Laxman Dewangan | 3d50a27 | 2013-01-03 16:16:59 +0530 | [diff] [blame] | 1 | /* |
| 2 | * TI Palma series PMIC's GPIO driver. |
| 3 | * |
| 4 | * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. |
| 5 | * |
| 6 | * Author: Laxman Dewangan <ldewangan@nvidia.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms and conditions of the GNU General Public License, |
| 10 | * version 2, as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 15 | * more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include <linux/gpio.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/mfd/palmas.h> |
| 25 | #include <linux/of.h> |
| 26 | #include <linux/of_device.h> |
| 27 | #include <linux/platform_device.h> |
| 28 | |
| 29 | struct palmas_gpio { |
| 30 | struct gpio_chip gpio_chip; |
| 31 | struct palmas *palmas; |
| 32 | }; |
| 33 | |
| 34 | static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip) |
| 35 | { |
| 36 | return container_of(chip, struct palmas_gpio, gpio_chip); |
| 37 | } |
| 38 | |
| 39 | static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset) |
| 40 | { |
| 41 | struct palmas_gpio *pg = to_palmas_gpio(gc); |
| 42 | struct palmas *palmas = pg->palmas; |
| 43 | unsigned int val; |
| 44 | int ret; |
| 45 | |
Andrew Chew | 8b628c6 | 2013-07-26 13:39:53 -0700 | [diff] [blame^] | 46 | ret = palmas_read(palmas, PALMAS_GPIO_BASE, PALMAS_GPIO_DATA_DIR, &val); |
Laxman Dewangan | 3d50a27 | 2013-01-03 16:16:59 +0530 | [diff] [blame] | 47 | if (ret < 0) { |
Andrew Chew | 8b628c6 | 2013-07-26 13:39:53 -0700 | [diff] [blame^] | 48 | dev_err(gc->dev, "GPIO_DATA_DIR read failed, err = %d\n", ret); |
| 49 | return ret; |
| 50 | } |
| 51 | |
| 52 | if (val & (1 << offset)) { |
| 53 | ret = palmas_read(palmas, PALMAS_GPIO_BASE, |
| 54 | PALMAS_GPIO_DATA_OUT, &val); |
| 55 | } else { |
| 56 | ret = palmas_read(palmas, PALMAS_GPIO_BASE, |
| 57 | PALMAS_GPIO_DATA_IN, &val); |
| 58 | } |
| 59 | if (ret < 0) { |
| 60 | dev_err(gc->dev, "GPIO_DATA_IN/OUT read failed, err = %d\n", |
| 61 | ret); |
Laxman Dewangan | 3d50a27 | 2013-01-03 16:16:59 +0530 | [diff] [blame] | 62 | return ret; |
| 63 | } |
| 64 | return !!(val & BIT(offset)); |
| 65 | } |
| 66 | |
| 67 | static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset, |
| 68 | int value) |
| 69 | { |
| 70 | struct palmas_gpio *pg = to_palmas_gpio(gc); |
| 71 | struct palmas *palmas = pg->palmas; |
| 72 | int ret; |
| 73 | |
| 74 | if (value) |
| 75 | ret = palmas_write(palmas, PALMAS_GPIO_BASE, |
| 76 | PALMAS_GPIO_SET_DATA_OUT, BIT(offset)); |
| 77 | else |
| 78 | ret = palmas_write(palmas, PALMAS_GPIO_BASE, |
| 79 | PALMAS_GPIO_CLEAR_DATA_OUT, BIT(offset)); |
| 80 | if (ret < 0) |
| 81 | dev_err(gc->dev, "%s write failed, err = %d\n", |
| 82 | (value) ? "GPIO_SET_DATA_OUT" : "GPIO_CLEAR_DATA_OUT", |
| 83 | ret); |
| 84 | } |
| 85 | |
| 86 | static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset, |
| 87 | int value) |
| 88 | { |
| 89 | struct palmas_gpio *pg = to_palmas_gpio(gc); |
| 90 | struct palmas *palmas = pg->palmas; |
| 91 | int ret; |
| 92 | |
| 93 | /* Set the initial value */ |
| 94 | palmas_gpio_set(gc, offset, value); |
| 95 | |
| 96 | ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, |
| 97 | PALMAS_GPIO_DATA_DIR, BIT(offset), BIT(offset)); |
| 98 | if (ret < 0) |
| 99 | dev_err(gc->dev, "GPIO_DATA_DIR write failed, err = %d\n", ret); |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset) |
| 104 | { |
| 105 | struct palmas_gpio *pg = to_palmas_gpio(gc); |
| 106 | struct palmas *palmas = pg->palmas; |
| 107 | int ret; |
| 108 | |
| 109 | ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, |
| 110 | PALMAS_GPIO_DATA_DIR, BIT(offset), 0); |
| 111 | if (ret < 0) |
| 112 | dev_err(gc->dev, "GPIO_DATA_DIR write failed, err = %d\n", ret); |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset) |
| 117 | { |
| 118 | struct palmas_gpio *pg = to_palmas_gpio(gc); |
| 119 | struct palmas *palmas = pg->palmas; |
| 120 | |
| 121 | return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset); |
| 122 | } |
| 123 | |
| 124 | static int palmas_gpio_probe(struct platform_device *pdev) |
| 125 | { |
| 126 | struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); |
| 127 | struct palmas_platform_data *palmas_pdata; |
| 128 | struct palmas_gpio *palmas_gpio; |
| 129 | int ret; |
| 130 | |
| 131 | palmas_gpio = devm_kzalloc(&pdev->dev, |
| 132 | sizeof(*palmas_gpio), GFP_KERNEL); |
| 133 | if (!palmas_gpio) { |
| 134 | dev_err(&pdev->dev, "Could not allocate palmas_gpio\n"); |
| 135 | return -ENOMEM; |
| 136 | } |
| 137 | |
| 138 | palmas_gpio->palmas = palmas; |
| 139 | palmas_gpio->gpio_chip.owner = THIS_MODULE; |
| 140 | palmas_gpio->gpio_chip.label = dev_name(&pdev->dev); |
| 141 | palmas_gpio->gpio_chip.ngpio = 8; |
| 142 | palmas_gpio->gpio_chip.can_sleep = 1; |
| 143 | palmas_gpio->gpio_chip.direction_input = palmas_gpio_input; |
| 144 | palmas_gpio->gpio_chip.direction_output = palmas_gpio_output; |
| 145 | palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq; |
| 146 | palmas_gpio->gpio_chip.set = palmas_gpio_set; |
| 147 | palmas_gpio->gpio_chip.get = palmas_gpio_get; |
| 148 | palmas_gpio->gpio_chip.dev = &pdev->dev; |
| 149 | #ifdef CONFIG_OF_GPIO |
Laxman Dewangan | 5763318 | 2013-07-23 13:06:04 +0530 | [diff] [blame] | 150 | palmas_gpio->gpio_chip.of_node = pdev->dev.of_node; |
Laxman Dewangan | 3d50a27 | 2013-01-03 16:16:59 +0530 | [diff] [blame] | 151 | #endif |
| 152 | palmas_pdata = dev_get_platdata(palmas->dev); |
| 153 | if (palmas_pdata && palmas_pdata->gpio_base) |
| 154 | palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base; |
| 155 | else |
| 156 | palmas_gpio->gpio_chip.base = -1; |
| 157 | |
| 158 | ret = gpiochip_add(&palmas_gpio->gpio_chip); |
| 159 | if (ret < 0) { |
| 160 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); |
| 161 | return ret; |
| 162 | } |
| 163 | |
| 164 | platform_set_drvdata(pdev, palmas_gpio); |
| 165 | return ret; |
| 166 | } |
| 167 | |
| 168 | static int palmas_gpio_remove(struct platform_device *pdev) |
| 169 | { |
| 170 | struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev); |
| 171 | |
| 172 | return gpiochip_remove(&palmas_gpio->gpio_chip); |
| 173 | } |
| 174 | |
Laxman Dewangan | 5763318 | 2013-07-23 13:06:04 +0530 | [diff] [blame] | 175 | static struct of_device_id of_palmas_gpio_match[] = { |
| 176 | { .compatible = "ti,palmas-gpio"}, |
| 177 | { .compatible = "ti,tps65913-gpio"}, |
| 178 | { .compatible = "ti,tps65914-gpio"}, |
| 179 | { .compatible = "ti,tps80036-gpio"}, |
| 180 | { }, |
| 181 | }; |
| 182 | MODULE_DEVICE_TABLE(of, of_palmas_gpio_match); |
| 183 | |
Laxman Dewangan | 3d50a27 | 2013-01-03 16:16:59 +0530 | [diff] [blame] | 184 | static struct platform_driver palmas_gpio_driver = { |
| 185 | .driver.name = "palmas-gpio", |
| 186 | .driver.owner = THIS_MODULE, |
Laxman Dewangan | 5763318 | 2013-07-23 13:06:04 +0530 | [diff] [blame] | 187 | .driver.of_match_table = of_palmas_gpio_match, |
Laxman Dewangan | 3d50a27 | 2013-01-03 16:16:59 +0530 | [diff] [blame] | 188 | .probe = palmas_gpio_probe, |
| 189 | .remove = palmas_gpio_remove, |
| 190 | }; |
| 191 | |
| 192 | static int __init palmas_gpio_init(void) |
| 193 | { |
| 194 | return platform_driver_register(&palmas_gpio_driver); |
| 195 | } |
| 196 | subsys_initcall(palmas_gpio_init); |
| 197 | |
| 198 | static void __exit palmas_gpio_exit(void) |
| 199 | { |
| 200 | platform_driver_unregister(&palmas_gpio_driver); |
| 201 | } |
| 202 | module_exit(palmas_gpio_exit); |
| 203 | |
| 204 | MODULE_ALIAS("platform:palmas-gpio"); |
| 205 | MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); |
| 206 | MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs"); |
| 207 | MODULE_LICENSE("GPL v2"); |