1 /* 2 * GPIO Driver for Dialog DA9055 PMICs. 3 * 4 * Copyright(c) 2012 Dialog Semiconductor Ltd. 5 * 6 * Author: David Dajun Chen <dchen@diasemi.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 */ 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/gpio/driver.h> 17 18 #include <linux/mfd/da9055/core.h> 19 #include <linux/mfd/da9055/reg.h> 20 #include <linux/mfd/da9055/pdata.h> 21 22 #define DA9055_VDD_IO 0x0 23 #define DA9055_PUSH_PULL 0x3 24 #define DA9055_ACT_LOW 0x0 25 #define DA9055_GPI 0x1 26 #define DA9055_PORT_MASK 0x3 27 #define DA9055_PORT_SHIFT(offset) (4 * (offset % 2)) 28 29 #define DA9055_INPUT DA9055_GPI 30 #define DA9055_OUTPUT DA9055_PUSH_PULL 31 #define DA9055_IRQ_GPI0 3 32 33 struct da9055_gpio { 34 struct da9055 *da9055; 35 struct gpio_chip gp; 36 }; 37 38 static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset) 39 { 40 struct da9055_gpio *gpio = gpiochip_get_data(gc); 41 int gpio_direction = 0; 42 int ret; 43 44 /* Get GPIO direction */ 45 ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1); 46 if (ret < 0) 47 return ret; 48 49 gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset); 50 gpio_direction >>= DA9055_PORT_SHIFT(offset); 51 switch (gpio_direction) { 52 case DA9055_INPUT: 53 ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B); 54 if (ret < 0) 55 return ret; 56 break; 57 case DA9055_OUTPUT: 58 ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2); 59 if (ret < 0) 60 return ret; 61 } 62 63 return ret & (1 << offset); 64 65 } 66 67 static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value) 68 { 69 struct da9055_gpio *gpio = gpiochip_get_data(gc); 70 71 da9055_reg_update(gpio->da9055, 72 DA9055_REG_GPIO_MODE0_2, 73 1 << offset, 74 value << offset); 75 } 76 77 static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 78 { 79 struct da9055_gpio *gpio = gpiochip_get_data(gc); 80 unsigned char reg_byte; 81 82 reg_byte = (DA9055_ACT_LOW | DA9055_GPI) 83 << DA9055_PORT_SHIFT(offset); 84 85 return da9055_reg_update(gpio->da9055, (offset >> 1) + 86 DA9055_REG_GPIO0_1, 87 DA9055_PORT_MASK << 88 DA9055_PORT_SHIFT(offset), 89 reg_byte); 90 } 91 92 static int da9055_gpio_direction_output(struct gpio_chip *gc, 93 unsigned offset, int value) 94 { 95 struct da9055_gpio *gpio = gpiochip_get_data(gc); 96 unsigned char reg_byte; 97 int ret; 98 99 reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL) 100 << DA9055_PORT_SHIFT(offset); 101 102 ret = da9055_reg_update(gpio->da9055, (offset >> 1) + 103 DA9055_REG_GPIO0_1, 104 DA9055_PORT_MASK << 105 DA9055_PORT_SHIFT(offset), 106 reg_byte); 107 if (ret < 0) 108 return ret; 109 110 da9055_gpio_set(gc, offset, value); 111 112 return 0; 113 } 114 115 static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset) 116 { 117 struct da9055_gpio *gpio = gpiochip_get_data(gc); 118 struct da9055 *da9055 = gpio->da9055; 119 120 return regmap_irq_get_virq(da9055->irq_data, 121 DA9055_IRQ_GPI0 + offset); 122 } 123 124 static const struct gpio_chip reference_gp = { 125 .label = "da9055-gpio", 126 .owner = THIS_MODULE, 127 .get = da9055_gpio_get, 128 .set = da9055_gpio_set, 129 .direction_input = da9055_gpio_direction_input, 130 .direction_output = da9055_gpio_direction_output, 131 .to_irq = da9055_gpio_to_irq, 132 .can_sleep = true, 133 .ngpio = 3, 134 .base = -1, 135 }; 136 137 static int da9055_gpio_probe(struct platform_device *pdev) 138 { 139 struct da9055_gpio *gpio; 140 struct da9055_pdata *pdata; 141 int ret; 142 143 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 144 if (!gpio) 145 return -ENOMEM; 146 147 gpio->da9055 = dev_get_drvdata(pdev->dev.parent); 148 pdata = dev_get_platdata(gpio->da9055->dev); 149 150 gpio->gp = reference_gp; 151 if (pdata && pdata->gpio_base) 152 gpio->gp.base = pdata->gpio_base; 153 154 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 155 if (ret < 0) { 156 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 157 return ret; 158 } 159 160 platform_set_drvdata(pdev, gpio); 161 162 return 0; 163 } 164 165 static struct platform_driver da9055_gpio_driver = { 166 .probe = da9055_gpio_probe, 167 .driver = { 168 .name = "da9055-gpio", 169 }, 170 }; 171 172 static int __init da9055_gpio_init(void) 173 { 174 return platform_driver_register(&da9055_gpio_driver); 175 } 176 subsys_initcall(da9055_gpio_init); 177 178 static void __exit da9055_gpio_exit(void) 179 { 180 platform_driver_unregister(&da9055_gpio_driver); 181 } 182 module_exit(da9055_gpio_exit); 183 184 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 185 MODULE_DESCRIPTION("DA9055 GPIO Device Driver"); 186 MODULE_LICENSE("GPL"); 187 MODULE_ALIAS("platform:da9055-gpio"); 188