ should be serviced in max8925_tsc_irq() */
if (irq_data->tsc_irq)
continue;
if (irq_data->flags == FLAGS_RTC)
i2c = chip->rtc;
else if (irq_data->flags == FLAGS_ADC)
i2c = chip->adc;
else
i2c = chip->i2c;
if (read_reg != irq_data->reg) {
read_reg = irq_data->reg;
value = max8925_reg_read(i2c, irq_data->reg);
}
if (value & irq_data->enable)
handle_nested_irq(chip->irq_base + i);
}
return IRQ_HANDLED;
}
static irqreturn_t max8925_tsc_irq(int irq, void *data)
{
struct max8925_chip *chip = data;
struct max8925_irq_data *irq_data;
struct i2c_client *i2c;
int read_reg = -1, value = 0;
int i;
for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
irq_data = &max8925_irqs[i];
/* non TSC IRQ should be serviced in max8925_irq() */
if (!irq_data->tsc_irq)
continue;
if (irq_data->flags == FLAGS_RTC)
i2c = chip->rtc;
else if (irq_data->flags == FLAGS_ADC)
i2c = chip->adc;
else
i2c = chip->i2c;
if (read_reg != irq_data->reg) {
read_reg = irq_data->reg;
value = max8925_reg_read(i2c, irq_data->reg);
}
if (value & irq_data->enable)
handle_nested_irq(chip->irq_base + i);
}
return IRQ_HANDLED;
}
static void max8925_irq_lock(unsigned int irq)
{
struct max8925_chip *chip = get_irq_chip_data(irq);
mutex_lock(&chip->irq_lock);
}
static void max8925_irq_sync_unlock(unsigned int irq)
{
struct max8925_chip *chip = get_irq_chip_data(irq);
struct max8925_irq_data *irq_data;
static unsigned char cache_chg[2] = {0xff, 0xff};
static unsigned char cache_on[2] = {0xff, 0xff};
static unsigned char cache_rtc = 0xff, cache_tsc = 0xff;
unsigned char irq_chg[2], irq_on[2];
unsigned char irq_rtc, irq_tsc;
int i;
/* Load cached value. In initial, all IRQs are masked */
irq_chg[0] = cache_chg[0];
irq_chg[1] = cache_chg[1];
irq_on[0] = cache_on[0];
irq_on[1] = cache_on[1];
irq_rtc = cache_rtc;
irq_tsc = cache_tsc;
for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
irq_data = &max8925_irqs[i];
switch (irq_data->mask_reg) {
case MAX8925_CHG_IRQ1_MASK:
irq_chg[0] &= irq_data->enable;
break;
case MAX8925_CHG_IRQ2_MASK:
irq_chg[1] &= irq_data->enable;
break;
case MAX8925_ON_OFF_IRQ1_MASK:
irq_on[0] &= irq_data->enable;
break;
case MAX8925_ON_OFF_IRQ2_MASK:
irq_on[1] &= irq_data->enable;
break;
case MAX8925_RTC_IRQ_MASK:
irq_rtc &= irq_data->enable;
break;
case MAX8925_TSC_IRQ_MASK:
irq_tsc &= irq_data->enable;
break;
default:
dev_err(chip->dev, "wrong IRQ\n");
break;
}
}
/* update mask into registers */
if (cache_chg[0] != irq_chg[0]) {
cache_chg[0] = irq_chg[0];
max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ1_MASK,
irq_chg[0]);
}
if (cache_chg[1] != irq_chg[1]) {
cache_chg[1] = irq_chg[1];
max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ2_MASK,
irq_chg[1]);
}
if (cache_on[0] != irq_on[0]) {
cache_on[0] = irq_on[0];
max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ1_MASK,
irq_on[0]);
}
if (cache_on[1] != irq_on[1]) {
cache_on[1] = irq_on[1];
max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ2_MASK,
irq_on[1]);
}
if (cache_rtc != irq_rtc) {
cache_rtc = irq_rtc;
max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, irq_rtc);
}
if (cache_tsc != irq_tsc) {
cache_tsc = irq_tsc;
max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, irq_tsc);
}
mutex_unlock(&chip->irq_lock);
}
static void max8925_irq_enable(unsigned int irq)
{
struct max8925_chip *chip = get_irq_chip_data(irq);
max8925_irqs[irq - chip->irq_base].enable
= max8925_irqs[irq - chip->irq_base].offs;
}
static void max8925_irq_disable(unsigned int irq)
{
struct max8925_chip *chip = get_irq_chip_data(irq);
max8925_irqs[irq - chip->irq_base].enable = 0;
}
static struct irq_chip max8925_irq_chip = {
.name = "max8925",
.bus_lock = max8925_irq_lock,
.bus_sync_unlock = max8925_irq_sync_unlock,
.enable = max8925_irq_enable,
.disable = max8925_irq_disable,
};
static int max8925_irq_init(struct max8925_chip *chip, int irq,
struct max8925_platform_data *pdata)
{
unsigned long flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
struct irq_desc *desc;
int i, ret;
int __irq;
if (!pdata || !pdata->irq_base) {
dev_warn(chip->dev, "No interrupt support on IRQ base\n");
return -EINVAL;
}
/* clear all interrupts */
max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ1);
max8925_reg_read(chip->i2c, MAX8925_CHG_IRQ2);
max8925_reg_read(chip->i2c, MAX8925_ON_OFF_IRQ1);
max8925_reg_read(chip->i2c, MAX8925_ON_OFF_IRQ2);
max8925_reg_read(chip->rtc, MAX8925_RTC_IRQ);
max8925_reg_read(chip->adc, MAX8925_TSC_IRQ);
/* mask all interrupts except for TSC */
max8925_reg_write(chip->rtc, MAX8925_ALARM0_CNTL, 0);
max8925_reg_write(chip->rtc, MAX8925_ALARM1_CNTL, 0);
max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ1_MASK, 0xff);
max8925_reg_write(chip->i2c, MAX8925_CHG_IRQ2_MASK, 0xff);
max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff);
max8925_reg_write(chip->i2c, MAX8925_ON_OFF_IRQ2_MASK, 0xff);
max8925_reg_write(chip->rtc, MAX8925_RTC_IRQ_MASK, 0xff);
mutex_init(&chip->irq_lock);
chip->core_irq = irq;
chip->irq_base = pdata->irq_base;
desc = irq_to_desc(chip->core_irq);
/* register with genirq */
for (i = 0; i < ARRAY_SIZE(max8925_irqs); i++) {
__irq = i + chip->irq_base;
set_irq_chip_data(__irq, chip);
set_irq_chip_and_handler(__irq, &max8925_irq_chip,
handle_edge_irq);
set_irq_nested_thread(__irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(__irq, IRQF_VALID);
#else
set_irq_noprobe(__irq);
#endif
}
if (!irq) {
dev_warn(chip->dev, "No interrupt support on core IRQ\n");
goto tsc_irq;
}
ret = request_threaded_irq(irq, NULL, max8925_irq, flags,
"max8925", chip);
if (ret) {
dev_err(chip->dev, "Failed to request core IRQ: %d\n", ret);
chip->core_irq = 0;
}
tsc_irq:
/* mask TSC interrupt */
max8925_reg_write(chip->adc, MAX8925_TSC_IRQ_MASK, 0x0f);
if (!pdata->tsc_irq) {
dev_warn(chip->dev, "No interrupt support on TSC IRQ\n");
return 0;
}
chip->tsc_irq = pdata->tsc_irq;
ret = request_threaded_irq(chip->tsc_irq, NULL, max8925_tsc_irq,
flags, "max8925-tsc", chip);
if (ret) {
dev_err(chip->dev, "Failed to request TSC IRQ: %d\n", ret);
chip->tsc_irq = 0;
}
return 0;
}
int __devinit max8925_device_init(struct max8925_chip *chip,
struct max8925_platform_data *pdata)
{
int ret;
max8925_irq_init(chip, chip->i2c->irq, pdata);
if (pdata && (pdata->power || pdata->touch)) {
/* enable ADC to control internal reference */
max8925_set_bits(chip->i2c, MAX8925_RESET_CNFG, 1, 1);
/* enable internal reference for ADC */
max8925_set_bits(chip->adc, MAX8925_TSC_CNFG1, 3, 2);
/* check for internal reference IRQ */
do {
ret = max8925_reg_read(chip->adc, MAX8925_TSC_IRQ);
} while (ret & MAX8925_NREF_OK);
/* enaable ADC scheduler, interval is 1 second */
max8925_set_bits(chip->adc, MAX8925_ADC_SCHED, 3, 2);
}
/* enable Momentary Power Loss */
max8925_set_bits(chip->rtc, MAX8925_MPL_CNTL, 1 << 4, 1 << 4);
ret = mfd_add_devices(chip->dev, 0, &rtc_devs[0],
ARRAY_SIZE(rtc_devs),
&rtc_resources[0], 0);
if (ret < 0) {
dev_err(chip->dev, "Failed to add rtc subdev\n");
goto out;
}
if (pdata && pdata->regulator[0]) {
ret = mfd_add_devices(chip->dev, 0, ®ulator_devs[0],
ARRAY_SIZE(regulator_devs),
®ulator_resources[0], 0);
if (ret < 0) {
dev_err(chip->dev, "Failed to add regulator subdev\n");
goto out_dev;
}
}
if (pdata && pdata->backlight) {
ret = mfd_add_devices(chip->dev, 0, &backlight_devs[0],
ARRAY_SIZE(backlight_devs),
&backlight_resources[0], 0);
if (ret < 0) {
dev_err(chip->dev, "Failed to add backlight subdev\n");
goto out_dev;
}
}
if (pdata && pdata->power) {
ret = mfd_add_devices(chip->dev, 0, &power_devs[0],
ARRAY_SIZE(power_devs),
&power_supply_resources[0], 0);
if (ret < 0) {
dev_err(chip->dev, "Failed to add power supply "
"subdev\n");
goto out_dev;
}
}
if (pdata && pdata->touch) {
ret = mfd_add_devices(chip->dev, 0, &touch_devs[0],
ARRAY_SIZE(touch_devs),
&touch_resources[0], 0);
if (ret < 0) {
dev_err(chip->dev, "Failed to add touch subdev\n");
goto out_dev;
}
}
return 0;
out_dev:
mfd_remove_devices(chip->dev);
out:
return ret;
}
void __devexit max8925_device_exit(struct max8925_chip *chip)
{
if (chip->core_irq)
free_irq(chip->core_irq, chip);
if (chip->tsc_irq)
free_irq(chip->tsc_irq, chip);
mfd_remove_devices(chip->dev);
}
MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com");
MODULE_LICENSE("GPL");
