1 /* 2 * GPIO Driver for Dialog DA9052 PMICs. 3 * 4 * Copyright(c) 2011 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/fs.h> 16 #include <linux/uaccess.h> 17 #include <linux/platform_device.h> 18 #include <linux/gpio.h> 19 #include <linux/syscalls.h> 20 #include <linux/seq_file.h> 21 22 #include <linux/mfd/da9052/da9052.h> 23 #include <linux/mfd/da9052/reg.h> 24 #include <linux/mfd/da9052/pdata.h> 25 26 #define DA9052_INPUT 1 27 #define DA9052_OUTPUT_OPENDRAIN 2 28 #define DA9052_OUTPUT_PUSHPULL 3 29 30 #define DA9052_SUPPLY_VDD_IO1 0 31 32 #define DA9052_DEBOUNCING_OFF 0 33 #define DA9052_DEBOUNCING_ON 1 34 35 #define DA9052_OUTPUT_LOWLEVEL 0 36 37 #define DA9052_ACTIVE_LOW 0 38 #define DA9052_ACTIVE_HIGH 1 39 40 #define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8 41 #define DA9052_GPIO_SHIFT_COUNT(no) (no%8) 42 #define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0 43 #define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F 44 #define DA9052_GPIO_NIBBLE_SHIFT 4 45 #define DA9052_IRQ_GPI0 16 46 #define DA9052_GPIO_ODD_SHIFT 7 47 #define DA9052_GPIO_EVEN_SHIFT 3 48 49 struct da9052_gpio { 50 struct da9052 *da9052; 51 struct gpio_chip gp; 52 }; 53 54 static unsigned char da9052_gpio_port_odd(unsigned offset) 55 { 56 return offset % 2; 57 } 58 59 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset) 60 { 61 struct da9052_gpio *gpio = gpiochip_get_data(gc); 62 int da9052_port_direction = 0; 63 int ret; 64 65 ret = da9052_reg_read(gpio->da9052, 66 DA9052_GPIO_0_1_REG + (offset >> 1)); 67 if (ret < 0) 68 return ret; 69 70 if (da9052_gpio_port_odd(offset)) { 71 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN; 72 da9052_port_direction >>= 4; 73 } else { 74 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN; 75 } 76 77 switch (da9052_port_direction) { 78 case DA9052_INPUT: 79 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER) 80 ret = da9052_reg_read(gpio->da9052, 81 DA9052_STATUS_C_REG); 82 else 83 ret = da9052_reg_read(gpio->da9052, 84 DA9052_STATUS_D_REG); 85 if (ret < 0) 86 return ret; 87 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset))); 88 case DA9052_OUTPUT_PUSHPULL: 89 if (da9052_gpio_port_odd(offset)) 90 return !!(ret & DA9052_GPIO_ODD_PORT_MODE); 91 else 92 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE); 93 default: 94 return -EINVAL; 95 } 96 } 97 98 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value) 99 { 100 struct da9052_gpio *gpio = gpiochip_get_data(gc); 101 int ret; 102 103 if (da9052_gpio_port_odd(offset)) { 104 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 105 DA9052_GPIO_0_1_REG, 106 DA9052_GPIO_ODD_PORT_MODE, 107 value << DA9052_GPIO_ODD_SHIFT); 108 if (ret != 0) 109 dev_err(gpio->da9052->dev, 110 "Failed to updated gpio odd reg,%d", 111 ret); 112 } else { 113 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 114 DA9052_GPIO_0_1_REG, 115 DA9052_GPIO_EVEN_PORT_MODE, 116 value << DA9052_GPIO_EVEN_SHIFT); 117 if (ret != 0) 118 dev_err(gpio->da9052->dev, 119 "Failed to updated gpio even reg,%d", 120 ret); 121 } 122 } 123 124 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 125 { 126 struct da9052_gpio *gpio = gpiochip_get_data(gc); 127 unsigned char register_value; 128 int ret; 129 130 /* Format: function - 2 bits type - 1 bit mode - 1 bit */ 131 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 | 132 DA9052_DEBOUNCING_ON << 3; 133 134 if (da9052_gpio_port_odd(offset)) 135 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 136 DA9052_GPIO_0_1_REG, 137 DA9052_GPIO_MASK_UPPER_NIBBLE, 138 (register_value << 139 DA9052_GPIO_NIBBLE_SHIFT)); 140 else 141 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 142 DA9052_GPIO_0_1_REG, 143 DA9052_GPIO_MASK_LOWER_NIBBLE, 144 register_value); 145 146 return ret; 147 } 148 149 static int da9052_gpio_direction_output(struct gpio_chip *gc, 150 unsigned offset, int value) 151 { 152 struct da9052_gpio *gpio = gpiochip_get_data(gc); 153 unsigned char register_value; 154 int ret; 155 156 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */ 157 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 | 158 value << 3; 159 160 if (da9052_gpio_port_odd(offset)) 161 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 162 DA9052_GPIO_0_1_REG, 163 DA9052_GPIO_MASK_UPPER_NIBBLE, 164 (register_value << 165 DA9052_GPIO_NIBBLE_SHIFT)); 166 else 167 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 168 DA9052_GPIO_0_1_REG, 169 DA9052_GPIO_MASK_LOWER_NIBBLE, 170 register_value); 171 172 return ret; 173 } 174 175 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset) 176 { 177 struct da9052_gpio *gpio = gpiochip_get_data(gc); 178 struct da9052 *da9052 = gpio->da9052; 179 180 int irq; 181 182 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset); 183 184 return irq; 185 } 186 187 static const struct gpio_chip reference_gp = { 188 .label = "da9052-gpio", 189 .owner = THIS_MODULE, 190 .get = da9052_gpio_get, 191 .set = da9052_gpio_set, 192 .direction_input = da9052_gpio_direction_input, 193 .direction_output = da9052_gpio_direction_output, 194 .to_irq = da9052_gpio_to_irq, 195 .can_sleep = true, 196 .ngpio = 16, 197 .base = -1, 198 }; 199 200 static int da9052_gpio_probe(struct platform_device *pdev) 201 { 202 struct da9052_gpio *gpio; 203 struct da9052_pdata *pdata; 204 int ret; 205 206 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 207 if (!gpio) 208 return -ENOMEM; 209 210 gpio->da9052 = dev_get_drvdata(pdev->dev.parent); 211 pdata = dev_get_platdata(gpio->da9052->dev); 212 213 gpio->gp = reference_gp; 214 if (pdata && pdata->gpio_base) 215 gpio->gp.base = pdata->gpio_base; 216 217 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); 218 if (ret < 0) { 219 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 220 return ret; 221 } 222 223 platform_set_drvdata(pdev, gpio); 224 225 return 0; 226 } 227 228 static struct platform_driver da9052_gpio_driver = { 229 .probe = da9052_gpio_probe, 230 .driver = { 231 .name = "da9052-gpio", 232 }, 233 }; 234 235 module_platform_driver(da9052_gpio_driver); 236 237 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 238 MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); 239 MODULE_LICENSE("GPL"); 240 MODULE_ALIAS("platform:da9052-gpio"); 241