This patch is to support RDS on si470x i2c driver. The routine of RDS
operation is almost same with thing of usb driver, but this uses RDS
interrupt.
Signed-off-by: Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>
---
drivers/media/radio/si470x/radio-si470x-i2c.c | 159 +++++++++++++++++++++++--
drivers/media/radio/si470x/radio-si470x.h | 1 +
2 files changed, 152 insertions(+), 8 deletions(-)
diff --git a/drivers/media/radio/si470x/radio-si470x-i2c.c b/drivers/media/radio/si470x/radio-si470x-i2c.c
index 4816a6d..77532e6 100644
--- a/drivers/media/radio/si470x/radio-si470x-i2c.c
+++ b/drivers/media/radio/si470x/radio-si470x-i2c.c
@@ -22,22 +22,17 @@
*/
-/*
- * ToDo:
- * - RDS support
- */
-
-
/* driver definitions */
#define DRIVER_AUTHOR "Joonyoung Shim <jy0922.shim@xxxxxxxxxxx>";
-#define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 0)
+#define DRIVER_KERNEL_VERSION KERNEL_VERSION(1, 0, 1)
#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
#define DRIVER_DESC "I2C radio driver for Si470x FM Radio Receivers"
-#define DRIVER_VERSION "1.0.0"
+#define DRIVER_VERSION "1.0.1"
/* kernel includes */
#include <linux/i2c.h>
#include <linux/delay.h>
+#include <linux/interrupt.h>
#include "radio-si470x.h"
@@ -62,6 +57,20 @@ static int radio_nr = -1;
module_param(radio_nr, int, 0444);
MODULE_PARM_DESC(radio_nr, "Radio Nr");
+/* RDS buffer blocks */
+static unsigned int rds_buf = 100;
+module_param(rds_buf, uint, 0444);
+MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
+
+/* RDS maximum block errors */
+static unsigned short max_rds_errors = 1;
+/* 0 means 0 errors requiring correction */
+/* 1 means 1-2 errors requiring correction (used by original USBRadio.exe) */
+/* 2 means 3-5 errors requiring correction */
+/* 3 means 6+ errors or errors in checkword, correction not possible */
+module_param(max_rds_errors, ushort, 0644);
+MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
+
/**************************************************************************
@@ -242,6 +251,105 @@ int si470x_vidioc_querycap(struct file *file, void *priv,
**************************************************************************/
/*
+ * si470x_i2c_interrupt_work - rds processing function
+ */
+static void si470x_i2c_interrupt_work(struct work_struct *work)
+{
+ struct si470x_device *radio = container_of(work,
+ struct si470x_device, radio_work);
+ unsigned char regnr;
+ unsigned char blocknum;
+ unsigned short bler; /* rds block errors */
+ unsigned short rds;
+ unsigned char tmpbuf[3];
+ int retval = 0;
+
+ /* safety checks */
+ if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
+ return;
+
+ /* Update RDS registers */
+ for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++) {
+ retval = si470x_get_register(radio, STATUSRSSI + regnr);
+ if (retval < 0)
+ return;
+ }
+
+ /* get rds blocks */
+ if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0)
+ /* No RDS group ready, better luck next time */
+ 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 */
+ put_unaligned_le16(rds, &tmpbuf);
+ 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 */
+ memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
+ radio->wr_index += 3;
+
+ /* 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->rd_index)
+ wake_up_interruptible(&radio->read_queue);
+}
+
+
+/*
+ * si470x_i2c_interrupt - interrupt handler
+ */
+static irqreturn_t si470x_i2c_interrupt(int irq, void *dev_id)
+{
+ struct si470x_device *radio = dev_id;
+
+ if (!work_pending(&radio->radio_work))
+ schedule_work(&radio->radio_work);
+
+ return IRQ_HANDLED;
+}
+
+
+/*
* si470x_i2c_probe - probe for the device
*/
static int __devinit si470x_i2c_probe(struct i2c_client *client,
@@ -257,6 +365,8 @@ static int __devinit si470x_i2c_probe(struct i2c_client *client,
retval = -ENOMEM;
goto err_initial;
}
+
+ INIT_WORK(&radio->radio_work, si470x_i2c_interrupt_work);
radio->users = 0;
radio->client = client;
mutex_init(&radio->lock);
@@ -308,6 +418,34 @@ static int __devinit si470x_i2c_probe(struct i2c_client *client,
/* set initial frequency */
si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
+ /* rds buffer allocation */
+ radio->buf_size = rds_buf * 3;
+ radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
+ if (!radio->buffer) {
+ retval = -EIO;
+ goto err_video;
+ }
+
+ /* rds buffer configuration */
+ radio->wr_index = 0;
+ radio->rd_index = 0;
+ init_waitqueue_head(&radio->read_queue);
+
+ /* enable RDS interrupt */
+ radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDSIEN;
+ radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_GPIO2;
+ radio->registers[SYSCONFIG1] |= 0x1 << 2;
+ retval = si470x_set_register(radio, SYSCONFIG1);
+ if (retval < 0)
+ goto err_rds;
+
+ retval = request_irq(client->irq, si470x_i2c_interrupt,
+ IRQF_TRIGGER_FALLING, DRIVER_NAME, radio);
+ if (retval) {
+ dev_err(&client->dev, "Failed to register interrupt\n");
+ goto err_rds;
+ }
+
/* register video device */
retval = video_register_device(radio->videodev, VFL_TYPE_RADIO,
radio_nr);
@@ -319,6 +457,9 @@ static int __devinit si470x_i2c_probe(struct i2c_client *client,
return 0;
err_all:
+ free_irq(client->irq, radio);
+err_rds:
+ kfree(radio->buffer);
err_video:
video_device_release(radio->videodev);
err_radio:
@@ -335,6 +476,8 @@ static __devexit int si470x_i2c_remove(struct i2c_client *client)
{
struct si470x_device *radio = i2c_get_clientdata(client);
+ free_irq(client->irq, radio);
+ cancel_work_sync(&radio->radio_work);
video_unregister_device(radio->videodev);
kfree(radio);
i2c_set_clientdata(client, NULL);
diff --git a/drivers/media/radio/si470x/radio-si470x.h b/drivers/media/radio/si470x/radio-si470x.h
index f646f79..29e05cf 100644
--- a/drivers/media/radio/si470x/radio-si470x.h
+++ b/drivers/media/radio/si470x/radio-si470x.h
@@ -181,6 +181,7 @@ struct si470x_device {
#if defined(CONFIG_I2C_SI470X) || defined(CONFIG_I2C_SI470X_MODULE)
struct i2c_client *client;
+ struct work_struct radio_work;
#endif
};
--
1.6.0.4
--
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