5 files changed, 596 insertions, 0 deletions

diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index d30fa451e6f..a44ac2e3b8e 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -131,6 +131,8 @@ source "drivers/staging/wlags49_h25/Kconfig"
 
 source "drivers/staging/batman-adv/Kconfig"
 
+source "drivers/staging/samsung-laptop/Kconfig"
+
 source "drivers/staging/strip/Kconfig"
 
 source "drivers/staging/arlan/Kconfig"
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 910e55dd791..069864f4391 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_RAMZSWAP)		+= ramzswap/
 obj-$(CONFIG_WLAGS49_H2)        += wlags49_h2/
 obj-$(CONFIG_WLAGS49_H25)       += wlags49_h25/
 obj-$(CONFIG_BATMAN_ADV)        += batman-adv/
+obj-$(CONFIG_SAMSUNG_LAPTOP)    += samsung-laptop/
 obj-$(CONFIG_STRIP)             += strip/
 obj-$(CONFIG_ARLAN)             += arlan/
 obj-$(CONFIG_WAVELAN)           += wavelan/
diff --git a/drivers/staging/samsung-laptop/Kconfig b/drivers/staging/samsung-laptop/Kconfig
new file mode 100644
index 00000000000..f27c60864c2
--- /dev/null
+++ b/drivers/staging/samsung-laptop/Kconfig
@@ -0,0 +1,10 @@
+config SAMSUNG_LAPTOP
+        tristate "Samsung Laptop driver"
+        default n
+        depends on RFKILL && BACKLIGHT_CLASS_DEVICE && X86
+        help
+          This module implements a driver for the N128 Samsung Laptop
+          providing control over the Wireless LED and the LCD backlight
+
+          To compile this driver as a module, choose
+          M here: the module will be called samsung-laptop.
diff --git a/drivers/staging/samsung-laptop/Makefile b/drivers/staging/samsung-laptop/Makefile
new file mode 100644
index 00000000000..3c6f4204521
--- /dev/null
+++ b/drivers/staging/samsung-laptop/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_SAMSUNG_LAPTOP)    += samsung-laptop.o
diff --git a/drivers/staging/samsung-laptop/samsung-laptop.c b/drivers/staging/samsung-laptop/samsung-laptop.c
new file mode 100644
index 00000000000..253b44754aa
--- /dev/null
+++ b/drivers/staging/samsung-laptop/samsung-laptop.c
@@ -0,0 +1,582 @@
+/*
+ * Samsung N130 Laptop driver
+ *
+ * Copyright (C) 2009 Greg Kroah-Hartman (gregkh@suse.de)
+ * Copyright (C) 2009 Novell Inc.
+ *
+ * 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/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/backlight.h>
+#include <linux/fb.h>
+#include <linux/dmi.h>
+#include <linux/platform_device.h>
+#include <linux/rfkill.h>
+
+/*
+ * This driver is needed because a number of Samsung laptops do not hook
+ * their control settings through ACPI.  So we have to poke around in the
+ * BIOS to do things like brightness values, and "special" key controls.
+ */
+
+/*
+ * We have 0 - 8 as valid brightness levels.  The specs say that level 0 should
+ * be reserved by the BIOS (which really doesn't make much sense), we tell
+ * userspace that the value is 0 - 7 and then just tell the hardware 1 - 8
+ */
+#define MAX_BRIGHT      0x07
+
+/* Brightness is 0 - 8, as described above.  Value 0 is for the BIOS to use */
+#define GET_BRIGHTNESS                  0x00
+#define SET_BRIGHTNESS                  0x01
+
+/* first byte:
+ * 0x00 - wireless is off
+ * 0x01 - wireless is on
+ * second byte:
+ * 0x02 - 3G is off
+ * 0x03 - 3G is on
+ * TODO, verify 3G is correct, that doesn't seem right...
+ */
+#define GET_WIRELESS_BUTTON             0x02
+#define SET_WIRELESS_BUTTON             0x03
+
+/* 0 is off, 1 is on */
+#define GET_BACKLIGHT                   0x04
+#define SET_BACKLIGHT                   0x05
+
+/*
+ * 0x80 or 0x00 - no action
+ * 0x81 - recovery key pressed
+ */
+#define GET_RECOVERY_METHOD             0x06
+#define SET_RECOVERY_METHOD             0x07
+
+/* 0 is low, 1 is high */
+#define GET_PERFORMANCE_LEVEL           0x08
+#define SET_PERFORMANCE_LEVEL           0x09
+
+/*
+ * Tell the BIOS that Linux is running on this machine.
+ * 81 is on, 80 is off
+ */
+#define SET_LINUX                       0x0a
+
+
+#define MAIN_FUNCTION                   0x4c49
+
+#define SABI_HEADER_PORT                0x00
+#define SABI_HEADER_RE_MEM              0x02
+#define SABI_HEADER_IFACEFUNC           0x03
+#define SABI_HEADER_EN_MEM              0x04
+#define SABI_HEADER_DATA_OFFSET         0x05
+#define SABI_HEADER_DATA_SEGMENT        0x07
+
+#define SABI_IFACE_MAIN                 0x00
+#define SABI_IFACE_SUB                  0x02
+#define SABI_IFACE_COMPLETE             0x04
+#define SABI_IFACE_DATA                 0x05
+
+/* Structure to get data back to the calling function */
+struct sabi_retval {
+        u8 retval[20];
+};
+
+static void __iomem *sabi;
+static void __iomem *sabi_iface;
+static void __iomem *f0000_segment;
+static struct backlight_device *backlight_device;
+static struct mutex sabi_mutex;
+static struct platform_device *sdev;
+static struct rfkill *rfk;
+
+static int force;
+module_param(force, bool, 0);
+MODULE_PARM_DESC(force, "Disable the DMI check and forces the driver to be loaded");
+
+static int debug;
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+
+static int sabi_get_command(u8 command, struct sabi_retval *sretval)
+{
+        int retval = 0;
+        u16 port = readw(sabi + SABI_HEADER_PORT);
+
+        mutex_lock(&sabi_mutex);
+
+        /* enable memory to be able to write to it */
+        outb(readb(sabi + SABI_HEADER_EN_MEM), port);
+
+        /* write out the command */
+        writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN);
+        writew(command, sabi_iface + SABI_IFACE_SUB);
+        writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
+        outb(readb(sabi + SABI_HEADER_IFACEFUNC), port);
+
+        /* write protect memory to make it safe */
+        outb(readb(sabi + SABI_HEADER_RE_MEM), port);
+
+        /* see if the command actually succeeded */
+        if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
+            readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
+                /*
+                 * It did!
+                 * Save off the data into a structure so the caller use it.
+                 * Right now we only care about the first 4 bytes,
+                 * I suppose there are commands that need more, but I don't
+                 * know about them.
+                 */
+                sretval->retval[0] = readb(sabi_iface + SABI_IFACE_DATA);
+                sretval->retval[1] = readb(sabi_iface + SABI_IFACE_DATA + 1);
+                sretval->retval[2] = readb(sabi_iface + SABI_IFACE_DATA + 2);
+                sretval->retval[3] = readb(sabi_iface + SABI_IFACE_DATA + 3);
+                goto exit;
+        }
+
+        /* Something bad happened, so report it and error out */
+        printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
+                command, readb(sabi_iface + SABI_IFACE_COMPLETE),
+                readb(sabi_iface + SABI_IFACE_DATA));
+        retval = -EINVAL;
+exit:
+        mutex_unlock(&sabi_mutex);
+        return retval;
+
+}
+
+static int sabi_set_command(u8 command, u8 data)
+{
+        int retval = 0;
+        u16 port = readw(sabi + SABI_HEADER_PORT);
+
+        mutex_lock(&sabi_mutex);
+
+        /* enable memory to be able to write to it */
+        outb(readb(sabi + SABI_HEADER_EN_MEM), port);
+
+        /* write out the command */
+        writew(MAIN_FUNCTION, sabi_iface + SABI_IFACE_MAIN);
+        writew(command, sabi_iface + SABI_IFACE_SUB);
+        writeb(0, sabi_iface + SABI_IFACE_COMPLETE);
+        writeb(data, sabi_iface + SABI_IFACE_DATA);
+        outb(readb(sabi + SABI_HEADER_IFACEFUNC), port);
+
+        /* write protect memory to make it safe */
+        outb(readb(sabi + SABI_HEADER_RE_MEM), port);
+
+        /* see if the command actually succeeded */
+        if (readb(sabi_iface + SABI_IFACE_COMPLETE) == 0xaa &&
+            readb(sabi_iface + SABI_IFACE_DATA) != 0xff) {
+                /* it did! */
+                goto exit;
+        }
+
+        /* Something bad happened, so report it and error out */
+        printk(KERN_WARNING "SABI command 0x%02x failed with completion flag 0x%02x and output 0x%02x\n",
+                command, readb(sabi_iface + SABI_IFACE_COMPLETE),
+                readb(sabi_iface + SABI_IFACE_DATA));
+        retval = -EINVAL;
+exit:
+        mutex_unlock(&sabi_mutex);
+        return retval;
+}
+
+static void test_backlight(void)
+{
+        struct sabi_retval sretval;
+
+        sabi_get_command(GET_BACKLIGHT, &sretval);
+        printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
+
+        sabi_set_command(SET_BACKLIGHT, 0);
+        printk(KERN_DEBUG "backlight should be off\n");
+
+        sabi_get_command(GET_BACKLIGHT, &sretval);
+        printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
+
+        msleep(1000);
+
+        sabi_set_command(SET_BACKLIGHT, 1);
+        printk(KERN_DEBUG "backlight should be on\n");
+
+        sabi_get_command(GET_BACKLIGHT, &sretval);
+        printk(KERN_DEBUG "backlight = 0x%02x\n", sretval.retval[0]);
+}
+
+static void test_wireless(void)
+{
+        struct sabi_retval sretval;
+
+        sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
+        printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
+
+        sabi_set_command(SET_WIRELESS_BUTTON, 0);
+        printk(KERN_DEBUG "wireless led should be off\n");
+
+        sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
+        printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
+
+        msleep(1000);
+
+        sabi_set_command(SET_WIRELESS_BUTTON, 1);
+        printk(KERN_DEBUG "wireless led should be on\n");
+
+        sabi_get_command(GET_WIRELESS_BUTTON, &sretval);
+        printk(KERN_DEBUG "wireless led = 0x%02x\n", sretval.retval[0]);
+}
+
+static u8 read_brightness(void)
+{
+        struct sabi_retval sretval;
+        int user_brightness = 0;
+        int retval;
+
+        retval = sabi_get_command(GET_BRIGHTNESS, &sretval);
+        if (!retval)
+                user_brightness = sretval.retval[0];
+                if (user_brightness != 0)
+                        --user_brightness;
+        return user_brightness;
+}
+
+static void set_brightness(u8 user_brightness)
+{
+        sabi_set_command(SET_BRIGHTNESS, user_brightness + 1);
+}
+
+static int get_brightness(struct backlight_device *bd)
+{
+        return (int)read_brightness();
+}
+
+static int update_status(struct backlight_device *bd)
+{
+        set_brightness(bd->props.brightness);
+
+        if (bd->props.power == FB_BLANK_UNBLANK)
+                sabi_set_command(SET_BACKLIGHT, 1);
+        else
+                sabi_set_command(SET_BACKLIGHT, 0);
+        return 0;
+}
+
+static struct backlight_ops backlight_ops = {
+        .get_brightness = get_brightness,
+        .update_status  = update_status,
+};
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)
+static int rfkill_set(void *data, bool blocked)
+{
+        /* Do something with blocked...*/
+        /*
+         * blocked == false is on
+         * blocked == true is off
+         */
+        if (blocked)
+                sabi_set_command(SET_WIRELESS_BUTTON, 0);
+        else
+                sabi_set_command(SET_WIRELESS_BUTTON, 1);
+
+        return 0;
+}
+
+static struct rfkill_ops rfkill_ops = {
+        .set_block = rfkill_set,
+};
+
+static int init_wireless(struct platform_device *sdev)
+{
+        int retval;
+
+        rfk = rfkill_alloc("samsung-wifi", &sdev->dev, RFKILL_TYPE_WLAN,
+                           &rfkill_ops, NULL);
+        if (!rfk)
+                return -ENOMEM;
+
+        retval = rfkill_register(rfk);
+        if (retval) {
+                rfkill_destroy(rfk);
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void destroy_wireless(void)
+{
+        rfkill_unregister(rfk);
+        rfkill_destroy(rfk);
+}
+
+#else
+
+static int rfkill_set(void *data, enum rfkill_state state)
+{
+        if (state ==  RFKILL_STATE_UNBLOCKED)
+                sabi_set_command(SET_WIRELESS_BUTTON, 1);
+        else
+                sabi_set_command(SET_WIRELESS_BUTTON, 0);
+
+        return 0;
+}
+
+static int init_wireless(struct platform_device *sdev)
+{
+        int retval;
+
+        rfk = rfkill_allocate(&sdev->dev, RFKILL_TYPE_WLAN);
+        if (!rfk)
+                return -ENOMEM;
+        rfk->toggle_radio = rfkill_set;
+        rfk->name = "samsung-wifi";
+
+        retval = rfkill_register(rfk);
+        if (retval) {
+                rfkill_free(rfk);
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void destroy_wireless(void)
+{
+        rfkill_unregister(rfk);
+}
+
+#endif
+
+static ssize_t get_silent_state(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+        struct sabi_retval sretval;
+        int retval;
+
+        /* Read the state */
+        retval = sabi_get_command(GET_PERFORMANCE_LEVEL, &sretval);
+        if (retval)
+                return retval;
+
+        /* The logic is backwards, yeah, lots of fun... */
+        if (sretval.retval[0] == 0)
+                retval = 1;
+        else
+                retval = 0;
+        return sprintf(buf, "%d\n", retval);
+}
+
+static ssize_t set_silent_state(struct device *dev,
+                                struct device_attribute *attr, const char *buf,
+                                size_t count)
+{
+        char value;
+
+        if (count >= 1) {
+                value = buf[0];
+                if ((value == '0') || (value == 'n') || (value == 'N')) {
+                        /* Turn speed up */
+                        sabi_set_command(SET_PERFORMANCE_LEVEL, 0x01);
+                } else if ((value == '1') || (value == 'y') || (value == 'Y')) {
+                        /* Turn speed down */
+                        sabi_set_command(SET_PERFORMANCE_LEVEL, 0x00);
+                } else {
+                        return -EINVAL;
+                }
+        }
+        return count;
+}
+static DEVICE_ATTR(silent, S_IWUGO | S_IRUGO,
+                   get_silent_state, set_silent_state);
+
+
+static int __init dmi_check_cb(const struct dmi_system_id *id)
+{
+        printk(KERN_INFO KBUILD_MODNAME ": found laptop model '%s'\n",
+                id->ident);
+        return 0;
+}
+
+static struct dmi_system_id __initdata samsung_dmi_table[] = {
+        {
+                .ident = "N128",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "N128"),
+                        DMI_MATCH(DMI_BOARD_NAME, "N128"),
+                },
+                .callback = dmi_check_cb,
+        },
+        {
+                .ident = "N130",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
+                        DMI_MATCH(DMI_BOARD_NAME, "N130"),
+                },
+                .callback = dmi_check_cb,
+        },
+        { },
+};
+MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
+
+static int __init samsung_init(void)
+{
+        struct sabi_retval sretval;
+        const char *testStr = "SECLINUX";
+        void __iomem *memcheck;
+        unsigned int ifaceP;
+        int pStr;
+        int loca;
+        int retval;
+
+        mutex_init(&sabi_mutex);
+
+        if (!force && !dmi_check_system(samsung_dmi_table))
+                return -ENODEV;
+
+        f0000_segment = ioremap(0xf0000, 0xffff);
+        if (!f0000_segment) {
+                printk(KERN_ERR "Can't map the segment at 0xf0000\n");
+                return -EINVAL;
+        }
+
+        /* Try to find the signature "SECLINUX" in memory to find the header */
+        pStr = 0;
+        memcheck = f0000_segment;
+        for (loca = 0; loca < 0xffff; loca++) {
+                char temp = readb(memcheck + loca);
+
+                if (temp == testStr[pStr]) {
+                        if (pStr == strlen(testStr)-1)
+                                break;
+                        ++pStr;
+                } else {
+                        pStr = 0;
+                }
+        }
+        if (loca == 0xffff) {
+                printk(KERN_ERR "This computer does not support SABI\n");
+                goto error_no_signature;
+                }
+
+        /* point to the SMI port Number */
+        loca += 1;
+        sabi = (memcheck + loca);
+
+        if (debug) {
+                printk(KERN_DEBUG "This computer supports SABI==%x\n",
+                        loca + 0xf0000 - 6);
+                printk(KERN_DEBUG "SABI header:\n");
+                printk(KERN_DEBUG " SMI Port Number = 0x%04x\n",
+                        readw(sabi + SABI_HEADER_PORT));
+                printk(KERN_DEBUG " SMI Interface Function = 0x%02x\n",
+                        readb(sabi + SABI_HEADER_IFACEFUNC));
+                printk(KERN_DEBUG " SMI enable memory buffer = 0x%02x\n",
+                        readb(sabi + SABI_HEADER_EN_MEM));
+                printk(KERN_DEBUG " SMI restore memory buffer = 0x%02x\n",
+                        readb(sabi + SABI_HEADER_RE_MEM));
+                printk(KERN_DEBUG " SABI data offset = 0x%04x\n",
+                        readw(sabi + SABI_HEADER_DATA_OFFSET));
+                printk(KERN_DEBUG " SABI data segment = 0x%04x\n",
+                        readw(sabi + SABI_HEADER_DATA_SEGMENT));
+        }
+
+        /* Get a pointer to the SABI Interface */
+        ifaceP = (readw(sabi + SABI_HEADER_DATA_SEGMENT) & 0x0ffff) << 4;
+        ifaceP += readw(sabi + SABI_HEADER_DATA_OFFSET) & 0x0ffff;
+        sabi_iface = ioremap(ifaceP, 16);
+        if (!sabi_iface) {
+                printk(KERN_ERR "Can't remap %x\n", ifaceP);
+                goto exit;
+        }
+        if (debug) {
+                printk(KERN_DEBUG "ifaceP = 0x%08x\n", ifaceP);
+                printk(KERN_DEBUG "sabi_iface = %p\n", sabi_iface);
+
+                test_backlight();
+                test_wireless();
+
+                retval = sabi_get_command(GET_BRIGHTNESS, &sretval);
+                printk(KERN_DEBUG "brightness = 0x%02x\n", sretval.retval[0]);
+        }
+
+        /* Turn on "Linux" mode in the BIOS */
+        retval = sabi_set_command(SET_LINUX, 0x81);
+        if (retval) {
+                printk(KERN_ERR KBUILD_MODNAME ": Linux mode was not set!\n");
+                goto error_no_platform;
+        }
+
+        /* knock up a platform device to hang stuff off of */
+        sdev = platform_device_register_simple("samsung", -1, NULL, 0);
+        if (IS_ERR(sdev))
+                goto error_no_platform;
+
+        /* create a backlight device to talk to this one */
+        backlight_device = backlight_device_register("samsung", &sdev->dev,
+                                                     NULL, &backlight_ops);
+        if (IS_ERR(backlight_device))
+                goto error_no_backlight;
+
+        backlight_device->props.max_brightness = MAX_BRIGHT;
+        backlight_device->props.brightness = read_brightness();
+        backlight_device->props.power = FB_BLANK_UNBLANK;
+        backlight_update_status(backlight_device);
+
+        retval = init_wireless(sdev);
+        if (retval)
+                goto error_no_rfk;
+
+        retval = device_create_file(&sdev->dev, &dev_attr_silent);
+        if (retval)
+                goto error_file_create;
+
+exit:
+        return 0;
+
+error_file_create:
+        destroy_wireless();
+
+error_no_rfk:
+        backlight_device_unregister(backlight_device);
+
+error_no_backlight:
+        platform_device_unregister(sdev);
+
+error_no_platform:
+        iounmap(sabi_iface);
+
+error_no_signature:
+        iounmap(f0000_segment);
+        return -EINVAL;
+}
+
+static void __exit samsung_exit(void)
+{
+        /* Turn off "Linux" mode in the BIOS */
+        sabi_set_command(SET_LINUX, 0x80);
+
+        device_remove_file(&sdev->dev, &dev_attr_silent);
+        backlight_device_unregister(backlight_device);
+        destroy_wireless();
+        iounmap(sabi_iface);
+        iounmap(f0000_segment);
+        platform_device_unregister(sdev);
+}
+
+module_init(samsung_init);
+module_exit(samsung_exit);
+
+MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
+MODULE_DESCRIPTION("Samsung Backlight driver");
+MODULE_LICENSE("GPL");