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Message-ID: <E2CAE7F7B064EA49B5CE7EE9A4BB167D151B451E62@KCINPUNHJCMS01.kpit.com>
Date: Wed, 6 Apr 2011 17:44:02 +0530
From: Ashish Jangam <Ashish.Jangam@...tcummins.com>
To: Richard Purdie <rpurdie@...ys.net>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Dajun Chen <Dajun.Chen@...semi.com>
Subject: [PATCHv1 9/11] BACKLIGHT: Backlight module for DA9052 PMIC driver
Hi Richard,
Backlight Driver for Dialog Semiconductor DA9052 PMICs.
Changes made since last submission:
. read and write operation moved to MFD
Some additional information of this patch:
. 3 banks of WLEDs on the DA9052 development board was thoroughly tested using a pattern generation script.
Linux Kernel Version: 2.6.37
Signed-off-by: D. Chen <dchen@...semi.com>
---
diff -Naur orig_linux-2.6.37/drivers/video/backlight/da9052_bl.c linux-2.6.37/drivers/video/backlight/da9052_bl.c
--- orig_linux-2.6.37/drivers/video/backlight/da9052_bl.c 1970-01-01 05:00:00.000000000 +0500
+++ linux-2.6.37/drivers/video/backlight/da9052_bl.c 2011-03-31 20:27:51.000000000 +0500
@@ -0,0 +1,215 @@
+/*
+ * da9052_bl.c -- Backlight Driver for Dialog DA9052 PMICs
+ *
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * Author: Dajun Chen <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/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/delay.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+#define DA9052_MAX_BRIGHTNESS 0xFF
+
+enum {
+ DA9052_WLEDS_OFF,
+ DA9052_WLEDS_ON,
+ };
+
+u8 wled_bank[] = {
+ DA9052_LED1_CONF_REG,
+ DA9052_LED2_CONF_REG,
+ DA9052_LED3_CONF_REG,
+ };
+
+struct da9052_bl {
+ struct da9052 *da9052;
+ uint brightness;
+ uint state;
+ uint led_reg;
+ };
+
+static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)
+{
+ u8 boost_en, i_sink;
+ int ret = 0;
+
+ boost_en = 0x3F;
+ i_sink = 0xFF;
+ if (wleds->state == DA9052_WLEDS_OFF) {
+ boost_en = 0x00;
+ i_sink = 0x00;
+ }
+
+ ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);
+ if (ret < 0) {
+ dev_err(wleds->da9052->dev,
+ "Failed to write boost reg, %d\n", ret);
+ return ret;
+ }
+
+ ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink);
+ if (ret < 0) {
+ dev_err(wleds->da9052->dev,
+ "Failed to write led cont reg, %d\n", ret);
+ return ret;
+ }
+
+ ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg],
+ 0x0);
+ if (ret < 0) {
+ dev_err(wleds->da9052->dev,
+ "Failed to write led conf reg, %d", ret);
+ return ret;
+ }
+
+ if (wleds->brightness) {
+ msleep(10);
+ ret = da9052_reg_write(wleds->da9052,
+ wled_bank[wleds->led_reg], wleds->brightness);
+ if (ret < 0)
+ dev_err(wleds->da9052->dev,
+ "Failed to write led conf reg, %d", ret);
+ }
+
+ return ret;
+
+}
+
+static int da9052_backlight_update_status(struct backlight_device *bl)
+{
+ int brightness = bl->props.brightness;
+ struct da9052_bl *wleds = bl_get_data(bl);
+
+ wleds->brightness = brightness;
+ wleds->state = DA9052_WLEDS_ON;
+
+ return da9052_adjust_wled_brightness(wleds);
+}
+
+static int da9052_backlight_get_brightness(struct backlight_device *bl)
+{
+ struct da9052_bl *wleds = bl_get_data(bl);
+ return wleds->brightness;
+}
+
+struct backlight_ops da9052_backlight_ops = {
+ .update_status = da9052_backlight_update_status,
+ .get_brightness = da9052_backlight_get_brightness,
+};
+
+static int da9052_backlight_probe(struct platform_device *pdev)
+{
+ struct backlight_device *bl;
+ struct backlight_properties props;
+ int ret = 0;
+ static int led_reg_num;
+ struct da9052_bl *wleds;
+
+
+ wleds = kzalloc(sizeof(struct da9052_bl), GFP_KERNEL);
+
+ if (!wleds)
+ return -ENOMEM;
+
+ wleds->da9052 = dev_get_drvdata(pdev->dev.parent);
+ wleds->brightness = 0;
+ wleds->led_reg = led_reg_num++;
+ wleds->state = DA9052_WLEDS_OFF;
+
+ bl = backlight_device_register(pdev->name, wleds->da9052->dev,
+ wleds, &da9052_backlight_ops, &props);
+
+ if (IS_ERR(bl)) {
+ dev_err(&pdev->dev, "Failed to register backlight\n");
+ return PTR_ERR(bl);
+ }
+
+ bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
+ bl->props.brightness = 0;
+ platform_set_drvdata(pdev, bl);
+
+ ret = da9052_adjust_wled_brightness(wleds);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int da9052_backlight_remove(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ struct da9052_bl *wleds = bl_get_data(bl);
+
+ wleds->brightness = 0;
+ wleds->state = DA9052_WLEDS_OFF;
+
+ da9052_adjust_wled_brightness(wleds);
+ backlight_device_unregister(bl);
+
+ return 0;
+}
+
+static struct platform_driver da9052_wled1_driver = {
+ .driver.name = "da9052-WLED1",
+ .driver.owner = THIS_MODULE,
+ .probe = da9052_backlight_probe,
+ .remove = da9052_backlight_remove,
+};
+
+static struct platform_driver da9052_wled2_driver = {
+ .driver.name = "da9052-WLED2",
+ .driver.owner = THIS_MODULE,
+ .probe = da9052_backlight_probe,
+ .remove = da9052_backlight_remove,
+};
+static struct platform_driver da9052_wled3_driver = {
+ .driver.name = "da9052-WLED3",
+ .driver.owner = THIS_MODULE,
+ .probe = da9052_backlight_probe,
+ .remove = da9052_backlight_remove,
+};
+
+static int __init da9052_backlight_init(void)
+{
+ s32 ret;
+ ret = platform_driver_register(&da9052_wled1_driver);
+ if (ret)
+ return ret;
+ ret = platform_driver_register(&da9052_wled2_driver);
+ if (ret)
+ return ret;
+
+ ret = platform_driver_register(&da9052_wled3_driver);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+module_init(da9052_backlight_init);
+
+static void __exit da9052_backlight_exit(void)
+{
+ platform_driver_unregister(&da9052_wled1_driver);
+ platform_driver_unregister(&da9052_wled2_driver);
+ platform_driver_unregister(&da9052_wled3_driver);
+}
+module_exit(da9052_backlight_exit);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@...semi.com>");
+MODULE_DESCRIPTION("Backlight driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:da9052-backlight");
+
+
diff -Naur orig_linux-2.6.37/drivers/video/backlight/Kconfig linux-2.6.37/drivers/video/backlight/Kconfig
--- orig_linux-2.6.37/drivers/video/backlight/Kconfig 2011-01-05 05:50:19.000000000 +0500
+++ linux-2.6.37/drivers/video/backlight/Kconfig 2011-03-31 20:27:42.000000000 +0500
@@ -229,6 +229,12 @@
If you have a LCD backlight connected to the WLED output of DA9030
or DA9034 WLED output, say Y here to enable this driver.
+config BACKLIGHT_DA9052
+ tristate "Dialog DA9052 WLED"
+ depends on PMIC_DA9052
+ help
+ Enable the DA9052 Backlight Driver
+
config BACKLIGHT_MAX8925
tristate "Backlight driver for MAX8925"
depends on MFD_MAX8925
diff -Naur orig_linux-2.6.37/drivers/video/backlight/Makefile linux-2.6.37/drivers/video/backlight/Makefile
--- orig_linux-2.6.37/drivers/video/backlight/Makefile 2011-01-05 05:50:19.000000000 +0500
+++ linux-2.6.37/drivers/video/backlight/Makefile 2011-03-31 20:27:37.000000000 +0500
@@ -25,6 +25,7 @@
obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
obj-$(CONFIG_BACKLIGHT_DA903X) += da903x_bl.o
+obj-$(CONFIG_BACKLIGHT_DA9052) += da9052_bl.o
obj-$(CONFIG_BACKLIGHT_MAX8925) += max8925_bl.o
obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o
Regards,
Ashish
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