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_gpio_data *tps65912_gpio = gpiochip_get_data(gc); 32 struct tps65912 *tps65912 = tps65912_gpio->tps65912; 33 int val; 34 35 val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset); 36 37 if (val & GPIO_STS_MASK) 38 return 1; 39 40 return 0; 41 } 42 43 static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset, 44 int value) 45 { 46 struct tps65912_gpio_data *tps65912_gpio = gpiochip_get_data(gc); 47 struct tps65912 *tps65912 = tps65912_gpio->tps65912; 48 49 if (value) 50 tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset, 51 GPIO_SET_MASK); 52 else 53 tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset, 54 GPIO_SET_MASK); 55 } 56 57 static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset, 58 int value) 59 { 60 struct tps65912_gpio_data *tps65912_gpio = gpiochip_get_data(gc); 61 struct tps65912 *tps65912 = tps65912_gpio->tps65912; 62 63 /* Set the initial value */ 64 tps65912_gpio_set(gc, offset, value); 65 66 return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset, 67 GPIO_CFG_MASK); 68 } 69 70 static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset) 71 { 72 struct tps65912_gpio_data *tps65912_gpio = gpiochip_get_data(gc); 73 struct tps65912 *tps65912 = tps65912_gpio->tps65912; 74 75 return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset, 76 GPIO_CFG_MASK); 77 } 78 79 static struct gpio_chip template_chip = { 80 .label = "tps65912", 81 .owner = THIS_MODULE, 82 .direction_input = tps65912_gpio_input, 83 .direction_output = tps65912_gpio_output, 84 .get = tps65912_gpio_get, 85 .set = tps65912_gpio_set, 86 .can_sleep = true, 87 .ngpio = 5, 88 .base = -1, 89 }; 90 91 static int tps65912_gpio_probe(struct platform_device *pdev) 92 { 93 struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent); 94 struct tps65912_board *pdata = dev_get_platdata(tps65912->dev); 95 struct tps65912_gpio_data *tps65912_gpio; 96 int ret; 97 98 tps65912_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65912_gpio), 99 GFP_KERNEL); 100 if (tps65912_gpio == NULL) 101 return -ENOMEM; 102 103 tps65912_gpio->tps65912 = tps65912; 104 tps65912_gpio->gpio_chip = template_chip; 105 tps65912_gpio->gpio_chip.parent = &pdev->dev; 106 if (pdata && pdata->gpio_base) 107 tps65912_gpio->gpio_chip.base = pdata->gpio_base; 108 109 ret = gpiochip_add_data(&tps65912_gpio->gpio_chip, tps65912_gpio); 110 if (ret < 0) { 111 dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret); 112 return ret; 113 } 114 115 platform_set_drvdata(pdev, tps65912_gpio); 116 117 return ret; 118 } 119 120 static int tps65912_gpio_remove(struct platform_device *pdev) 121 { 122 struct tps65912_gpio_data *tps65912_gpio = platform_get_drvdata(pdev); 123 124 gpiochip_remove(&tps65912_gpio->gpio_chip); 125 return 0; 126 } 127 128 static struct platform_driver tps65912_gpio_driver = { 129 .driver = { 130 .name = "tps65912-gpio", 131 }, 132 .probe = tps65912_gpio_probe, 133 .remove = tps65912_gpio_remove, 134 }; 135 136 static int __init tps65912_gpio_init(void) 137 { 138 return platform_driver_register(&tps65912_gpio_driver); 139 } 140 subsys_initcall(tps65912_gpio_init); 141 142 static void __exit tps65912_gpio_exit(void) 143 { 144 platform_driver_unregister(&tps65912_gpio_driver); 145 } 146 module_exit(tps65912_gpio_exit); 147 148 MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>"); 149 MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs"); 150 MODULE_LICENSE("GPL v2"); 151 MODULE_ALIAS("platform:tps65912-gpio"); 152