[PATCH] I8K: add new BIOS signatures

I8K: add BIOS signatures of a newer Dell laptops, also there can be
     more than one temperature sensor reported by BIOS. Lifted from
     driver 1.25 on Massimo Dal Zotto's site.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 24 insertions, 8 deletions

diff --git a/drivers/char/i8k.c b/drivers/char/i8k.c
index 584e9a4a6f18..6c4b3f986d0c 100644
--- a/drivers/char/i8k.c
+++ b/drivers/char/i8k.c
@@ -35,7 +35,8 @@
 #define I8K_SMM_GET_FAN         0x00a3
 #define I8K_SMM_GET_SPEED       0x02a3
 #define I8K_SMM_GET_TEMP        0x10a3
-#define I8K_SMM_GET_DELL_SIG    0xffa3
+#define I8K_SMM_GET_DELL_SIG1   0xfea3
+#define I8K_SMM_GET_DELL_SIG2   0xffa3
 #define I8K_SMM_BIOS_VERSION    0x00a6
 
 #define I8K_FAN_MULT            30
@@ -226,7 +227,7 @@ static int i8k_set_fan(int fan, int speed)
 /*
  * Read the cpu temperature.
  */
-static int i8k_get_cpu_temp(void)
+static int i8k_get_temp(int sensor)
 {
         struct smm_regs regs = { .eax = I8K_SMM_GET_TEMP, };
         int rc;
@@ -235,7 +236,7 @@ static int i8k_get_cpu_temp(void)
 #ifdef I8K_TEMPERATURE_BUG
         static int prev;
 #endif
-
+        regs.ebx = sensor & 0xff;
         if ((rc = i8k_smm(&regs)) < 0)
                 return rc;
 
@@ -260,9 +261,9 @@ static int i8k_get_cpu_temp(void)
         return temp;
 }
 
-static int i8k_get_dell_signature(void)
+static int i8k_get_dell_signature(int req_fn)
 {
-        struct smm_regs regs = { .eax = I8K_SMM_GET_DELL_SIG, };
+        struct smm_regs regs = { .eax = req_fn, };
         int rc;
 
         if ((rc = i8k_smm(&regs)) < 0)
@@ -301,7 +302,7 @@ static int i8k_ioctl(struct inode *ip, struct file *fp, unsigned int cmd,
                 break;
 
         case I8K_GET_TEMP:
-                val = i8k_get_cpu_temp();
+                val = i8k_get_temp(0);
                 break;
 
         case I8K_GET_SPEED:
@@ -367,7 +368,7 @@ static int i8k_proc_show(struct seq_file *seq, void *offset)
         int fn_key, cpu_temp, ac_power;
         int left_fan, right_fan, left_speed, right_speed;
 
-        cpu_temp        = i8k_get_cpu_temp();                   /* 11100 µs */
+        cpu_temp        = i8k_get_temp(0);                      /* 11100 µs */
         left_fan        = i8k_get_fan_status(I8K_FAN_LEFT);     /*   580 µs */
         right_fan       = i8k_get_fan_status(I8K_FAN_RIGHT);    /*   580 µs */
         left_speed      = i8k_get_fan_speed(I8K_FAN_LEFT);      /*   580 µs */
@@ -421,6 +422,20 @@ static struct dmi_system_id __initdata i8k_dmi_table[] = {
                         DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
                 },
         },
+        {
+                .ident = "Dell Inspiron 2",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron"),
+                },
+        },
+        {
+                .ident = "Dell Latitude 2",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "Latitude"),
+                },
+        },
         { }
 };
 
@@ -451,7 +466,8 @@ static int __init i8k_probe(void)
         /*
          * Get SMM Dell signature
          */
-        if (i8k_get_dell_signature() != 0) {
+        if (i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG1) &&
+            i8k_get_dell_signature(I8K_SMM_GET_DELL_SIG2)) {
                 printk(KERN_ERR "i8k: unable to get SMM Dell signature\n");
                 if (!force)
                         return -ENODEV;