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112 lines
2.6 KiB
112 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved. |
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* |
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* Author: Wu Guoxing <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/i2c.h> |
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#include <linux/gpio/driver.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 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 = gpiochip_get_data(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 = gpiochip_get_data(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 = gpiochip_get_data(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.parent = &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 = true; |
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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 devm_gpiochip_add_data(&client->dev, &mc9s->chip, mc9s); |
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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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static struct i2c_driver mc9s08dz60_i2c_driver = { |
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.driver = { |
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.name = "mc9s08dz60", |
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}, |
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.probe = mc9s08dz60_probe, |
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.id_table = mc9s08dz60_id, |
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}; |
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builtin_i2c_driver(mc9s08dz60_i2c_driver);
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