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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>
This commit is contained in:
Tobias Lorenz 2008-05-31 15:11:32 -03:00 committed by Mauro Carvalho Chehab
parent ace7d4bbe6
commit bbc8995f9f
1 changed files with 95 additions and 2 deletions
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97
drivers/media/radio/radio-si470x.c
View File

@ -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,
};