1 /* 2 * Copyright 2011 Texas Instruments Inc. 3 * 4 * Author: Margarita Olaya <magi@slimlogic.co.uk> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 * 11 * This driver is based on wm8350 implementation. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/errno.h> 17 #include <linux/gpio.h> 18 #include <linux/mfd/core.h> 19 #include <linux/platform_device.h> 20 #include <linux/seq_file.h> 21 #include <linux/slab.h> 22 #include <linux/mfd/tps65912.h> 23 24 struct tps65912_gpio_data { 25 struct tps65912 *tps65912; 26 struct gpio_chip gpio_chip; 27 }; 28 29 static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset) 30 { 31 struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio); 32 int val; 33 34 val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset); 35 36 if (val & GPIO_STS_MASK) 37 return 1; 38 39 return 0; 40 } 41 42 static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset, 43 int value) 44 { 45 struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio); 46 47 if (value) 48 tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset, 49 GPIO_SET_MASK); 50 else 51 tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset, 52 GPIO_SET_MASK); 53 } 54 55 static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset, 56 int value) 57 { 58 struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio); 59 60 /* Set the initial value */ 61 tps65912_gpio_set(gc, offset, value); 62 63 return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset, 64 GPIO_CFG_MASK); 65 } 66 67 static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset) 68 { 69 struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio); 70 71 return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset, 72 GPIO_CFG_MASK); 73 } 74 75 static struct gpio_chip template_chip = { 76 .label = "tps65912", 77 .owner = THIS_MODULE, 78 .direction_input = tps65912_gpio_input, 79 .direction_output = tps65912_gpio_output, 80 .get = tps65912_gpio_get, 81 .set = tps65912_gpio_set, 82 .can_sleep = 1, 83 .ngpio = 5, 84 .base = -1, 85 }; 86 87 static int tps65912_gpio_probe(struct platform_device *pdev) 88 { 89 struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent); 90 struct tps65912_board *pdata = dev_get_platdata(tps65912->dev); 91 struct tps65912_gpio_data *tps65912_gpio; 92 int ret; 93 94 tps65912_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65912_gpio), 95 GFP_KERNEL); 96 if (tps65912_gpio == NULL) 97 return -ENOMEM; 98 99 tps65912_gpio->tps65912 = tps65912; 100 tps65912_gpio->gpio_chip = template_chip; 101 tps65912_gpio->gpio_chip.dev = &pdev->dev; 102 if (pdata && pdata->gpio_base) 103 tps65912_gpio->gpio_chip.base = pdata->gpio_base; 104 105 ret = gpiochip_add(&tps65912_gpio->gpio_chip); 106 if (ret < 0) { 107 dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret); 108 return ret; 109 } 110 111 platform_set_drvdata(pdev, tps65912_gpio); 112 113 return ret; 114 } 115 116 static int tps65912_gpio_remove(struct platform_device *pdev) 117 { 118 struct tps65912_gpio_data *tps65912_gpio = platform_get_drvdata(pdev); 119 120 return gpiochip_remove(&tps65912_gpio->gpio_chip); 121 } 122 123 static struct platform_driver tps65912_gpio_driver = { 124 .driver = { 125 .name = "tps65912-gpio", 126 .owner = THIS_MODULE, 127 }, 128 .probe = tps65912_gpio_probe, 129 .remove = tps65912_gpio_remove, 130 }; 131 132 static int __init tps65912_gpio_init(void) 133 { 134 return platform_driver_register(&tps65912_gpio_driver); 135 } 136 subsys_initcall(tps65912_gpio_init); 137 138 static void __exit tps65912_gpio_exit(void) 139 { 140 platform_driver_unregister(&tps65912_gpio_driver); 141 } 142 module_exit(tps65912_gpio_exit); 143 144 MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>"); 145 MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs"); 146 MODULE_LICENSE("GPL v2"); 147 MODULE_ALIAS("platform:tps65912-gpio"); 148