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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/gpio/tps65910-gpio.c
15109 views
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/*

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 * tps65910-gpio.c  --  TI TPS6591x

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 *

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 * Copyright 2010 Texas Instruments Inc.

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 *

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 * Author: Graeme Gregory <[email protected]>

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 * Author: Jorge Eduardo Candelaria [email protected]>

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 *

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 *  This program is free software; you can redistribute it and/or modify it

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 *  under  the terms of the GNU General  Public License as published by the

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 *  Free Software Foundation;  either version 2 of the License, or (at your

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 *  option) any later version.

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 *

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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/errno.h>

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#include <linux/gpio.h>

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#include <linux/i2c.h>

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#include <linux/mfd/tps65910.h>

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static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)

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{

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	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);

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	uint8_t val;

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	tps65910->read(tps65910, TPS65910_GPIO0 + offset, 1, &val);

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	if (val & GPIO_STS_MASK)

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		return 1;

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	return 0;

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}

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static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,

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			      int value)

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{

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	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);

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	if (value)

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		tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,

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						GPIO_SET_MASK);

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	else

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		tps65910_clear_bits(tps65910, TPS65910_GPIO0 + offset,

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						GPIO_SET_MASK);

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}

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static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,

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				int value)

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{

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	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);

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	/* Set the initial value */

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	tps65910_gpio_set(gc, 0, value);

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	return tps65910_set_bits(tps65910, TPS65910_GPIO0 + offset,

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						GPIO_CFG_MASK);

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}

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static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)

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{

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	struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);

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	return tps65910_clear_bits(tps65910, TPS65910_GPIO0 + offset,

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						GPIO_CFG_MASK);

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}

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void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)

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{

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	int ret;

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	if (!gpio_base)

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		return;

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	tps65910->gpio.owner		= THIS_MODULE;

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	tps65910->gpio.label		= tps65910->i2c_client->name;

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	tps65910->gpio.dev		= tps65910->dev;

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	tps65910->gpio.base		= gpio_base;

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	switch(tps65910_chip_id(tps65910)) {

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	case TPS65910:

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		tps65910->gpio.ngpio	= 6;

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		break;

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	case TPS65911:

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		tps65910->gpio.ngpio	= 9;

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		break;

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	default:

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		return;

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	}

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	tps65910->gpio.can_sleep	= 1;

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	tps65910->gpio.direction_input	= tps65910_gpio_input;

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	tps65910->gpio.direction_output	= tps65910_gpio_output;

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	tps65910->gpio.set		= tps65910_gpio_set;

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	tps65910->gpio.get		= tps65910_gpio_get;

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	ret = gpiochip_add(&tps65910->gpio);

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	if (ret)

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		dev_warn(tps65910->dev, "GPIO registration failed: %d\n", ret);

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}

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