drivers/gpio/gpio-tps65218.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2015 Verifone Int.
   4  *
   5  * Author: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
   6  *
   7  * This driver is based on the gpio-tps65912 implementation.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/errno.h>
  13 #include <linux/gpio/driver.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regmap.h>
  16 #include <linux/mfd/tps65218.h>
  17
  18 struct tps65218_gpio {
  19         struct tps65218 *tps65218;
  20         struct gpio_chip gpio_chip;
  21 };
  22
  23 static int tps65218_gpio_get(struct gpio_chip *gc, unsigned offset)
  24 {
  25         struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
  26         struct tps65218 *tps65218 = tps65218_gpio->tps65218;
  27         unsigned int val;
  28         int ret;
  29
  30         ret = regmap_read(tps65218->regmap, TPS65218_REG_ENABLE2, &val);
  31         if (ret)
  32                 return ret;
  33
  34         return !!(val & (TPS65218_ENABLE2_GPIO1 << offset));
  35 }
  36
  37 static void tps65218_gpio_set(struct gpio_chip *gc, unsigned offset,
  38                               int value)
  39 {
  40         struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
  41         struct tps65218 *tps65218 = tps65218_gpio->tps65218;
  42
  43         if (value)
  44                 tps65218_set_bits(tps65218, TPS65218_REG_ENABLE2,
  45                                   TPS65218_ENABLE2_GPIO1 << offset,
  46                                   TPS65218_ENABLE2_GPIO1 << offset,
  47                                   TPS65218_PROTECT_L1);
  48         else
  49                 tps65218_clear_bits(tps65218, TPS65218_REG_ENABLE2,
  50                                     TPS65218_ENABLE2_GPIO1 << offset,
  51                                     TPS65218_PROTECT_L1);
  52 }
  53
  54 static int tps65218_gpio_output(struct gpio_chip *gc, unsigned offset,
  55                                 int value)
  56 {
  57         /* Only drives GPOs */
  58         tps65218_gpio_set(gc, offset, value);
  59         return 0;
  60 }
  61
  62 static int tps65218_gpio_input(struct gpio_chip *gc, unsigned offset)
  63 {
  64         return -EPERM;
  65 }
  66
  67 static int tps65218_gpio_request(struct gpio_chip *gc, unsigned offset)
  68 {
  69         struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
  70         struct tps65218 *tps65218 = tps65218_gpio->tps65218;
  71         int ret;
  72
  73         if (gpiochip_line_is_open_source(gc, offset)) {
  74                 dev_err(gc->parent, "can't work as open source\n");
  75                 return -EINVAL;
  76         }
  77
  78         switch (offset) {
  79         case 0:
  80                 if (!gpiochip_line_is_open_drain(gc, offset)) {
  81                         dev_err(gc->parent, "GPO1 works only as open drain\n");
  82                         return -EINVAL;
  83                 }
  84
  85                 /* Disable sequencer for GPO1 */
  86                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
  87                                           TPS65218_SEQ7_GPO1_SEQ_MASK,
  88                                           TPS65218_PROTECT_L1);
  89                 if (ret)
  90                         return ret;
  91
  92                 /* Setup GPO1 */
  93                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
  94                                           TPS65218_CONFIG1_IO1_SEL,
  95                                           TPS65218_PROTECT_L1);
  96                 if (ret)
  97                         return ret;
  98
  99                 break;
 100         case 1:
 101                 /* Setup GPO2 */
 102                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG1,
 103                                           TPS65218_CONFIG1_IO1_SEL,
 104                                           TPS65218_PROTECT_L1);
 105                 if (ret)
 106                         return ret;
 107
 108                 break;
 109
 110         case 2:
 111                 if (!gpiochip_line_is_open_drain(gc, offset)) {
 112                         dev_err(gc->parent, "GPO3 works only as open drain\n");
 113                         return -EINVAL;
 114                 }
 115
 116                 /* Disable sequencer for GPO3 */
 117                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_SEQ7,
 118                                           TPS65218_SEQ7_GPO3_SEQ_MASK,
 119                                           TPS65218_PROTECT_L1);
 120                 if (ret)
 121                         return ret;
 122
 123                 /* Setup GPO3 */
 124                 ret = tps65218_clear_bits(tps65218, TPS65218_REG_CONFIG2,
 125                                           TPS65218_CONFIG2_DC12_RST,
 126                                           TPS65218_PROTECT_L1);
 127                 if (ret)
 128                         return ret;
 129
 130                 break;
 131         default:
 132                 return -EINVAL;
 133         }
 134
 135         return 0;
 136 }
 137
 138 static int tps65218_gpio_set_config(struct gpio_chip *gc, unsigned offset,
 139                                     unsigned long config)
 140 {
 141         struct tps65218_gpio *tps65218_gpio = gpiochip_get_data(gc);
 142         struct tps65218 *tps65218 = tps65218_gpio->tps65218;
 143         enum pin_config_param param = pinconf_to_config_param(config);
 144
 145         switch (offset) {
 146         case 0:
 147         case 2:
 148                 /* GPO1 is hardwired to be open drain */
 149                 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
 150                         return 0;
 151                 return -ENOTSUPP;
 152         case 1:
 153                 /* GPO2 is push-pull by default, can be set as open drain. */
 154                 if (param == PIN_CONFIG_DRIVE_OPEN_DRAIN)
 155                         return tps65218_clear_bits(tps65218,
 156                                                    TPS65218_REG_CONFIG1,
 157                                                    TPS65218_CONFIG1_GPO2_BUF,
 158                                                    TPS65218_PROTECT_L1);
 159                 if (param == PIN_CONFIG_DRIVE_PUSH_PULL)
 160                         return tps65218_set_bits(tps65218,
 161                                                  TPS65218_REG_CONFIG1,
 162                                                  TPS65218_CONFIG1_GPO2_BUF,
 163                                                  TPS65218_CONFIG1_GPO2_BUF,
 164                                                  TPS65218_PROTECT_L1);
 165                 return -ENOTSUPP;
 166         default:
 167                 break;
 168         }
 169         return -ENOTSUPP;
 170 }
 171
 172 static const struct gpio_chip template_chip = {
 173         .label                  = "gpio-tps65218",
 174         .owner                  = THIS_MODULE,
 175         .request                = tps65218_gpio_request,
 176         .direction_output       = tps65218_gpio_output,
 177         .direction_input        = tps65218_gpio_input,
 178         .get                    = tps65218_gpio_get,
 179         .set                    = tps65218_gpio_set,
 180         .set_config             = tps65218_gpio_set_config,
 181         .can_sleep              = true,
 182         .ngpio                  = 3,
 183         .base                   = -1,
 184 };
 185
 186 static int tps65218_gpio_probe(struct platform_device *pdev)
 187 {
 188         struct tps65218 *tps65218 = dev_get_drvdata(pdev->dev.parent);
 189         struct tps65218_gpio *tps65218_gpio;
 190
 191         tps65218_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65218_gpio),
 192                                      GFP_KERNEL);
 193         if (!tps65218_gpio)
 194                 return -ENOMEM;
 195
 196         tps65218_gpio->tps65218 = tps65218;
 197         tps65218_gpio->gpio_chip = template_chip;
 198         tps65218_gpio->gpio_chip.parent = &pdev->dev;
 199
 200         return devm_gpiochip_add_data(&pdev->dev, &tps65218_gpio->gpio_chip,
 201                                       tps65218_gpio);
 202 }
 203
 204 static const struct of_device_id tps65218_dt_match[] = {
 205         { .compatible = "ti,tps65218-gpio" },
 206         {  }
 207 };
 208 MODULE_DEVICE_TABLE(of, tps65218_dt_match);
 209
 210 static const struct platform_device_id tps65218_gpio_id_table[] = {
 211         { "tps65218-gpio", },
 212         { /* sentinel */ }
 213 };
 214 MODULE_DEVICE_TABLE(platform, tps65218_gpio_id_table);
 215
 216 static struct platform_driver tps65218_gpio_driver = {
 217         .driver = {
 218                 .name = "tps65218-gpio",
 219                 .of_match_table = of_match_ptr(tps65218_dt_match)
 220         },
 221         .probe = tps65218_gpio_probe,
 222         .id_table = tps65218_gpio_id_table,
 223 };
 224
 225 module_platform_driver(tps65218_gpio_driver);
 226
 227 MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>");
 228 MODULE_DESCRIPTION("GPO interface for TPS65218 PMICs");
 229 MODULE_LICENSE("GPL v2");