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linux/drivers/media/i2c/saa6588.c
Linus Torvalds a9a08845e9 vfs: do bulk POLL* -> EPOLL* replacement 
This is the mindless scripted replacement of kernel use of POLL*
variables as described by Al, done by this script:

    for V in IN OUT PRI ERR RDNORM RDBAND WRNORM WRBAND HUP RDHUP NVAL MSG; do
        L=`git grep -l -w POLL$V | grep -v '^t' | grep -v /um/ | grep -v '^sa' | grep -v '/poll.h$'|grep -v '^D'`
        for f in $L; do sed -i "-es/^\([^\"]*\)\(\<POLL$V\>\)/\\1E\\2/" $f; done
    done

with de-mangling cleanups yet to come.

NOTE! On almost all architectures, the EPOLL* constants have the same
values as the POLL* constants do.  But they keyword here is "almost".
For various bad reasons they aren't the same, and epoll() doesn't
actually work quite correctly in some cases due to this on Sparc et al.

The next patch from Al will sort out the final differences, and we
should be all done.

Scripted-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-02-11 14:34:03 -08:00

529 lines
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/*
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 |= EPOLLIN | EPOLLRDNORM;
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);
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