--- /dev/null
+/*
+ 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/videodev.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/wait.h>
+#include <asm/uaccess.h>
+
+
+#include <media/rds.h>
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = {
+ 0x20 >> 1,
+ 0x22 >> 1,
+ I2C_CLIENT_END,
+};
+
+I2C_CLIENT_INSMOD;
+
+/* insmod options */
+static unsigned int debug = 0;
+static unsigned int xtal = 0;
+static unsigned int rbds = 0;
+static unsigned int plvl = 0;
+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(rbds, int, 0);
+MODULE_PARM_DESC(rbds, "select mode, 0=RDS, 1=RBDS, default 0");
+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 i2c_client client;
+ struct work_struct work;
+ struct timer_list timer;
+ 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;
+};
+
+static struct i2c_driver driver;
+static struct i2c_client client_template;
+
+/* ---------------------------------------------------------------------- */
+
+/*
+ * 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 int block_to_user_buf(struct saa6588 *s, unsigned char __user *user_buf)
+{
+ int i;
+
+ if (s->rd_index == s->wr_index) {
+ if (debug > 2)
+ dprintk(PREFIX "Read: buffer empty.\n");
+ return 0;
+ }
+
+ if (debug > 2) {
+ dprintk(PREFIX "Read: ");
+ for (i = s->rd_index; i < s->rd_index + 3; i++)
+ dprintk("0x%02x ", s->buffer[i]);
+ }
+
+ if (copy_to_user(user_buf, &s->buffer[s->rd_index], 3))
+ return -EFAULT;
+
+ 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 1;
+}
+
+static void read_from_buf(struct saa6588 *s, struct rds_command *a)
+{
+ unsigned long flags;
+
+ unsigned char __user *buf_ptr = a->buffer;
+ unsigned int i;
+ unsigned int rd_blocks;
+
+ a->result = 0;
+ if (!a->buffer)
+ return;
+
+ while (!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;
+ }
+ }
+
+ spin_lock_irqsave(&s->lock, flags);
+ rd_blocks = a->block_count;
+ if (rd_blocks > s->block_count)
+ rd_blocks = s->block_count;
+
+ if (!rd_blocks)
+ return;
+
+ for (i = 0; i < rd_blocks; i++) {
+ if (block_to_user_buf(s, buf_ptr)) {
+ buf_ptr += 3;
+ a->result++;
+ } else
+ break;
+ }
+ a->result *= 3;
+ 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)
+{
+ 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(&s->client, &tmpbuf[0], 6)) {
+ if (debug > 1)
+ dprintk(PREFIX "read error!\n");
+ 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: Received Offset. Indicates the offset received
+ by the sync system.
+ Bits 2-0: Offset Name. Indicates the offset applied to this data.
+
+ SAA6588 byte order is Status-MSB-LSB, so we have to swap the
+ first and the last of the 3 bytes block.
+ */
+
+ tmp = tmpbuf[2];
+ tmpbuf[2] = tmpbuf[0];
+ tmpbuf[0] = tmp;
+
+ tmp = blocknum;
+ tmp |= blocknum << 3; /* Received offset == Offset Name (OK ?) */
+ if ((tmpbuf[2] & 0x03) == 0x03)
+ tmp |= 0x80; /* uncorrectable error */
+ else if ((tmpbuf[2] & 0x03) != 0x00)
+ tmp |= 0x40; /* 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_timer(unsigned long data)
+{
+ struct saa6588 *s = (struct saa6588 *)data;
+
+ schedule_work(&s->work);
+}
+
+static void saa6588_work(void *data)
+{
+ struct saa6588 *s = (struct saa6588 *)data;
+
+ saa6588_i2c_poll(s);
+ mod_timer(&s->timer, jiffies + msecs_to_jiffies(20));
+}
+
+static int saa6588_configure(struct saa6588 *s)
+{
+ unsigned char buf[3];
+ int rc;
+
+ buf[0] = cSyncRestart;
+ if (rbds)
+ 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]);
+
+ if (3 != (rc = i2c_master_send(&s->client, buf, 3)))
+ printk(PREFIX "i2c i/o error: rc == %d (should be 3)\n", rc);
+
+ return 0;
+}
+
+/* ---------------------------------------------------------------------- */
+
+static int saa6588_attach(struct i2c_adapter *adap, int addr, int kind)
+{
+ struct saa6588 *s;
+ client_template.adapter = adap;
+ client_template.addr = addr;
+
+ printk(PREFIX "chip found @ 0x%x\n", addr << 1);
+
+ if (NULL == (s = kmalloc(sizeof(*s), GFP_KERNEL)))
+ return -ENOMEM;
+
+ s->buf_size = bufblocks * 3;
+
+ if (NULL == (s->buffer = kmalloc(s->buf_size, GFP_KERNEL))) {
+ kfree(s);
+ return -ENOMEM;
+ }
+ s->client = client_template;
+ 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;
+ i2c_set_clientdata(&s->client, s);
+ i2c_attach_client(&s->client);
+
+ saa6588_configure(s);
+
+ /* start polling via eventd */
+ INIT_WORK(&s->work, saa6588_work, s);
+ init_timer(&s->timer);
+ s->timer.function = saa6588_timer;
+ s->timer.data = (unsigned long)s;
+ schedule_work(&s->work);
+ return 0;
+}
+
+static int saa6588_probe(struct i2c_adapter *adap)
+{
+ if (adap->class & I2C_CLASS_TV_ANALOG)
+ return i2c_probe(adap, &addr_data, saa6588_attach);
+ return 0;
+}
+
+static int saa6588_detach(struct i2c_client *client)
+{
+ struct saa6588 *s = i2c_get_clientdata(client);
+
+ del_timer_sync(&s->timer);
+ flush_scheduled_work();
+
+ i2c_detach_client(client);
+ kfree(s->buffer);
+ kfree(s);
+ return 0;
+}
+
+static int saa6588_command(struct i2c_client *client, unsigned int cmd,
+ void *arg)
+{
+ struct saa6588 *s = i2c_get_clientdata(client);
+ struct rds_command *a = (struct rds_command *)arg;
+
+ switch (cmd) {
+ /* --- open() for /dev/radio --- */
+ case RDS_CMD_OPEN:
+ a->result = 0; /* return error if chip doesn't work ??? */
+ break;
+ /* --- close() for /dev/radio --- */
+ case RDS_CMD_CLOSE:
+ s->data_available_for_read = 1;
+ wake_up_interruptible(&s->read_queue);
+ a->result = 0;
+ break;
+ /* --- read() for /dev/radio --- */
+ case RDS_CMD_READ:
+ read_from_buf(s, a);
+ break;
+ /* --- poll() for /dev/radio --- */
+ case RDS_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 */
+ break;
+ }
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static struct i2c_driver driver = {
+ .driver = {
+ .name = "saa6588",
+ },
+ .id = -1, /* FIXME */
+ .attach_adapter = saa6588_probe,
+ .detach_client = saa6588_detach,
+ .command = saa6588_command,
+};
+
+static struct i2c_client client_template = {
+ .name = "saa6588",
+ .driver = &driver,
+};
+
+static int __init saa6588_init_module(void)
+{
+ return i2c_add_driver(&driver);
+}
+
+static void __exit saa6588_cleanup_module(void)
+{
+ i2c_del_driver(&driver);
+}
+
+module_init(saa6588_init_module);
+module_exit(saa6588_cleanup_module);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */
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