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
  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                 if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
  93                         return 1;
  94                 else
  95                         return 0;
  96         case DA9052_OUTPUT_PUSHPULL:
  97                 if (da9052_gpio_port_odd(offset))
  98                         return ret & DA9052_GPIO_ODD_PORT_MODE;
  99                 else
 100                         return ret & DA9052_GPIO_EVEN_PORT_MODE;
 101         default:
 102                 return -EINVAL;
 103         }
 104 }
 105
 106 static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 107 {
 108         struct da9052_gpio *gpio = to_da9052_gpio(gc);
 109         int ret;
 110
 111         if (da9052_gpio_port_odd(offset)) {
 112                         ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 113                                                 DA9052_GPIO_0_1_REG,
 114                                                 DA9052_GPIO_ODD_PORT_MODE,
 115                                                 value << DA9052_GPIO_ODD_SHIFT);
 116                         if (ret != 0)
 117                                 dev_err(gpio->da9052->dev,
 118                                         "Failed to updated gpio odd reg,%d",
 119                                         ret);
 120         } else {
 121                         ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 122                                                 DA9052_GPIO_0_1_REG,
 123                                                 DA9052_GPIO_EVEN_PORT_MODE,
 124                                                 value << DA9052_GPIO_EVEN_SHIFT);
 125                         if (ret != 0)
 126                                 dev_err(gpio->da9052->dev,
 127                                         "Failed to updated gpio even reg,%d",
 128                                         ret);
 129         }
 130 }
 131
 132 static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 133 {
 134         struct da9052_gpio *gpio = to_da9052_gpio(gc);
 135         unsigned char register_value;
 136         int ret;
 137
 138         /* Format: function - 2 bits type - 1 bit mode - 1 bit */
 139         register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
 140                          DA9052_DEBOUNCING_ON << 3;
 141
 142         if (da9052_gpio_port_odd(offset))
 143                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 144                                         DA9052_GPIO_0_1_REG,
 145                                         DA9052_GPIO_MASK_UPPER_NIBBLE,
 146                                         (register_value <<
 147                                         DA9052_GPIO_NIBBLE_SHIFT));
 148         else
 149                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 150                                         DA9052_GPIO_0_1_REG,
 151                                         DA9052_GPIO_MASK_LOWER_NIBBLE,
 152                                         register_value);
 153
 154         return ret;
 155 }
 156
 157 static int da9052_gpio_direction_output(struct gpio_chip *gc,
 158                                         unsigned offset, int value)
 159 {
 160         struct da9052_gpio *gpio = to_da9052_gpio(gc);
 161         unsigned char register_value;
 162         int ret;
 163
 164         /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
 165         register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
 166                          value << 3;
 167
 168         if (da9052_gpio_port_odd(offset))
 169                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 170                                         DA9052_GPIO_0_1_REG,
 171                                         DA9052_GPIO_MASK_UPPER_NIBBLE,
 172                                         (register_value <<
 173                                         DA9052_GPIO_NIBBLE_SHIFT));
 174         else
 175                 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
 176                                         DA9052_GPIO_0_1_REG,
 177                                         DA9052_GPIO_MASK_LOWER_NIBBLE,
 178                                         register_value);
 179
 180         return ret;
 181 }
 182
 183 static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
 184 {
 185         struct da9052_gpio *gpio = to_da9052_gpio(gc);
 186         struct da9052 *da9052 = gpio->da9052;
 187
 188         return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
 189 }
 190
 191 static struct gpio_chip reference_gp __devinitdata = {
 192         .label = "da9052-gpio",
 193         .owner = THIS_MODULE,
 194         .get = da9052_gpio_get,
 195         .set = da9052_gpio_set,
 196         .direction_input = da9052_gpio_direction_input,
 197         .direction_output = da9052_gpio_direction_output,
 198         .to_irq = da9052_gpio_to_irq,
 199         .can_sleep = 1,
 200         .ngpio = 16,
 201         .base = -1,
 202 };
 203
 204 static int __devinit da9052_gpio_probe(struct platform_device *pdev)
 205 {
 206         struct da9052_gpio *gpio;
 207         struct da9052_pdata *pdata;
 208         int ret;
 209
 210         gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
 211         if (gpio == NULL)
 212                 return -ENOMEM;
 213
 214         gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
 215         pdata = gpio->da9052->dev->platform_data;
 216
 217         gpio->gp = reference_gp;
 218         if (pdata && pdata->gpio_base)
 219                 gpio->gp.base = pdata->gpio_base;
 220
 221         ret = gpiochip_add(&gpio->gp);
 222         if (ret < 0) {
 223                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 224                 goto err_mem;
 225         }
 226
 227         platform_set_drvdata(pdev, gpio);
 228
 229         return 0;
 230
 231 err_mem:
 232         kfree(gpio);
 233         return ret;
 234 }
 235
 236 static int __devexit da9052_gpio_remove(struct platform_device *pdev)
 237 {
 238         struct da9052_gpio *gpio = platform_get_drvdata(pdev);
 239         int ret;
 240
 241         ret = gpiochip_remove(&gpio->gp);
 242         if (ret == 0)
 243                 kfree(gpio);
 244
 245         return ret;
 246 }
 247
 248 static struct platform_driver da9052_gpio_driver = {
 249         .probe = da9052_gpio_probe,
 250         .remove = __devexit_p(da9052_gpio_remove),
 251         .driver = {
 252                 .name   = "da9052-gpio",
 253                 .owner  = THIS_MODULE,
 254         },
 255 };
 256
 257 static int __init da9052_gpio_init(void)
 258 {
 259         return platform_driver_register(&da9052_gpio_driver);
 260 }
 261 module_init(da9052_gpio_init);
 262
 263 static void __exit da9052_gpio_exit(void)
 264 {
 265         return platform_driver_unregister(&da9052_gpio_driver);
 266 }
 267 module_exit(da9052_gpio_exit);
 268
 269 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
 270 MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
 271 MODULE_LICENSE("GPL");
 272 MODULE_ALIAS("platform:da9052-gpio");