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authorLaxman Dewangan <ldewangan@nvidia.com>2012-05-14 12:46:12 +0530
committerSimone Willett <swillett@nvidia.com>2012-06-03 08:09:23 -0700
commit5e02816d609930478383597ae20dba5a68cc001a (patch)
tree7845ff9815e4ce70e950a94bdca7d37795547c1d /drivers
parentc7afbb56d4be5f18a9e02ff07d18bfb6ea10b2b6 (diff)
gpio/rc5t583: add gpio driver for RICOH PMIC RC5T583
The PMIC device RC5T583 from RICOH supports 8 gpios. Adding gpio driver for this device to access the pins control through gpio library. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> [grant.likely: slight cosmetic changes] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> (Cherry-picked from mainline e9fe32bcadb8a7a40411d77f168abd45941b049b) Change-Id: Id11f0dec229a92ce0ddcf606376ff83b6e14ca90 Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Reviewed-on: http://git-master/r/105885 Reviewed-by: Automatic_Commit_Validation_User GVS: Gerrit_Virtual_Submit Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpio/Kconfig9
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/gpio-rc5t583.c180
3 files changed, 190 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d539efd96d4b..9b304f254f98 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -271,6 +271,15 @@ config GPIO_PCF857X
This driver provides an in-kernel interface to those GPIOs using
platform-neutral GPIO calls.
+config GPIO_RC5T583
+ bool "RICOH RC5T583 GPIO"
+ depends on MFD_RC5T583
+ help
+ Select this option to enable GPIO driver for the Ricoh RC5T583
+ chip family.
+ This driver provides the support for driving/reading the gpio pins
+ of RC5T583 device through standard gpio library.
+
config GPIO_SX150X
bool "Semtech SX150x I2C GPIO expander"
depends on I2C=y
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 9588948c96f0..4ef6785f446b 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_GPIO_PCA953X) += gpio-pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o
obj-$(CONFIG_GPIO_PCH) += gpio-pch.o
obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
+obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
obj-$(CONFIG_GPIO_PLAT_SAMSUNG) += gpio-plat-samsung.o
diff --git a/drivers/gpio/gpio-rc5t583.c b/drivers/gpio/gpio-rc5t583.c
new file mode 100644
index 000000000000..08428bf17718
--- /dev/null
+++ b/drivers/gpio/gpio-rc5t583.c
@@ -0,0 +1,180 @@
+/*
+ * GPIO driver for RICOH583 power management chip.
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
+ * Author: Laxman dewangan <ldewangan@nvidia.com>
+ *
+ * Based on code
+ * Copyright (C) 2011 RICOH COMPANY,LTD
+ *
+ * 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/init.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/mfd/rc5t583.h>
+
+struct rc5t583_gpio {
+ struct gpio_chip gpio_chip;
+ struct rc5t583 *rc5t583;
+};
+
+static inline struct rc5t583_gpio *to_rc5t583_gpio(struct gpio_chip *chip)
+{
+ return container_of(chip, struct rc5t583_gpio, gpio_chip);
+}
+
+static int rc5t583_gpio_get(struct gpio_chip *gc, unsigned int offset)
+{
+ struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
+ struct device *parent = rc5t583_gpio->rc5t583->dev;
+ uint8_t val = 0;
+ int ret;
+
+ ret = rc5t583_read(parent, RC5T583_GPIO_MON_IOIN, &val);
+ if (ret < 0)
+ return ret;
+
+ return !!(val & BIT(offset));
+}
+
+static void rc5t583_gpio_set(struct gpio_chip *gc, unsigned int offset, int val)
+{
+ struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
+ struct device *parent = rc5t583_gpio->rc5t583->dev;
+ if (val)
+ rc5t583_set_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
+ else
+ rc5t583_clear_bits(parent, RC5T583_GPIO_IOOUT, BIT(offset));
+}
+
+static int rc5t583_gpio_dir_input(struct gpio_chip *gc, unsigned int offset)
+{
+ struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
+ struct device *parent = rc5t583_gpio->rc5t583->dev;
+ int ret;
+
+ ret = rc5t583_clear_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
+ if (ret < 0)
+ return ret;
+
+ /* Set pin to gpio mode */
+ return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
+}
+
+static int rc5t583_gpio_dir_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
+ struct device *parent = rc5t583_gpio->rc5t583->dev;
+ int ret;
+
+ rc5t583_gpio_set(gc, offset, value);
+ ret = rc5t583_set_bits(parent, RC5T583_GPIO_IOSEL, BIT(offset));
+ if (ret < 0)
+ return ret;
+
+ /* Set pin to gpio mode */
+ return rc5t583_clear_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
+}
+
+static int rc5t583_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+ struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
+
+ if ((offset >= 0) && (offset < 8))
+ return rc5t583_gpio->rc5t583->irq_base +
+ RC5T583_IRQ_GPIO0 + offset;
+ return -EINVAL;
+}
+
+static void rc5t583_gpio_free(struct gpio_chip *gc, unsigned offset)
+{
+ struct rc5t583_gpio *rc5t583_gpio = to_rc5t583_gpio(gc);
+ struct device *parent = rc5t583_gpio->rc5t583->dev;
+
+ rc5t583_set_bits(parent, RC5T583_GPIO_PGSEL, BIT(offset));
+}
+
+static int __devinit rc5t583_gpio_probe(struct platform_device *pdev)
+{
+ struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
+ struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
+ struct rc5t583_gpio *rc5t583_gpio;
+
+ rc5t583_gpio = devm_kzalloc(&pdev->dev, sizeof(*rc5t583_gpio),
+ GFP_KERNEL);
+ if (!rc5t583_gpio) {
+ dev_warn(&pdev->dev, "Mem allocation for rc5t583_gpio failed");
+ return -ENOMEM;
+ }
+
+ rc5t583_gpio->gpio_chip.label = "gpio-rc5t583",
+ rc5t583_gpio->gpio_chip.owner = THIS_MODULE,
+ rc5t583_gpio->gpio_chip.free = rc5t583_gpio_free,
+ rc5t583_gpio->gpio_chip.direction_input = rc5t583_gpio_dir_input,
+ rc5t583_gpio->gpio_chip.direction_output = rc5t583_gpio_dir_output,
+ rc5t583_gpio->gpio_chip.set = rc5t583_gpio_set,
+ rc5t583_gpio->gpio_chip.get = rc5t583_gpio_get,
+ rc5t583_gpio->gpio_chip.to_irq = rc5t583_gpio_to_irq,
+ rc5t583_gpio->gpio_chip.ngpio = RC5T583_MAX_GPIO,
+ rc5t583_gpio->gpio_chip.can_sleep = 1,
+ rc5t583_gpio->gpio_chip.dev = &pdev->dev;
+ rc5t583_gpio->gpio_chip.base = -1;
+ rc5t583_gpio->rc5t583 = rc5t583;
+
+ if (pdata && pdata->gpio_base)
+ rc5t583_gpio->gpio_chip.base = pdata->gpio_base;
+
+ platform_set_drvdata(pdev, rc5t583_gpio);
+
+ return gpiochip_add(&rc5t583_gpio->gpio_chip);
+}
+
+static int __devexit rc5t583_gpio_remove(struct platform_device *pdev)
+{
+ struct rc5t583_gpio *rc5t583_gpio = platform_get_drvdata(pdev);
+
+ return gpiochip_remove(&rc5t583_gpio->gpio_chip);
+}
+
+static struct platform_driver rc5t583_gpio_driver = {
+ .driver = {
+ .name = "rc5t583-gpio",
+ .owner = THIS_MODULE,
+ },
+ .probe = rc5t583_gpio_probe,
+ .remove = __devexit_p(rc5t583_gpio_remove),
+};
+
+static int __init rc5t583_gpio_init(void)
+{
+ return platform_driver_register(&rc5t583_gpio_driver);
+}
+subsys_initcall(rc5t583_gpio_init);
+
+static void __exit rc5t583_gpio_exit(void)
+{
+ platform_driver_unregister(&rc5t583_gpio_driver);
+}
+module_exit(rc5t583_gpio_exit);
+
+MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
+MODULE_DESCRIPTION("GPIO interface for RC5T583");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:rc5t583-gpio");