ARM/mx35/3ds: gpio: add mc9s08dz60 gpio function (608589b1) · Commits · 戴 / test

drivers/gpio/Kconfig

+6 −0

Original line number	Diff line number	Diff line
		@@ -225,6 +225,12 @@ config GPIO_MAX732X_IRQ
		Say yes here to enable the max732x to be used as an interrupt
		controller. It requires the driver to be built in the kernel.

		config GPIO_MC9S08DZ60
		bool "MX35 3DS BOARD MC9S08DZ60 GPIO functions"
		depends on I2C && MACH_MX35_3DS
		help
		Select this to enable the MC9S08DZ60 GPIO driver

		config GPIO_PCA953X
		tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
		depends on I2C

drivers/gpio/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@ obj-$(CONFIG_GPIO_MAX7300) += gpio-max7300.o
		obj-$(CONFIG_GPIO_MAX7301) += gpio-max7301.o
		obj-$(CONFIG_GPIO_MAX732X) += gpio-max732x.o
		obj-$(CONFIG_GPIO_MC33880) += gpio-mc33880.o
		obj-$(CONFIG_GPIO_MC9S08DZ60) += gpio-mc9s08dz60.o
		obj-$(CONFIG_GPIO_MCP23S08) += gpio-mcp23s08.o
		obj-$(CONFIG_GPIO_ML_IOH) += gpio-ml-ioh.o
		obj-$(CONFIG_GPIO_MPC5200) += gpio-mpc5200.o

drivers/gpio/gpio-mc9s08dz60.c

0 → 100644

+161 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright 2009-2012 Freescale Semiconductor, Inc. All Rights Reserved.
		*
		* Author: Wu Guoxing <b39297@freescale.com>
		*
		* 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.
		*/

		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/i2c.h>
		#include <linux/gpio.h>

		#define GPIO_GROUP_NUM 2
		#define GPIO_NUM_PER_GROUP 8
		#define GPIO_NUM (GPIO_GROUP_NUM*GPIO_NUM_PER_GROUP)

		struct mc9s08dz60 {
		struct i2c_client *client;
		struct gpio_chip chip;
		};

		static inline struct mc9s08dz60 to_mc9s08dz60(struct gpio_chip gc)
		{
		return container_of(gc, struct mc9s08dz60, chip);
		}


		static void mc9s_gpio_to_reg_and_bit(int offset, u8 reg, u8 bit)
		{
		*reg = 0x20 + offset / GPIO_NUM_PER_GROUP;
		*bit = offset % GPIO_NUM_PER_GROUP;
		}

		static int mc9s08dz60_get_value(struct gpio_chip *gc, unsigned offset)
		{
		u8 reg, bit;
		s32 value;
		struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);

		mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
		value = i2c_smbus_read_byte_data(mc9s->client, reg);

		return (value >= 0) ? (value >> bit) & 0x1 : 0;
		}

		static int mc9s08dz60_set(struct mc9s08dz60 *mc9s, unsigned offset, int val)
		{
		u8 reg, bit;
		s32 value;

		mc9s_gpio_to_reg_and_bit(offset, &reg, &bit);
		value = i2c_smbus_read_byte_data(mc9s->client, reg);
		if (value >= 0) {
		if (val)
		value \|= 1 << bit;
		else
		value &= ~(1 << bit);

		return i2c_smbus_write_byte_data(mc9s->client, reg, value);
		} else
		return value;

		}


		static void mc9s08dz60_set_value(struct gpio_chip *gc, unsigned offset, int val)
		{
		struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);

		mc9s08dz60_set(mc9s, offset, val);
		}

		static int mc9s08dz60_direction_output(struct gpio_chip *gc,
		unsigned offset, int val)
		{
		struct mc9s08dz60 *mc9s = to_mc9s08dz60(gc);

		return mc9s08dz60_set(mc9s, offset, val);
		}

		static int mc9s08dz60_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		int ret = 0;
		struct mc9s08dz60 *mc9s;

		mc9s = kzalloc(sizeof(*mc9s), GFP_KERNEL);
		if (!mc9s)
		return -ENOMEM;

		mc9s->chip.label = client->name;
		mc9s->chip.base = -1;
		mc9s->chip.dev = &client->dev;
		mc9s->chip.owner = THIS_MODULE;
		mc9s->chip.ngpio = GPIO_NUM;
		mc9s->chip.can_sleep = 1;
		mc9s->chip.get = mc9s08dz60_get_value;
		mc9s->chip.set = mc9s08dz60_set_value;
		mc9s->chip.direction_output = mc9s08dz60_direction_output;
		mc9s->client = client;
		i2c_set_clientdata(client, mc9s);

		ret = gpiochip_add(&mc9s->chip);
		if (ret)
		goto error;

		return 0;

		error:
		kfree(mc9s);
		return ret;
		}

		static int mc9s08dz60_remove(struct i2c_client *client)
		{
		struct mc9s08dz60 *mc9s;
		int ret;

		mc9s = i2c_get_clientdata(client);

		ret = gpiochip_remove(&mc9s->chip);
		if (!ret)
		kfree(mc9s);

		return ret;

		}

		static const struct i2c_device_id mc9s08dz60_id[] = {
		{"mc9s08dz60", 0},
		{},
		};

		MODULE_DEVICE_TABLE(i2c, mc9s08dz60_id);

		static struct i2c_driver mc9s08dz60_i2c_driver = {
		.driver = {
		.owner = THIS_MODULE,
		.name = "mc9s08dz60",
		},
		.probe = mc9s08dz60_probe,
		.remove = mc9s08dz60_remove,
		.id_table = mc9s08dz60_id,
		};

		module_i2c_driver(mc9s08dz60_i2c_driver);

		MODULE_AUTHOR("Freescale Semiconductor, Inc. "
		"Wu Guoxing <b39297@freescale.com>");
		MODULE_DESCRIPTION("mc9s08dz60 gpio function on mx35 3ds board");
		MODULE_LICENSE("GPL v2");

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