V4L/DVB (7997): si470x: hardware frequency seek support

This patch brings the following changes:
- this now finally adds hardware frequency seek support

Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/radio/radio-si470x.c b/drivers/media/radio/radio-si470x.c
index db9d64a228bb607eac9347617709442aa874aa35..dc93a882b38595114169bb575820cf023155a460 100644 (file)
--- a/drivers/media/radio/radio-si470x.c
+++ b/drivers/media/radio/radio-si470x.c
@@ -101,11 +101,11 @@
  *             - unplugging fixed
  * 2008-05-07  Tobias Lorenz <tobias.lorenz@gmx.net>
  *             Version 1.0.8
+ *             - hardware frequency seek support
  *             - afc indication
  *             - more safety checks, let si470x_get_freq return errno
  *
  * ToDo:
- * - add seeking support
  * - add firmware download/update support
  * - RDS support: interrupt mode, instead of polling
  * - add LED status output (check if that's not already done in firmware)
@@ -192,6 +192,11 @@ static unsigned int tune_timeout = 3000;
 module_param(tune_timeout, uint, 0);
 MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");
 
+/* Seek timeout */
+static unsigned int seek_timeout = 5000;
+module_param(seek_timeout, uint, 0);
+MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");
+
 /* RDS buffer blocks */
 static unsigned int rds_buf = 100;
 module_param(rds_buf, uint, 0);
@@ -726,6 +731,62 @@ static int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
 }
 
 
+/*
+ * si470x_set_seek - set seek
+ */
+static int si470x_set_seek(struct si470x_device *radio,
+               unsigned int wrap_around, unsigned int seek_upward)
+{
+       int retval = 0;
+       unsigned long timeout;
+       bool timed_out = 0;
+
+       /* start seeking */
+       radio->registers[POWERCFG] |= POWERCFG_SEEK;
+       if (wrap_around == 1)
+               radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
+       else
+               radio->registers[POWERCFG] |= POWERCFG_SKMODE;
+       if (seek_upward == 1)
+               radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
+       else
+               radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
+       retval = si470x_set_register(radio, POWERCFG);
+       if (retval < 0)
+               goto done;
+
+       /* wait till seek operation has completed */
+       timeout = jiffies + msecs_to_jiffies(seek_timeout);
+       do {
+               retval = si470x_get_register(radio, STATUSRSSI);
+               if (retval < 0)
+                       goto stop;
+               timed_out = time_after(jiffies, timeout);
+       } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
+               (!timed_out));
+       if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
+               printk(KERN_WARNING DRIVER_NAME ": seek does not complete\n");
+       if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
+               printk(KERN_WARNING DRIVER_NAME
+                       ": seek failed / band limit reached\n");
+       if (timed_out)
+               printk(KERN_WARNING DRIVER_NAME
+                       ": seek timed out after %u ms\n", seek_timeout);
+
+stop:
+       /* stop seeking */
+       radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
+       retval = si470x_set_register(radio, POWERCFG);
+
+done:
+       /* try again, if timed out */
+       if ((retval == 0) && timed_out)
+               retval = -EAGAIN;
+
+       return retval;
+}
+
+
 /*
  * si470x_start - switch on radio
  */
@@ -1148,7 +1209,8 @@ static int si470x_vidioc_querycap(struct file *file, void *priv,
        strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
        sprintf(capability->bus_info, "USB");
        capability->version = DRIVER_KERNEL_VERSION;
-       capability->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
+       capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
+               V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 
        return 0;
 }
@@ -1494,6 +1556,36 @@ done:
 }
 
 
+/*
+ * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
+ */
+static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
+               struct v4l2_hw_freq_seek *seek)
+{
+       struct si470x_device *radio = video_get_drvdata(video_devdata(file));
+       int retval = 0;
+
+       /* safety checks */
+       if (radio->disconnected) {
+               retval = -EIO;
+               goto done;
+       }
+       if ((seek->tuner != 0) && (seek->type != V4L2_TUNER_RADIO)) {
+               retval = -EINVAL;
+               goto done;
+       }
+
+       retval = si470x_set_seek(radio, seek->wrap_around, seek->seek_upward);
+
+done:
+       if (retval < 0)
+               printk(KERN_WARNING DRIVER_NAME
+                       ": set hardware frequency seek failed with %d\n",
+                       retval);
+       return retval;
+}
+
+
 /*
  * si470x_viddev_tamples - video device interface
  */
@@ -1514,6 +1606,7 @@ static struct video_device si470x_viddev_template = {
        .vidioc_s_tuner         = si470x_vidioc_s_tuner,
        .vidioc_g_frequency     = si470x_vidioc_g_frequency,
        .vidioc_s_frequency     = si470x_vidioc_s_frequency,
+       .vidioc_s_hw_freq_seek  = si470x_vidioc_s_hw_freq_seek,
        .owner                  = THIS_MODULE,
 };