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-rw-r--r--SOURCES/0001-platform-x86-thinkpad_acpi-lap-or-desk-mode-interfac.patch202
1 files changed, 202 insertions, 0 deletions
diff --git a/SOURCES/0001-platform-x86-thinkpad_acpi-lap-or-desk-mode-interfac.patch b/SOURCES/0001-platform-x86-thinkpad_acpi-lap-or-desk-mode-interfac.patch
new file mode 100644
index 0000000..3a15ae0
--- /dev/null
+++ b/SOURCES/0001-platform-x86-thinkpad_acpi-lap-or-desk-mode-interfac.patch
@@ -0,0 +1,202 @@
+From acf7f4a59114471c3964f118564fe8e7a6f34bb8 Mon Sep 17 00:00:00 2001
+From: Mark Pearson <markpearson@lenovo.com>
+Date: Thu, 2 Jul 2020 21:23:53 -0400
+Subject: [PATCH] platform/x86: thinkpad_acpi: lap or desk mode interface
+
+Newer Lenovo Thinkpad platforms have support to identify whether the
+system is on-lap or not using an ACPI DYTC event from the firmware.
+
+This patch provides the ability to retrieve the current mode via sysfs
+entrypoints and will be used by userspace for thermal mode and WWAN
+functionality
+
+Co-developed-by: Nitin Joshi <njoshi1@lenovo.com>
+Signed-off-by: Nitin Joshi <njoshi1@lenovo.com>
+Reviewed-by: Sugumaran <slacshiminar@lenovo.com>
+Reviewed-by: Bastien Nocera <bnocera@redhat.com>
+Signed-off-by: Mark Pearson <markpearson@lenovo.com>
+Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+---
+ .../admin-guide/laptops/thinkpad-acpi.rst | 15 +++
+ drivers/platform/x86/thinkpad_acpi.c | 111 +++++++++++++++++-
+ 2 files changed, 124 insertions(+), 2 deletions(-)
+
+diff --git a/Documentation/admin-guide/laptops/thinkpad-acpi.rst b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
+index 822907dcc845..99066aa8d97b 100644
+--- a/Documentation/admin-guide/laptops/thinkpad-acpi.rst
++++ b/Documentation/admin-guide/laptops/thinkpad-acpi.rst
+@@ -50,6 +50,7 @@ detailed description):
+ - WAN enable and disable
+ - UWB enable and disable
+ - LCD Shadow (PrivacyGuard) enable and disable
++ - Lap mode sensor
+
+ A compatibility table by model and feature is maintained on the web
+ site, http://ibm-acpi.sf.net/. I appreciate any success or failure
+@@ -1432,6 +1433,20 @@ The first command ensures the best viewing angle and the latter one turns
+ on the feature, restricting the viewing angles.
+
+
++DYTC Lapmode sensor
++------------------
++
++sysfs: dytc_lapmode
++
++Newer thinkpads and mobile workstations have the ability to determine if
++the device is in deskmode or lapmode. This feature is used by user space
++to decide if WWAN transmission can be increased to maximum power and is
++also useful for understanding the different thermal modes available as
++they differ between desk and lap mode.
++
++The property is read-only. If the platform doesn't have support the sysfs
++class is not created.
++
+ EXPERIMENTAL: UWB
+ -----------------
+
+diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
+index 0f6fceda5fc0..7fee3c1c2418 100644
+--- a/drivers/platform/x86/thinkpad_acpi.c
++++ b/drivers/platform/x86/thinkpad_acpi.c
+@@ -4030,8 +4030,8 @@ static bool hotkey_notify_6xxx(const u32 hkey,
+ return true;
+ case TP_HKEY_EV_THM_CSM_COMPLETED:
+ pr_debug("EC reports: Thermal Control Command set completed (DYTC)\n");
+- /* recommended action: do nothing, we don't have
+- * Lenovo ATM information */
++ /* Thermal event - pass on to event handler */
++ tpacpi_driver_event(hkey);
+ return true;
+ case TP_HKEY_EV_THM_TRANSFM_CHANGED:
+ pr_debug("EC reports: Thermal Transformation changed (GMTS)\n");
+@@ -9803,6 +9803,105 @@ static struct ibm_struct lcdshadow_driver_data = {
+ .write = lcdshadow_write,
+ };
+
++/*************************************************************************
++ * DYTC subdriver, for the Lenovo lapmode feature
++ */
++
++#define DYTC_CMD_GET 2 /* To get current IC function and mode */
++#define DYTC_GET_LAPMODE_BIT 17 /* Set when in lapmode */
++
++static bool dytc_lapmode;
++
++static void dytc_lapmode_notify_change(void)
++{
++ sysfs_notify(&tpacpi_pdev->dev.kobj, NULL, "dytc_lapmode");
++}
++
++static int dytc_command(int command, int *output)
++{
++ acpi_handle dytc_handle;
++
++ if (ACPI_FAILURE(acpi_get_handle(hkey_handle, "DYTC", &dytc_handle))) {
++ /* Platform doesn't support DYTC */
++ return -ENODEV;
++ }
++ if (!acpi_evalf(dytc_handle, output, NULL, "dd", command))
++ return -EIO;
++ return 0;
++}
++
++static int dytc_lapmode_get(bool *state)
++{
++ int output, err;
++
++ err = dytc_command(DYTC_CMD_GET, &output);
++ if (err)
++ return err;
++ *state = output & BIT(DYTC_GET_LAPMODE_BIT) ? true : false;
++ return 0;
++}
++
++static void dytc_lapmode_refresh(void)
++{
++ bool new_state;
++ int err;
++
++ err = dytc_lapmode_get(&new_state);
++ if (err || (new_state == dytc_lapmode))
++ return;
++
++ dytc_lapmode = new_state;
++ dytc_lapmode_notify_change();
++}
++
++/* sysfs lapmode entry */
++static ssize_t dytc_lapmode_show(struct device *dev,
++ struct device_attribute *attr,
++ char *buf)
++{
++ return snprintf(buf, PAGE_SIZE, "%d\n", dytc_lapmode);
++}
++
++static DEVICE_ATTR_RO(dytc_lapmode);
++
++static struct attribute *dytc_attributes[] = {
++ &dev_attr_dytc_lapmode.attr,
++ NULL,
++};
++
++static const struct attribute_group dytc_attr_group = {
++ .attrs = dytc_attributes,
++};
++
++static int tpacpi_dytc_init(struct ibm_init_struct *iibm)
++{
++ int err;
++
++ err = dytc_lapmode_get(&dytc_lapmode);
++ /* If support isn't available (ENODEV) then don't return an error
++ * but just don't create the sysfs group
++ */
++ if (err == -ENODEV)
++ return 0;
++ /* For all other errors we can flag the failure */
++ if (err)
++ return err;
++
++ /* Platform supports this feature - create the group */
++ err = sysfs_create_group(&tpacpi_pdev->dev.kobj, &dytc_attr_group);
++ return err;
++}
++
++static void dytc_exit(void)
++{
++ sysfs_remove_group(&tpacpi_pdev->dev.kobj, &dytc_attr_group);
++}
++
++static struct ibm_struct dytc_driver_data = {
++ .name = "dytc",
++ .exit = dytc_exit,
++};
++
+ /****************************************************************************
+ ****************************************************************************
+ *
+@@ -9850,6 +9949,10 @@ static void tpacpi_driver_event(const unsigned int hkey_event)
+
+ mutex_unlock(&kbdlight_mutex);
+ }
++
++ if (hkey_event == TP_HKEY_EV_THM_CSM_COMPLETED)
++ dytc_lapmode_refresh();
++
+ }
+
+ static void hotkey_driver_event(const unsigned int scancode)
+@@ -10288,6 +10391,10 @@ static struct ibm_init_struct ibms_init[] __initdata = {
+ .init = tpacpi_lcdshadow_init,
+ .data = &lcdshadow_driver_data,
+ },
++ {
++ .init = tpacpi_dytc_init,
++ .data = &dytc_driver_data,
++ },
+ };
+
+ static int __init set_ibm_param(const char *val, const struct kernel_param *kp)
+--
+2.26.2
+