[PATCHv1 2/11] GPIO: GPIO module of DA9052 PMIC driver

[Ashish Jangam]

Hi Mark,

GPIO Driver for Dialog Semiconductor DA9052 PMICs.

Changes made since last submission:
. read and write operation moved to MFD

Some additional information of this patch:
. This patch is thoroughly tested with the Samsung 6410 board using sysfs interface. 

Linux Kernel Version: 2.6.37

Signed-off-by: D. Chen <dchen@xxxxxxxxxxx>
---
diff -Naur orig_linux-2.6.37/drivers/gpio/da9052-gpio.c linux-2.6.37/drivers/gpio/da9052-gpio.c
--- orig_linux-2.6.37/drivers/gpio/da9052-gpio.c	1970-01-01 05:00:00.000000000 +0500
+++ linux-2.6.37/drivers/gpio/da9052-gpio.c	2011-03-31 19:53:32.000000000 +0500
@@ -0,0 +1,251 @@
+/*
+ * da9052-gpio.c  --  GPIO Driver for Dialog DA9052 PMICs
+ *
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * Author: Dajun Chen <dchen@xxxxxxxxxxx>
+ *
+ *  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/fs.h>
+#include <linux/uaccess.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/syscalls.h>
+#include <linux/seq_file.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/pdata.h>
+#include <linux/mfd/da9052/gpio.h>
+
+struct da9052_gpio {
+	struct da9052 *da9052;
+	struct gpio_chip gp;
+};
+
+static inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
+{
+	return container_of(chip, struct da9052_gpio, gp);
+}
+
+static unsigned char da9052_gpio_port_odd(unsigned offset)
+{
+	return offset % 2;
+}
+
+static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
+{
+	struct da9052_gpio *gpio = to_da9052_gpio(gc);
+	int ret;
+	int da9052_port_direction = 0;
+
+	ret =  da9052_reg_read(gpio->da9052, DA9052_GPIO_0_1_REG + (offset >> 1));
+	if (ret < 0)
+		return ret;
+
+	if (da9052_gpio_port_odd(offset)) {
+		da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
+		da9052_port_direction >>= 4;
+		}
+	else
+		da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
+
+	switch (da9052_port_direction) {
+	case DA9052_INPUT:
+		if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
+			ret = da9052_reg_read(gpio->da9052, DA9052_STATUS_C_REG);
+		else
+			ret = da9052_reg_read(gpio->da9052, DA9052_STATUS_D_REG);
+		if (ret < 0)
+			return ret;
+		if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
+			return 1;
+		else
+			return 0;
+	case DA9052_OUTPUT_PUSHPULL:
+		if (da9052_gpio_port_odd(offset))
+			return ret & DA9052_GPIO_ODD_PORT_MODE;
+		else
+			return ret & DA9052_GPIO_EVEN_PORT_MODE;
+	default:
+		return -EINVAL;
+	}
+
+}
+
+static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+	struct da9052_gpio *gpio = to_da9052_gpio(gc);
+	int ret;
+	unsigned char register_value = 0;
+
+	if (da9052_gpio_port_odd(offset)) {
+		if (value)
+			register_value = DA9052_GPIO_ODD_PORT_MODE;
+			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+									DA9052_GPIO_0_1_REG,
+									DA9052_GPIO_ODD_PORT_MODE,
+									register_value);
+			if ( ret != 0 )
+				dev_err(gpio->da9052->dev, "Failed to updated gpio odd reg,%d",ret);
+	} else {
+		if (value)
+			register_value = DA9052_GPIO_EVEN_PORT_MODE;
+			ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+									DA9052_GPIO_0_1_REG,
+									DA9052_GPIO_EVEN_PORT_MODE,
+									register_value);
+			if ( ret != 0 )
+				dev_err(gpio->da9052->dev, "Failed to updated gpio even reg,%d",ret);
+	}
+}
+
+static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+	struct da9052_gpio *gpio = to_da9052_gpio(gc);
+	unsigned char register_value;
+	int ret;
+
+	/* Format: function - 2 bits type - 1 bit mode - 1 bit */
+	register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
+			 DA9052_DEBOUNCING_ON << 3;
+
+	if (da9052_gpio_port_odd(offset))
+		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+				DA9052_GPIO_0_1_REG,
+				DA9052_GPIO_MASK_UPPER_NIBBLE,
+				register_value <<
+				DA9052_GPIO_NIBBLE_SHIFT);
+	else
+		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+				DA9052_GPIO_0_1_REG,
+				DA9052_GPIO_MASK_LOWER_NIBBLE,
+				register_value);
+
+	return ret;
+}
+
+static int da9052_gpio_direction_output(struct gpio_chip *gc,
+					unsigned offset, int value)
+{
+	struct da9052_gpio *gpio = to_da9052_gpio(gc);
+	unsigned char register_value;
+	int ret;
+
+	/* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
+	register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
+			 value << 3;
+
+	if (da9052_gpio_port_odd(offset))
+		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+				DA9052_GPIO_0_1_REG,
+				DA9052_GPIO_MASK_UPPER_NIBBLE,
+				register_value <<
+				DA9052_GPIO_NIBBLE_SHIFT);
+	else
+		ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
+				DA9052_GPIO_0_1_REG,
+				DA9052_GPIO_MASK_LOWER_NIBBLE,
+				register_value);
+
+	return ret;
+}
+
+static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
+{
+	struct da9052_gpio *gpio;
+	gpio = to_da9052_gpio(gc);
+
+	return gpio->gp.base + offset;
+}
+
+static int __devinit da9052_gpio_probe(struct platform_device *pdev)
+{
+
+	struct da9052_gpio *gpio;
+	struct da9052_pdata *pdata;
+	int ret;
+
+	gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
+	if (gpio == NULL)
+		return -ENOMEM;
+
+	gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
+	pdata = gpio->da9052->dev->platform_data;
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "failed no platform data for GPIO\n");
+		ret = -ENOMEM;
+		goto err_mem;
+	}
+
+	gpio->da9052			= dev_get_drvdata(pdev->dev.parent);
+	gpio->gp.get			= da9052_gpio_get;
+	gpio->gp.set			= da9052_gpio_set;
+	gpio->gp.base			= pdata->gpio_base;
+	gpio->gp.ngpio			= pdata->num_gpio;
+	gpio->gp.can_sleep		= 1;
+	gpio->gp.to_irq			= da9052_gpio_to_irq;
+	gpio->gp.dev			= &pdev->dev;
+	gpio->gp.owner			= THIS_MODULE;
+	gpio->gp.label			= "da9052-gpio";
+	gpio->gp.direction_input	= da9052_gpio_direction_input;
+	gpio->gp.direction_output	= da9052_gpio_direction_output;
+
+	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:
+	kfree(gpio);
+	return ret;
+}
+
+static int __devexit da9052_gpio_remove(struct platform_device *pdev)
+{
+	struct da9052_gpio *gpio = platform_get_drvdata(pdev);
+	int ret;
+
+	ret = gpiochip_remove(&gpio->gp);
+	if (ret == 0)
+		kfree(gpio);
+
+	return ret;
+}
+
+static struct platform_driver da9052_gpio_driver = {
+	.driver.name	= "da9052-gpio",
+	.driver.owner	= THIS_MODULE,
+	.probe			= da9052_gpio_probe,
+	.remove			= __devexit_p(da9052_gpio_remove),
+};
+
+static int __init da9052_gpio_init(void)
+{
+	return platform_driver_register(&da9052_gpio_driver);
+}
+
+static void __exit da9052_gpio_exit(void)
+{
+	return platform_driver_unregister(&da9052_gpio_driver);
+}
+
+module_init(da9052_gpio_init);
+module_exit(da9052_gpio_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da9052-gpio");
diff -Naur orig_linux-2.6.37/drivers/gpio/Kconfig linux-2.6.37/drivers/gpio/Kconfig
--- orig_linux-2.6.37/drivers/gpio/Kconfig	2011-01-05 05:50:19.000000000 +0500
+++ linux-2.6.37/drivers/gpio/Kconfig	2011-03-31 19:53:18.000000000 +0500
@@ -64,7 +64,12 @@
 	  exported to userspace; this can be useful when debugging.

 # put expanders in the right section, in alphabetical order
-
+config GPIO_DA9052
+	bool "Dialog DA9052 GPIO"
+	depends on PMIC_DA9052
+	help
+	  Say Y  to enable the GPIO driver for the DA9052 chip
+
 config GPIO_MAX730X
 	tristate

@@ -401,4 +406,5 @@
 	  This driver provides support for driving the pins in output
 	  mode only. Input mode is not supported.

+
 endif
diff -Naur orig_linux-2.6.37/drivers/gpio/Makefile linux-2.6.37/drivers/gpio/Makefile
--- orig_linux-2.6.37/drivers/gpio/Makefile	2011-01-05 05:50:19.000000000 +0500
+++ linux-2.6.37/drivers/gpio/Makefile	2011-03-31 19:53:12.000000000 +0500
@@ -11,6 +11,7 @@
 obj-$(CONFIG_GPIO_ADP5520)	+= adp5520-gpio.o
 obj-$(CONFIG_GPIO_ADP5588)	+= adp5588-gpio.o
 obj-$(CONFIG_GPIO_BASIC_MMIO)	+= basic_mmio_gpio.o
+obj-$(CONFIG_GPIO_DA9052)	+= da9052-gpio.o
 obj-$(CONFIG_GPIO_LANGWELL)	+= langwell_gpio.o
 obj-$(CONFIG_GPIO_MAX730X)	+= max730x.o
 obj-$(CONFIG_GPIO_MAX7300)	+= max7300.o
diff -Naur orig_linux-2.6.37/include/linux/mfd/da9052/gpio.h linux-2.6.37/include/linux/mfd/da9052/gpio.h
--- orig_linux-2.6.37/include/linux/mfd/da9052/gpio.h	1970-01-01 05:00:00.000000000 +0500
+++ linux-2.6.37/include/linux/mfd/da9052/gpio.h	2011-03-31 19:55:01.000000000 +0500
@@ -0,0 +1,47 @@
+/*
+ * include/linux/mfd/da9052/gpio.h -- GPIO for DA9052
+ *
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * Author: Dajun Chen <dchen@xxxxxxxxxxx>
+ *
+ * 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 program is distributed in the hope that 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef __LINUX_MFD_DA9052_GPIO_H
+#define __LINUX_MFD_DA9052_GPIO_H
+
+#define DA9052_INPUT				1
+#define DA9052_OUTPUT_OPENDRAIN		2
+#define DA9052_OUTPUT_PUSHPULL		3
+
+#define DA9052_SUPPLY_VDD_IO1		0
+
+#define DA9052_DEBOUNCING_OFF		0
+#define DA9052_DEBOUNCING_ON			1
+
+#define DA9052_OUTPUT_LOWLEVEL		0
+
+#define DA9052_ACTIVE_LOW			0
+#define DA9052_ACTIVE_HIGH			1
+
+#define DA9052_GPIO_MAX_PORTS_PER_REGISTER	8
+#define DA9052_GPIO_SHIFT_COUNT(no)		(no%8)
+#define DA9052_GPIO_MASK_UPPER_NIBBLE		0xF0
+#define DA9052_GPIO_MASK_LOWER_NIBBLE		0x0F
+#define DA9052_GPIO_NIBBLE_SHIFT			4
+
+#endif

Regards,
Ashish


èº{.nÇ+‰·Ÿ®‰­†+%ŠËlzwm…ébëæìr¸›zX§»®w¥Š{ayºÊÚë,j­¢f£¢·hš‹àz¹®w¥¢¸¢·¦j:+v‰¨ŠwèjØm¶Ÿÿ¾«‘êçzZ+ƒùšŽŠÝj"ú!¶iO•æ¬z·švØ^¶m§ÿðÃnÆàþY&—