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 struct palmas_device_data { 35 int ngpio; 36 }; 37 38 static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip) 39 { 40 return container_of(chip, struct palmas_gpio, gpio_chip); 41 } 42 43 static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset) 44 { 45 struct palmas_gpio *pg = to_palmas_gpio(gc); 46 struct palmas *palmas = pg->palmas; 47 unsigned int val; 48 int ret; 49 unsigned int reg; 50 int gpio16 = (offset/8); 51 52 offset %= 8; 53 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; 54 55 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val); 56 if (ret < 0) { 57 dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret); 58 return ret; 59 } 60 61 if (val & BIT(offset)) 62 reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT; 63 else 64 reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN; 65 66 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val); 67 if (ret < 0) { 68 dev_err(gc->dev, "Reg 0x%02x read failed, %d\n", reg, ret); 69 return ret; 70 } 71 return !!(val & BIT(offset)); 72 } 73 74 static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset, 75 int value) 76 { 77 struct palmas_gpio *pg = to_palmas_gpio(gc); 78 struct palmas *palmas = pg->palmas; 79 int ret; 80 unsigned int reg; 81 int gpio16 = (offset/8); 82 83 offset %= 8; 84 if (gpio16) 85 reg = (value) ? 86 PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2; 87 else 88 reg = (value) ? 89 PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT; 90 91 ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset)); 92 if (ret < 0) 93 dev_err(gc->dev, "Reg 0x%02x write failed, %d\n", reg, ret); 94 } 95 96 static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset, 97 int value) 98 { 99 struct palmas_gpio *pg = to_palmas_gpio(gc); 100 struct palmas *palmas = pg->palmas; 101 int ret; 102 unsigned int reg; 103 int gpio16 = (offset/8); 104 105 offset %= 8; 106 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; 107 108 /* Set the initial value */ 109 palmas_gpio_set(gc, offset, value); 110 111 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, 112 BIT(offset), BIT(offset)); 113 if (ret < 0) 114 dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret); 115 return ret; 116 } 117 118 static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset) 119 { 120 struct palmas_gpio *pg = to_palmas_gpio(gc); 121 struct palmas *palmas = pg->palmas; 122 int ret; 123 unsigned int reg; 124 int gpio16 = (offset/8); 125 126 offset %= 8; 127 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; 128 129 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0); 130 if (ret < 0) 131 dev_err(gc->dev, "Reg 0x%02x update failed, %d\n", reg, ret); 132 return ret; 133 } 134 135 static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset) 136 { 137 struct palmas_gpio *pg = to_palmas_gpio(gc); 138 struct palmas *palmas = pg->palmas; 139 140 return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset); 141 } 142 143 static const struct palmas_device_data palmas_dev_data = { 144 .ngpio = 8, 145 }; 146 147 static const struct palmas_device_data tps80036_dev_data = { 148 .ngpio = 16, 149 }; 150 151 static const struct of_device_id of_palmas_gpio_match[] = { 152 { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,}, 153 { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,}, 154 { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,}, 155 { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,}, 156 { }, 157 }; 158 MODULE_DEVICE_TABLE(of, of_palmas_gpio_match); 159 160 static int palmas_gpio_probe(struct platform_device *pdev) 161 { 162 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); 163 struct palmas_platform_data *palmas_pdata; 164 struct palmas_gpio *palmas_gpio; 165 int ret; 166 const struct of_device_id *match; 167 const struct palmas_device_data *dev_data; 168 169 match = of_match_device(of_palmas_gpio_match, &pdev->dev); 170 dev_data = match->data; 171 if (!dev_data) 172 dev_data = &palmas_dev_data; 173 174 palmas_gpio = devm_kzalloc(&pdev->dev, 175 sizeof(*palmas_gpio), GFP_KERNEL); 176 if (!palmas_gpio) 177 return -ENOMEM; 178 179 palmas_gpio->palmas = palmas; 180 palmas_gpio->gpio_chip.owner = THIS_MODULE; 181 palmas_gpio->gpio_chip.label = dev_name(&pdev->dev); 182 palmas_gpio->gpio_chip.ngpio = dev_data->ngpio; 183 palmas_gpio->gpio_chip.can_sleep = true; 184 palmas_gpio->gpio_chip.direction_input = palmas_gpio_input; 185 palmas_gpio->gpio_chip.direction_output = palmas_gpio_output; 186 palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq; 187 palmas_gpio->gpio_chip.set = palmas_gpio_set; 188 palmas_gpio->gpio_chip.get = palmas_gpio_get; 189 palmas_gpio->gpio_chip.dev = &pdev->dev; 190 #ifdef CONFIG_OF_GPIO 191 palmas_gpio->gpio_chip.of_node = pdev->dev.of_node; 192 #endif 193 palmas_pdata = dev_get_platdata(palmas->dev); 194 if (palmas_pdata && palmas_pdata->gpio_base) 195 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base; 196 else 197 palmas_gpio->gpio_chip.base = -1; 198 199 ret = gpiochip_add(&palmas_gpio->gpio_chip); 200 if (ret < 0) { 201 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 202 return ret; 203 } 204 205 platform_set_drvdata(pdev, palmas_gpio); 206 return ret; 207 } 208 209 static int palmas_gpio_remove(struct platform_device *pdev) 210 { 211 struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev); 212 213 gpiochip_remove(&palmas_gpio->gpio_chip); 214 return 0; 215 } 216 217 static struct platform_driver palmas_gpio_driver = { 218 .driver.name = "palmas-gpio", 219 .driver.owner = THIS_MODULE, 220 .driver.of_match_table = of_palmas_gpio_match, 221 .probe = palmas_gpio_probe, 222 .remove = palmas_gpio_remove, 223 }; 224 225 static int __init palmas_gpio_init(void) 226 { 227 return platform_driver_register(&palmas_gpio_driver); 228 } 229 subsys_initcall(palmas_gpio_init); 230 231 static void __exit palmas_gpio_exit(void) 232 { 233 platform_driver_unregister(&palmas_gpio_driver); 234 } 235 module_exit(palmas_gpio_exit); 236 237 MODULE_ALIAS("platform:palmas-gpio"); 238 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 239 MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs"); 240 MODULE_LICENSE("GPL v2"); 241