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 inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip) 55 { 56 return container_of(chip, struct da9052_gpio, gp); 57 } 58 59 static unsigned char da9052_gpio_port_odd(unsigned offset) 60 { 61 return offset % 2; 62 } 63 64 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset) 65 { 66 struct da9052_gpio *gpio = to_da9052_gpio(gc); 67 int da9052_port_direction = 0; 68 int ret; 69 70 ret = da9052_reg_read(gpio->da9052, 71 DA9052_GPIO_0_1_REG + (offset >> 1)); 72 if (ret < 0) 73 return ret; 74 75 if (da9052_gpio_port_odd(offset)) { 76 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN; 77 da9052_port_direction >>= 4; 78 } else { 79 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN; 80 } 81 82 switch (da9052_port_direction) { 83 case DA9052_INPUT: 84 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER) 85 ret = da9052_reg_read(gpio->da9052, 86 DA9052_STATUS_C_REG); 87 else 88 ret = da9052_reg_read(gpio->da9052, 89 DA9052_STATUS_D_REG); 90 if (ret < 0) 91 return ret; 92 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset))); 93 case DA9052_OUTPUT_PUSHPULL: 94 if (da9052_gpio_port_odd(offset)) 95 return !!(ret & DA9052_GPIO_ODD_PORT_MODE); 96 else 97 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE); 98 default: 99 return -EINVAL; 100 } 101 } 102 103 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value) 104 { 105 struct da9052_gpio *gpio = to_da9052_gpio(gc); 106 int ret; 107 108 if (da9052_gpio_port_odd(offset)) { 109 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 110 DA9052_GPIO_0_1_REG, 111 DA9052_GPIO_ODD_PORT_MODE, 112 value << DA9052_GPIO_ODD_SHIFT); 113 if (ret != 0) 114 dev_err(gpio->da9052->dev, 115 "Failed to updated gpio odd reg,%d", 116 ret); 117 } else { 118 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 119 DA9052_GPIO_0_1_REG, 120 DA9052_GPIO_EVEN_PORT_MODE, 121 value << DA9052_GPIO_EVEN_SHIFT); 122 if (ret != 0) 123 dev_err(gpio->da9052->dev, 124 "Failed to updated gpio even reg,%d", 125 ret); 126 } 127 } 128 129 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset) 130 { 131 struct da9052_gpio *gpio = to_da9052_gpio(gc); 132 unsigned char register_value; 133 int ret; 134 135 /* Format: function - 2 bits type - 1 bit mode - 1 bit */ 136 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 | 137 DA9052_DEBOUNCING_ON << 3; 138 139 if (da9052_gpio_port_odd(offset)) 140 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 141 DA9052_GPIO_0_1_REG, 142 DA9052_GPIO_MASK_UPPER_NIBBLE, 143 (register_value << 144 DA9052_GPIO_NIBBLE_SHIFT)); 145 else 146 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 147 DA9052_GPIO_0_1_REG, 148 DA9052_GPIO_MASK_LOWER_NIBBLE, 149 register_value); 150 151 return ret; 152 } 153 154 static int da9052_gpio_direction_output(struct gpio_chip *gc, 155 unsigned offset, int value) 156 { 157 struct da9052_gpio *gpio = to_da9052_gpio(gc); 158 unsigned char register_value; 159 int ret; 160 161 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */ 162 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 | 163 value << 3; 164 165 if (da9052_gpio_port_odd(offset)) 166 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 167 DA9052_GPIO_0_1_REG, 168 DA9052_GPIO_MASK_UPPER_NIBBLE, 169 (register_value << 170 DA9052_GPIO_NIBBLE_SHIFT)); 171 else 172 ret = da9052_reg_update(gpio->da9052, (offset >> 1) + 173 DA9052_GPIO_0_1_REG, 174 DA9052_GPIO_MASK_LOWER_NIBBLE, 175 register_value); 176 177 return ret; 178 } 179 180 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset) 181 { 182 struct da9052_gpio *gpio = to_da9052_gpio(gc); 183 struct da9052 *da9052 = gpio->da9052; 184 185 int irq; 186 187 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset); 188 189 return irq; 190 } 191 192 static struct gpio_chip reference_gp = { 193 .label = "da9052-gpio", 194 .owner = THIS_MODULE, 195 .get = da9052_gpio_get, 196 .set = da9052_gpio_set, 197 .direction_input = da9052_gpio_direction_input, 198 .direction_output = da9052_gpio_direction_output, 199 .to_irq = da9052_gpio_to_irq, 200 .can_sleep = true, 201 .ngpio = 16, 202 .base = -1, 203 }; 204 205 static int da9052_gpio_probe(struct platform_device *pdev) 206 { 207 struct da9052_gpio *gpio; 208 struct da9052_pdata *pdata; 209 int ret; 210 211 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 212 if (!gpio) 213 return -ENOMEM; 214 215 gpio->da9052 = dev_get_drvdata(pdev->dev.parent); 216 pdata = dev_get_platdata(gpio->da9052->dev); 217 218 gpio->gp = reference_gp; 219 if (pdata && pdata->gpio_base) 220 gpio->gp.base = pdata->gpio_base; 221 222 ret = gpiochip_add(&gpio->gp); 223 if (ret < 0) { 224 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 225 return ret; 226 } 227 228 platform_set_drvdata(pdev, gpio); 229 230 return 0; 231 } 232 233 static int da9052_gpio_remove(struct platform_device *pdev) 234 { 235 struct da9052_gpio *gpio = platform_get_drvdata(pdev); 236 237 gpiochip_remove(&gpio->gp); 238 return 0; 239 } 240 241 static struct platform_driver da9052_gpio_driver = { 242 .probe = da9052_gpio_probe, 243 .remove = da9052_gpio_remove, 244 .driver = { 245 .name = "da9052-gpio", 246 }, 247 }; 248 249 module_platform_driver(da9052_gpio_driver); 250 251 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 252 MODULE_DESCRIPTION("DA9052 GPIO Device Driver"); 253 MODULE_LICENSE("GPL"); 254 MODULE_ALIAS("platform:da9052-gpio"); 255