backlight: Add driver for Tabletkiosk Sahara TouchIT-213 Tablet PC

[akpm@linux-foundation.org: coding-style fixes]
[rpurdie@linux.intel.com: minor tweaks]
Signed-off-by: Claudio Nieder <private@claudio.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 5ff97250aa127b0291cdf97bfbaac86b264f542d..51c94a5971b4e9e7401835126e47b404879f75c4 100644 (file)
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -204,3 +204,10 @@ config BACKLIGHT_TOSA
          If you have an Sharp SL-6000 Zaurus say Y to enable a driver
          for its backlight
 
+config BACKLIGHT_SAHARA
+       tristate "Tabletkiosk Sahara Touch-iT Backlight Driver"
+       depends on BACKLIGHT_CLASS_DEVICE && X86
+       default n
+       help
+         If you have a Tabletkiosk Sahara Touch-iT, say y to enable the
+         backlight driver.

diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 9c818231f1fba018f5e820d423dc6dc06c798fe1..103427de670357f4f974fd598b37ee41cd5f6ef2 100644 (file)
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -21,5 +21,5 @@ obj-$(CONFIG_BACKLIGHT_PWM)   += pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_DA903X) += da903x.o
 obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
 obj-$(CONFIG_BACKLIGHT_TOSA)   += tosa_bl.o
-
+obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o
 

diff --git a/drivers/video/backlight/kb3886_bl.c b/drivers/video/backlight/kb3886_bl.c
new file mode 100644 (file)
index 0000000..a38fda1
--- /dev/null
+++ b/drivers/video/backlight/kb3886_bl.c
@@ -0,0 +1,204 @@
+/*
+ *  Backlight Driver for the KB3886 Backlight
+ *
+ *  Copyright (c) 2007-2008 Claudio Nieder
+ *
+ *  Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle
+ *
+ *  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/delay.h>
+#include <linux/dmi.h>
+
+#define KB3886_PARENT 0x64
+#define KB3886_IO 0x60
+#define KB3886_ADC_DAC_PWM 0xC4
+#define KB3886_PWM0_WRITE 0x81
+#define KB3886_PWM0_READ 0x41
+
+static DEFINE_MUTEX(bl_mutex);
+
+static void kb3886_bl_set_intensity(int intensity)
+{
+       mutex_lock(&bl_mutex);
+       intensity = intensity&0xff;
+       outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);
+       msleep(10);
+       outb(KB3886_PWM0_WRITE, KB3886_IO);
+       msleep(10);
+       outb(intensity, KB3886_IO);
+       mutex_unlock(&bl_mutex);
+}
+
+struct kb3886bl_machinfo {
+       int max_intensity;
+       int default_intensity;
+       int limit_mask;
+       void (*set_bl_intensity)(int intensity);
+};
+
+static struct kb3886bl_machinfo kb3886_bl_machinfo = {
+       .max_intensity = 0xff,
+       .default_intensity = 0xa0,
+       .limit_mask = 0x7f,
+       .set_bl_intensity = kb3886_bl_set_intensity,
+};
+
+static struct platform_device kb3886bl_device = {
+       .name           = "kb3886-bl",
+       .dev            = {
+               .platform_data  = &kb3886_bl_machinfo,
+       },
+       .id             = -1,
+};
+
+static struct platform_device *devices[] __initdata = {
+       &kb3886bl_device,
+};
+
+/*
+ * Back to driver
+ */
+
+static int kb3886bl_intensity;
+static struct backlight_device *kb3886_backlight_device;
+static struct kb3886bl_machinfo *bl_machinfo;
+
+static unsigned long kb3886bl_flags;
+#define KB3886BL_SUSPENDED     0x01
+
+static struct dmi_system_id __initdata kb3886bl_device_table[] = {
+       {
+               .ident = "Sahara Touch-iT",
+               .matches = {
+                       DMI_MATCH(DMI_SYS_VENDOR, "SDV"),
+                       DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"),
+               },
+       },
+       { }
+};
+
+static int kb3886bl_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;
+       if (kb3886bl_flags & KB3886BL_SUSPENDED)
+               intensity = 0;
+
+       bl_machinfo->set_bl_intensity(intensity);
+
+       kb3886bl_intensity = intensity;
+       return 0;
+}
+
+#ifdef CONFIG_PM
+static int kb3886bl_suspend(struct platform_device *pdev, pm_message_t state)
+{
+       struct backlight_device *bd = platform_get_drvdata(pdev);
+
+       kb3886bl_flags |= KB3886BL_SUSPENDED;
+       backlight_update_status(bd);
+       return 0;
+}
+
+static int kb3886bl_resume(struct platform_device *pdev)
+{
+       struct backlight_device *bd = platform_get_drvdata(pdev);
+
+       kb3886bl_flags &= ~KB3886BL_SUSPENDED;
+       backlight_update_status(bd);
+       return 0;
+}
+#else
+#define kb3886bl_suspend       NULL
+#define kb3886bl_resume                NULL
+#endif
+
+static int kb3886bl_get_intensity(struct backlight_device *bd)
+{
+       return kb3886bl_intensity;
+}
+
+static struct backlight_ops kb3886bl_ops = {
+       .get_brightness = kb3886bl_get_intensity,
+       .update_status  = kb3886bl_send_intensity,
+};
+
+static int kb3886bl_probe(struct platform_device *pdev)
+{
+       struct kb3886bl_machinfo *machinfo = pdev->dev.platform_data;
+
+       bl_machinfo = machinfo;
+       if (!machinfo->limit_mask)
+               machinfo->limit_mask = -1;
+
+       kb3886_backlight_device = backlight_device_register("kb3886-bl",
+               &pdev->dev, NULL, &kb3886bl_ops);
+       if (IS_ERR(kb3886_backlight_device))
+               return PTR_ERR(kb3886_backlight_device);
+
+       platform_set_drvdata(pdev, kb3886_backlight_device);
+
+       kb3886_backlight_device->props.max_brightness = machinfo->max_intensity;
+       kb3886_backlight_device->props.power = FB_BLANK_UNBLANK;
+       kb3886_backlight_device->props.brightness = machinfo->default_intensity;
+       backlight_update_status(kb3886_backlight_device);
+
+       return 0;
+}
+
+static int kb3886bl_remove(struct platform_device *pdev)
+{
+       struct backlight_device *bd = platform_get_drvdata(pdev);
+
+       backlight_device_unregister(bd);
+
+       return 0;
+}
+
+static struct platform_driver kb3886bl_driver = {
+       .probe          = kb3886bl_probe,
+       .remove         = kb3886bl_remove,
+       .suspend        = kb3886bl_suspend,
+       .resume         = kb3886bl_resume,
+       .driver         = {
+               .name   = "kb3886-bl",
+       },
+};
+
+static int __init kb3886_init(void)
+{
+       if (!dmi_check_system(kb3886bl_device_table))
+               return -ENODEV;
+
+       platform_add_devices(devices, ARRAY_SIZE(devices));
+       return platform_driver_register(&kb3886bl_driver);
+}
+
+static void __exit kb3886_exit(void)
+{
+       platform_driver_unregister(&kb3886bl_driver);
+}
+
+module_init(kb3886_init);
+module_exit(kb3886_exit);
+
+MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
+MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*");