Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpio / gpio-arizona.c

diff --git a/kernel/drivers/gpio/gpio-arizona.c b/kernel/drivers/gpio/gpio-arizona.c
new file mode 100644 (file)
index 0000000..052fbc8
--- /dev/null
+++ b/kernel/drivers/gpio/gpio-arizona.c
@@ -0,0 +1,168 @@
+/*
+ * gpiolib support for Wolfson Arizona class devices
+ *
+ * Copyright 2012 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+
+#include <linux/mfd/arizona/core.h>
+#include <linux/mfd/arizona/pdata.h>
+#include <linux/mfd/arizona/registers.h>
+
+struct arizona_gpio {
+       struct arizona *arizona;
+       struct gpio_chip gpio_chip;
+};
+
+static inline struct arizona_gpio *to_arizona_gpio(struct gpio_chip *chip)
+{
+       return container_of(chip, struct arizona_gpio, gpio_chip);
+}
+
+static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
+{
+       struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
+       struct arizona *arizona = arizona_gpio->arizona;
+
+       return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
+                                 ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
+}
+
+static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+       struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
+       struct arizona *arizona = arizona_gpio->arizona;
+       unsigned int val;
+       int ret;
+
+       ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
+       if (ret < 0)
+               return ret;
+
+       if (val & ARIZONA_GPN_LVL)
+               return 1;
+       else
+               return 0;
+}
+
+static int arizona_gpio_direction_out(struct gpio_chip *chip,
+                                    unsigned offset, int value)
+{
+       struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
+       struct arizona *arizona = arizona_gpio->arizona;
+
+       if (value)
+               value = ARIZONA_GPN_LVL;
+
+       return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
+                                 ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
+}
+
+static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+       struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
+       struct arizona *arizona = arizona_gpio->arizona;
+
+       if (value)
+               value = ARIZONA_GPN_LVL;
+
+       regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
+                          ARIZONA_GPN_LVL, value);
+}
+
+static struct gpio_chip template_chip = {
+       .label                  = "arizona",
+       .owner                  = THIS_MODULE,
+       .direction_input        = arizona_gpio_direction_in,
+       .get                    = arizona_gpio_get,
+       .direction_output       = arizona_gpio_direction_out,
+       .set                    = arizona_gpio_set,
+       .can_sleep              = true,
+};
+
+static int arizona_gpio_probe(struct platform_device *pdev)
+{
+       struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
+       struct arizona_pdata *pdata = dev_get_platdata(arizona->dev);
+       struct arizona_gpio *arizona_gpio;
+       int ret;
+
+       arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
+                                   GFP_KERNEL);
+       if (!arizona_gpio)
+               return -ENOMEM;
+
+       arizona_gpio->arizona = arizona;
+       arizona_gpio->gpio_chip = template_chip;
+       arizona_gpio->gpio_chip.dev = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+       arizona_gpio->gpio_chip.of_node = arizona->dev->of_node;
+#endif
+
+       switch (arizona->type) {
+       case WM5102:
+       case WM5110:
+       case WM8280:
+       case WM8997:
+               arizona_gpio->gpio_chip.ngpio = 5;
+               break;
+       default:
+               dev_err(&pdev->dev, "Unknown chip variant %d\n",
+                       arizona->type);
+               return -EINVAL;
+       }
+
+       if (pdata && pdata->gpio_base)
+               arizona_gpio->gpio_chip.base = pdata->gpio_base;
+       else
+               arizona_gpio->gpio_chip.base = -1;
+
+       ret = gpiochip_add(&arizona_gpio->gpio_chip);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
+                       ret);
+               goto err;
+       }
+
+       platform_set_drvdata(pdev, arizona_gpio);
+
+       return ret;
+
+err:
+       return ret;
+}
+
+static int arizona_gpio_remove(struct platform_device *pdev)
+{
+       struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
+
+       gpiochip_remove(&arizona_gpio->gpio_chip);
+       return 0;
+}
+
+static struct platform_driver arizona_gpio_driver = {
+       .driver.name    = "arizona-gpio",
+       .probe          = arizona_gpio_probe,
+       .remove         = arizona_gpio_remove,
+};
+
+module_platform_driver(arizona_gpio_driver);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("GPIO interface for Arizona devices");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:arizona-gpio");