1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * gpiolib support for Wolfson WM835x PMICs 4 * 5 * Copyright 2009 Wolfson Microelectronics PLC. 6 * 7 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 8 * 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/slab.h> 13 #include <linux/module.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/mfd/core.h> 16 #include <linux/platform_device.h> 17 #include <linux/seq_file.h> 18 19 #include <linux/mfd/wm8350/core.h> 20 #include <linux/mfd/wm8350/gpio.h> 21 22 struct wm8350_gpio_data { 23 struct wm8350 *wm8350; 24 struct gpio_chip gpio_chip; 25 }; 26 27 static int wm8350_gpio_direction_in(struct gpio_chip *chip, unsigned offset) 28 { 29 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 30 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 31 32 return wm8350_set_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 33 1 << offset); 34 } 35 36 static int wm8350_gpio_get(struct gpio_chip *chip, unsigned offset) 37 { 38 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 39 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 40 int ret; 41 42 ret = wm8350_reg_read(wm8350, WM8350_GPIO_LEVEL); 43 if (ret < 0) 44 return ret; 45 46 if (ret & (1 << offset)) 47 return 1; 48 else 49 return 0; 50 } 51 52 static void wm8350_gpio_set(struct gpio_chip *chip, unsigned offset, int value) 53 { 54 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 55 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 56 57 if (value) 58 wm8350_set_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 59 else 60 wm8350_clear_bits(wm8350, WM8350_GPIO_LEVEL, 1 << offset); 61 } 62 63 static int wm8350_gpio_direction_out(struct gpio_chip *chip, 64 unsigned offset, int value) 65 { 66 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 67 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 68 int ret; 69 70 ret = wm8350_clear_bits(wm8350, WM8350_GPIO_CONFIGURATION_I_O, 71 1 << offset); 72 if (ret < 0) 73 return ret; 74 75 /* Don't have an atomic direction/value setup */ 76 wm8350_gpio_set(chip, offset, value); 77 78 return 0; 79 } 80 81 static int wm8350_gpio_to_irq(struct gpio_chip *chip, unsigned offset) 82 { 83 struct wm8350_gpio_data *wm8350_gpio = gpiochip_get_data(chip); 84 struct wm8350 *wm8350 = wm8350_gpio->wm8350; 85 86 if (!wm8350->irq_base) 87 return -EINVAL; 88 89 return wm8350->irq_base + WM8350_IRQ_GPIO(offset); 90 } 91 92 static const struct gpio_chip template_chip = { 93 .label = "wm8350", 94 .owner = THIS_MODULE, 95 .direction_input = wm8350_gpio_direction_in, 96 .get = wm8350_gpio_get, 97 .direction_output = wm8350_gpio_direction_out, 98 .set = wm8350_gpio_set, 99 .to_irq = wm8350_gpio_to_irq, 100 .can_sleep = true, 101 }; 102 103 static int wm8350_gpio_probe(struct platform_device *pdev) 104 { 105 struct wm8350 *wm8350 = dev_get_drvdata(pdev->dev.parent); 106 struct wm8350_platform_data *pdata = dev_get_platdata(wm8350->dev); 107 struct wm8350_gpio_data *wm8350_gpio; 108 109 wm8350_gpio = devm_kzalloc(&pdev->dev, sizeof(*wm8350_gpio), 110 GFP_KERNEL); 111 if (wm8350_gpio == NULL) 112 return -ENOMEM; 113 114 wm8350_gpio->wm8350 = wm8350; 115 wm8350_gpio->gpio_chip = template_chip; 116 wm8350_gpio->gpio_chip.ngpio = 13; 117 wm8350_gpio->gpio_chip.parent = &pdev->dev; 118 if (pdata && pdata->gpio_base) 119 wm8350_gpio->gpio_chip.base = pdata->gpio_base; 120 else 121 wm8350_gpio->gpio_chip.base = -1; 122 123 return devm_gpiochip_add_data(&pdev->dev, &wm8350_gpio->gpio_chip, wm8350_gpio); 124 } 125 126 static struct platform_driver wm8350_gpio_driver = { 127 .driver.name = "wm8350-gpio", 128 .probe = wm8350_gpio_probe, 129 }; 130 131 static int __init wm8350_gpio_init(void) 132 { 133 return platform_driver_register(&wm8350_gpio_driver); 134 } 135 subsys_initcall(wm8350_gpio_init); 136 137 static void __exit wm8350_gpio_exit(void) 138 { 139 platform_driver_unregister(&wm8350_gpio_driver); 140 } 141 module_exit(wm8350_gpio_exit); 142 143 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 144 MODULE_DESCRIPTION("GPIO interface for WM8350 PMICs"); 145 MODULE_LICENSE("GPL"); 146 MODULE_ALIAS("platform:wm8350-gpio"); 147