* - applied all checkpatch.pl v1.12 suggestions
* except the warning about the too long lines with bit comments
* - renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
+ * 2008-01-22 Tobias Lorenz <tobias.lorenz@gmx.net>
+ * Version 1.0.4
+ * - avoid poss. locking when doing copy_to_user which may sleep
+ * - RDS is automatically activated on read now
+ * - code cleaned of unnecessary rds_commands
+ * - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
+ * (thanks to Guillaume RAMOUSSE)
*
* ToDo:
- * - check USB Vendor/Product ID for ADS/Tech FM Radio Receiver
- * (formerly Instant FM Music) (RDX-155-EF) is 06e1:a155
* - add seeking support
* - add firmware download/update support
- * - add possibility to switch off RDS
* - RDS support: interrupt mode, instead of polling
* - add LED status output (check if that's not already done in firmware)
*/
/* driver definitions */
#define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
#define DRIVER_NAME "radio-si470x"
-#define DRIVER_VERSION KERNEL_VERSION(1, 0, 3)
+#define DRIVER_VERSION KERNEL_VERSION(1, 0, 4)
#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
#define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
static struct usb_device_id si470x_usb_driver_id_table[] = {
/* Silicon Labs USB FM Radio Reference Design */
{ USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
+ /* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
+ { USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
/* Terminating entry */
{ }
};
/* RDS poll frequency */
static int rds_poll_time = 40;
/* 40 is used by the original USBRadio.exe */
+/* 50 is used by radio-cadet */
/* 75 should be okay */
/* 80 is the usual RDS receive interval */
module_param(rds_poll_time, int, 0);
/* RDS receive buffer */
struct work_struct work;
+ wait_queue_head_t read_queue;
struct timer_list timer;
spinlock_t lock; /* buffer locking */
- unsigned char *buffer;
+ unsigned char *buffer; /* size is always multiple of three */
unsigned int buf_size;
unsigned int rd_index;
unsigned int wr_index;
- unsigned int block_count;
- unsigned char last_blocknum;
- wait_queue_head_t read_queue;
- int data_available_for_read;
};
return retval;
/* sysconfig 1 */
- radio->registers[SYSCONFIG1] =
- SYSCONFIG1_DE | SYSCONFIG1_RDS;
+ radio->registers[SYSCONFIG1] = SYSCONFIG1_DE;
retval = si470x_set_register(radio, SYSCONFIG1);
if (retval < 0)
return retval;
*/
static int si470x_stop(struct si470x_device *radio)
{
+ int retval;
+
+ /* sysconfig 1 */
+ radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
+ retval = si470x_set_register(radio, SYSCONFIG1);
+ if (retval < 0)
+ return retval;
+
/* powercfg */
radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
/* POWERCFG_ENABLE has to automatically go low */
}
+/*
+ * si470x_rds_on - switch on rds reception
+ */
+static int si470x_rds_on(struct si470x_device *radio)
+{
+ /* sysconfig 1 */
+ radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
+ return si470x_set_register(radio, SYSCONFIG1);
+}
+
+
/**************************************************************************
* RDS Driver Functions
*/
static void si470x_rds(struct si470x_device *radio)
{
- unsigned long flags;
unsigned char tmpbuf[3];
unsigned char blocknum;
- unsigned char bler; /* RDS block errors */
+ unsigned char bler; /* rds block errors */
unsigned short rds;
unsigned int i;
- if (radio->users == 0)
- return;
+ /* get rds blocks */
if (si470x_get_rds_registers(radio) < 0)
return;
if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
return;
}
- for (blocknum = 0; blocknum < 4; blocknum++) {
- switch (blocknum) {
- default:
- bler = (radio->registers[STATUSRSSI] &
- STATUSRSSI_BLERA) >> 9;
- rds = radio->registers[RDSA];
- break;
- case 1:
- bler = (radio->registers[READCHAN] &
- READCHAN_BLERB) >> 14;
- rds = radio->registers[RDSB];
- break;
- case 2:
- bler = (radio->registers[READCHAN] &
- READCHAN_BLERC) >> 12;
- rds = radio->registers[RDSC];
- break;
- case 3:
- bler = (radio->registers[READCHAN] &
- READCHAN_BLERD) >> 10;
- rds = radio->registers[RDSD];
- break;
- };
-
- /* Fill the V4L2 RDS buffer */
- tmpbuf[0] = rds & 0x00ff; /* LSB */
- tmpbuf[1] = (rds & 0xff00) >> 8;/* MSB */
- tmpbuf[2] = blocknum; /* offset name */
- tmpbuf[2] |= blocknum << 3; /* received offset */
- if (bler > max_rds_errors)
- tmpbuf[2] |= 0x80; /* uncorrectable errors */
- else if (bler > 0)
- tmpbuf[2] |= 0x40; /* corrected error(s) */
-
- spin_lock_irqsave(&radio->lock, flags);
-
- /* copy RDS block to internal buffer */
- for (i = 0; i < 3; i++) {
- radio->buffer[radio->wr_index] = tmpbuf[i];
- radio->wr_index++;
+ /* copy four RDS blocks to internal buffer */
+ if (spin_trylock(&radio->lock)) {
+ /* process each rds block */
+ for (blocknum = 0; blocknum < 4; blocknum++) {
+ switch (blocknum) {
+ default:
+ bler = (radio->registers[STATUSRSSI] &
+ STATUSRSSI_BLERA) >> 9;
+ rds = radio->registers[RDSA];
+ break;
+ case 1:
+ bler = (radio->registers[READCHAN] &
+ READCHAN_BLERB) >> 14;
+ rds = radio->registers[RDSB];
+ break;
+ case 2:
+ bler = (radio->registers[READCHAN] &
+ READCHAN_BLERC) >> 12;
+ rds = radio->registers[RDSC];
+ break;
+ case 3:
+ bler = (radio->registers[READCHAN] &
+ READCHAN_BLERD) >> 10;
+ rds = radio->registers[RDSD];
+ break;
+ };
+
+ /* Fill the V4L2 RDS buffer */
+ tmpbuf[0] = rds & 0x00ff; /* LSB */
+ tmpbuf[1] = (rds & 0xff00) >> 8;/* MSB */
+ tmpbuf[2] = blocknum; /* offset name */
+ tmpbuf[2] |= blocknum << 3; /* received offset */
+ if (bler > max_rds_errors)
+ tmpbuf[2] |= 0x80; /* uncorrectable errors */
+ else if (bler > 0)
+ tmpbuf[2] |= 0x40; /* corrected error(s) */
+
+ /* copy RDS block to internal buffer */
+ for (i = 0; i < 3; i++) {
+ radio->buffer[radio->wr_index] = tmpbuf[i];
+ radio->wr_index++;
+ }
+
+ /* wrap write pointer */
+ if (radio->wr_index >= radio->buf_size)
+ radio->wr_index = 0;
+
+ /* check for overflow */
+ if (radio->wr_index == radio->rd_index) {
+ /* increment and wrap read pointer */
+ radio->rd_index += 3;
+ if (radio->rd_index >= radio->buf_size)
+ radio->rd_index = 0;
+ }
}
-
- if (radio->wr_index >= radio->buf_size)
- radio->wr_index = 0;
-
- if (radio->wr_index == radio->rd_index) {
- radio->rd_index += 3;
- if (radio->rd_index >= radio->buf_size)
- radio->rd_index = 0;
- } else
- radio->block_count++;
-
- spin_unlock_irqrestore(&radio->lock, flags);
+ spin_unlock(&radio->lock);
}
- radio->data_available_for_read = 1;
- wake_up_interruptible(&radio->read_queue);
+ /* wake up read queue */
+ if (radio->wr_index != radio->rd_index)
+ wake_up_interruptible(&radio->read_queue);
}
/*
- * si470x_timer - rds work function
+ * si470x_work - rds work function
*/
static void si470x_work(struct work_struct *work)
{
struct si470x_device *radio = container_of(work, struct si470x_device,
work);
- if (radio->users == 0)
+ if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
return;
si470x_rds(radio);
size_t count, loff_t *ppos)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
- struct rds_command cmd;
- unsigned long flags;
- unsigned int i;
- unsigned int rd_blocks;
-
- cmd.block_count = count / 3; /* each RDS block needs 3 bytes */
- cmd.result = 0;
- cmd.buffer = buf;
- cmd.instance = file;
-
- /* copy RDS block out of internal buffer */
- while (!radio->data_available_for_read) {
- if (wait_event_interruptible(radio->read_queue,
- radio->data_available_for_read) < 0)
- return -EINTR;
- }
+ int retval = 0;
+ unsigned int block_count = 0;
- spin_lock_irqsave(&radio->lock, flags);
- rd_blocks = cmd.block_count;
- if (rd_blocks > radio->block_count)
- rd_blocks = radio->block_count;
+ /* switch on rds reception */
+ if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) {
+ si470x_rds_on(radio);
+ schedule_work(&radio->work);
+ }
- if (!rd_blocks) {
- spin_unlock_irqrestore(&radio->lock, flags);
- return cmd.result;
+ /* block if no new data available */
+ while (radio->wr_index == radio->rd_index) {
+ if (file->f_flags & O_NONBLOCK)
+ return -EWOULDBLOCK;
+ interruptible_sleep_on(&radio->read_queue);
}
- for (i = 0; i < rd_blocks; i++) {
- /* copy RDS block to user buffer */
- if (radio->rd_index == radio->wr_index)
- break;
+ /* calculate block count from byte count */
+ count /= 3;
+
+ /* copy RDS block out of internal buffer and to user buffer */
+ if (spin_trylock(&radio->lock)) {
+ while (block_count < count) {
+ if (radio->rd_index == radio->wr_index)
+ break;
- if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
- break;
+ /* always transfer rds complete blocks */
+ if (copy_to_user(buf,
+ &radio->buffer[radio->rd_index], 3))
+ /* retval = -EFAULT; */
+ break;
- radio->rd_index += 3;
- if (radio->rd_index >= radio->buf_size)
- radio->rd_index = 0;
- radio->block_count--;
+ /* increment and wrap read pointer */
+ radio->rd_index += 3;
+ if (radio->rd_index >= radio->buf_size)
+ radio->rd_index = 0;
+
+ /* increment counters */
+ block_count++;
+ buf += 3;
+ retval += 3;
+ }
- buf += 3;
- cmd.result += 3;
+ spin_unlock(&radio->lock);
}
- radio->data_available_for_read = (radio->block_count > 0);
- spin_unlock_irqrestore(&radio->lock, flags);
- return cmd.result;
+ return retval;
}
struct poll_table_struct *pts)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
- int retval;
- retval = 0;
- if (radio->data_available_for_read)
- retval = POLLIN | POLLRDNORM;
+ /* switch on rds reception */
+ if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) {
+ si470x_rds_on(radio);
+ schedule_work(&radio->work);
+ }
+
poll_wait(file, &radio->read_queue, pts);
- return retval;
+ if (radio->rd_index != radio->wr_index)
+ return POLLIN | POLLRDNORM;
+
+ return 0;
}
*/
static int si470x_fops_open(struct inode *inode, struct file *file)
{
- int retval;
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
radio->users++;
- if (radio->users == 1) {
- retval = si470x_start(radio);
- if (retval < 0)
- return retval;
-
- schedule_work(&radio->work);
- }
+ if (radio->users == 1)
+ return si470x_start(radio);
return 0;
}
*/
static int si470x_fops_release(struct inode *inode, struct file *file)
{
- int retval;
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
if (!radio)
radio->users--;
if (radio->users == 0) {
- radio->data_available_for_read = 1; /* ? */
- wake_up_interruptible(&radio->read_queue); /* ? */
+ /* stop rds reception */
+ del_timer_sync(&radio->timer);
+ flush_scheduled_work();
- retval = si470x_stop(radio);
- if (retval < 0)
- return retval;
+ /* cancel read processes */
+ wake_up_interruptible(&radio->read_queue);
+
+ return si470x_stop(radio);
}
return 0;
< RADIO_SW_VERSION_CURRENT)
printk(KERN_WARNING DRIVER_NAME
": This driver is known to work with chip version %d, "
- "but the device has firmware %d. If you have some "
- "trouble using this driver, please report to V4L ML "
- "at video4linux-list@redhat.com\n",
+ "but the device has firmware %d.\n"
+ DRIVER_NAME
+ "If you have some trouble using this driver, please "
+ "report to V4L ML at video4linux-list@redhat.com\n",
radio->registers[CHIPID] & CHIPID_FIRMWARE,
RADIO_SW_VERSION_CURRENT);
kfree(radio);
return -ENOMEM;
}
- radio->block_count = 0;
radio->wr_index = 0;
radio->rd_index = 0;
- radio->last_blocknum = 0xff;
init_waitqueue_head(&radio->read_queue);
- radio->data_available_for_read = 0;
/* prepare polling via eventd */
INIT_WORK(&radio->work, si470x_work);
MODULE_LICENSE("GPL");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
-MODULE_VERSION("1.0.3");
+MODULE_VERSION("1.0.4");
projects / linux-2.6 / commitdiff