thinkpad-acpi: fix BEEP ACPI handler warnings

Some ThinkPads want two arguments for BEEP, while others want just
one, causing ACPICA to log warnings like this:

ACPI Warning (nseval-0177): Excess arguments - method [BEEP] needs 1,
found 2 [20080926]

Deal with it.

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

1 files changed, 24 insertions, 2 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 3981b060b7d5..da739d5c9210 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -264,6 +264,7 @@ static struct {
         u32 wan:1;
         u32 uwb:1;
         u32 fan_ctrl_status_undef:1;
+        u32 beep_needs_two_args:1;
         u32 input_device_registered:1;
         u32 platform_drv_registered:1;
         u32 platform_drv_attrs_registered:1;
@@ -5142,8 +5143,17 @@ static struct ibm_struct led_driver_data = {
 
 TPACPI_HANDLE(beep, ec, "BEEP");        /* all except R30, R31 */
 
+#define TPACPI_BEEP_Q1 0x0001
+
+static const struct tpacpi_quirk beep_quirk_table[] __initconst = {
+        TPACPI_Q_IBM('I', 'M', TPACPI_BEEP_Q1), /* 570 */
+        TPACPI_Q_IBM('I', 'U', TPACPI_BEEP_Q1), /* 570E - unverified */
+};
+
 static int __init beep_init(struct ibm_init_struct *iibm)
 {
+        unsigned long quirks;
+
         vdbg_printk(TPACPI_DBG_INIT, "initializing beep subdriver\n");
 
         TPACPI_ACPIHANDLE_INIT(beep);
@@ -5151,6 +5161,11 @@ static int __init beep_init(struct ibm_init_struct *iibm)
         vdbg_printk(TPACPI_DBG_INIT, "beep is %s\n",
                 str_supported(beep_handle != NULL));
 
+        quirks = tpacpi_check_quirks(beep_quirk_table,
+                                     ARRAY_SIZE(beep_quirk_table));
+
+        tp_features.beep_needs_two_args = !!(quirks & TPACPI_BEEP_Q1);
+
         return (beep_handle)? 0 : 1;
 }
 
@@ -5182,8 +5197,15 @@ static int beep_write(char *buf)
                         /* beep_cmd set */
                 } else
                         return -EINVAL;
-                if (!acpi_evalf(beep_handle, NULL, NULL, "vdd", beep_cmd, 0))
-                        return -EIO;
+                if (tp_features.beep_needs_two_args) {
+                        if (!acpi_evalf(beep_handle, NULL, NULL, "vdd",
+                                        beep_cmd, 0))
+                                return -EIO;
+                } else {
+                        if (!acpi_evalf(beep_handle, NULL, NULL, "vd",
+                                        beep_cmd))
+                                return -EIO;
+                }
         }
 
         return 0;