gpio: Add basic support for TWL6040 GPOs (70ffd691) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/gpio/Kconfig

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		@@ -402,6 +402,13 @@ config GPIO_TWL4030
		Say yes here to access the GPIO signals of various multi-function
		power management chips from Texas Instruments.

		config GPIO_TWL6040
		tristate "TWL6040 GPO"
		depends on TWL6040_CORE
		help
		Say yes here to access the GPO signals of twl6040
		audio chip from Texas Instruments.

		config GPIO_WM831X
		tristate "WM831x GPIOs"
		depends on MFD_WM831X

drivers/gpio/Makefile

+1 −0

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		@@ -67,6 +67,7 @@ obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
		obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
		obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
		obj-$(CONFIG_GPIO_TWL4030) += gpio-twl4030.o
		obj-$(CONFIG_GPIO_TWL6040) += gpio-twl6040.o
		obj-$(CONFIG_GPIO_UCB1400) += gpio-ucb1400.o
		obj-$(CONFIG_GPIO_VR41XX) += gpio-vr41xx.o
		obj-$(CONFIG_GPIO_VX855) += gpio-vx855.o

drivers/gpio/gpio-twl6040.c

0 → 100644

+137 −0

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		/*
		* Access to GPOs on TWL6040 chip
		*
		* Copyright (C) 2012 Texas Instruments, Inc.
		*
		* Authors:
		* Sergio Aguirre <saaguirre@ti.com>
		* Peter Ujfalusi <peter.ujfalusi@ti.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.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/kthread.h>
		#include <linux/irq.h>
		#include <linux/gpio.h>
		#include <linux/platform_device.h>
		#include <linux/of.h>

		#include <linux/mfd/twl6040.h>

		static struct gpio_chip twl6040gpo_chip;

		static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
		{
		struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
		int ret = 0;

		ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
		if (ret < 0)
		return ret;

		return (ret >> offset) & 1;
		}

		static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
		int value)
		{
		/* This only drives GPOs, and can't change direction */
		return 0;
		}

		static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
		{
		struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
		int ret;
		u8 gpoctl;

		ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
		if (ret < 0)
		return;

		if (value)
		gpoctl = ret \| (1 << offset);
		else
		gpoctl = ret & ~(1 << offset);

		twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
		}

		static struct gpio_chip twl6040gpo_chip = {
		.label = "twl6040",
		.owner = THIS_MODULE,
		.get = twl6040gpo_get,
		.direction_output = twl6040gpo_direction_out,
		.set = twl6040gpo_set,
		.can_sleep = 1,
		};

		/----------------------------------------------------------------------/

		static int __devinit gpo_twl6040_probe(struct platform_device *pdev)
		{
		struct twl6040_gpo_data *pdata = pdev->dev.platform_data;
		struct device *twl6040_core_dev = pdev->dev.parent;
		struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
		int ret;

		if (pdata)
		twl6040gpo_chip.base = pdata->gpio_base;
		else
		twl6040gpo_chip.base = -1;

		if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
		twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
		else
		twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */

		twl6040gpo_chip.dev = &pdev->dev;
		#ifdef CONFIG_OF_GPIO
		twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
		#endif

		ret = gpiochip_add(&twl6040gpo_chip);
		if (ret < 0) {
		dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
		twl6040gpo_chip.ngpio = 0;
		}

		return ret;
		}

		static int __devexit gpo_twl6040_remove(struct platform_device *pdev)
		{
		return gpiochip_remove(&twl6040gpo_chip);
		}

		/* Note: this hardware lives inside an I2C-based multi-function device. */
		MODULE_ALIAS("platform:twl6040-gpo");

		static struct platform_driver gpo_twl6040_driver = {
		.driver = {
		.name = "twl6040-gpo",
		.owner = THIS_MODULE,
		},
		.probe = gpo_twl6040_probe,
		.remove = gpo_twl6040_remove,
		};

		module_platform_driver(gpo_twl6040_driver);

		MODULE_AUTHOR("Texas Instruments, Inc.");
		MODULE_DESCRIPTION("GPO interface for TWL6040");
		MODULE_LICENSE("GPL");