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linux/drivers/media/radio/radio-si470x.c
Tobias Lorenz 2fb8840663 V4L/DVB (7062): radio-si570x: Some fixes and new USB ID addition 
- avoid poss. locking when doing copy_to_user which may sleep
- RDS is automatically activated on read now
- code cleaned of unnecessary rds_commands
- USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
  (thanks to Guillaume RAMOUSSE)

Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-01-25 19:05:14 -02:00

1433 lines
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/*
* drivers/media/radio/radio-si470x.c
*
* Driver for USB radios for the Silicon Labs Si470x FM Radio Receivers:
* - Silicon Labs USB FM Radio Reference Design
* - ADS/Tech FM Radio Receiver (formerly Instant FM Music) (RDX-155-EF)
*
* Copyright (c) 2008 Tobias Lorenz <tobias.lorenz@gmx.net>
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* History:
* 2008-01-12 Tobias Lorenz <tobias.lorenz@gmx.net>
* Version 1.0.0
* - First working version
* 2008-01-13 Tobias Lorenz <tobias.lorenz@gmx.net>
* Version 1.0.1
* - Improved error handling, every function now returns errno
* - Improved multi user access (start/mute/stop)
* - Channel doesn't get lost anymore after start/mute/stop
* - RDS support added (polling mode via interrupt EP 1)
* - marked default module parameters with *value*
* - switched from bit structs to bit masks
* - header file cleaned and integrated
* 2008-01-14 Tobias Lorenz <tobias.lorenz@gmx.net>
* Version 1.0.2
* - hex values are now lower case
* - commented USB ID for ADS/Tech moved on todo list
* - blacklisted si470x in hid-quirks.c
* - rds buffer handling functions integrated into *_work, *_read
* - rds_command in si470x_poll exchanged against simple retval
* - check for firmware version 15
* - code order and prototypes still remain the same
* - spacing and bottom of band codes remain the same
* 2008-01-16 Tobias Lorenz <tobias.lorenz@gmx.net>
* Version 1.0.3
* - code reordered to avoid function prototypes
* - switch/case defaults are now more user-friendly
* - unified comment style
* - applied all checkpatch.pl v1.12 suggestions
* except the warning about the too long lines with bit comments
* - renamed FMRADIO to RADIO to cut line length (checkpatch.pl)
* 2008-01-22 Tobias Lorenz <tobias.lorenz@gmx.net>
* Version 1.0.4
* - avoid poss. locking when doing copy_to_user which may sleep
* - RDS is automatically activated on read now
* - code cleaned of unnecessary rds_commands
* - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified
* (thanks to Guillaume RAMOUSSE)
*
* ToDo:
* - add seeking support
* - add firmware download/update support
* - RDS support: interrupt mode, instead of polling
* - add LED status output (check if that's not already done in firmware)
*/
/* driver definitions */
#define DRIVER_AUTHOR "Tobias Lorenz <tobias.lorenz@gmx.net>"
#define DRIVER_NAME "radio-si470x"
#define DRIVER_VERSION KERNEL_VERSION(1, 0, 4)
#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
#define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
/* kernel includes */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/usb.h>
#include <linux/hid.h>
#include <linux/version.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <media/rds.h>
/* USB Device ID List */
static struct usb_device_id si470x_usb_driver_id_table[] = {
/* Silicon Labs USB FM Radio Reference Design */
{ USB_DEVICE_AND_INTERFACE_INFO(0x10c4, 0x818a, USB_CLASS_HID, 0, 0) },
/* ADS/Tech FM Radio Receiver (formerly Instant FM Music) */
{ USB_DEVICE_AND_INTERFACE_INFO(0x06e1, 0xa155, USB_CLASS_HID, 0, 0) },
/* Terminating entry */
{ }
};
MODULE_DEVICE_TABLE(usb, si470x_usb_driver_id_table);
/**************************************************************************
* Module Parameters
**************************************************************************/
/* Radio Nr */
static int radio_nr = -1;
module_param(radio_nr, int, 0);
MODULE_PARM_DESC(radio_nr, "Radio Nr");
/* Spacing (kHz) */
/* 0: 200 kHz (USA, Australia) */
/* 1: 100 kHz (Europe, Japan) */
/* 2: 50 kHz */
static int space = 2;
module_param(space, int, 0);
MODULE_PARM_DESC(radio_nr, "Spacing: 0=200kHz 1=100kHz *2=50kHz*");
/* Bottom of Band (MHz) */
/* 0: 87.5 - 108 MHz (USA, Europe)*/
/* 1: 76 - 108 MHz (Japan wide band) */
/* 2: 76 - 90 MHz (Japan) */
static int band = 1;
module_param(band, int, 0);
MODULE_PARM_DESC(radio_nr, "Band: 0=87.5..108MHz *1=76..108MHz* 2=76..90MHz");
/* De-emphasis */
/* 0: 75 us (USA) */
/* 1: 50 us (Europe, Australia, Japan) */
static int de = 1;
module_param(de, int, 0);
MODULE_PARM_DESC(radio_nr, "De-emphasis: 0=75us *1=50us*");
/* USB timeout */
static int usb_timeout = 500;
module_param(usb_timeout, int, 0);
MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
/* Seek retries */
static int seek_retries = 100;
module_param(seek_retries, int, 0);
MODULE_PARM_DESC(seek_retries, "Seek retries: *100*");
/* RDS buffer blocks */
static int rds_buf = 100;
module_param(rds_buf, int, 0);
MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
/* RDS maximum block errors */
static int 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, int, 0);
MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
/* RDS poll frequency */
static int rds_poll_time = 40;
/* 40 is used by the original USBRadio.exe */
/* 50 is used by radio-cadet */
/* 75 should be okay */
/* 80 is the usual RDS receive interval */
module_param(rds_poll_time, int, 0);
MODULE_PARM_DESC(rds_poll_time, "RDS poll time (ms): *40*");
/**************************************************************************
* Register Definitions
**************************************************************************/
#define RADIO_REGISTER_SIZE 2 /* 16 register bit width */
#define RADIO_REGISTER_NUM 16 /* DEVICEID ... RDSD */
#define RDS_REGISTER_NUM 6 /* STATUSRSSI ... RDSD */
#define DEVICEID 0 /* Device ID */
#define DEVICEID_PN 0xf000 /* bits 15..12: Part Number */
#define DEVICEID_MFGID 0x0fff /* bits 11..00: Manufacturer ID */
#define CHIPID 1 /* Chip ID */
#define CHIPID_REV 0xfc00 /* bits 15..10: Chip Version */
#define CHIPID_DEV 0x0200 /* bits 09..09: Device */
#define CHIPID_FIRMWARE 0x01ff /* bits 08..00: Firmware Version */
#define POWERCFG 2 /* Power Configuration */
#define POWERCFG_DSMUTE 0x8000 /* bits 15..15: Softmute Disable */
#define POWERCFG_DMUTE 0x4000 /* bits 14..14: Mute Disable */
#define POWERCFG_MONO 0x2000 /* bits 13..13: Mono Select */
#define POWERCFG_RDSM 0x0800 /* bits 11..11: RDS Mode (Si4701 only) */
#define POWERCFG_SKMODE 0x0400 /* bits 10..10: Seek Mode */
#define POWERCFG_SEEKUP 0x0200 /* bits 09..09: Seek Direction */
#define POWERCFG_SEEK 0x0100 /* bits 08..08: Seek */
#define POWERCFG_DISABLE 0x0040 /* bits 06..06: Powerup Disable */
#define POWERCFG_ENABLE 0x0001 /* bits 00..00: Powerup Enable */
#define CHANNEL 3 /* Channel */
#define CHANNEL_TUNE 0x8000 /* bits 15..15: Tune */
#define CHANNEL_CHAN 0x03ff /* bits 09..00: Channel Select */
#define SYSCONFIG1 4 /* System Configuration 1 */
#define SYSCONFIG1_RDSIEN 0x8000 /* bits 15..15: RDS Interrupt Enable (Si4701 only) */
#define SYSCONFIG1_STCIEN 0x4000 /* bits 14..14: Seek/Tune Complete Interrupt Enable */
#define SYSCONFIG1_RDS 0x1000 /* bits 12..12: RDS Enable (Si4701 only) */
#define SYSCONFIG1_DE 0x0800 /* bits 11..11: De-emphasis (0=75us 1=50us) */
#define SYSCONFIG1_AGCD 0x0400 /* bits 10..10: AGC Disable */
#define SYSCONFIG1_BLNDADJ 0x00c0 /* bits 07..06: Stereo/Mono Blend Level Adjustment */
#define SYSCONFIG1_GPIO3 0x0030 /* bits 05..04: General Purpose I/O 3 */
#define SYSCONFIG1_GPIO2 0x000c /* bits 03..02: General Purpose I/O 2 */
#define SYSCONFIG1_GPIO1 0x0003 /* bits 01..00: General Purpose I/O 1 */
#define SYSCONFIG2 5 /* System Configuration 2 */
#define SYSCONFIG2_SEEKTH 0xff00 /* bits 15..08: RSSI Seek Threshold */
#define SYSCONFIG2_BAND 0x0080 /* bits 07..06: Band Select */
#define SYSCONFIG2_SPACE 0x0030 /* bits 05..04: Channel Spacing */
#define SYSCONFIG2_VOLUME 0x000f /* bits 03..00: Volume */
#define SYSCONFIG3 6 /* System Configuration 3 */
#define SYSCONFIG3_SMUTER 0xc000 /* bits 15..14: Softmute Attack/Recover Rate */
#define SYSCONFIG3_SMUTEA 0x3000 /* bits 13..12: Softmute Attenuation */
#define SYSCONFIG3_SKSNR 0x00f0 /* bits 07..04: Seek SNR Threshold */
#define SYSCONFIG3_SKCNT 0x000f /* bits 03..00: Seek FM Impulse Detection Threshold */
#define TEST1 7 /* Test 1 */
#define TEST1_AHIZEN 0x4000 /* bits 14..14: Audio High-Z Enable */
#define TEST2 8 /* Test 2 */
/* TEST2 only contains reserved bits */
#define BOOTCONFIG 9 /* Boot Configuration */
/* BOOTCONFIG only contains reserved bits */
#define STATUSRSSI 10 /* Status RSSI */
#define STATUSRSSI_RDSR 0x8000 /* bits 15..15: RDS Ready (Si4701 only) */
#define STATUSRSSI_STC 0x4000 /* bits 14..14: Seek/Tune Complete */
#define STATUSRSSI_SF 0x2000 /* bits 13..13: Seek Fail/Band Limit */
#define STATUSRSSI_AFCRL 0x1000 /* bits 12..12: AFC Rail */
#define STATUSRSSI_RDSS 0x0800 /* bits 11..11: RDS Synchronized (Si4701 only) */
#define STATUSRSSI_BLERA 0x0600 /* bits 10..09: RDS Block A Errors (Si4701 only) */
#define STATUSRSSI_ST 0x0100 /* bits 08..08: Stereo Indicator */
#define STATUSRSSI_RSSI 0x00ff /* bits 07..00: RSSI (Received Signal Strength Indicator) */
#define READCHAN 11 /* Read Channel */
#define READCHAN_BLERB 0xc000 /* bits 15..14: RDS Block D Errors (Si4701 only) */
#define READCHAN_BLERC 0x3000 /* bits 13..12: RDS Block C Errors (Si4701 only) */
#define READCHAN_BLERD 0x0c00 /* bits 11..10: RDS Block B Errors (Si4701 only) */
#define READCHAN_READCHAN 0x03ff /* bits 09..00: Read Channel */
#define RDSA 12 /* RDSA */
#define RDSA_RDSA 0xffff /* bits 15..00: RDS Block A Data (Si4701 only) */
#define RDSB 13 /* RDSB */
#define RDSB_RDSB 0xffff /* bits 15..00: RDS Block B Data (Si4701 only) */
#define RDSC 14 /* RDSC */
#define RDSC_RDSC 0xffff /* bits 15..00: RDS Block C Data (Si4701 only) */
#define RDSD 15 /* RDSD */
#define RDSD_RDSD 0xffff /* bits 15..00: RDS Block D Data (Si4701 only) */
/**************************************************************************
* USB HID Reports
**************************************************************************/
/* Reports 1-16 give direct read/write access to the 16 Si470x registers */
/* with the (REPORT_ID - 1) corresponding to the register address across USB */
/* endpoint 0 using GET_REPORT and SET_REPORT */
#define REGISTER_REPORT_SIZE (RADIO_REGISTER_SIZE + 1)
#define REGISTER_REPORT(reg) ((reg) + 1)
/* Report 17 gives direct read/write access to the entire Si470x register */
/* map across endpoint 0 using GET_REPORT and SET_REPORT */
#define ENTIRE_REPORT_SIZE (RADIO_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
#define ENTIRE_REPORT 17
/* Report 18 is used to send the lowest 6 Si470x registers up the HID */
/* interrupt endpoint 1 to Windows every 20 milliseconds for status */
#define RDS_REPORT_SIZE (RDS_REGISTER_NUM * RADIO_REGISTER_SIZE + 1)
#define RDS_REPORT 18
/* Report 19: LED state */
#define LED_REPORT_SIZE 3
#define LED_REPORT 19
/* Report 19: stream */
#define STREAM_REPORT_SIZE 3
#define STREAM_REPORT 19
/* Report 20: scratch */
#define SCRATCH_PAGE_SIZE 63
#define SCRATCH_REPORT_SIZE (SCRATCH_PAGE_SIZE + 1)
#define SCRATCH_REPORT 20
/* Reports 19-22: flash upgrade of the C8051F321 */
#define WRITE_REPORT 19
#define FLASH_REPORT 20
#define CRC_REPORT 21
#define RESPONSE_REPORT 22
/* Report 23: currently unused, but can accept 60 byte reports on the HID */
/* interrupt out endpoint 2 every 1 millisecond */
#define UNUSED_REPORT 23
/**************************************************************************
* Software/Hardware Versions
**************************************************************************/
#define RADIO_SW_VERSION_NOT_BOOTLOADABLE 6
#define RADIO_SW_VERSION 7
#define RADIO_SW_VERSION_CURRENT 15
#define RADIO_HW_VERSION 1
#define SCRATCH_PAGE_SW_VERSION 1
#define SCRATCH_PAGE_HW_VERSION 2
/**************************************************************************
* LED State Definitions
**************************************************************************/
#define LED_COMMAND 0x35
#define NO_CHANGE_LED 0x00
#define ALL_COLOR_LED 0x01 /* streaming state */
#define BLINK_GREEN_LED 0x02 /* connect state */
#define BLINK_RED_LED 0x04
#define BLINK_ORANGE_LED 0x10 /* disconnect state */
#define SOLID_GREEN_LED 0x20 /* tuning/seeking state */
#define SOLID_RED_LED 0x40 /* bootload state */
#define SOLID_ORANGE_LED 0x80
/**************************************************************************
* Stream State Definitions
**************************************************************************/
#define STREAM_COMMAND 0x36
#define STREAM_VIDPID 0x00
#define STREAM_AUDIO 0xff
/**************************************************************************
* Bootloader / Flash Commands
**************************************************************************/
/* unique id sent to bootloader and required to put into a bootload state */
#define UNIQUE_BL_ID 0x34
/* mask for the flash data */
#define FLASH_DATA_MASK 0x55
/* bootloader commands */
#define GET_SW_VERSION_COMMAND 0x00
#define SET_PAGE_COMMAND 0x01
#define ERASE_PAGE_COMMAND 0x02
#define WRITE_PAGE_COMMAND 0x03
#define CRC_ON_PAGE_COMMAND 0x04
#define READ_FLASH_BYTE_COMMAND 0x05
#define RESET_DEVICE_COMMAND 0x06
#define GET_HW_VERSION_COMMAND 0x07
#define BLANK 0xff
/* bootloader command responses */
#define COMMAND_OK 0x01
#define COMMAND_FAILED 0x02
#define COMMAND_PENDING 0x03
/* buffer sizes */
#define COMMAND_BUFFER_SIZE 4
#define RESPONSE_BUFFER_SIZE 2
#define FLASH_BUFFER_SIZE 64
#define CRC_BUFFER_SIZE 3
/**************************************************************************
* General Driver Definitions
**************************************************************************/
/*
* si470x_device - private data
*/
struct si470x_device {
/* reference to USB and video device */
struct usb_device *usbdev;
struct video_device *videodev;
/* are these really necessary ? */
int users;
/* report buffer (maximum 64 bytes) */
unsigned char buf[64];
/* Silabs internal registers (0..15) */
unsigned short registers[RADIO_REGISTER_NUM];
/* RDS receive buffer */
struct work_struct work;
wait_queue_head_t read_queue;
struct timer_list timer;
spinlock_t lock; /* buffer locking */
unsigned char *buffer; /* size is always multiple of three */
unsigned int buf_size;
unsigned int rd_index;
unsigned int wr_index;
};
/*
* The frequency is set in units of 62.5 Hz when using V4L2_TUNER_CAP_LOW,
* 62.5 kHz otherwise.
* The tuner is able to have a channel spacing of 50, 100 or 200 kHz.
* tuner->capability is therefore set to V4L2_TUNER_CAP_LOW
* The FREQ_MUL is then: 1 MHz / 62.5 Hz = 16000
*/
#define FREQ_MUL (1000000 / 62.5)
/**************************************************************************
* General Driver Functions
**************************************************************************/
/*
* si470x_get_report - receive a HID report
*/
static int si470x_get_report(struct si470x_device *radio, int size)
{
return usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
HID_REQ_GET_REPORT,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
radio->buf[0], 2,
radio->buf, size, usb_timeout);
}
/*
* si470x_set_report - send a HID report
*/
static int si470x_set_report(struct si470x_device *radio, int size)
{
return usb_control_msg(radio->usbdev,
usb_sndctrlpipe(radio->usbdev, 0),
HID_REQ_SET_REPORT,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
radio->buf[0], 2,
radio->buf, size, usb_timeout);
}
/*
* si470x_get_register - read register
*/
static int si470x_get_register(struct si470x_device *radio, int regnr)
{
int retval;
radio->buf[0] = REGISTER_REPORT(regnr);
retval = si470x_get_report(radio, REGISTER_REPORT_SIZE);
if (retval >= 0)
radio->registers[regnr] = (radio->buf[1] << 8) | radio->buf[2];
return (retval < 0) ? -EINVAL : 0;
}
/*
* si470x_set_register - write register
*/
static int si470x_set_register(struct si470x_device *radio, int regnr)
{
int retval;
radio->buf[0] = REGISTER_REPORT(regnr);
radio->buf[1] = (radio->registers[regnr] & 0xff00) >> 8;
radio->buf[2] = (radio->registers[regnr] & 0x00ff);
retval = si470x_set_report(radio, REGISTER_REPORT_SIZE);
return (retval < 0) ? -EINVAL : 0;
}
/*
* si470x_get_all_registers - read entire registers
*/
static int si470x_get_all_registers(struct si470x_device *radio)
{
int retval;
int regnr;
radio->buf[0] = ENTIRE_REPORT;
retval = si470x_get_report(radio, ENTIRE_REPORT_SIZE);
if (retval >= 0)
for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
radio->registers[regnr] =
(radio->buf[regnr * RADIO_REGISTER_SIZE + 1] << 8) |
radio->buf[regnr * RADIO_REGISTER_SIZE + 2];
return (retval < 0) ? -EINVAL : 0;
}
/*
* si470x_get_rds_registers - read rds registers
*/
static int si470x_get_rds_registers(struct si470x_device *radio)
{
int retval;
int regnr;
int size;
radio->buf[0] = RDS_REPORT;
retval = usb_interrupt_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 1),
radio->buf, RDS_REPORT_SIZE, &size, usb_timeout);
if (retval >= 0)
for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
radio->registers[STATUSRSSI + regnr] =
(radio->buf[regnr * RADIO_REGISTER_SIZE + 1] << 8) |
radio->buf[regnr * RADIO_REGISTER_SIZE + 2];
return (retval < 0) ? -EINVAL : 0;
}
/*
* si470x_set_chan - set the channel
*/
static int si470x_set_chan(struct si470x_device *radio, int chan)
{
int retval, i;
/* start tuning */
radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
retval = si470x_set_register(radio, CHANNEL);
if (retval < 0)
return retval;
/* wait till seek operation has completed */
i = 0;
do {
retval = si470x_get_register(radio, STATUSRSSI);
if (retval < 0)
return retval;
} while ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) &&
(++i < seek_retries));
if (i >= seek_retries)
printk(KERN_WARNING DRIVER_NAME
": seek does not finish after %d tries\n", i);
/* stop tuning */
radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
return si470x_set_register(radio, CHANNEL);
}
/*
* si470x_get_freq - get the frequency
*/
static int si470x_get_freq(struct si470x_device *radio)
{
int spacing, band_bottom, chan, freq;
int retval;
/* Spacing (kHz) */
switch (space) {
/* 0: 200 kHz (USA, Australia) */
case 0 : spacing = 0.200 * FREQ_MUL; break;
/* 1: 100 kHz (Europe, Japan) */
case 1 : spacing = 0.100 * FREQ_MUL; break;
/* 2: 50 kHz */
default: spacing = 0.050 * FREQ_MUL; break;
};
/* Bottom of Band (MHz) */
switch (band) {
/* 0: 87.5 - 108 MHz (USA, Europe) */
case 0 : band_bottom = 87.5 * FREQ_MUL; break;
/* 1: 76 - 108 MHz (Japan wide band) */
default: band_bottom = 76 * FREQ_MUL; break;
/* 2: 76 - 90 MHz (Japan) */
case 2 : band_bottom = 76 * FREQ_MUL; break;
};
/* read channel */
retval = si470x_get_register(radio, READCHAN);
if (retval < 0)
return retval;
chan = radio->registers[READCHAN] & READCHAN_READCHAN;
/* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
freq = chan * spacing + band_bottom;
return freq;
}
/*
* si470x_set_freq - set the frequency
*/
static int si470x_set_freq(struct si470x_device *radio, int freq)
{
int spacing, band_bottom, chan;
/* Spacing (kHz) */
switch (space) {
/* 0: 200 kHz (USA, Australia) */
case 0 : spacing = 0.200 * FREQ_MUL; break;
/* 1: 100 kHz (Europe, Japan) */
case 1 : spacing = 0.100 * FREQ_MUL; break;
/* 2: 50 kHz */
default: spacing = 0.050 * FREQ_MUL; break;
};
/* Bottom of Band (MHz) */
switch (band) {
/* 0: 87.5 - 108 MHz (USA, Europe) */
case 0 : band_bottom = 87.5 * FREQ_MUL; break;
/* 1: 76 - 108 MHz (Japan wide band) */
default: band_bottom = 76 * FREQ_MUL; break;
/* 2: 76 - 90 MHz (Japan) */
case 2 : band_bottom = 76 * FREQ_MUL; break;
};
/* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
chan = (freq - band_bottom) / spacing;
return si470x_set_chan(radio, chan);
}
/*
* si470x_start - switch on radio
*/
static int si470x_start(struct si470x_device *radio)
{
int retval;
/* powercfg */
radio->registers[POWERCFG] =
POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
retval = si470x_set_register(radio, POWERCFG);
if (retval < 0)
return retval;
/* sysconfig 1 */
radio->registers[SYSCONFIG1] = SYSCONFIG1_DE;
retval = si470x_set_register(radio, SYSCONFIG1);
if (retval < 0)
return retval;
/* sysconfig 2 */
radio->registers[SYSCONFIG2] =
(0x3f << 8) | /* SEEKTH */
(band << 6) | /* BAND */
(space << 4) | /* SPACE */
15; /* VOLUME (max) */
retval = si470x_set_register(radio, SYSCONFIG2);
if (retval < 0)
return retval;
/* reset last channel */
return si470x_set_chan(radio,
radio->registers[CHANNEL] & CHANNEL_CHAN);
}
/*
* si470x_stop - switch off radio
*/
static int si470x_stop(struct si470x_device *radio)
{
int retval;
/* sysconfig 1 */
radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
retval = si470x_set_register(radio, SYSCONFIG1);
if (retval < 0)
return retval;
/* powercfg */
radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
/* POWERCFG_ENABLE has to automatically go low */
radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE;
return si470x_set_register(radio, POWERCFG);
}
/*
* si470x_rds_on - switch on rds reception
*/
static int si470x_rds_on(struct si470x_device *radio)
{
/* sysconfig 1 */
radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
return si470x_set_register(radio, SYSCONFIG1);
}
/**************************************************************************
* RDS Driver Functions
**************************************************************************/
/*
* si470x_rds - rds processing function
*/
static void si470x_rds(struct si470x_device *radio)
{
unsigned char tmpbuf[3];
unsigned char blocknum;
unsigned char bler; /* rds block errors */
unsigned short rds;
unsigned int i;
/* get rds blocks */
if (si470x_get_rds_registers(radio) < 0)
return;
if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSR) == 0) {
/* No RDS group ready */
return;
}
if ((radio->registers[STATUSRSSI] & STATUSRSSI_RDSS) == 0) {
/* RDS decoder not synchronized */
return;
}
/* copy four RDS blocks to internal buffer */
if (spin_trylock(&radio->lock)) {
/* process each rds block */
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 */
tmpbuf[0] = rds & 0x00ff; /* LSB */
tmpbuf[1] = (rds & 0xff00) >> 8;/* MSB */
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 */
for (i = 0; i < 3; i++) {
radio->buffer[radio->wr_index] = tmpbuf[i];
radio->wr_index++;
}
/* 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;
}
}
spin_unlock(&radio->lock);
}
/* wake up read queue */
if (radio->wr_index != radio->rd_index)
wake_up_interruptible(&radio->read_queue);
}
/*
* si470x_timer - rds timer function
*/
static void si470x_timer(unsigned long data)
{
struct si470x_device *radio = (struct si470x_device *) data;
schedule_work(&radio->work);
}
/*
* si470x_work - rds work function
*/
static void si470x_work(struct work_struct *work)
{
struct si470x_device *radio = container_of(work, struct si470x_device,
work);
if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
return;
si470x_rds(radio);
mod_timer(&radio->timer, jiffies + msecs_to_jiffies(rds_poll_time));
}
/**************************************************************************
* File Operations Interface
**************************************************************************/
/*
* si470x_fops_read - read RDS data
*/
static ssize_t si470x_fops_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
int retval = 0;
unsigned int block_count = 0;
/* switch on rds reception */
if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) {
si470x_rds_on(radio);
schedule_work(&radio->work);
}
/* block if no new data available */
while (radio->wr_index == radio->rd_index) {
if (file->f_flags & O_NONBLOCK)
return -EWOULDBLOCK;
interruptible_sleep_on(&radio->read_queue);
}
/* calculate block count from byte count */
count /= 3;
/* copy RDS block out of internal buffer and to user buffer */
if (spin_trylock(&radio->lock)) {
while (block_count < count) {
if (radio->rd_index == radio->wr_index)
break;
/* always transfer rds complete blocks */
if (copy_to_user(buf,
&radio->buffer[radio->rd_index], 3))
/* retval = -EFAULT; */
break;
/* increment and wrap read pointer */
radio->rd_index += 3;
if (radio->rd_index >= radio->buf_size)
radio->rd_index = 0;
/* increment counters */
block_count++;
buf += 3;
retval += 3;
}
spin_unlock(&radio->lock);
}
return retval;
}
/*
* si470x_fops_poll - poll RDS data
*/
static unsigned int si470x_fops_poll(struct file *file,
struct poll_table_struct *pts)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
/* switch on rds reception */
if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) {
si470x_rds_on(radio);
schedule_work(&radio->work);
}
poll_wait(file, &radio->read_queue, pts);
if (radio->rd_index != radio->wr_index)
return POLLIN | POLLRDNORM;
return 0;
}
/*
* si470x_fops_open - file open
*/
static int si470x_fops_open(struct inode *inode, struct file *file)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
radio->users++;
if (radio->users == 1)
return si470x_start(radio);
return 0;
}
/*
* si470x_fops_release - file release
*/
static int si470x_fops_release(struct inode *inode, struct file *file)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
if (!radio)
return -ENODEV;
radio->users--;
if (radio->users == 0) {
/* stop rds reception */
del_timer_sync(&radio->timer);
flush_scheduled_work();
/* cancel read processes */
wake_up_interruptible(&radio->read_queue);
return si470x_stop(radio);
}
return 0;
}
/*
* si470x_fops - file operations interface
*/
static const struct file_operations si470x_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.read = si470x_fops_read,
.poll = si470x_fops_poll,
.ioctl = video_ioctl2,
.compat_ioctl = v4l_compat_ioctl32,
.open = si470x_fops_open,
.release = si470x_fops_release,
};
/**************************************************************************
* Video4Linux Interface
**************************************************************************/
/*
* si470x_v4l2_queryctrl - query control
*/
static struct v4l2_queryctrl si470x_v4l2_queryctrl[] = {
/* HINT: the disabled controls are only here to satify kradio and such apps */
{
.id = V4L2_CID_AUDIO_VOLUME,
.type = V4L2_CTRL_TYPE_INTEGER,
.name = "Volume",
.minimum = 0,
.maximum = 15,
.step = 1,
.default_value = 15,
},
{
.id = V4L2_CID_AUDIO_BALANCE,
.flags = V4L2_CTRL_FLAG_DISABLED,
},
{
.id = V4L2_CID_AUDIO_BASS,
.flags = V4L2_CTRL_FLAG_DISABLED,
},
{
.id = V4L2_CID_AUDIO_TREBLE,
.flags = V4L2_CTRL_FLAG_DISABLED,
},
{
.id = V4L2_CID_AUDIO_MUTE,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Mute",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 1,
},
{
.id = V4L2_CID_AUDIO_LOUDNESS,
.flags = V4L2_CTRL_FLAG_DISABLED,
},
};
/*
* si470x_vidioc_querycap - query device capabilities
*/
static int si470x_vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *capability)
{
strlcpy(capability->driver, DRIVER_NAME, sizeof(capability->driver));
strlcpy(capability->card, DRIVER_CARD, sizeof(capability->card));
sprintf(capability->bus_info, "USB");
capability->version = DRIVER_VERSION;
capability->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
return 0;
}
/*
* si470x_vidioc_g_input - get input
*/
static int si470x_vidioc_g_input(struct file *filp, void *priv,
unsigned int *i)
{
*i = 0;
return 0;
}
/*
* si470x_vidioc_s_input - set input
*/
static int si470x_vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
if (i != 0)
return -EINVAL;
return 0;
}
/*
* si470x_vidioc_queryctrl - enumerate control items
*/
static int si470x_vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
int i;
for (i = 0; i < ARRAY_SIZE(si470x_v4l2_queryctrl); i++) {
if (qc->id && qc->id == si470x_v4l2_queryctrl[i].id) {
memcpy(qc, &(si470x_v4l2_queryctrl[i]), sizeof(*qc));
return 0;
}
}
return -EINVAL;
}
/*
* si470x_vidioc_g_ctrl - get the value of a control
*/
static int si470x_vidioc_g_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
switch (ctrl->id) {
case V4L2_CID_AUDIO_VOLUME:
ctrl->value = radio->registers[SYSCONFIG2] &
SYSCONFIG2_VOLUME;
break;
case V4L2_CID_AUDIO_MUTE:
ctrl->value = ((radio->registers[POWERCFG] &
POWERCFG_DMUTE) == 0) ? 1 : 0;
break;
}
return 0;
}
/*
* si470x_vidioc_s_ctrl - set the value of a control
*/
static int si470x_vidioc_s_ctrl(struct file *file, void *priv,
struct v4l2_control *ctrl)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
switch (ctrl->id) {
case V4L2_CID_AUDIO_VOLUME:
radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
radio->registers[SYSCONFIG2] |= ctrl->value;
return si470x_set_register(radio, SYSCONFIG2);
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value == 1)
radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
else
radio->registers[POWERCFG] |= POWERCFG_DMUTE;
return si470x_set_register(radio, POWERCFG);
}
return -EINVAL;
}
/*
* si470x_vidioc_g_audio - get audio attributes
*/
static int si470x_vidioc_g_audio(struct file *file, void *priv,
struct v4l2_audio *audio)
{
if (audio->index > 1)
return -EINVAL;
strcpy(audio->name, "Radio");
audio->capability = V4L2_AUDCAP_STEREO;
return 0;
}
/*
* si470x_vidioc_s_audio - set audio attributes
*/
static int si470x_vidioc_s_audio(struct file *file, void *priv,
struct v4l2_audio *audio)
{
if (audio->index != 0)
return -EINVAL;
return 0;
}
/*
* si470x_vidioc_g_tuner - get tuner attributes
*/
static int si470x_vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *tuner)
{
int retval;
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
if (tuner->index > 0)
return -EINVAL;
/* read status rssi */
retval = si470x_get_register(radio, STATUSRSSI);
if (retval < 0)
return retval;
strcpy(tuner->name, "FM");
tuner->type = V4L2_TUNER_RADIO;
switch (band) {
/* 0: 87.5 - 108 MHz (USA, Europe, default) */
default:
tuner->rangelow = 87.5 * FREQ_MUL;
tuner->rangehigh = 108 * FREQ_MUL;
break;
/* 1: 76 - 108 MHz (Japan wide band) */
case 1 :
tuner->rangelow = 76 * FREQ_MUL;
tuner->rangehigh = 108 * FREQ_MUL;
break;
/* 2: 76 - 90 MHz (Japan) */
case 2 :
tuner->rangelow = 76 * FREQ_MUL;
tuner->rangehigh = 90 * FREQ_MUL;
break;
};
tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
tuner->capability = V4L2_TUNER_CAP_LOW;
/* Stereo indicator == Stereo (instead of Mono) */
if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 1)
tuner->audmode = V4L2_TUNER_MODE_STEREO;
else
tuner->audmode = V4L2_TUNER_MODE_MONO;
/* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI)
* 0x0101;
/* automatic frequency control: -1: freq to low, 1 freq to high */
tuner->afc = 0;
return 0;
}
/*
* si470x_vidioc_s_tuner - set tuner attributes
*/
static int si470x_vidioc_s_tuner(struct file *file, void *priv,
struct v4l2_tuner *tuner)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
if (tuner->index > 0)
return -EINVAL;
if (tuner->audmode == V4L2_TUNER_MODE_MONO)
radio->registers[POWERCFG] |= POWERCFG_MONO; /* force mono */
else
radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
return si470x_set_register(radio, POWERCFG);
}
/*
* si470x_vidioc_g_frequency - get tuner or modulator radio frequency
*/
static int si470x_vidioc_g_frequency(struct file *file, void *priv,
struct v4l2_frequency *freq)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
freq->type = V4L2_TUNER_RADIO;
freq->frequency = si470x_get_freq(radio);
return 0;
}
/*
* si470x_vidioc_s_frequency - set tuner or modulator radio frequency
*/
static int si470x_vidioc_s_frequency(struct file *file, void *priv,
struct v4l2_frequency *freq)
{
struct si470x_device *radio = video_get_drvdata(video_devdata(file));
if (freq->type != V4L2_TUNER_RADIO)
return -EINVAL;
return si470x_set_freq(radio, freq->frequency);
}
/*
* si470x_viddev_tamples - video device interface
*/
static struct video_device si470x_viddev_template = {
.fops = &si470x_fops,
.name = DRIVER_NAME,
.type = VID_TYPE_TUNER,
.release = video_device_release,
.vidioc_querycap = si470x_vidioc_querycap,
.vidioc_g_input = si470x_vidioc_g_input,
.vidioc_s_input = si470x_vidioc_s_input,
.vidioc_queryctrl = si470x_vidioc_queryctrl,
.vidioc_g_ctrl = si470x_vidioc_g_ctrl,
.vidioc_s_ctrl = si470x_vidioc_s_ctrl,
.vidioc_g_audio = si470x_vidioc_g_audio,
.vidioc_s_audio = si470x_vidioc_s_audio,
.vidioc_g_tuner = si470x_vidioc_g_tuner,
.vidioc_s_tuner = si470x_vidioc_s_tuner,
.vidioc_g_frequency = si470x_vidioc_g_frequency,
.vidioc_s_frequency = si470x_vidioc_s_frequency,
.owner = THIS_MODULE,
};
/**************************************************************************
* USB Interface
**************************************************************************/
/*
* si470x_usb_driver_probe - probe for the device
*/
static int si470x_usb_driver_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct si470x_device *radio;
/* memory and interface allocations */
radio = kmalloc(sizeof(struct si470x_device), GFP_KERNEL);
if (!radio)
return -ENOMEM;
radio->videodev = video_device_alloc();
if (!radio->videodev) {
kfree(radio);
return -ENOMEM;
}
memcpy(radio->videodev, &si470x_viddev_template,
sizeof(si470x_viddev_template));
radio->users = 0;
radio->usbdev = interface_to_usbdev(intf);
video_set_drvdata(radio->videodev, radio);
if (video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr)) {
printk(KERN_WARNING DRIVER_NAME
": Could not register video device\n");
video_device_release(radio->videodev);
kfree(radio);
return -EIO;
}
usb_set_intfdata(intf, radio);
/* show some infos about the specific device */
if (si470x_get_all_registers(radio) < 0) {
video_device_release(radio->videodev);
kfree(radio);
return -EIO;
}
printk(KERN_INFO DRIVER_NAME ": DeviceID=0x%4.4x ChipID=0x%4.4x\n",
radio->registers[DEVICEID], radio->registers[CHIPID]);
/* check if firmware is current */
if ((radio->registers[CHIPID] & CHIPID_FIRMWARE)
< RADIO_SW_VERSION_CURRENT)
printk(KERN_WARNING DRIVER_NAME
": This driver is known to work with chip version %d, "
"but the device has firmware %d.\n"
DRIVER_NAME
"If you have some trouble using this driver, please "
"report to V4L ML at video4linux-list@redhat.com\n",
radio->registers[CHIPID] & CHIPID_FIRMWARE,
RADIO_SW_VERSION_CURRENT);
/* set initial frequency */
si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
/* rds initialization */
radio->buf_size = rds_buf * 3;
radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
if (!radio->buffer) {
video_device_release(radio->videodev);
kfree(radio);
return -ENOMEM;
}
radio->wr_index = 0;
radio->rd_index = 0;
init_waitqueue_head(&radio->read_queue);
/* prepare polling via eventd */
INIT_WORK(&radio->work, si470x_work);
init_timer(&radio->timer);
radio->timer.function = si470x_timer;
radio->timer.data = (unsigned long) radio;
return 0;
}
/*
* si470x_usb_driver_disconnect - disconnect the device
*/
static void si470x_usb_driver_disconnect(struct usb_interface *intf)
{
struct si470x_device *radio = usb_get_intfdata(intf);
del_timer_sync(&radio->timer);
flush_scheduled_work();
usb_set_intfdata(intf, NULL);
if (radio) {
video_unregister_device(radio->videodev);
kfree(radio->buffer);
kfree(radio);
}
}
/*
* si470x_usb_driver - usb driver interface
*/
static struct usb_driver si470x_usb_driver = {
.name = DRIVER_NAME,
.probe = si470x_usb_driver_probe,
.disconnect = si470x_usb_driver_disconnect,
.id_table = si470x_usb_driver_id_table,
};
/**************************************************************************
* Module Interface
**************************************************************************/
/*
* si470x_module_init - module init
*/
static int __init si470x_module_init(void)
{
printk(KERN_INFO DRIVER_DESC "\n");
return usb_register(&si470x_usb_driver);
}
/*
* si470x_module_exit - module exit
*/
static void __exit si470x_module_exit(void)
{
usb_deregister(&si470x_usb_driver);
}
module_init(si470x_module_init);
module_exit(si470x_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION("1.0.4");
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