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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
174 lines
4.1 KiB
C
174 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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*
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* Author: Haojian Zhuang <haojian.zhuang@marvell.com>
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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/i2c.h>
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#include <linux/regmap.h>
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#include <linux/mfd/88pm860x.h>
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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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struct regmap *map = (i2c == chip->client) ? chip->regmap
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: chip->regmap_companion;
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unsigned int data;
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int ret;
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ret = regmap_read(map, reg, &data);
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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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struct regmap *map = (i2c == chip->client) ? chip->regmap
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: chip->regmap_companion;
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int ret;
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ret = regmap_write(map, reg, data);
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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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struct regmap *map = (i2c == chip->client) ? chip->regmap
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: chip->regmap_companion;
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int ret;
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ret = regmap_raw_read(map, reg, buf, count);
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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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struct regmap *map = (i2c == chip->client) ? chip->regmap
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: chip->regmap_companion;
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int ret;
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ret = regmap_raw_write(map, reg, buf, count);
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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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struct regmap *map = (i2c == chip->client) ? chip->regmap
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: chip->regmap_companion;
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int ret;
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ret = regmap_update_bits(map, reg, mask, data);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_set_bits);
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static int read_device(struct i2c_client *i2c, int reg,
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int bytes, void *dest)
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{
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unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3];
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unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2];
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struct i2c_adapter *adap = i2c->adapter;
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struct i2c_msg msg[2] = {
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{
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.addr = i2c->addr,
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.flags = 0,
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.len = 1,
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.buf = msgbuf0
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},
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{ .addr = i2c->addr,
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.flags = I2C_M_RD,
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.len = 0,
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.buf = msgbuf1
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},
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};
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int num = 1, ret = 0;
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if (dest == NULL)
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return -EINVAL;
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msgbuf0[0] = (unsigned char)reg; /* command */
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msg[1].len = bytes;
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/* if data needs to read back, num should be 2 */
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if (bytes > 0)
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num = 2;
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ret = adap->algo->master_xfer(adap, msg, num);
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memcpy(dest, msgbuf1, 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 int write_device(struct i2c_client *i2c, int reg,
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int bytes, void *src)
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{
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unsigned char buf[2];
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struct i2c_adapter *adap = i2c->adapter;
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struct i2c_msg msg;
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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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msg.addr = i2c->addr;
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msg.flags = 0;
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msg.len = bytes + 1;
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msg.buf = buf;
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ret = adap->algo->master_xfer(adap, &msg, 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_page_reg_write(struct i2c_client *i2c, int reg,
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unsigned char data)
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{
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unsigned char zero;
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int ret;
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i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
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read_device(i2c, 0xFA, 0, &zero);
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read_device(i2c, 0xFB, 0, &zero);
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read_device(i2c, 0xFF, 0, &zero);
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ret = write_device(i2c, reg, 1, &data);
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read_device(i2c, 0xFE, 0, &zero);
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read_device(i2c, 0xFC, 0, &zero);
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i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
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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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unsigned char zero = 0;
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int ret;
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i2c_lock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
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read_device(i2c, 0xfa, 0, &zero);
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read_device(i2c, 0xfb, 0, &zero);
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read_device(i2c, 0xff, 0, &zero);
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ret = read_device(i2c, reg, count, buf);
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read_device(i2c, 0xFE, 0, &zero);
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read_device(i2c, 0xFC, 0, &zero);
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i2c_unlock_bus(i2c->adapter, I2C_LOCK_SEGMENT);
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return ret;
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}
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EXPORT_SYMBOL(pm860x_page_bulk_read);
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