Message-ID: <AANLkTim=MPhwuc4M3SKOJEckJuJ15=ojq8kMEfBaGyOc@mail.gmail.com>
Date:	Tue, 21 Dec 2010 18:56:00 +0100
From:	dd diasemi <dd.diasemi@...il.com>
To:	rpurdie@...ys.net
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCHv2 10/11] LEDS: LED module of DA9052 device driver

LED module for DA9052 PMIC device from Dialog Semiconductor.

Changes made since last submission:
. early invocation of SSC lock
. deffered invocation of the function da9052_leds_prepare()

Linux Kernel Version: 2.6.34

Signed-off-by: D. Chen <dchen@...semi.com>
---
diff -urpN linux-2.6.34/drivers/leds/Kconfig
linux-2.6.34_test/drivers/leds/Kconfig
--- linux-2.6.34/drivers/leds/Kconfig	2010-05-17 02:17:36.000000000 +0500
+++ linux-2.6.34_test/drivers/leds/Kconfig	2010-07-01 18:16:37.000000000 +0500
@@ -225,6 +225,13 @@ config LEDS_DA903X
 	  This option enables support for on-chip LED drivers found
 	  on Dialog Semiconductor DA9030/DA9034 PMICs.

+config LEDS_DA9052
+	tristate "Dialog DA9052 LEDS"
+	depends on PMIC_DA9052
+	help
+	  This option enables support for on-chip LED drivers found
+	  on Dialog Semiconductor DA9052 PMICs.
+
 config LEDS_DAC124S085
 	tristate "LED Support for DAC124S085 SPI DAC"
 	depends on SPI
diff -Naur linux-2.6.34-orig2/drivers/leds/leds-da9052.c
linux-2.6.34/drivers/leds/leds-da9052.c
--- linux-2.6.34-orig2/drivers/leds/leds-da9052.c	1970-01-01
05:00:00.000000000 +0500
+++ linux-2.6.34/drivers/leds/leds-da9052.c	2010-10-13 09:20:26.000000000 +0500
@@ -0,0 +1,306 @@
+/*
+ * leds-da9052.c  --  LED Driver for Dialog DA9052
+ *
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * Author: Dialog Semiconductor Ltd <dchen@...semi.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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/led.h>
+
+#define DRIVER_NAME		"da9052-leds"
+
+#define DA9052_LED4_PRESENT	1
+#define DA9052_LED5_PRESENT	1
+
+
+struct da9052_led_data {
+	struct led_classdev cdev;
+	struct work_struct work;
+	struct da9052 *da9052;
+	int id;
+	int new_brightness;
+	int is_led4_present;
+	int is_led5_present;
+};
+
+#define GPIO14_PIN		2 /* GPO Open Drain */
+#define GPIO14_TYPE		0 /* VDD_IO1 */
+#define GPIO14_MODE		1 /* Output High */
+
+#define GPIO15_PIN		2 /* GPO Open Drain */
+#define GPIO15_TYPE		0 /* VDD_IO1 */
+#define GPIO15_MODE		1 /* Output High */
+
+#define MAXIMUM_PWM		95
+#define MASK_GPIO14		0x0F
+#define MASK_GPIO15		0xF0
+#define GPIO15_PIN_BIT_POSITION	4
+
+static void da9052_led_work(struct work_struct *work)
+{
+	struct da9052_led_data *led = container_of(work,
+				 struct da9052_led_data, work);
+	int reg = 0;
+	int led_dim_bit = 0;
+	struct da9052_ssc_msg msg;
+	int ret = 0;
+
+	switch (led->id) {
+	case DA9052_LED_4:
+		reg = DA9052_LED4CONT_REG;
+		led_dim_bit = DA9052_LED4CONT_LED4DIM;
+	break;
+	case DA9052_LED_5:
+		reg = DA9052_LED5CONT_REG;
+		led_dim_bit = DA9052_LED5CONT_LED5DIM;
+	break;
+	}
+
+	if (led->new_brightness > MAXIMUM_PWM)
+		led->new_brightness = MAXIMUM_PWM;
+
+	/* Always enable DIM feature
+	 * This feature can be disabled if required
+	 */
+	msg.addr = reg;
+	msg.data = led->new_brightness | led_dim_bit;
+	da9052_lock(led->da9052);
+	ret = led->da9052->write(led->da9052, &msg);
+	if (ret) {
+		da9052_unlock(led->da9052);
+		return;
+	}
+	da9052_unlock(led->da9052);
+}
+
+static void da9052_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct da9052_led_data *led;
+
+	led = container_of(led_cdev, struct da9052_led_data, cdev);
+	led->new_brightness = value;
+	schedule_work(&led->work);
+}
+
+static int __devinit da9052_led_setup(struct da9052_led_data *led)
+{
+	int reg = 0;
+	int ret = 0;
+
+	struct da9052_ssc_msg msg;
+
+	switch (led->id) {
+	case DA9052_LED_4:
+		reg = DA9052_LED4CONT_REG;
+	break;
+	case DA9052_LED_5:
+		reg = DA9052_LED5CONT_REG;
+	break;
+	}
+
+	msg.addr = reg;
+	msg.data = 0;
+
+	da9052_lock(led->da9052);
+	ret = led->da9052->write(led->da9052, &msg);
+	if (ret) {
+		da9052_unlock(led->da9052);
+		return ret;
+	}
+	da9052_unlock(led->da9052);
+	return ret;
+}
+
+static int da9052_leds_prepare(struct da9052_led_data *led)
+{
+	int ret = 0;
+	struct da9052_ssc_msg msg;
+
+	da9052_lock(led->da9052);
+
+	if (1 == led->is_led4_present) {
+		msg.addr = DA9052_GPIO1415_REG;
+		msg.data = 0;
+
+		ret = led->da9052->read(led->da9052, &msg);
+		if (ret)
+			goto out;
+		msg.data = msg.data & ~(MASK_GPIO14);
+		msg.data = msg.data | (
+				GPIO14_PIN |
+				(GPIO14_TYPE ? DA9052_GPIO1415_GPIO14TYPE : 0) |
+				(GPIO14_MODE ? DA9052_GPIO1415_GPIO14MODE : 0));
+
+		ret = led->da9052->write(led->da9052, &msg);
+		if (ret)
+			goto out;
+	}
+
+	if (1 == led->is_led5_present) {
+		msg.addr = DA9052_GPIO1415_REG;
+		msg.data = 0;
+
+		ret = led->da9052->read(led->da9052, &msg);
+		if (ret)
+			goto out;
+		msg.data = msg.data & ~(MASK_GPIO15);
+		msg.data = msg.data |
+			(((GPIO15_PIN << GPIO15_PIN_BIT_POSITION) |
+				(GPIO15_TYPE ? DA9052_GPIO1415_GPIO15TYPE : 0) |
+				(GPIO15_MODE ? DA9052_GPIO1415_GPIO15MODE : 0))
+				);
+		ret = led->da9052->write(led->da9052, &msg);
+		if (ret)
+			goto out;
+	}
+
+	da9052_unlock(led->da9052);
+	return ret;
+out:
+	da9052_unlock(led->da9052);
+	return ret;
+}
+
+static int __devinit da9052_led_probe(struct platform_device *pdev)
+{
+	struct da9052_leds_platform_data *pdata = (pdev->dev.platform_data);
+	struct da9052_led_platform_data *led_cur;
+	struct da9052_led_data *led, *led_dat;
+	int ret, i;
+	int init_led = 0;
+
+	if (pdata->num_leds < 1 || pdata->num_leds > DA9052_LED_MAX) {
+		dev_err(&pdev->dev, "Invalid led count %d\n", pdata->num_leds);
+		return -EINVAL;
+	}
+
+	led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);
+	if (led == NULL) {
+		dev_err(&pdev->dev, "failed to alloc memory\n");
+		return -ENOMEM;
+	}
+
+	led->is_led4_present = DA9052_LED4_PRESENT;
+	led->is_led5_present = DA9052_LED5_PRESENT;
+
+	for (i = 0; i < pdata->num_leds; i++) {
+		led_dat = &led[i];
+		led_cur = &pdata->led[i];
+		if (led_cur->id < 0) {
+			dev_err(&pdev->dev, "invalid id %d\n", led_cur->id);
+			ret = -EINVAL;
+			goto err_register;
+		}
+
+		if (init_led & (1 << led_cur->id)) {
+			dev_err(&pdev->dev, "led %d already initialized\n",
+					led_cur->id);
+			ret = -EINVAL;
+			goto err_register;
+		}
+
+		init_led |= 1 << led_cur->id;
+
+		led_dat->cdev.name = led_cur->name;
+		led_dat->cdev.brightness_set = da9052_led_set;
+		led_dat->cdev.brightness = LED_OFF;
+		led_dat->id = led_cur->id;
+		led_dat->da9052 = dev_get_drvdata(pdev->dev.parent);
+
+		INIT_WORK(&led_dat->work, da9052_led_work);
+
+		ret = led_classdev_register(pdev->dev.parent, &led_dat->cdev);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to register led %d\n",
+					led_dat->id);
+			goto err_register;
+
+		}
+		ret = da9052_led_setup(led_dat);
+		if (ret) {
+			dev_err(&pdev->dev, "unable to init led %d\n",
+					led_dat->id);
+			i++;
+			goto err_register;
+		}
+	}
+	ret = da9052_leds_prepare(led);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to init led driver\n");
+		goto err_free;
+	}
+
+	platform_set_drvdata(pdev, led);
+	return 0;
+
+err_register:
+	for (i = i - 1; i >= 0; i--) {
+		led_classdev_unregister(&led[i].cdev);
+		cancel_work_sync(&led[i].work);
+	}
+
+err_free:
+	kfree(led);
+	return ret;
+}
+
+static int __devexit da9052_led_remove(struct platform_device *pdev)
+{
+	struct da9052_leds_platform_data *pdata =
+		(struct da9052_leds_platform_data *)pdev->dev.platform_data;
+	struct da9052_led_data *led = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < pdata->num_leds; i++) {
+		da9052_led_setup(&led[i]);
+		led_classdev_unregister(&led[i].cdev);
+		cancel_work_sync(&led[i].work);
+	}
+
+	kfree(led);
+	return 0;
+}
+
+static struct platform_driver da9052_led_driver = {
+	.driver	= {
+		.name	= DRIVER_NAME,
+		.owner	= THIS_MODULE,
+	},
+	.probe		= da9052_led_probe,
+	.remove		= __devexit_p(da9052_led_remove),
+};
+
+static int __init da9052_led_init(void)
+{
+	return platform_driver_register(&da9052_led_driver);
+}
+module_init(da9052_led_init);
+
+static void __exit da9052_led_exit(void)
+{
+	platform_driver_unregister(&da9052_led_driver);
+}
+module_exit(da9052_led_exit);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@...semi.com>	");
+MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DRIVER_NAME);
diff -Naur linux-2.6.34-orig2/drivers/leds/Makefile
linux-2.6.34/drivers/leds/Makefile
--- linux-2.6.34-orig2/drivers/leds/Makefile	2010-10-13 09:32:50.000000000 +0500
+++ linux-2.6.34/drivers/leds/Makefile	2010-10-13 10:06:18.000000000 +0500
@@ -27,6 +27,7 @@
 obj-$(CONFIG_LEDS_FSG)			+= leds-fsg.o
 obj-$(CONFIG_LEDS_PCA955X)		+= leds-pca955x.o
 obj-$(CONFIG_LEDS_DA903X)		+= leds-da903x.o
+obj-$(CONFIG_LEDS_DA9052)		+= leds-da9052.o
 obj-$(CONFIG_LEDS_WM831X_STATUS)	+= leds-wm831x-status.o
 obj-$(CONFIG_LEDS_WM8350)		+= leds-wm8350.o
 obj-$(CONFIG_LEDS_PWM)			+= leds-pwm.o
diff -Naur linux-2.6.34-orig2/include/linux/mfd/da9052/led.h
linux-2.6.34/include/linux/mfd/da9052/led.h
--- linux-2.6.34-orig2/include/linux/mfd/da9052/led.h	1970-01-01
05:00:00.000000000 +0500
+++ linux-2.6.34/include/linux/mfd/da9052/led.h	2010-10-12
09:55:03.000000000 +0500
@@ -0,0 +1,39 @@
+/*
+ * da9052 LED module declarations.
+ *
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * 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_LED_H
+#define __LINUX_MFD_DA9052_LED_H
+
+struct da9052_led_platform_data {
+#define DA9052_LED_4			4
+#define DA9052_LED_5			5
+#define DA9052_LED_MAX			2
+	int id;
+	const char *name;
+	const char *default_trigger;
+};
+
+struct da9052_leds_platform_data {
+	int num_leds;
+	struct da9052_led_platform_data *led;
+};
+
+#endif /* __LINUX_MFD_DA9052_LED_H */
--
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