ACPI: thinkpad-acpi: add UWB radio support
Add rfkill support for USB UWB radio devices on very recent ThinkPad
laptop models.
The new subdriver is moslty a trimmed down copy of the wwan subdriver.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index ddc371e..91c0001 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -1413,6 +1413,24 @@
rfkill controller switch "tpacpi_wwan_sw": refer to
Documentation/rfkill.txt for details.
+EXPERIMENTAL: UWB
+-----------------
+
+This feature is marked EXPERIMENTAL because it has not been extensively
+tested and validated in various ThinkPad models yet. The feature may not
+work as expected. USE WITH CAUTION! To use this feature, you need to supply
+the experimental=1 parameter when loading the module.
+
+sysfs rfkill class: switch "tpacpi_uwb_sw"
+
+This feature exports an rfkill controller for the UWB device, if one is
+present and enabled in the BIOS.
+
+Sysfs notes:
+
+ rfkill controller switch "tpacpi_uwb_sw": refer to
+ Documentation/rfkill.txt for details.
+
Multiple Commands, Module Parameters
------------------------------------
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 27d709b..c1d4041 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -169,6 +169,7 @@
enum {
TPACPI_RFK_BLUETOOTH_SW_ID = 0,
TPACPI_RFK_WWAN_SW_ID,
+ TPACPI_RFK_UWB_SW_ID,
};
/* Debugging */
@@ -261,6 +262,7 @@
u32 bright_16levels:1;
u32 bright_acpimode:1;
u32 wan:1;
+ u32 uwb:1;
u32 fan_ctrl_status_undef:1;
u32 input_device_registered:1;
u32 platform_drv_registered:1;
@@ -317,6 +319,8 @@
static int tpacpi_bluetooth_emulstate;
static int dbg_wwanemul;
static int tpacpi_wwan_emulstate;
+static int dbg_uwbemul;
+static int tpacpi_uwb_emulstate;
#endif
@@ -967,6 +971,7 @@
struct rfkill **rfk,
const enum rfkill_type rfktype,
const char *name,
+ const bool set_default,
int (*toggle_radio)(void *, enum rfkill_state),
int (*get_state)(void *, enum rfkill_state *))
{
@@ -978,7 +983,7 @@
printk(TPACPI_ERR
"failed to read initial state for %s, error %d; "
"will turn radio off\n", name, res);
- } else {
+ } else if (set_default) {
/* try to set the initial state as the default for the rfkill
* type, since we ask the firmware to preserve it across S5 in
* NVRAM */
@@ -1148,6 +1153,31 @@
tpacpi_driver_wwan_emulstate_show,
tpacpi_driver_wwan_emulstate_store);
+/* uwb_emulstate ------------------------------------------------- */
+static ssize_t tpacpi_driver_uwb_emulstate_show(
+ struct device_driver *drv,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_uwb_emulstate);
+}
+
+static ssize_t tpacpi_driver_uwb_emulstate_store(
+ struct device_driver *drv,
+ const char *buf, size_t count)
+{
+ unsigned long t;
+
+ if (parse_strtoul(buf, 1, &t))
+ return -EINVAL;
+
+ tpacpi_uwb_emulstate = !!t;
+
+ return count;
+}
+
+static DRIVER_ATTR(uwb_emulstate, S_IWUSR | S_IRUGO,
+ tpacpi_driver_uwb_emulstate_show,
+ tpacpi_driver_uwb_emulstate_store);
#endif
/* --------------------------------------------------------------------- */
@@ -1175,6 +1205,8 @@
res = driver_create_file(drv, &driver_attr_bluetooth_emulstate);
if (!res && dbg_wwanemul)
res = driver_create_file(drv, &driver_attr_wwan_emulstate);
+ if (!res && dbg_uwbemul)
+ res = driver_create_file(drv, &driver_attr_uwb_emulstate);
#endif
return res;
@@ -1191,6 +1223,7 @@
driver_remove_file(drv, &driver_attr_wlsw_emulstate);
driver_remove_file(drv, &driver_attr_bluetooth_emulstate);
driver_remove_file(drv, &driver_attr_wwan_emulstate);
+ driver_remove_file(drv, &driver_attr_uwb_emulstate);
#endif
}
@@ -2125,6 +2158,7 @@
static void bluetooth_update_rfk(void);
static void wan_update_rfk(void);
+static void uwb_update_rfk(void);
static void tpacpi_send_radiosw_update(void)
{
int wlsw;
@@ -2134,6 +2168,8 @@
bluetooth_update_rfk();
if (tp_features.wan)
wan_update_rfk();
+ if (tp_features.uwb)
+ uwb_update_rfk();
if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&wlsw)) {
mutex_lock(&tpacpi_inputdev_send_mutex);
@@ -3035,6 +3071,7 @@
&tpacpi_bluetooth_rfkill,
RFKILL_TYPE_BLUETOOTH,
"tpacpi_bluetooth_sw",
+ true,
tpacpi_bluetooth_rfk_set,
tpacpi_bluetooth_rfk_get);
if (res) {
@@ -3309,6 +3346,7 @@
&tpacpi_wan_rfkill,
RFKILL_TYPE_WWAN,
"tpacpi_wwan_sw",
+ true,
tpacpi_wan_rfk_set,
tpacpi_wan_rfk_get);
if (res) {
@@ -3366,6 +3404,162 @@
};
/*************************************************************************
+ * UWB subdriver
+ */
+
+enum {
+ /* ACPI GUWB/SUWB bits */
+ TP_ACPI_UWB_HWPRESENT = 0x01, /* UWB hw available */
+ TP_ACPI_UWB_RADIOSSW = 0x02, /* UWB radio enabled */
+};
+
+static struct rfkill *tpacpi_uwb_rfkill;
+
+static int uwb_get_radiosw(void)
+{
+ int status;
+
+ if (!tp_features.uwb)
+ return -ENODEV;
+
+ /* WLSW overrides UWB in firmware/hardware, reflect that */
+ if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status)
+ return RFKILL_STATE_HARD_BLOCKED;
+
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+ if (dbg_uwbemul)
+ return (tpacpi_uwb_emulstate) ?
+ RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
+#endif
+
+ if (!acpi_evalf(hkey_handle, &status, "GUWB", "d"))
+ return -EIO;
+
+ return ((status & TP_ACPI_UWB_RADIOSSW) != 0) ?
+ RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
+}
+
+static void uwb_update_rfk(void)
+{
+ int status;
+
+ if (!tpacpi_uwb_rfkill)
+ return;
+
+ status = uwb_get_radiosw();
+ if (status < 0)
+ return;
+ rfkill_force_state(tpacpi_uwb_rfkill, status);
+}
+
+static int uwb_set_radiosw(int radio_on, int update_rfk)
+{
+ int status;
+
+ if (!tp_features.uwb)
+ return -ENODEV;
+
+ /* WLSW overrides UWB in firmware/hardware, but there is no
+ * reason to risk weird behaviour. */
+ if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status
+ && radio_on)
+ return -EPERM;
+
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+ if (dbg_uwbemul) {
+ tpacpi_uwb_emulstate = !!radio_on;
+ if (update_rfk)
+ uwb_update_rfk();
+ return 0;
+ }
+#endif
+
+ status = (radio_on) ? TP_ACPI_UWB_RADIOSSW : 0;
+ if (!acpi_evalf(hkey_handle, NULL, "SUWB", "vd", status))
+ return -EIO;
+
+ if (update_rfk)
+ uwb_update_rfk();
+
+ return 0;
+}
+
+/* --------------------------------------------------------------------- */
+
+static int tpacpi_uwb_rfk_get(void *data, enum rfkill_state *state)
+{
+ int uwbs = uwb_get_radiosw();
+
+ if (uwbs < 0)
+ return uwbs;
+
+ *state = uwbs;
+ return 0;
+}
+
+static int tpacpi_uwb_rfk_set(void *data, enum rfkill_state state)
+{
+ return uwb_set_radiosw((state == RFKILL_STATE_UNBLOCKED), 0);
+}
+
+static void uwb_exit(void)
+{
+ if (tpacpi_uwb_rfkill)
+ rfkill_unregister(tpacpi_uwb_rfkill);
+}
+
+static int __init uwb_init(struct ibm_init_struct *iibm)
+{
+ int res;
+ int status = 0;
+
+ vdbg_printk(TPACPI_DBG_INIT, "initializing uwb subdriver\n");
+
+ TPACPI_ACPIHANDLE_INIT(hkey);
+
+ tp_features.uwb = hkey_handle &&
+ acpi_evalf(hkey_handle, &status, "GUWB", "qd");
+
+ vdbg_printk(TPACPI_DBG_INIT, "uwb is %s, status 0x%02x\n",
+ str_supported(tp_features.uwb),
+ status);
+
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+ if (dbg_uwbemul) {
+ tp_features.uwb = 1;
+ printk(TPACPI_INFO
+ "uwb switch emulation enabled\n");
+ } else
+#endif
+ if (tp_features.uwb &&
+ !(status & TP_ACPI_UWB_HWPRESENT)) {
+ /* no uwb hardware present in system */
+ tp_features.uwb = 0;
+ dbg_printk(TPACPI_DBG_INIT,
+ "uwb hardware not installed\n");
+ }
+
+ if (!tp_features.uwb)
+ return 1;
+
+ res = tpacpi_new_rfkill(TPACPI_RFK_UWB_SW_ID,
+ &tpacpi_uwb_rfkill,
+ RFKILL_TYPE_UWB,
+ "tpacpi_uwb_sw",
+ false,
+ tpacpi_uwb_rfk_set,
+ tpacpi_uwb_rfk_get);
+
+ return res;
+}
+
+static struct ibm_struct uwb_driver_data = {
+ .name = "uwb",
+ .exit = uwb_exit,
+ .flags.experimental = 1,
+};
+
+/*************************************************************************
* Video subdriver
*/
@@ -6830,6 +7024,10 @@
.init = wan_init,
.data = &wan_driver_data,
},
+ {
+ .init = uwb_init,
+ .data = &uwb_driver_data,
+ },
#ifdef CONFIG_THINKPAD_ACPI_VIDEO
{
.init = video_init,
@@ -6986,6 +7184,12 @@
module_param_named(wwan_state, tpacpi_wwan_emulstate, bool, 0);
MODULE_PARM_DESC(wwan_state,
"Initial state of the emulated WWAN switch");
+
+module_param(dbg_uwbemul, uint, 0);
+MODULE_PARM_DESC(dbg_uwbemul, "Enables UWB switch emulation");
+module_param_named(uwb_state, tpacpi_uwb_emulstate, bool, 0);
+MODULE_PARM_DESC(uwb_state,
+ "Initial state of the emulated UWB switch");
#endif
static void thinkpad_acpi_module_exit(void)