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mfd: Initial max8925 support

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Basic Max8925 support, which is a power management IC from Maxim
Semiconductor.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Haojian Zhuang 2010-01-08 12:29:23 +01:00 committed by Samuel Ortiz
parent 34a4b2391e
commit d50f8f339f
5 changed files with 602 additions and 0 deletions
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9
drivers/mfd/Kconfig
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@ -194,6 +194,15 @@ config PMIC_ADP5520
individual components like LCD backlight, LEDs, GPIOs and Kepad
under the corresponding menus.
config MFD_MAX8925
tristate "Maxim Semiconductor MAX8925 PMIC Support"
depends on I2C
help
Say yes here to support for Maxim Semiconductor MAX8925. This is
a Power Management IC. This driver provies common support for
accessing the device, additional drivers must be enabled in order
to use the functionality of the device.
config MFD_WM8400
tristate "Support Wolfson Microelectronics WM8400"
select MFD_CORE

2
drivers/mfd/Makefile
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@ -49,6 +49,8 @@ endif
obj-$(CONFIG_UCB1400_CORE) += ucb1400_core.o
obj-$(CONFIG_PMIC_DA903X) += da903x.o
max8925-objs := max8925-core.o max8925-i2c.o
obj-$(CONFIG_MFD_MAX8925) += max8925.o
obj-$(CONFIG_MFD_PCF50633) += pcf50633-core.o
obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o

262
drivers/mfd/max8925-core.c Normal file
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@ -0,0 +1,262 @@
/*
* Base driver for Maxim MAX8925
*
* Copyright (C) 2009 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/interrupt.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/max8925.h>
#define IRQ_MODE_STATUS 0
#define IRQ_MODE_MASK 1
static int __get_irq_offset(struct max8925_chip *chip, int irq, int mode,
int *offset, int *bit)
{
if (!offset || !bit)
return -EINVAL;
switch (chip->chip_id) {
case MAX8925_GPM:
*bit = irq % BITS_PER_BYTE;
if (irq < (BITS_PER_BYTE << 1)) { /* irq = [0,15] */
*offset = (mode) ? MAX8925_CHG_IRQ1_MASK
: MAX8925_CHG_IRQ1;
if (irq >= BITS_PER_BYTE)
(*offset)++;
} else { /* irq = [16,31] */
*offset = (mode) ? MAX8925_ON_OFF_IRQ1_MASK
: MAX8925_ON_OFF_IRQ1;
if (irq >= (BITS_PER_BYTE * 3))
(*offset)++;
}
break;
case MAX8925_ADC:
*bit = irq % BITS_PER_BYTE;
*offset = (mode) ? MAX8925_TSC_IRQ_MASK : MAX8925_TSC_IRQ;
break;
default:
goto out;
}
return 0;
out:
dev_err(chip->dev, "Wrong irq #%d is assigned\n", irq);
return -EINVAL;
}
static int __check_irq(int irq)
{
if ((irq < 0) || (irq >= MAX8925_NUM_IRQ))
return -EINVAL;
return 0;
}
int max8925_mask_irq(struct max8925_chip *chip, int irq)
{
int offset, bit, ret;
ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
if (ret < 0)
return ret;
ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 1 << bit);
return ret;
}
int max8925_unmask_irq(struct max8925_chip *chip, int irq)
{
int offset, bit, ret;
ret = __get_irq_offset(chip, irq, IRQ_MODE_MASK, &offset, &bit);
if (ret < 0)
return ret;
ret = max8925_set_bits(chip->i2c, offset, 1 << bit, 0);
return ret;
}
#define INT_STATUS_NUM (MAX8925_NUM_IRQ / BITS_PER_BYTE)
static irqreturn_t max8925_irq_thread(int irq, void *data)
{
struct max8925_chip *chip = data;
unsigned long irq_status[INT_STATUS_NUM];
unsigned char status_buf[INT_STATUS_NUM << 1];
int i, ret;
memset(irq_status, 0, sizeof(unsigned long) * INT_STATUS_NUM);
/* all these interrupt status registers are read-only */
switch (chip->chip_id) {
case MAX8925_GPM:
ret = max8925_bulk_read(chip->i2c, MAX8925_CHG_IRQ1,
4, status_buf);
if (ret < 0)
goto out;
ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ1,
2, &status_buf[4]);
if (ret < 0)
goto out;
ret = max8925_bulk_read(chip->i2c, MAX8925_ON_OFF_IRQ2,
2, &status_buf[6]);
if (ret < 0)
goto out;
/* clear masked interrupt status */
status_buf[0] &= (~status_buf[2] & CHG_IRQ1_MASK);
irq_status[0] |= status_buf[0];
status_buf[1] &= (~status_buf[3] & CHG_IRQ2_MASK);
irq_status[0] |= (status_buf[1] << BITS_PER_BYTE);
status_buf[4] &= (~status_buf[5] & ON_OFF_IRQ1_MASK);
irq_status[0] |= (status_buf[4] << (BITS_PER_BYTE * 2));
status_buf[6] &= (~status_buf[7] & ON_OFF_IRQ2_MASK);
irq_status[0] |= (status_buf[6] << (BITS_PER_BYTE * 3));
break;
case MAX8925_ADC:
ret = max8925_bulk_read(chip->i2c, MAX8925_TSC_IRQ,
2, status_buf);
if (ret < 0)
goto out;
/* clear masked interrupt status */
status_buf[0] &= (~status_buf[1] & TSC_IRQ_MASK);
irq_status[0] |= status_buf[0];
break;
default:
goto out;
}
for_each_bit(i, &irq_status[0], MAX8925_NUM_IRQ) {
clear_bit(i, irq_status);
dev_dbg(chip->dev, "Servicing IRQ #%d in %s\n", i, chip->name);
mutex_lock(&chip->irq_lock);
if (chip->irq[i].handler)
chip->irq[i].handler(i, chip->irq[i].data);
else {
max8925_mask_irq(chip, i);
dev_err(chip->dev, "Noboday cares IRQ #%d in %s. "
"Now mask it.\n", i, chip->name);
}
mutex_unlock(&chip->irq_lock);
}
out:
return IRQ_HANDLED;
}
int max8925_request_irq(struct max8925_chip *chip, int irq,
irq_handler_t handler, void *data)
{
if ((__check_irq(irq) < 0) || !handler)
return -EINVAL;
mutex_lock(&chip->irq_lock);
chip->irq[irq].handler = handler;
chip->irq[irq].data = data;
mutex_unlock(&chip->irq_lock);
return 0;
}
EXPORT_SYMBOL(max8925_request_irq);
int max8925_free_irq(struct max8925_chip *chip, int irq)
{
if (__check_irq(irq) < 0)
return -EINVAL;
mutex_lock(&chip->irq_lock);
chip->irq[irq].handler = NULL;
chip->irq[irq].data = NULL;
mutex_unlock(&chip->irq_lock);
return 0;
}
EXPORT_SYMBOL(max8925_free_irq);
static int __devinit device_gpm_init(struct max8925_chip *chip,
struct i2c_client *i2c,
struct max8925_platform_data *pdata)
{
int ret;
/* mask all IRQs */
ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ1_MASK, 0x7, 0x7);
if (ret < 0)
goto out;
ret = max8925_set_bits(i2c, MAX8925_CHG_IRQ2_MASK, 0xff, 0xff);
if (ret < 0)
goto out;
ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ1_MASK, 0xff, 0xff);
if (ret < 0)
goto out;
ret = max8925_set_bits(i2c, MAX8925_ON_OFF_IRQ2_MASK, 0x3, 0x3);
if (ret < 0)
goto out;
chip->name = "GPM";
memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
IRQF_ONESHOT | IRQF_TRIGGER_LOW,
"max8925-gpm", chip);
if (ret < 0) {
dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
goto out;
}
chip->chip_irq = i2c->irq;
/* enable hard-reset for ONKEY power-off */
max8925_set_bits(i2c, MAX8925_SYSENSEL, 0x80, 0x80);
out:
return ret;
}
static int __devinit device_adc_init(struct max8925_chip *chip,
struct i2c_client *i2c,
struct max8925_platform_data *pdata)
{
int ret;
/* mask all IRQs */
ret = max8925_set_bits(i2c, MAX8925_TSC_IRQ_MASK, 3, 3);
chip->name = "ADC";
memset(chip->irq, 0, sizeof(struct max8925_irq) * MAX8925_NUM_IRQ);
ret = request_threaded_irq(i2c->irq, NULL, max8925_irq_thread,
IRQF_ONESHOT | IRQF_TRIGGER_LOW,
"max8925-adc", chip);
if (ret < 0) {
dev_err(chip->dev, "Failed to request IRQ #%d.\n", i2c->irq);
goto out;
}
chip->chip_irq = i2c->irq;
out:
return ret;
}
int __devinit max8925_device_init(struct max8925_chip *chip,
struct max8925_platform_data *pdata)
{
switch (chip->chip_id) {
case MAX8925_GPM:
device_gpm_init(chip, chip->i2c, pdata);
break;
case MAX8925_ADC:
device_adc_init(chip, chip->i2c, pdata);
break;
}
return 0;
}
void max8925_device_exit(struct max8925_chip *chip)
{
if (chip->chip_irq >= 0)
free_irq(chip->chip_irq, chip);
}
MODULE_DESCRIPTION("PMIC Driver for Maxim MAX8925");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com");
MODULE_LICENSE("GPL");

210
drivers/mfd/max8925-i2c.c Normal file
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@ -0,0 +1,210 @@
/*
* I2C driver for Maxim MAX8925
*
* Copyright (C) 2009 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/platform_device.h>
#include <linux/i2c.h>
#include <linux/mfd/max8925.h>
static inline int max8925_read_device(struct i2c_client *i2c,
int reg, int bytes, void *dest)
{
unsigned char data;
unsigned char *buf;
int ret;
buf = kzalloc(bytes + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
data = (unsigned char)reg;
ret = i2c_master_send(i2c, &data, 1);
if (ret < 0)
return ret;
ret = i2c_master_recv(i2c, buf, bytes + 1);
if (ret < 0)
return ret;
memcpy(dest, buf, bytes);
return 0;
}
static inline int max8925_write_device(struct i2c_client *i2c,
int reg, int bytes, void *src)
{
unsigned char buf[bytes + 1];
int ret;
buf[0] = (unsigned char)reg;
memcpy(&buf[1], src, bytes);
ret = i2c_master_send(i2c, buf, bytes + 1);
if (ret < 0)
return ret;
return 0;
}
int max8925_reg_read(struct i2c_client *i2c, int reg)
{
struct max8925_chip *chip = i2c_get_clientdata(i2c);
unsigned char data;
int ret;
mutex_lock(&chip->io_lock);
ret = max8925_read_device(i2c, reg, 1, &data);
mutex_unlock(&chip->io_lock);
if (ret < 0)
return ret;
else
return (int)data;
}
EXPORT_SYMBOL(max8925_reg_read);
int max8925_reg_write(struct i2c_client *i2c, int reg,
unsigned char data)
{
struct max8925_chip *chip = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&chip->io_lock);
ret = max8925_write_device(i2c, reg, 1, &data);
mutex_unlock(&chip->io_lock);
return ret;
}
EXPORT_SYMBOL(max8925_reg_write);
int max8925_bulk_read(struct i2c_client *i2c, int reg,
int count, unsigned char *buf)
{
struct max8925_chip *chip = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&chip->io_lock);
ret = max8925_read_device(i2c, reg, count, buf);
mutex_unlock(&chip->io_lock);
return ret;
}
EXPORT_SYMBOL(max8925_bulk_read);
int max8925_bulk_write(struct i2c_client *i2c, int reg,
int count, unsigned char *buf)
{
struct max8925_chip *chip = i2c_get_clientdata(i2c);
int ret;
mutex_lock(&chip->io_lock);
ret = max8925_write_device(i2c, reg, count, buf);
mutex_unlock(&chip->io_lock);
return ret;
}
EXPORT_SYMBOL(max8925_bulk_write);
int max8925_set_bits(struct i2c_client *i2c, int reg,
unsigned char mask, unsigned char data)
{
struct max8925_chip *chip = i2c_get_clientdata(i2c);
unsigned char value;
int ret;
mutex_lock(&chip->io_lock);
ret = max8925_read_device(i2c, reg, 1, &value);
if (ret < 0)
goto out;
value &= ~mask;
value |= data;
ret = max8925_write_device(i2c, reg, 1, &value);
out:
mutex_unlock(&chip->io_lock);
return ret;
}
EXPORT_SYMBOL(max8925_set_bits);
static const struct i2c_device_id max8925_id_table[] = {
{ "max8925", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, max8925_id_table);
static int __devinit max8925_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct max8925_platform_data *pdata = client->dev.platform_data;
struct max8925_chip *chip;
if (!pdata) {
pr_info("%s: platform data is missing\n", __func__);
return -EINVAL;
}
if ((pdata->chip_id <= MAX8925_INVALID)
|| (pdata->chip_id >= MAX8925_MAX)) {
pr_info("#%s: wrong chip identification\n", __func__);
return -EINVAL;
}
chip = kzalloc(sizeof(struct max8925_chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
chip->i2c = client;
chip->chip_id = pdata->chip_id;
i2c_set_clientdata(client, chip);
chip->dev = &client->dev;
mutex_init(&chip->io_lock);
dev_set_drvdata(chip->dev, chip);
max8925_device_init(chip, pdata);
return 0;
}
static int __devexit max8925_remove(struct i2c_client *client)
{
struct max8925_chip *chip = i2c_get_clientdata(client);
max8925_device_exit(chip);
i2c_set_clientdata(client, NULL);
kfree(chip);
return 0;
}
static struct i2c_driver max8925_driver = {
.driver = {
.name = "max8925",
.owner = THIS_MODULE,
},
.probe = max8925_probe,
.remove = __devexit_p(max8925_remove),
.id_table = max8925_id_table,
};
static int __init max8925_i2c_init(void)
{
int ret;
ret = i2c_add_driver(&max8925_driver);
if (ret != 0)
pr_err("Failed to register MAX8925 I2C driver: %d\n", ret);
return ret;
}
subsys_initcall(max8925_i2c_init);
static void __exit max8925_i2c_exit(void)
{
i2c_del_driver(&max8925_driver);
}
module_exit(max8925_i2c_exit);
MODULE_DESCRIPTION("I2C Driver for Maxim 8925");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");

119
include/linux/mfd/max8925.h Normal file
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@ -0,0 +1,119 @@
/*
* Maxim8925 Interface
*
* Copyright (C) 2009 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.
*/
#ifndef __LINUX_MFD_MAX8925_H
#define __LINUX_MFD_MAX8925_H
#include <linux/interrupt.h>
/* Charger registers */
#define MAX8925_CHG_IRQ1 (0x7e)
#define MAX8925_CHG_IRQ2 (0x7f)
#define MAX8925_CHG_IRQ1_MASK (0x80)
#define MAX8925_CHG_IRQ2_MASK (0x81)
/* GPM registers */
#define MAX8925_SYSENSEL (0x00)
#define MAX8925_ON_OFF_IRQ1 (0x01)
#define MAX8925_ON_OFF_IRQ1_MASK (0x02)
#define MAX8925_ON_OFF_STAT (0x03)
#define MAX8925_ON_OFF_IRQ2 (0x0d)
#define MAX8925_ON_OFF_IRQ2_MASK (0x0e)
#define MAX8925_RESET_CNFG (0x0f)
/* Touch registers */
#define MAX8925_TSC_IRQ (0x00)
#define MAX8925_TSC_IRQ_MASK (0x01)
/* RTC registers */
#define MAX8925_RTC_STATUS (0x1a)
#define MAX8925_RTC_IRQ (0x1c)
#define MAX8925_RTC_IRQ_MASK (0x1d)
/* bit definitions */
#define CHG_IRQ1_MASK (0x07)
#define CHG_IRQ2_MASK (0xff)
#define ON_OFF_IRQ1_MASK (0xff)
#define ON_OFF_IRQ2_MASK (0x03)
#define TSC_IRQ_MASK (0x03)
#define RTC_IRQ_MASK (0x0c)
#define MAX8925_NUM_IRQ (32)
#define MAX8925_NAME_SIZE (32)
enum {
MAX8925_INVALID = 0,
MAX8925_RTC,
MAX8925_ADC,
MAX8925_GPM, /* general power management */
MAX8925_MAX,
};
#define MAX8925_IRQ_VCHG_OVP (0)
#define MAX8925_IRQ_VCHG_F (1)
#define MAX8925_IRQ_VCHG_R (2)
#define MAX8925_IRQ_VCHG_THM_OK_R (8)
#define MAX8925_IRQ_VCHG_THM_OK_F (9)
#define MAX8925_IRQ_VCHG_BATTLOW_F (10)
#define MAX8925_IRQ_VCHG_BATTLOW_R (11)
#define MAX8925_IRQ_VCHG_RST (12)
#define MAX8925_IRQ_VCHG_DONE (13)
#define MAX8925_IRQ_VCHG_TOPOFF (14)
#define MAX8925_IRQ_VCHG_TMR_FAULT (15)
#define MAX8925_IRQ_GPM_RSTIN (16)
#define MAX8925_IRQ_GPM_MPL (17)
#define MAX8925_IRQ_GPM_SW_3SEC (18)
#define MAX8925_IRQ_GPM_EXTON_F (19)
#define MAX8925_IRQ_GPM_EXTON_R (20)
#define MAX8925_IRQ_GPM_SW_1SEC (21)
#define MAX8925_IRQ_GPM_SW_F (22)
#define MAX8925_IRQ_GPM_SW_R (23)
#define MAX8925_IRQ_GPM_SYSCKEN_F (24)
#define MAX8925_IRQ_GPM_SYSCKEN_R (25)
#define MAX8925_IRQ_TSC_STICK (0)
#define MAX8925_IRQ_TSC_NSTICK (1)
struct max8925_irq {
irq_handler_t handler;
void *data;
};
struct max8925_chip {
struct device *dev;
struct mutex io_lock;
struct mutex irq_lock;
struct i2c_client *i2c;
struct max8925_irq irq[MAX8925_NUM_IRQ];
const char *name;
int chip_id;
int chip_irq;
};
struct max8925_platform_data {
int chip_id;
int chip_irq;
};
extern int max8925_reg_read(struct i2c_client *, int);
extern int max8925_reg_write(struct i2c_client *, int, unsigned char);
extern int max8925_bulk_read(struct i2c_client *, int, int, unsigned char *);
extern int max8925_bulk_write(struct i2c_client *, int, int, unsigned char *);
extern int max8925_set_bits(struct i2c_client *, int, unsigned char,
unsigned char);
extern int max8925_device_init(struct max8925_chip *,
struct max8925_platform_data *);
extern void max8925_device_exit(struct max8925_chip *);
#endif /* __LINUX_MFD_MAX8925_H */