drivers/mfd/wm8350-gpio.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * wm8350-core.c  --  Device access for Wolfson WM8350
   4  *
   5  * Copyright 2007, 2008 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Liam Girdwood
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13
  14 #include <linux/mfd/wm8350/core.h>
  15 #include <linux/mfd/wm8350/gpio.h>
  16 #include <linux/mfd/wm8350/pmic.h>
  17
  18 static int gpio_set_dir(struct wm8350 *wm8350, int gpio, int dir)
  19 {
  20         int ret;
  21
  22         wm8350_reg_unlock(wm8350);
  23         if (dir == WM8350_GPIO_DIR_OUT)
  24                 ret = wm8350_clear_bits(wm8350,
  25                                         WM8350_GPIO_CONFIGURATION_I_O,
  26                                         1 << gpio);
  27         else
  28                 ret = wm8350_set_bits(wm8350,
  29                                       WM8350_GPIO_CONFIGURATION_I_O,
  30                                       1 << gpio);
  31         wm8350_reg_lock(wm8350);
  32         return ret;
  33 }
  34
  35 static int wm8350_gpio_set_debounce(struct wm8350 *wm8350, int gpio, int db)
  36 {
  37         if (db == WM8350_GPIO_DEBOUNCE_ON)
  38                 return wm8350_set_bits(wm8350, WM8350_GPIO_DEBOUNCE,
  39                                        1 << gpio);
  40         else
  41                 return wm8350_clear_bits(wm8350,
  42                                          WM8350_GPIO_DEBOUNCE, 1 << gpio);
  43 }
  44
  45 static int gpio_set_func(struct wm8350 *wm8350, int gpio, int func)
  46 {
  47         u16 reg;
  48
  49         wm8350_reg_unlock(wm8350);
  50         switch (gpio) {
  51         case 0:
  52                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
  53                     & ~WM8350_GP0_FN_MASK;
  54                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
  55                                  reg | ((func & 0xf) << 0));
  56                 break;
  57         case 1:
  58                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
  59                     & ~WM8350_GP1_FN_MASK;
  60                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
  61                                  reg | ((func & 0xf) << 4));
  62                 break;
  63         case 2:
  64                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
  65                     & ~WM8350_GP2_FN_MASK;
  66                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
  67                                  reg | ((func & 0xf) << 8));
  68                 break;
  69         case 3:
  70                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_1)
  71                     & ~WM8350_GP3_FN_MASK;
  72                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_1,
  73                                  reg | ((func & 0xf) << 12));
  74                 break;
  75         case 4:
  76                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
  77                     & ~WM8350_GP4_FN_MASK;
  78                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
  79                                  reg | ((func & 0xf) << 0));
  80                 break;
  81         case 5:
  82                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
  83                     & ~WM8350_GP5_FN_MASK;
  84                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
  85                                  reg | ((func & 0xf) << 4));
  86                 break;
  87         case 6:
  88                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
  89                     & ~WM8350_GP6_FN_MASK;
  90                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
  91                                  reg | ((func & 0xf) << 8));
  92                 break;
  93         case 7:
  94                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_2)
  95                     & ~WM8350_GP7_FN_MASK;
  96                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_2,
  97                                  reg | ((func & 0xf) << 12));
  98                 break;
  99         case 8:
 100                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
 101                     & ~WM8350_GP8_FN_MASK;
 102                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
 103                                  reg | ((func & 0xf) << 0));
 104                 break;
 105         case 9:
 106                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
 107                     & ~WM8350_GP9_FN_MASK;
 108                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
 109                                  reg | ((func & 0xf) << 4));
 110                 break;
 111         case 10:
 112                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
 113                     & ~WM8350_GP10_FN_MASK;
 114                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
 115                                  reg | ((func & 0xf) << 8));
 116                 break;
 117         case 11:
 118                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_3)
 119                     & ~WM8350_GP11_FN_MASK;
 120                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_3,
 121                                  reg | ((func & 0xf) << 12));
 122                 break;
 123         case 12:
 124                 reg = wm8350_reg_read(wm8350, WM8350_GPIO_FUNCTION_SELECT_4)
 125                     & ~WM8350_GP12_FN_MASK;
 126                 wm8350_reg_write(wm8350, WM8350_GPIO_FUNCTION_SELECT_4,
 127                                  reg | ((func & 0xf) << 0));
 128                 break;
 129         default:
 130                 wm8350_reg_lock(wm8350);
 131                 return -EINVAL;
 132         }
 133
 134         wm8350_reg_lock(wm8350);
 135         return 0;
 136 }
 137
 138 static int gpio_set_pull_up(struct wm8350 *wm8350, int gpio, int up)
 139 {
 140         if (up)
 141                 return wm8350_set_bits(wm8350,
 142                                        WM8350_GPIO_PIN_PULL_UP_CONTROL,
 143                                        1 << gpio);
 144         else
 145                 return wm8350_clear_bits(wm8350,
 146                                          WM8350_GPIO_PIN_PULL_UP_CONTROL,
 147                                          1 << gpio);
 148 }
 149
 150 static int gpio_set_pull_down(struct wm8350 *wm8350, int gpio, int down)
 151 {
 152         if (down)
 153                 return wm8350_set_bits(wm8350,
 154                                        WM8350_GPIO_PULL_DOWN_CONTROL,
 155                                        1 << gpio);
 156         else
 157                 return wm8350_clear_bits(wm8350,
 158                                          WM8350_GPIO_PULL_DOWN_CONTROL,
 159                                          1 << gpio);
 160 }
 161
 162 static int gpio_set_polarity(struct wm8350 *wm8350, int gpio, int pol)
 163 {
 164         if (pol == WM8350_GPIO_ACTIVE_HIGH)
 165                 return wm8350_set_bits(wm8350,
 166                                        WM8350_GPIO_PIN_POLARITY_TYPE,
 167                                        1 << gpio);
 168         else
 169                 return wm8350_clear_bits(wm8350,
 170                                          WM8350_GPIO_PIN_POLARITY_TYPE,
 171                                          1 << gpio);
 172 }
 173
 174 static int gpio_set_invert(struct wm8350 *wm8350, int gpio, int invert)
 175 {
 176         if (invert == WM8350_GPIO_INVERT_ON)
 177                 return wm8350_set_bits(wm8350, WM8350_GPIO_INT_MODE, 1 << gpio);
 178         else
 179                 return wm8350_clear_bits(wm8350,
 180                                          WM8350_GPIO_INT_MODE, 1 << gpio);
 181 }
 182
 183 int wm8350_gpio_config(struct wm8350 *wm8350, int gpio, int dir, int func,
 184                        int pol, int pull, int invert, int debounce)
 185 {
 186         /* make sure we never pull up and down at the same time */
 187         if (pull == WM8350_GPIO_PULL_NONE) {
 188                 if (gpio_set_pull_up(wm8350, gpio, 0))
 189                         goto err;
 190                 if (gpio_set_pull_down(wm8350, gpio, 0))
 191                         goto err;
 192         } else if (pull == WM8350_GPIO_PULL_UP) {
 193                 if (gpio_set_pull_down(wm8350, gpio, 0))
 194                         goto err;
 195                 if (gpio_set_pull_up(wm8350, gpio, 1))
 196                         goto err;
 197         } else if (pull == WM8350_GPIO_PULL_DOWN) {
 198                 if (gpio_set_pull_up(wm8350, gpio, 0))
 199                         goto err;
 200                 if (gpio_set_pull_down(wm8350, gpio, 1))
 201                         goto err;
 202         }
 203
 204         if (gpio_set_invert(wm8350, gpio, invert))
 205                 goto err;
 206         if (gpio_set_polarity(wm8350, gpio, pol))
 207                 goto err;
 208         if (wm8350_gpio_set_debounce(wm8350, gpio, debounce))
 209                 goto err;
 210         if (gpio_set_dir(wm8350, gpio, dir))
 211                 goto err;
 212         return gpio_set_func(wm8350, gpio, func);
 213
 214 err:
 215         return -EIO;
 216 }
 217 EXPORT_SYMBOL_GPL(wm8350_gpio_config);