Commit d5a81d8e authored by Kenneth Chan's avatar Kenneth Chan Committed by Hans de Goede
Browse files

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: default avatarKenneth Chan <kenneth.t.chan@gmail.com>
Link: https://lore.kernel.org/r/20200821181433.17653-2-kenneth.t.chan@gmail.com


Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
parent 19cf7054

drivers/platform/x86/panasonic-laptop.c

+190 −0
Original line number Diff line number Diff line
@@ -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);