Add support for power control of the built in optical drive on models
with the required ACPI methods present. Tested on Panasonic CF-W4.
Creates an interface in /sys/devices/platform/panasonic/cdpower, to
which you can write "1" to switch the drive on, "0" to switch it off
or read from to query the current state.
Signed-off-by: Martin Lucina <mato@xxxxxxxxxx>
---
Harald, this should address all the comments in this thread. I've
removed the DMI table and enable the code if _SB.{STAT,FBAY,CDDI} are
all present.
I've not figured out how to return an actual error from the sysfs
show/store functions so I've at least added ACPI_DEBUG_PRINT to print an
error if the relevant methods fail.
-mato
--- linux-2.6.28/drivers/misc/panasonic-laptop.c.orig 2009-01-14 19:10:33.626598152 +0100
+++ linux-2.6.28/drivers/misc/panasonic-laptop.c 2009-01-14 19:22:06.500598198 +0100
@@ -24,6 +24,9 @@
*---------------------------------------------------------------------------
*
* ChangeLog:
+ * Jan.14, 2009 Martin Lucina <mato@xxxxxxxxxx>
+ * -v0.96 add support for optical drive power control
+ * via /sys/devices/platform/panasonic/cdpower
* Sep.23, 2008 Harald Welte <laforge@xxxxxxxxxxxx>
* -v0.95 rename driver from drivers/acpi/pcc_acpi.c to
* drivers/misc/panasonic-laptop.c
@@ -127,6 +130,7 @@
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#include <linux/input.h>
+#include <linux/platform_device.h>
#ifndef ACPI_HOTKEY_COMPONENT
@@ -219,6 +223,7 @@ struct pcc_acpi {
struct acpi_device *device;
struct input_dev *input_dev;
struct backlight_device *backlight;
+ struct platform_device *platform;
int keymap[KEYMAP_SIZE];
};
@@ -360,6 +365,96 @@ static struct backlight_ops pcc_backligh
.update_status = bl_set_status,
};
+/* returns ACPI_SUCCESS if methods to control optical drive are present */
+
+static acpi_status check_optd_present(void)
+{
+ acpi_status status = AE_OK;
+ acpi_handle handle;
+
+ status = acpi_get_handle(NULL, "\\_SB.STAT", &handle);
+ if (ACPI_FAILURE(status))
+ goto out;
+ status = acpi_get_handle(NULL, "\\_SB.FBAY", &handle);
+ if (ACPI_FAILURE(status))
+ goto out;
+ status = acpi_get_handle(NULL, "\\_SB.CDDI", &handle);
+ if (ACPI_FAILURE(status))
+ goto out;
+
+out:
+ return status;
+}
+
+/* get optical driver power state */
+
+static int get_optd_power_state(void)
+{
+ acpi_status status;
+ unsigned long long state;
+ int result;
+
+ status = acpi_evaluate_integer(NULL, "\\_SB.STAT", NULL, &state);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "evaluation error _SB.STAT\n"));
+ result = -EIO;
+ goto out;
+ }
+ switch (state) {
+ case 0: /* power off */
+ result = 0;
+ break;
+ case 0x0f: /* power on */
+ result = 1;
+ break;
+ default:
+ result = -EIO;
+ break;
+ }
+
+out:
+ return result;
+}
+
+/* set optical drive power state */
+
+static int set_optd_power_state(int new_state)
+{
+ int result;
+ acpi_status status;
+
+ result = get_optd_power_state();
+ if (result < 0)
+ goto out;
+ if (new_state == result)
+ goto out;
+
+ switch (new_state) {
+ case 0: /* power off */
+ status = acpi_evaluate_object(NULL, "\\_SB.CDDI", NULL, NULL);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "evaluation error _SB.CDDI\n"));
+ result = -EIO;
+ }
+ break;
+ case 1: /* power on */
+ status = acpi_evaluate_object(NULL, "\\_SB.FBAY", NULL, NULL);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "evaluation error _SB.FBAY\n"));
+ result = -EIO;
+ }
+ break;
+ default:
+ result = -EINVAL;
+ break;
+ }
+
+out:
+ return result;
+}
/* sysfs user interface functions */
@@ -427,10 +522,29 @@ static ssize_t set_sticky(struct device
return count;
}
+static ssize_t show_cdpower(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", get_optd_power_state());
+}
+
+static ssize_t set_cdpower(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int value;
+
+ if (count) {
+ value = simple_strtoul(buf, NULL, 10);
+ set_optd_power_state(value);
+ }
+ return count;
+}
+
static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
+static DEVICE_ATTR(cdpower, S_IRUGO | S_IWUSR, show_cdpower, set_cdpower);
static struct attribute *pcc_sysfs_entries[] = {
&dev_attr_numbatt.attr,
@@ -691,8 +805,26 @@ static int acpi_pcc_hotkey_add(struct ac
if (result)
goto out_backlight;
+ /* optical drive initialization */
+ if (ACPI_SUCCESS(check_optd_present())) {
+ pcc->platform = platform_device_register_simple("panasonic",
+ -1, NULL, 0);
+ if (IS_ERR(pcc->platform)) {
+ result = PTR_ERR(pcc->platform);
+ goto out_backlight;
+ }
+ result = device_create_file(&pcc->platform->dev,
+ &dev_attr_cdpower);
+ if (result)
+ goto out_platform;
+ } else {
+ pcc->platform = NULL;
+ }
+
return 0;
+out_platform:
+ platform_device_unregister(pcc->platform);
out_backlight:
backlight_device_unregister(pcc->backlight);
out_notify:
@@ -738,6 +870,11 @@ static int acpi_pcc_hotkey_remove(struct
if (!device || !pcc)
return -EINVAL;
+ if (pcc->platform) {
+ device_remove_file(&pcc->platform->dev, &dev_attr_cdpower);
+ platform_device_unregister(pcc->platform);
+ }
+
sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
backlight_device_unregister(pcc->backlight);
--
To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
