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linux/drivers/media/radio/radio-si470x.c
Tobias Lorenz 617f53336c V4L/DVB (9218): si470x: removement of get/set input/audio 
This patch removes the unnecessary get/set input/audio functions.

The reason is, that the V4L2 specification says, that if input or audio
cannot be switched anyway, the functions doesn't need to be implemented.

I've tested the new driver with all current radio programs in
Debian/testing and found no problems with that.

In my opinion, the driver is much cleaner by removing these unnecessary
functions.

Signed-off-by: Tobias Lorenz <tobias.lorenz@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2008-10-17 17:22:24 -03:00

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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
*/
/*
* User Notes:
* - USB Audio is provided by the alsa snd_usb_audio module.
* For listing you have to redirect the sound, for example using:
* arecord -D hw:1,0 -r96000 -c2 -f S16_LE | artsdsp aplay -B -
* - regarding module parameters in /sys/module/radio_si470x/parameters:
* the contents of read-only files (0444) are not updated, even if
* space, band and de are changed using private video controls
* - increase tune_timeout, if you often get -EIO errors
* - hw_freq_seek returns -EAGAIN, when timed out or band limit is reached
*/
/*
* 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)
* 2008-01-27 Tobias Lorenz <tobias.lorenz@gmx.net>
* Version 1.0.5
* - number of seek_retries changed to tune_timeout
* - fixed problem with incomplete tune operations by own buffers
* - optimization of variables and printf types
* - improved error logging
* 2008-01-31 Tobias Lorenz <tobias.lorenz@gmx.net>
* Oliver Neukum <oliver@neukum.org>
* Version 1.0.6
* - fixed coverity checker warnings in *_usb_driver_disconnect
* - probe()/open() race by correct ordering in probe()
* - DMA coherency rules by separate allocation of all buffers
* - use of endianness macros
* - abuse of spinlock, replaced by mutex
* - racy handling of timer in disconnect,
* replaced by delayed_work
* - racy interruptible_sleep_on(),
* replaced with wait_event_interruptible()
* - handle signals in read()
* 2008-02-08 Tobias Lorenz <tobias.lorenz@gmx.net>
* Oliver Neukum <oliver@neukum.org>
* Version 1.0.7
* - usb autosuspend support
* - unplugging fixed
* 2008-05-07 Tobias Lorenz <tobias.lorenz@gmx.net>
* Version 1.0.8
* - hardware frequency seek support
* - afc indication
* - more safety checks, let si470x_get_freq return errno
* - vidioc behavior corrected according to v4l2 spec
*
* ToDo:
* - 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_KERNEL_VERSION KERNEL_VERSION(1, 0, 8)
#define DRIVER_CARD "Silicon Labs Si470x FM Radio Receiver"
#define DRIVER_DESC "USB radio driver for Si470x FM Radio Receivers"
#define DRIVER_VERSION "1.0.8"
/* 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 <linux/mutex.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/rds.h>
#include <asm/unaligned.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, 0444);
MODULE_PARM_DESC(radio_nr, "Radio Nr");
/* Spacing (kHz) */
/* 0: 200 kHz (USA, Australia) */
/* 1: 100 kHz (Europe, Japan) */
/* 2: 50 kHz */
static unsigned short space = 2;
module_param(space, ushort, 0444);
MODULE_PARM_DESC(space, "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 unsigned short band = 1;
module_param(band, ushort, 0444);
MODULE_PARM_DESC(band, "Band: 0=87.5..108MHz *1=76..108MHz* 2=76..90MHz");
/* De-emphasis */
/* 0: 75 us (USA) */
/* 1: 50 us (Europe, Australia, Japan) */
static unsigned short de = 1;
module_param(de, ushort, 0444);
MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*");
/* USB timeout */
static unsigned int usb_timeout = 500;
module_param(usb_timeout, uint, 0644);
MODULE_PARM_DESC(usb_timeout, "USB timeout (ms): *500*");
/* Tune timeout */
static unsigned int tune_timeout = 3000;
module_param(tune_timeout, uint, 0644);
MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*");
/* Seek timeout */
static unsigned int seek_timeout = 5000;
module_param(seek_timeout, uint, 0644);
MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*");
/* RDS buffer blocks */
static unsigned int rds_buf = 100;
module_param(rds_buf, uint, 0444);
MODULE_PARM_DESC(rds_buf, "RDS buffer entries: *100*");
/* RDS maximum block errors */
static unsigned short 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, ushort, 0644);
MODULE_PARM_DESC(max_rds_errors, "RDS maximum block errors: *1*");
/* RDS poll frequency */
static unsigned 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, uint, 0644);
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 usb_interface *intf;
struct video_device *videodev;
/* driver management */
unsigned int users;
unsigned char disconnected;
struct mutex disconnect_lock;
/* Silabs internal registers (0..15) */
unsigned short registers[RADIO_REGISTER_NUM];
/* RDS receive buffer */
struct delayed_work work;
wait_queue_head_t read_queue;
struct mutex 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, void *buf, int size)
{
unsigned char *report = (unsigned char *) buf;
int retval;
retval = usb_control_msg(radio->usbdev,
usb_rcvctrlpipe(radio->usbdev, 0),
HID_REQ_GET_REPORT,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
report[0], 2,
buf, size, usb_timeout);
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": si470x_get_report: usb_control_msg returned %d\n",
retval);
return retval;
}
/*
* si470x_set_report - send a HID report
*/
static int si470x_set_report(struct si470x_device *radio, void *buf, int size)
{
unsigned char *report = (unsigned char *) buf;
int retval;
retval = usb_control_msg(radio->usbdev,
usb_sndctrlpipe(radio->usbdev, 0),
HID_REQ_SET_REPORT,
USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
report[0], 2,
buf, size, usb_timeout);
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": si470x_set_report: usb_control_msg returned %d\n",
retval);
return retval;
}
/*
* si470x_get_register - read register
*/
static int si470x_get_register(struct si470x_device *radio, int regnr)
{
unsigned char buf[REGISTER_REPORT_SIZE];
int retval;
buf[0] = REGISTER_REPORT(regnr);
retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
if (retval >= 0)
radio->registers[regnr] = get_unaligned_be16(&buf[1]);
return (retval < 0) ? -EINVAL : 0;
}
/*
* si470x_set_register - write register
*/
static int si470x_set_register(struct si470x_device *radio, int regnr)
{
unsigned char buf[REGISTER_REPORT_SIZE];
int retval;
buf[0] = REGISTER_REPORT(regnr);
put_unaligned_be16(radio->registers[regnr], &buf[1]);
retval = si470x_set_report(radio, (void *) &buf, sizeof(buf));
return (retval < 0) ? -EINVAL : 0;
}
/*
* si470x_get_all_registers - read entire registers
*/
static int si470x_get_all_registers(struct si470x_device *radio)
{
unsigned char buf[ENTIRE_REPORT_SIZE];
int retval;
unsigned char regnr;
buf[0] = ENTIRE_REPORT;
retval = si470x_get_report(radio, (void *) &buf, sizeof(buf));
if (retval >= 0)
for (regnr = 0; regnr < RADIO_REGISTER_NUM; regnr++)
radio->registers[regnr] = get_unaligned_be16(
&buf[regnr * RADIO_REGISTER_SIZE + 1]);
return (retval < 0) ? -EINVAL : 0;
}
/*
* si470x_get_rds_registers - read rds registers
*/
static int si470x_get_rds_registers(struct si470x_device *radio)
{
unsigned char buf[RDS_REPORT_SIZE];
int retval;
int size;
unsigned char regnr;
buf[0] = RDS_REPORT;
retval = usb_interrupt_msg(radio->usbdev,
usb_rcvintpipe(radio->usbdev, 1),
(void *) &buf, sizeof(buf), &size, usb_timeout);
if (size != sizeof(buf))
printk(KERN_WARNING DRIVER_NAME ": si470x_get_rds_registers: "
"return size differs: %d != %zu\n", size, sizeof(buf));
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME ": si470x_get_rds_registers: "
"usb_interrupt_msg returned %d\n", retval);
if (retval >= 0)
for (regnr = 0; regnr < RDS_REGISTER_NUM; regnr++)
radio->registers[STATUSRSSI + regnr] =
get_unaligned_be16(
&buf[regnr * RADIO_REGISTER_SIZE + 1]);
return (retval < 0) ? -EINVAL : 0;
}
/*
* si470x_set_chan - set the channel
*/
static int si470x_set_chan(struct si470x_device *radio, unsigned short chan)
{
int retval;
unsigned long timeout;
bool timed_out = 0;
/* start tuning */
radio->registers[CHANNEL] &= ~CHANNEL_CHAN;
radio->registers[CHANNEL] |= CHANNEL_TUNE | chan;
retval = si470x_set_register(radio, CHANNEL);
if (retval < 0)
goto done;
/* wait till tune operation has completed */
timeout = jiffies + msecs_to_jiffies(tune_timeout);
do {
retval = si470x_get_register(radio, STATUSRSSI);
if (retval < 0)
goto stop;
timed_out = time_after(jiffies, timeout);
} while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
(!timed_out));
if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
printk(KERN_WARNING DRIVER_NAME ": tune does not complete\n");
if (timed_out)
printk(KERN_WARNING DRIVER_NAME
": tune timed out after %u ms\n", tune_timeout);
stop:
/* stop tuning */
radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
retval = si470x_set_register(radio, CHANNEL);
done:
return retval;
}
/*
* si470x_get_freq - get the frequency
*/
static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
{
unsigned int spacing, band_bottom;
unsigned short chan;
int retval;
/* Spacing (kHz) */
switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
/* 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 ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
/* 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);
chan = radio->registers[READCHAN] & READCHAN_READCHAN;
/* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
*freq = chan * spacing + band_bottom;
return retval;
}
/*
* si470x_set_freq - set the frequency
*/
static int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
{
unsigned int spacing, band_bottom;
unsigned short chan;
/* Spacing (kHz) */
switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
/* 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 ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
/* 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_set_seek - set seek
*/
static int si470x_set_seek(struct si470x_device *radio,
unsigned int wrap_around, unsigned int seek_upward)
{
int retval = 0;
unsigned long timeout;
bool timed_out = 0;
/* start seeking */
radio->registers[POWERCFG] |= POWERCFG_SEEK;
if (wrap_around == 1)
radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
else
radio->registers[POWERCFG] |= POWERCFG_SKMODE;
if (seek_upward == 1)
radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
else
radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
retval = si470x_set_register(radio, POWERCFG);
if (retval < 0)
goto done;
/* wait till seek operation has completed */
timeout = jiffies + msecs_to_jiffies(seek_timeout);
do {
retval = si470x_get_register(radio, STATUSRSSI);
if (retval < 0)
goto stop;
timed_out = time_after(jiffies, timeout);
} while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) &&
(!timed_out));
if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
printk(KERN_WARNING DRIVER_NAME ": seek does not complete\n");
if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
printk(KERN_WARNING DRIVER_NAME
": seek failed / band limit reached\n");
if (timed_out)
printk(KERN_WARNING DRIVER_NAME
": seek timed out after %u ms\n", seek_timeout);
stop:
/* stop seeking */
radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
retval = si470x_set_register(radio, POWERCFG);
done:
/* try again, if timed out */
if ((retval == 0) && timed_out)
retval = -EAGAIN;
return retval;
}
/*
* 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)
goto done;
/* sysconfig 1 */
radio->registers[SYSCONFIG1] = SYSCONFIG1_DE;
retval = si470x_set_register(radio, SYSCONFIG1);
if (retval < 0)
goto done;
/* sysconfig 2 */
radio->registers[SYSCONFIG2] =
(0x3f << 8) | /* SEEKTH */
((band << 6) & SYSCONFIG2_BAND) | /* BAND */
((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */
15; /* VOLUME (max) */
retval = si470x_set_register(radio, SYSCONFIG2);
if (retval < 0)
goto done;
/* reset last channel */
retval = si470x_set_chan(radio,
radio->registers[CHANNEL] & CHANNEL_CHAN);
done:
return retval;
}
/*
* 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)
goto done;
/* powercfg */
radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
/* POWERCFG_ENABLE has to automatically go low */
radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE;
retval = si470x_set_register(radio, POWERCFG);
done:
return retval;
}
/*
* si470x_rds_on - switch on rds reception
*/
static int si470x_rds_on(struct si470x_device *radio)
{
int retval;
/* sysconfig 1 */
mutex_lock(&radio->lock);
radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
retval = si470x_set_register(radio, SYSCONFIG1);
if (retval < 0)
radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
mutex_unlock(&radio->lock);
return retval;
}
/**************************************************************************
* RDS Driver Functions
**************************************************************************/
/*
* si470x_rds - rds processing function
*/
static void si470x_rds(struct si470x_device *radio)
{
unsigned char blocknum;
unsigned short bler; /* rds block errors */
unsigned short rds;
unsigned char tmpbuf[3];
/* 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 all four RDS blocks to internal buffer */
mutex_lock(&radio->lock);
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 */
put_unaligned_le16(rds, &tmpbuf);
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 */
memcpy(&radio->buffer[radio->wr_index], &tmpbuf, 3);
radio->wr_index += 3;
/* 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;
}
}
mutex_unlock(&radio->lock);
/* wake up read queue */
if (radio->wr_index != radio->rd_index)
wake_up_interruptible(&radio->read_queue);
}
/*
* si470x_work - rds work function
*/
static void si470x_work(struct work_struct *work)
{
struct si470x_device *radio = container_of(work, struct si470x_device,
work.work);
/* safety checks */
if (radio->disconnected)
return;
if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
return;
si470x_rds(radio);
schedule_delayed_work(&radio->work, 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_drvdata(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_delayed_work(&radio->work,
msecs_to_jiffies(rds_poll_time));
}
/* block if no new data available */
while (radio->wr_index == radio->rd_index) {
if (file->f_flags & O_NONBLOCK) {
retval = -EWOULDBLOCK;
goto done;
}
if (wait_event_interruptible(radio->read_queue,
radio->wr_index != radio->rd_index) < 0) {
retval = -EINTR;
goto done;
}
}
/* calculate block count from byte count */
count /= 3;
/* copy RDS block out of internal buffer and to user buffer */
mutex_lock(&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;
}
mutex_unlock(&radio->lock);
done:
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_drvdata(file);
int retval = 0;
/* switch on rds reception */
if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) {
si470x_rds_on(radio);
schedule_delayed_work(&radio->work,
msecs_to_jiffies(rds_poll_time));
}
poll_wait(file, &radio->read_queue, pts);
if (radio->rd_index != radio->wr_index)
retval = POLLIN | POLLRDNORM;
return retval;
}
/*
* si470x_fops_open - file open
*/
static int si470x_fops_open(struct inode *inode, struct file *file)
{
struct si470x_device *radio = video_drvdata(file);
int retval;
lock_kernel();
radio->users++;
retval = usb_autopm_get_interface(radio->intf);
if (retval < 0) {
radio->users--;
retval = -EIO;
goto done;
}
if (radio->users == 1) {
retval = si470x_start(radio);
if (retval < 0)
usb_autopm_put_interface(radio->intf);
}
done:
unlock_kernel();
return retval;
}
/*
* si470x_fops_release - file release
*/
static int si470x_fops_release(struct inode *inode, struct file *file)
{
struct si470x_device *radio = video_drvdata(file);
int retval = 0;
/* safety check */
if (!radio) {
retval = -ENODEV;
goto done;
}
mutex_lock(&radio->disconnect_lock);
radio->users--;
if (radio->users == 0) {
if (radio->disconnected) {
video_unregister_device(radio->videodev);
kfree(radio->buffer);
kfree(radio);
goto unlock;
}
/* stop rds reception */
cancel_delayed_work_sync(&radio->work);
/* cancel read processes */
wake_up_interruptible(&radio->read_queue);
retval = si470x_stop(radio);
usb_autopm_put_interface(radio->intf);
}
unlock:
mutex_unlock(&radio->disconnect_lock);
done:
return retval;
}
/*
* 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,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l_compat_ioctl32,
#endif
.open = si470x_fops_open,
.release = si470x_fops_release,
};
/**************************************************************************
* Video4Linux Interface
**************************************************************************/
/*
* si470x_v4l2_queryctrl - query control
*/
static struct v4l2_queryctrl si470x_v4l2_queryctrl[] = {
{
.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_MUTE,
.type = V4L2_CTRL_TYPE_BOOLEAN,
.name = "Mute",
.minimum = 0,
.maximum = 1,
.step = 1,
.default_value = 1,
},
};
/*
* 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_KERNEL_VERSION;
capability->capabilities = V4L2_CAP_HW_FREQ_SEEK |
V4L2_CAP_TUNER | V4L2_CAP_RADIO;
return 0;
}
/*
* si470x_vidioc_queryctrl - enumerate control items
*/
static int si470x_vidioc_queryctrl(struct file *file, void *priv,
struct v4l2_queryctrl *qc)
{
unsigned char i = 0;
int retval = -EINVAL;
/* abort if qc->id is below V4L2_CID_BASE */
if (qc->id < V4L2_CID_BASE)
goto done;
/* search video control */
for (i = 0; i < ARRAY_SIZE(si470x_v4l2_queryctrl); i++) {
if (qc->id == si470x_v4l2_queryctrl[i].id) {
memcpy(qc, &(si470x_v4l2_queryctrl[i]), sizeof(*qc));
retval = 0; /* found */
break;
}
}
/* disable unsupported base controls */
/* to satisfy kradio and such apps */
if ((retval == -EINVAL) && (qc->id < V4L2_CID_LASTP1)) {
qc->flags = V4L2_CTRL_FLAG_DISABLED;
retval = 0;
}
done:
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": query controls failed with %d\n", retval);
return retval;
}
/*
* 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_drvdata(file);
int retval = 0;
/* safety checks */
if (radio->disconnected) {
retval = -EIO;
goto done;
}
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;
default:
retval = -EINVAL;
}
done:
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": get control failed with %d\n", retval);
return retval;
}
/*
* 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_drvdata(file);
int retval = 0;
/* safety checks */
if (radio->disconnected) {
retval = -EIO;
goto done;
}
switch (ctrl->id) {
case V4L2_CID_AUDIO_VOLUME:
radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
radio->registers[SYSCONFIG2] |= ctrl->value;
retval = si470x_set_register(radio, SYSCONFIG2);
break;
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value == 1)
radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
else
radio->registers[POWERCFG] |= POWERCFG_DMUTE;
retval = si470x_set_register(radio, POWERCFG);
break;
default:
retval = -EINVAL;
}
done:
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": set control failed with %d\n", retval);
return retval;
}
/*
* si470x_vidioc_g_audio - get audio attributes
*/
static int si470x_vidioc_g_audio(struct file *file, void *priv,
struct v4l2_audio *audio)
{
/* driver constants */
audio->index = 0;
strcpy(audio->name, "Radio");
audio->capability = V4L2_AUDCAP_STEREO;
audio->mode = 0;
return 0;
}
/*
* si470x_vidioc_g_tuner - get tuner attributes
*/
static int si470x_vidioc_g_tuner(struct file *file, void *priv,
struct v4l2_tuner *tuner)
{
struct si470x_device *radio = video_drvdata(file);
int retval = 0;
/* safety checks */
if (radio->disconnected) {
retval = -EIO;
goto done;
}
if (tuner->index != 0) {
retval = -EINVAL;
goto done;
}
retval = si470x_get_register(radio, STATUSRSSI);
if (retval < 0)
goto done;
/* driver constants */
strcpy(tuner->name, "FM");
tuner->type = V4L2_TUNER_RADIO;
tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
/* range limits */
switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
/* 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;
};
/* stereo indicator == stereo (instead of mono) */
if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 1)
tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
else
tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
/* mono/stereo selector */
if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 1)
tuner->audmode = V4L2_TUNER_MODE_MONO;
else
tuner->audmode = V4L2_TUNER_MODE_STEREO;
/* 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 */
/* AFCRL does only indicate that freq. differs, not if too low/high */
tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0;
done:
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": get tuner failed with %d\n", retval);
return retval;
}
/*
* 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_drvdata(file);
int retval = -EINVAL;
/* safety checks */
if (radio->disconnected) {
retval = -EIO;
goto done;
}
if (tuner->index != 0)
goto done;
/* mono/stereo selector */
switch (tuner->audmode) {
case V4L2_TUNER_MODE_MONO:
radio->registers[POWERCFG] |= POWERCFG_MONO; /* force mono */
break;
case V4L2_TUNER_MODE_STEREO:
radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
break;
default:
goto done;
}
retval = si470x_set_register(radio, POWERCFG);
done:
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": set tuner failed with %d\n", retval);
return retval;
}
/*
* 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_drvdata(file);
int retval = 0;
/* safety checks */
if (radio->disconnected) {
retval = -EIO;
goto done;
}
if (freq->tuner != 0) {
retval = -EINVAL;
goto done;
}
freq->type = V4L2_TUNER_RADIO;
retval = si470x_get_freq(radio, &freq->frequency);
done:
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": get frequency failed with %d\n", retval);
return retval;
}
/*
* 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_drvdata(file);
int retval = 0;
/* safety checks */
if (radio->disconnected) {
retval = -EIO;
goto done;
}
if (freq->tuner != 0) {
retval = -EINVAL;
goto done;
}
retval = si470x_set_freq(radio, freq->frequency);
done:
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": set frequency failed with %d\n", retval);
return retval;
}
/*
* si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
*/
static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
struct v4l2_hw_freq_seek *seek)
{
struct si470x_device *radio = video_drvdata(file);
int retval = 0;
/* safety checks */
if (radio->disconnected) {
retval = -EIO;
goto done;
}
if (seek->tuner != 0) {
retval = -EINVAL;
goto done;
}
retval = si470x_set_seek(radio, seek->wrap_around, seek->seek_upward);
done:
if (retval < 0)
printk(KERN_WARNING DRIVER_NAME
": set hardware frequency seek failed with %d\n",
retval);
return retval;
}
/*
* si470x_ioctl_ops - video device ioctl operations
*/
static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
.vidioc_querycap = si470x_vidioc_querycap,
.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_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,
.vidioc_s_hw_freq_seek = si470x_vidioc_s_hw_freq_seek,
};
/*
* si470x_viddev_template - video device interface
*/
static struct video_device si470x_viddev_template = {
.fops = &si470x_fops,
.name = DRIVER_NAME,
.release = video_device_release,
.ioctl_ops = &si470x_ioctl_ops,
};
/**************************************************************************
* 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;
int retval = 0;
/* private data allocation and initialization */
radio = kzalloc(sizeof(struct si470x_device), GFP_KERNEL);
if (!radio) {
retval = -ENOMEM;
goto err_initial;
}
radio->users = 0;
radio->disconnected = 0;
radio->usbdev = interface_to_usbdev(intf);
radio->intf = intf;
mutex_init(&radio->disconnect_lock);
mutex_init(&radio->lock);
/* video device allocation and initialization */
radio->videodev = video_device_alloc();
if (!radio->videodev) {
retval = -ENOMEM;
goto err_radio;
}
memcpy(radio->videodev, &si470x_viddev_template,
sizeof(si470x_viddev_template));
video_set_drvdata(radio->videodev, radio);
/* show some infos about the specific device */
if (si470x_get_all_registers(radio) < 0) {
retval = -EIO;
goto err_all;
}
printk(KERN_INFO DRIVER_NAME ": DeviceID=0x%4.4hx ChipID=0x%4.4hx\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 "
"firmware version %hu,\n", RADIO_SW_VERSION_CURRENT);
printk(KERN_WARNING DRIVER_NAME
": but the device has firmware version %hu.\n",
radio->registers[CHIPID] & CHIPID_FIRMWARE);
printk(KERN_WARNING DRIVER_NAME
": If you have some trouble using this driver,\n");
printk(KERN_WARNING DRIVER_NAME
": please report to V4L ML at "
"video4linux-list@redhat.com\n");
}
/* set initial frequency */
si470x_set_freq(radio, 87.5 * FREQ_MUL); /* available in all regions */
/* rds buffer allocation */
radio->buf_size = rds_buf * 3;
radio->buffer = kmalloc(radio->buf_size, GFP_KERNEL);
if (!radio->buffer) {
retval = -EIO;
goto err_all;
}
/* rds buffer configuration */
radio->wr_index = 0;
radio->rd_index = 0;
init_waitqueue_head(&radio->read_queue);
/* prepare rds work function */
INIT_DELAYED_WORK(&radio->work, si470x_work);
/* register video device */
retval = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
if (retval) {
printk(KERN_WARNING DRIVER_NAME
": Could not register video device\n");
goto err_all;
}
usb_set_intfdata(intf, radio);
return 0;
err_all:
video_device_release(radio->videodev);
kfree(radio->buffer);
err_radio:
kfree(radio);
err_initial:
return retval;
}
/*
* si470x_usb_driver_suspend - suspend the device
*/
static int si470x_usb_driver_suspend(struct usb_interface *intf,
pm_message_t message)
{
struct si470x_device *radio = usb_get_intfdata(intf);
printk(KERN_INFO DRIVER_NAME ": suspending now...\n");
cancel_delayed_work_sync(&radio->work);
return 0;
}
/*
* si470x_usb_driver_resume - resume the device
*/
static int si470x_usb_driver_resume(struct usb_interface *intf)
{
struct si470x_device *radio = usb_get_intfdata(intf);
printk(KERN_INFO DRIVER_NAME ": resuming now...\n");
mutex_lock(&radio->lock);
if (radio->users && radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS)
schedule_delayed_work(&radio->work,
msecs_to_jiffies(rds_poll_time));
mutex_unlock(&radio->lock);
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);
mutex_lock(&radio->disconnect_lock);
radio->disconnected = 1;
cancel_delayed_work_sync(&radio->work);
usb_set_intfdata(intf, NULL);
if (radio->users == 0) {
video_unregister_device(radio->videodev);
kfree(radio->buffer);
kfree(radio);
}
mutex_unlock(&radio->disconnect_lock);
}
/*
* 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,
.suspend = si470x_usb_driver_suspend,
.resume = si470x_usb_driver_resume,
.id_table = si470x_usb_driver_id_table,
.supports_autosuspend = 1,
};
/**************************************************************************
* Module Interface
**************************************************************************/
/*
* si470x_module_init - module init
*/
static int __init si470x_module_init(void)
{
printk(KERN_INFO DRIVER_DESC ", Version " DRIVER_VERSION "\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(DRIVER_VERSION);
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