diff options
Diffstat (limited to '0001-platform-x86-thinkpad_acpi-lap-or-desk-mode-interfac.patch')
| -rw-r--r-- | 0001-platform-x86-thinkpad_acpi-lap-or-desk-mode-interfac.patch | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/0001-platform-x86-thinkpad_acpi-lap-or-desk-mode-interfac.patch b/0001-platform-x86-thinkpad_acpi-lap-or-desk-mode-interfac.patch new file mode 100644 index 000000000..3a15ae09a --- /dev/null +++ b/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 + |