1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * TI Palma series PMIC's GPIO driver. 4 * 5 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. 6 * 7 * Author: Laxman Dewangan <ldewangan@nvidia.com> 8 */ 9 10 #include <linux/gpio/driver.h> 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/mfd/palmas.h> 14 #include <linux/of.h> 15 #include <linux/of_device.h> 16 #include <linux/platform_device.h> 17 18 struct palmas_gpio { 19 struct gpio_chip gpio_chip; 20 struct palmas *palmas; 21 }; 22 23 struct palmas_device_data { 24 int ngpio; 25 }; 26 27 static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset) 28 { 29 struct palmas_gpio *pg = gpiochip_get_data(gc); 30 struct palmas *palmas = pg->palmas; 31 unsigned int val; 32 int ret; 33 unsigned int reg; 34 int gpio16 = (offset/8); 35 36 offset %= 8; 37 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; 38 39 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val); 40 if (ret < 0) { 41 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret); 42 return ret; 43 } 44 45 if (val & BIT(offset)) 46 reg = (gpio16) ? PALMAS_GPIO_DATA_OUT2 : PALMAS_GPIO_DATA_OUT; 47 else 48 reg = (gpio16) ? PALMAS_GPIO_DATA_IN2 : PALMAS_GPIO_DATA_IN; 49 50 ret = palmas_read(palmas, PALMAS_GPIO_BASE, reg, &val); 51 if (ret < 0) { 52 dev_err(gc->parent, "Reg 0x%02x read failed, %d\n", reg, ret); 53 return ret; 54 } 55 return !!(val & BIT(offset)); 56 } 57 58 static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset, 59 int value) 60 { 61 struct palmas_gpio *pg = gpiochip_get_data(gc); 62 struct palmas *palmas = pg->palmas; 63 int ret; 64 unsigned int reg; 65 int gpio16 = (offset/8); 66 67 offset %= 8; 68 if (gpio16) 69 reg = (value) ? 70 PALMAS_GPIO_SET_DATA_OUT2 : PALMAS_GPIO_CLEAR_DATA_OUT2; 71 else 72 reg = (value) ? 73 PALMAS_GPIO_SET_DATA_OUT : PALMAS_GPIO_CLEAR_DATA_OUT; 74 75 ret = palmas_write(palmas, PALMAS_GPIO_BASE, reg, BIT(offset)); 76 if (ret < 0) 77 dev_err(gc->parent, "Reg 0x%02x write failed, %d\n", reg, ret); 78 } 79 80 static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset, 81 int value) 82 { 83 struct palmas_gpio *pg = gpiochip_get_data(gc); 84 struct palmas *palmas = pg->palmas; 85 int ret; 86 unsigned int reg; 87 int gpio16 = (offset/8); 88 89 offset %= 8; 90 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; 91 92 /* Set the initial value */ 93 palmas_gpio_set(gc, offset, value); 94 95 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, 96 BIT(offset), BIT(offset)); 97 if (ret < 0) 98 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg, 99 ret); 100 return ret; 101 } 102 103 static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset) 104 { 105 struct palmas_gpio *pg = gpiochip_get_data(gc); 106 struct palmas *palmas = pg->palmas; 107 int ret; 108 unsigned int reg; 109 int gpio16 = (offset/8); 110 111 offset %= 8; 112 reg = (gpio16) ? PALMAS_GPIO_DATA_DIR2 : PALMAS_GPIO_DATA_DIR; 113 114 ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE, reg, BIT(offset), 0); 115 if (ret < 0) 116 dev_err(gc->parent, "Reg 0x%02x update failed, %d\n", reg, 117 ret); 118 return ret; 119 } 120 121 static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset) 122 { 123 struct palmas_gpio *pg = gpiochip_get_data(gc); 124 struct palmas *palmas = pg->palmas; 125 126 return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset); 127 } 128 129 static const struct palmas_device_data palmas_dev_data = { 130 .ngpio = 8, 131 }; 132 133 static const struct palmas_device_data tps80036_dev_data = { 134 .ngpio = 16, 135 }; 136 137 static const struct of_device_id of_palmas_gpio_match[] = { 138 { .compatible = "ti,palmas-gpio", .data = &palmas_dev_data,}, 139 { .compatible = "ti,tps65913-gpio", .data = &palmas_dev_data,}, 140 { .compatible = "ti,tps65914-gpio", .data = &palmas_dev_data,}, 141 { .compatible = "ti,tps80036-gpio", .data = &tps80036_dev_data,}, 142 { }, 143 }; 144 145 static int palmas_gpio_probe(struct platform_device *pdev) 146 { 147 struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); 148 struct palmas_platform_data *palmas_pdata; 149 struct palmas_gpio *palmas_gpio; 150 int ret; 151 const struct palmas_device_data *dev_data; 152 153 dev_data = of_device_get_match_data(&pdev->dev); 154 if (!dev_data) 155 dev_data = &palmas_dev_data; 156 157 palmas_gpio = devm_kzalloc(&pdev->dev, 158 sizeof(*palmas_gpio), GFP_KERNEL); 159 if (!palmas_gpio) 160 return -ENOMEM; 161 162 palmas_gpio->palmas = palmas; 163 palmas_gpio->gpio_chip.owner = THIS_MODULE; 164 palmas_gpio->gpio_chip.label = dev_name(&pdev->dev); 165 palmas_gpio->gpio_chip.ngpio = dev_data->ngpio; 166 palmas_gpio->gpio_chip.can_sleep = true; 167 palmas_gpio->gpio_chip.direction_input = palmas_gpio_input; 168 palmas_gpio->gpio_chip.direction_output = palmas_gpio_output; 169 palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq; 170 palmas_gpio->gpio_chip.set = palmas_gpio_set; 171 palmas_gpio->gpio_chip.get = palmas_gpio_get; 172 palmas_gpio->gpio_chip.parent = &pdev->dev; 173 174 palmas_pdata = dev_get_platdata(palmas->dev); 175 if (palmas_pdata && palmas_pdata->gpio_base) 176 palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base; 177 else 178 palmas_gpio->gpio_chip.base = -1; 179 180 ret = devm_gpiochip_add_data(&pdev->dev, &palmas_gpio->gpio_chip, 181 palmas_gpio); 182 if (ret < 0) { 183 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 184 return ret; 185 } 186 187 platform_set_drvdata(pdev, palmas_gpio); 188 return ret; 189 } 190 191 static struct platform_driver palmas_gpio_driver = { 192 .driver.name = "palmas-gpio", 193 .driver.of_match_table = of_palmas_gpio_match, 194 .probe = palmas_gpio_probe, 195 }; 196 197 static int __init palmas_gpio_init(void) 198 { 199 return platform_driver_register(&palmas_gpio_driver); 200 } 201 subsys_initcall(palmas_gpio_init); 202