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 int da9055_gpio_set(struct gpio_chip *gc, unsigned int offset, int value) 63 { 64 struct da9055_gpio *gpio = gpiochip_get_data(gc); 65 66 return da9055_reg_update(gpio->da9055, DA9055_REG_GPIO_MODE0_2, 67 1 << offset, value << offset); 68 } 69 70 static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 71 { 72 struct da9055_gpio *gpio = gpiochip_get_data(gc); 73 unsigned char reg_byte; 74 75 reg_byte = (DA9055_ACT_LOW | DA9055_GPI) 76 << DA9055_PORT_SHIFT(offset); 77 78 return da9055_reg_update(gpio->da9055, (offset >> 1) + 79 DA9055_REG_GPIO0_1, 80 DA9055_PORT_MASK << 81 DA9055_PORT_SHIFT(offset), 82 reg_byte); 83 } 84 85 static int da9055_gpio_direction_output(struct gpio_chip *gc, 86 unsigned offset, int value) 87 { 88 struct da9055_gpio *gpio = gpiochip_get_data(gc); 89 unsigned char reg_byte; 90 int ret; 91 92 reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL) 93 << DA9055_PORT_SHIFT(offset); 94 95 ret = da9055_reg_update(gpio->da9055, (offset >> 1) + 96 DA9055_REG_GPIO0_1, 97 DA9055_PORT_MASK << 98 DA9055_PORT_SHIFT(offset), 99 reg_byte); 100 if (ret < 0) 101 return ret; 102 103 return da9055_gpio_set(gc, offset, value); 104 } 105 106 static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset) 107 { 108 struct da9055_gpio *gpio = gpiochip_get_data(gc); 109 struct da9055 *da9055 = gpio->da9055; 110 111 return regmap_irq_get_virq(da9055->irq_data, 112 DA9055_IRQ_GPI0 + offset); 113 } 114 115 static const struct gpio_chip reference_gp = { 116 .label = "da9055-gpio", 117 .owner = THIS_MODULE, 118 .get = da9055_gpio_get, 119 .set_rv = da9055_gpio_set, 120 .direction_input = da9055_gpio_direction_input, 121 .direction_output = da9055_gpio_direction_output, 122 .to_irq = da9055_gpio_to_irq, 123 .can_sleep = true, 124 .ngpio = 3, 125 .base = -1, 126 }; 127 128 static int da9055_gpio_probe(struct platform_device *pdev) 129 { 130 struct da9055_gpio *gpio; 131 struct da9055_pdata *pdata; 132 133 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 134 if (!gpio) 135 return -ENOMEM; 136 137 gpio->da9055 = dev_get_drvdata(pdev->dev.parent); 138 pdata = dev_get_platdata(gpio->da9055->dev); 139 140 gpio->gp = reference_gp; 141 if (pdata && pdata->gpio_base) 142 gpio->gp.base = pdata->gpio_base; 143 144 return devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 145 } 146 147 static struct platform_driver da9055_gpio_driver = { 148 .probe = da9055_gpio_probe, 149 .driver = { 150 .name = "da9055-gpio", 151 }, 152 }; 153 154 static int __init da9055_gpio_init(void) 155 { 156 return platform_driver_register(&da9055_gpio_driver); 157 } 158 subsys_initcall(da9055_gpio_init); 159 160 static void __exit da9055_gpio_exit(void) 161 { 162 platform_driver_unregister(&da9055_gpio_driver); 163 } 164 module_exit(da9055_gpio_exit); 165 166 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 167 MODULE_DESCRIPTION("DA9055 GPIO Device Driver"); 168 MODULE_LICENSE("GPL"); 169 MODULE_ALIAS("platform:da9055-gpio"); 170