forked from Minki/linux
7c0f6ba682
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
529 lines
13 KiB
C
529 lines
13 KiB
C
/*
|
|
Driver for SAA6588 RDS decoder
|
|
|
|
(c) 2005 Hans J. Koch
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/types.h>
|
|
#include <linux/videodev2.h>
|
|
#include <linux/init.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <media/i2c/saa6588.h>
|
|
#include <media/v4l2-device.h>
|
|
|
|
|
|
/* insmod options */
|
|
static unsigned int debug;
|
|
static unsigned int xtal;
|
|
static unsigned int mmbs;
|
|
static unsigned int plvl;
|
|
static unsigned int bufblocks = 100;
|
|
|
|
module_param(debug, int, 0644);
|
|
MODULE_PARM_DESC(debug, "enable debug messages");
|
|
module_param(xtal, int, 0);
|
|
MODULE_PARM_DESC(xtal, "select oscillator frequency (0..3), default 0");
|
|
module_param(mmbs, int, 0);
|
|
MODULE_PARM_DESC(mmbs, "enable MMBS mode: 0=off (default), 1=on");
|
|
module_param(plvl, int, 0);
|
|
MODULE_PARM_DESC(plvl, "select pause level (0..3), default 0");
|
|
module_param(bufblocks, int, 0);
|
|
MODULE_PARM_DESC(bufblocks, "number of buffered blocks, default 100");
|
|
|
|
MODULE_DESCRIPTION("v4l2 driver module for SAA6588 RDS decoder");
|
|
MODULE_AUTHOR("Hans J. Koch <koch@hjk-az.de>");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
#define UNSET (-1U)
|
|
#define PREFIX "saa6588: "
|
|
#define dprintk if (debug) printk
|
|
|
|
struct saa6588 {
|
|
struct v4l2_subdev sd;
|
|
struct delayed_work work;
|
|
spinlock_t lock;
|
|
unsigned char *buffer;
|
|
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;
|
|
u8 sync;
|
|
};
|
|
|
|
static inline struct saa6588 *to_saa6588(struct v4l2_subdev *sd)
|
|
{
|
|
return container_of(sd, struct saa6588, sd);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* SAA6588 defines
|
|
*/
|
|
|
|
/* Initialization and mode control byte (0w) */
|
|
|
|
/* bit 0+1 (DAC0/DAC1) */
|
|
#define cModeStandard 0x00
|
|
#define cModeFastPI 0x01
|
|
#define cModeReducedRequest 0x02
|
|
#define cModeInvalid 0x03
|
|
|
|
/* bit 2 (RBDS) */
|
|
#define cProcessingModeRDS 0x00
|
|
#define cProcessingModeRBDS 0x04
|
|
|
|
/* bit 3+4 (SYM0/SYM1) */
|
|
#define cErrCorrectionNone 0x00
|
|
#define cErrCorrection2Bits 0x08
|
|
#define cErrCorrection5Bits 0x10
|
|
#define cErrCorrectionNoneRBDS 0x18
|
|
|
|
/* bit 5 (NWSY) */
|
|
#define cSyncNormal 0x00
|
|
#define cSyncRestart 0x20
|
|
|
|
/* bit 6 (TSQD) */
|
|
#define cSigQualityDetectOFF 0x00
|
|
#define cSigQualityDetectON 0x40
|
|
|
|
/* bit 7 (SQCM) */
|
|
#define cSigQualityTriggered 0x00
|
|
#define cSigQualityContinous 0x80
|
|
|
|
/* Pause level and flywheel control byte (1w) */
|
|
|
|
/* bits 0..5 (FEB0..FEB5) */
|
|
#define cFlywheelMaxBlocksMask 0x3F
|
|
#define cFlywheelDefault 0x20
|
|
|
|
/* bits 6+7 (PL0/PL1) */
|
|
#define cPauseLevel_11mV 0x00
|
|
#define cPauseLevel_17mV 0x40
|
|
#define cPauseLevel_27mV 0x80
|
|
#define cPauseLevel_43mV 0xC0
|
|
|
|
/* Pause time/oscillator frequency/quality detector control byte (1w) */
|
|
|
|
/* bits 0..4 (SQS0..SQS4) */
|
|
#define cQualityDetectSensMask 0x1F
|
|
#define cQualityDetectDefault 0x0F
|
|
|
|
/* bit 5 (SOSC) */
|
|
#define cSelectOscFreqOFF 0x00
|
|
#define cSelectOscFreqON 0x20
|
|
|
|
/* bit 6+7 (PTF0/PTF1) */
|
|
#define cOscFreq_4332kHz 0x00
|
|
#define cOscFreq_8664kHz 0x40
|
|
#define cOscFreq_12996kHz 0x80
|
|
#define cOscFreq_17328kHz 0xC0
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static bool block_from_buf(struct saa6588 *s, unsigned char *buf)
|
|
{
|
|
int i;
|
|
|
|
if (s->rd_index == s->wr_index) {
|
|
if (debug > 2)
|
|
dprintk(PREFIX "Read: buffer empty.\n");
|
|
return false;
|
|
}
|
|
|
|
if (debug > 2) {
|
|
dprintk(PREFIX "Read: ");
|
|
for (i = s->rd_index; i < s->rd_index + 3; i++)
|
|
dprintk("0x%02x ", s->buffer[i]);
|
|
}
|
|
|
|
memcpy(buf, &s->buffer[s->rd_index], 3);
|
|
|
|
s->rd_index += 3;
|
|
if (s->rd_index >= s->buf_size)
|
|
s->rd_index = 0;
|
|
s->block_count--;
|
|
|
|
if (debug > 2)
|
|
dprintk("%d blocks total.\n", s->block_count);
|
|
|
|
return true;
|
|
}
|
|
|
|
static void read_from_buf(struct saa6588 *s, struct saa6588_command *a)
|
|
{
|
|
unsigned char __user *buf_ptr = a->buffer;
|
|
unsigned char buf[3];
|
|
unsigned long flags;
|
|
unsigned int rd_blocks;
|
|
unsigned int i;
|
|
|
|
a->result = 0;
|
|
if (!a->buffer)
|
|
return;
|
|
|
|
while (!a->nonblocking && !s->data_available_for_read) {
|
|
int ret = wait_event_interruptible(s->read_queue,
|
|
s->data_available_for_read);
|
|
if (ret == -ERESTARTSYS) {
|
|
a->result = -EINTR;
|
|
return;
|
|
}
|
|
}
|
|
|
|
rd_blocks = a->block_count;
|
|
spin_lock_irqsave(&s->lock, flags);
|
|
if (rd_blocks > s->block_count)
|
|
rd_blocks = s->block_count;
|
|
spin_unlock_irqrestore(&s->lock, flags);
|
|
|
|
if (!rd_blocks)
|
|
return;
|
|
|
|
for (i = 0; i < rd_blocks; i++) {
|
|
bool got_block;
|
|
|
|
spin_lock_irqsave(&s->lock, flags);
|
|
got_block = block_from_buf(s, buf);
|
|
spin_unlock_irqrestore(&s->lock, flags);
|
|
if (!got_block)
|
|
break;
|
|
if (copy_to_user(buf_ptr, buf, 3)) {
|
|
a->result = -EFAULT;
|
|
return;
|
|
}
|
|
buf_ptr += 3;
|
|
a->result += 3;
|
|
}
|
|
spin_lock_irqsave(&s->lock, flags);
|
|
s->data_available_for_read = (s->block_count > 0);
|
|
spin_unlock_irqrestore(&s->lock, flags);
|
|
}
|
|
|
|
static void block_to_buf(struct saa6588 *s, unsigned char *blockbuf)
|
|
{
|
|
unsigned int i;
|
|
|
|
if (debug > 3)
|
|
dprintk(PREFIX "New block: ");
|
|
|
|
for (i = 0; i < 3; ++i) {
|
|
if (debug > 3)
|
|
dprintk("0x%02x ", blockbuf[i]);
|
|
s->buffer[s->wr_index] = blockbuf[i];
|
|
s->wr_index++;
|
|
}
|
|
|
|
if (s->wr_index >= s->buf_size)
|
|
s->wr_index = 0;
|
|
|
|
if (s->wr_index == s->rd_index) {
|
|
s->rd_index += 3;
|
|
if (s->rd_index >= s->buf_size)
|
|
s->rd_index = 0;
|
|
} else
|
|
s->block_count++;
|
|
|
|
if (debug > 3)
|
|
dprintk("%d blocks total.\n", s->block_count);
|
|
}
|
|
|
|
static void saa6588_i2c_poll(struct saa6588 *s)
|
|
{
|
|
struct i2c_client *client = v4l2_get_subdevdata(&s->sd);
|
|
unsigned long flags;
|
|
unsigned char tmpbuf[6];
|
|
unsigned char blocknum;
|
|
unsigned char tmp;
|
|
|
|
/* Although we only need 3 bytes, we have to read at least 6.
|
|
SAA6588 returns garbage otherwise. */
|
|
if (6 != i2c_master_recv(client, &tmpbuf[0], 6)) {
|
|
if (debug > 1)
|
|
dprintk(PREFIX "read error!\n");
|
|
return;
|
|
}
|
|
|
|
s->sync = tmpbuf[0] & 0x10;
|
|
if (!s->sync)
|
|
return;
|
|
blocknum = tmpbuf[0] >> 5;
|
|
if (blocknum == s->last_blocknum) {
|
|
if (debug > 3)
|
|
dprintk("Saw block %d again.\n", blocknum);
|
|
return;
|
|
}
|
|
|
|
s->last_blocknum = blocknum;
|
|
|
|
/*
|
|
Byte order according to v4l2 specification:
|
|
|
|
Byte 0: Least Significant Byte of RDS Block
|
|
Byte 1: Most Significant Byte of RDS Block
|
|
Byte 2 Bit 7: Error bit. Indicates that an uncorrectable error
|
|
occurred during reception of this block.
|
|
Bit 6: Corrected bit. Indicates that an error was
|
|
corrected for this data block.
|
|
Bits 5-3: Same as bits 0-2.
|
|
Bits 2-0: Block number.
|
|
|
|
SAA6588 byte order is Status-MSB-LSB, so we have to swap the
|
|
first and the last of the 3 bytes block.
|
|
*/
|
|
|
|
swap(tmpbuf[2], tmpbuf[0]);
|
|
|
|
/* Map 'Invalid block E' to 'Invalid Block' */
|
|
if (blocknum == 6)
|
|
blocknum = V4L2_RDS_BLOCK_INVALID;
|
|
/* And if are not in mmbs mode, then 'Block E' is also mapped
|
|
to 'Invalid Block'. As far as I can tell MMBS is discontinued,
|
|
and if there is ever a need to support E blocks, then please
|
|
contact the linux-media mailinglist. */
|
|
else if (!mmbs && blocknum == 5)
|
|
blocknum = V4L2_RDS_BLOCK_INVALID;
|
|
tmp = blocknum;
|
|
tmp |= blocknum << 3; /* Received offset == Offset Name (OK ?) */
|
|
if ((tmpbuf[2] & 0x03) == 0x03)
|
|
tmp |= V4L2_RDS_BLOCK_ERROR; /* uncorrectable error */
|
|
else if ((tmpbuf[2] & 0x03) != 0x00)
|
|
tmp |= V4L2_RDS_BLOCK_CORRECTED; /* corrected error */
|
|
tmpbuf[2] = tmp; /* Is this enough ? Should we also check other bits ? */
|
|
|
|
spin_lock_irqsave(&s->lock, flags);
|
|
block_to_buf(s, tmpbuf);
|
|
spin_unlock_irqrestore(&s->lock, flags);
|
|
s->data_available_for_read = 1;
|
|
wake_up_interruptible(&s->read_queue);
|
|
}
|
|
|
|
static void saa6588_work(struct work_struct *work)
|
|
{
|
|
struct saa6588 *s = container_of(work, struct saa6588, work.work);
|
|
|
|
saa6588_i2c_poll(s);
|
|
schedule_delayed_work(&s->work, msecs_to_jiffies(20));
|
|
}
|
|
|
|
static void saa6588_configure(struct saa6588 *s)
|
|
{
|
|
struct i2c_client *client = v4l2_get_subdevdata(&s->sd);
|
|
unsigned char buf[3];
|
|
int rc;
|
|
|
|
buf[0] = cSyncRestart;
|
|
if (mmbs)
|
|
buf[0] |= cProcessingModeRBDS;
|
|
|
|
buf[1] = cFlywheelDefault;
|
|
switch (plvl) {
|
|
case 0:
|
|
buf[1] |= cPauseLevel_11mV;
|
|
break;
|
|
case 1:
|
|
buf[1] |= cPauseLevel_17mV;
|
|
break;
|
|
case 2:
|
|
buf[1] |= cPauseLevel_27mV;
|
|
break;
|
|
case 3:
|
|
buf[1] |= cPauseLevel_43mV;
|
|
break;
|
|
default: /* nothing */
|
|
break;
|
|
}
|
|
|
|
buf[2] = cQualityDetectDefault | cSelectOscFreqON;
|
|
|
|
switch (xtal) {
|
|
case 0:
|
|
buf[2] |= cOscFreq_4332kHz;
|
|
break;
|
|
case 1:
|
|
buf[2] |= cOscFreq_8664kHz;
|
|
break;
|
|
case 2:
|
|
buf[2] |= cOscFreq_12996kHz;
|
|
break;
|
|
case 3:
|
|
buf[2] |= cOscFreq_17328kHz;
|
|
break;
|
|
default: /* nothing */
|
|
break;
|
|
}
|
|
|
|
dprintk(PREFIX "writing: 0w=0x%02x 1w=0x%02x 2w=0x%02x\n",
|
|
buf[0], buf[1], buf[2]);
|
|
|
|
rc = i2c_master_send(client, buf, 3);
|
|
if (rc != 3)
|
|
printk(PREFIX "i2c i/o error: rc == %d (should be 3)\n", rc);
|
|
}
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static long saa6588_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
|
|
{
|
|
struct saa6588 *s = to_saa6588(sd);
|
|
struct saa6588_command *a = arg;
|
|
|
|
switch (cmd) {
|
|
/* --- close() for /dev/radio --- */
|
|
case SAA6588_CMD_CLOSE:
|
|
s->data_available_for_read = 1;
|
|
wake_up_interruptible(&s->read_queue);
|
|
s->data_available_for_read = 0;
|
|
a->result = 0;
|
|
break;
|
|
/* --- read() for /dev/radio --- */
|
|
case SAA6588_CMD_READ:
|
|
read_from_buf(s, a);
|
|
break;
|
|
/* --- poll() for /dev/radio --- */
|
|
case SAA6588_CMD_POLL:
|
|
a->result = 0;
|
|
if (s->data_available_for_read)
|
|
a->result |= POLLIN | POLLRDNORM;
|
|
poll_wait(a->instance, &s->read_queue, a->event_list);
|
|
break;
|
|
|
|
default:
|
|
/* nothing */
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int saa6588_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *vt)
|
|
{
|
|
struct saa6588 *s = to_saa6588(sd);
|
|
|
|
vt->capability |= V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO;
|
|
if (s->sync)
|
|
vt->rxsubchans |= V4L2_TUNER_SUB_RDS;
|
|
return 0;
|
|
}
|
|
|
|
static int saa6588_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *vt)
|
|
{
|
|
struct saa6588 *s = to_saa6588(sd);
|
|
|
|
saa6588_configure(s);
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static const struct v4l2_subdev_core_ops saa6588_core_ops = {
|
|
.ioctl = saa6588_ioctl,
|
|
};
|
|
|
|
static const struct v4l2_subdev_tuner_ops saa6588_tuner_ops = {
|
|
.g_tuner = saa6588_g_tuner,
|
|
.s_tuner = saa6588_s_tuner,
|
|
};
|
|
|
|
static const struct v4l2_subdev_ops saa6588_ops = {
|
|
.core = &saa6588_core_ops,
|
|
.tuner = &saa6588_tuner_ops,
|
|
};
|
|
|
|
/* ---------------------------------------------------------------------- */
|
|
|
|
static int saa6588_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct saa6588 *s;
|
|
struct v4l2_subdev *sd;
|
|
|
|
v4l_info(client, "saa6588 found @ 0x%x (%s)\n",
|
|
client->addr << 1, client->adapter->name);
|
|
|
|
s = devm_kzalloc(&client->dev, sizeof(*s), GFP_KERNEL);
|
|
if (s == NULL)
|
|
return -ENOMEM;
|
|
|
|
s->buf_size = bufblocks * 3;
|
|
|
|
s->buffer = devm_kzalloc(&client->dev, s->buf_size, GFP_KERNEL);
|
|
if (s->buffer == NULL)
|
|
return -ENOMEM;
|
|
sd = &s->sd;
|
|
v4l2_i2c_subdev_init(sd, client, &saa6588_ops);
|
|
spin_lock_init(&s->lock);
|
|
s->block_count = 0;
|
|
s->wr_index = 0;
|
|
s->rd_index = 0;
|
|
s->last_blocknum = 0xff;
|
|
init_waitqueue_head(&s->read_queue);
|
|
s->data_available_for_read = 0;
|
|
|
|
saa6588_configure(s);
|
|
|
|
/* start polling via eventd */
|
|
INIT_DELAYED_WORK(&s->work, saa6588_work);
|
|
schedule_delayed_work(&s->work, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int saa6588_remove(struct i2c_client *client)
|
|
{
|
|
struct v4l2_subdev *sd = i2c_get_clientdata(client);
|
|
struct saa6588 *s = to_saa6588(sd);
|
|
|
|
v4l2_device_unregister_subdev(sd);
|
|
|
|
cancel_delayed_work_sync(&s->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static const struct i2c_device_id saa6588_id[] = {
|
|
{ "saa6588", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, saa6588_id);
|
|
|
|
static struct i2c_driver saa6588_driver = {
|
|
.driver = {
|
|
.name = "saa6588",
|
|
},
|
|
.probe = saa6588_probe,
|
|
.remove = saa6588_remove,
|
|
.id_table = saa6588_id,
|
|
};
|
|
|
|
module_i2c_driver(saa6588_driver);
|