229 lines
8.5 KiB
C
229 lines
8.5 KiB
C
/*
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* drivers/media/radio/si470x/radio-si470x.h
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*
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* Driver for radios with Silicon Labs Si470x FM Radio Receivers
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*
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* Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/* driver definitions */
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#define DRIVER_NAME "radio-si470x"
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/* kernel includes */
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/videodev2.h>
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#include <linux/mutex.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-event.h>
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#include <media/v4l2-device.h>
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#include <asm/unaligned.h>
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/**************************************************************************
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* Register Definitions
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**************************************************************************/
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#define RADIO_REGISTER_SIZE 2 /* 16 register bit width */
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#define RADIO_REGISTER_NUM 16 /* DEVICEID ... RDSD */
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#define RDS_REGISTER_NUM 6 /* STATUSRSSI ... RDSD */
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#define DEVICEID 0 /* Device ID */
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#define DEVICEID_PN 0xf000 /* bits 15..12: Part Number */
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#define DEVICEID_MFGID 0x0fff /* bits 11..00: Manufacturer ID */
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#define SI_CHIPID 1 /* Chip ID */
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#define SI_CHIPID_REV 0xfc00 /* bits 15..10: Chip Version */
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#define SI_CHIPID_DEV 0x0200 /* bits 09..09: Device */
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#define SI_CHIPID_FIRMWARE 0x01ff /* bits 08..00: Firmware Version */
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#define POWERCFG 2 /* Power Configuration */
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#define POWERCFG_DSMUTE 0x8000 /* bits 15..15: Softmute Disable */
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#define POWERCFG_DMUTE 0x4000 /* bits 14..14: Mute Disable */
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#define POWERCFG_MONO 0x2000 /* bits 13..13: Mono Select */
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#define POWERCFG_RDSM 0x0800 /* bits 11..11: RDS Mode (Si4701 only) */
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#define POWERCFG_SKMODE 0x0400 /* bits 10..10: Seek Mode */
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#define POWERCFG_SEEKUP 0x0200 /* bits 09..09: Seek Direction */
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#define POWERCFG_SEEK 0x0100 /* bits 08..08: Seek */
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#define POWERCFG_DISABLE 0x0040 /* bits 06..06: Powerup Disable */
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#define POWERCFG_ENABLE 0x0001 /* bits 00..00: Powerup Enable */
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#define CHANNEL 3 /* Channel */
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#define CHANNEL_TUNE 0x8000 /* bits 15..15: Tune */
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#define CHANNEL_CHAN 0x03ff /* bits 09..00: Channel Select */
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#define SYSCONFIG1 4 /* System Configuration 1 */
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#define SYSCONFIG1_RDSIEN 0x8000 /* bits 15..15: RDS Interrupt Enable (Si4701 only) */
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#define SYSCONFIG1_STCIEN 0x4000 /* bits 14..14: Seek/Tune Complete Interrupt Enable */
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#define SYSCONFIG1_RDS 0x1000 /* bits 12..12: RDS Enable (Si4701 only) */
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#define SYSCONFIG1_DE 0x0800 /* bits 11..11: De-emphasis (0=75us 1=50us) */
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#define SYSCONFIG1_AGCD 0x0400 /* bits 10..10: AGC Disable */
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#define SYSCONFIG1_BLNDADJ 0x00c0 /* bits 07..06: Stereo/Mono Blend Level Adjustment */
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#define SYSCONFIG1_GPIO3 0x0030 /* bits 05..04: General Purpose I/O 3 */
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#define SYSCONFIG1_GPIO2 0x000c /* bits 03..02: General Purpose I/O 2 */
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#define SYSCONFIG1_GPIO2_DIS 0x0000 /* Disable GPIO 2 interrupt */
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#define SYSCONFIG1_GPIO2_INT 0x0004 /* Enable STC/RDS interrupt */
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#define SYSCONFIG1_GPIO1 0x0003 /* bits 01..00: General Purpose I/O 1 */
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#define SYSCONFIG2 5 /* System Configuration 2 */
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#define SYSCONFIG2_SEEKTH 0xff00 /* bits 15..08: RSSI Seek Threshold */
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#define SYSCONFIG2_BAND 0x00c0 /* bits 07..06: Band Select */
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#define SYSCONFIG2_SPACE 0x0030 /* bits 05..04: Channel Spacing */
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#define SYSCONFIG2_VOLUME 0x000f /* bits 03..00: Volume */
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#define SYSCONFIG3 6 /* System Configuration 3 */
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#define SYSCONFIG3_SMUTER 0xc000 /* bits 15..14: Softmute Attack/Recover Rate */
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#define SYSCONFIG3_SMUTEA 0x3000 /* bits 13..12: Softmute Attenuation */
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#define SYSCONFIG3_SKSNR 0x00f0 /* bits 07..04: Seek SNR Threshold */
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#define SYSCONFIG3_SKCNT 0x000f /* bits 03..00: Seek FM Impulse Detection Threshold */
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#define TEST1 7 /* Test 1 */
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#define TEST1_AHIZEN 0x4000 /* bits 14..14: Audio High-Z Enable */
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#define TEST2 8 /* Test 2 */
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/* TEST2 only contains reserved bits */
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#define BOOTCONFIG 9 /* Boot Configuration */
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/* BOOTCONFIG only contains reserved bits */
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#define STATUSRSSI 10 /* Status RSSI */
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#define STATUSRSSI_RDSR 0x8000 /* bits 15..15: RDS Ready (Si4701 only) */
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#define STATUSRSSI_STC 0x4000 /* bits 14..14: Seek/Tune Complete */
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#define STATUSRSSI_SF 0x2000 /* bits 13..13: Seek Fail/Band Limit */
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#define STATUSRSSI_AFCRL 0x1000 /* bits 12..12: AFC Rail */
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#define STATUSRSSI_RDSS 0x0800 /* bits 11..11: RDS Synchronized (Si4701 only) */
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#define STATUSRSSI_BLERA 0x0600 /* bits 10..09: RDS Block A Errors (Si4701 only) */
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#define STATUSRSSI_ST 0x0100 /* bits 08..08: Stereo Indicator */
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#define STATUSRSSI_RSSI 0x00ff /* bits 07..00: RSSI (Received Signal Strength Indicator) */
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#define READCHAN 11 /* Read Channel */
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#define READCHAN_BLERB 0xc000 /* bits 15..14: RDS Block D Errors (Si4701 only) */
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#define READCHAN_BLERC 0x3000 /* bits 13..12: RDS Block C Errors (Si4701 only) */
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#define READCHAN_BLERD 0x0c00 /* bits 11..10: RDS Block B Errors (Si4701 only) */
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#define READCHAN_READCHAN 0x03ff /* bits 09..00: Read Channel */
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#define RDSA 12 /* RDSA */
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#define RDSA_RDSA 0xffff /* bits 15..00: RDS Block A Data (Si4701 only) */
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#define RDSB 13 /* RDSB */
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#define RDSB_RDSB 0xffff /* bits 15..00: RDS Block B Data (Si4701 only) */
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#define RDSC 14 /* RDSC */
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#define RDSC_RDSC 0xffff /* bits 15..00: RDS Block C Data (Si4701 only) */
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#define RDSD 15 /* RDSD */
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#define RDSD_RDSD 0xffff /* bits 15..00: RDS Block D Data (Si4701 only) */
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/**************************************************************************
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* General Driver Definitions
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**************************************************************************/
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/*
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* si470x_device - private data
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*/
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struct si470x_device {
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struct v4l2_device v4l2_dev;
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struct video_device videodev;
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struct v4l2_ctrl_handler hdl;
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int band;
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/* Silabs internal registers (0..15) */
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unsigned short registers[RADIO_REGISTER_NUM];
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/* RDS receive buffer */
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wait_queue_head_t read_queue;
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struct mutex lock; /* buffer locking */
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unsigned char *buffer; /* size is always multiple of three */
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unsigned int buf_size;
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unsigned int rd_index;
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unsigned int wr_index;
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struct completion completion;
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bool status_rssi_auto_update; /* Does RSSI get updated automatic? */
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/* si470x ops */
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int (*get_register)(struct si470x_device *radio, int regnr);
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int (*set_register)(struct si470x_device *radio, int regnr);
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int (*fops_open)(struct file *file);
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int (*fops_release)(struct file *file);
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int (*vidioc_querycap)(struct file *file, void *priv,
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struct v4l2_capability *capability);
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#if IS_ENABLED(CONFIG_USB_SI470X)
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/* reference to USB and video device */
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struct usb_device *usbdev;
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struct usb_interface *intf;
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char *usb_buf;
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/* Interrupt endpoint handling */
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char *int_in_buffer;
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struct usb_endpoint_descriptor *int_in_endpoint;
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struct urb *int_in_urb;
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int int_in_running;
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/* scratch page */
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unsigned char software_version;
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unsigned char hardware_version;
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#endif
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#if IS_ENABLED(CONFIG_I2C_SI470X)
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struct i2c_client *client;
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#endif
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};
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/**************************************************************************
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* Firmware Versions
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**************************************************************************/
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#define RADIO_FW_VERSION 12
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/**************************************************************************
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* Frequency Multiplicator
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**************************************************************************/
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/*
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* The frequency is set in units of 62.5 Hz when using V4L2_TUNER_CAP_LOW,
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* 62.5 kHz otherwise.
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* The tuner is able to have a channel spacing of 50, 100 or 200 kHz.
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* tuner->capability is therefore set to V4L2_TUNER_CAP_LOW
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* The FREQ_MUL is then: 1 MHz / 62.5 Hz = 16000
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*/
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#define FREQ_MUL (1000000 / 62.5)
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/**************************************************************************
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* Common Functions
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**************************************************************************/
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extern const struct video_device si470x_viddev_template;
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extern const struct v4l2_ctrl_ops si470x_ctrl_ops;
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int si470x_disconnect_check(struct si470x_device *radio);
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int si470x_set_freq(struct si470x_device *radio, unsigned int freq);
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int si470x_start(struct si470x_device *radio);
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int si470x_stop(struct si470x_device *radio);
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