drivers/gpio/gpio-da9052.c

   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 #include <linux/mfd/da9052/gpio.h>
  26
  27 #define DA9052_INPUT                            1
  28 #define DA9052_OUTPUT_OPENDRAIN         2
  29 #define DA9052_OUTPUT_PUSHPULL                  3
  30
  31 #define DA9052_SUPPLY_VDD_IO1                   0
  32
  33 #define DA9052_DEBOUNCING_OFF                   0
  34 #define DA9052_DEBOUNCING_ON                    1
  35
  36 #define DA9052_OUTPUT_LOWLEVEL                  0
  37
  38 #define DA9052_ACTIVE_LOW                       0
  39 #define DA9052_ACTIVE_HIGH                      1
  40
  41 #define DA9052_GPIO_MAX_PORTS_PER_REGISTER      8
  42 #define DA9052_GPIO_SHIFT_COUNT(no)             (no%8)
  43 #define DA9052_GPIO_MASK_UPPER_NIBBLE           0xF0
  44 #define DA9052_GPIO_MASK_LOWER_NIBBLE           0x0F
  45 #define DA9052_GPIO_NIBBLE_SHIFT                4
  46
  47 struct da9052_gpio {
  48         struct da9052 *da9052;
  49         struct gpio_chip gp;
  50 };
  51
  52 static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
  53 {
  54         return container_of(chip, struct da9052_gpio, gp);
  55 }
  56
  57 static unsigned char da9052_gpio_port_odd(unsigned offset)
  58 {
  59         return offset % 2;
  60 }
  61
  62 static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
  63 {
  64         struct da9052_gpio *gpio = to_da9052_gpio(gc);
  65         int da9052_port_direction = 0;
  66         int ret;
  67
  68         ret = da9052_reg_read(gpio->da9052,
  69                               DA9052_GPIO_0_1_REG + (offset >> 1));
  70         if (ret < 0)
  71                 return ret;
  72
  73         if (da9052_gpio_port_odd(offset)) {
  74                 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
  75                 da9052_port_direction >>= 4;
  76         } else {
  77                 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
  78         }
  79
  80         switch (da9052_port_direction) {
  81         case DA9052_INPUT:
  82                 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
  83                         ret = da9052_reg_read(gpio->da9052,
  84                                               DA9052_STATUS_C_REG);
  85                 else
  86                         ret = da9052_reg_read(gpio->da9052,
  87                                               DA9052_STATUS_D_REG);
  88                 if (ret < 0)
  89                         return ret;
  90                 if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
  91                         return 1;
  92                 else
  93                         return 0;
  94         case DA9052_OUTPUT_PUSHPULL:
  95                 if (da9052_gpio_port_odd(offset))
  96                         return ret & DA9052_GPIO_ODD_PORT_MODE;
  97                 else
  98                         return ret & DA9052_GPIO_EVEN_PORT_MODE;
  99         default:
 100                 return -EINVAL;
 101         }
 102 }
 103
 104 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 105 {
 106         struct da9052_gpio *gpio = to_da9052_gpio(gc);
 107         unsigned char register_value = 0;
 108         int ret;
 109
 110         if (da9052_gpio_port_odd(offset)) {
 111                 if (value) {
 112                         register_value = DA9052_GPIO_ODD_PORT_MODE;
 113                         ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 114                                                 DA9052_GPIO_0_1_REG,
 115                                                 DA9052_GPIO_ODD_PORT_MODE,
 116                                                 register_value);
 117                         if (ret != 0)
 118                                 dev_err(gpio->da9052->dev,
 119                                         "Failed to updated gpio odd reg,%d",
 120                                         ret);
 121                 }
 122         } else {
 123                 if (value) {
 124                         register_value = DA9052_GPIO_EVEN_PORT_MODE;
 125                         ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 126                                                 DA9052_GPIO_0_1_REG,
 127                                                 DA9052_GPIO_EVEN_PORT_MODE,
 128                                                 register_value);
 129                         if (ret != 0)
 130                                 dev_err(gpio->da9052->dev,
 131                                         "Failed to updated gpio even reg,%d",
 132                                         ret);
 133                 }
 134         }
 135 }
 136
 137 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 138 {
 139         struct da9052_gpio *gpio = to_da9052_gpio(gc);
 140         unsigned char register_value;
 141         int ret;
 142
 143         /* Format: function - 2 bits type - 1 bit mode - 1 bit */
 144         register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
 145                          DA9052_DEBOUNCING_ON << 3;
 146
 147         if (da9052_gpio_port_odd(offset))
 148                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 149                                         DA9052_GPIO_0_1_REG,
 150                                         DA9052_GPIO_MASK_UPPER_NIBBLE,
 151                                         (register_value <<
 152                                         DA9052_GPIO_NIBBLE_SHIFT));
 153         else
 154                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 155                                         DA9052_GPIO_0_1_REG,
 156                                         DA9052_GPIO_MASK_LOWER_NIBBLE,
 157                                         register_value);
 158
 159         return ret;
 160 }
 161
 162 static int da9052_gpio_direction_output(struct gpio_chip *gc,
 163                                         unsigned offset, int value)
 164 {
 165         struct da9052_gpio *gpio = to_da9052_gpio(gc);
 166         unsigned char register_value;
 167         int ret;
 168
 169         /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
 170         register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
 171                          value << 3;
 172
 173         if (da9052_gpio_port_odd(offset))
 174                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 175                                         DA9052_GPIO_0_1_REG,
 176                                         DA9052_GPIO_MASK_UPPER_NIBBLE,
 177                                         (register_value <<
 178                                         DA9052_GPIO_NIBBLE_SHIFT));
 179         else
 180                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 181                                         DA9052_GPIO_0_1_REG,
 182                                         DA9052_GPIO_MASK_LOWER_NIBBLE,
 183                                         register_value);
 184
 185         return ret;
 186 }
 187
 188 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
 189 {
 190         struct da9052_gpio *gpio = to_da9052_gpio(gc);
 191         struct da9052 *da9052 = gpio->da9052;
 192
 193         return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
 194 }
 195
 196 static struct gpio_chip reference_gp __devinitdata = {
 197         .label = "da9052-gpio",
 198         .owner = THIS_MODULE,
 199         .get = da9052_gpio_get,
 200         .set = da9052_gpio_set,
 201         .direction_input = da9052_gpio_direction_input,
 202         .direction_output = da9052_gpio_direction_output,
 203         .to_irq = da9052_gpio_to_irq,
 204         .can_sleep = 1;
 205         .ngpio = 16;
 206         .base = -1;
 207 };
 208
 209 static int __devinit da9052_gpio_probe(struct platform_device *pdev)
 210 {
 211         struct da9052_gpio *gpio;
 212         struct da9052_pdata *pdata;
 213         int ret;
 214
 215         gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
 216         if (gpio == NULL)
 217                 return -ENOMEM;
 218
 219         gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
 220         pdata = gpio->da9052->dev->platform_data;
 221
 222         gpio->gp = reference_gp;
 223         if (pdata && pdata->gpio_base)
 224                 gpio->gp.base = pdata->gpio_base;
 225
 226         ret = gpiochip_add(&gpio->gp);
 227         if (ret < 0) {
 228                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 229                 goto err_mem;
 230         }
 231
 232         platform_set_drvdata(pdev, gpio);
 233
 234         return 0;
 235
 236 err_mem:
 237         kfree(gpio);
 238         return ret;
 239 }
 240
 241 static int __devexit da9052_gpio_remove(struct platform_device *pdev)
 242 {
 243         struct da9052_gpio *gpio = platform_get_drvdata(pdev);
 244         int ret;
 245
 246         ret = gpiochip_remove(&gpio->gp);
 247         if (ret == 0)
 248                 kfree(gpio);
 249
 250         return ret;
 251 }
 252
 253 static struct platform_driver da9052_gpio_driver = {
 254         .probe = da9052_gpio_probe,
 255         .remove = __devexit_p(da9052_gpio_remove),
 256         .driver = {
 257                 .name   = "da9052-gpio",
 258                 .owner  = THIS_MODULE,
 259         },
 260 };
 261
 262 static int __init da9052_gpio_init(void)
 263 {
 264         return platform_driver_register(&da9052_gpio_driver);
 265 }
 266 module_init(da9052_gpio_init);
 267
 268 static void __exit da9052_gpio_exit(void)
 269 {
 270         return platform_driver_unregister(&da9052_gpio_driver);
 271 }
 272 module_exit(da9052_gpio_exit);
 273
 274 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 275 MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
 276 MODULE_LICENSE("GPL");
 277 MODULE_ALIAS("platform:da9052-gpio");