diff options
Diffstat (limited to 'drivers/mfd/88pm860x-i2c.c')
| -rw-r--r-- | drivers/mfd/88pm860x-i2c.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/mfd/88pm860x-i2c.c b/drivers/mfd/88pm860x-i2c.c new file mode 100644 index 000000000..7b9052ea7 --- /dev/null +++ b/drivers/mfd/88pm860x-i2c.c @@ -0,0 +1,177 @@ +/* + * I2C driver for Marvell 88PM860x + * + * Copyright (C) 2009 Marvell International Ltd. + * + * Author: 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/regmap.h> +#include <linux/mfd/88pm860x.h> + +int pm860x_reg_read(struct i2c_client *i2c, int reg) +{ + struct pm860x_chip *chip = i2c_get_clientdata(i2c); + struct regmap *map = (i2c == chip->client) ? chip->regmap + : chip->regmap_companion; + unsigned int data; + int ret; + + ret = regmap_read(map, reg, &data); + 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); + struct regmap *map = (i2c == chip->client) ? chip->regmap + : chip->regmap_companion; + int ret; + + ret = regmap_write(map, reg, data); + 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); + struct regmap *map = (i2c == chip->client) ? chip->regmap + : chip->regmap_companion; + int ret; + + ret = regmap_raw_read(map, reg, buf, count); + 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); + struct regmap *map = (i2c == chip->client) ? chip->regmap + : chip->regmap_companion; + int ret; + + ret = regmap_raw_write(map, reg, buf, count); + 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); + struct regmap *map = (i2c == chip->client) ? chip->regmap + : chip->regmap_companion; + int ret; + + ret = regmap_update_bits(map, reg, mask, data); + return ret; +} +EXPORT_SYMBOL(pm860x_set_bits); + +static int read_device(struct i2c_client *i2c, int reg, + int bytes, void *dest) +{ + unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3]; + unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2]; + struct i2c_adapter *adap = i2c->adapter; + struct i2c_msg msg[2] = { + { + .addr = i2c->addr, + .flags = 0, + .len = 1, + .buf = msgbuf0 + }, + { .addr = i2c->addr, + .flags = I2C_M_RD, + .len = 0, + .buf = msgbuf1 + }, + }; + int num = 1, ret = 0; + + if (dest == NULL) + return -EINVAL; + msgbuf0[0] = (unsigned char)reg; /* command */ + msg[1].len = bytes; + + /* if data needs to read back, num should be 2 */ + if (bytes > 0) + num = 2; + ret = adap->algo->master_xfer(adap, msg, num); + memcpy(dest, msgbuf1, bytes); + if (ret < 0) + return ret; + return 0; +} + +static int write_device(struct i2c_client *i2c, int reg, + int bytes, void *src) +{ + unsigned char buf[2]; + struct i2c_adapter *adap = i2c->adapter; + struct i2c_msg msg; + int ret; + + buf[0] = (unsigned char)reg; + memcpy(&buf[1], src, bytes); + msg.addr = i2c->addr; + msg.flags = 0; + msg.len = bytes + 1; + msg.buf = buf; + + ret = adap->algo->master_xfer(adap, &msg, 1); + if (ret < 0) + return ret; + return 0; +} + +int pm860x_page_reg_write(struct i2c_client *i2c, int reg, + unsigned char data) +{ + unsigned char zero; + int ret; + + i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT); + read_device(i2c, 0xFA, 0, &zero); + read_device(i2c, 0xFB, 0, &zero); + read_device(i2c, 0xFF, 0, &zero); + ret = write_device(i2c, reg, 1, &data); + read_device(i2c, 0xFE, 0, &zero); + read_device(i2c, 0xFC, 0, &zero); + i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT); + return ret; +} +EXPORT_SYMBOL(pm860x_page_reg_write); + +int pm860x_page_bulk_read(struct i2c_client *i2c, int reg, + int count, unsigned char *buf) +{ + unsigned char zero = 0; + int ret; + + i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT); + read_device(i2c, 0xfa, 0, &zero); + read_device(i2c, 0xfb, 0, &zero); + read_device(i2c, 0xff, 0, &zero); + ret = read_device(i2c, reg, count, buf); + read_device(i2c, 0xFE, 0, &zero); + read_device(i2c, 0xFC, 0, &zero); + i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT); + return ret; +} +EXPORT_SYMBOL(pm860x_page_bulk_read); |