/* * GPIO Driver for Dialog DA9052 PMICs. * * Copyright(c) 2011 Dialog Semiconductor Ltd. * * Author: David 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> #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 #define DA9052_IRQ_GPI0 16 #define DA9052_GPIO_ODD_SHIFT 7 #define DA9052_GPIO_EVEN_SHIFT 3 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 da9052_port_direction = 0; int ret; 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; if (da9052_gpio_port_odd(offset)) { ret = da9052_reg_update(gpio->da9052, (offset >> 1) + DA9052_GPIO_0_1_REG, DA9052_GPIO_ODD_PORT_MODE, value << DA9052_GPIO_ODD_SHIFT); if (ret != 0) dev_err(gpio->da9052->dev, "Failed to updated gpio odd reg,%d", ret); } else { ret = da9052_reg_update(gpio->da9052, (offset >> 1) + DA9052_GPIO_0_1_REG, DA9052_GPIO_EVEN_PORT_MODE, value << DA9052_GPIO_EVEN_SHIFT); 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 = to_da9052_gpio(gc); struct da9052 *da9052 = gpio->da9052; return da9052->irq_base + DA9052_IRQ_GPI0 + offset; } static struct gpio_chip reference_gp __devinitdata = { .label = "da9052-gpio", .owner = THIS_MODULE, .get = da9052_gpio_get, .set = da9052_gpio_set, .direction_input = da9052_gpio_direction_input, .direction_output = da9052_gpio_direction_output, .to_irq = da9052_gpio_to_irq, .can_sleep = 1, .ngpio = 16, .base = -1, }; 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; gpio->gp = reference_gp; if (pdata && pdata->gpio_base) gpio->gp.base = pdata->gpio_base; 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 = { .probe = da9052_gpio_probe, .remove = __devexit_p(da9052_gpio_remove), .driver = { .name = "da9052-gpio", .owner = THIS_MODULE, }, }; module_platform_driver(da9052_gpio_driver); MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:da9052-gpio");