1 /* 2 * 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 26 struct wm8350_gpio_data { 27 struct wm8350 *wm8350; 28 struct gpio_chip gpio_chip; 29 }; 30 31 static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 32 { 33 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 34 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 35 36 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 37 1 << offset); 38 } 39 40 static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) 41 { 42 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 43 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 44 int ret; 45 46 ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); 47 if (ret < 0) 48 return ret; 49 50 if (ret & (1 << offset)) 51 return 1; 52 else 53 return 0; 54 } 55 56 static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 57 { 58 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 59 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 60 61 if (value) 62 wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 63 else 64 wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 65 } 66 67 static int wm8350_gpio_direction_out(struct gpio_chip *chip, 68 unsigned offset, int value) 69 { 70 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 71 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 72 int ret; 73 74 ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 75 1 << offset); 76 if (ret < 0) 77 return ret; 78 79 /* Don't have an atomic direction/value setup */ 80 wm8350_gpio_set(chip, offset, value); 81 82 return 0; 83 } 84 85 static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 86 { 87 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 88 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 89 90 if (!wm8350->irq_base) 91 return -EINVAL; 92 93 return wm8350->irq_base + WM8350_IRQ_GPIO(offset); 94 } 95 96 static struct gpio_chip template_chip = { 97 .label = "wm8350", 98 .owner = THIS_MODULE, 99 .direction_input = wm8350_gpio_direction_in, 100 .get = wm8350_gpio_get, 101 .direction_output = wm8350_gpio_direction_out, 102 .set = wm8350_gpio_set, 103 .to_irq = wm8350_gpio_to_irq, 104 .can_sleep = true, 105 }; 106 107 static int wm8350_gpio_probe(struct platform_device *pdev) 108 { 109 struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); 110 struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev); 111 struct wm8350_gpio_data *wm8350_gpio; 112 int ret; 113 114 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), 115 GFP_KERNEL); 116 if (wm8350_gpio == NULL) 117 return -ENOMEM; 118 119 wm8350_gpio->wm8350 = wm8350; 120 wm8350_gpio->gpio_chip = template_chip; 121 wm8350_gpio->gpio_chip.ngpio = 13; 122 wm8350_gpio->gpio_chip.parent = &pdev->dev; 123 if (pdata && pdata->gpio_base) 124 wm8350_gpio->gpio_chip.base = pdata->gpio_base; 125 else 126 wm8350_gpio->gpio_chip.base = -1; 127 128 ret = gpiochip_add_data(&wm8350_gpio->gpio_chip, wm8350_gpio); 129 if (ret < 0) { 130 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 131 return ret; 132 } 133 134 platform_set_drvdata(pdev, wm8350_gpio); 135 136 return ret; 137 } 138 139 static int wm8350_gpio_remove(struct platform_device *pdev) 140 { 141 struct wm8350_gpio_data *wm8350_gpio = platform_get_drvdata(pdev); 142 143 gpiochip_remove(&wm8350_gpio->gpio_chip); 144 return 0; 145 } 146 147 static struct platform_driver wm8350_gpio_driver = { 148 .driver.name = "wm8350-gpio", 149 .driver.owner = THIS_MODULE, 150 .probe = wm8350_gpio_probe, 151 .remove = wm8350_gpio_remove, 152 }; 153 154 static int __init wm8350_gpio_init(void) 155 { 156 return platform_driver_register(&wm8350_gpio_driver); 157 } 158 subsys_initcall(wm8350_gpio_init); 159 160 static void __exit wm8350_gpio_exit(void) 161 { 162 platform_driver_unregister(&wm8350_gpio_driver); 163 } 164 module_exit(wm8350_gpio_exit); 165 166 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 167 MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); 168 MODULE_LICENSE("GPL"); 169 MODULE_ALIAS("platform:wm8350-gpio"); 170