9467d298e9
The device tps65910/tps65911 supports the sleep functionality in some of gpios. If gpio is configured in output mode and sleep is enabled then during device sleep state, the output of gpio becomes LOW regardless of non-sleep output value. Such gpio can be used to control regulator switch such that output of regulator is off in device sleep state. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: Linus Walleij <linus.walleij@linaro.org>
119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/*
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* TI TPS6591x GPIO driver
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*
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* Copyright 2010 Texas Instruments Inc.
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*
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* Author: Graeme Gregory <gg@slimlogic.co.uk>
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* Author: Jorge Eduardo Candelaria jedu@slimlogic.co.uk>
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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, offset, 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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struct tps65910_board *board_data;
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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 = TPS65910_NUM_GPIO;
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break;
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case TPS65911:
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tps65910->gpio.ngpio = TPS65911_NUM_GPIO;
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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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/* Configure sleep control for gpios */
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board_data = dev_get_platdata(tps65910->dev);
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if (board_data) {
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int i;
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for (i = 0; i < tps65910->gpio.ngpio; ++i) {
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if (board_data->en_gpio_sleep[i]) {
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ret = tps65910_set_bits(tps65910,
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TPS65910_GPIO0 + i, GPIO_SLEEP_MASK);
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if (ret < 0)
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dev_warn(tps65910->dev,
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"GPIO Sleep setting failed\n");
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}
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}
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}
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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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