drivers/gpio/gpio-palmas.c - kernel/msm-4.19 - Gitiles

 /*
  * TI Palma series PMIC's GPIO driver.
  *
  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
  *
  * Author: Laxman Dewangan <ldewangan@nvidia.com>
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <linux/gpio.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mfd/palmas.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>

 struct palmas_gpio {
 	struct gpio_chip gpio_chip;
 	struct palmas *palmas;
 };

 struct palmas_device_data {
 	int ngpio;
 };

 static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
 {
 	struct palmas_gpio *pg = gpiochip_get_data(gc);
 	struct palmas *palmas = pg->palmas;
 	unsigned int val;
 	int ret;
 	unsigned int reg;
 	int gpio16 = (offset/8);

 	offset %= 8;
 	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

 	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
 	if (ret < 0) {
 		dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
 		return ret;
 	}

 	if (val & BIT(offset))
 		reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
 	else
 		reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;

 	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
 	if (ret < 0) {
 		dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
 		return ret;
 	}
 	return !!(val & BIT(offset));
 }

 static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
 			int value)
 {
 	struct palmas_gpio *pg = gpiochip_get_data(gc);
 	struct palmas *palmas = pg->palmas;
 	int ret;
 	unsigned int reg;
 	int gpio16 = (offset/8);

 	offset %= 8;
 	if (gpio16)
 		reg = (value) ?
 			PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
 	else
 		reg = (value) ?
 			PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;

 	ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
 	if (ret < 0)
 		dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
 }

 static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
 				int value)
 {
 	struct palmas_gpio *pg = gpiochip_get_data(gc);
 	struct palmas *palmas = pg->palmas;
 	int ret;
 	unsigned int reg;
 	int gpio16 = (offset/8);

 	offset %= 8;
 	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

 	/* Set the initial value */
 	palmas_gpio_set(gc, offset, value);

 	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
 				BIT(offset), BIT(offset));
 	if (ret < 0)
 		dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
 			ret);
 	return ret;
 }

 static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
 {
 	struct palmas_gpio *pg = gpiochip_get_data(gc);
 	struct palmas *palmas = pg->palmas;
 	int ret;
 	unsigned int reg;
 	int gpio16 = (offset/8);

 	offset %= 8;
 	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

 	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
 	if (ret < 0)
 		dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
 			ret);
 	return ret;
 }

 static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 {
 	struct palmas_gpio *pg = gpiochip_get_data(gc);
 	struct palmas *palmas = pg->palmas;

 	return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
 }

 static const struct palmas_device_data palmas_dev_data = {
 	.ngpio = 8,
 };

 static const struct palmas_device_data tps80036_dev_data = {
 	.ngpio = 16,
 };

 static const struct of_device_id of_palmas_gpio_match[] = {
 	{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
 	{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
 	{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
 	{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);

 static int palmas_gpio_probe(struct platform_device *pdev)
 {
 	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
 	struct palmas_platform_data *palmas_pdata;
 	struct palmas_gpio *palmas_gpio;
 	int ret;
 	const struct of_device_id *match;
 	const struct palmas_device_data *dev_data;

 	match = of_match_device(of_palmas_gpio_match, &pdev->dev);
 	if (!match)
 		return -ENODEV;
 	dev_data = match->data;
 	if (!dev_data)
 		dev_data = &palmas_dev_data;

 	palmas_gpio = devm_kzalloc(&pdev->dev,
 				sizeof(*palmas_gpio), GFP_KERNEL);
 	if (!palmas_gpio)
 		return -ENOMEM;

 	palmas_gpio->palmas = palmas;
 	palmas_gpio->gpio_chip.owner = THIS_MODULE;
 	palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
 	palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
 	palmas_gpio->gpio_chip.can_sleep = true;
 	palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
 	palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
 	palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
 	palmas_gpio->gpio_chip.set	= palmas_gpio_set;
 	palmas_gpio->gpio_chip.get	= palmas_gpio_get;
 	palmas_gpio->gpio_chip.parent = &pdev->dev;
 #ifdef CONFIG_OF_GPIO
 	palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
 #endif
 	palmas_pdata = dev_get_platdata(palmas->dev);
 	if (palmas_pdata && palmas_pdata->gpio_base)
 		palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
 	else
 		palmas_gpio->gpio_chip.base = -1;

 	ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
 				     palmas_gpio);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 		return ret;
 	}

 	platform_set_drvdata(pdev, palmas_gpio);
 	return ret;
 }

 static struct platform_driver palmas_gpio_driver = {
 	.driver.name	= "palmas-gpio",
 	.driver.owner	= THIS_MODULE,
 	.driver.of_match_table = of_palmas_gpio_match,
 	.probe		= palmas_gpio_probe,
 };

 static int __init palmas_gpio_init(void)
 {
 	return platform_driver_register(&palmas_gpio_driver);
 }
 subsys_initcall(palmas_gpio_init);

 static void __exit palmas_gpio_exit(void)
 {
 	platform_driver_unregister(&palmas_gpio_driver);
 }
 module_exit(palmas_gpio_exit);

 MODULE_ALIAS("platform:palmas-gpio");
 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
 MODULE_LICENSE("GPL v2");
	/*
	* TI Palma series PMIC's GPIO driver.
	*
	* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
	*
	* Author: Laxman Dewangan <ldewangan@nvidia.com>
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <linux/gpio.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mfd/palmas.h>
	#include <linux/of.h>
	#include <linux/of_device.h>
	#include <linux/platform_device.h>

	struct palmas_gpio {
	struct gpio_chip gpio_chip;
	struct palmas *palmas;
	};

	struct palmas_device_data {
	int ngpio;
	};

	static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
	{
	struct palmas_gpio *pg = gpiochip_get_data(gc);
	struct palmas *palmas = pg->palmas;
	unsigned int val;
	int ret;
	unsigned int reg;
	int gpio16 = (offset/8);

	offset %= 8;
	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
	if (ret < 0) {
	dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
	return ret;
	}

	if (val & BIT(offset))
	reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT;
	else
	reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN;

	ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val);
	if (ret < 0) {
	dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret);
	return ret;
	}
	return !!(val & BIT(offset));
	}

	static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
	int value)
	{
	struct palmas_gpio *pg = gpiochip_get_data(gc);
	struct palmas *palmas = pg->palmas;
	int ret;
	unsigned int reg;
	int gpio16 = (offset/8);

	offset %= 8;
	if (gpio16)
	reg = (value) ?
	PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2;
	else
	reg = (value) ?
	PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT;

	ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset));
	if (ret < 0)
	dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret);
	}

	static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
	int value)
	{
	struct palmas_gpio *pg = gpiochip_get_data(gc);
	struct palmas *palmas = pg->palmas;
	int ret;
	unsigned int reg;
	int gpio16 = (offset/8);

	offset %= 8;
	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

	/* Set the initial value */
	palmas_gpio_set(gc, offset, value);

	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg,
	BIT(offset), BIT(offset));
	if (ret < 0)
	dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
	ret);
	return ret;
	}

	static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
	{
	struct palmas_gpio *pg = gpiochip_get_data(gc);
	struct palmas *palmas = pg->palmas;
	int ret;
	unsigned int reg;
	int gpio16 = (offset/8);

	offset %= 8;
	reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR;

	ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0);
	if (ret < 0)
	dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg,
	ret);
	return ret;
	}

	static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
	{
	struct palmas_gpio *pg = gpiochip_get_data(gc);
	struct palmas *palmas = pg->palmas;

	return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
	}

	static const struct palmas_device_data palmas_dev_data = {
	.ngpio = 8,
	};

	static const struct palmas_device_data tps80036_dev_data = {
	.ngpio = 16,
	};

	static const struct of_device_id of_palmas_gpio_match[] = {
	{ .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,},
	{ .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,},
	{ .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,},
	{ .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,},
	{ },
	};
	MODULE_DEVICE_TABLE(of, of_palmas_gpio_match);

	static int palmas_gpio_probe(struct platform_device *pdev)
	{
	struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
	struct palmas_platform_data *palmas_pdata;
	struct palmas_gpio *palmas_gpio;
	int ret;
	const struct of_device_id *match;
	const struct palmas_device_data *dev_data;

	match = of_match_device(of_palmas_gpio_match, &pdev->dev);
	if (!match)
	return -ENODEV;
	dev_data = match->data;
	if (!dev_data)
	dev_data = &palmas_dev_data;

	palmas_gpio = devm_kzalloc(&pdev->dev,
	sizeof(*palmas_gpio), GFP_KERNEL);
	if (!palmas_gpio)
	return -ENOMEM;

	palmas_gpio->palmas = palmas;
	palmas_gpio->gpio_chip.owner = THIS_MODULE;
	palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
	palmas_gpio->gpio_chip.ngpio = dev_data->ngpio;
	palmas_gpio->gpio_chip.can_sleep = true;
	palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
	palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
	palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
	palmas_gpio->gpio_chip.set = palmas_gpio_set;
	palmas_gpio->gpio_chip.get = palmas_gpio_get;
	palmas_gpio->gpio_chip.parent = &pdev->dev;
	#ifdef CONFIG_OF_GPIO
	palmas_gpio->gpio_chip.of_node = pdev->dev.of_node;
	#endif
	palmas_pdata = dev_get_platdata(palmas->dev);
	if (palmas_pdata && palmas_pdata->gpio_base)
	palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
	else
	palmas_gpio->gpio_chip.base = -1;

	ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip,
	palmas_gpio);
	if (ret < 0) {
	dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
	return ret;
	}

	platform_set_drvdata(pdev, palmas_gpio);
	return ret;
	}

	static struct platform_driver palmas_gpio_driver = {
	.driver.name = "palmas-gpio",
	.driver.owner = THIS_MODULE,
	.driver.of_match_table = of_palmas_gpio_match,
	.probe = palmas_gpio_probe,
	};

	static int __init palmas_gpio_init(void)
	{
	return platform_driver_register(&palmas_gpio_driver);
	}
	subsys_initcall(palmas_gpio_init);

	static void __exit palmas_gpio_exit(void)
	{
	platform_driver_unregister(&palmas_gpio_driver);
	}
	module_exit(palmas_gpio_exit);

	MODULE_ALIAS("platform:palmas-gpio");
	MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
	MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
	MODULE_LICENSE("GPL v2");