TPS65910: GPIO: Add GPIO driver

TPS65910 has one configurable GPIO that can be used for several
purposes. Subsequent versions of the TPS chip support more than
one GPIO.

Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 91 insertions, 0 deletions

diff --git a/drivers/mfd/tps65910-gpio.c b/drivers/mfd/tps65910-gpio.c
new file mode 100644
index 000000000000..f3ae37652446
--- /dev/null
+++ b/drivers/mfd/tps65910-gpio.c
@@ -0,0 +1,91 @@
+/*
+ * tps65910-gpio.c  --  TI TPS6591x
+ *
+ * Copyright 2010 Texas Instruments Inc.
+ *
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ * Author: Jorge Eduardo Candelaria jedu@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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/mfd/tps65910.h>
+
+static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+        struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
+        uint8_t val;
+
+        tps65910->read(tps65910, TPS65910_GPIO0, 1, &val);
+
+        if (val & GPIO0_GPIO_STS_MASK)
+                return 1;
+
+        return 0;
+}
+
+static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
+                              int value)
+{
+        struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
+
+        if (value)
+                tps65910_set_bits(tps65910, TPS65910_GPIO0,
+                                        GPIO0_GPIO_SET_MASK);
+        else
+                tps65910_clear_bits(tps65910, TPS65910_GPIO0,
+                                        GPIO0_GPIO_SET_MASK);
+}
+
+static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
+                                int value)
+{
+        struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
+
+        /* Set the initial value */
+        tps65910_gpio_set(gc, 0, value);
+
+        return tps65910_set_bits(tps65910, TPS65910_GPIO0, GPIO0_GPIO_CFG_MASK);
+}
+
+static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
+{
+        struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
+
+        return tps65910_clear_bits(tps65910, TPS65910_GPIO0,
+                                        GPIO0_GPIO_CFG_MASK);
+}
+
+void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
+{
+        int ret;
+
+        if (!gpio_base)
+                return;
+
+        tps65910->gpio.owner            = THIS_MODULE;
+        tps65910->gpio.label            = tps65910->i2c_client->name;
+        tps65910->gpio.dev              = tps65910->dev;
+        tps65910->gpio.base             = gpio_base;
+        tps65910->gpio.ngpio            = 1;
+        tps65910->gpio.can_sleep        = 1;
+
+        tps65910->gpio.direction_input  = tps65910_gpio_input;
+        tps65910->gpio.direction_output = tps65910_gpio_output;
+        tps65910->gpio.set              = tps65910_gpio_set;
+        tps65910->gpio.get              = tps65910_gpio_get;
+
+        ret = gpiochip_add(&tps65910->gpio);
+
+        if (ret)
+                dev_warn(tps65910->dev, "GPIO registration failed: %d\n", ret);
+}