[media] gspca_cpia1: Add support for button

Not only the qx3 microscope has a button, but some cameras too. Tested
with the Trust sp@cecam 100 (and with a creative and ezcam without button).

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 26 insertions, 5 deletions

diff --git a/drivers/media/video/gspca/cpia1.c b/drivers/media/video/gspca/cpia1.c
index 2a4a428f2018..9ddbac680663 100644
--- a/drivers/media/video/gspca/cpia1.c
+++ b/drivers/media/video/gspca/cpia1.c
@@ -28,6 +28,7 @@
 
 #define MODULE_NAME "cpia1"
 
+#include <linux/input.h>
 #include "gspca.h"
 
 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
@@ -653,10 +654,15 @@ static int do_command(struct gspca_dev *gspca_dev, u16 command,
                 break;
 
         case CPIA_COMMAND_ReadMCPorts:
-                if (!sd->params.qx3.qx3_detected)
-                        break;
                 /* test button press */
-                sd->params.qx3.button = ((gspca_dev->usb_buf[1] & 0x02) == 0);
+                a = ((gspca_dev->usb_buf[1] & 0x02) == 0);
+                if (a != sd->params.qx3.button) {
+#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
+                        input_report_key(gspca_dev->input_dev, KEY_CAMERA, a);
+                        input_sync(gspca_dev->input_dev);
+#endif
+                        sd->params.qx3.button = a;
+                }
                 if (sd->params.qx3.button) {
                         /* button pressed - unlock the latch */
                         do_command(gspca_dev, CPIA_COMMAND_WriteMCPort,
@@ -1738,6 +1744,8 @@ static int sd_start(struct gspca_dev *gspca_dev)
 
 static void sd_stopN(struct gspca_dev *gspca_dev)
 {
+        struct sd *sd = (struct sd *) gspca_dev;
+
         command_pause(gspca_dev);
 
         /* save camera state for later open (developers guide ch 3.5.3) */
@@ -1748,6 +1756,17 @@ static void sd_stopN(struct gspca_dev *gspca_dev)
 
         /* Update the camera status */
         do_command(gspca_dev, CPIA_COMMAND_GetCameraStatus, 0, 0, 0, 0);
+
+#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
+        /* If the last button state is pressed, release it now! */
+        if (sd->params.qx3.button) {
+                /* The camera latch will hold the pressed state until we reset
+                   the latch, so we do not reset sd->params.qx3.button now, to
+                   avoid a false keypress being reported the next sd_start */
+                input_report_key(gspca_dev->input_dev, KEY_CAMERA, 0);
+                input_sync(gspca_dev->input_dev);
+        }
+#endif
 }
 
 /* this function is called at probe and resume time */
@@ -1852,8 +1871,7 @@ static void sd_dq_callback(struct gspca_dev *gspca_dev)
 
         /* Update our knowledge of the camera state */
         do_command(gspca_dev, CPIA_COMMAND_GetExposure, 0, 0, 0, 0);
-        if (sd->params.qx3.qx3_detected)
-                do_command(gspca_dev, CPIA_COMMAND_ReadMCPorts, 0, 0, 0, 0);
+        do_command(gspca_dev, CPIA_COMMAND_ReadMCPorts, 0, 0, 0, 0);
 }
 
 static int sd_setbrightness(struct gspca_dev *gspca_dev, __s32 val)
@@ -2085,6 +2103,9 @@ static const struct sd_desc sd_desc = {
         .dq_callback = sd_dq_callback,
         .pkt_scan = sd_pkt_scan,
         .querymenu = sd_querymenu,
+#if defined(CONFIG_INPUT) || defined(CONFIG_INPUT_MODULE)
+        .other_input = 1,
+#endif
 };
 
 /* -- module initialisation -- */