/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *  drivers/media/radio/si470x/radio-si470x.h
 *
 *  Driver for radios with Silicon Labs Si470x FM Radio Receivers
 *
 *  Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net>
 */


/* driver definitions */
#define DRIVER_NAME "radio-si470x"


/* kernel includes */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/videodev2.h>
#include <linux/mutex.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-event.h>
#include <media/v4l2-device.h>
#include <asm/unaligned.h>


/**************************************************************************
 * 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 SI_CHIPID		1	/* Chip ID */
#define SI_CHIPID_REV		0xfc00	/* bits 15..10: Chip Version */
#define SI_CHIPID_DEV		0x0200	/* bits 09..09: Device */
#define SI_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_GPIO2_DIS	0x0000	/* Disable GPIO 2 interrupt */
#define SYSCONFIG1_GPIO2_INT	0x0004	/* Enable STC/RDS interrupt */
#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		0x00c0	/* 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) */


/**************************************************************************
 * General Driver Definitions
 **************************************************************************/

/*
 * si470x_device - private data
 */
struct si470x_device {
	struct v4l2_device v4l2_dev;
	struct video_device videodev;
	struct v4l2_ctrl_handler hdl;
	int band;

	/* Silabs internal registers (0..15) */
	unsigned short registers[RADIO_REGISTER_NUM];

	/* RDS receive buffer */
	wait_queue_head_t read_queue;
	struct mutex lock;		/* buffer locking */
	unsigned char *buffer;		/* size is always multiple of three */
	unsigned int buf_size;
	unsigned int rd_index;
	unsigned int wr_index;

	struct completion completion;
	bool status_rssi_auto_update;	/* Does RSSI get updated automatic? */

	/* si470x ops */

	int (*get_register)(struct si470x_device *radio, int regnr);
	int (*set_register)(struct si470x_device *radio, int regnr);
	int (*fops_open)(struct file *file);
	int (*fops_release)(struct file *file);
	int (*vidioc_querycap)(struct file *file, void *priv,
			       struct v4l2_capability *capability);

#if IS_ENABLED(CONFIG_USB_SI470X)
	/* reference to USB and video device */
	struct usb_device *usbdev;
	struct usb_interface *intf;
	char *usb_buf;

	/* Interrupt endpoint handling */
	char *int_in_buffer;
	struct usb_endpoint_descriptor *int_in_endpoint;
	struct urb *int_in_urb;
	int int_in_running;

	/* scratch page */
	unsigned char software_version;
	unsigned char hardware_version;
#endif

#if IS_ENABLED(CONFIG_I2C_SI470X)
	struct i2c_client *client;
	struct gpio_desc *gpio_reset;
#endif
};


/**************************************************************************
 * Firmware Versions
 **************************************************************************/

#define RADIO_FW_VERSION	12


/**************************************************************************
 * Frequency Multiplicator
 **************************************************************************/

/*
 * 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)


/**************************************************************************
 * Common Functions
 **************************************************************************/
extern const struct video_device si470x_viddev_template;
extern const struct v4l2_ctrl_ops si470x_ctrl_ops;
int si470x_disconnect_check(struct si470x_device *radio);
int si470x_set_freq(struct si470x_device *radio, unsigned int freq);
int si470x_start(struct si470x_device *radio);
int si470x_stop(struct si470x_device *radio);