[media] radio-miropcm20: add RDS support (fdcfd4e7) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/media/radio/radio-miropcm20.c

+286 −17

Original line number	Diff line number	Diff line
		/* Miro PCM20 radio driver for Linux radio support
		/*
		* Miro PCM20 radio driver for Linux radio support
		* (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
		* Thanks to Norberto Pellici for the ACI device interface specification
		* The API part is based on the radiotrack driver by M. Kirkwood
		* This driver relies on the aci mixer provided by the snd-miro
		* ALSA driver.
		* Look there for further info...
		*/

		/* What ever you think about the ACI, version 0x07 is not very well!
		* I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
		* conditions... Robert
		*
		* From the original miro RDS sources:
		*
		* (c) 2001 Robert Siemer <Robert.Siemer@gmx.de>
		*
		* Many thanks to Fred Seidel <seidel@metabox.de>, the
		* designer of the RDS decoder hardware. With his help
		* I was able to code this driver.
		* Thanks also to Norberto Pellicci, Dominic Mounteney
		* <DMounteney@pinnaclesys.com> and www.teleauskunft.de
		* for good hints on finding Fred. It was somewhat hard
		* to locate him here in Germany... [:
		*
		* This code has been reintroduced and converted to use
		* the new V4L2 RDS API by:
		*
		* Hans Verkuil <hans.verkuil@cisco.com>
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/delay.h>
		#include <linux/videodev2.h>
		#include <linux/kthread.h>
		#include <media/v4l2-device.h>
		#include <media/v4l2-ioctl.h>
		#include <media/v4l2-ctrls.h>
		@@ -22,6 +37,22 @@
		#include <media/v4l2-event.h>
		#include <sound/aci.h>

		#define RDS_DATASHIFT 2 /* Bit 2 */
		#define RDS_DATAMASK (1 << RDS_DATASHIFT)
		#define RDS_BUSYMASK 0x10 /* Bit 4 */
		#define RDS_CLOCKMASK 0x08 /* Bit 3 */
		#define RDS_DATA(x) (((x) >> RDS_DATASHIFT) & 1)

		#define RDS_STATUS 0x01
		#define RDS_STATIONNAME 0x02
		#define RDS_TEXT 0x03
		#define RDS_ALTFREQ 0x04
		#define RDS_TIMEDATE 0x05
		#define RDS_PI_CODE 0x06
		#define RDS_PTYTATP 0x07
		#define RDS_RESET 0x08
		#define RDS_RXVALUE 0x09

		static int radio_nr = -1;
		module_param(radio_nr, int, 0);
		MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX). Default: -1 (autodetect)");
		@@ -30,6 +61,14 @@ struct pcm20 {
		struct v4l2_device v4l2_dev;
		struct video_device vdev;
		struct v4l2_ctrl_handler ctrl_handler;
		struct v4l2_ctrl *rds_pty;
		struct v4l2_ctrl *rds_ps_name;
		struct v4l2_ctrl *rds_radio_test;
		struct v4l2_ctrl *rds_ta;
		struct v4l2_ctrl *rds_tp;
		struct v4l2_ctrl *rds_ms;
		/* thread for periodic RDS status checking */
		struct task_struct *kthread;
		unsigned long freq;
		u32 audmode;
		struct snd_miro_aci *aci;
		@@ -41,6 +80,103 @@ static struct pcm20 pcm20_card = {
		.audmode = V4L2_TUNER_MODE_STEREO,
		};


		static int rds_waitread(struct snd_miro_aci *aci)
		{
		u8 byte;
		int i = 2000;

		do {
		byte = inb(aci->aci_port + ACI_REG_RDS);
		i--;
		} while ((byte & RDS_BUSYMASK) && i);

		/*
		* It's magic, but without this the data that you read later on
		* is unreliable and full of bit errors. With this 1 usec delay
		* everything is fine.
		*/
		udelay(1);
		return i ? byte : -1;
		}

		static int rds_rawwrite(struct snd_miro_aci *aci, u8 byte)
		{
		if (rds_waitread(aci) >= 0) {
		outb(byte, aci->aci_port + ACI_REG_RDS);
		return 0;
		}
		return -1;
		}

		static int rds_write(struct snd_miro_aci *aci, u8 byte)
		{
		u8 sendbuffer[8];
		int i;

		for (i = 7; i >= 0; i--)
		sendbuffer[7 - i] = (byte & (1 << i)) ? RDS_DATAMASK : 0;
		sendbuffer[0] \|= RDS_CLOCKMASK;

		for (i = 0; i < 8; i++)
		rds_rawwrite(aci, sendbuffer[i]);
		return 0;
		}

		static int rds_readcycle_nowait(struct snd_miro_aci *aci)
		{
		outb(0, aci->aci_port + ACI_REG_RDS);
		return rds_waitread(aci);
		}

		static int rds_readcycle(struct snd_miro_aci *aci)
		{
		if (rds_rawwrite(aci, 0) < 0)
		return -1;
		return rds_waitread(aci);
		}

		static int rds_ack(struct snd_miro_aci *aci)
		{
		int i = rds_readcycle(aci);

		if (i < 0)
		return -1;
		if (i & RDS_DATAMASK)
		return 0; /* ACK */
		return 1; /* NACK */
		}

		static int rds_cmd(struct snd_miro_aci *aci, u8 cmd, u8 databuffer[], u8 datasize)
		{
		int i, j;

		rds_write(aci, cmd);

		/* RDS_RESET doesn't need further processing */
		if (cmd == RDS_RESET)
		return 0;
		if (rds_ack(aci))
		return -EIO;
		if (datasize == 0)
		return 0;

		/* to be able to use rds_readcycle_nowait()
		I have to waitread() here */
		if (rds_waitread(aci) < 0)
		return -1;

		memset(databuffer, 0, datasize);

		for (i = 0; i < 8 * datasize; i++) {
		j = rds_readcycle_nowait(aci);
		if (j < 0)
		return -EIO;
		databuffer[i / 8] \|= RDS_DATA(j) << (7 - (i % 8));
		}
		return 0;
		}

		static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
		{
		unsigned char freql;
		@@ -54,17 +190,10 @@ static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
		freql = freq & 0xff;
		freqh = freq >> 8;

		rds_cmd(aci, RDS_RESET, 0, 0);
		return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
		}

		static const struct v4l2_file_operations pcm20_fops = {
		.owner = THIS_MODULE,
		.open = v4l2_fh_open,
		.poll = v4l2_ctrl_poll,
		.release = v4l2_fh_release,
		.unlocked_ioctl = video_ioctl2,
		};

		static int vidioc_querycap(struct file file, void priv,
		struct v4l2_capability *v)
		{
		@@ -73,16 +202,31 @@ static int vidioc_querycap(struct file file, void priv,
		strlcpy(v->driver, "Miro PCM20", sizeof(v->driver));
		strlcpy(v->card, "Miro PCM20", sizeof(v->card));
		snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
		v->device_caps = V4L2_CAP_TUNER \| V4L2_CAP_RADIO;
		v->device_caps = V4L2_CAP_TUNER \| V4L2_CAP_RADIO \| V4L2_CAP_RDS_CAPTURE;
		v->capabilities = v->device_caps \| V4L2_CAP_DEVICE_CAPS;
		return 0;
		}

		static bool sanitize(char *p, int size)
		{
		int i;
		bool ret = true;

		for (i = 0; i < size; i++) {
		if (p[i] < 32 \|\| p[i] >= 128) {
		p[i] = ' ';
		ret = false;
		}
		}
		return ret;
		}

		static int vidioc_g_tuner(struct file file, void priv,
		struct v4l2_tuner *v)
		{
		struct pcm20 *dev = video_drvdata(file);
		int res;
		u8 buf;

		if (v->index)
		return -EINVAL;
		@@ -97,8 +241,12 @@ static int vidioc_g_tuner(struct file file, void priv,
		res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTEREO, -1, -1);
		v->rxsubchans = (res & 0x40) ? V4L2_TUNER_SUB_MONO :
		V4L2_TUNER_SUB_STEREO;
		v->capability = V4L2_TUNER_CAP_LOW \| V4L2_TUNER_CAP_STEREO;
		v->capability = V4L2_TUNER_CAP_LOW \| V4L2_TUNER_CAP_STEREO \|
		V4L2_TUNER_CAP_RDS \| V4L2_TUNER_CAP_RDS_CONTROLS;
		v->audmode = dev->audmode;
		res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
		if (res >= 0 && buf)
		v->rxsubchans \|= V4L2_TUNER_SUB_RDS;
		return 0;
		}

		@@ -157,6 +305,115 @@ static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl)
		return -EINVAL;
		}

		static int pcm20_thread(void *data)
		{
		struct pcm20 *dev = data;
		const unsigned no_rds_start_counter = 5;
		const unsigned sleep_msecs = 2000;
		unsigned no_rds_counter = no_rds_start_counter;

		for (;;) {
		char text_buffer[66];
		u8 buf;
		int res;

		msleep_interruptible(sleep_msecs);

		if (kthread_should_stop())
		break;

		res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
		if (res)
		continue;
		if (buf == 0) {
		if (no_rds_counter == 0)
		continue;
		no_rds_counter--;
		if (no_rds_counter)
		continue;

		/*
		* No RDS seen for no_rds_start_counter * sleep_msecs
		* milliseconds, clear all RDS controls to their
		* default values.
		*/
		v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, "");
		v4l2_ctrl_s_ctrl(dev->rds_ms, 1);
		v4l2_ctrl_s_ctrl(dev->rds_ta, 0);
		v4l2_ctrl_s_ctrl(dev->rds_tp, 0);
		v4l2_ctrl_s_ctrl(dev->rds_pty, 0);
		v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, "");
		continue;
		}
		no_rds_counter = no_rds_start_counter;

		res = rds_cmd(dev->aci, RDS_STATUS, &buf, 1);
		if (res)
		continue;
		if ((buf >> 3) & 1) {
		res = rds_cmd(dev->aci, RDS_STATIONNAME, text_buffer, 8);
		text_buffer[8] = 0;
		if (!res && sanitize(text_buffer, 8))
		v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, text_buffer);
		}
		if ((buf >> 6) & 1) {
		u8 pty;

		res = rds_cmd(dev->aci, RDS_PTYTATP, &pty, 1);
		if (!res) {
		v4l2_ctrl_s_ctrl(dev->rds_ms, !!(pty & 0x01));
		v4l2_ctrl_s_ctrl(dev->rds_ta, !!(pty & 0x02));
		v4l2_ctrl_s_ctrl(dev->rds_tp, !!(pty & 0x80));
		v4l2_ctrl_s_ctrl(dev->rds_pty, (pty >> 2) & 0x1f);
		}
		}
		if ((buf >> 4) & 1) {
		res = rds_cmd(dev->aci, RDS_TEXT, text_buffer, 65);
		text_buffer[65] = 0;
		if (!res && sanitize(text_buffer + 1, 64))
		v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, text_buffer + 1);
		}
		}
		return 0;
		}

		static int pcm20_open(struct file *file)
		{
		struct pcm20 *dev = video_drvdata(file);
		int res = v4l2_fh_open(file);

		if (!res && v4l2_fh_is_singular_file(file) &&
		IS_ERR_OR_NULL(dev->kthread)) {
		dev->kthread = kthread_run(pcm20_thread, dev, "%s",
		dev->v4l2_dev.name);
		if (IS_ERR(dev->kthread)) {
		v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
		v4l2_fh_release(file);
		return PTR_ERR(dev->kthread);
		}
		}
		return res;
		}

		static int pcm20_release(struct file *file)
		{
		struct pcm20 *dev = video_drvdata(file);

		if (v4l2_fh_is_singular_file(file) && !IS_ERR_OR_NULL(dev->kthread)) {
		kthread_stop(dev->kthread);
		dev->kthread = NULL;
		}
		return v4l2_fh_release(file);
		}

		static const struct v4l2_file_operations pcm20_fops = {
		.owner = THIS_MODULE,
		.open = pcm20_open,
		.poll = v4l2_ctrl_poll,
		.release = pcm20_release,
		.unlocked_ioctl = video_ioctl2,
		};

		static const struct v4l2_ioctl_ops pcm20_ioctl_ops = {
		.vidioc_querycap = vidioc_querycap,
		.vidioc_g_tuner = vidioc_g_tuner,
		@@ -195,9 +452,21 @@ static int __init pcm20_init(void)
		}

		hdl = &dev->ctrl_handler;
		v4l2_ctrl_handler_init(hdl, 1);
		v4l2_ctrl_handler_init(hdl, 7);
		v4l2_ctrl_new_std(hdl, &pcm20_ctrl_ops,
		V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
		dev->rds_pty = v4l2_ctrl_new_std(hdl, NULL,
		V4L2_CID_RDS_RX_PTY, 0, 0x1f, 1, 0);
		dev->rds_ps_name = v4l2_ctrl_new_std(hdl, NULL,
		V4L2_CID_RDS_RX_PS_NAME, 0, 8, 8, 0);
		dev->rds_radio_test = v4l2_ctrl_new_std(hdl, NULL,
		V4L2_CID_RDS_RX_RADIO_TEXT, 0, 64, 64, 0);
		dev->rds_ta = v4l2_ctrl_new_std(hdl, NULL,
		V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT, 0, 1, 1, 0);
		dev->rds_tp = v4l2_ctrl_new_std(hdl, NULL,
		V4L2_CID_RDS_RX_TRAFFIC_PROGRAM, 0, 1, 1, 0);
		dev->rds_ms = v4l2_ctrl_new_std(hdl, NULL,
		V4L2_CID_RDS_RX_MUSIC_SPEECH, 0, 1, 1, 1);
		v4l2_dev->ctrl_handler = hdl;
		if (hdl->error) {
		res = hdl->error;