drivers/gpio/gpio-lp87565.c

   1 /*
   2  * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
   3  *      Keerthy <j-keerthy@ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  10  * kind, whether expressed or implied; without even the implied warranty
  11  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License version 2 for more details.
  13  *
  14  * Based on the LP873X driver
  15  */
  16
  17 #include <linux/gpio/driver.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regmap.h>
  21
  22 #include <linux/mfd/lp87565.h>
  23
  24 struct lp87565_gpio {
  25         struct gpio_chip chip;
  26         struct regmap *map;
  27 };
  28
  29 static int lp87565_gpio_get_direction(struct gpio_chip *chip,
  30                                       unsigned int offset)
  31 {
  32         struct lp87565_gpio *gpio = gpiochip_get_data(chip);
  33         int ret, val;
  34
  35         ret = regmap_read(gpio->map, LP87565_REG_GPIO_CONFIG, &val);
  36         if (ret < 0)
  37                 return ret;
  38
  39         return !(val & BIT(offset));
  40 }
  41
  42 static int lp87565_gpio_direction_input(struct gpio_chip *chip,
  43                                         unsigned int offset)
  44 {
  45         struct lp87565_gpio *gpio = gpiochip_get_data(chip);
  46
  47         return regmap_update_bits(gpio->map,
  48                                   LP87565_REG_GPIO_CONFIG,
  49                                   BIT(offset), 0);
  50 }
  51
  52 static int lp87565_gpio_direction_output(struct gpio_chip *chip,
  53                                          unsigned int offset, int value)
  54 {
  55         struct lp87565_gpio *gpio = gpiochip_get_data(chip);
  56
  57         return regmap_update_bits(gpio->map,
  58                                   LP87565_REG_GPIO_CONFIG,
  59                                   BIT(offset), !value ? BIT(offset) : 0);
  60 }
  61
  62 static int lp87565_gpio_get(struct gpio_chip *chip, unsigned int offset)
  63 {
  64         struct lp87565_gpio *gpio = gpiochip_get_data(chip);
  65         int ret, val;
  66
  67         ret = regmap_read(gpio->map, LP87565_REG_GPIO_IN, &val);
  68         if (ret < 0)
  69                 return ret;
  70
  71         return !!(val & BIT(offset));
  72 }
  73
  74 static void lp87565_gpio_set(struct gpio_chip *chip, unsigned int offset,
  75                              int value)
  76 {
  77         struct lp87565_gpio *gpio = gpiochip_get_data(chip);
  78
  79         regmap_update_bits(gpio->map, LP87565_REG_GPIO_OUT,
  80                            BIT(offset), value ? BIT(offset) : 0);
  81 }
  82
  83 static int lp87565_gpio_request(struct gpio_chip *gc, unsigned int offset)
  84 {
  85         struct lp87565_gpio *gpio = gpiochip_get_data(gc);
  86         int ret;
  87
  88         switch (offset) {
  89         case 0:
  90         case 1:
  91         case 2:
  92                 /*
  93                  * MUX can program the pin to be in EN1/2/3 pin mode
  94                  * Or GPIO1/2/3 mode.
  95                  * Setup the GPIO*_SEL MUX to GPIO mode
  96                  */
  97                 ret = regmap_update_bits(gpio->map,
  98                                          LP87565_REG_PIN_FUNCTION,
  99                                          BIT(offset), BIT(offset));
 100                 if (ret)
 101                         return ret;
 102
 103                 break;
 104         default:
 105                 return -EINVAL;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int lp87565_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
 112                                    unsigned long config)
 113 {
 114         struct lp87565_gpio *gpio = gpiochip_get_data(gc);
 115
 116         switch (pinconf_to_config_param(config)) {
 117         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 118                 return regmap_update_bits(gpio->map,
 119                                           LP87565_REG_GPIO_CONFIG,
 120                                           BIT(offset +
 121                                               __ffs(LP87565_GOIO1_OD)),
 122                                           BIT(offset +
 123                                               __ffs(LP87565_GOIO1_OD)));
 124         case PIN_CONFIG_DRIVE_PUSH_PULL:
 125                 return regmap_update_bits(gpio->map,
 126                                           LP87565_REG_GPIO_CONFIG,
 127                                           BIT(offset +
 128                                               __ffs(LP87565_GOIO1_OD)), 0);
 129         default:
 130                 return -ENOTSUPP;
 131         }
 132 }
 133
 134 static const struct gpio_chip template_chip = {
 135         .label                  = "lp87565-gpio",
 136         .owner                  = THIS_MODULE,
 137         .request                = lp87565_gpio_request,
 138         .get_direction          = lp87565_gpio_get_direction,
 139         .direction_input        = lp87565_gpio_direction_input,
 140         .direction_output       = lp87565_gpio_direction_output,
 141         .get                    = lp87565_gpio_get,
 142         .set                    = lp87565_gpio_set,
 143         .set_config             = lp87565_gpio_set_config,
 144         .base                   = -1,
 145         .ngpio                  = 3,
 146         .can_sleep              = true,
 147 };
 148
 149 static int lp87565_gpio_probe(struct platform_device *pdev)
 150 {
 151         struct lp87565_gpio *gpio;
 152         struct lp87565 *lp87565;
 153         int ret;
 154
 155         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 156         if (!gpio)
 157                 return -ENOMEM;
 158
 159         lp87565 = dev_get_drvdata(pdev->dev.parent);
 160         gpio->chip = template_chip;
 161         gpio->chip.parent = lp87565->dev;
 162         gpio->map = lp87565->regmap;
 163
 164         ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
 165         if (ret < 0) {
 166                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 167                 return ret;
 168         }
 169
 170         return 0;
 171 }
 172
 173 static const struct platform_device_id lp87565_gpio_id_table[] = {
 174         { "lp87565-q1-gpio", },
 175         { /* sentinel */ }
 176 };
 177 MODULE_DEVICE_TABLE(platform, lp87565_gpio_id_table);
 178
 179 static struct platform_driver lp87565_gpio_driver = {
 180         .driver = {
 181                 .name = "lp87565-gpio",
 182         },
 183         .probe = lp87565_gpio_probe,
 184         .id_table = lp87565_gpio_id_table,
 185 };
 186 module_platform_driver(lp87565_gpio_driver);
 187
 188 MODULE_AUTHOR("Keerthy <j-keerthy@ti.com>");
 189 MODULE_DESCRIPTION("LP87565 GPIO driver");
 190 MODULE_LICENSE("GPL v2");