V4L/DVB (8123): Add support for em2860 based PointNix Intra-Oral Camera

em28xx-cards.c
em28xx-input.c
em28xx-video.c
em28xx.h
 - Add support for the PointNix Intra-Oral Camera, which required addition of
   a construct for reading the "snapshot" button (provided on the em2860 and
   em2880 chips, but this is the first case where I have seen it actually used
   in a product). The button is wired to pin 56 on the em2880.

   http://www.pointnix.com/ENG/dental/product_02.asp

   Thanks to Roberto Mantovani <rmantovani@libero.it> for testing the changes

Signed-off-by: Devin Heitmueller <devin.heitmueller@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

4 files changed, 117 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index 938c51e1c86d..05f0d5a15058 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -426,6 +426,19 @@ struct em28xx_board em28xx_boards[] = {
                         .amux     = EM28XX_AMUX_LINE_IN,
                 } },
         },
+        [EM2860_BOARD_POINTNIX_INTRAORAL_CAMERA] = {
+                .name         = "PointNix Intra-Oral Camera",
+                .has_snapshot_button = 1,
+                .vchannels    = 1,
+                .tda9887_conf = TDA9887_PRESENT,
+                .tuner_type   = TUNER_ABSENT,
+                .decoder      = EM28XX_SAA7113,
+                .input          = { {
+                        .type     = EM28XX_VMUX_SVIDEO,
+                        .vmux     = SAA7115_SVIDEO3,
+                        .amux     = 0,
+                } },
+        },
 };
 const unsigned int em28xx_bcount = ARRAY_SIZE(em28xx_boards);
 
@@ -522,6 +535,7 @@ static struct em28xx_hash_table em28xx_eeprom_hash [] = {
 static struct em28xx_hash_table em28xx_i2c_hash[] = {
         {0xb06a32c3, EM2800_BOARD_TERRATEC_CINERGY_200, TUNER_LG_PAL_NEW_TAPC},
         {0xf51200e3, EM2800_BOARD_VGEAR_POCKETTV, TUNER_LG_PAL_NEW_TAPC},
+        {0x1ba50080, EM2860_BOARD_POINTNIX_INTRAORAL_CAMERA, TUNER_ABSENT},
 };
 
 int em28xx_tuner_callback(void *ptr, int command, int arg)
@@ -554,6 +568,7 @@ static void em28xx_set_model(struct em28xx *dev)
         dev->has_12mhz_i2s = em28xx_boards[dev->model].has_12mhz_i2s;
         dev->max_range_640_480 = em28xx_boards[dev->model].max_range_640_480;
         dev->has_dvb = em28xx_boards[dev->model].has_dvb;
+        dev->has_snapshot_button = em28xx_boards[dev->model].has_snapshot_button;
 }
 
 /* Since em28xx_pre_card_setup() requires a proper dev->model,
@@ -841,6 +856,9 @@ void em28xx_card_setup(struct em28xx *dev)
                         em28xx_set_model(dev);
         }
 
+        if (dev->has_snapshot_button)
+                em28xx_register_snapshot_button(dev);
+
         /* Allow override tuner type by a module parameter */
         if (tuner >= 0)
                 dev->tuner_type = tuner;
diff --git a/drivers/media/video/em28xx/em28xx-input.c b/drivers/media/video/em28xx/em28xx-input.c
index bb5807159b8d..eab3d9511af3 100644
--- a/drivers/media/video/em28xx/em28xx-input.c
+++ b/drivers/media/video/em28xx/em28xx-input.c
@@ -30,6 +30,10 @@
 
 #include "em28xx.h"
 
+#define EM28XX_SNAPSHOT_KEY KEY_CAMERA
+#define EM28XX_SBUTTON_QUERY_INTERVAL 500
+#define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
+
 static unsigned int ir_debug;
 module_param(ir_debug, int, 0644);
 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
@@ -124,6 +128,89 @@ int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
         return 1;
 }
 
+static void em28xx_query_sbutton(struct work_struct *work)
+{
+        /* Poll the register and see if the button is depressed */
+        struct em28xx *dev =
+                container_of(work, struct em28xx, sbutton_query_work.work);
+        int ret;
+
+        ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
+
+        if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
+                u8 cleared;
+                /* Button is depressed, clear the register */
+                cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
+                em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
+
+                /* Not emulate the keypress */
+                input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
+                                 1);
+                /* Now unpress the key */
+                input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
+                                 0);
+        }
+
+        /* Schedule next poll */
+        schedule_delayed_work(&dev->sbutton_query_work,
+                              msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
+}
+
+void em28xx_register_snapshot_button(struct em28xx *dev)
+{
+        struct input_dev *input_dev;
+        int err;
+
+        em28xx_info("Registering snapshot button...\n");
+        input_dev = input_allocate_device();
+        if (!input_dev) {
+                em28xx_errdev("input_allocate_device failed\n");
+                return;
+        }
+
+        usb_make_path(dev->udev, dev->snapshot_button_path,
+                      sizeof(dev->snapshot_button_path));
+        strlcat(dev->snapshot_button_path, "/sbutton",
+                sizeof(dev->snapshot_button_path));
+        INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
+
+        input_dev->name = "em28xx snapshot button";
+        input_dev->phys = dev->snapshot_button_path;
+        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
+        set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
+        input_dev->keycodesize = 0;
+        input_dev->keycodemax = 0;
+        input_dev->id.bustype = BUS_USB;
+        input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
+        input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
+        input_dev->id.version = 1;
+        input_dev->dev.parent = &dev->udev->dev;
+
+        err = input_register_device(input_dev);
+        if (err) {
+                em28xx_errdev("input_register_device failed\n");
+                input_free_device(input_dev);
+                return;
+        }
+
+        dev->sbutton_input_dev = input_dev;
+        schedule_delayed_work(&dev->sbutton_query_work,
+                              msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
+        return;
+
+}
+
+void em28xx_deregister_snapshot_button(struct em28xx *dev)
+{
+        if (dev->sbutton_input_dev != NULL) {
+                em28xx_info("Deregistering snapshot button\n");
+                cancel_rearming_delayed_work(&dev->sbutton_query_work);
+                input_unregister_device(dev->sbutton_input_dev);
+                dev->sbutton_input_dev = NULL;
+        }
+        return;
+}
+
 /* ----------------------------------------------------------------------
  * Local variables:
  * c-basic-offset: 8
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 1c3e8b6291ea..2d9f14d2a00b 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -1590,6 +1590,8 @@ static void em28xx_release_resources(struct em28xx *dev)
                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
         list_del(&dev->devlist);
+        if (dev->sbutton_input_dev)
+                em28xx_deregister_snapshot_button(dev);
         if (dev->radio_dev) {
                 if (-1 != dev->radio_dev->minor)
                         video_unregister_device(dev->radio_dev);
diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h
index cff618b2d13c..89842c5d64a1 100644
--- a/drivers/media/video/em28xx/em28xx.h
+++ b/drivers/media/video/em28xx/em28xx.h
@@ -57,6 +57,7 @@
 #define EM2880_BOARD_HAUPPAUGE_WINTV_HVR_950    16
 #define EM2880_BOARD_PINNACLE_PCTV_HD_PRO       17
 #define EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900_R2 18
+#define EM2860_BOARD_POINTNIX_INTRAORAL_CAMERA  19
 
 /* Limits minimum and default number of buffers */
 #define EM28XX_MIN_BUF 4
@@ -249,6 +250,7 @@ struct em28xx_board {
         unsigned int has_12mhz_i2s:1;
         unsigned int max_range_640_480:1;
         unsigned int has_dvb:1;
+        unsigned int has_snapshot_button:1;
 
         enum em28xx_decoder decoder;
 
@@ -328,6 +330,7 @@ struct em28xx {
         unsigned int has_12mhz_i2s:1;
         unsigned int max_range_640_480:1;
         unsigned int has_dvb:1;
+        unsigned int has_snapshot_button:1;
 
         /* Some older em28xx chips needs a waiting time after writing */
         unsigned int wait_after_write;
@@ -418,6 +421,11 @@ struct em28xx {
         /* Caches GPO and GPIO registers */
         unsigned char   reg_gpo, reg_gpio;
 
+        /* Snapshot button */
+        char snapshot_button_path[30];  /* path of the input dev */
+        struct input_dev *sbutton_input_dev;
+        struct delayed_work sbutton_query_work;
+
         struct em28xx_dvb *dvb;
 };
 
@@ -483,6 +491,8 @@ int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw);
 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw);
 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
                                      u32 *ir_raw);
+void em28xx_register_snapshot_button(struct em28xx *dev);
+void em28xx_deregister_snapshot_button(struct em28xx *dev);
 
 /* printk macros */