asus_acpi.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,237 行 · 第 1/3 页

static int write_acpi_int(acpi_handle handle, const char *method, int val,
			  struct acpi_buffer *output)
{
	struct acpi_object_list params;	//list of input parameters (an int here)
	union acpi_object in_obj;	//the only param we use
	acpi_status status;

	params.count = 1;
	params.pointer = &in_obj;
	in_obj.type = ACPI_TYPE_INTEGER;
	in_obj.integer.value = val;

	status = acpi_evaluate_object(handle, (char *) method, &params, output);
	return (status == AE_OK);
}


static int read_acpi_int(acpi_handle handle, const char *method, int *val)
{
	struct acpi_buffer output;
	union acpi_object out_obj;
	acpi_status status;

	output.length = sizeof(out_obj);
	output.pointer = &out_obj;

	status = acpi_evaluate_object(handle, (char *) method, NULL, &output);
	*val = out_obj.integer.value;
	return (status == AE_OK) && (out_obj.type == ACPI_TYPE_INTEGER);
}

/*
 * We write our info in page, we begin at offset off and cannot write more
 * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 * number of bytes written in page
 */
static int
proc_read_info(char *page, char **start, off_t off, int count, int *eof,
		void *data)
{
	int len = 0;
	int temp;
	char buf[16];		//enough for all info
	/*
	 * We use the easy way, we don't care of off and count, so we don't set eof
	 * to 1
	 */

	len += sprintf(page, ACPI_HOTK_NAME " " ASUS_ACPI_VERSION "\n");
	len += sprintf(page + len, "Model reference    : %s\n", 
		       hotk->methods->name);
	/* 
	 * The SFUN method probably allows the original driver to get the list 
	 * of features supported by a given model. For now, 0x0100 or 0x0800 
	 * bit signifies that the laptop is equipped with a Wi-Fi MiniPCI card.
	 * The significance of others is yet to be found.
	 */
	if (read_acpi_int(hotk->handle, "SFUN", &temp))
		len += sprintf(page + len, "SFUN value         : 0x%04x\n", temp);
	/*
	 * Another value for userspace: the ASYM method returns 0x02 for
	 * battery low and 0x04 for battery critical, its readings tend to be
	 * more accurate than those provided by _BST. 
	 * Note: since not all the laptops provide this method, errors are
	 * silently ignored.
	 */
	if (read_acpi_int(hotk->handle, "ASYM", &temp))
		len += sprintf(page + len, "ASYM value         : 0x%04x\n", temp);
	if (asus_info) {
		snprintf(buf, 16, "%d", asus_info->length);
		len += sprintf(page + len, "DSDT length        : %s\n", buf);
		snprintf(buf, 16, "%d", asus_info->checksum);
		len += sprintf(page + len, "DSDT checksum      : %s\n", buf);
		snprintf(buf, 16, "%d", asus_info->revision);
		len += sprintf(page + len, "DSDT revision      : %s\n", buf);
		snprintf(buf, 7, "%s", asus_info->oem_id);
		len += sprintf(page + len, "OEM id             : %s\n", buf);
		snprintf(buf, 9, "%s", asus_info->oem_table_id);
		len += sprintf(page + len, "OEM table id       : %s\n", buf);
		snprintf(buf, 16, "%x", asus_info->oem_revision);
		len += sprintf(page + len, "OEM revision       : 0x%s\n", buf);
		snprintf(buf, 5, "%s", asus_info->asl_compiler_id);
		len += sprintf(page + len, "ASL comp vendor id : %s\n", buf);
		snprintf(buf, 16, "%x", asus_info->asl_compiler_revision);
		len += sprintf(page + len, "ASL comp revision  : 0x%s\n", buf);
	}

	return len;
}


/*
 * /proc handlers
 * We write our info in page, we begin at offset off and cannot write more
 * than count bytes. We set eof to 1 if we handle those 2 values. We return the
 * number of bytes written in page
 */

/* Generic LED functions */
static int
read_led(const char *ledname, int ledmask)
{
	if (ledname) {
		int led_status;

		if (read_acpi_int(NULL, ledname, &led_status))
			return led_status;
		else
			printk(KERN_WARNING "Asus ACPI: Error reading LED "
			       "status\n");
	}
	return (hotk->status & ledmask) ? 1 : 0;
}

static int parse_arg(const char __user *buf, unsigned long count, int *val)
{
	char s[32];
	if (!count)
		return 0;
	if (count > 31)
		return -EINVAL;
	if (copy_from_user(s, buf, count))
		return -EFAULT;
	s[count] = 0;
	if (sscanf(s, "%i", val) != 1)
		return -EINVAL;
	return count;
}

/* FIXME: kill extraneous args so it can be called independently */
static int
write_led(const char __user *buffer, unsigned long count,
          char *ledname, int ledmask, int invert)
{
	int value;
	int led_out = 0;

	count = parse_arg(buffer, count, &value);
	if (count > 0)
		led_out = value ? 1 : 0;

	hotk->status =
	    (led_out) ? (hotk->status | ledmask) : (hotk->status & ~ledmask);

	if (invert) /* invert target value */
		led_out = !led_out & 0x1;

	if (!write_acpi_int(hotk->handle, ledname, led_out, NULL))
		printk(KERN_WARNING "Asus ACPI: LED (%s) write failed\n", ledname);

	return count;
}


/*
 * Proc handlers for MLED
 */
static int
proc_read_mled(char *page, char **start, off_t off, int count, int *eof,
	       void *data)
{
	return sprintf(page, "%d\n", read_led(hotk->methods->mled_status, MLED_ON));
}


static int
proc_write_mled(struct file *file, const char __user *buffer,
		unsigned long count, void *data)
{
	return write_led(buffer, count, hotk->methods->mt_mled, MLED_ON, 1);
}

/*
 * Proc handlers for WLED
 */
static int
proc_read_wled(char *page, char **start, off_t off, int count, int *eof,
	       void *data)
{
	return sprintf(page, "%d\n", read_led(hotk->methods->wled_status, WLED_ON));
}

static int
proc_write_wled(struct file *file, const char __user *buffer,
		unsigned long count, void *data)
{
	return write_led(buffer, count, hotk->methods->mt_wled, WLED_ON, 0);
}

/*
 * Proc handlers for TLED
 */
static int
proc_read_tled(char *page, char **start, off_t off, int count, int *eof,
	       void *data)
{
	return sprintf(page, "%d\n", read_led(hotk->methods->tled_status, TLED_ON));
}

static int
proc_write_tled(struct file *file, const char __user *buffer,
		unsigned long count, void *data)
{
	return write_led(buffer, count, hotk->methods->mt_tled, TLED_ON, 0);
}


static int get_lcd_state(void)
{
	int lcd = 0;

	if (hotk->model != L3H) {
	/* We don't have to check anything if we are here */
		if (!read_acpi_int(NULL, hotk->methods->lcd_status, &lcd))
			printk(KERN_WARNING "Asus ACPI: Error reading LCD status\n");
	
		if (hotk->model == L2D)
			lcd = ~lcd;
	} else { /* L3H and the like have to be handled differently */
		acpi_status status = 0;
		struct acpi_object_list input;
		union acpi_object mt_params[2];
		struct acpi_buffer output;
		union acpi_object out_obj;
		
		input.count = 2;
		input.pointer = mt_params;
		/* Note: the following values are partly guessed up, but 
		   otherwise they seem to work */
		mt_params[0].type = ACPI_TYPE_INTEGER;
		mt_params[0].integer.value = 0x02;
		mt_params[1].type = ACPI_TYPE_INTEGER;
		mt_params[1].integer.value = 0x02;

		output.length = sizeof(out_obj);
		output.pointer = &out_obj;
		
		status = acpi_evaluate_object(NULL, hotk->methods->lcd_status, &input, &output);
		if (status != AE_OK)
			return -1;
		if (out_obj.type == ACPI_TYPE_INTEGER)
			/* That's what the AML code does */
			lcd = out_obj.integer.value >> 8;
	}
	
	return (lcd & 1);
}

static int set_lcd_state(int value)
{
	int lcd = 0;
	acpi_status status = 0;

	lcd = value ? 1 : 0;
	if (lcd != get_lcd_state()) {
		/* switch */
		if (hotk->model != L3H) {
			status =
			    acpi_evaluate_object(NULL, hotk->methods->mt_lcd_switch,
						 NULL, NULL);
		} else { /* L3H and the like have to be handled differently */
			if (!write_acpi_int(hotk->handle, hotk->methods->mt_lcd_switch, 0x07, NULL))
				status = AE_ERROR;
			/* L3H's AML executes EHK (0x07) upon Fn+F7 keypress, 
			   the exact behaviour is simulated here */
		}
		if (ACPI_FAILURE(status))
			printk(KERN_WARNING "Asus ACPI: Error switching LCD\n");
	}
	return 0;

}

static int
proc_read_lcd(char *page, char **start, off_t off, int count, int *eof,
	      void *data)
{
	return sprintf(page, "%d\n", get_lcd_state());
}


static int
proc_write_lcd(struct file *file, const char __user *buffer,
	       unsigned long count, void *data)
{
	int value;
	
	count = parse_arg(buffer, count, &value);
	if (count > 0)
		set_lcd_state(value);
	return count;
}


static int read_brightness(void)
{
	int value;
	
	if(hotk->methods->brightness_get) { /* SPLV/GPLV laptop */
		if (!read_acpi_int(hotk->handle, hotk->methods->brightness_get, 
				   &value))
			printk(KERN_WARNING "Asus ACPI: Error reading brightness\n");
	} else if (hotk->methods->brightness_status) { /* For D1 for example */
		if (!read_acpi_int(NULL, hotk->methods->brightness_status, 
				   &value))
			printk(KERN_WARNING "Asus ACPI: Error reading brightness\n");
	} else /* No GPLV method */
		value = hotk->brightness;
	return value;
}

/*
 * Change the brightness level
 */
static void set_brightness(int value)
{
	acpi_status status = 0;

	/* SPLV laptop */
	if(hotk->methods->brightness_set) {
		if (!write_acpi_int(hotk->handle, hotk->methods->brightness_set, 
				    value, NULL))
			printk(KERN_WARNING "Asus ACPI: Error changing brightness\n");
		return;
	}

	/* No SPLV method if we are here, act as appropriate */
	value -= read_brightness();
	while (value != 0) {
		status = acpi_evaluate_object(NULL, (value > 0) ? 
					      hotk->methods->brightness_up : 
					      hotk->methods->brightness_down,
					      NULL, NULL);
		(value > 0) ? value-- : value++;
		if (ACPI_FAILURE(status))
			printk(KERN_WARNING "Asus ACPI: Error changing brightness\n");
	}
	return;
}

static int
proc_read_brn(char *page, char **start, off_t off, int count, int *eof,
	      void *data)
{
	return sprintf(page, "%d\n", read_brightness());
}

static int
proc_write_brn(struct file *file, const char __user *buffer,
	       unsigned long count, void *data)
{
	int value;

	count = parse_arg(buffer, count, &value);
	if (count > 0) {
		value = (0 < value) ? ((15 < value) ? 15 : value) : 0;
			/* 0 <= value <= 15 */
		set_brightness(value);
	} else if (count < 0) {
		printk(KERN_WARNING "Asus ACPI: Error reading user input\n");
	}

	return count;
}

static void set_display(int value)
{
	/* no sanity check needed for now */
	if (!write_acpi_int(hotk->handle, hotk->methods->display_set, 
			    value, NULL))
		printk(KERN_WARNING "Asus ACPI: Error setting display\n");
	return;
}

/*
 * Now, *this* one could be more user-friendly, but so far, no-one has 
 * complained. The significance of bits is the same as in proc_write_disp()
 */
static int
proc_read_disp(char *page, char **start, off_t off, int count, int *eof,
	      void *data)
{
	int value = 0;
	
	if (!read_acpi_int(hotk->handle, hotk->methods->display_get, &value))
		printk(KERN_WARNING "Asus ACPI: Error reading display status\n");
	value &= 0x07; /* needed for some models, shouldn't hurt others */
	return sprintf(page, "%d\n", value);
}

/*
 * Experimental support for display switching. As of now: 1 should activate 
 * the LCD output, 2 should do for CRT, and 4 for TV-Out. Any combination 
 * (bitwise) of these will suffice. I never actually tested 3 displays hooked up 
 * simultaneously, so be warned. See the acpi4asus README for more info.
 */
static int
proc_write_disp(struct file *file, const char __user *buffer,
	       unsigned long count, void *data)
{
	int value;

	count = parse_arg(buffer, count, &value);
	if (count > 0)
		set_display(value);
	else if (count < 0)
		printk(KERN_WARNING "Asus ACPI: Error reading user input\n");

	return count;
}


typedef int (proc_readfunc)(char *page, char **start, off_t off, int count,