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
Hans de Goede
Родитель
19cf70546b
Коммит
d5a81d8e86
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@ -12,6 +12,13 @@
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*---------------------------------------------------------------------------
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*
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* ChangeLog:
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* Aug.18, 2020 Kenneth Chan <kenneth.t.chan@gmail.com>
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* -v0.97 add support for cdpower hardware switch
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* -v0.96 merge Lucina's enhancement
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* Jan.13, 2009 Martin Lucina <mato@kotelna.sk>
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* - add support for optical driver power in
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* Y and W series
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*
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* Sep.23, 2008 Harald Welte <laforge@gnumonks.org>
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* -v0.95 rename driver from drivers/acpi/pcc_acpi.c to
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* drivers/misc/panasonic-laptop.c
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@ -115,6 +122,7 @@
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#include <linux/acpi.h>
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#include <linux/input.h>
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#include <linux/input/sparse-keymap.h>
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#include <linux/platform_device.h>
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#ifndef ACPI_HOTKEY_COMPONENT
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#define ACPI_HOTKEY_COMPONENT 0x10000000
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@ -213,6 +221,7 @@ struct pcc_acpi {
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struct acpi_device *device;
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struct input_dev *input_dev;
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struct backlight_device *backlight;
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struct platform_device *platform;
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};
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/* method access functions */
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@ -345,6 +354,98 @@ static const struct backlight_ops pcc_backlight_ops = {
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};
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/* returns ACPI_SUCCESS if methods to control optical drive are present */
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static acpi_status check_optd_present(void)
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{
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acpi_status status = AE_OK;
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acpi_handle handle;
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status = acpi_get_handle(NULL, "\\_SB.STAT", &handle);
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if (ACPI_FAILURE(status))
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goto out;
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status = acpi_get_handle(NULL, "\\_SB.FBAY", &handle);
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if (ACPI_FAILURE(status))
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goto out;
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status = acpi_get_handle(NULL, "\\_SB.CDDI", &handle);
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if (ACPI_FAILURE(status))
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goto out;
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out:
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return status;
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}
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/* get optical driver power state */
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static int get_optd_power_state(void)
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{
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acpi_status status;
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unsigned long long state;
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int result;
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status = acpi_evaluate_integer(NULL, "\\_SB.STAT", NULL, &state);
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if (ACPI_FAILURE(status)) {
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pr_err("evaluation error _SB.STAT\n");
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result = -EIO;
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goto out;
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}
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switch (state) {
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case 0: /* power off */
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result = 0;
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break;
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case 0x0f: /* power on */
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result = 1;
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break;
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default:
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result = -EIO;
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break;
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}
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out:
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return result;
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}
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/* set optical drive power state */
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static int set_optd_power_state(int new_state)
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{
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int result;
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acpi_status status;
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result = get_optd_power_state();
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if (result < 0)
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goto out;
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if (new_state == result)
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goto out;
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switch (new_state) {
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case 0: /* power off */
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/* Call CDDR instead, since they both call the same method
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* while CDDI takes 1 arg and we are not quite sure what it is.
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*/
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status = acpi_evaluate_object(NULL, "\\_SB.CDDR", NULL, NULL);
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if (ACPI_FAILURE(status)) {
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pr_err("evaluation error _SB.CDDR\n");
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result = -EIO;
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}
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break;
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case 1: /* power on */
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status = acpi_evaluate_object(NULL, "\\_SB.FBAY", NULL, NULL);
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if (ACPI_FAILURE(status)) {
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pr_err("evaluation error _SB.FBAY\n");
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result = -EIO;
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}
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break;
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default:
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result = -EINVAL;
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break;
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}
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out:
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return result;
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}
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/* sysfs user interface functions */
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static ssize_t show_numbatt(struct device *dev, struct device_attribute *attr,
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@ -411,16 +512,36 @@ static ssize_t set_sticky(struct device *dev, struct device_attribute *attr,
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return count;
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}
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static ssize_t cdpower_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", get_optd_power_state());
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}
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static ssize_t cdpower_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int err, val;
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err = kstrtoint(buf, 10, &val);
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if (err)
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return err;
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set_optd_power_state(val);
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return count;
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}
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static DEVICE_ATTR(numbatt, S_IRUGO, show_numbatt, NULL);
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static DEVICE_ATTR(lcdtype, S_IRUGO, show_lcdtype, NULL);
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static DEVICE_ATTR(mute, S_IRUGO, show_mute, NULL);
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static DEVICE_ATTR(sticky_key, S_IRUGO | S_IWUSR, show_sticky, set_sticky);
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static DEVICE_ATTR_RW(cdpower);
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static struct attribute *pcc_sysfs_entries[] = {
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&dev_attr_numbatt.attr,
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&dev_attr_lcdtype.attr,
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&dev_attr_mute.attr,
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&dev_attr_sticky_key.attr,
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&dev_attr_cdpower.attr,
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NULL,
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};
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@ -476,6 +597,50 @@ static void acpi_pcc_hotkey_notify(struct acpi_device *device, u32 event)
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}
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}
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static void pcc_optd_notify(acpi_handle handle, u32 event, void *data)
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{
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if (event != ACPI_NOTIFY_EJECT_REQUEST)
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return;
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set_optd_power_state(0);
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}
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static int pcc_register_optd_notifier(struct pcc_acpi *pcc, char *node)
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{
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acpi_status status;
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acpi_handle handle;
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status = acpi_get_handle(NULL, node, &handle);
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if (ACPI_SUCCESS(status)) {
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status = acpi_install_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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pcc_optd_notify, pcc);
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if (ACPI_FAILURE(status))
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pr_err("Failed to register notify on %s\n", node);
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} else
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return -ENODEV;
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return 0;
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}
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static void pcc_unregister_optd_notifier(struct pcc_acpi *pcc, char *node)
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{
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acpi_status status = AE_OK;
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acpi_handle handle;
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status = acpi_get_handle(NULL, node, &handle);
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if (ACPI_SUCCESS(status)) {
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status = acpi_remove_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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pcc_optd_notify);
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if (ACPI_FAILURE(status))
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pr_err("Error removing optd notify handler %s\n",
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node);
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}
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}
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static int acpi_pcc_init_input(struct pcc_acpi *pcc)
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{
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struct input_dev *input_dev;
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@ -606,8 +771,27 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
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if (result)
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goto out_backlight;
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/* optical drive initialization */
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if (ACPI_SUCCESS(check_optd_present())) {
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pcc->platform = platform_device_register_simple("panasonic",
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-1, NULL, 0);
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if (IS_ERR(pcc->platform)) {
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result = PTR_ERR(pcc->platform);
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goto out_backlight;
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}
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result = device_create_file(&pcc->platform->dev,
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&dev_attr_cdpower);
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pcc_register_optd_notifier(pcc, "\\_SB.PCI0.EHCI.ERHB.OPTD");
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if (result)
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goto out_platform;
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} else {
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pcc->platform = NULL;
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}
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return 0;
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out_platform:
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platform_device_unregister(pcc->platform);
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out_backlight:
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backlight_device_unregister(pcc->backlight);
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out_input:
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@ -627,6 +811,12 @@ static int acpi_pcc_hotkey_remove(struct acpi_device *device)
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if (!device || !pcc)
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return -EINVAL;
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if (pcc->platform) {
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device_remove_file(&pcc->platform->dev, &dev_attr_cdpower);
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platform_device_unregister(pcc->platform);
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}
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pcc_unregister_optd_notifier(pcc, "\\_SB.PCI0.EHCI.ERHB.OPTD");
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sysfs_remove_group(&device->dev.kobj, &pcc_attr_group);
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backlight_device_unregister(pcc->backlight);
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