DA9055 GPIO driver

This is the GPIO patch for the DA9055 PMIC. This patch has got
dependency on the DA9055 MFD core.

This patch is functionally tested on SMDK6410 board.

Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 216 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d055cee36942..150eeb705fbc 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -86,6 +86,17 @@ config GPIO_DA9052
         help
           Say yes here to enable the GPIO driver for the DA9052 chip.
 
+config GPIO_DA9055
+        tristate "Dialog Semiconductor DA9055 GPIO"
+        depends on MFD_DA9055
+        help
+          Say yes here to enable the GPIO driver for the DA9055 chip.
+
+          The Dialog DA9055 PMIC chip has 3 GPIO pins that can be
+          be controller by this driver.
+
+          If driver is built as a module it will be called gpio-da9055.
+
 config GPIO_MAX730X
         tristate
 
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 9aeed6707326..e6f8e379a2ec 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_GPIO_ARIZONA)	+= gpio-arizona.o
 obj-$(CONFIG_GPIO_BT8XX)        += gpio-bt8xx.o
 obj-$(CONFIG_GPIO_CS5535)       += gpio-cs5535.o
 obj-$(CONFIG_GPIO_DA9052)       += gpio-da9052.o
+obj-$(CONFIG_GPIO_DA9055)       += gpio-da9055.o
 obj-$(CONFIG_ARCH_DAVINCI)      += gpio-davinci.o
 obj-$(CONFIG_GPIO_EM)           += gpio-em.o
 obj-$(CONFIG_GPIO_EP93XX)       += gpio-ep93xx.o
diff --git a/drivers/gpio/gpio-da9055.c b/drivers/gpio/gpio-da9055.c
new file mode 100644
index 000000000000..55d83c7d9c7f
--- /dev/null
+++ b/drivers/gpio/gpio-da9055.c
@@ -0,0 +1,204 @@
+/*
+ * GPIO Driver for Dialog DA9055 PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ *  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/module.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+#include <linux/mfd/da9055/core.h>
+#include <linux/mfd/da9055/reg.h>
+#include <linux/mfd/da9055/pdata.h>
+
+#define DA9055_VDD_IO                   0x0
+#define DA9055_PUSH_PULL                0x3
+#define DA9055_ACT_LOW                  0x0
+#define DA9055_GPI                      0x1
+#define DA9055_PORT_MASK                0x3
+#define DA9055_PORT_SHIFT(offset)       (4 * (offset % 2))
+
+#define DA9055_INPUT                    DA9055_GPI
+#define DA9055_OUTPUT                   DA9055_PUSH_PULL
+#define DA9055_IRQ_GPI0                 3
+
+struct da9055_gpio {
+        struct da9055 *da9055;
+        struct gpio_chip gp;
+};
+
+static inline struct da9055_gpio *to_da9055_gpio(struct gpio_chip *chip)
+{
+        return container_of(chip, struct da9055_gpio, gp);
+}
+
+static int da9055_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+        struct da9055_gpio *gpio = to_da9055_gpio(gc);
+        int gpio_direction = 0;
+        int ret;
+
+        /* Get GPIO direction */
+        ret = da9055_reg_read(gpio->da9055, (offset >> 1) + DA9055_REG_GPIO0_1);
+        if (ret < 0)
+                return ret;
+
+        gpio_direction = ret & (DA9055_PORT_MASK) << DA9055_PORT_SHIFT(offset);
+        gpio_direction >>= DA9055_PORT_SHIFT(offset);
+        switch (gpio_direction) {
+        case DA9055_INPUT:
+                ret = da9055_reg_read(gpio->da9055, DA9055_REG_STATUS_B);
+                if (ret < 0)
+                        return ret;
+                break;
+        case DA9055_OUTPUT:
+                ret = da9055_reg_read(gpio->da9055, DA9055_REG_GPIO_MODE0_2);
+                if (ret < 0)
+                        return ret;
+        }
+
+        return ret & (1 << offset);
+
+}
+
+static void da9055_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+        struct da9055_gpio *gpio = to_da9055_gpio(gc);
+
+        da9055_reg_update(gpio->da9055,
+                        DA9055_REG_GPIO_MODE0_2,
+                        1 << offset,
+                        value << offset);
+}
+
+static int da9055_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+        struct da9055_gpio *gpio = to_da9055_gpio(gc);
+        unsigned char reg_byte;
+
+        reg_byte = (DA9055_ACT_LOW | DA9055_GPI)
+                                << DA9055_PORT_SHIFT(offset);
+
+        return da9055_reg_update(gpio->da9055, (offset >> 1) +
+                                DA9055_REG_GPIO0_1,
+                                DA9055_PORT_MASK <<
+                                DA9055_PORT_SHIFT(offset),
+                                reg_byte);
+}
+
+static int da9055_gpio_direction_output(struct gpio_chip *gc,
+                                        unsigned offset, int value)
+{
+        struct da9055_gpio *gpio = to_da9055_gpio(gc);
+        unsigned char reg_byte;
+        int ret;
+
+        reg_byte = (DA9055_VDD_IO | DA9055_PUSH_PULL)
+                                        << DA9055_PORT_SHIFT(offset);
+
+        ret = da9055_reg_update(gpio->da9055, (offset >> 1) +
+                                DA9055_REG_GPIO0_1,
+                                DA9055_PORT_MASK <<
+                                DA9055_PORT_SHIFT(offset),
+                                reg_byte);
+        if (ret < 0)
+                return ret;
+
+        da9055_gpio_set(gc, offset, value);
+
+        return 0;
+}
+
+static int da9055_gpio_to_irq(struct gpio_chip *gc, u32 offset)
+{
+        struct da9055_gpio *gpio = to_da9055_gpio(gc);
+        struct da9055 *da9055 = gpio->da9055;
+
+        return regmap_irq_get_virq(da9055->irq_data,
+                                  DA9055_IRQ_GPI0 + offset);
+}
+
+static struct gpio_chip reference_gp __devinitdata = {
+        .label = "da9055-gpio",
+        .owner = THIS_MODULE,
+        .get = da9055_gpio_get,
+        .set = da9055_gpio_set,
+        .direction_input = da9055_gpio_direction_input,
+        .direction_output = da9055_gpio_direction_output,
+        .to_irq = da9055_gpio_to_irq,
+        .can_sleep = 1,
+        .ngpio = 3,
+        .base = -1,
+};
+
+static int __devinit da9055_gpio_probe(struct platform_device *pdev)
+{
+        struct da9055_gpio *gpio;
+        struct da9055_pdata *pdata;
+        int ret;
+
+        gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
+        if (gpio == NULL)
+                return -ENOMEM;
+
+        gpio->da9055 = dev_get_drvdata(pdev->dev.parent);
+        pdata = gpio->da9055->dev->platform_data;
+
+        gpio->gp = reference_gp;
+        if (pdata && pdata->gpio_base)
+                gpio->gp.base = pdata->gpio_base;
+
+        ret = gpiochip_add(&gpio->gp);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+                goto err_mem;
+        }
+
+        platform_set_drvdata(pdev, gpio);
+
+        return 0;
+
+err_mem:
+        return ret;
+}
+
+static int __devexit da9055_gpio_remove(struct platform_device *pdev)
+{
+        struct da9055_gpio *gpio = platform_get_drvdata(pdev);
+
+        return gpiochip_remove(&gpio->gp);
+}
+
+static struct platform_driver da9055_gpio_driver = {
+        .probe = da9055_gpio_probe,
+        .remove = __devexit_p(da9055_gpio_remove),
+        .driver = {
+                .name   = "da9055-gpio",
+                .owner  = THIS_MODULE,
+        },
+};
+
+static int __init da9055_gpio_init(void)
+{
+        return platform_driver_register(&da9055_gpio_driver);
+}
+subsys_initcall(da9055_gpio_init);
+
+static void __exit da9055_gpio_exit(void)
+{
+        platform_driver_unregister(&da9055_gpio_driver);
+}
+module_exit(da9055_gpio_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("DA9055 GPIO Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9055-gpio");