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c942fddf87
Based on 3 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 as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
113 lines
2.6 KiB
C
113 lines
2.6 KiB
C
// 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 <b39297@freescale.com>
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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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