ACPI: asus_acpi: LED display support

This patch adds handling for front LED displays found on W1N and the like.
Additionally, W1N is given its own model_data instance.

Patch originally by Éric Burghard.

Signed-off-by: Karol Kozimor <sziwan@hell.org.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 63 insertions, 6 deletions

diff --git a/drivers/acpi/asus_acpi.c b/drivers/acpi/asus_acpi.c
index fdc3995b8911..b95b52e2932c 100644
--- a/drivers/acpi/asus_acpi.c
+++ b/drivers/acpi/asus_acpi.c
@@ -26,6 +26,7 @@
  *  Pontus Fuchs   - Helper functions, cleanup
  *  Johann Wiesner - Small compile fixes
  *  John Belmonte  - ACPI code for Toshiba laptop was a good starting point.
+ *  Éric Burghard  - LED display support for W1N
  *
  */
 
@@ -44,6 +45,7 @@
 #define PROC_MLED       "mled"
 #define PROC_WLED       "wled"
 #define PROC_TLED       "tled"
+#define PROC_LEDD       "ledd"
 #define PROC_INFO       "info"
 #define PROC_LCD        "lcd"
 #define PROC_BRN        "brn"
@@ -88,6 +90,7 @@ struct model_data {
         char *wled_status;      //node to handle wled reading_______A
         char *mt_tled;          //method to handle tled_____________R
         char *tled_status;      //node to handle tled reading_______A
+        char *mt_ledd;          //method to handle LED display______R
         char *mt_lcd_switch;    //method to turn LCD ON/OFF_________A
         char *lcd_status;       //node to read LCD panel state______A
         char *brightness_up;    //method to set brightness up_______A
@@ -107,6 +110,7 @@ struct asus_hotk {
         struct acpi_device *device;     //the device we are in
         acpi_handle handle;     //the handle of the hotk device
         char status;            //status of the hotk, for LEDs, ...
+        u32 ledd_status;        //status of the LED display
         struct model_data *methods;     //methods available on the laptop
         u8 brightness;          //brightness level
         enum {
@@ -127,7 +131,8 @@ struct asus_hotk {
                 P30,            //Samsung P30
                 S1x,            //S1300A, but also L1400B and M2400A (L84F)
                 S2x,            //S200 (J1 reported), Victor MP-XP7210
-                xxN,            //M2400N, M3700N, M5200N, S1300N, S5200N, W1OOON
+                W1N,            //W1000N
+                xxN,            //M2400N, M3700N, M5200N, M6800N, S1300N, S5200N
                 //(Centrino)
                 END_MODEL
         } model;                //Models currently supported
@@ -332,6 +337,18 @@ static struct model_data model_conf[END_MODEL] = {
          .brightness_down = S2x_PREFIX "_Q0A"},
 
         {
+         .name = "W1N",
+         .mt_mled = "MLED",
+         .mt_wled = "WLED",
+         .mt_ledd = "SLCM",
+         .mt_lcd_switch = xxN_PREFIX "_Q10",
+         .lcd_status = "\\BKLT",
+         .brightness_set = "SPLV",
+         .brightness_get = "GPLV",
+         .display_set = "SDSP",
+         .display_get = "\\ADVG"},
+
+        {
          .name = "xxN",
          .mt_mled = "MLED",
 /* WLED present, but not controlled by ACPI */
@@ -550,6 +567,36 @@ proc_write_mled(struct file *file, const char __user * buffer,
 }
 
 /*
+ * Proc handlers for LED display
+ */
+static int
+proc_read_ledd(char *page, char **start, off_t off, int count, int *eof,
+               void *data)
+{
+        return sprintf(page, "0x%08x\n", hotk->ledd_status);
+}
+
+static int
+proc_write_ledd(struct file *file, const char __user * buffer,
+                unsigned long count, void *data)
+{
+        int value;
+
+        count = parse_arg(buffer, count, &value);
+        if (count > 0) {
+                if (!write_acpi_int
+                    (hotk->handle, hotk->methods->mt_ledd, value, NULL))
+                        printk(KERN_WARNING
+                               "Asus ACPI: LED display write failed\n");
+                else
+                        hotk->ledd_status = (u32) value;
+        } else if (count < 0)
+                printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
+
+        return count;
+}
+
+/*
  * Proc handlers for WLED
  */
 static int
@@ -863,6 +910,11 @@ static int asus_hotk_add_fs(struct acpi_device *device)
                               mode, device);
         }
 
+        if (hotk->methods->mt_ledd) {
+                asus_proc_add(PROC_LEDD, &proc_write_ledd, &proc_read_ledd,
+                              mode, device);
+        }
+
         if (hotk->methods->mt_mled) {
                 asus_proc_add(PROC_MLED, &proc_write_mled, &proc_read_mled,
                               mode, device);
@@ -906,6 +958,8 @@ static int asus_hotk_remove_fs(struct acpi_device *device)
                         remove_proc_entry(PROC_MLED, acpi_device_dir(device));
                 if (hotk->methods->mt_tled)
                         remove_proc_entry(PROC_TLED, acpi_device_dir(device));
+                if (hotk->methods->mt_ledd)
+                        remove_proc_entry(PROC_LEDD, acpi_device_dir(device));
                 if (hotk->methods->mt_lcd_switch && hotk->methods->lcd_status)
                         remove_proc_entry(PROC_LCD, acpi_device_dir(device));
                 if ((hotk->methods->brightness_up
@@ -1033,8 +1087,7 @@ static int asus_hotk_get_info(void)
                  strncmp(model->string.pointer, "M5N", 3) == 0 ||
                  strncmp(model->string.pointer, "M6N", 3) == 0 ||
                  strncmp(model->string.pointer, "S1N", 3) == 0 ||
-                 strncmp(model->string.pointer, "S5N", 3) == 0 ||
-                 strncmp(model->string.pointer, "W1N", 3) == 0)
+                 strncmp(model->string.pointer, "S5N", 3) == 0)
                 hotk->model = xxN;
         else if (strncmp(model->string.pointer, "M1", 2) == 0)
                 hotk->model = M1A;
@@ -1055,6 +1108,8 @@ static int asus_hotk_get_info(void)
                 hotk->model = S2x;
         else if (strncmp(model->string.pointer, "L5", 2) == 0)
                 hotk->model = L5x;
+        else if (strncmp(model->string.pointer, "W1N", 3) == 0)
+                hotk->model = W1N;
 
         if (hotk->model == END_MODEL) {
                 printk("unsupported, trying default values, supply the "
@@ -1078,10 +1133,9 @@ static int asus_hotk_get_info(void)
                  strncmp(model->string.pointer, "M5N", 3) == 0)
                 hotk->methods->mt_mled = NULL;
         /* S5N and M5N have no MLED */
-        else if (strncmp(model->string.pointer, "M2N", 3) == 0 ||
-                 strncmp(model->string.pointer, "W1N", 3) == 0)
+        else if (strncmp(model->string.pointer, "M2N", 3) == 0)
                 hotk->methods->mt_wled = "WLED";
-        /* M2N and W1N have a usable WLED */
+        /* M2N has a usable WLED */
         else if (asus_info) {
                 if (strncmp(asus_info->oem_table_id, "L1", 2) == 0)
                         hotk->methods->mled_status = NULL;
@@ -1175,6 +1229,9 @@ static int asus_hotk_add(struct acpi_device *device)
 
         asus_hotk_found = 1;
 
+        /* LED display is off by default */
+        hotk->ledd_status = 0xFFF;
+
       end:
         if (result) {
                 kfree(hotk);