drivers/media/radio/si470x/radio-si470x.h

   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 <asm/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);