radio-si470x.c

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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)
 *   - KWorld USB FM Radio SnapMusic Mobile 700 (FM700)
 *
 *  Copyright (c) 2008 Tobias Lorenz <[e-mail]>
 *
 * 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 <[e-mail]>
 *		Version 1.0.0
 *		- First working version
 * 2008-01-13   Tobias Lorenz <[e-mail]>
 *		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 <[e-mail]>
 * 		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 <[e-mail]>
 *		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 <[e-mail]>
 *		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 <[e-mail]>
 *		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 <[e-mail]>
 *		Oliver Neukum <[e-mail]>
 *		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 <[e-mail]>
 *		Oliver Neukum <[e-mail]>
 *		Version 1.0.7
 *		- usb autosuspend support
 *		- unplugging fixed
 * 2008-05-07	Tobias Lorenz <[e-mail]>
 *		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
 * 2008-10-20	Alexey Klimov <[e-mail]>
 * 		- add support for KWorld USB FM Radio FM700
 * 		- blacklisted KWorld radio in hid-core.c and hid-ids.h
 *
 * 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 <[e-mail]>"
#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 "compat.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) },
	/* KWorld USB FM Radio SnapMusic Mobile 700 (FM700) */
	{ USB_DEVICE_AND_INTERFACE_INFO(0x1b80, 0xd700, 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
 **************************************************************************/

/*