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 46 ret = palmas_read(palmas, PALMAS_GPIO_BASE, PALMAS_GPIO_DATA_DIR, &val); 47 if (ret < 0) { 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); 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 150 palmas_gpio->gpio_chip.of_node = pdev->dev.of_node; 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 } 174 175 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); 183 184 static struct platform_driver palmas_gpio_driver = { 185 .driver.name = "palmas-gpio", 186 .driver.owner = THIS_MODULE, 187 .driver.of_match_table = of_palmas_gpio_match, 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"); 208