drivers/mfd/wm8350-gpio.c

   1 /*
   2  * wm8350-core.c  --  Device access for Wolfson WM8350
   3  *
   4  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Liam Girdwood
   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
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/errno.h>
  18
  19 #include <linux/mfd/wm8350/core.h>
  20 #include <linux/mfd/wm8350/gpio.h>
  21 #include <linux/mfd/wm8350/pmic.h>
  22
  23 static int gpio_set_dir(struct wm8350 *wm8350, int gpio, int dir)
  24 {
  25         int ret;
  26
  27         wm8350_reg_unlock(wm8350);
  28         if (dir == WM8350_GPIO_DIR_OUT)
  29                 ret = wm8350_clear_bits(wm8350,
  30                                         WM8350_GPIO_CONFIGURATION_I_O,
  31                                         1 << gpio);
  32         else
  33                 ret = wm8350_set_bits(wm8350,
  34                                       WM8350_GPIO_CONFIGURATION_I_O,
  35                                       1 << gpio);
  36         wm8350_reg_lock(wm8350);
  37         return ret;
  38 }
  39
  40 static int gpio_set_debounce(struct wm8350 *wm8350, int gpio, int db)
  41 {
  42         if (db == WM8350_GPIO_DEBOUNCE_ON)
  43                 return wm8350_set_bits(wm8350, WM8350_GPIO_DEBOUNCE,
  44                                        1 << gpio);
  45         else
  46                 return wm8350_clear_bits(wm8350,
  47                                          WM8350_GPIO_DEBOUNCE, 1 << gpio);
  48 }
  49
  50 static int gpio_set_func(struct wm8350 *wm8350, int gpio, int func)
  51 {
  52         u16 reg;
  53
  54         wm8350_reg_unlock(wm8350);
  55         switch (gpio) {
  56         case 0:
  57                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
  58                     & ~WM8350_GP0_FN_MASK;
  59                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
  60                                  reg | ((func & 0xf) << 0));
  61                 break;
  62         case 1:
  63                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
  64                     & ~WM8350_GP1_FN_MASK;
  65                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
  66                                  reg | ((func & 0xf) << 4));
  67                 break;
  68         case 2:
  69                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
  70                     & ~WM8350_GP2_FN_MASK;
  71                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
  72                                  reg | ((func & 0xf) << 8));
  73                 break;
  74         case 3:
  75                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
  76                     & ~WM8350_GP3_FN_MASK;
  77                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
  78                                  reg | ((func & 0xf) << 12));
  79                 break;
  80         case 4:
  81                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
  82                     & ~WM8350_GP4_FN_MASK;
  83                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
  84                                  reg | ((func & 0xf) << 0));
  85                 break;
  86         case 5:
  87                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
  88                     & ~WM8350_GP5_FN_MASK;
  89                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
  90                                  reg | ((func & 0xf) << 4));
  91                 break;
  92         case 6:
  93                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
  94                     & ~WM8350_GP6_FN_MASK;
  95                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
  96                                  reg | ((func & 0xf) << 8));
  97                 break;
  98         case 7:
  99                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
 100                     & ~WM8350_GP7_FN_MASK;
 101                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
 102                                  reg | ((func & 0xf) << 12));
 103                 break;
 104         case 8:
 105                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
 106                     & ~WM8350_GP8_FN_MASK;
 107                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
 108                                  reg | ((func & 0xf) << 0));
 109                 break;
 110         case 9:
 111                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
 112                     & ~WM8350_GP9_FN_MASK;
 113                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
 114                                  reg | ((func & 0xf) << 4));
 115                 break;
 116         case 10:
 117                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
 118                     & ~WM8350_GP10_FN_MASK;
 119                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
 120                                  reg | ((func & 0xf) << 8));
 121                 break;
 122         case 11:
 123                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
 124                     & ~WM8350_GP11_FN_MASK;
 125                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
 126                                  reg | ((func & 0xf) << 12));
 127                 break;
 128         case 12:
 129                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_4)
 130                     & ~WM8350_GP12_FN_MASK;
 131                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_4,
 132                                  reg | ((func & 0xf) << 0));
 133                 break;
 134         default:
 135                 wm8350_reg_lock(wm8350);
 136                 return -EINVAL;
 137         }
 138
 139         wm8350_reg_lock(wm8350);
 140         return 0;
 141 }
 142
 143 static int gpio_set_pull_up(struct wm8350 *wm8350, int gpio, int up)
 144 {
 145         if (up)
 146                 return wm8350_set_bits(wm8350,
 147                                        WM8350_GPIO_PIN_PULL_UP_CONTROL,
 148                                        1 << gpio);
 149         else
 150                 return wm8350_clear_bits(wm8350,
 151                                          WM8350_GPIO_PIN_PULL_UP_CONTROL,
 152                                          1 << gpio);
 153 }
 154
 155 static int gpio_set_pull_down(struct wm8350 *wm8350, int gpio, int down)
 156 {
 157         if (down)
 158                 return wm8350_set_bits(wm8350,
 159                                        WM8350_GPIO_PULL_DOWN_CONTROL,
 160                                        1 << gpio);
 161         else
 162                 return wm8350_clear_bits(wm8350,
 163                                          WM8350_GPIO_PULL_DOWN_CONTROL,
 164                                          1 << gpio);
 165 }
 166
 167 static int gpio_set_polarity(struct wm8350 *wm8350, int gpio, int pol)
 168 {
 169         if (pol == WM8350_GPIO_ACTIVE_HIGH)
 170                 return wm8350_set_bits(wm8350,
 171                                        WM8350_GPIO_PIN_POLARITY_TYPE,
 172                                        1 << gpio);
 173         else
 174                 return wm8350_clear_bits(wm8350,
 175                                          WM8350_GPIO_PIN_POLARITY_TYPE,
 176                                          1 << gpio);
 177 }
 178
 179 static int gpio_set_invert(struct wm8350 *wm8350, int gpio, int invert)
 180 {
 181         if (invert == WM8350_GPIO_INVERT_ON)
 182                 return wm8350_set_bits(wm8350, WM8350_GPIO_INT_MODE, 1 << gpio);
 183         else
 184                 return wm8350_clear_bits(wm8350,
 185                                          WM8350_GPIO_INT_MODE, 1 << gpio);
 186 }
 187
 188 int wm8350_gpio_config(struct wm8350 *wm8350, int gpio, int dir, int func,
 189                        int pol, int pull, int invert, int debounce)
 190 {
 191         /* make sure we never pull up and down at the same time */
 192         if (pull == WM8350_GPIO_PULL_NONE) {
 193                 if (gpio_set_pull_up(wm8350, gpio, 0))
 194                         goto err;
 195                 if (gpio_set_pull_down(wm8350, gpio, 0))
 196                         goto err;
 197         } else if (pull == WM8350_GPIO_PULL_UP) {
 198                 if (gpio_set_pull_down(wm8350, gpio, 0))
 199                         goto err;
 200                 if (gpio_set_pull_up(wm8350, gpio, 1))
 201                         goto err;
 202         } else if (pull == WM8350_GPIO_PULL_DOWN) {
 203                 if (gpio_set_pull_up(wm8350, gpio, 0))
 204                         goto err;
 205                 if (gpio_set_pull_down(wm8350, gpio, 1))
 206                         goto err;
 207         }
 208
 209         if (gpio_set_invert(wm8350, gpio, invert))
 210                 goto err;
 211         if (gpio_set_polarity(wm8350, gpio, pol))
 212                 goto err;
 213         if (gpio_set_debounce(wm8350, gpio, debounce))
 214                 goto err;
 215         if (gpio_set_dir(wm8350, gpio, dir))
 216                 goto err;
 217         return gpio_set_func(wm8350, gpio, func);
 218
 219 err:
 220         return -EIO;
 221 }
 222 EXPORT_SYMBOL_GPL(wm8350_gpio_config);