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Message-Id: <1333959955-968-2-git-send-email-ldewangan@nvidia.com>
Date: Mon, 9 Apr 2012 13:55:54 +0530
From: Laxman Dewangan <ldewangan@...dia.com>
To: grant.likely@...retlab.ca, linus.walleij@...ricsson.com,
sameo@...ux.intel.com, ldewangan@...dia.com
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH V2 1/2] gpio: 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@...dia.com>
---
drivers/gpio/Kconfig | 9 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-rc5t583.c | 195 +++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/rc5t583.h | 9 ++
4 files changed, 214 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/gpio-rc5t583.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index e03653d..4e1bd9e 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -288,6 +288,15 @@ 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 007f54b..a27bf53 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_GPIO_PCF857X) += gpio-pcf857x.o
obj-$(CONFIG_GPIO_PCH) += gpio-pch.o
obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
obj-$(CONFIG_GPIO_PXA) += gpio-pxa.o
+obj-$(CONFIG_GPIO_RC5T583) += gpio-rc5t583.o
obj-$(CONFIG_GPIO_RDC321X) += gpio-rdc321x.o
obj-$(CONFIG_PLAT_SAMSUNG) += gpio-samsung.o
obj-$(CONFIG_ARCH_SA1100) += gpio-sa1100.o
diff --git a/drivers/gpio/gpio-rc5t583.c b/drivers/gpio/gpio-rc5t583.c
new file mode 100644
index 0000000..4990789
--- /dev/null
+++ b/drivers/gpio/gpio-rc5t583.c
@@ -0,0 +1,195 @@
+/*
+ * GPIO driver for RICOH583 power management chip.
+ *
+ * Copyright (c) 2011-2012, NVIDIA CORPORATION. All rights reserved.
+ * Author: Laxman dewangan <ldewangan@...dia.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>
+
+static int rc5t583_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rc5t583 *rc5t583 = dev_get_drvdata(chip->dev);
+ uint8_t val;
+ int ret;
+
+ ret = rc5t583_read(rc5t583->dev, RC5T583_GPIO_MON_IOIN, &val);
+ if (ret < 0)
+ return ret;
+
+ return !!(val & BIT(offset));
+}
+
+static void rc5t583_gpio_set(struct gpio_chip *chip, unsigned int offset,
+ int value)
+{
+ struct rc5t583 *rc5t583 = dev_get_drvdata(chip->dev);
+ if (value)
+ rc5t583_set_bits(rc5t583->dev, RC5T583_GPIO_IOOUT, BIT(offset));
+ else
+ rc5t583_clear_bits(rc5t583->dev, RC5T583_GPIO_IOOUT,
+ BIT(offset));
+}
+
+static int rc5t583_gpio_input(struct gpio_chip *chip, unsigned int offset)
+{
+ struct rc5t583 *rc5t583 = dev_get_drvdata(chip->dev);
+ return rc5t583_clear_bits(rc5t583->dev, RC5T583_GPIO_IOSEL,
+ BIT(offset));
+}
+
+static int rc5t583_gpio_output(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ struct rc5t583 *rc5t583 = dev_get_drvdata(chip->dev);
+ rc5t583_gpio_set(chip, offset, value);
+ return rc5t583_set_bits(rc5t583->dev, RC5T583_GPIO_IOSEL, BIT(offset));
+}
+
+static int rc5t583_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+ struct rc5t583 *rc5t583 = dev_get_drvdata(chip->dev);
+ if ((offset >= 0) && (offset < 8))
+ return rc5t583->irq_base + RC5T583_IRQ_GPIO0 + offset;
+ return -EINVAL;
+}
+
+static int rc5t583_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+ struct rc5t583 *rc5t583 = dev_get_drvdata(chip->dev);
+ return rc5t583_clear_bits(rc5t583->dev, RC5T583_GPIO_PGSEL,
+ BIT(offset));
+}
+
+static void rc5t583_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+ struct rc5t583 *rc5t583 = dev_get_drvdata(chip->dev);
+ rc5t583_set_bits(rc5t583->dev, 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);
+ int ret;
+ int i;
+
+ if (!pdata) {
+ dev_err(&pdev->dev, "No platform data, exiting...\n");
+ return -ENODEV;
+ }
+ if (pdata->gpio_base <= 0) {
+ dev_err(&pdev->dev,
+ "GPIO base is not valid %d\n", pdata->gpio_base);
+ return -EINVAL;
+ }
+
+ rc5t583->gpio_chip = devm_kzalloc(rc5t583->dev,
+ sizeof(struct gpio_chip), GFP_KERNEL);
+ if (!rc5t583->gpio_chip) {
+ dev_warn(rc5t583->dev,
+ "%s(): Memory allocation error\n", __func__);
+ return -ENOMEM;
+ }
+
+ rc5t583->gpio_chip->label = "gpio-rc5t583",
+ rc5t583->gpio_chip->owner = THIS_MODULE,
+ rc5t583->gpio_chip->request = rc5t583_gpio_request,
+ rc5t583->gpio_chip->free = rc5t583_gpio_free,
+ rc5t583->gpio_chip->direction_input = rc5t583_gpio_input,
+ rc5t583->gpio_chip->direction_output = rc5t583_gpio_output,
+ rc5t583->gpio_chip->set = rc5t583_gpio_set,
+ rc5t583->gpio_chip->get = rc5t583_gpio_get,
+ rc5t583->gpio_chip->to_irq = rc5t583_gpio_to_irq,
+ rc5t583->gpio_chip->ngpio = RC5T583_MAX_GPIO,
+ rc5t583->gpio_chip->can_sleep = 1,
+ rc5t583->gpio_chip->dev = &pdev->dev;
+ rc5t583->gpio_chip->base = pdata->gpio_base;
+
+ platform_set_drvdata(pdev, rc5t583);
+
+ for (i = 0; i < RC5T583_MAX_GPIO; ++i) {
+ if (pdata->gpio_enable_pulldn[i])
+ ret = rc5t583_set_bits(rc5t583->dev,
+ RC5T583_GPIO_PDEN, BIT(i));
+ else
+ ret = rc5t583_clear_bits(rc5t583->dev,
+ RC5T583_GPIO_PDEN, BIT(i));
+ if (ret < 0)
+ goto end;
+
+ if (pdata->gpio_init_flag[i] & GPIOF_IN)
+ ret = rc5t583_gpio_input(rc5t583->gpio_chip, i);
+ else
+ ret = rc5t583_gpio_output(rc5t583->gpio_chip, i,
+ !!(pdata->gpio_init_flag[i] & GPIOF_INIT_HIGH));
+ if (ret < 0)
+ goto end;
+
+ ret = rc5t583_clear_bits(rc5t583->dev, RC5T583_GPIO_PGSEL,
+ BIT(i));
+ if (ret < 0)
+ goto end;
+ }
+
+ ret = gpiochip_add(rc5t583->gpio_chip);
+ if (ret < 0)
+ goto end;
+
+ return 0;
+end:
+ dev_err(&pdev->dev, "Could not register gpio %d\n", ret);
+ return ret;
+}
+
+static int __devexit rc5t583_gpio_remove(struct platform_device *pdev)
+{
+ struct rc5t583 *rc5t583 = platform_get_drvdata(pdev);
+ return gpiochip_remove(rc5t583->gpio_chip);
+}
+
+static struct platform_driver rc5t583_gpio_driver = {
+ .driver.name = "rc5t583-gpio",
+ .driver.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@...dia.com>");
+MODULE_DESCRIPTION("GPIO interface for RC5T583");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:rc5t583-gpio");
diff --git a/include/linux/mfd/rc5t583.h b/include/linux/mfd/rc5t583.h
index a2c6160..f5e64b2 100644
--- a/include/linux/mfd/rc5t583.h
+++ b/include/linux/mfd/rc5t583.h
@@ -252,6 +252,8 @@ enum {
struct rc5t583 {
struct device *dev;
struct regmap *regmap;
+ int gpio_base;
+ struct gpio_chip *gpio_chip;
int chip_irq;
int irq_base;
struct mutex irq_lock;
@@ -270,13 +272,20 @@ struct rc5t583 {
/*
* rc5t583_platform_data: Platform data for ricoh rc5t583 pmu.
* The board specific data is provided through this structure.
+ * @gpio_base: Gpio base number on which device starts its gpio.
* @irq_base: Irq base number on which this device registers their interrupts.
* @enable_shutdown: Enable shutdown through the input pin "shutdown".
+ * @gpio_enable_pulldn: Enable internal pull down of gpios.
+ * @gpio_init_flag: Initial gpio flag which need to be configure during gpio
+ * registration.
*/
struct rc5t583_platform_data {
+ int gpio_base;
int irq_base;
bool enable_shutdown;
+ bool gpio_enable_pulldn[RC5T583_MAX_GPIO];
+ unsigned int gpio_init_flag[RC5T583_MAX_GPIO];
};
int rc5t583_write(struct device *dev, u8 reg, uint8_t val);
--
1.7.1.1
--
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