1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * GPIO Driver for Dialog DA9055 PMICs. 4 * 5 * Copyright(c) 2012 Dialog Semiconductor Ltd. 6 * 7 * Author: David Dajun Chen <dchen@diasemi.com> 8 */ 9 #include <linux/module.h> 10 #include <linux/platform_device.h> 11 #include <linux/gpio/driver.h> 12 13 #include <linux/mfd/da9055/core.h> 14 #include <linux/mfd/da9055/reg.h> 15 #include <linux/mfd/da9055/pdata.h> 16 17 #define DA9055_VDD_IO 0x0 18 #define DA9055_PUSH_PULL 0x3 19 #define DA9055_ACT_LOW 0x0 20 #define DA9055_GPI 0x1 21 #define DA9055_PORT_MASK 0x3 22 #define DA9055_PORT_SHIFT(offset) (4 * (offset % 2)) 23 24 #define DA9055_INPUT DA9055_GPI 25 #define DA9055_OUTPUT DA9055_PUSH_PULL 26 #define DA9055_IRQ_GPI0 3 27 28 struct da9055_gpio { 29 struct da9055 *da9055; 30 struct gpio_chip gp; 31 }; 32 33 static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset) 34 { 35 struct da9055_gpio *gpio = gpiochip_get_data(gc); 36 int gpio_direction = 0; 37 int ret; 38 39 /* Get GPIO direction */ 40 ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1); 41 if (ret < 0) 42 return ret; 43 44 gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset); 45 gpio_direction >>= DA9055_PORT_SHIFT(offset); 46 switch (gpio_direction) { 47 case DA9055_INPUT: 48 ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B); 49 if (ret < 0) 50 return ret; 51 break; 52 case DA9055_OUTPUT: 53 ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2); 54 if (ret < 0) 55 return ret; 56 } 57 58 return ret & (1 << offset); 59 60 } 61 62 static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value) 63 { 64 struct da9055_gpio *gpio = gpiochip_get_data(gc); 65 66 da9055_reg_update(gpio->da9055, 67 DA9055_REG_GPIO_MODE0_2, 68 1 << offset, 69 value << offset); 70 } 71 72 static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 73 { 74 struct da9055_gpio *gpio = gpiochip_get_data(gc); 75 unsigned char reg_byte; 76 77 reg_byte = (DA9055_ACT_LOW | DA9055_GPI) 78 << DA9055_PORT_SHIFT(offset); 79 80 return da9055_reg_update(gpio->da9055, (offset >> 1) + 81 DA9055_REG_GPIO0_1, 82 DA9055_PORT_MASK << 83 DA9055_PORT_SHIFT(offset), 84 reg_byte); 85 } 86 87 static int da9055_gpio_direction_output(struct gpio_chip *gc, 88 unsigned offset, int value) 89 { 90 struct da9055_gpio *gpio = gpiochip_get_data(gc); 91 unsigned char reg_byte; 92 int ret; 93 94 reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL) 95 << DA9055_PORT_SHIFT(offset); 96 97 ret = da9055_reg_update(gpio->da9055, (offset >> 1) + 98 DA9055_REG_GPIO0_1, 99 DA9055_PORT_MASK << 100 DA9055_PORT_SHIFT(offset), 101 reg_byte); 102 if (ret < 0) 103 return ret; 104 105 da9055_gpio_set(gc, offset, value); 106 107 return 0; 108 } 109 110 static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset) 111 { 112 struct da9055_gpio *gpio = gpiochip_get_data(gc); 113 struct da9055 *da9055 = gpio->da9055; 114 115 return regmap_irq_get_virq(da9055->irq_data, 116 DA9055_IRQ_GPI0 + offset); 117 } 118 119 static const struct gpio_chip reference_gp = { 120 .label = "da9055-gpio", 121 .owner = THIS_MODULE, 122 .get = da9055_gpio_get, 123 .set = da9055_gpio_set, 124 .direction_input = da9055_gpio_direction_input, 125 .direction_output = da9055_gpio_direction_output, 126 .to_irq = da9055_gpio_to_irq, 127 .can_sleep = true, 128 .ngpio = 3, 129 .base = -1, 130 }; 131 132 static int da9055_gpio_probe(struct platform_device *pdev) 133 { 134 struct da9055_gpio *gpio; 135 struct da9055_pdata *pdata; 136 int ret; 137 138 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 139 if (!gpio) 140 return -ENOMEM; 141 142 gpio->da9055 = dev_get_drvdata(pdev->dev.parent); 143 pdata = dev_get_platdata(gpio->da9055->dev); 144 145 gpio->gp = reference_gp; 146 if (pdata && pdata->gpio_base) 147 gpio->gp.base = pdata->gpio_base; 148 149 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 150 if (ret < 0) { 151 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 152 return ret; 153 } 154 155 platform_set_drvdata(pdev, gpio); 156 157 return 0; 158 } 159 160 static struct platform_driver da9055_gpio_driver = { 161 .probe = da9055_gpio_probe, 162 .driver = { 163 .name = "da9055-gpio", 164 }, 165 }; 166 167 static int __init da9055_gpio_init(void) 168 { 169 return platform_driver_register(&da9055_gpio_driver); 170 } 171 subsys_initcall(da9055_gpio_init); 172 173 static void __exit da9055_gpio_exit(void) 174 { 175 platform_driver_unregister(&da9055_gpio_driver); 176 } 177 module_exit(da9055_gpio_exit); 178 179 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 180 MODULE_DESCRIPTION("DA9055 GPIO Device Driver"); 181 MODULE_LICENSE("GPL"); 182 MODULE_ALIAS("platform:da9055-gpio"); 183