Commit 608589b1 authored by wu guoxing's avatar wu guoxing Committed by Grant Likely
Browse files

ARM/mx35/3ds: gpio: add mc9s08dz60 gpio function 



we only use the gpio function of mc9s08dz60 mcu chip, so just
add the gpio driver, as this mcu will never be used in other board.

Signed-off-by: default avatarWu Guoxing <b39297@freescale.com>
Reviewed-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Acked-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent dcd6c922

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");