339 lines
8.2 KiB
C
339 lines
8.2 KiB
C
/*
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* I2C driver for Marvell 88PM860x
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*
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* Copyright (C) 2009 Marvell International Ltd.
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* Haojian Zhuang <haojian.zhuang@marvell.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/mfd/88pm860x.h>
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#include <linux/slab.h>
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static inline int pm860x_read_device(struct i2c_client *i2c,
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int reg, int bytes, void *dest)
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{
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unsigned char data;
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int ret;
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data = (unsigned char)reg;
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ret = i2c_master_send(i2c, &data, 1);
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if (ret < 0)
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return ret;
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ret = i2c_master_recv(i2c, dest, bytes);
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if (ret < 0)
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return ret;
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return 0;
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}
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static inline int pm860x_write_device(struct i2c_client *i2c,
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int reg, int bytes, void *src)
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{
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unsigned char buf[bytes + 1];
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int ret;
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buf[0] = (unsigned char)reg;
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memcpy(&buf[1], src, bytes);
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ret = i2c_master_send(i2c, buf, bytes + 1);
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if (ret < 0)
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return ret;
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return 0;
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}
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int pm860x_reg_read(struct i2c_client *i2c, int reg)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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unsigned char data;
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int ret;
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mutex_lock(&chip->io_lock);
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ret = pm860x_read_device(i2c, reg, 1, &data);
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mutex_unlock(&chip->io_lock);
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if (ret < 0)
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return ret;
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else
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return (int)data;
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}
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EXPORT_SYMBOL(pm860x_reg_read);
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int pm860x_reg_write(struct i2c_client *i2c, int reg,
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unsigned char data)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&chip->io_lock);
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ret = pm860x_write_device(i2c, reg, 1, &data);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_reg_write);
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int pm860x_bulk_read(struct i2c_client *i2c, int reg,
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int count, unsigned char *buf)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&chip->io_lock);
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ret = pm860x_read_device(i2c, reg, count, buf);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_bulk_read);
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int pm860x_bulk_write(struct i2c_client *i2c, int reg,
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int count, unsigned char *buf)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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int ret;
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mutex_lock(&chip->io_lock);
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ret = pm860x_write_device(i2c, reg, count, buf);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_bulk_write);
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int pm860x_set_bits(struct i2c_client *i2c, int reg,
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unsigned char mask, unsigned char data)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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unsigned char value;
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int ret;
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mutex_lock(&chip->io_lock);
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ret = pm860x_read_device(i2c, reg, 1, &value);
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if (ret < 0)
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goto out;
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value &= ~mask;
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value |= data;
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ret = pm860x_write_device(i2c, reg, 1, &value);
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out:
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_set_bits);
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int pm860x_page_reg_read(struct i2c_client *i2c, int reg)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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unsigned char zero = 0;
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unsigned char data;
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int ret;
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mutex_lock(&chip->io_lock);
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pm860x_write_device(i2c, 0xFA, 0, &zero);
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pm860x_write_device(i2c, 0xFB, 0, &zero);
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pm860x_write_device(i2c, 0xFF, 0, &zero);
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ret = pm860x_read_device(i2c, reg, 1, &data);
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if (ret >= 0)
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ret = (int)data;
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pm860x_write_device(i2c, 0xFE, 0, &zero);
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pm860x_write_device(i2c, 0xFC, 0, &zero);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_page_reg_read);
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int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
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unsigned char data)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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unsigned char zero;
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int ret;
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mutex_lock(&chip->io_lock);
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pm860x_write_device(i2c, 0xFA, 0, &zero);
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pm860x_write_device(i2c, 0xFB, 0, &zero);
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pm860x_write_device(i2c, 0xFF, 0, &zero);
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ret = pm860x_write_device(i2c, reg, 1, &data);
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pm860x_write_device(i2c, 0xFE, 0, &zero);
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pm860x_write_device(i2c, 0xFC, 0, &zero);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_page_reg_write);
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int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
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int count, unsigned char *buf)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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unsigned char zero = 0;
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int ret;
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mutex_lock(&chip->io_lock);
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pm860x_write_device(i2c, 0xFA, 0, &zero);
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pm860x_write_device(i2c, 0xFB, 0, &zero);
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pm860x_write_device(i2c, 0xFF, 0, &zero);
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ret = pm860x_read_device(i2c, reg, count, buf);
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pm860x_write_device(i2c, 0xFE, 0, &zero);
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pm860x_write_device(i2c, 0xFC, 0, &zero);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_page_bulk_read);
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int pm860x_page_bulk_write(struct i2c_client *i2c, int reg,
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int count, unsigned char *buf)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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unsigned char zero = 0;
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int ret;
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mutex_lock(&chip->io_lock);
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pm860x_write_device(i2c, 0xFA, 0, &zero);
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pm860x_write_device(i2c, 0xFB, 0, &zero);
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pm860x_write_device(i2c, 0xFF, 0, &zero);
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ret = pm860x_write_device(i2c, reg, count, buf);
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pm860x_write_device(i2c, 0xFE, 0, &zero);
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pm860x_write_device(i2c, 0xFC, 0, &zero);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_page_bulk_write);
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int pm860x_page_set_bits(struct i2c_client *i2c, int reg,
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unsigned char mask, unsigned char data)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(i2c);
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unsigned char zero;
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unsigned char value;
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int ret;
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mutex_lock(&chip->io_lock);
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pm860x_write_device(i2c, 0xFA, 0, &zero);
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pm860x_write_device(i2c, 0xFB, 0, &zero);
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pm860x_write_device(i2c, 0xFF, 0, &zero);
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ret = pm860x_read_device(i2c, reg, 1, &value);
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if (ret < 0)
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goto out;
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value &= ~mask;
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value |= data;
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ret = pm860x_write_device(i2c, reg, 1, &value);
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out:
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pm860x_write_device(i2c, 0xFE, 0, &zero);
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pm860x_write_device(i2c, 0xFC, 0, &zero);
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mutex_unlock(&chip->io_lock);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_page_set_bits);
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static const struct i2c_device_id pm860x_id_table[] = {
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{ "88PM860x", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
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static int verify_addr(struct i2c_client *i2c)
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{
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unsigned short addr_8607[] = {0x30, 0x34};
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unsigned short addr_8606[] = {0x10, 0x11};
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int size, i;
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if (i2c == NULL)
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return 0;
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size = ARRAY_SIZE(addr_8606);
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for (i = 0; i < size; i++) {
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if (i2c->addr == *(addr_8606 + i))
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return CHIP_PM8606;
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}
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size = ARRAY_SIZE(addr_8607);
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for (i = 0; i < size; i++) {
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if (i2c->addr == *(addr_8607 + i))
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return CHIP_PM8607;
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}
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return 0;
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}
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static int __devinit pm860x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pm860x_platform_data *pdata = client->dev.platform_data;
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struct pm860x_chip *chip;
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if (!pdata) {
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pr_info("No platform data in %s!\n", __func__);
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return -EINVAL;
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}
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chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL);
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if (chip == NULL)
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return -ENOMEM;
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chip->id = verify_addr(client);
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chip->client = client;
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i2c_set_clientdata(client, chip);
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chip->dev = &client->dev;
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mutex_init(&chip->io_lock);
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dev_set_drvdata(chip->dev, chip);
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/*
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* Both client and companion client shares same platform driver.
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* Driver distinguishes them by pdata->companion_addr.
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* pdata->companion_addr is only assigned if companion chip exists.
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* At the same time, the companion_addr shouldn't equal to client
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* address.
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*/
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if (pdata->companion_addr && (pdata->companion_addr != client->addr)) {
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chip->companion_addr = pdata->companion_addr;
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chip->companion = i2c_new_dummy(chip->client->adapter,
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chip->companion_addr);
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i2c_set_clientdata(chip->companion, chip);
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}
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pm860x_device_init(chip, pdata);
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return 0;
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}
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static int __devexit pm860x_remove(struct i2c_client *client)
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{
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struct pm860x_chip *chip = i2c_get_clientdata(client);
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pm860x_device_exit(chip);
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i2c_unregister_device(chip->companion);
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kfree(chip);
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return 0;
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}
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static struct i2c_driver pm860x_driver = {
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.driver = {
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.name = "88PM860x",
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.owner = THIS_MODULE,
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},
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.probe = pm860x_probe,
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.remove = __devexit_p(pm860x_remove),
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.id_table = pm860x_id_table,
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};
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static int __init pm860x_i2c_init(void)
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{
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int ret;
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ret = i2c_add_driver(&pm860x_driver);
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if (ret != 0)
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pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
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return ret;
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}
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subsys_initcall(pm860x_i2c_init);
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static void __exit pm860x_i2c_exit(void)
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{
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i2c_del_driver(&pm860x_driver);
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}
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module_exit(pm860x_i2c_exit);
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MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
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MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
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MODULE_LICENSE("GPL");
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