147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/*
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* Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* Author: Wu Guoxing <b39297@freescale.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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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/slab.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#define GPIO_GROUP_NUM 2
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#define GPIO_NUM_PER_GROUP 8
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#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)
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struct mc9s08dz60 {
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struct i2c_client *client;
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struct gpio_chip chip;
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};
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static inline struct mc9s08dz60 *to_mc9s08dz60(struct gpio_chip *gc)
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{
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return container_of(gc, struct mc9s08dz60, chip);
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}
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static void mc9s_gpio_to_reg_and_bit(int offset, u8 *reg, u8 *bit)
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{
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*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
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*bit = offset % GPIO_NUM_PER_GROUP;
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}
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static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
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{
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u8 reg, bit;
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s32 value;
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struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
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mc9s_gpio_to_reg_and_bit(offset, ®, &bit);
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value = i2c_smbus_read_byte_data(mc9s->client, reg);
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return (value >= 0) ? (value >> bit) & 0x1 : 0;
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}
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static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
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{
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u8 reg, bit;
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s32 value;
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mc9s_gpio_to_reg_and_bit(offset, ®, &bit);
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value = i2c_smbus_read_byte_data(mc9s->client, reg);
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if (value >= 0) {
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if (val)
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value |= 1 << bit;
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else
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value &= ~(1 << bit);
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return i2c_smbus_write_byte_data(mc9s->client, reg, value);
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} else
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return value;
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}
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static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
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{
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struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
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mc9s08dz60_set(mc9s, offset, val);
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}
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static int mc9s08dz60_direction_output(struct gpio_chip *gc,
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unsigned offset, int val)
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{
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struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);
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return mc9s08dz60_set(mc9s, offset, val);
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}
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static int mc9s08dz60_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct mc9s08dz60 *mc9s;
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mc9s = devm_kzalloc(&client->dev, sizeof(*mc9s), GFP_KERNEL);
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if (!mc9s)
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return -ENOMEM;
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mc9s->chip.label = client->name;
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mc9s->chip.base = -1;
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mc9s->chip.dev = &client->dev;
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mc9s->chip.owner = THIS_MODULE;
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mc9s->chip.ngpio = GPIO_NUM;
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mc9s->chip.can_sleep = 1;
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mc9s->chip.get = mc9s08dz60_get_value;
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mc9s->chip.set = mc9s08dz60_set_value;
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mc9s->chip.direction_output = mc9s08dz60_direction_output;
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mc9s->client = client;
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i2c_set_clientdata(client, mc9s);
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return gpiochip_add(&mc9s->chip);
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}
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static int mc9s08dz60_remove(struct i2c_client *client)
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{
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struct mc9s08dz60 *mc9s;
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mc9s = i2c_get_clientdata(client);
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return gpiochip_remove(&mc9s->chip);
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}
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static const struct i2c_device_id mc9s08dz60_id[] = {
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{"mc9s08dz60", 0},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, mc9s08dz60_id);
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static struct i2c_driver mc9s08dz60_i2c_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "mc9s08dz60",
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},
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.probe = mc9s08dz60_probe,
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.remove = mc9s08dz60_remove,
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.id_table = mc9s08dz60_id,
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};
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module_i2c_driver(mc9s08dz60_i2c_driver);
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MODULE_AUTHOR("Freescale Semiconductor, Inc. "
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"Wu Guoxing <b39297@freescale.com>");
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MODULE_DESCRIPTION("mc9s08dz60 gpio function on mx35 3ds board");
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MODULE_LICENSE("GPL v2");
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