ACPI: thinkpad-acpi: debug facility to emulate the rf switches

This code is required to keep the thinkpad-acpi maintainer sane, and
it is disabled by default.

Add a debug facility to simulate an rfkill hardware rocker switch, a
bluetooth rfkill soft-switch, a WWAN rfkill soft-switch on thinkpads.

The simulated switches obviously do not kill any radios in hardware or
firmware (unlike the real one).  They also don't issue deprecated proc
events.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 201 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index e65448e99b48..431772b8a1d0 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -192,6 +192,17 @@ config THINKPAD_ACPI
 
           If you have an IBM or Lenovo ThinkPad laptop, say Y or M here.
 
+config THINKPAD_ACPI_DEBUGFACILITIES
+        bool "Maintainer debug facilities"
+        depends on THINKPAD_ACPI
+        default n
+        ---help---
+          Enables extra stuff in the thinkpad-acpi which is completely useless
+          for normal use.  Read the driver source to find out what it does.
+
+          Say N here, unless you were told by a kernel maintainer to do
+          otherwise.
+
 config THINKPAD_ACPI_DEBUG
         bool "Verbose debug mode"
         depends on THINKPAD_ACPI
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index ee3fa007f312..a086ce8ed4eb 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -288,6 +288,16 @@ struct tpacpi_led_classdev {
         unsigned int led;
 };
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+static int dbg_wlswemul;
+static int tpacpi_wlsw_emulstate;
+static int dbg_bluetoothemul;
+static int tpacpi_bluetooth_emulstate;
+static int dbg_wwanemul;
+static int tpacpi_wwan_emulstate;
+#endif
+
+
 /****************************************************************************
  ****************************************************************************
  *
@@ -1006,6 +1016,94 @@ static DRIVER_ATTR(version, S_IRUGO,
 
 /* --------------------------------------------------------------------- */
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+
+static void tpacpi_send_radiosw_update(void);
+
+/* wlsw_emulstate ------------------------------------------------------ */
+static ssize_t tpacpi_driver_wlsw_emulstate_show(struct device_driver *drv,
+                                                char *buf)
+{
+        return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_wlsw_emulstate);
+}
+
+static ssize_t tpacpi_driver_wlsw_emulstate_store(struct device_driver *drv,
+                                                const char *buf, size_t count)
+{
+        unsigned long t;
+
+        if (parse_strtoul(buf, 1, &t))
+                return -EINVAL;
+
+        if (tpacpi_wlsw_emulstate != t) {
+                tpacpi_wlsw_emulstate = !!t;
+                tpacpi_send_radiosw_update();
+        } else
+                tpacpi_wlsw_emulstate = !!t;
+
+        return count;
+}
+
+static DRIVER_ATTR(wlsw_emulstate, S_IWUSR | S_IRUGO,
+                tpacpi_driver_wlsw_emulstate_show,
+                tpacpi_driver_wlsw_emulstate_store);
+
+/* bluetooth_emulstate ------------------------------------------------- */
+static ssize_t tpacpi_driver_bluetooth_emulstate_show(
+                                        struct device_driver *drv,
+                                        char *buf)
+{
+        return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_bluetooth_emulstate);
+}
+
+static ssize_t tpacpi_driver_bluetooth_emulstate_store(
+                                        struct device_driver *drv,
+                                        const char *buf, size_t count)
+{
+        unsigned long t;
+
+        if (parse_strtoul(buf, 1, &t))
+                return -EINVAL;
+
+        tpacpi_bluetooth_emulstate = !!t;
+
+        return count;
+}
+
+static DRIVER_ATTR(bluetooth_emulstate, S_IWUSR | S_IRUGO,
+                tpacpi_driver_bluetooth_emulstate_show,
+                tpacpi_driver_bluetooth_emulstate_store);
+
+/* wwan_emulstate ------------------------------------------------- */
+static ssize_t tpacpi_driver_wwan_emulstate_show(
+                                        struct device_driver *drv,
+                                        char *buf)
+{
+        return snprintf(buf, PAGE_SIZE, "%d\n", !!tpacpi_wwan_emulstate);
+}
+
+static ssize_t tpacpi_driver_wwan_emulstate_store(
+                                        struct device_driver *drv,
+                                        const char *buf, size_t count)
+{
+        unsigned long t;
+
+        if (parse_strtoul(buf, 1, &t))
+                return -EINVAL;
+
+        tpacpi_wwan_emulstate = !!t;
+
+        return count;
+}
+
+static DRIVER_ATTR(wwan_emulstate, S_IWUSR | S_IRUGO,
+                tpacpi_driver_wwan_emulstate_show,
+                tpacpi_driver_wwan_emulstate_store);
+
+#endif
+
+/* --------------------------------------------------------------------- */
+
 static struct driver_attribute *tpacpi_driver_attributes[] = {
         &driver_attr_debug_level, &driver_attr_version,
         &driver_attr_interface_version,
@@ -1022,6 +1120,15 @@ static int __init tpacpi_create_driver_attributes(struct device_driver *drv)
                 i++;
         }
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (!res && dbg_wlswemul)
+                res = driver_create_file(drv, &driver_attr_wlsw_emulstate);
+        if (!res && dbg_bluetoothemul)
+                res = driver_create_file(drv, &driver_attr_bluetooth_emulstate);
+        if (!res && dbg_wwanemul)
+                res = driver_create_file(drv, &driver_attr_wwan_emulstate);
+#endif
+
         return res;
 }
 
@@ -1031,6 +1138,12 @@ static void tpacpi_remove_driver_attributes(struct device_driver *drv)
 
         for (i = 0; i < ARRAY_SIZE(tpacpi_driver_attributes); i++)
                 driver_remove_file(drv, tpacpi_driver_attributes[i]);
+
+#ifdef THINKPAD_ACPI_DEBUGFACILITIES
+        driver_remove_file(drv, &driver_attr_wlsw_emulstate);
+        driver_remove_file(drv, &driver_attr_bluetooth_emulstate);
+        driver_remove_file(drv, &driver_attr_wwan_emulstate);
+#endif
 }
 
 /****************************************************************************
@@ -1216,6 +1329,12 @@ static struct attribute_set *hotkey_dev_attributes;
 
 static int hotkey_get_wlsw(int *status)
 {
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (dbg_wlswemul) {
+                *status = !!tpacpi_wlsw_emulstate;
+                return 0;
+        }
+#endif
         if (!acpi_evalf(hkey_handle, status, "WLSW", "d"))
                 return -EIO;
         return 0;
@@ -2222,6 +2341,13 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
                     hotkey_source_mask, hotkey_poll_freq);
 #endif
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (dbg_wlswemul) {
+                tp_features.hotkey_wlsw = 1;
+                printk(TPACPI_INFO
+                        "radio switch emulation enabled\n");
+        } else
+#endif
         /* Not all thinkpads have a hardware radio switch */
         if (acpi_evalf(hkey_handle, &status, "WLSW", "qd")) {
                 tp_features.hotkey_wlsw = 1;
@@ -2656,6 +2782,12 @@ static int bluetooth_get_radiosw(void)
         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status)
                 return RFKILL_STATE_HARD_BLOCKED;
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (dbg_bluetoothemul)
+                return (tpacpi_bluetooth_emulstate) ?
+                        RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
+#endif
+
         if (!acpi_evalf(hkey_handle, &status, "GBDC", "d"))
                 return -EIO;
 
@@ -2689,6 +2821,15 @@ static int bluetooth_set_radiosw(int radio_on, int update_rfk)
             && radio_on)
                 return -EPERM;
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (dbg_bluetoothemul) {
+                tpacpi_bluetooth_emulstate = !!radio_on;
+                if (update_rfk)
+                        bluetooth_update_rfk();
+                return 0;
+        }
+#endif
+
         if (!acpi_evalf(hkey_handle, &status, "GBDC", "d"))
                 return -EIO;
         if (radio_on)
@@ -2792,6 +2933,13 @@ static int __init bluetooth_init(struct ibm_init_struct *iibm)
                 str_supported(tp_features.bluetooth),
                 status);
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (dbg_bluetoothemul) {
+                tp_features.bluetooth = 1;
+                printk(TPACPI_INFO
+                        "bluetooth switch emulation enabled\n");
+        } else
+#endif
         if (tp_features.bluetooth &&
             !(status & TP_ACPI_BLUETOOTH_HWPRESENT)) {
                 /* no bluetooth hardware present in system */
@@ -2890,6 +3038,12 @@ static int wan_get_radiosw(void)
         if (tp_features.hotkey_wlsw && !hotkey_get_wlsw(&status) && !status)
                 return RFKILL_STATE_HARD_BLOCKED;
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (dbg_wwanemul)
+                return (tpacpi_wwan_emulstate) ?
+                        RFKILL_STATE_UNBLOCKED : RFKILL_STATE_SOFT_BLOCKED;
+#endif
+
         if (!acpi_evalf(hkey_handle, &status, "GWAN", "d"))
                 return -EIO;
 
@@ -2923,6 +3077,15 @@ static int wan_set_radiosw(int radio_on, int update_rfk)
             && radio_on)
                 return -EPERM;
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (dbg_wwanemul) {
+                tpacpi_wwan_emulstate = !!radio_on;
+                if (update_rfk)
+                        wan_update_rfk();
+                return 0;
+        }
+#endif
+
         if (!acpi_evalf(hkey_handle, &status, "GWAN", "d"))
                 return -EIO;
         if (radio_on)
@@ -3024,6 +3187,13 @@ static int __init wan_init(struct ibm_init_struct *iibm)
                 str_supported(tp_features.wan),
                 status);
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+        if (dbg_wwanemul) {
+                tp_features.wan = 1;
+                printk(TPACPI_INFO
+                        "wwan switch emulation enabled\n");
+        } else
+#endif
         if (tp_features.wan &&
             !(status & TP_ACPI_WANCARD_HWPRESENT)) {
                 /* no wan hardware present in system */
@@ -6701,6 +6871,26 @@ TPACPI_PARAM(brightness);
 TPACPI_PARAM(volume);
 TPACPI_PARAM(fan);
 
+#ifdef CONFIG_THINKPAD_ACPI_DEBUGFACILITIES
+module_param(dbg_wlswemul, uint, 0);
+MODULE_PARM_DESC(dbg_wlswemul, "Enables WLSW emulation");
+module_param_named(wlsw_state, tpacpi_wlsw_emulstate, bool, 0);
+MODULE_PARM_DESC(wlsw_state,
+                 "Initial state of the emulated WLSW switch");
+
+module_param(dbg_bluetoothemul, uint, 0);
+MODULE_PARM_DESC(dbg_bluetoothemul, "Enables bluetooth switch emulation");
+module_param_named(bluetooth_state, tpacpi_bluetooth_emulstate, bool, 0);
+MODULE_PARM_DESC(bluetooth_state,
+                 "Initial state of the emulated bluetooth switch");
+
+module_param(dbg_wwanemul, uint, 0);
+MODULE_PARM_DESC(dbg_wwanemul, "Enables WWAN switch emulation");
+module_param_named(wwan_state, tpacpi_wwan_emulstate, bool, 0);
+MODULE_PARM_DESC(wwan_state,
+                 "Initial state of the emulated WWAN switch");
+#endif
+
 static void thinkpad_acpi_module_exit(void)
 {
         struct ibm_struct *ibm, *itmp;