patch-2.4.20 linux-2.4.20/drivers/char/i8k.c

• Lines: 173
• Date: Thu Nov 28 15:53:12 2002
• Orig file: linux-2.4.19/drivers/char/i8k.c
• Orig date: Fri Dec 21 09:41:54 2001

diff -urN linux-2.4.19/drivers/char/i8k.c linux-2.4.20/drivers/char/i8k.c
@@ -22,12 +22,15 @@
 #include <linux/init.h>
 #include <linux/proc_fs.h>
 #include <linux/apm_bios.h>
+#include <linux/kbd_kern.h>
+#include <linux/kbd_ll.h>
+#include <linux/timer.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
 
 #include <linux/i8k.h>
 
-#define I8K_VERSION		"1.7 21/11/2001"
+#define I8K_VERSION		"1.13 14/05/2002"
 
 #define I8K_SMM_FN_STATUS	0x0025
 #define I8K_SMM_POWER_STATUS	0x0069
@@ -55,6 +58,19 @@
 
 #define DELL_SIGNATURE		"Dell Computer"
 
+/* Interval between polling of keys, in jiffies. */
+#define I8K_POLL_INTERVAL	(HZ/20)
+#define I8K_REPEAT_DELAY	250	/* 250 ms */
+#define I8K_REPEAT_RATE		10
+
+/*
+ * (To be escaped) Scancodes for the keys.  These were chosen to match other
+ * "Internet" keyboards.
+ */
+#define I8K_KEYS_UP_SCANCODE	0x30
+#define I8K_KEYS_DOWN_SCANCODE	0x2e
+#define I8K_KEYS_MUTE_SCANCODE	0x20
+
 static char *supported_models[] = {
     "Inspiron",
     "Latitude",
@@ -67,19 +83,34 @@
 static char serial_number[16] = "?";
 
 int force = 0;
+int restricted = 0;
+int handle_buttons = 0;
+int repeat_delay = I8K_REPEAT_DELAY;
+int repeat_rate = I8K_REPEAT_RATE;
 int power_status = 0;
 
+static struct timer_list  i8k_keys_timer;
+
 MODULE_AUTHOR("Massimo Dal Zotto (dz@debian.org)");
 MODULE_DESCRIPTION("Driver for accessing SMM BIOS on Dell laptops");
 MODULE_LICENSE("GPL");
 MODULE_PARM(force, "i");
+MODULE_PARM(restricted, "i");
+MODULE_PARM(handle_buttons, "i");
+MODULE_PARM(repeat_delay, "i");
+MODULE_PARM(repeat_rate, "i");
 MODULE_PARM(power_status, "i");
 MODULE_PARM_DESC(force, "Force loading without checking for supported models");
+MODULE_PARM_DESC(restricted, "Allow fan control if SYS_ADMIN capability set");
+MODULE_PARM_DESC(handle_buttons, "Generate keyboard events for i8k buttons");
+MODULE_PARM_DESC(repeat_delay, "I8k buttons repeat delay (ms)");
+MODULE_PARM_DESC(repeat_rate, "I8k buttons repeat rate");
 MODULE_PARM_DESC(power_status, "Report power status in /proc/i8k");
 
 static ssize_t i8k_read(struct file *, char *, size_t, loff_t *);
 static int i8k_ioctl(struct inode *, struct file *, unsigned int,
 		     unsigned long);
+static void i8k_keys_set_timer(void);
 
 static struct file_operations i8k_fops = {
     read:	i8k_read,
@@ -370,6 +401,9 @@
 	break;
 
     case I8K_SET_FAN:
+	if (restricted && !capable(CAP_SYS_ADMIN)) {
+	    return -EPERM;
+	}
 	if (copy_from_user(&val, (int *)arg, sizeof(int))) {
 	    return -EFAULT;
 	}
@@ -483,6 +517,61 @@
     return len;
 }
 
+/*
+ * i8k_keys stuff. Thanks to David Bustos <bustos@caltech.edu>
+ */
+
+static unsigned char i8k_keys_make_scancode(int x) {
+    switch (x) {
+    case I8K_FN_UP:	return I8K_KEYS_UP_SCANCODE;
+    case I8K_FN_DOWN:	return I8K_KEYS_DOWN_SCANCODE;
+    case I8K_FN_MUTE:	return I8K_KEYS_MUTE_SCANCODE;
+    }
+
+    return 0;
+}
+
+static void i8k_keys_poll(unsigned long data) {
+    static int last = 0;
+    static int repeat = 0;
+
+    int  curr;
+
+    curr = i8k_get_fn_status();
+    if (curr >= 0) {
+	if (curr != last) {
+	    repeat = jiffies + (HZ * repeat_delay / 1000);
+
+	    if (last != 0) {
+		handle_scancode(0xe0, 0);
+		handle_scancode(i8k_keys_make_scancode(last), 0);
+	    }
+
+	    if (curr != 0) {
+		handle_scancode(0xe0, 1);
+		handle_scancode(i8k_keys_make_scancode(curr), 1);
+	    }
+	} else {
+	    /* Generate keyboard repeat events with current scancode -- dz */
+	    if ((curr) && (repeat_rate > 0) && (jiffies >= repeat)) {
+		repeat = jiffies + (HZ / repeat_rate);
+		handle_scancode(0xe0, 1);
+		handle_scancode(i8k_keys_make_scancode(curr), 1);
+	    }
+	}
+
+	last = curr;
+    }
+
+    /* Reset the timer. */
+    i8k_keys_set_timer();
+}
+
+static void i8k_keys_set_timer() {
+    i8k_keys_timer.expires = jiffies + I8K_POLL_INTERVAL;
+    add_timer(&i8k_keys_timer);
+}
+
 static char* __init string_trim(char *s, int size)
 {
     int len;
@@ -757,6 +846,16 @@
 	   "Dell laptop SMM driver v%s Massimo Dal Zotto (dz@debian.org)\n",
 	   I8K_VERSION);
 
+    /* Register the i8k_keys timer. */
+    if (handle_buttons) {
+	printk(KERN_INFO
+	       "i8k: enabling buttons events, delay=%d, rate=%d\n",
+	       repeat_delay, repeat_rate);
+	init_timer(&i8k_keys_timer);
+	i8k_keys_timer.function = i8k_keys_poll;
+	i8k_keys_set_timer();
+    }
+
     return 0;
 }
 
@@ -771,6 +870,11 @@
     /* Remove the proc entry */
     remove_proc_entry("i8k", NULL);
 
+    /* Unregister the i8k_keys timer. */
+    while (handle_buttons && !del_timer(&i8k_keys_timer)) {
+	schedule_timeout(I8K_POLL_INTERVAL);
+    }
+
     printk(KERN_INFO "i8k: module unloaded\n");
 }
 #endif