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Subject[PATCHv4 3/4][RESEND] tps65912: gpio: add gpio driver
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TPS65912 has five GPIOs that can be configured for different
purposes.

Signed-off-by: Margarita Olaya Cabrera <magi@slimlogic.co.uk>
---
drivers/gpio/Kconfig | 6 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/tps65912-gpio.c | 159 ++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/tps65912.h | 1 +
4 files changed, 167 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/tps65912-gpio.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d3b2953..7d79b7d 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -247,6 +247,12 @@ config GPIO_TWL4030
Say yes here to access the GPIO signals of various multi-function
power management chips from Texas Instruments.

+config GPIO_TPS65912
+ tristate "TI TPS65912 GPIO"
+ depends on (MFD_TPS65912_I2C || MFD_TPS65912_SPI)
+ help
+ This driver supports TPS65912 gpio chip
+
config GPIO_WM831X
tristate "WM831x GPIOs"
depends on MFD_WM831X
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index becef59..f03ccc4 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_GPIO_STMPE) += stmpe-gpio.o
obj-$(CONFIG_GPIO_TC3589X) += tc3589x-gpio.o
obj-$(CONFIG_GPIO_TIMBERDALE) += timbgpio.o
obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o
+obj-$(CONFIG_GPIO_TPS65912) += tps65912-gpio.o
obj-$(CONFIG_GPIO_UCB1400) += ucb1400_gpio.o
obj-$(CONFIG_GPIO_XILINX) += xilinx_gpio.o
obj-$(CONFIG_GPIO_CS5535) += cs5535-gpio.o
diff --git a/drivers/gpio/tps65912-gpio.c b/drivers/gpio/tps65912-gpio.c
new file mode 100644
index 0000000..2be15a2
--- /dev/null
+++ b/drivers/gpio/tps65912-gpio.c
@@ -0,0 +1,159 @@
+/*
+ * tps65912-gpio.c -- TI TPS6591x
+ *
+ * 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;
+};
+
+static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct tps65912 *tps65912 = container_of(gc, struct tps65912, gpio);
+ 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 *tps65912 = container_of(gc, struct tps65912, gpio);
+
+ 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 *tps65912 = container_of(gc, struct tps65912, gpio);
+
+ /* 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 *tps65912 = container_of(gc, struct tps65912, gpio);
+
+ 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 = 1,
+};
+
+static int __devinit tps65912_gpio_probe(struct platform_device *pdev)
+{
+ struct tps65912 *tps65912 = dev_get_drvdata(pdev->dev.parent);
+ struct tps65912_board *pdata = tps65912->dev->platform_data;
+ struct tps65912_gpio_data *tps65912_gpio;
+ int ret;
+
+ tps65912_gpio = kzalloc(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.ngpio = 5;
+ tps65912_gpio->gpio_chip.dev = &pdev->dev;
+ if (pdata && pdata->gpio_base)
+ tps65912_gpio->gpio_chip.base = pdata->gpio_base;
+ else
+ tps65912_gpio->gpio_chip.base = -1;
+
+ ret = gpiochip_add(&tps65912_gpio->gpio_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to register gpiochip, %d\n", ret);
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, tps65912_gpio);
+
+ return ret;
+
+err:
+ kfree(tps65912_gpio);
+ return ret;
+}
+
+static int __devexit tps65912_gpio_remove(struct platform_device *pdev)
+{
+ struct tps65912_gpio_data *tps65912_gpio = platform_get_drvdata(pdev);
+ int ret;
+
+ ret = gpiochip_remove(&tps65912_gpio->gpio_chip);
+ if (ret == 0)
+ kfree(tps65912_gpio);
+
+ return ret;
+}
+
+static struct platform_driver tps65912_gpio_driver = {
+ .driver = {
+ .name = "tps65912-gpio",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps65912_gpio_probe,
+ .remove = __devexit_p(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");
diff --git a/include/linux/mfd/tps65912.h b/include/linux/mfd/tps65912.h
index be60fb2..aaceab4 100644
--- a/include/linux/mfd/tps65912.h
+++ b/include/linux/mfd/tps65912.h
@@ -275,6 +275,7 @@ struct tps65912_board {
int is_dcdc4_avs;
int irq;
int irq_base;
+ int gpio_base;
struct regulator_init_data *tps65912_pmic_init_data;
};

--
1.7.0.4

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