backlight: Add Frontpath ProGear HX1050+ driver

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>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

1 files changed, 154 insertions, 0 deletions

diff --git a/drivers/video/backlight/progear_bl.c b/drivers/video/backlight/progear_bl.c
new file mode 100644
index 000000000000..13d831da8d96
--- /dev/null
+++ b/drivers/video/backlight/progear_bl.c
@@ -0,0 +1,154 @@
+/*
+ *  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 struct pci_dev *pmu_dev = NULL;
+static struct pci_dev *sb_dev = NULL;
+
+static int progearbl_set_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);
+
+        return 0;
+}
+
+static int progearbl_get_intensity(struct backlight_device *bd)
+{
+        u8 intensity;
+        pci_read_config_byte(pmu_dev, PMU_LPCR, &intensity);
+
+        return intensity - HW_LEVEL_MIN;
+}
+
+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;
+        struct backlight_device *progear_backlight_device;
+
+        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);
+
+        platform_set_drvdata(pdev, 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_set_intensity(progear_backlight_device);
+
+        return 0;
+}
+
+static int progearbl_remove(struct platform_device *pdev)
+{
+        struct backlight_device *bd = platform_get_drvdata(pdev);
+        backlight_device_unregister(bd);
+
+        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");