1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * drivers/media/radio/si470x/radio-si470x.h 4 * 5 * Driver for radios with Silicon Labs Si470x FM Radio Receivers 6 * 7 * Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net> 8 */ 9 10 11 /* driver definitions */ 12 #define DRIVER_NAME "radio-si470x" 13 14 15 /* kernel includes */ 16 #include <linux/kernel.h> 17 #include <linux/module.h> 18 #include <linux/init.h> 19 #include <linux/sched.h> 20 #include <linux/slab.h> 21 #include <linux/input.h> 22 #include <linux/videodev2.h> 23 #include <linux/mutex.h> 24 #include <media/v4l2-common.h> 25 #include <media/v4l2-ioctl.h> 26 #include <media/v4l2-ctrls.h> 27 #include <media/v4l2-event.h> 28 #include <media/v4l2-device.h> 29 #include <linux/unaligned.h> 30 31 32 33 /************************************************************************** 34 * Register Definitions 35 **************************************************************************/ 36 #define RADIO_REGISTER_SIZE 2 /* 16 register bit width */ 37 #define RADIO_REGISTER_NUM 16 /* DEVICEID ... RDSD */ 38 #define RDS_REGISTER_NUM 6 /* STATUSRSSI ... RDSD */ 39 40 #define DEVICEID 0 /* Device ID */ 41 #define DEVICEID_PN 0xf000 /* bits 15..12: Part Number */ 42 #define DEVICEID_MFGID 0x0fff /* bits 11..00: Manufacturer ID */ 43 44 #define SI_CHIPID 1 /* Chip ID */ 45 #define SI_CHIPID_REV 0xfc00 /* bits 15..10: Chip Version */ 46 #define SI_CHIPID_DEV 0x0200 /* bits 09..09: Device */ 47 #define SI_CHIPID_FIRMWARE 0x01ff /* bits 08..00: Firmware Version */ 48 49 #define POWERCFG 2 /* Power Configuration */ 50 #define POWERCFG_DSMUTE 0x8000 /* bits 15..15: Softmute Disable */ 51 #define POWERCFG_DMUTE 0x4000 /* bits 14..14: Mute Disable */ 52 #define POWERCFG_MONO 0x2000 /* bits 13..13: Mono Select */ 53 #define POWERCFG_RDSM 0x0800 /* bits 11..11: RDS Mode (Si4701 only) */ 54 #define POWERCFG_SKMODE 0x0400 /* bits 10..10: Seek Mode */ 55 #define POWERCFG_SEEKUP 0x0200 /* bits 09..09: Seek Direction */ 56 #define POWERCFG_SEEK 0x0100 /* bits 08..08: Seek */ 57 #define POWERCFG_DISABLE 0x0040 /* bits 06..06: Powerup Disable */ 58 #define POWERCFG_ENABLE 0x0001 /* bits 00..00: Powerup Enable */ 59 60 #define CHANNEL 3 /* Channel */ 61 #define CHANNEL_TUNE 0x8000 /* bits 15..15: Tune */ 62 #define CHANNEL_CHAN 0x03ff /* bits 09..00: Channel Select */ 63 64 #define SYSCONFIG1 4 /* System Configuration 1 */ 65 #define SYSCONFIG1_RDSIEN 0x8000 /* bits 15..15: RDS Interrupt Enable (Si4701 only) */ 66 #define SYSCONFIG1_STCIEN 0x4000 /* bits 14..14: Seek/Tune Complete Interrupt Enable */ 67 #define SYSCONFIG1_RDS 0x1000 /* bits 12..12: RDS Enable (Si4701 only) */ 68 #define SYSCONFIG1_DE 0x0800 /* bits 11..11: De-emphasis (0=75us 1=50us) */ 69 #define SYSCONFIG1_AGCD 0x0400 /* bits 10..10: AGC Disable */ 70 #define SYSCONFIG1_BLNDADJ 0x00c0 /* bits 07..06: Stereo/Mono Blend Level Adjustment */ 71 #define SYSCONFIG1_GPIO3 0x0030 /* bits 05..04: General Purpose I/O 3 */ 72 #define SYSCONFIG1_GPIO2 0x000c /* bits 03..02: General Purpose I/O 2 */ 73 #define SYSCONFIG1_GPIO2_DIS 0x0000 /* Disable GPIO 2 interrupt */ 74 #define SYSCONFIG1_GPIO2_INT 0x0004 /* Enable STC/RDS interrupt */ 75 #define SYSCONFIG1_GPIO1 0x0003 /* bits 01..00: General Purpose I/O 1 */ 76 77 #define SYSCONFIG2 5 /* System Configuration 2 */ 78 #define SYSCONFIG2_SEEKTH 0xff00 /* bits 15..08: RSSI Seek Threshold */ 79 #define SYSCONFIG2_BAND 0x00c0 /* bits 07..06: Band Select */ 80 #define SYSCONFIG2_SPACE 0x0030 /* bits 05..04: Channel Spacing */ 81 #define SYSCONFIG2_VOLUME 0x000f /* bits 03..00: Volume */ 82 83 #define SYSCONFIG3 6 /* System Configuration 3 */ 84 #define SYSCONFIG3_SMUTER 0xc000 /* bits 15..14: Softmute Attack/Recover Rate */ 85 #define SYSCONFIG3_SMUTEA 0x3000 /* bits 13..12: Softmute Attenuation */ 86 #define SYSCONFIG3_SKSNR 0x00f0 /* bits 07..04: Seek SNR Threshold */ 87 #define SYSCONFIG3_SKCNT 0x000f /* bits 03..00: Seek FM Impulse Detection Threshold */ 88 89 #define TEST1 7 /* Test 1 */ 90 #define TEST1_AHIZEN 0x4000 /* bits 14..14: Audio High-Z Enable */ 91 92 #define TEST2 8 /* Test 2 */ 93 /* TEST2 only contains reserved bits */ 94 95 #define BOOTCONFIG 9 /* Boot Configuration */ 96 /* BOOTCONFIG only contains reserved bits */ 97 98 #define STATUSRSSI 10 /* Status RSSI */ 99 #define STATUSRSSI_RDSR 0x8000 /* bits 15..15: RDS Ready (Si4701 only) */ 100 #define STATUSRSSI_STC 0x4000 /* bits 14..14: Seek/Tune Complete */ 101 #define STATUSRSSI_SF 0x2000 /* bits 13..13: Seek Fail/Band Limit */ 102 #define STATUSRSSI_AFCRL 0x1000 /* bits 12..12: AFC Rail */ 103 #define STATUSRSSI_RDSS 0x0800 /* bits 11..11: RDS Synchronized (Si4701 only) */ 104 #define STATUSRSSI_BLERA 0x0600 /* bits 10..09: RDS Block A Errors (Si4701 only) */ 105 #define STATUSRSSI_ST 0x0100 /* bits 08..08: Stereo Indicator */ 106 #define STATUSRSSI_RSSI 0x00ff /* bits 07..00: RSSI (Received Signal Strength Indicator) */ 107 108 #define READCHAN 11 /* Read Channel */ 109 #define READCHAN_BLERB 0xc000 /* bits 15..14: RDS Block D Errors (Si4701 only) */ 110 #define READCHAN_BLERC 0x3000 /* bits 13..12: RDS Block C Errors (Si4701 only) */ 111 #define READCHAN_BLERD 0x0c00 /* bits 11..10: RDS Block B Errors (Si4701 only) */ 112 #define READCHAN_READCHAN 0x03ff /* bits 09..00: Read Channel */ 113 114 #define RDSA 12 /* RDSA */ 115 #define RDSA_RDSA 0xffff /* bits 15..00: RDS Block A Data (Si4701 only) */ 116 117 #define RDSB 13 /* RDSB */ 118 #define RDSB_RDSB 0xffff /* bits 15..00: RDS Block B Data (Si4701 only) */ 119 120 #define RDSC 14 /* RDSC */ 121 #define RDSC_RDSC 0xffff /* bits 15..00: RDS Block C Data (Si4701 only) */ 122 123 #define RDSD 15 /* RDSD */ 124 #define RDSD_RDSD 0xffff /* bits 15..00: RDS Block D Data (Si4701 only) */ 125 126 127 128 /************************************************************************** 129 * General Driver Definitions 130 **************************************************************************/ 131 132 /* 133 * si470x_device - private data 134 */ 135 struct si470x_device { 136 struct v4l2_device v4l2_dev; 137 struct video_device videodev; 138 struct v4l2_ctrl_handler hdl; 139 int band; 140 141 /* Silabs internal registers (0..15) */ 142 unsigned short registers[RADIO_REGISTER_NUM]; 143 144 /* RDS receive buffer */ 145 wait_queue_head_t read_queue; 146 struct mutex lock; /* buffer locking */ 147 unsigned char *buffer; /* size is always multiple of three */ 148 unsigned int buf_size; 149 unsigned int rd_index; 150 unsigned int wr_index; 151 152 struct completion completion; 153 bool status_rssi_auto_update; /* Does RSSI get updated automatic? */ 154 155 /* si470x ops */ 156 157 int (*get_register)(struct si470x_device *radio, int regnr); 158 int (*set_register)(struct si470x_device *radio, int regnr); 159 int (*fops_open)(struct file *file); 160 int (*fops_release)(struct file *file); 161 int (*vidioc_querycap)(struct file *file, void *priv, 162 struct v4l2_capability *capability); 163 164 #if IS_ENABLED(CONFIG_USB_SI470X) 165 /* reference to USB and video device */ 166 struct usb_device *usbdev; 167 struct usb_interface *intf; 168 char *usb_buf; 169 170 /* Interrupt endpoint handling */ 171 char *int_in_buffer; 172 struct usb_endpoint_descriptor *int_in_endpoint; 173 struct urb *int_in_urb; 174 int int_in_running; 175 176 /* scratch page */ 177 unsigned char software_version; 178 unsigned char hardware_version; 179 #endif 180 181 #if IS_ENABLED(CONFIG_I2C_SI470X) 182 struct i2c_client *client; 183 struct gpio_desc *gpio_reset; 184 #endif 185 }; 186 187 188 189 /************************************************************************** 190 * Firmware Versions 191 **************************************************************************/ 192 193 #define RADIO_FW_VERSION 12 194 195 196 197 /************************************************************************** 198 * Frequency Multiplicator 199 **************************************************************************/ 200 201 /* 202 * The frequency is set in units of 62.5 Hz when using V4L2_TUNER_CAP_LOW, 203 * 62.5 kHz otherwise. 204 * The tuner is able to have a channel spacing of 50, 100 or 200 kHz. 205 * tuner->capability is therefore set to V4L2_TUNER_CAP_LOW 206 * The FREQ_MUL is then: 1 MHz / 62.5 Hz = 16000 207 */ 208 #define FREQ_MUL (1000000 / 62.5) 209 210 211 212 /************************************************************************** 213 * Common Functions 214 **************************************************************************/ 215 extern const struct video_device si470x_viddev_template; 216 extern const struct v4l2_ctrl_ops si470x_ctrl_ops; 217 int si470x_disconnect_check(struct si470x_device *radio); 218 int si470x_set_freq(struct si470x_device *radio, unsigned int freq); 219 int si470x_start(struct si470x_device *radio); 220 int si470x_stop(struct si470x_device *radio); 221