drivers/gpio/gpio-tps65912.c

   1 /*
   2  * GPIO driver for TI TPS65912x PMICs
   3  *
   4  * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
   5  *      Andrew F. Davis <afd@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12  * kind, whether expressed or implied; without even the implied warranty
  13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License version 2 for more details.
  15  *
  16  * Based on the Arizona GPIO driver and the previous TPS65912 driver by
  17  * Margarita Olaya Cabrera <magi@slimlogic.co.uk>
  18  */
  19
  20 #include <linux/gpio.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23
  24 #include <linux/mfd/tps65912.h>
  25
  26 struct tps65912_gpio {
  27         struct gpio_chip gpio_chip;
  28         struct tps65912 *tps;
  29 };
  30
  31 static int tps65912_gpio_get_direction(struct gpio_chip *gc,
  32                                        unsigned offset)
  33 {
  34         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  35
  36         int ret, val;
  37
  38         ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
  39         if (ret)
  40                 return ret;
  41
  42         if (val & GPIO_CFG_MASK)
  43                 return GPIOF_DIR_OUT;
  44         else
  45                 return GPIOF_DIR_IN;
  46 }
  47
  48 static int tps65912_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
  49 {
  50         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  51
  52         return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  53                                   GPIO_CFG_MASK, 0);
  54 }
  55
  56 static int tps65912_gpio_direction_output(struct gpio_chip *gc,
  57                                           unsigned offset, int value)
  58 {
  59         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  60
  61         /* Set the initial value */
  62         regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  63                            GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
  64
  65         return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  66                                   GPIO_CFG_MASK, GPIO_CFG_MASK);
  67 }
  68
  69 static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
  70 {
  71         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  72         int ret, val;
  73
  74         ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
  75         if (ret)
  76                 return ret;
  77
  78         if (val & GPIO_STS_MASK)
  79                 return 1;
  80
  81         return 0;
  82 }
  83
  84 static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
  85                               int value)
  86 {
  87         struct tps65912_gpio *gpio = gpiochip_get_data(gc);
  88
  89         regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
  90                            GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
  91 }
  92
  93 static const struct gpio_chip template_chip = {
  94         .label                  = "tps65912-gpio",
  95         .owner                  = THIS_MODULE,
  96         .get_direction          = tps65912_gpio_get_direction,
  97         .direction_input        = tps65912_gpio_direction_input,
  98         .direction_output       = tps65912_gpio_direction_output,
  99         .get                    = tps65912_gpio_get,
 100         .set                    = tps65912_gpio_set,
 101         .base                   = -1,
 102         .ngpio                  = 5,
 103         .can_sleep              = true,
 104 };
 105
 106 static int tps65912_gpio_probe(struct platform_device *pdev)
 107 {
 108         struct tps65912 *tps = dev_get_drvdata(pdev->dev.parent);
 109         struct tps65912_gpio *gpio;
 110         int ret;
 111
 112         gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
 113         if (!gpio)
 114                 return -ENOMEM;
 115
 116         gpio->tps = dev_get_drvdata(pdev->dev.parent);
 117         gpio->gpio_chip = template_chip;
 118         gpio->gpio_chip.parent = tps->dev;
 119
 120         ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gpio_chip,
 121                                      gpio);
 122         if (ret < 0) {
 123                 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
 124                 return ret;
 125         }
 126
 127         platform_set_drvdata(pdev, gpio);
 128
 129         return 0;
 130 }
 131
 132 static const struct platform_device_id tps65912_gpio_id_table[] = {
 133         { "tps65912-gpio", },
 134         { /* sentinel */ }
 135 };
 136 MODULE_DEVICE_TABLE(platform, tps65912_gpio_id_table);
 137
 138 static struct platform_driver tps65912_gpio_driver = {
 139         .driver = {
 140                 .name = "tps65912-gpio",
 141         },
 142         .probe = tps65912_gpio_probe,
 143         .id_table = tps65912_gpio_id_table,
 144 };
 145 module_platform_driver(tps65912_gpio_driver);
 146
 147 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
 148 MODULE_DESCRIPTION("TPS65912 GPIO driver");
 149 MODULE_LICENSE("GPL v2");