drivers/gpio/gpio-tps65218.c

   1 /*
   2  * Copyright 2015 Verifone Int.
   3  *
   4  * Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify i t
   7  * under  the terms of the GNU General  Public License as published by th e
   8  * Free Software Foundation;  either version 2 of the License, or (at you r
   9  * option) any later version.
  10  *
  11  * This driver is based on the gpio-tps65912 implementation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/module.h>
  16 #include <linux/errno.h>
  17 #include <linux/gpio/driver.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/regmap.h>
  20 #include <linux/mfd/tps65218.h>
  21
  22 struct tps65218_gpio {
  23         struct tps65218 *tps65218;
  24         struct gpio_chip gpio_chip;
  25 };
  26
  27 static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
  28 {
  29         struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
  30         struct tps65218 *tps65218 = tps65218_gpio->tps65218;
  31         unsigned int val;
  32         int ret;
  33
  34         ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val);
  35         if (ret)
  36                 return ret;
  37
  38         return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
  39 }
  40
  41 static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
  42                               int value)
  43 {
  44         struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
  45         struct tps65218 *tps65218 = tps65218_gpio->tps65218;
  46
  47         if (value)
  48                 tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
  49                                   TPS65218_ENABLE2_GPIO1 << offset,
  50                                   TPS65218_ENABLE2_GPIO1 << offset,
  51                                   TPS65218_PROTECT_L1);
  52         else
  53                 tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
  54                                     TPS65218_ENABLE2_GPIO1 << offset,
  55                                     TPS65218_PROTECT_L1);
  56 }
  57
  58 static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
  59                                 int value)
  60 {
  61         /* Only drives GPOs */
  62         tps65218_gpio_set(gc, offset, value);
  63         return 0;
  64 }
  65
  66 static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
  67 {
  68         return -EPERM;
  69 }
  70
  71 static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
  72 {
  73         struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
  74         struct tps65218 *tps65218 = tps65218_gpio->tps65218;
  75         int ret;
  76
  77         if (gpiochip_line_is_open_source(gc, offset)) {
  78                 dev_err(gc->parent, "can't work as open source\n");
  79                 return -EINVAL;
  80         }
  81
  82         switch (offset) {
  83         case 0:
  84                 if (!gpiochip_line_is_open_drain(gc, offset)) {
  85                         dev_err(gc->parent, "GPO1 works only as open drain\n");
  86                         return -EINVAL;
  87                 }
  88
  89                 /* Disable sequencer for GPO1 */
  90                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
  91                                           TPS65218_SEQ7_GPO1_SEQ_MASK,
  92                                           TPS65218_PROTECT_L1);
  93                 if (ret)
  94                         return ret;
  95
  96                 /* Setup GPO1 */
  97                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
  98                                           TPS65218_CONFIG1_IO1_SEL,
  99                                           TPS65218_PROTECT_L1);
 100                 if (ret)
 101                         return ret;
 102
 103                 break;
 104         case 1:
 105                 /* Setup GPO2 */
 106                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
 107                                           TPS65218_CONFIG1_IO1_SEL,
 108                                           TPS65218_PROTECT_L1);
 109                 if (ret)
 110                         return ret;
 111
 112                 break;
 113
 114         case 2:
 115                 if (!gpiochip_line_is_open_drain(gc, offset)) {
 116                         dev_err(gc->parent, "GPO3 works only as open drain\n");
 117                         return -EINVAL;
 118                 }
 119
 120                 /* Disable sequencer for GPO3 */
 121                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
 122                                           TPS65218_SEQ7_GPO3_SEQ_MASK,
 123                                           TPS65218_PROTECT_L1);
 124                 if (ret)
 125                         return ret;
 126
 127                 /* Setup GPO3 */
 128                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
 129                                           TPS65218_CONFIG2_DC12_RST,
 130                                           TPS65218_PROTECT_L1);
 131                 if (ret)
 132                         return ret;
 133
 134                 break;
 135         default:
 136                 return -EINVAL;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static int tps65218_gpio_set_config(struct gpio_chip *gc, unsigned offset,
 143                                     unsigned long config)
 144 {
 145         struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
 146         struct tps65218 *tps65218 = tps65218_gpio->tps65218;
 147         enum pin_config_param param = pinconf_to_config_param(config);
 148
 149         switch (offset) {
 150         case 0:
 151         case 2:
 152                 /* GPO1 is hardwired to be open drain */
 153                 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
 154                         return 0;
 155                 return -ENOTSUPP;
 156         case 1:
 157                 /* GPO2 is push-pull by default, can be set as open drain. */
 158                 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
 159                         return tps65218_clear_bits(tps65218,
 160                                                    TPS65218_REG_CONFIG1,
 161                                                    TPS65218_CONFIG1_GPO2_BUF,
 162                                                    TPS65218_PROTECT_L1);
 163                 if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
 164                         return tps65218_set_bits(tps65218,
 165                                                  TPS65218_REG_CONFIG1,
 166                                                  TPS65218_CONFIG1_GPO2_BUF,
 167                                                  TPS65218_CONFIG1_GPO2_BUF,
 168                                                  TPS65218_PROTECT_L1);
 169                 return -ENOTSUPP;
 170         default:
 171                 break;
 172         }
 173         return -ENOTSUPP;
 174 }
 175
 176 static const struct gpio_chip template_chip = {
 177         .label                  = "gpio-tps65218",
 178         .owner                  = THIS_MODULE,
 179         .request                = tps65218_gpio_request,
 180         .direction_output       = tps65218_gpio_output,
 181         .direction_input        = tps65218_gpio_input,
 182         .get                    = tps65218_gpio_get,
 183         .set                    = tps65218_gpio_set,
 184         .set_config             = tps65218_gpio_set_config,
 185         .can_sleep              = true,
 186         .ngpio                  = 3,
 187         .base                   = -1,
 188 };
 189
 190 static int tps65218_gpio_probe(struct platform_device *pdev)
 191 {
 192         struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
 193         struct tps65218_gpio *tps65218_gpio;
 194         int ret;
 195
 196         tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
 197                                      GFP_KERNEL);
 198         if (!tps65218_gpio)
 199                 return -ENOMEM;
 200
 201         tps65218_gpio->tps65218 = tps65218;
 202         tps65218_gpio->gpio_chip = template_chip;
 203         tps65218_gpio->gpio_chip.parent = &pdev->dev;
 204 #ifdef CONFIG_OF_GPIO
 205         tps65218_gpio->gpio_chip.of_node = pdev->dev.of_node;
 206 #endif
 207
 208         ret = devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip,
 209                                      tps65218_gpio);
 210         if (ret < 0) {
 211                 dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
 212                 return ret;
 213         }
 214
 215         platform_set_drvdata(pdev, tps65218_gpio);
 216
 217         return ret;
 218 }
 219
 220 static const struct of_device_id tps65218_dt_match[] = {
 221         { .compatible = "ti,tps65218-gpio" },
 222         {  }
 223 };
 224 MODULE_DEVICE_TABLE(of, tps65218_dt_match);
 225
 226 static const struct platform_device_id tps65218_gpio_id_table[] = {
 227         { "tps65218-gpio", },
 228         { /* sentinel */ }
 229 };
 230 MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table);
 231
 232 static struct platform_driver tps65218_gpio_driver = {
 233         .driver = {
 234                 .name = "tps65218-gpio",
 235                 .of_match_table = of_match_ptr(tps65218_dt_match)
 236         },
 237         .probe = tps65218_gpio_probe,
 238         .id_table = tps65218_gpio_id_table,
 239 };
 240
 241 module_platform_driver(tps65218_gpio_driver);
 242
 243 MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
 244 MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
 245 MODULE_LICENSE("GPL v2");
 246 MODULE_ALIAS("platform:tps65218-gpio");