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Subject[PATCHv5 2/4] TPS65910: GPIO: Add GPIO driver
Date
From: Graeme Gregory <gg@slimlogic.co.uk>

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>
---
drivers/mfd/Makefile | 2 +-
drivers/mfd/tps65910-gpio.c | 91 ++++++++++++++++++++++++++++++++++++++++++
drivers/mfd/tps65910.c | 7 +++
include/linux/mfd/tps65910.h | 2 +
4 files changed, 101 insertions(+), 1 deletions(-)
create mode 100644 drivers/mfd/tps65910-gpio.c

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 3afb7ac..012ed17 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -88,4 +88,4 @@ obj-$(CONFIG_MFD_VX855) += vx855.o
obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o
obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o
-obj-$(CONFIG_MFD_TPS65910) += tps65910.o
+obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-gpio.o
diff --git a/drivers/mfd/tps65910-gpio.c b/drivers/mfd/tps65910-gpio.c
new file mode 100644
index 0000000..f3ae376
--- /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);
+}
diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
index 43e73cf..5bd3115 100644
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -137,8 +137,13 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct tps65910 *tps65910;
+ struct tps65910_board *pmic_plat_data;
int ret = 0;

+ pmic_plat_data = dev_get_platdata(&i2c->dev);
+ if (!pmic_plat_data)
+ return -EINVAL;
+
tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
if (tps65910 == NULL)
return -ENOMEM;
@@ -155,6 +160,8 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
if (ret < 0)
goto err;

+ tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
+
return ret;

err:
diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h
index fd2be22..b19cd04 100644
--- a/include/linux/mfd/tps65910.h
+++ b/include/linux/mfd/tps65910.h
@@ -714,6 +714,7 @@
*/

struct tps65910_board {
+ int gpio_base;
struct regulator_init_data *tps65910_pmic_init_data;
};

@@ -748,5 +749,6 @@ struct tps65910_platform_data {

int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask);
int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask);
+void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base);

#endif /* __LINUX_MFD_TPS65910_H */
--
1.7.1


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