522 строки
12 KiB
C
522 строки
12 KiB
C
/*
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Driver for SAA6588 RDS decoder
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(c) 2005 Hans J. Koch
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/types.h>
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#include <linux/videodev.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/poll.h>
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#include <linux/wait.h>
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#include <asm/uaccess.h>
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#include "rds.h"
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/* Addresses to scan */
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static unsigned short normal_i2c[] = {
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0x20 >> 1,
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0x22 >> 1,
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I2C_CLIENT_END,
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};
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I2C_CLIENT_INSMOD;
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/* insmod options */
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static unsigned int debug = 0;
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static unsigned int xtal = 0;
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static unsigned int rbds = 0;
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static unsigned int plvl = 0;
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static unsigned int bufblocks = 100;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "enable debug messages");
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module_param(xtal, int, 0);
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MODULE_PARM_DESC(xtal, "select oscillator frequency (0..3), default 0");
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module_param(rbds, int, 0);
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MODULE_PARM_DESC(rbds, "select mode, 0=RDS, 1=RBDS, default 0");
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module_param(plvl, int, 0);
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MODULE_PARM_DESC(plvl, "select pause level (0..3), default 0");
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module_param(bufblocks, int, 0);
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MODULE_PARM_DESC(bufblocks, "number of buffered blocks, default 100");
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MODULE_DESCRIPTION("v4l2 driver module for SAA6588 RDS decoder");
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MODULE_AUTHOR("Hans J. Koch <koch@hjk-az.de>");
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MODULE_LICENSE("GPL");
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/* ---------------------------------------------------------------------- */
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#define UNSET (-1U)
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#define PREFIX "saa6588: "
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#define dprintk if (debug) printk
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struct saa6588 {
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struct i2c_client client;
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struct work_struct work;
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struct timer_list timer;
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spinlock_t lock;
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unsigned char *buffer;
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unsigned int buf_size;
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unsigned int rd_index;
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unsigned int wr_index;
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unsigned int block_count;
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unsigned char last_blocknum;
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wait_queue_head_t read_queue;
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int data_available_for_read;
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};
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static struct i2c_driver driver;
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static struct i2c_client client_template;
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/* ---------------------------------------------------------------------- */
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/*
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* SAA6588 defines
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*/
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/* Initialization and mode control byte (0w) */
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/* bit 0+1 (DAC0/DAC1) */
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#define cModeStandard 0x00
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#define cModeFastPI 0x01
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#define cModeReducedRequest 0x02
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#define cModeInvalid 0x03
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/* bit 2 (RBDS) */
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#define cProcessingModeRDS 0x00
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#define cProcessingModeRBDS 0x04
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/* bit 3+4 (SYM0/SYM1) */
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#define cErrCorrectionNone 0x00
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#define cErrCorrection2Bits 0x08
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#define cErrCorrection5Bits 0x10
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#define cErrCorrectionNoneRBDS 0x18
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/* bit 5 (NWSY) */
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#define cSyncNormal 0x00
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#define cSyncRestart 0x20
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/* bit 6 (TSQD) */
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#define cSigQualityDetectOFF 0x00
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#define cSigQualityDetectON 0x40
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/* bit 7 (SQCM) */
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#define cSigQualityTriggered 0x00
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#define cSigQualityContinous 0x80
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/* Pause level and flywheel control byte (1w) */
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/* bits 0..5 (FEB0..FEB5) */
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#define cFlywheelMaxBlocksMask 0x3F
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#define cFlywheelDefault 0x20
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/* bits 6+7 (PL0/PL1) */
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#define cPauseLevel_11mV 0x00
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#define cPauseLevel_17mV 0x40
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#define cPauseLevel_27mV 0x80
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#define cPauseLevel_43mV 0xC0
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/* Pause time/oscillator frequency/quality detector control byte (1w) */
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/* bits 0..4 (SQS0..SQS4) */
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#define cQualityDetectSensMask 0x1F
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#define cQualityDetectDefault 0x0F
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/* bit 5 (SOSC) */
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#define cSelectOscFreqOFF 0x00
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#define cSelectOscFreqON 0x20
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/* bit 6+7 (PTF0/PTF1) */
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#define cOscFreq_4332kHz 0x00
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#define cOscFreq_8664kHz 0x40
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#define cOscFreq_12996kHz 0x80
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#define cOscFreq_17328kHz 0xC0
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/* ---------------------------------------------------------------------- */
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static int block_to_user_buf(struct saa6588 *s, unsigned char __user *user_buf)
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{
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int i;
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if (s->rd_index == s->wr_index) {
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if (debug > 2)
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dprintk(PREFIX "Read: buffer empty.\n");
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return 0;
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}
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if (debug > 2) {
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dprintk(PREFIX "Read: ");
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for (i = s->rd_index; i < s->rd_index + 3; i++)
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dprintk("0x%02x ", s->buffer[i]);
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}
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if (copy_to_user(user_buf, &s->buffer[s->rd_index], 3))
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return -EFAULT;
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s->rd_index += 3;
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if (s->rd_index >= s->buf_size)
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s->rd_index = 0;
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s->block_count--;
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if (debug > 2)
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dprintk("%d blocks total.\n", s->block_count);
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return 1;
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}
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static void read_from_buf(struct saa6588 *s, struct rds_command *a)
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{
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unsigned long flags;
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unsigned char __user *buf_ptr = a->buffer;
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unsigned int i;
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unsigned int rd_blocks;
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a->result = 0;
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if (!a->buffer)
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return;
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while (!s->data_available_for_read) {
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int ret = wait_event_interruptible(s->read_queue,
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s->data_available_for_read);
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if (ret == -ERESTARTSYS) {
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a->result = -EINTR;
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return;
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}
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}
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spin_lock_irqsave(&s->lock, flags);
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rd_blocks = a->block_count;
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if (rd_blocks > s->block_count)
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rd_blocks = s->block_count;
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if (!rd_blocks)
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return;
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for (i = 0; i < rd_blocks; i++) {
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if (block_to_user_buf(s, buf_ptr)) {
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buf_ptr += 3;
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a->result++;
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} else
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break;
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}
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a->result *= 3;
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s->data_available_for_read = (s->block_count > 0);
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spin_unlock_irqrestore(&s->lock, flags);
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}
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static void block_to_buf(struct saa6588 *s, unsigned char *blockbuf)
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{
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unsigned int i;
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if (debug > 3)
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dprintk(PREFIX "New block: ");
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for (i = 0; i < 3; ++i) {
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if (debug > 3)
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dprintk("0x%02x ", blockbuf[i]);
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s->buffer[s->wr_index] = blockbuf[i];
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s->wr_index++;
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}
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if (s->wr_index >= s->buf_size)
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s->wr_index = 0;
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if (s->wr_index == s->rd_index) {
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s->rd_index += 3;
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if (s->rd_index >= s->buf_size)
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s->rd_index = 0;
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} else
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s->block_count++;
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if (debug > 3)
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dprintk("%d blocks total.\n", s->block_count);
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}
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static void saa6588_i2c_poll(struct saa6588 *s)
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{
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unsigned long flags;
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unsigned char tmpbuf[6];
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unsigned char blocknum;
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unsigned char tmp;
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/* Although we only need 3 bytes, we have to read at least 6.
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SAA6588 returns garbage otherwise */
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if (6 != i2c_master_recv(&s->client, &tmpbuf[0], 6)) {
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if (debug > 1)
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dprintk(PREFIX "read error!\n");
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return;
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}
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blocknum = tmpbuf[0] >> 5;
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if (blocknum == s->last_blocknum) {
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if (debug > 3)
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dprintk("Saw block %d again.\n", blocknum);
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return;
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}
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s->last_blocknum = blocknum;
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/*
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Byte order according to v4l2 specification:
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Byte 0: Least Significant Byte of RDS Block
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Byte 1: Most Significant Byte of RDS Block
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Byte 2 Bit 7: Error bit. Indicates that an uncorrectable error
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occurred during reception of this block.
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Bit 6: Corrected bit. Indicates that an error was
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corrected for this data block.
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Bits 5-3: Received Offset. Indicates the offset received
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by the sync system.
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Bits 2-0: Offset Name. Indicates the offset applied to this data.
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SAA6588 byte order is Status-MSB-LSB, so we have to swap the
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first and the last of the 3 bytes block.
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*/
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tmp = tmpbuf[2];
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tmpbuf[2] = tmpbuf[0];
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tmpbuf[0] = tmp;
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tmp = blocknum;
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tmp |= blocknum << 3; /* Received offset == Offset Name (OK ?) */
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if ((tmpbuf[2] & 0x03) == 0x03)
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tmp |= 0x80; /* uncorrectable error */
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else if ((tmpbuf[2] & 0x03) != 0x00)
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tmp |= 0x40; /* corrected error */
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tmpbuf[2] = tmp; /* Is this enough ? Should we also check other bits ? */
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spin_lock_irqsave(&s->lock, flags);
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block_to_buf(s, tmpbuf);
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spin_unlock_irqrestore(&s->lock, flags);
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s->data_available_for_read = 1;
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wake_up_interruptible(&s->read_queue);
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}
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static void saa6588_timer(unsigned long data)
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{
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struct saa6588 *s = (struct saa6588 *)data;
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schedule_work(&s->work);
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}
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static void saa6588_work(void *data)
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{
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struct saa6588 *s = (struct saa6588 *)data;
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saa6588_i2c_poll(s);
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mod_timer(&s->timer, jiffies + msecs_to_jiffies(20));
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}
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static int saa6588_configure(struct saa6588 *s)
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{
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unsigned char buf[3];
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int rc;
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buf[0] = cSyncRestart;
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if (rbds)
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buf[0] |= cProcessingModeRBDS;
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buf[1] = cFlywheelDefault;
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switch (plvl) {
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case 0:
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buf[1] |= cPauseLevel_11mV;
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break;
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case 1:
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buf[1] |= cPauseLevel_17mV;
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break;
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case 2:
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buf[1] |= cPauseLevel_27mV;
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break;
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case 3:
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buf[1] |= cPauseLevel_43mV;
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break;
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default: /* nothing */
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break;
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}
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buf[2] = cQualityDetectDefault | cSelectOscFreqON;
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switch (xtal) {
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case 0:
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buf[2] |= cOscFreq_4332kHz;
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break;
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case 1:
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buf[2] |= cOscFreq_8664kHz;
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break;
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case 2:
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buf[2] |= cOscFreq_12996kHz;
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break;
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case 3:
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buf[2] |= cOscFreq_17328kHz;
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break;
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default: /* nothing */
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break;
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}
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dprintk(PREFIX "writing: 0w=0x%02x 1w=0x%02x 2w=0x%02x\n",
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buf[0], buf[1], buf[2]);
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if (3 != (rc = i2c_master_send(&s->client, buf, 3)))
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printk(PREFIX "i2c i/o error: rc == %d (should be 3)\n", rc);
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return 0;
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}
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/* ---------------------------------------------------------------------- */
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static int saa6588_attach(struct i2c_adapter *adap, int addr, int kind)
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{
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struct saa6588 *s;
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client_template.adapter = adap;
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client_template.addr = addr;
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printk(PREFIX "chip found @ 0x%x\n", addr << 1);
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if (NULL == (s = kmalloc(sizeof(*s), GFP_KERNEL)))
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return -ENOMEM;
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s->buf_size = bufblocks * 3;
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if (NULL == (s->buffer = kmalloc(s->buf_size, GFP_KERNEL))) {
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kfree(s);
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return -ENOMEM;
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}
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s->client = client_template;
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s->block_count = 0;
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s->wr_index = 0;
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s->rd_index = 0;
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s->last_blocknum = 0xff;
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init_waitqueue_head(&s->read_queue);
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s->data_available_for_read = 0;
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i2c_set_clientdata(&s->client, s);
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i2c_attach_client(&s->client);
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saa6588_configure(s);
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/* start polling via eventd */
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INIT_WORK(&s->work, saa6588_work, s);
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init_timer(&s->timer);
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s->timer.function = saa6588_timer;
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s->timer.data = (unsigned long)s;
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schedule_work(&s->work);
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return 0;
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}
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static int saa6588_probe(struct i2c_adapter *adap)
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{
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if (adap->class & I2C_CLASS_TV_ANALOG)
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return i2c_probe(adap, &addr_data, saa6588_attach);
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return 0;
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}
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static int saa6588_detach(struct i2c_client *client)
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{
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struct saa6588 *s = i2c_get_clientdata(client);
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del_timer_sync(&s->timer);
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flush_scheduled_work();
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i2c_detach_client(client);
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kfree(s->buffer);
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kfree(s);
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return 0;
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}
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static int saa6588_command(struct i2c_client *client, unsigned int cmd,
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void *arg)
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{
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struct saa6588 *s = i2c_get_clientdata(client);
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struct rds_command *a = (struct rds_command *)arg;
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switch (cmd) {
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/* --- open() for /dev/radio --- */
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case RDS_CMD_OPEN:
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a->result = 0; /* return error if chip doesn't work ??? */
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break;
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/* --- close() for /dev/radio --- */
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case RDS_CMD_CLOSE:
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s->data_available_for_read = 1;
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wake_up_interruptible(&s->read_queue);
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a->result = 0;
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break;
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/* --- read() for /dev/radio --- */
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case RDS_CMD_READ:
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read_from_buf(s, a);
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break;
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/* --- poll() for /dev/radio --- */
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case RDS_CMD_POLL:
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a->result = 0;
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if (s->data_available_for_read) {
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a->result |= POLLIN | POLLRDNORM;
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}
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poll_wait(a->instance, &s->read_queue, a->event_list);
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break;
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default:
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/* nothing */
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break;
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}
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static struct i2c_driver driver = {
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.driver = {
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.name = "saa6588",
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},
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.id = -1, /* FIXME */
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.attach_adapter = saa6588_probe,
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.detach_client = saa6588_detach,
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.command = saa6588_command,
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};
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static struct i2c_client client_template = {
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.name = "saa6588",
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.driver = &driver,
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};
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static int __init saa6588_init_module(void)
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{
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return i2c_add_driver(&driver);
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}
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static void __exit saa6588_cleanup_module(void)
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{
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i2c_del_driver(&driver);
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}
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module_init(saa6588_init_module);
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module_exit(saa6588_cleanup_module);
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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