| /* |
| * I2C driver for Marvell 88PM860x |
| * |
| * 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/88pm860x.h> |
| #include <linux/slab.h> |
| |
| static inline int pm860x_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 pm860x_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 pm860x_reg_read(struct i2c_client *i2c, int reg) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| unsigned char data; |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| ret = pm860x_read_device(i2c, reg, 1, &data); |
| mutex_unlock(&chip->io_lock); |
| |
| if (ret < 0) |
| return ret; |
| else |
| return (int)data; |
| } |
| EXPORT_SYMBOL(pm860x_reg_read); |
| |
| int pm860x_reg_write(struct i2c_client *i2c, int reg, |
| unsigned char data) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| ret = pm860x_write_device(i2c, reg, 1, &data); |
| mutex_unlock(&chip->io_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_reg_write); |
| |
| int pm860x_bulk_read(struct i2c_client *i2c, int reg, |
| int count, unsigned char *buf) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| ret = pm860x_read_device(i2c, reg, count, buf); |
| mutex_unlock(&chip->io_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_bulk_read); |
| |
| int pm860x_bulk_write(struct i2c_client *i2c, int reg, |
| int count, unsigned char *buf) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| ret = pm860x_write_device(i2c, reg, count, buf); |
| mutex_unlock(&chip->io_lock); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_bulk_write); |
| |
| int pm860x_set_bits(struct i2c_client *i2c, int reg, |
| unsigned char mask, unsigned char data) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| unsigned char value; |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| ret = pm860x_read_device(i2c, reg, 1, &value); |
| if (ret < 0) |
| goto out; |
| value &= ~mask; |
| value |= data; |
| ret = pm860x_write_device(i2c, reg, 1, &value); |
| out: |
| mutex_unlock(&chip->io_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_set_bits); |
| |
| int pm860x_page_reg_read(struct i2c_client *i2c, int reg) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| unsigned char zero = 0; |
| unsigned char data; |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| pm860x_write_device(i2c, 0xFA, 0, &zero); |
| pm860x_write_device(i2c, 0xFB, 0, &zero); |
| pm860x_write_device(i2c, 0xFF, 0, &zero); |
| ret = pm860x_read_device(i2c, reg, 1, &data); |
| if (ret >= 0) |
| ret = (int)data; |
| pm860x_write_device(i2c, 0xFE, 0, &zero); |
| pm860x_write_device(i2c, 0xFC, 0, &zero); |
| mutex_unlock(&chip->io_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_page_reg_read); |
| |
| int pm860x_page_reg_write(struct i2c_client *i2c, int reg, |
| unsigned char data) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| unsigned char zero; |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| pm860x_write_device(i2c, 0xFA, 0, &zero); |
| pm860x_write_device(i2c, 0xFB, 0, &zero); |
| pm860x_write_device(i2c, 0xFF, 0, &zero); |
| ret = pm860x_write_device(i2c, reg, 1, &data); |
| pm860x_write_device(i2c, 0xFE, 0, &zero); |
| pm860x_write_device(i2c, 0xFC, 0, &zero); |
| mutex_unlock(&chip->io_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_page_reg_write); |
| |
| int pm860x_page_bulk_read(struct i2c_client *i2c, int reg, |
| int count, unsigned char *buf) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| unsigned char zero = 0; |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| pm860x_write_device(i2c, 0xFA, 0, &zero); |
| pm860x_write_device(i2c, 0xFB, 0, &zero); |
| pm860x_write_device(i2c, 0xFF, 0, &zero); |
| ret = pm860x_read_device(i2c, reg, count, buf); |
| pm860x_write_device(i2c, 0xFE, 0, &zero); |
| pm860x_write_device(i2c, 0xFC, 0, &zero); |
| mutex_unlock(&chip->io_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_page_bulk_read); |
| |
| int pm860x_page_bulk_write(struct i2c_client *i2c, int reg, |
| int count, unsigned char *buf) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| unsigned char zero = 0; |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| pm860x_write_device(i2c, 0xFA, 0, &zero); |
| pm860x_write_device(i2c, 0xFB, 0, &zero); |
| pm860x_write_device(i2c, 0xFF, 0, &zero); |
| ret = pm860x_write_device(i2c, reg, count, buf); |
| pm860x_write_device(i2c, 0xFE, 0, &zero); |
| pm860x_write_device(i2c, 0xFC, 0, &zero); |
| mutex_unlock(&chip->io_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_page_bulk_write); |
| |
| int pm860x_page_set_bits(struct i2c_client *i2c, int reg, |
| unsigned char mask, unsigned char data) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(i2c); |
| unsigned char zero; |
| unsigned char value; |
| int ret; |
| |
| mutex_lock(&chip->io_lock); |
| pm860x_write_device(i2c, 0xFA, 0, &zero); |
| pm860x_write_device(i2c, 0xFB, 0, &zero); |
| pm860x_write_device(i2c, 0xFF, 0, &zero); |
| ret = pm860x_read_device(i2c, reg, 1, &value); |
| if (ret < 0) |
| goto out; |
| value &= ~mask; |
| value |= data; |
| ret = pm860x_write_device(i2c, reg, 1, &value); |
| out: |
| pm860x_write_device(i2c, 0xFE, 0, &zero); |
| pm860x_write_device(i2c, 0xFC, 0, &zero); |
| mutex_unlock(&chip->io_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL(pm860x_page_set_bits); |
| |
| static const struct i2c_device_id pm860x_id_table[] = { |
| { "88PM860x", 0 }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(i2c, pm860x_id_table); |
| |
| static int verify_addr(struct i2c_client *i2c) |
| { |
| unsigned short addr_8607[] = {0x30, 0x34}; |
| unsigned short addr_8606[] = {0x10, 0x11}; |
| int size, i; |
| |
| if (i2c == NULL) |
| return 0; |
| size = ARRAY_SIZE(addr_8606); |
| for (i = 0; i < size; i++) { |
| if (i2c->addr == *(addr_8606 + i)) |
| return CHIP_PM8606; |
| } |
| size = ARRAY_SIZE(addr_8607); |
| for (i = 0; i < size; i++) { |
| if (i2c->addr == *(addr_8607 + i)) |
| return CHIP_PM8607; |
| } |
| return 0; |
| } |
| |
| static int __devinit pm860x_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct pm860x_platform_data *pdata = client->dev.platform_data; |
| struct pm860x_chip *chip; |
| |
| if (!pdata) { |
| pr_info("No platform data in %s!\n", __func__); |
| return -EINVAL; |
| } |
| |
| chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL); |
| if (chip == NULL) |
| return -ENOMEM; |
| |
| chip->id = verify_addr(client); |
| chip->client = client; |
| i2c_set_clientdata(client, chip); |
| chip->dev = &client->dev; |
| mutex_init(&chip->io_lock); |
| dev_set_drvdata(chip->dev, chip); |
| |
| /* |
| * Both client and companion client shares same platform driver. |
| * Driver distinguishes them by pdata->companion_addr. |
| * pdata->companion_addr is only assigned if companion chip exists. |
| * At the same time, the companion_addr shouldn't equal to client |
| * address. |
| */ |
| if (pdata->companion_addr && (pdata->companion_addr != client->addr)) { |
| chip->companion_addr = pdata->companion_addr; |
| chip->companion = i2c_new_dummy(chip->client->adapter, |
| chip->companion_addr); |
| i2c_set_clientdata(chip->companion, chip); |
| } |
| |
| pm860x_device_init(chip, pdata); |
| return 0; |
| } |
| |
| static int __devexit pm860x_remove(struct i2c_client *client) |
| { |
| struct pm860x_chip *chip = i2c_get_clientdata(client); |
| |
| pm860x_device_exit(chip); |
| i2c_unregister_device(chip->companion); |
| kfree(chip); |
| return 0; |
| } |
| |
| static struct i2c_driver pm860x_driver = { |
| .driver = { |
| .name = "88PM860x", |
| .owner = THIS_MODULE, |
| }, |
| .probe = pm860x_probe, |
| .remove = __devexit_p(pm860x_remove), |
| .id_table = pm860x_id_table, |
| }; |
| |
| static int __init pm860x_i2c_init(void) |
| { |
| int ret; |
| ret = i2c_add_driver(&pm860x_driver); |
| if (ret != 0) |
| pr_err("Failed to register 88PM860x I2C driver: %d\n", ret); |
| return ret; |
| } |
| subsys_initcall(pm860x_i2c_init); |
| |
| static void __exit pm860x_i2c_exit(void) |
| { |
| i2c_del_driver(&pm860x_driver); |
| } |
| module_exit(pm860x_i2c_exit); |
| |
| MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x"); |
| MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); |
| MODULE_LICENSE("GPL"); |
