Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpio / gpio-tps65912.c

diff --git a/kernel/drivers/gpio/gpio-tps65912.c b/kernel/drivers/gpio/gpio-tps65912.c
new file mode 100644 (file)
index 0000000..9cdbc0c
--- /dev/null
+++ b/kernel/drivers/gpio/gpio-tps65912.c
@@ -0,0 +1,153 @@
+/*
+ * Copyright 2011 Texas Instruments Inc.
+ *
+ * Author: Margarita Olaya <magi@slimlogic.co.uk>
+ *
+ *  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.
+ *
+ * This driver is based on wm8350 implementation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/platform_device.h>
+#include <linux/seq_file.h>
+#include <linux/slab.h>
+#include <linux/mfd/tps65912.h>
+
+struct tps65912_gpio_data {
+       struct tps65912 *tps65912;
+       struct gpio_chip gpio_chip;
+};
+
+#define to_tgd(gc) container_of(gc, struct tps65912_gpio_data, gpio_chip)
+
+static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+       struct tps65912_gpio_data *tps65912_gpio = to_tgd(gc);
+       struct tps65912 *tps65912 = tps65912_gpio->tps65912;
+       int val;
+
+       val = tps65912_reg_read(tps65912, TPS65912_GPIO1 + offset);
+
+       if (val & GPIO_STS_MASK)
+               return 1;
+
+       return 0;
+}
+
+static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
+                             int value)
+{
+       struct tps65912_gpio_data *tps65912_gpio = to_tgd(gc);
+       struct tps65912 *tps65912 = tps65912_gpio->tps65912;
+
+       if (value)
+               tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
+                                                       GPIO_SET_MASK);
+       else
+               tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
+                                                               GPIO_SET_MASK);
+}
+
+static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset,
+                               int value)
+{
+       struct tps65912_gpio_data *tps65912_gpio = to_tgd(gc);
+       struct tps65912 *tps65912 = tps65912_gpio->tps65912;
+
+       /* Set the initial value */
+       tps65912_gpio_set(gc, offset, value);
+
+       return tps65912_set_bits(tps65912, TPS65912_GPIO1 + offset,
+                                                               GPIO_CFG_MASK);
+}
+
+static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset)
+{
+       struct tps65912_gpio_data *tps65912_gpio = to_tgd(gc);
+       struct tps65912 *tps65912 = tps65912_gpio->tps65912;
+
+       return tps65912_clear_bits(tps65912, TPS65912_GPIO1 + offset,
+                                                               GPIO_CFG_MASK);
+}
+
+static struct gpio_chip template_chip = {
+       .label                  = "tps65912",
+       .owner                  = THIS_MODULE,
+       .direction_input        = tps65912_gpio_input,
+       .direction_output       = tps65912_gpio_output,
+       .get                    = tps65912_gpio_get,
+       .set                    = tps65912_gpio_set,
+       .can_sleep              = true,
+       .ngpio                  = 5,
+       .base                   = -1,
+};
+
+static int tps65912_gpio_probe(struct platform_device *pdev)
+{
+       struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
+       struct tps65912_board *pdata = dev_get_platdata(tps65912->dev);
+       struct tps65912_gpio_data *tps65912_gpio;
+       int ret;
+
+       tps65912_gpio = devm_kzalloc(&pdev->dev, sizeof(*tps65912_gpio),
+                                    GFP_KERNEL);
+       if (tps65912_gpio == NULL)
+               return -ENOMEM;
+
+       tps65912_gpio->tps65912 = tps65912;
+       tps65912_gpio->gpio_chip = template_chip;
+       tps65912_gpio->gpio_chip.dev = &pdev->dev;
+       if (pdata && pdata->gpio_base)
+               tps65912_gpio->gpio_chip.base = pdata->gpio_base;
+
+       ret = gpiochip_add(&tps65912_gpio->gpio_chip);
+       if (ret < 0) {
+               dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
+               return ret;
+       }
+
+       platform_set_drvdata(pdev, tps65912_gpio);
+
+       return ret;
+}
+
+static int tps65912_gpio_remove(struct platform_device *pdev)
+{
+       struct tps65912_gpio_data  *tps65912_gpio = platform_get_drvdata(pdev);
+
+       gpiochip_remove(&tps65912_gpio->gpio_chip);
+       return 0;
+}
+
+static struct platform_driver tps65912_gpio_driver = {
+       .driver = {
+               .name = "tps65912-gpio",
+       },
+       .probe = tps65912_gpio_probe,
+       .remove = tps65912_gpio_remove,
+};
+
+static int __init tps65912_gpio_init(void)
+{
+       return platform_driver_register(&tps65912_gpio_driver);
+}
+subsys_initcall(tps65912_gpio_init);
+
+static void __exit tps65912_gpio_exit(void)
+{
+       platform_driver_unregister(&tps65912_gpio_driver);
+}
+module_exit(tps65912_gpio_exit);
+
+MODULE_AUTHOR("Margarita Olaya Cabrera <magi@slimlogic.co.uk>");
+MODULE_DESCRIPTION("GPIO interface for TPS65912 PMICs");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:tps65912-gpio");