gpio: palmas: Add support for Palmas GPIO

Add gpio driver for TI Palmas series PMIC. This has 8 gpio which can
work as input/output.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 184 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-palmas.c b/drivers/gpio/gpio-palmas.c
new file mode 100644
index 000000000000..e3a4e56f5a42
--- /dev/null
+++ b/drivers/gpio/gpio-palmas.c
@@ -0,0 +1,184 @@
+/*
+ * TI Palma series PMIC's GPIO driver.
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Author: Laxman Dewangan <ldewangan@nvidia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/palmas.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+struct palmas_gpio {
+        struct gpio_chip gpio_chip;
+        struct palmas *palmas;
+};
+
+static inline struct palmas_gpio *to_palmas_gpio(struct gpio_chip *chip)
+{
+        return container_of(chip, struct palmas_gpio, gpio_chip);
+}
+
+static int palmas_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+        struct palmas_gpio *pg = to_palmas_gpio(gc);
+        struct palmas *palmas = pg->palmas;
+        unsigned int val;
+        int ret;
+
+        ret = palmas_read(palmas, PALMAS_GPIO_BASE, PALMAS_GPIO_DATA_IN, &val);
+        if (ret < 0) {
+                dev_err(gc->dev, "GPIO_DATA_IN read failed, err = %d\n", ret);
+                return ret;
+        }
+        return !!(val & BIT(offset));
+}
+
+static void palmas_gpio_set(struct gpio_chip *gc, unsigned offset,
+                        int value)
+{
+        struct palmas_gpio *pg = to_palmas_gpio(gc);
+        struct palmas *palmas = pg->palmas;
+        int ret;
+
+        if (value)
+                ret = palmas_write(palmas, PALMAS_GPIO_BASE,
+                                PALMAS_GPIO_SET_DATA_OUT, BIT(offset));
+        else
+                ret = palmas_write(palmas, PALMAS_GPIO_BASE,
+                                PALMAS_GPIO_CLEAR_DATA_OUT, BIT(offset));
+        if (ret < 0)
+                dev_err(gc->dev, "%s write failed, err = %d\n",
+                        (value) ? "GPIO_SET_DATA_OUT" : "GPIO_CLEAR_DATA_OUT",
+                        ret);
+}
+
+static int palmas_gpio_output(struct gpio_chip *gc, unsigned offset,
+                                int value)
+{
+        struct palmas_gpio *pg = to_palmas_gpio(gc);
+        struct palmas *palmas = pg->palmas;
+        int ret;
+
+        /* Set the initial value */
+        palmas_gpio_set(gc, offset, value);
+
+        ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE,
+                PALMAS_GPIO_DATA_DIR, BIT(offset), BIT(offset));
+        if (ret < 0)
+                dev_err(gc->dev, "GPIO_DATA_DIR write failed, err = %d\n", ret);
+        return ret;
+}
+
+static int palmas_gpio_input(struct gpio_chip *gc, unsigned offset)
+{
+        struct palmas_gpio *pg = to_palmas_gpio(gc);
+        struct palmas *palmas = pg->palmas;
+        int ret;
+
+        ret = palmas_update_bits(palmas, PALMAS_GPIO_BASE,
+                PALMAS_GPIO_DATA_DIR, BIT(offset), 0);
+        if (ret < 0)
+                dev_err(gc->dev, "GPIO_DATA_DIR write failed, err = %d\n", ret);
+        return ret;
+}
+
+static int palmas_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+        struct palmas_gpio *pg = to_palmas_gpio(gc);
+        struct palmas *palmas = pg->palmas;
+
+        return palmas_irq_get_virq(palmas, PALMAS_GPIO_0_IRQ + offset);
+}
+
+static int palmas_gpio_probe(struct platform_device *pdev)
+{
+        struct palmas *palmas = dev_get_drvdata(pdev->dev.parent);
+        struct palmas_platform_data *palmas_pdata;
+        struct palmas_gpio *palmas_gpio;
+        int ret;
+
+        palmas_gpio = devm_kzalloc(&pdev->dev,
+                                sizeof(*palmas_gpio), GFP_KERNEL);
+        if (!palmas_gpio) {
+                dev_err(&pdev->dev, "Could not allocate palmas_gpio\n");
+                return -ENOMEM;
+        }
+
+        palmas_gpio->palmas = palmas;
+        palmas_gpio->gpio_chip.owner = THIS_MODULE;
+        palmas_gpio->gpio_chip.label = dev_name(&pdev->dev);
+        palmas_gpio->gpio_chip.ngpio = 8;
+        palmas_gpio->gpio_chip.can_sleep = 1;
+        palmas_gpio->gpio_chip.direction_input = palmas_gpio_input;
+        palmas_gpio->gpio_chip.direction_output = palmas_gpio_output;
+        palmas_gpio->gpio_chip.to_irq = palmas_gpio_to_irq;
+        palmas_gpio->gpio_chip.set      = palmas_gpio_set;
+        palmas_gpio->gpio_chip.get      = palmas_gpio_get;
+        palmas_gpio->gpio_chip.dev = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+        palmas_gpio->gpio_chip.of_node = palmas->dev->of_node;
+#endif
+        palmas_pdata = dev_get_platdata(palmas->dev);
+        if (palmas_pdata && palmas_pdata->gpio_base)
+                palmas_gpio->gpio_chip.base = palmas_pdata->gpio_base;
+        else
+                palmas_gpio->gpio_chip.base = -1;
+
+        ret = gpiochip_add(&palmas_gpio->gpio_chip);
+        if (ret < 0) {
+                dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
+                return ret;
+        }
+
+        platform_set_drvdata(pdev, palmas_gpio);
+        return ret;
+}
+
+static int palmas_gpio_remove(struct platform_device *pdev)
+{
+        struct palmas_gpio *palmas_gpio = platform_get_drvdata(pdev);
+
+        return gpiochip_remove(&palmas_gpio->gpio_chip);
+}
+
+static struct platform_driver palmas_gpio_driver = {
+        .driver.name    = "palmas-gpio",
+        .driver.owner   = THIS_MODULE,
+        .probe          = palmas_gpio_probe,
+        .remove         = palmas_gpio_remove,
+};
+
+static int __init palmas_gpio_init(void)
+{
+        return platform_driver_register(&palmas_gpio_driver);
+}
+subsys_initcall(palmas_gpio_init);
+
+static void __exit palmas_gpio_exit(void)
+{
+        platform_driver_unregister(&palmas_gpio_driver);
+}
+module_exit(palmas_gpio_exit);
+
+MODULE_ALIAS("platform:palmas-gpio");
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_DESCRIPTION("GPIO driver for TI Palmas series PMICs");
+MODULE_LICENSE("GPL v2");