drivers/gpio/rdc321x-gpio.c - kernel/msm-4.9 - Gitiles

 /*
  * RDC321x GPIO driver
  *
  * Copyright (C) 2008, Volker Weiss <dev@tintuc.de>
  * Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
  *
  * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
 #include <linux/pci.h>
 #include <linux/gpio.h>
 #include <linux/mfd/rdc321x.h>
 #include <linux/slab.h>

 struct rdc321x_gpio {
 	spinlock_t		lock;
 	struct pci_dev		*sb_pdev;
 	u32			data_reg[2];
 	int			reg1_ctrl_base;
 	int			reg1_data_base;
 	int			reg2_ctrl_base;
 	int			reg2_data_base;
 	struct gpio_chip	chip;
 };

 /* read GPIO pin */
 static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
 {
 	struct rdc321x_gpio *gpch;
 	u32 value = 0;
 	int reg;

 	gpch = container_of(chip, struct rdc321x_gpio, chip);
 	reg = gpio < 32 ? gpch->reg1_data_base : gpch->reg2_data_base;

 	spin_lock(&gpch->lock);
 	pci_write_config_dword(gpch->sb_pdev, reg,
 					gpch->data_reg[gpio < 32 ? 0 : 1]);
 	pci_read_config_dword(gpch->sb_pdev, reg, &value);
 	spin_unlock(&gpch->lock);

 	return (1 << (gpio & 0x1f)) & value ? 1 : 0;
 }

 static void rdc_gpio_set_value_impl(struct gpio_chip *chip,
 				unsigned gpio, int value)
 {
 	struct rdc321x_gpio *gpch;
 	int reg = (gpio < 32) ? 0 : 1;

 	gpch = container_of(chip, struct rdc321x_gpio, chip);

 	if (value)
 		gpch->data_reg[reg] |= 1 << (gpio & 0x1f);
 	else
 		gpch->data_reg[reg] &= ~(1 << (gpio & 0x1f));

 	pci_write_config_dword(gpch->sb_pdev,
 			reg ? gpch->reg2_data_base : gpch->reg1_data_base,
 			gpch->data_reg[reg]);
 }

 /* set GPIO pin to value */
 static void rdc_gpio_set_value(struct gpio_chip *chip,
 				unsigned gpio, int value)
 {
 	struct rdc321x_gpio *gpch;

 	gpch = container_of(chip, struct rdc321x_gpio, chip);
 	spin_lock(&gpch->lock);
 	rdc_gpio_set_value_impl(chip, gpio, value);
 	spin_unlock(&gpch->lock);
 }

 static int rdc_gpio_config(struct gpio_chip *chip,
 				unsigned gpio, int value)
 {
 	struct rdc321x_gpio *gpch;
 	int err;
 	u32 reg;

 	gpch = container_of(chip, struct rdc321x_gpio, chip);

 	spin_lock(&gpch->lock);
 	err = pci_read_config_dword(gpch->sb_pdev, gpio < 32 ?
 			gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, &reg);
 	if (err)
 		goto unlock;

 	reg |= 1 << (gpio & 0x1f);

 	err = pci_write_config_dword(gpch->sb_pdev, gpio < 32 ?
 			gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, reg);
 	if (err)
 		goto unlock;

 	rdc_gpio_set_value_impl(chip, gpio, value);

 unlock:
 	spin_unlock(&gpch->lock);

 	return err;
 }

 /* configure GPIO pin as input */
 static int rdc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
 {
 	return rdc_gpio_config(chip, gpio, 1);
 }

 /*
  * Cache the initial value of both GPIO data registers
  */
 static int __devinit rdc321x_gpio_probe(struct platform_device *pdev)
 {
 	int err;
 	struct resource *r;
 	struct rdc321x_gpio *rdc321x_gpio_dev;
 	struct rdc321x_gpio_pdata *pdata;

 	pdata = pdev->dev.platform_data;
 	if (!pdata) {
 		dev_err(&pdev->dev, "no platform data supplied\n");
 		return -ENODEV;
 	}

 	rdc321x_gpio_dev = kzalloc(sizeof(struct rdc321x_gpio), GFP_KERNEL);
 	if (!rdc321x_gpio_dev) {
 		dev_err(&pdev->dev, "failed to allocate private data\n");
 		return -ENOMEM;
 	}

 	r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg1");
 	if (!r) {
 		dev_err(&pdev->dev, "failed to get gpio-reg1 resource\n");
 		err = -ENODEV;
 		goto out_free;
 	}

 	spin_lock_init(&rdc321x_gpio_dev->lock);
 	rdc321x_gpio_dev->sb_pdev = pdata->sb_pdev;
 	rdc321x_gpio_dev->reg1_ctrl_base = r->start;
 	rdc321x_gpio_dev->reg1_data_base = r->start + 0x4;

 	r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg2");
 	if (!r) {
 		dev_err(&pdev->dev, "failed to get gpio-reg2 resource\n");
 		err = -ENODEV;
 		goto out_free;
 	}

 	rdc321x_gpio_dev->reg2_ctrl_base = r->start;
 	rdc321x_gpio_dev->reg2_data_base = r->start + 0x4;

 	rdc321x_gpio_dev->chip.label = "rdc321x-gpio";
 	rdc321x_gpio_dev->chip.direction_input = rdc_gpio_direction_input;
 	rdc321x_gpio_dev->chip.direction_output = rdc_gpio_config;
 	rdc321x_gpio_dev->chip.get = rdc_gpio_get_value;
 	rdc321x_gpio_dev->chip.set = rdc_gpio_set_value;
 	rdc321x_gpio_dev->chip.base = 0;
 	rdc321x_gpio_dev->chip.ngpio = pdata->max_gpios;

 	platform_set_drvdata(pdev, rdc321x_gpio_dev);

 	/* This might not be, what others (BIOS, bootloader, etc.)
 	   wrote to these registers before, but it's a good guess. Still
 	   better than just using 0xffffffff. */
 	err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
 					rdc321x_gpio_dev->reg1_data_base,
 					&rdc321x_gpio_dev->data_reg[0]);
 	if (err)
 		goto out_drvdata;

 	err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
 					rdc321x_gpio_dev->reg2_data_base,
 					&rdc321x_gpio_dev->data_reg[1]);
 	if (err)
 		goto out_drvdata;

 	dev_info(&pdev->dev, "registering %d GPIOs\n",
 					rdc321x_gpio_dev->chip.ngpio);
 	return gpiochip_add(&rdc321x_gpio_dev->chip);

 out_drvdata:
 	platform_set_drvdata(pdev, NULL);
 out_free:
 	kfree(rdc321x_gpio_dev);
 	return err;
 }

 static int __devexit rdc321x_gpio_remove(struct platform_device *pdev)
 {
 	int ret;
 	struct rdc321x_gpio *rdc321x_gpio_dev = platform_get_drvdata(pdev);

 	ret = gpiochip_remove(&rdc321x_gpio_dev->chip);
 	if (ret)
 		dev_err(&pdev->dev, "failed to unregister chip\n");

 	kfree(rdc321x_gpio_dev);
 	platform_set_drvdata(pdev, NULL);

 	return ret;
 }

 static struct platform_driver rdc321x_gpio_driver = {
 	.driver.name	= "rdc321x-gpio",
 	.driver.owner	= THIS_MODULE,
 	.probe		= rdc321x_gpio_probe,
 	.remove		= __devexit_p(rdc321x_gpio_remove),
 };

 static int __init rdc321x_gpio_init(void)
 {
 	return platform_driver_register(&rdc321x_gpio_driver);
 }

 static void __exit rdc321x_gpio_exit(void)
 {
 	platform_driver_unregister(&rdc321x_gpio_driver);
 }

 module_init(rdc321x_gpio_init);
 module_exit(rdc321x_gpio_exit);

 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 MODULE_DESCRIPTION("RDC321x GPIO driver");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("platform:rdc321x-gpio");
	/*
	* RDC321x GPIO driver
	*
	* Copyright (C) 2008, Volker Weiss <dev@tintuc.de>
	* Copyright (C) 2007-2010 Florian Fainelli <florian@openwrt.org>
	*
	* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	*/
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/spinlock.h>
	#include <linux/platform_device.h>
	#include <linux/pci.h>
	#include <linux/gpio.h>
	#include <linux/mfd/rdc321x.h>
	#include <linux/slab.h>

	struct rdc321x_gpio {
	spinlock_t lock;
	struct pci_dev *sb_pdev;
	u32 data_reg[2];
	int reg1_ctrl_base;
	int reg1_data_base;
	int reg2_ctrl_base;
	int reg2_data_base;
	struct gpio_chip chip;
	};

	/* read GPIO pin */
	static int rdc_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
	{
	struct rdc321x_gpio *gpch;
	u32 value = 0;
	int reg;

	gpch = container_of(chip, struct rdc321x_gpio, chip);
	reg = gpio < 32 ? gpch->reg1_data_base : gpch->reg2_data_base;

	spin_lock(&gpch->lock);
	pci_write_config_dword(gpch->sb_pdev, reg,
	gpch->data_reg[gpio < 32 ? 0 : 1]);
	pci_read_config_dword(gpch->sb_pdev, reg, &value);
	spin_unlock(&gpch->lock);

	return (1 << (gpio & 0x1f)) & value ? 1 : 0;
	}

	static void rdc_gpio_set_value_impl(struct gpio_chip *chip,
	unsigned gpio, int value)
	{
	struct rdc321x_gpio *gpch;
	int reg = (gpio < 32) ? 0 : 1;

	gpch = container_of(chip, struct rdc321x_gpio, chip);

	if (value)
	gpch->data_reg[reg] \|= 1 << (gpio & 0x1f);
	else
	gpch->data_reg[reg] &= ~(1 << (gpio & 0x1f));

	pci_write_config_dword(gpch->sb_pdev,
	reg ? gpch->reg2_data_base : gpch->reg1_data_base,
	gpch->data_reg[reg]);
	}

	/* set GPIO pin to value */
	static void rdc_gpio_set_value(struct gpio_chip *chip,
	unsigned gpio, int value)
	{
	struct rdc321x_gpio *gpch;

	gpch = container_of(chip, struct rdc321x_gpio, chip);
	spin_lock(&gpch->lock);
	rdc_gpio_set_value_impl(chip, gpio, value);
	spin_unlock(&gpch->lock);
	}

	static int rdc_gpio_config(struct gpio_chip *chip,
	unsigned gpio, int value)
	{
	struct rdc321x_gpio *gpch;
	int err;
	u32 reg;

	gpch = container_of(chip, struct rdc321x_gpio, chip);

	spin_lock(&gpch->lock);
	err = pci_read_config_dword(gpch->sb_pdev, gpio < 32 ?
	gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, &reg);
	if (err)
	goto unlock;

	reg \|= 1 << (gpio & 0x1f);

	err = pci_write_config_dword(gpch->sb_pdev, gpio < 32 ?
	gpch->reg1_ctrl_base : gpch->reg2_ctrl_base, reg);
	if (err)
	goto unlock;

	rdc_gpio_set_value_impl(chip, gpio, value);

	unlock:
	spin_unlock(&gpch->lock);

	return err;
	}

	/* configure GPIO pin as input */
	static int rdc_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
	{
	return rdc_gpio_config(chip, gpio, 1);
	}

	/*
	* Cache the initial value of both GPIO data registers
	*/
	static int __devinit rdc321x_gpio_probe(struct platform_device *pdev)
	{
	int err;
	struct resource *r;
	struct rdc321x_gpio *rdc321x_gpio_dev;
	struct rdc321x_gpio_pdata *pdata;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
	dev_err(&pdev->dev, "no platform data supplied\n");
	return -ENODEV;
	}

	rdc321x_gpio_dev = kzalloc(sizeof(struct rdc321x_gpio), GFP_KERNEL);
	if (!rdc321x_gpio_dev) {
	dev_err(&pdev->dev, "failed to allocate private data\n");
	return -ENOMEM;
	}

	r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg1");
	if (!r) {
	dev_err(&pdev->dev, "failed to get gpio-reg1 resource\n");
	err = -ENODEV;
	goto out_free;
	}

	spin_lock_init(&rdc321x_gpio_dev->lock);
	rdc321x_gpio_dev->sb_pdev = pdata->sb_pdev;
	rdc321x_gpio_dev->reg1_ctrl_base = r->start;
	rdc321x_gpio_dev->reg1_data_base = r->start + 0x4;

	r = platform_get_resource_byname(pdev, IORESOURCE_IO, "gpio-reg2");
	if (!r) {
	dev_err(&pdev->dev, "failed to get gpio-reg2 resource\n");
	err = -ENODEV;
	goto out_free;
	}

	rdc321x_gpio_dev->reg2_ctrl_base = r->start;
	rdc321x_gpio_dev->reg2_data_base = r->start + 0x4;

	rdc321x_gpio_dev->chip.label = "rdc321x-gpio";
	rdc321x_gpio_dev->chip.direction_input = rdc_gpio_direction_input;
	rdc321x_gpio_dev->chip.direction_output = rdc_gpio_config;
	rdc321x_gpio_dev->chip.get = rdc_gpio_get_value;
	rdc321x_gpio_dev->chip.set = rdc_gpio_set_value;
	rdc321x_gpio_dev->chip.base = 0;
	rdc321x_gpio_dev->chip.ngpio = pdata->max_gpios;

	platform_set_drvdata(pdev, rdc321x_gpio_dev);

	/* This might not be, what others (BIOS, bootloader, etc.)
	wrote to these registers before, but it's a good guess. Still
	better than just using 0xffffffff. */
	err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
	rdc321x_gpio_dev->reg1_data_base,
	&rdc321x_gpio_dev->data_reg[0]);
	if (err)
	goto out_drvdata;

	err = pci_read_config_dword(rdc321x_gpio_dev->sb_pdev,
	rdc321x_gpio_dev->reg2_data_base,
	&rdc321x_gpio_dev->data_reg[1]);
	if (err)
	goto out_drvdata;

	dev_info(&pdev->dev, "registering %d GPIOs\n",
	rdc321x_gpio_dev->chip.ngpio);
	return gpiochip_add(&rdc321x_gpio_dev->chip);

	out_drvdata:
	platform_set_drvdata(pdev, NULL);
	out_free:
	kfree(rdc321x_gpio_dev);
	return err;
	}

	static int __devexit rdc321x_gpio_remove(struct platform_device *pdev)
	{
	int ret;
	struct rdc321x_gpio *rdc321x_gpio_dev = platform_get_drvdata(pdev);

	ret = gpiochip_remove(&rdc321x_gpio_dev->chip);
	if (ret)
	dev_err(&pdev->dev, "failed to unregister chip\n");

	kfree(rdc321x_gpio_dev);
	platform_set_drvdata(pdev, NULL);

	return ret;
	}

	static struct platform_driver rdc321x_gpio_driver = {
	.driver.name = "rdc321x-gpio",
	.driver.owner = THIS_MODULE,
	.probe = rdc321x_gpio_probe,
	.remove = __devexit_p(rdc321x_gpio_remove),
	};

	static int __init rdc321x_gpio_init(void)
	{
	return platform_driver_register(&rdc321x_gpio_driver);
	}

	static void __exit rdc321x_gpio_exit(void)
	{
	platform_driver_unregister(&rdc321x_gpio_driver);
	}

	module_init(rdc321x_gpio_init);
	module_exit(rdc321x_gpio_exit);

	MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
	MODULE_DESCRIPTION("RDC321x GPIO driver");
	MODULE_LICENSE("GPL");
	MODULE_ALIAS("platform:rdc321x-gpio");