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>

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f43ef5b..c64fa8d 100644 (file)
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -93,4 +93,4 @@ obj-$(CONFIG_MFD_CS5535)      += cs5535-mfd.o
 obj-$(CONFIG_MFD_OMAP_USB_HOST)        += omap-usb-host.o
 obj-$(CONFIG_MFD_PM8921_CORE)  += pm8921-core.o
 obj-$(CONFIG_MFD_PM8XXX_IRQ)   += pm8xxx-irq.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 (file)
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 dbcdfb5..5a6a7be 100644 (file)
--- a/drivers/mfd/tps65910.c
+++ b/drivers/mfd/tps65910.c
@@ -135,8 +135,13 @@ 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;
@@ -154,6 +159,8 @@ 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 fa1b029..0e01d50 100644 (file)
--- 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;
 };
 
@@ -749,5 +750,6 @@ 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 */