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platform/x86: panasonic-laptop: Add support for optical driver power in Y and W series 

The physical optical drive switch is present in Y and W series that
switches on the drive but fails to turn it off. The idea is to be able to
toggle the drive power by software and/or hardware. This patch merges
Martin Lucina <mato@kotelna.sk>'s work that took care of the software part.

Code is also added for the physical switch to power off the drive.

Signed-off-by: Kenneth Chan <kenneth.t.chan@gmail.com>
Link: https://lore.kernel.org/r/20200821181433.17653-2-kenneth.t.chan@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Kenneth Chan 2020-08-22 02:14:25 +08:00 committed by Hans de Goede
parent 19cf70546b
commit d5a81d8e86
1 changed files with 190 additions and 0 deletions
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190
drivers/platform/x86/panasonic-laptop.c
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@ -12,6 +12,13 @@
*---------------------------------------------------------------------------
*
* ChangeLog:
* Aug.18, 2020 Kenneth Chan <kenneth.t.chan@gmail.com>
* -v0.97 add support for cdpower hardware switch
* -v0.96 merge Lucina's enhancement
* Jan.13, 2009 Martin Lucina <mato@kotelna.sk>
* - add support for optical driver power in
* Y and W series
*
* Sep.23, 2008 Harald Welte <laforge@gnumonks.org>
* -v0.95 rename driver from drivers/acpi/pcc_acpi.c to
* drivers/misc/panasonic-laptop.c
@ -115,6 +122,7 @@
#include <linux/acpi.h>
#include <linux/input.h>
#include <linux/input/sparse-keymap.h>
#include <linux/platform_device.h>
#ifndef ACPI_HOTKEY_COMPONENT
#define ACPI_HOTKEY_COMPONENT 0x10000000
@ -213,6 +221,7 @@ struct pcc_acpi {
struct acpi_device *device;
struct input_dev *input_dev;
struct backlight_device *backlight;
struct platform_device *platform;
};
/* method access functions */
@ -345,6 +354,98 @@ static const struct backlight_ops pcc_backlight_ops = {
};
/* 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)) {
pr_err("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 */
/* Call CDDR instead, since they both call the same method
* while CDDI takes 1 arg and we are not quite sure what it is.
*/
status = acpi_evaluate_object(NULL, "\\_SB.CDDR", NULL, NULL);
if (ACPI_FAILURE(status)) {
pr_err("evaluation error _SB.CDDR\n");
result = -EIO;
}
break;
case 1: /* power on */
status = acpi_evaluate_object(NULL, "\\_SB.FBAY", NULL, NULL);
if (ACPI_FAILURE(status)) {
pr_err("evaluation error _SB.FBAY\n");
result = -EIO;
}
break;
default:
result = -EINVAL;
break;
}
out:
return result;
}
/* sysfs user interface functions */
static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
@ -411,16 +512,36 @@ static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
return count;
}
static ssize_t cdpower_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return snprintf(buf, PAGE_SIZE, "%d\n", get_optd_power_state());
}
static ssize_t cdpower_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int err, val;
err = kstrtoint(buf, 10, &val);
if (err)
return err;
set_optd_power_state(val);
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_RW(cdpower);
static struct attribute *pcc_sysfs_entries[] = {
&dev_attr_numbatt.attr,
&dev_attr_lcdtype.attr,
&dev_attr_mute.attr,
&dev_attr_sticky_key.attr,
&dev_attr_cdpower.attr,
NULL,
};
@ -476,6 +597,50 @@ static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
}
}
static void pcc_optd_notify(acpi_handle handle, u32 event, void *data)
{
if (event != ACPI_NOTIFY_EJECT_REQUEST)
return;
set_optd_power_state(0);
}
static int pcc_register_optd_notifier(struct pcc_acpi *pcc, char *node)
{
acpi_status status;
acpi_handle handle;
status = acpi_get_handle(NULL, node, &handle);
if (ACPI_SUCCESS(status)) {
status = acpi_install_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
pcc_optd_notify, pcc);
if (ACPI_FAILURE(status))
pr_err("Failed to register notify on %s\n", node);
} else
return -ENODEV;
return 0;
}
static void pcc_unregister_optd_notifier(struct pcc_acpi *pcc, char *node)
{
acpi_status status = AE_OK;
acpi_handle handle;
status = acpi_get_handle(NULL, node, &handle);
if (ACPI_SUCCESS(status)) {
status = acpi_remove_notify_handler(handle,
ACPI_SYSTEM_NOTIFY,
pcc_optd_notify);
if (ACPI_FAILURE(status))
pr_err("Error removing optd notify handler %s\n",
node);
}
}
static int acpi_pcc_init_input(struct pcc_acpi *pcc)
{
struct input_dev *input_dev;
@ -606,8 +771,27 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
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);
pcc_register_optd_notifier(pcc, "\\_SB.PCI0.EHCI.ERHB.OPTD");
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_input:
@ -627,6 +811,12 @@ static int acpi_pcc_hotkey_remove(struct acpi_device *device)
if (!device || !pcc)
return -EINVAL;
if (pcc->platform) {
device_remove_file(&pcc->platform->dev, &dev_attr_cdpower);
platform_device_unregister(pcc->platform);
}
pcc_unregister_optd_notifier(pcc, "\\_SB.PCI0.EHCI.ERHB.OPTD");
sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
backlight_device_unregister(pcc->backlight);