Messages in this thread Patch in this message | | | From | Ashish Jangam <> | Date | Tue, 26 Apr 2011 13:56:54 +0530 | Subject | [PATCHv1 -next] GPIO: GPIO module of DA9052 PMIC driver |
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GPIO Driver for Dialog Semiconductor DA9052 PMICs.
Changes made since last submission: . read and write operation moved to MFD
Signed-off-by: Dajun Chen <dchen@diasemi.com> --- diff -Naur linux-next-20110421.orig/drivers/gpio/da9052-gpio.c linux-next-20110421/drivers/gpio/da9052-gpio.c --- linux-next-20110421.orig/drivers/gpio/da9052-gpio.c 1970-01-01 05:00:00.000000000 +0500 +++ linux-next-20110421/drivers/gpio/da9052-gpio.c 2011-04-26 10:08:54.000000000 +0500 @@ -0,0 +1,258 @@ +/* + * GPIO Driver for Dialog DA9052 PMICs + * + * Copyright(c) 2009 Dialog Semiconductor Ltd. + * + * Author: Dajun Chen <dchen@diasemi.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. + * + */ +#include <linux/module.h> +#include <linux/fs.h> +#include <linux/uaccess.h> +#include <linux/platform_device.h> +#include <linux/gpio.h> +#include <linux/syscalls.h> +#include <linux/seq_file.h> + +#include <linux/mfd/da9052/da9052.h> +#include <linux/mfd/da9052/reg.h> +#include <linux/mfd/da9052/pdata.h> +#include <linux/mfd/da9052/gpio.h> + +struct da9052_gpio { + struct da9052 *da9052; + struct gpio_chip gp; +}; + +static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip) +{ + return container_of(chip, struct da9052_gpio, gp); +} + +static unsigned char da9052_gpio_port_odd(unsigned offset) +{ + return offset % 2; +} + +static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset) +{ + struct da9052_gpio *gpio = to_da9052_gpio(gc); + int ret; + int da9052_port_direction = 0; + + ret = da9052_reg_read(gpio->da9052, + DA9052_GPIO_0_1_REG + (offset >> 1)); + if (ret < 0) + return ret; + + if (da9052_gpio_port_odd(offset)) { + da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN; + da9052_port_direction >>= 4; + } + else + da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN; + + switch (da9052_port_direction) { + case DA9052_INPUT: + if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER) + ret = da9052_reg_read(gpio->da9052, + DA9052_STATUS_C_REG); + else + ret = da9052_reg_read(gpio->da9052, + DA9052_STATUS_D_REG); + if (ret < 0) + return ret; + if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset))) + return 1; + else + return 0; + case DA9052_OUTPUT_PUSHPULL: + if (da9052_gpio_port_odd(offset)) + return ret & DA9052_GPIO_ODD_PORT_MODE; + else + return ret & DA9052_GPIO_EVEN_PORT_MODE; + default: + return -EINVAL; + } + +} + +static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value) +{ + struct da9052_gpio *gpio = to_da9052_gpio(gc); + int ret; + unsigned char register_value = 0; + + if (da9052_gpio_port_odd(offset)) { + if (value) + register_value = DA9052_GPIO_ODD_PORT_MODE; + ret = da9052_reg_update(gpio->da9052, (offset >> 1) + + DA9052_GPIO_0_1_REG, + DA9052_GPIO_ODD_PORT_MODE, + register_value); + if (ret != 0) + dev_err(gpio->da9052->dev, + "Failed to updated gpio odd reg,%d", + ret); + } else { + if (value) + register_value = DA9052_GPIO_EVEN_PORT_MODE; + ret = da9052_reg_update(gpio->da9052, (offset >> 1) + + DA9052_GPIO_0_1_REG, + DA9052_GPIO_EVEN_PORT_MODE, + register_value); + if (ret != 0) + dev_err(gpio->da9052->dev, + "Failed to updated gpio even reg,%d", + ret); + } +} + +static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset) +{ + struct da9052_gpio *gpio = to_da9052_gpio(gc); + unsigned char register_value; + int ret; + + /* Format: function - 2 bits type - 1 bit mode - 1 bit */ + register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 | + DA9052_DEBOUNCING_ON << 3; + + if (da9052_gpio_port_odd(offset)) + ret = da9052_reg_update(gpio->da9052, (offset >> 1) + + DA9052_GPIO_0_1_REG, + DA9052_GPIO_MASK_UPPER_NIBBLE, + register_value << + DA9052_GPIO_NIBBLE_SHIFT); + else + ret = da9052_reg_update(gpio->da9052, (offset >> 1) + + DA9052_GPIO_0_1_REG, + DA9052_GPIO_MASK_LOWER_NIBBLE, + register_value); + + return ret; +} + +static int da9052_gpio_direction_output(struct gpio_chip *gc, + unsigned offset, int value) +{ + struct da9052_gpio *gpio = to_da9052_gpio(gc); + unsigned char register_value; + int ret; + + /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */ + register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 | + value << 3; + + if (da9052_gpio_port_odd(offset)) + ret = da9052_reg_update(gpio->da9052, (offset >> 1) + + DA9052_GPIO_0_1_REG, + DA9052_GPIO_MASK_UPPER_NIBBLE, + register_value << + DA9052_GPIO_NIBBLE_SHIFT); + else + ret = da9052_reg_update(gpio->da9052, (offset >> 1) + + DA9052_GPIO_0_1_REG, + DA9052_GPIO_MASK_LOWER_NIBBLE, + register_value); + + return ret; +} + +static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset) +{ + struct da9052_gpio *gpio; + gpio = to_da9052_gpio(gc); + + return gpio->gp.base + offset; +} + +static int __devinit da9052_gpio_probe(struct platform_device *pdev) +{ + + struct da9052_gpio *gpio; + struct da9052_pdata *pdata; + int ret; + + gpio = kzalloc(sizeof(*gpio), GFP_KERNEL); + if (gpio == NULL) + return -ENOMEM; + + gpio->da9052 = dev_get_drvdata(pdev->dev.parent); + pdata = gpio->da9052->dev->platform_data; + + if (pdata == NULL) { + dev_err(&pdev->dev, "failed no platform data for GPIO\n"); + ret = -ENOMEM; + goto err_mem; + } + + gpio->da9052 = dev_get_drvdata(pdev->dev.parent); + gpio->gp.get = da9052_gpio_get; + gpio->gp.set = da9052_gpio_set; + gpio->gp.base = pdata->gpio_base; + gpio->gp.ngpio = pdata->num_gpio; + gpio->gp.can_sleep = 1; + gpio->gp.to_irq = da9052_gpio_to_irq; + gpio->gp.dev = &pdev->dev; + gpio->gp.owner = THIS_MODULE; + gpio->gp.label = "da9052-gpio"; + gpio->gp.direction_input = da9052_gpio_direction_input; + gpio->gp.direction_output = da9052_gpio_direction_output; + + ret = gpiochip_add(&gpio->gp); + if (ret < 0) { + dev_err(&pdev->dev, "Could not register gpiochip, %d\n", + ret); + goto err_mem; + } + platform_set_drvdata(pdev, gpio); + + return 0; + +err_mem: + kfree(gpio); + return ret; +} + +static int __devexit da9052_gpio_remove(struct platform_device *pdev) +{ + struct da9052_gpio *gpio = platform_get_drvdata(pdev); + int ret; + + ret = gpiochip_remove(&gpio->gp); + if (ret == 0) + kfree(gpio); + + return ret; +} + +static struct platform_driver da9052_gpio_driver = { + .driver.name = "da9052-gpio", + .driver.owner = THIS_MODULE, + .probe = da9052_gpio_probe, + .remove = __devexit_p(da9052_gpio_remove), +}; + +static int __init da9052_gpio_init(void) +{ + return platform_driver_register(&da9052_gpio_driver); +} + +static void __exit da9052_gpio_exit(void) +{ + return platform_driver_unregister(&da9052_gpio_driver); +} + +module_init(da9052_gpio_init); +module_exit(da9052_gpio_exit); + +MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); +MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9052-gpio"); diff -Naur linux-next-20110421.orig/drivers/gpio/Kconfig linux-next-20110421/drivers/gpio/Kconfig --- linux-next-20110421.orig/drivers/gpio/Kconfig 2011-04-26 09:34:21.000000000 +0500 +++ linux-next-20110421/drivers/gpio/Kconfig 2011-04-26 10:23:17.000000000 +0500 @@ -75,6 +75,12 @@ help Say yes here to support basic memory-mapped GPIO controllers.
+config GPIO_DA9052 + bool "Dialog DA9052 GPIO" + depends on PMIC_DA9052 + help + Say Y to enable the GPIO driver for the DA9052 chip + config GPIO_IT8761E tristate "IT8761E GPIO support" depends on GPIOLIB diff -Naur linux-next-20110421.orig/drivers/gpio/Makefile linux-next-20110421/drivers/gpio/Makefile --- linux-next-20110421.orig/drivers/gpio/Makefile 2011-04-26 09:34:21.000000000 +0500 +++ linux-next-20110421/drivers/gpio/Makefile 2011-04-26 10:13:02.000000000 +0500 @@ -11,6 +11,7 @@ obj-$(CONFIG_GPIO_ADP5520) += adp5520-gpio.o obj-$(CONFIG_GPIO_ADP5588) += adp5588-gpio.o obj-$(CONFIG_GPIO_BASIC_MMIO) += basic_mmio_gpio.o +obj-$(CONFIG_GPIO_DA9052) += da9052-gpio.o obj-$(CONFIG_GPIO_LANGWELL) += langwell_gpio.o obj-$(CONFIG_GPIO_MAX730X) += max730x.o obj-$(CONFIG_GPIO_MAX7300) += max7300.o diff -Naur linux-next-20110421.orig/include/linux/mfd/da9052/gpio.h linux-next-20110421/include/linux/mfd/da9052/gpio.h --- linux-next-20110421.orig/include/linux/mfd/da9052/gpio.h 1970-01-01 05:00:00.000000000 +0500 +++ linux-next-20110421/include/linux/mfd/da9052/gpio.h 2011-04-26 10:27:59.000000000 +0500 @@ -0,0 +1,47 @@ +/* + * include/linux/mfd/da9052/gpio.h -- GPIO for DA9052 + * + * Copyright(c) 2009 Dialog Semiconductor Ltd. + * + * Author: Dajun Chen <dchen@diasemi.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., 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#ifndef __LINUX_MFD_DA9052_GPIO_H +#define __LINUX_MFD_DA9052_GPIO_H + +#define DA9052_INPUT 1 +#define DA9052_OUTPUT_OPENDRAIN 2 +#define DA9052_OUTPUT_PUSHPULL 3 + +#define DA9052_SUPPLY_VDD_IO1 0 + +#define DA9052_DEBOUNCING_OFF 0 +#define DA9052_DEBOUNCING_ON 1 + +#define DA9052_OUTPUT_LOWLEVEL 0 + +#define DA9052_ACTIVE_LOW 0 +#define DA9052_ACTIVE_HIGH 1 + +#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8 +#define DA9052_GPIO_SHIFT_COUNT(no) (no%8) +#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0 +#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F +#define DA9052_GPIO_NIBBLE_SHIFT 4 + +#endif
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