1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * TI TPS6591x GPIO driver 4 * 5 * Copyright 2010 Texas Instruments Inc. 6 * 7 * Author: Graeme Gregory <gg@slimlogic.co.uk> 8 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk> 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/init.h> 13 #include <linux/errno.h> 14 #include <linux/gpio/driver.h> 15 #include <linux/i2c.h> 16 #include <linux/platform_device.h> 17 #include <linux/mfd/tps65910.h> 18 #include <linux/of_device.h> 19 20 struct tps65910_gpio { 21 struct gpio_chip gpio_chip; 22 struct tps65910 *tps65910; 23 }; 24 25 static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset) 26 { 27 struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc); 28 struct tps65910 *tps65910 = tps65910_gpio->tps65910; 29 unsigned int val; 30 31 tps65910_reg_read(tps65910, TPS65910_GPIO0 + offset, &val); 32 33 if (val & GPIO_STS_MASK) 34 return 1; 35 36 return 0; 37 } 38 39 static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset, 40 int value) 41 { 42 struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc); 43 struct tps65910 *tps65910 = tps65910_gpio->tps65910; 44 45 if (value) 46 tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset, 47 GPIO_SET_MASK); 48 else 49 tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset, 50 GPIO_SET_MASK); 51 } 52 53 static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset, 54 int value) 55 { 56 struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc); 57 struct tps65910 *tps65910 = tps65910_gpio->tps65910; 58 59 /* Set the initial value */ 60 tps65910_gpio_set(gc, offset, value); 61 62 return tps65910_reg_set_bits(tps65910, TPS65910_GPIO0 + offset, 63 GPIO_CFG_MASK); 64 } 65 66 static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset) 67 { 68 struct tps65910_gpio *tps65910_gpio = gpiochip_get_data(gc); 69 struct tps65910 *tps65910 = tps65910_gpio->tps65910; 70 71 return tps65910_reg_clear_bits(tps65910, TPS65910_GPIO0 + offset, 72 GPIO_CFG_MASK); 73 } 74 75 #ifdef CONFIG_OF 76 static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev, 77 struct tps65910 *tps65910, int chip_ngpio) 78 { 79 struct tps65910_board *tps65910_board = tps65910->of_plat_data; 80 unsigned int prop_array[TPS6591X_MAX_NUM_GPIO]; 81 int ngpio = min(chip_ngpio, TPS6591X_MAX_NUM_GPIO); 82 int ret; 83 int idx; 84 85 tps65910_board->gpio_base = -1; 86 ret = of_property_read_u32_array(tps65910->dev->of_node, 87 "ti,en-gpio-sleep", prop_array, ngpio); 88 if (ret < 0) { 89 dev_dbg(dev, "ti,en-gpio-sleep not specified\n"); 90 return tps65910_board; 91 } 92 93 for (idx = 0; idx < ngpio; idx++) 94 tps65910_board->en_gpio_sleep[idx] = (prop_array[idx] != 0); 95 96 return tps65910_board; 97 } 98 #else 99 static struct tps65910_board *tps65910_parse_dt_for_gpio(struct device *dev, 100 struct tps65910 *tps65910, int chip_ngpio) 101 { 102 return NULL; 103 } 104 #endif 105 106 static int tps65910_gpio_probe(struct platform_device *pdev) 107 { 108 struct tps65910 *tps65910 = dev_get_drvdata(pdev->dev.parent); 109 struct tps65910_board *pdata = dev_get_platdata(tps65910->dev); 110 struct tps65910_gpio *tps65910_gpio; 111 int ret; 112 int i; 113 114 tps65910_gpio = devm_kzalloc(&pdev->dev, 115 sizeof(*tps65910_gpio), GFP_KERNEL); 116 if (!tps65910_gpio) 117 return -ENOMEM; 118 119 tps65910_gpio->tps65910 = tps65910; 120 121 tps65910_gpio->gpio_chip.owner = THIS_MODULE; 122 tps65910_gpio->gpio_chip.label = tps65910->i2c_client->name; 123 124 switch (tps65910_chip_id(tps65910)) { 125 case TPS65910: 126 tps65910_gpio->gpio_chip.ngpio = TPS65910_NUM_GPIO; 127 break; 128 case TPS65911: 129 tps65910_gpio->gpio_chip.ngpio = TPS65911_NUM_GPIO; 130 break; 131 default: 132 return -EINVAL; 133 } 134 tps65910_gpio->gpio_chip.can_sleep = true; 135 tps65910_gpio->gpio_chip.direction_input = tps65910_gpio_input; 136 tps65910_gpio->gpio_chip.direction_output = tps65910_gpio_output; 137 tps65910_gpio->gpio_chip.set = tps65910_gpio_set; 138 tps65910_gpio->gpio_chip.get = tps65910_gpio_get; 139 tps65910_gpio->gpio_chip.parent = &pdev->dev; 140 #ifdef CONFIG_OF_GPIO 141 tps65910_gpio->gpio_chip.of_node = tps65910->dev->of_node; 142 #endif 143 if (pdata && pdata->gpio_base) 144 tps65910_gpio->gpio_chip.base = pdata->gpio_base; 145 else 146 tps65910_gpio->gpio_chip.base = -1; 147 148 if (!pdata && tps65910->dev->of_node) 149 pdata = tps65910_parse_dt_for_gpio(&pdev->dev, tps65910, 150 tps65910_gpio->gpio_chip.ngpio); 151 152 if (!pdata) 153 goto skip_init; 154 155 /* Configure sleep control for gpios if provided */ 156 for (i = 0; i < tps65910_gpio->gpio_chip.ngpio; ++i) { 157 if (!pdata->en_gpio_sleep[i]) 158 continue; 159 160 ret = tps65910_reg_set_bits(tps65910, 161 TPS65910_GPIO0 + i, GPIO_SLEEP_MASK); 162 if (ret < 0) 163 dev_warn(tps65910->dev, 164 "GPIO Sleep setting failed with err %d\n", ret); 165 } 166 167 skip_init: 168 ret = devm_gpiochip_add_data(&pdev->dev, &tps65910_gpio->gpio_chip, 169 tps65910_gpio); 170 if (ret < 0) { 171 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 172 return ret; 173 } 174 175 platform_set_drvdata(pdev, tps65910_gpio); 176 177 return ret; 178 } 179 180 static struct platform_driver tps65910_gpio_driver = { 181 .driver.name = "tps65910-gpio", 182 .probe = tps65910_gpio_probe, 183 }; 184 185 static int __init tps65910_gpio_init(void) 186 { 187 return platform_driver_register(&tps65910_gpio_driver); 188 } 189 subsys_initcall(tps65910_gpio_init); 190