Co-developed-by: Nitin Joshi <njoshi1@xxxxxxxxxx>
Signed-off-by: Nitin Joshi <njoshi1@xxxxxxxxxx>
Reviewed-by: Sugumaran <slacshiminar@xxxxxxxxxx>
Reviewed-by: Bastien Nocera <bnocera@xxxxxxxxxx>
Signed-off-by: Mark Pearson <markpearson@xxxxxxxxxx>
---
Changes in v5:
- Updated with review changes from Andy Shevchenko
- Added ABI information to thinkpad-acpi.rst
- improved error handling and parameter passing as recommended
- code cleanup as recommended
- added review tag from bnocera
Changes in v4:
- Correct hotkey event comment as we're handling event
- Remove unnecessary check in dytc_lapmode_refresh
Changes in v3:
- Fixed inaccurate comments
- Used BIT macro to check lapmode bit setting as recommended and update
define name
- Check for new_state == dytc_lapmode in dytc_lapmode_refresh
Changes in v2:
- cleaned up initialisation sequence to be cleaner and avoid spamming
platforms that don't have DYTC with warning message. Tested on P52
- Adding platform-driver-x86 mailing list for review as requested
.../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 ff7f0a4f2475..037eb77414f9 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -4022,8 +4022,8 @@ 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");
@@ -9795,6 +9795,105 @@ 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,
+};
+
/****************************************************************************
****************************************************************************
*
@@ -9842,6 +9941,10 @@ 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)
@@ -10280,6 +10383,10 @@ 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
