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>
diff --git a/drivers/video/backlight/progear_bl.c b/drivers/video/backlight/progear_bl.c
new file mode 100644
index 0000000..13d831d
--- /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");