diff options
Diffstat (limited to 'drivers/media/radio/radio-si470x.c')
| -rw-r--r-- | drivers/media/radio/radio-si470x.c | 1432 |
1 files changed, 1432 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-si470x.c b/drivers/media/radio/radio-si470x.c new file mode 100644 index 000000000000..8e4bd4769048 --- /dev/null +++ b/drivers/media/radio/radio-si470x.c @@ -0,0 +1,1432 @@ +/* + * 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"); |