1/* 2 * wm835x-gpiolib.c -- gpiolib support for Wolfson WM835x PMICs 3 * 4 * Copyright 2009 Wolfson Microelectronics PLC. 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 15#include <linux/kernel.h> 16#include <linux/slab.h> 17#include <linux/module.h> 18#include <linux/gpio.h> 19#include <linux/mfd/core.h> 20#include <linux/platform_device.h> 21#include <linux/seq_file.h> 22 23#include <linux/mfd/wm8350/core.h> 24#include <linux/mfd/wm8350/gpio.h> 25 26struct wm8350_gpio_data { 27 struct wm8350 *wm8350; 28 struct gpio_chip gpio_chip; 29}; 30 31static inline struct wm8350_gpio_data *to_wm8350_gpio(struct gpio_chip *chip) 32{ 33 return container_of(chip, struct wm8350_gpio_data, gpio_chip); 34} 35 36static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 37{ 38 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 39 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 40 41 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 42 1 << offset); 43} 44 45static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) 46{ 47 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 48 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 49 int ret; 50 51 ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); 52 if (ret < 0) 53 return ret; 54 55 if (ret & (1 << offset)) 56 return 1; 57 else 58 return 0; 59} 60 61static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 62{ 63 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 64 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 65 66 if (value) 67 wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 68 else 69 wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 70} 71 72static int wm8350_gpio_direction_out(struct gpio_chip *chip, 73 unsigned offset, int value) 74{ 75 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 76 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 77 int ret; 78 79 ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 80 1 << offset); 81 if (ret < 0) 82 return ret; 83 84 /* Don't have an atomic direction/value setup */ 85 wm8350_gpio_set(chip, offset, value); 86 87 return 0; 88} 89 90static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 91{ 92 struct wm8350_gpio_data *wm8350_gpio = to_wm8350_gpio(chip); 93 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 94 95 if (!wm8350->irq_base) 96 return -EINVAL; 97 98 return wm8350->irq_base + WM8350_IRQ_GPIO(offset); 99} 100 101static struct gpio_chip template_chip = { 102 .label = "wm8350", 103 .owner = THIS_MODULE, 104 .direction_input = wm8350_gpio_direction_in, 105 .get = wm8350_gpio_get, 106 .direction_output = wm8350_gpio_direction_out, 107 .set = wm8350_gpio_set, 108 .to_irq = wm8350_gpio_to_irq, 109 .can_sleep = 1, 110}; 111 112static int __devinit wm8350_gpio_probe(struct platform_device *pdev) 113{ 114 struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); 115 struct wm8350_platform_data *pdata = wm8350->dev->platform_data; 116 struct wm8350_gpio_data *wm8350_gpio; 117 int ret; 118 119 wm8350_gpio = kzalloc(sizeof(*wm8350_gpio), GFP_KERNEL); 120 if (wm8350_gpio == NULL) 121 return -ENOMEM; 122 123 wm8350_gpio->wm8350 = wm8350; 124 wm8350_gpio->gpio_chip = template_chip; 125 wm8350_gpio->gpio_chip.ngpio = 13; 126 wm8350_gpio->gpio_chip.dev = &pdev->dev; 127 if (pdata && pdata->gpio_base) 128 wm8350_gpio->gpio_chip.base = pdata->gpio_base; 129 else 130 wm8350_gpio->gpio_chip.base = -1; 131 132 ret = gpiochip_add(&wm8350_gpio->gpio_chip); 133 if (ret < 0) { 134 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", 135 ret); 136 goto err; 137 } 138 139 platform_set_drvdata(pdev, wm8350_gpio); 140 141 return ret; 142 143err: 144 kfree(wm8350_gpio); 145 return ret; 146} 147 148static int __devexit wm8350_gpio_remove(struct platform_device *pdev) 149{ 150 struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev); 151 int ret; 152 153 ret = gpiochip_remove(&wm8350_gpio->gpio_chip); 154 if (ret == 0) 155 kfree(wm8350_gpio); 156 157 return ret; 158} 159 160static struct platform_driver wm8350_gpio_driver = { 161 .driver.name = "wm8350-gpio", 162 .driver.owner = THIS_MODULE, 163 .probe = wm8350_gpio_probe, 164 .remove = __devexit_p(wm8350_gpio_remove), 165}; 166 167static int __init wm8350_gpio_init(void) 168{ 169 return platform_driver_register(&wm8350_gpio_driver); 170} 171subsys_initcall(wm8350_gpio_init); 172 173static void __exit wm8350_gpio_exit(void) 174{ 175 platform_driver_unregister(&wm8350_gpio_driver); 176} 177module_exit(wm8350_gpio_exit); 178 179MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 180MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); 181MODULE_LICENSE("GPL"); 182MODULE_ALIAS("platform:wm8350-gpio"); 183