[PATCH] backlight control for Frontpath ProGear HX1050+

[Marcin Juszkiewicz <openembedded@hrw.one.pl>]

From: Marcin Juszkiewicz <openembedded@hrw.one.pl>

Add control of LCD backlight for Frontpath ProGear HX1050+.
Patch is based on http://downloads.sf.net/progear/progear-lcd-0.2.tar.gz
driver by M Schacht.

Signed-Off-By: Marcin Juszkiewicz <openembedded@hrw.one.pl>

---
Patch follow kernel version 2.6.20

 Kconfig      |    8 +++
 Makefile     |    1
 progear_bl.c |  157 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 166 insertions(+)


Index: linux-2.6.20/drivers/video/backlight/Kconfig
===================================================================
--- linux-2.6.20.orig/drivers/video/backlight/Kconfig	2007-02-04 19:44:54.000000000 +0100
+++ linux-2.6.20/drivers/video/backlight/Kconfig	2007-02-05 16:13:13.000000000 +0100
@@ -66,3 +66,11 @@
 	  If you have a HP Jornada 680, say y to enable the
 	  backlight driver.
 
+config BACKLIGHT_PROGEAR
+       tristate "Frontpath ProGear Backlight Driver"
+       depends on BACKLIGHT_DEVICE && PCI
+       default y
+       help
+         If you have a Frontpath ProGear say Y to enable the
+         backlight driver.
+
Index: linux-2.6.20/drivers/video/backlight/progear_bl.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.20/drivers/video/backlight/progear_bl.c	2007-02-05 16:29:14.000000000 +0100
@@ -0,0 +1,157 @@
+/*
+ *  Backlight Driver for Frontpath ProGear HX1050+
+ *
+ *  Copyright (c) 2006 Marcin Juszkiewicz
+ *
+ *  Based on Progear LCD driver by M Schacht
+ *  <mschacht at alumni dot washington dot edu>
+ *
+ *  Based on Sharp's Corgi Backlight Driver
+ *  Based on Backlight Driver for HP Jornada 680
+ *
+ *  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/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/pci.h>
+#include <asm/uaccess.h>
+
+#define PMU_LPCR               0xB0
+#define SB_MPS1                0x61
+#define HW_LEVEL_MAX           0x77
+#define HW_LEVEL_MIN           0x4f
+
+static int progearbl_intensity;
+static struct backlight_properties progearbl_data;
+static struct backlight_device *progear_backlight_device;
+
+static struct pci_dev *pmu_dev = NULL;
+static struct pci_dev *sb_dev = NULL;
+
+static int progearbl_send_intensity(struct backlight_device *bd)
+{
+       int intensity = bd->props->brightness;
+
+       if (bd->props->power != FB_BLANK_UNBLANK)
+               intensity = 0;
+       if (bd->props->fb_blank != FB_BLANK_UNBLANK)
+               intensity = 0;
+
+       pci_write_config_byte(pmu_dev, PMU_LPCR, intensity + HW_LEVEL_MIN);
+
+       progearbl_intensity = intensity;
+
+       return 0;
+}
+
+static int progearbl_get_intensity(struct backlight_device *bd)
+{
+       return progearbl_intensity;
+}
+
+static int progearbl_set_intensity(struct backlight_device *bd)
+{
+       progearbl_send_intensity(progear_backlight_device);
+
+       return 0;
+}
+
+static struct backlight_properties progearbl_data = {
+       .owner = THIS_MODULE,
+       .get_brightness = progearbl_get_intensity,
+       .update_status = progearbl_set_intensity,
+};
+
+static int progearbl_probe(struct platform_device *pdev)
+{
+       u8 temp;
+
+       pmu_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101, 0);
+       if (!pmu_dev) {
+               printk("ALI M7101 PMU not found.\n");
+               return -ENODEV;
+       }
+
+       sb_dev = pci_get_device(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, 0);
+       if (!sb_dev) {
+               printk("ALI 1533 SB not found.\n");
+               pci_dev_put(pmu_dev);
+               return -ENODEV;
+       }
+
+       /*     Set SB_MPS1 to enable brightness control. */
+       pci_read_config_byte(sb_dev, SB_MPS1, &temp);
+       pci_write_config_byte(sb_dev, SB_MPS1, temp | 0x20);
+
+       progear_backlight_device = backlight_device_register("progear-bl",
+			   &pdev->dev, NULL, &progearbl_data);
+       if (IS_ERR(progear_backlight_device))
+               return PTR_ERR(progear_backlight_device);
+
+       progearbl_data.power = FB_BLANK_UNBLANK;
+       progearbl_data.brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
+       progearbl_data.max_brightness = HW_LEVEL_MAX - HW_LEVEL_MIN;
+       progearbl_send_intensity(progear_backlight_device);
+
+       return 0;
+}
+
+static int progearbl_remove(struct platform_device *dev)
+{
+       backlight_device_unregister(progear_backlight_device);
+
+       return 0;
+}
+
+static struct platform_driver progearbl_driver = {
+       .probe = progearbl_probe,
+       .remove = progearbl_remove,
+       .driver = {
+                  .name = "progear-bl",
+                  },
+};
+
+static struct platform_device *progearbl_device;
+
+static int __init progearbl_init(void)
+{
+       int ret = platform_driver_register(&progearbl_driver);
+       if (!ret) {
+               progearbl_device = platform_device_alloc("progear-bl", -1);
+               if (!progearbl_device)
+                       return -ENOMEM;
+
+               ret = platform_device_add(progearbl_device);
+
+               if (ret) {
+                       platform_device_put(progearbl_device);
+                       platform_driver_unregister(&progearbl_driver);
+               }
+       }
+       return ret;
+}
+
+static void __exit progearbl_exit(void)
+{
+       pci_dev_put(pmu_dev);
+       pci_dev_put(sb_dev);
+
+       platform_device_unregister(progearbl_device);
+       platform_driver_unregister(&progearbl_driver);
+}
+
+module_init(progearbl_init);
+module_exit(progearbl_exit);
+
+MODULE_AUTHOR("Marcin Juszkiewicz <linux@hrw.one.pl>");
+MODULE_DESCRIPTION("ProGear Backlight Driver");
+MODULE_LICENSE("GPL");
Index: linux-2.6.20/drivers/video/backlight/Makefile
===================================================================
--- linux-2.6.20.orig/drivers/video/backlight/Makefile	2007-02-04 19:44:54.000000000 +0100
+++ linux-2.6.20/drivers/video/backlight/Makefile	2007-02-05 16:13:13.000000000 +0100
@@ -5,3 +5,4 @@
 obj-$(CONFIG_BACKLIGHT_CORGI)	+= corgi_bl.o
 obj-$(CONFIG_BACKLIGHT_HP680)	+= hp680_bl.o
 obj-$(CONFIG_BACKLIGHT_LOCOMO)	+= locomolcd.o
+obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o


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