From 772445013e309f7d0b01d3436bfcabcc3a905551 Mon Sep 17 00:00:00 2001 From: Haojian Zhuang Date: Thu, 17 Dec 2009 12:30:16 -0500 Subject: [PATCH] mfd: enable max8925 Max8925 is a Power Management IC from Maxim Semiconductor. Do basic support on accessing MAX8925. Signed-off-by: Haojian Zhuang --- drivers/mfd/Kconfig | 9 ++ drivers/mfd/Makefile | 2 + drivers/mfd/max8925-core.c | 256 +++++++++++++++++++++++++++++++++++++++++++ drivers/mfd/max8925-i2c.c | 202 ++++++++++++++++++++++++++++++++++ include/linux/mfd/max8925.h | 112 +++++++++++++++++++ 5 files changed, 581 insertions(+), 0 deletions(-) create mode 100644 drivers/mfd/max8925-core.c create mode 100644 drivers/mfd/max8925-i2c.c create mode 100644 include/linux/mfd/max8925.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 570be13..259cabf 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -160,6 +160,15 @@ config PMIC_DA903X individual components like LCD backlight, voltage regulators, LEDs and battery-charger 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 diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index f3b277b..2809869 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -44,6 +44,8 @@ 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 diff --git a/drivers/mfd/max8925-core.c b/drivers/mfd/max8925-core.c new file mode 100644 index 0000000..e7e1895 --- /dev/null +++ b/drivers/mfd/max8925-core.c @@ -0,0 +1,256 @@ +/* + * Base driver for Maxim MAX8925 + * + * Copyright (C) 2009 Marvell International Ltd. + * Haojian Zhuang + * + * 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 +#include +#include +#include +#include +#include +#include + +#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 % 8; + if (irq < 16) { + *offset = (mode) ? MAX8925_CHG_IRQ1_MASK + : MAX8925_CHG_IRQ1; + if (irq >= 8) + (*offset)++; + } else { + *offset = (mode) ? MAX8925_ON_OFF_IRQ1_MASK + : MAX8925_ON_OFF_IRQ1; + if (irq >= 24) + (*offset)++; + } + break; + case MAX8925_ADC: + *bit = irq % 8; + *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 (4) + +static irqreturn_t max8925_irq_thread(int irq, void *data) +{ + DECLARE_BITMAP(irq_status, MAX8925_NUM_IRQ); + struct max8925_chip *chip = data; + unsigned char status_buf[INT_STATUS_NUM << 1]; + int i, ret; + + irq_status[0] = 0; + + /* 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, + 4, &status_buf[4]); + 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] << 8); + status_buf[4] &= (~status_buf[6] & ON_OFF_IRQ1_MASK); + irq_status[0] |= (status_buf[4] << 16); + status_buf[5] &= (~status_buf[7] & ON_OFF_IRQ2_MASK); + irq_status[0] |= (status_buf[5] << 24); + 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; + } + + while (!bitmap_empty(irq_status, MAX8925_NUM_IRQ)) { + i = find_first_bit(irq_status, 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; + + memcpy(chip->name, "GPM", 3); + 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; +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); + + memcpy(chip->name, "ADC", 3); + 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 + * + * 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 +#include +#include +#include +#include + +static inline int max8925_read_device(struct i2c_client *i2c, + int reg, int bytes, void *dest) +{ + unsigned char data; + int ret; + + data = (unsigned char)reg; + ret = i2c_master_send(i2c, &data, 1); + if (ret < 0) + return ret; + + ret = i2c_master_recv(i2c, dest, bytes); + if (ret < 0) + return ret; + 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); + + return 0; +} + +static int __devexit max8925_remove(struct i2c_client *client) +{ + struct max8925_chip *chip = i2c_get_clientdata(client); + + 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 "); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/max8925.h b/include/linux/mfd/max8925.h new file mode 100644 index 0000000..8cc0608 --- /dev/null +++ b/include/linux/mfd/max8925.h @@ -0,0 +1,112 @@ +/* + * Maxim8925 Interface + * + * Copyright (C) 2009 Marvell International Ltd. + * Haojian Zhuang + * + * 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 + +/* 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_ON_OFF_IRQ1 (0x00) +#define MAX8925_ON_OFF_IRQ2 (0x01) +#define MAX8925_ON_OFF_IRQ1_MASK (0x02) +#define MAX8925_ON_OFF_IRQ2_MASK (0x03) + +/* 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]; + + char name[MAX8925_NAME_SIZE]; + 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); +#endif /* __LINUX_MFD_MAX8925_H */ + -- 1.5.6.5