[PATCH] backlight: Add backlight driver for Bachmann's ot200

[Christian Gmeiner <christian.gmeiner@gmail.com>]

>From 27574197e9f8425c6aeadffef199c8b7eb969233 Mon Sep 17 00:00:00 2001
From: Christian Gmeiner <christian.gmeiner@gmail.com>
Date: Fri, 13 Jan 2012 15:31:01 +0100
Subject: [PATCH] backlight: Add backlight driver for Bachmann's ot200

Add backlight driver for Bachmann's ot200 visualisation device. The
driver uses MFGPT 7 of CS5535 silicon to regulate the backlight.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
---
 drivers/video/backlight/Kconfig    |    9 ++
 drivers/video/backlight/Makefile   |    2 +-
 drivers/video/backlight/ot200_bl.c |  167 ++++++++++++++++++++++++++++++++++++
 3 files changed, 177 insertions(+), 1 deletions(-)
 create mode 100644 drivers/video/backlight/ot200_bl.c

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 278aeaa..ab02544 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -342,6 +342,15 @@ config BACKLIGHT_AAT2870
 	  If you have a AnalogicTech AAT2870 say Y to enable the
 	  backlight driver.
 
+config BACKLIGHT_OT200
+	tristate "Backlight Driver for Bachmann's OT200"
+	depends on BACKLIGHT_CLASS_DEVICE
+	select MFD_CS5535
+	select CS5535_MFGPT
+	help
+	  To compile this driver as a module, choose M here: the module will be
+	  called ot200_bl.
+
 endif # BACKLIGHT_CLASS_DEVICE
 
 endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index fdd1fc4..4f07d3f 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -39,4 +39,4 @@ obj-$(CONFIG_BACKLIGHT_ADP8870)	+= adp8870_bl.o
 obj-$(CONFIG_BACKLIGHT_88PM860X) += 88pm860x_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
 obj-$(CONFIG_BACKLIGHT_AAT2870) += aat2870_bl.o
-
+obj-$(CONFIG_BACKLIGHT_OT200) += ot200_bl.o
diff --git a/drivers/video/backlight/ot200_bl.c b/drivers/video/backlight/ot200_bl.c
new file mode 100644
index 0000000..d8e8ba1
--- /dev/null
+++ b/drivers/video/backlight/ot200_bl.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (C) 2012 Bachmann electronic GmbH
+ *	Christian Gmeiner <christian.gmeiner@gmail.com>
+ *
+ * Backlight driver for Bachmann's ot200.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/gpio.h>
+#include <linux/cs5535.h>
+
+static struct cs5535_mfgpt_timer *pwm_timer;
+static const  u8 DIM_TABLE[101] = {0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2,
+				   2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4,
+				   4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 9, 9,
+				   10, 10, 11, 11, 12, 12, 13, 14, 15, 15, 16,
+				   17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28,
+				   30, 31, 33, 35, 37, 39, 41, 43, 45, 47, 50,
+				   53, 55, 58, 61, 65, 68, 72, 75, 79, 84, 88,
+				   93, 97, 103, 108, 114, 120, 126, 133, 140,
+				   147, 155, 163};
+
+struct ot200_backlight_data {
+	int current_brightness;
+};
+
+#define GPIO_DIMM	27
+
+static int ot200_backlight_update_status(struct backlight_device *bl)
+{
+	struct ot200_backlight_data *data = bl_get_data(bl);
+	int brightness = bl->props.brightness;
+
+	if (bl->props.state & BL_CORE_FBBLANK)
+		brightness = 0;
+
+	/* enable or disable PWM timer */
+	if (brightness == 0)
+		cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, 0);
+	else if (brightness != 0 && data->current_brightness == 0) {
+		cs5535_mfgpt_write(pwm_timer, MFGPT_REG_COUNTER, 0);
+		cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, 0x8281);
+	}
+
+	/* apply new brightness value */
+	cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP1,
+					163 - DIM_TABLE[brightness]);
+	data->current_brightness = brightness;
+
+	return 0;
+}
+
+static int ot200_backlight_get_brightness(struct backlight_device *bl)
+{
+	struct ot200_backlight_data *data = bl_get_data(bl);
+	return data->current_brightness;
+}
+
+static const struct backlight_ops ot200_backlight_ops = {
+	.update_status	= ot200_backlight_update_status,
+	.get_brightness	= ot200_backlight_get_brightness,
+};
+
+static int ot200_backlight_probe(struct platform_device *pdev)
+{
+	struct backlight_device *bl;
+	struct ot200_backlight_data *data;
+	struct backlight_properties props;
+	int retval = 0;
+
+	/* request gpio */
+	if (gpio_request(GPIO_DIMM, "ot200 backlight dimmer") < 0) {
+		printk(KERN_ERR "ot200 backlight: failed to request GPIO %d\n",
+				GPIO_DIMM);
+		return -ENODEV;
+	}
+
+	/* request timer */
+	pwm_timer = cs5535_mfgpt_alloc_timer(7, MFGPT_DOMAIN_ANY);
+	if (!pwm_timer) {
+		printk(KERN_ERR "ot200 backlight: MFGPT 7 not available\n");
+		retval = -ENODEV;
+		goto error_mfgpt_alloc;
+	}
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL) {
+		retval = -ENOMEM;
+		goto error_kzalloc;
+	}
+
+	/* setup gpio */
+	cs5535_gpio_set(GPIO_DIMM, GPIO_OUTPUT_ENABLE);
+	cs5535_gpio_set(GPIO_DIMM, GPIO_OUTPUT_AUX1);
+
+	/* setup timer */
+	cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP1, 0);
+	cs5535_mfgpt_write(pwm_timer, MFGPT_REG_CMP2, 0xa3);
+	cs5535_mfgpt_write(pwm_timer, MFGPT_REG_SETUP, 0x8281);
+
+	data->current_brightness = 100;
+	props.max_brightness = 100;
+	props.brightness = 100;
+	props.type = BACKLIGHT_RAW;
+
+	bl = backlight_device_register("ipc", &pdev->dev, data,
+					&ot200_backlight_ops, &props);
+	if (IS_ERR(bl)) {
+		dev_err(&pdev->dev, "failed to register backlight\n");
+		retval = PTR_ERR(bl);
+		goto error_backlight_device_register;
+	}
+
+	platform_set_drvdata(pdev, bl);
+
+	return 0;
+
+error_backlight_device_register:
+	kfree(data);
+error_kzalloc:
+	cs5535_mfgpt_free_timer(pwm_timer);
+error_mfgpt_alloc:
+	gpio_free(GPIO_DIMM);
+	return retval;
+}
+
+static int ot200_backlight_remove(struct platform_device *pdev)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+	struct ot200_backlight_data *data = bl_get_data(bl);
+
+	backlight_device_unregister(bl);
+	kfree(data);
+	return 0;
+}
+
+static struct platform_driver ot200_backlight_driver = {
+	.driver		= {
+		.name	= "ot200-backlight",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= ot200_backlight_probe,
+	.remove		= ot200_backlight_remove,
+};
+
+static int __init ot200_backlight_init(void)
+{
+	return platform_driver_register(&ot200_backlight_driver);
+}
+module_init(ot200_backlight_init);
+
+static void __exit ot200_backlight_exit(void)
+{
+	platform_driver_unregister(&ot200_backlight_driver);
+}
+module_exit(ot200_backlight_exit);
+
+MODULE_DESCRIPTION("backlight driver for Bachmann ot200");
+MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@gmail.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ot200-backlight");
-- 
1.7.5.4