[linux-block.git] / drivers / media / radio / tea575x.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
 *
 *	Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <media/v4l2-device.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-fh.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include <media/drv-intf/tea575x.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
MODULE_LICENSE("GPL");

/*
 * definitions
 */

#define TEA575X_BIT_SEARCH	(1<<24)		/* 1 = search action, 0 = tuned */
#define TEA575X_BIT_UPDOWN	(1<<23)		/* 0 = search down, 1 = search up */
#define TEA575X_BIT_MONO	(1<<22)		/* 0 = stereo, 1 = mono */
#define TEA575X_BIT_BAND_MASK	(3<<20)
#define TEA575X_BIT_BAND_FM	(0<<20)
#define TEA575X_BIT_BAND_MW	(1<<20)
#define TEA575X_BIT_BAND_LW	(2<<20)
#define TEA575X_BIT_BAND_SW	(3<<20)
#define TEA575X_BIT_PORT_0	(1<<19)		/* user bit */
#define TEA575X_BIT_PORT_1	(1<<18)		/* user bit */
#define TEA575X_BIT_SEARCH_MASK	(3<<16)		/* search level */
#define TEA575X_BIT_SEARCH_5_28	     (0<<16)	/* FM >5uV, AM >28uV */
#define TEA575X_BIT_SEARCH_10_40     (1<<16)	/* FM >10uV, AM > 40uV */
#define TEA575X_BIT_SEARCH_30_63     (2<<16)	/* FM >30uV, AM > 63uV */
#define TEA575X_BIT_SEARCH_150_1000  (3<<16)	/* FM > 150uV, AM > 1000uV */
#define TEA575X_BIT_DUMMY	(1<<15)		/* buffer */
#define TEA575X_BIT_FREQ_MASK	0x7fff

enum { BAND_FM, BAND_FM_JAPAN, BAND_AM };

static const struct v4l2_frequency_band bands[] = {
	{
		.type = V4L2_TUNER_RADIO,
		.index = 0,
		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
			      V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   =  87500 * 16,
		.rangehigh  = 108000 * 16,
		.modulation = V4L2_BAND_MODULATION_FM,
	},
	{
		.type = V4L2_TUNER_RADIO,
		.index = 0,
		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
			      V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   = 76000 * 16,
		.rangehigh  = 91000 * 16,
		.modulation = V4L2_BAND_MODULATION_FM,
	},
	{
		.type = V4L2_TUNER_RADIO,
		.index = 1,
		.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_FREQ_BANDS,
		.rangelow   =  530 * 16,
		.rangehigh  = 1710 * 16,
		.modulation = V4L2_BAND_MODULATION_AM,
	},
};

/*
 * lowlevel part
 */

static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
{
	u16 l;
	u8 data;

	if (tea->ops->write_val)
		return tea->ops->write_val(tea, val);

	tea->ops->set_direction(tea, 1);
	udelay(16);

	for (l = 25; l > 0; l--) {
		data = (val >> 24) & TEA575X_DATA;
		val <<= 1;			/* shift data */
		tea->ops->set_pins(tea, data | TEA575X_WREN);
		udelay(2);
		tea->ops->set_pins(tea, data | TEA575X_WREN | TEA575X_CLK);
		udelay(2);
		tea->ops->set_pins(tea, data | TEA575X_WREN);
		udelay(2);
	}

	if (!tea->mute)
		tea->ops->set_pins(tea, 0);
}

static u32 snd_tea575x_read(struct snd_tea575x *tea)
{
	u16 l, rdata;
	u32 data = 0;

	if (tea->ops->read_val)
		return tea->ops->read_val(tea);

	tea->ops->set_direction(tea, 0);
	tea->ops->set_pins(tea, 0);
	udelay(16);

	for (l = 24; l--;) {
		tea->ops->set_pins(tea, TEA575X_CLK);
		udelay(2);
		if (!l)
			tea->tuned = tea->ops->get_pins(tea) & TEA575X_MOST ? 0 : 1;
		tea->ops->set_pins(tea, 0);
		udelay(2);
		data <<= 1;			/* shift data */
		rdata = tea->ops->get_pins(tea);
		if (!l)
			tea->stereo = (rdata & TEA575X_MOST) ?  0 : 1;
		if (rdata & TEA575X_DATA)
			data++;
		udelay(2);
	}

	if (tea->mute)
		tea->ops->set_pins(tea, TEA575X_WREN);

	return data;
}

static u32 snd_tea575x_val_to_freq(struct snd_tea575x *tea, u32 val)
{
	u32 freq = val & TEA575X_BIT_FREQ_MASK;

	if (freq == 0)
		return freq;

	switch (tea->band) {
	case BAND_FM:
		/* freq *= 12.5 */
		freq *= 125;
		freq /= 10;
		/* crystal fixup */
		freq -= TEA575X_FMIF;
		break;
	case BAND_FM_JAPAN:
		/* freq *= 12.5 */
		freq *= 125;
		freq /= 10;
		/* crystal fixup */
		freq += TEA575X_FMIF;
		break;
	case BAND_AM:
		/* crystal fixup */
		freq -= TEA575X_AMIF;
		break;
	}

	return clamp(freq * 16, bands[tea->band].rangelow,
				bands[tea->band].rangehigh); /* from kHz */
}

static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
{
	return snd_tea575x_val_to_freq(tea, snd_tea575x_read(tea));
}

void snd_tea575x_set_freq(struct snd_tea575x *tea)
{
	u32 freq = tea->freq / 16;	/* to kHz */
	u32 band = 0;

	switch (tea->band) {
	case BAND_FM:
		band = TEA575X_BIT_BAND_FM;
		/* crystal fixup */
		freq += TEA575X_FMIF;
		/* freq /= 12.5 */
		freq *= 10;
		freq /= 125;
		break;
	case BAND_FM_JAPAN:
		band = TEA575X_BIT_BAND_FM;
		/* crystal fixup */
		freq -= TEA575X_FMIF;
		/* freq /= 12.5 */
		freq *= 10;
		freq /= 125;
		break;
	case BAND_AM:
		band = TEA575X_BIT_BAND_MW;
		/* crystal fixup */
		freq += TEA575X_AMIF;
		break;
	}

	tea->val &= ~(TEA575X_BIT_FREQ_MASK | TEA575X_BIT_BAND_MASK);
	tea->val |= band;
	tea->val |= freq & TEA575X_BIT_FREQ_MASK;
	snd_tea575x_write(tea, tea->val);
	tea->freq = snd_tea575x_val_to_freq(tea, tea->val);
}
EXPORT_SYMBOL(snd_tea575x_set_freq);

/*
 * Linux Video interface
 */

static int vidioc_querycap(struct file *file, void  *priv,
					struct v4l2_capability *v)
{
	struct snd_tea575x *tea = video_drvdata(file);

	strscpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver));
	strscpy(v->card, tea->card, sizeof(v->card));
	strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card));
	strscpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
	return 0;
}

int snd_tea575x_enum_freq_bands(struct snd_tea575x *tea,
					struct v4l2_frequency_band *band)
{
	int index;

	if (band->tuner != 0)
		return -EINVAL;

	switch (band->index) {
	case 0:
		if (tea->tea5759)
			index = BAND_FM_JAPAN;
		else
			index = BAND_FM;
		break;
	case 1:
		if (tea->has_am) {
			index = BAND_AM;
			break;
		}
		fallthrough;
	default:
		return -EINVAL;
	}

	*band = bands[index];
	if (!tea->cannot_read_data)
		band->capability |= V4L2_TUNER_CAP_HWSEEK_BOUNDED;

	return 0;
}
EXPORT_SYMBOL(snd_tea575x_enum_freq_bands);

static int vidioc_enum_freq_bands(struct file *file, void *priv,
					 struct v4l2_frequency_band *band)
{
	struct snd_tea575x *tea = video_drvdata(file);

	return snd_tea575x_enum_freq_bands(tea, band);
}

int snd_tea575x_g_tuner(struct snd_tea575x *tea, struct v4l2_tuner *v)
{
	struct v4l2_frequency_band band_fm = { 0, };

	if (v->index > 0)
		return -EINVAL;

	snd_tea575x_read(tea);
	snd_tea575x_enum_freq_bands(tea, &band_fm);

	memset(v, 0, sizeof(*v));
	strscpy(v->name, tea->has_am ? "FM/AM" : "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;
	v->capability = band_fm.capability;
	v->rangelow = tea->has_am ? bands[BAND_AM].rangelow : band_fm.rangelow;
	v->rangehigh = band_fm.rangehigh;
	v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
	v->audmode = (tea->val & TEA575X_BIT_MONO) ?
		V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
	v->signal = tea->tuned ? 0xffff : 0;
	return 0;
}
EXPORT_SYMBOL(snd_tea575x_g_tuner);

static int vidioc_g_tuner(struct file *file, void *priv,
					struct v4l2_tuner *v)
{
	struct snd_tea575x *tea = video_drvdata(file);

	return snd_tea575x_g_tuner(tea, v);
}

static int vidioc_s_tuner(struct file *file, void *priv,
					const struct v4l2_tuner *v)
{
	struct snd_tea575x *tea = video_drvdata(file);
	u32 orig_val = tea->val;

	if (v->index)
		return -EINVAL;
	tea->val &= ~TEA575X_BIT_MONO;
	if (v->audmode == V4L2_TUNER_MODE_MONO)
		tea->val |= TEA575X_BIT_MONO;
	/* Only apply changes if currently tuning FM */
	if (tea->band != BAND_AM && tea->val != orig_val)
		snd_tea575x_set_freq(tea);

	return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
					struct v4l2_frequency *f)
{
	struct snd_tea575x *tea = video_drvdata(file);

	if (f->tuner != 0)
		return -EINVAL;
	f->type = V4L2_TUNER_RADIO;
	f->frequency = tea->freq;
	return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
					const struct v4l2_frequency *f)
{
	struct snd_tea575x *tea = video_drvdata(file);

	if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
		return -EINVAL;

	if (tea->has_am && f->frequency < (20000 * 16))
		tea->band = BAND_AM;
	else if (tea->tea5759)
		tea->band = BAND_FM_JAPAN;
	else
		tea->band = BAND_FM;

	tea->freq = clamp_t(u32, f->frequency, bands[tea->band].rangelow,
					bands[tea->band].rangehigh);
	snd_tea575x_set_freq(tea);
	return 0;
}

int snd_tea575x_s_hw_freq_seek(struct file *file, struct snd_tea575x *tea,
				const struct v4l2_hw_freq_seek *a)
{
	unsigned long timeout;
	int i, spacing;

	if (tea->cannot_read_data)
		return -ENOTTY;
	if (a->tuner || a->wrap_around)
		return -EINVAL;

	if (file->f_flags & O_NONBLOCK)
		return -EWOULDBLOCK;

	if (a->rangelow || a->rangehigh) {
		for (i = 0; i < ARRAY_SIZE(bands); i++) {
			if ((i == BAND_FM && tea->tea5759) ||
			    (i == BAND_FM_JAPAN && !tea->tea5759) ||
			    (i == BAND_AM && !tea->has_am))
				continue;
			if (bands[i].rangelow  == a->rangelow &&
			    bands[i].rangehigh == a->rangehigh)
				break;
		}
		if (i == ARRAY_SIZE(bands))
			return -EINVAL; /* No matching band found */
		if (i != tea->band) {
			tea->band = i;
			tea->freq = clamp(tea->freq, bands[i].rangelow,
						     bands[i].rangehigh);
			snd_tea575x_set_freq(tea);
		}
	}

	spacing = (tea->band == BAND_AM) ? 5 : 50; /* kHz */

	/* clear the frequency, HW will fill it in */
	tea->val &= ~TEA575X_BIT_FREQ_MASK;
	tea->val |= TEA575X_BIT_SEARCH;
	if (a->seek_upward)
		tea->val |= TEA575X_BIT_UPDOWN;
	else
		tea->val &= ~TEA575X_BIT_UPDOWN;
	snd_tea575x_write(tea, tea->val);
	timeout = jiffies + msecs_to_jiffies(10000);
	for (;;) {
		if (time_after(jiffies, timeout))
			break;
		if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
			/* some signal arrived, stop search */
			tea->val &= ~TEA575X_BIT_SEARCH;
			snd_tea575x_set_freq(tea);
			return -ERESTARTSYS;
		}
		if (!(snd_tea575x_read(tea) & TEA575X_BIT_SEARCH)) {
			u32 freq;

			/* Found a frequency, wait until it can be read */
			for (i = 0; i < 100; i++) {
				msleep(10);
				freq = snd_tea575x_get_freq(tea);
				if (freq) /* available */
					break;
			}
			if (freq == 0) /* shouldn't happen */
				break;
			/*
			 * if we moved by less than the spacing, or in the
			 * wrong direction, continue seeking
			 */
			if (abs(tea->freq - freq) < 16 * spacing ||
					(a->seek_upward && freq < tea->freq) ||
					(!a->seek_upward && freq > tea->freq)) {
				snd_tea575x_write(tea, tea->val);
				continue;
			}
			tea->freq = freq;
			tea->val &= ~TEA575X_BIT_SEARCH;
			return 0;
		}
	}
	tea->val &= ~TEA575X_BIT_SEARCH;
	snd_tea575x_set_freq(tea);
	return -ENODATA;
}
EXPORT_SYMBOL(snd_tea575x_s_hw_freq_seek);

static int vidioc_s_hw_freq_seek(struct file *file, void *fh,
					const struct v4l2_hw_freq_seek *a)
{
	struct snd_tea575x *tea = video_drvdata(file);

	return snd_tea575x_s_hw_freq_seek(file, tea, a);
}

static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
{
	struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
		tea->mute = ctrl->val;
		snd_tea575x_set_freq(tea);
		return 0;
	}

	return -EINVAL;
}

static const struct v4l2_file_operations tea575x_fops = {
	.unlocked_ioctl	= video_ioctl2,
	.open           = v4l2_fh_open,
	.release        = v4l2_fh_release,
	.poll           = v4l2_ctrl_poll,
};

static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
	.vidioc_querycap    = vidioc_querycap,
	.vidioc_g_tuner     = vidioc_g_tuner,
	.vidioc_s_tuner     = vidioc_s_tuner,
	.vidioc_g_frequency = vidioc_g_frequency,
	.vidioc_s_frequency = vidioc_s_frequency,
	.vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
	.vidioc_enum_freq_bands = vidioc_enum_freq_bands,
	.vidioc_log_status  = v4l2_ctrl_log_status,
	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
};

static const struct video_device tea575x_radio = {
	.ioctl_ops	= &tea575x_ioctl_ops,
	.release        = video_device_release_empty,
};

static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
	.s_ctrl = tea575x_s_ctrl,
};


int snd_tea575x_hw_init(struct snd_tea575x *tea)
{
	tea->mute = true;

	/* Not all devices can or know how to read the data back.
	   Such devices can set cannot_read_data to true. */
	if (!tea->cannot_read_data) {
		snd_tea575x_write(tea, 0x55AA);
		if (snd_tea575x_read(tea) != 0x55AA)
			return -ENODEV;
	}

	tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_5_28;
	tea->freq = 90500 * 16;		/* 90.5Mhz default */
	snd_tea575x_set_freq(tea);

	return 0;
}
EXPORT_SYMBOL(snd_tea575x_hw_init);

int snd_tea575x_init(struct snd_tea575x *tea, struct module *owner)
{
	int retval = snd_tea575x_hw_init(tea);

	if (retval)
		return retval;

	tea->vd = tea575x_radio;
	video_set_drvdata(&tea->vd, tea);
	mutex_init(&tea->mutex);
	strscpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name));
	tea->vd.lock = &tea->mutex;
	tea->vd.v4l2_dev = tea->v4l2_dev;
	tea->vd.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
	if (!tea->cannot_read_data)
		tea->vd.device_caps |= V4L2_CAP_HW_FREQ_SEEK;
	tea->fops = tea575x_fops;
	tea->fops.owner = owner;
	tea->vd.fops = &tea->fops;
	/* disable hw_freq_seek if we can't use it */
	if (tea->cannot_read_data)
		v4l2_disable_ioctl(&tea->vd, VIDIOC_S_HW_FREQ_SEEK);

	if (!tea->cannot_mute) {
		tea->vd.ctrl_handler = &tea->ctrl_handler;
		v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
		v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops,
				  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
		retval = tea->ctrl_handler.error;
		if (retval) {
			v4l2_err(tea->v4l2_dev, "can't initialize controls\n");
			v4l2_ctrl_handler_free(&tea->ctrl_handler);
			return retval;
		}

		if (tea->ext_init) {
			retval = tea->ext_init(tea);
			if (retval) {
				v4l2_ctrl_handler_free(&tea->ctrl_handler);
				return retval;
			}
		}

		v4l2_ctrl_handler_setup(&tea->ctrl_handler);
	}

	retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->radio_nr);
	if (retval) {
		v4l2_err(tea->v4l2_dev, "can't register video device!\n");
		v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
		return retval;
	}

	return 0;
}
EXPORT_SYMBOL(snd_tea575x_init);

void snd_tea575x_exit(struct snd_tea575x *tea)
{
	video_unregister_device(&tea->vd);
	v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
}
EXPORT_SYMBOL(snd_tea575x_exit);
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	* ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
	4	*
c1017a4c	5	* Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
4b29631d	6	*/
1da177e4	7
1da177e4	8	#include <linux/delay.h>
da155d5b	9	#include <linux/module.h>
1da177e4	10	#include <linux/init.h>
5a0e3ad6	11	#include <linux/slab.h>
d4ecc83b	12	#include <linux/sched.h>
eab924d0	13	#include <asm/io.h>
d4ecc83b	14	#include <media/v4l2-device.h>
4522e825	15	#include <media/v4l2-dev.h>
d4ecc83b	16	#include <media/v4l2-fh.h>
4522e825	17	#include <media/v4l2-ioctl.h>
d4ecc83b	18	#include <media/v4l2-event.h>
d647f0b7	19	#include <media/drv-intf/tea575x.h>
1da177e4	20
c1017a4c	21	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	22	MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
	23	MODULE_LICENSE("GPL");
	24
	25	/*
	26	* definitions
	27	*/
	28
	29	#define TEA575X_BIT_SEARCH (1<<24) /* 1 = search action, 0 = tuned */
	30	#define TEA575X_BIT_UPDOWN (1<<23) /* 0 = search down, 1 = search up */
	31	#define TEA575X_BIT_MONO (1<<22) /* 0 = stereo, 1 = mono */
	32	#define TEA575X_BIT_BAND_MASK (3<<20)
	33	#define TEA575X_BIT_BAND_FM (0<<20)
	34	#define TEA575X_BIT_BAND_MW (1<<20)
fc488517 HG	35	#define TEA575X_BIT_BAND_LW (2<<20)
fc488517 HG	36	#define TEA575X_BIT_BAND_SW (3<<20)
1da177e4 LT	37	#define TEA575X_BIT_PORT_0 (1<<19) /* user bit */
	38	#define TEA575X_BIT_PORT_1 (1<<18) /* user bit */
	39	#define TEA575X_BIT_SEARCH_MASK (3<<16) /* search level */
	40	#define TEA575X_BIT_SEARCH_5_28 (0<<16) /* FM >5uV, AM >28uV */
	41	#define TEA575X_BIT_SEARCH_10_40 (1<<16) /* FM >10uV, AM > 40uV */
	42	#define TEA575X_BIT_SEARCH_30_63 (2<<16) /* FM >30uV, AM > 63uV */
	43	#define TEA575X_BIT_SEARCH_150_1000 (3<<16) /* FM > 150uV, AM > 1000uV */
	44	#define TEA575X_BIT_DUMMY (1<<15) /* buffer */
	45	#define TEA575X_BIT_FREQ_MASK 0x7fff
	46
fc488517 HG	47	enum { BAND_FM, BAND_FM_JAPAN, BAND_AM };
	48
	49	static const struct v4l2_frequency_band bands[] = {
	50	{
	51	.type = V4L2_TUNER_RADIO,
	52	.index = 0,
	53	.capability = V4L2_TUNER_CAP_LOW \| V4L2_TUNER_CAP_STEREO \|
	54	V4L2_TUNER_CAP_FREQ_BANDS,
	55	.rangelow = 87500 * 16,
	56	.rangehigh = 108000 * 16,
	57	.modulation = V4L2_BAND_MODULATION_FM,
	58	},
	59	{
	60	.type = V4L2_TUNER_RADIO,
	61	.index = 0,
	62	.capability = V4L2_TUNER_CAP_LOW \| V4L2_TUNER_CAP_STEREO \|
	63	V4L2_TUNER_CAP_FREQ_BANDS,
	64	.rangelow = 76000 * 16,
	65	.rangehigh = 91000 * 16,
	66	.modulation = V4L2_BAND_MODULATION_FM,
	67	},
	68	{
	69	.type = V4L2_TUNER_RADIO,
	70	.index = 1,
	71	.capability = V4L2_TUNER_CAP_LOW \| V4L2_TUNER_CAP_FREQ_BANDS,
	72	.rangelow = 530 * 16,
	73	.rangehigh = 1710 * 16,
	74	.modulation = V4L2_BAND_MODULATION_AM,
	75	},
	76	};
	77
1da177e4 LT	78	/*
	79	* lowlevel part
	80	*/
	81
14219d06 OZ	82	static void snd_tea575x_write(struct snd_tea575x *tea, unsigned int val)
	83	{
	84	u16 l;
	85	u8 data;
	86
31a62d41 HG	87	if (tea->ops->write_val)
	88	return tea->ops->write_val(tea, val);
	89
14219d06 OZ	90	tea->ops->set_direction(tea, 1);
	91	udelay(16);
	92
	93	for (l = 25; l > 0; l--) {
	94	data = (val >> 24) & TEA575X_DATA;
	95	val <<= 1; /* shift data */
	96	tea->ops->set_pins(tea, data \| TEA575X_WREN);
	97	udelay(2);
	98	tea->ops->set_pins(tea, data \| TEA575X_WREN \| TEA575X_CLK);
	99	udelay(2);
	100	tea->ops->set_pins(tea, data \| TEA575X_WREN);
	101	udelay(2);
	102	}
	103
	104	if (!tea->mute)
	105	tea->ops->set_pins(tea, 0);
	106	}
	107
bc2b395c	108	static u32 snd_tea575x_read(struct snd_tea575x *tea)
14219d06 OZ	109	{
	110	u16 l, rdata;
	111	u32 data = 0;
	112
31a62d41 HG	113	if (tea->ops->read_val)
	114	return tea->ops->read_val(tea);
	115
14219d06 OZ	116	tea->ops->set_direction(tea, 0);
	117	tea->ops->set_pins(tea, 0);
	118	udelay(16);
	119
	120	for (l = 24; l--;) {
	121	tea->ops->set_pins(tea, TEA575X_CLK);
	122	udelay(2);
	123	if (!l)
	124	tea->tuned = tea->ops->get_pins(tea) & TEA575X_MOST ? 0 : 1;
	125	tea->ops->set_pins(tea, 0);
	126	udelay(2);
	127	data <<= 1; /* shift data */
	128	rdata = tea->ops->get_pins(tea);
	129	if (!l)
	130	tea->stereo = (rdata & TEA575X_MOST) ? 0 : 1;
	131	if (rdata & TEA575X_DATA)
	132	data++;
	133	udelay(2);
	134	}
	135
	136	if (tea->mute)
	137	tea->ops->set_pins(tea, TEA575X_WREN);
	138
	139	return data;
	140	}
	141
40e006ae	142	static u32 snd_tea575x_val_to_freq(struct snd_tea575x *tea, u32 val)
bc2b395c	143	{
40e006ae	144	u32 freq = val & TEA575X_BIT_FREQ_MASK;
bc2b395c HV	145
	146	if (freq == 0)
	147	return freq;
	148
fc488517 HG	149	switch (tea->band) {
	150	case BAND_FM:
	151	/* freq = 12.5 /
	152	freq *= 125;
	153	freq /= 10;
	154	/* crystal fixup */
bc2b395c	155	freq -= TEA575X_FMIF;
fc488517 HG	156	break;
	157	case BAND_FM_JAPAN:
	158	/* freq = 12.5 /
	159	freq *= 125;
	160	freq /= 10;
	161	/* crystal fixup */
	162	freq += TEA575X_FMIF;
	163	break;
	164	case BAND_AM:
	165	/* crystal fixup */
	166	freq -= TEA575X_AMIF;
	167	break;
	168	}
bc2b395c	169
fc488517 HG	170	return clamp(freq * 16, bands[tea->band].rangelow,
fc488517 HG	171	bands[tea->band].rangehigh); /* from kHz */
bc2b395c HV	172	}
bc2b395c HV	173
40e006ae HG	174	static u32 snd_tea575x_get_freq(struct snd_tea575x *tea)
	175	{
	176	return snd_tea575x_val_to_freq(tea, snd_tea575x_read(tea));
	177	}
	178
559c2009	179	void snd_tea575x_set_freq(struct snd_tea575x *tea)
1da177e4	180	{
fc488517 HG	181	u32 freq = tea->freq / 16; /* to kHz */
fc488517 HG	182	u32 band = 0;
1da177e4	183
fc488517 HG	184	switch (tea->band) {
	185	case BAND_FM:
	186	band = TEA575X_BIT_BAND_FM;
	187	/* crystal fixup */
ea27316e	188	freq += TEA575X_FMIF;
fc488517 HG	189	/* freq /= 12.5 */
	190	freq *= 10;
	191	freq /= 125;
	192	break;
	193	case BAND_FM_JAPAN:
	194	band = TEA575X_BIT_BAND_FM;
	195	/* crystal fixup */
	196	freq -= TEA575X_FMIF;
	197	/* freq /= 12.5 */
	198	freq *= 10;
	199	freq /= 125;
	200	break;
	201	case BAND_AM:
	202	band = TEA575X_BIT_BAND_MW;
	203	/* crystal fixup */
	204	freq += TEA575X_AMIF;
	205	break;
	206	}
1da177e4	207
fc488517 HG	208	tea->val &= ~(TEA575X_BIT_FREQ_MASK \| TEA575X_BIT_BAND_MASK);
fc488517 HG	209	tea->val \|= band;
1da177e4	210	tea->val \|= freq & TEA575X_BIT_FREQ_MASK;
14219d06	211	snd_tea575x_write(tea, tea->val);
40e006ae	212	tea->freq = snd_tea575x_val_to_freq(tea, tea->val);
1da177e4	213	}
0e2a706b	214	EXPORT_SYMBOL(snd_tea575x_set_freq);
1da177e4 LT	215
	216	/*
	217	* Linux Video interface
	218	*/
	219
9b76ede4 MCC	220	static int vidioc_querycap(struct file file, void priv,
9b76ede4 MCC	221	struct v4l2_capability *v)
1da177e4	222	{
c170ecf4	223	struct snd_tea575x *tea = video_drvdata(file);
9b76ede4	224
c0decac1 MCC	225	strscpy(v->driver, tea->v4l2_dev->name, sizeof(v->driver));
c0decac1 MCC	226	strscpy(v->card, tea->card, sizeof(v->card));
10ca7201	227	strlcat(v->card, tea->tea5759 ? " TEA5759" : " TEA5757", sizeof(v->card));
c0decac1	228	strscpy(v->bus_info, tea->bus_info, sizeof(v->bus_info));
9b76ede4 MCC	229	return 0;
	230	}
	231
6994ca3d OZ	232	int snd_tea575x_enum_freq_bands(struct snd_tea575x *tea,
6994ca3d OZ	233	struct v4l2_frequency_band *band)
fc488517	234	{
fc488517 HG	235	int index;
	236
	237	if (band->tuner != 0)
	238	return -EINVAL;
	239
	240	switch (band->index) {
	241	case 0:
	242	if (tea->tea5759)
	243	index = BAND_FM_JAPAN;
	244	else
	245	index = BAND_FM;
	246	break;
	247	case 1:
	248	if (tea->has_am) {
	249	index = BAND_AM;
	250	break;
	251	}
df561f66	252	fallthrough;
fc488517 HG	253	default:
	254	return -EINVAL;
	255	}
	256
	257	*band = bands[index];
	258	if (!tea->cannot_read_data)
	259	band->capability \|= V4L2_TUNER_CAP_HWSEEK_BOUNDED;
	260
	261	return 0;
	262	}
6994ca3d	263	EXPORT_SYMBOL(snd_tea575x_enum_freq_bands);
fc488517	264
6994ca3d OZ	265	static int vidioc_enum_freq_bands(struct file file, void priv,
6994ca3d OZ	266	struct v4l2_frequency_band *band)
9b76ede4	267	{
375d1358	268	struct snd_tea575x *tea = video_drvdata(file);
6994ca3d OZ	269
	270	return snd_tea575x_enum_freq_bands(tea, band);
	271	}
	272
	273	int snd_tea575x_g_tuner(struct snd_tea575x tea, struct v4l2_tuner v)
	274	{
fc488517	275	struct v4l2_frequency_band band_fm = { 0, };
375d1358	276
9b76ede4 MCC	277	if (v->index > 0)
	278	return -EINVAL;
	279
14219d06	280	snd_tea575x_read(tea);
6994ca3d	281	snd_tea575x_enum_freq_bands(tea, &band_fm);
375d1358	282
fc488517	283	memset(v, 0, sizeof(*v));
c0decac1	284	strscpy(v->name, tea->has_am ? "FM/AM" : "FM", sizeof(v->name));
9b76ede4	285	v->type = V4L2_TUNER_RADIO;
fc488517 HG	286	v->capability = band_fm.capability;
	287	v->rangelow = tea->has_am ? bands[BAND_AM].rangelow : band_fm.rangelow;
	288	v->rangehigh = band_fm.rangehigh;
d4ecc83b HV	289	v->rxsubchans = tea->stereo ? V4L2_TUNER_SUB_STEREO : V4L2_TUNER_SUB_MONO;
	290	v->audmode = (tea->val & TEA575X_BIT_MONO) ?
	291	V4L2_TUNER_MODE_MONO : V4L2_TUNER_MODE_STEREO;
375d1358	292	v->signal = tea->tuned ? 0xffff : 0;
9b76ede4 MCC	293	return 0;
9b76ede4 MCC	294	}
6994ca3d OZ	295	EXPORT_SYMBOL(snd_tea575x_g_tuner);
	296
	297	static int vidioc_g_tuner(struct file file, void priv,
	298	struct v4l2_tuner *v)
	299	{
	300	struct snd_tea575x *tea = video_drvdata(file);
	301
	302	return snd_tea575x_g_tuner(tea, v);
	303	}
9b76ede4 MCC	304
9b76ede4 MCC	305	static int vidioc_s_tuner(struct file file, void priv,
2f73c7c5	306	const struct v4l2_tuner *v)
9b76ede4	307	{
d4ecc83b	308	struct snd_tea575x *tea = video_drvdata(file);
fc488517	309	u32 orig_val = tea->val;
d4ecc83b HV	310
d4ecc83b HV	311	if (v->index)
9b76ede4	312	return -EINVAL;
d4ecc83b HV	313	tea->val &= ~TEA575X_BIT_MONO;
	314	if (v->audmode == V4L2_TUNER_MODE_MONO)
	315	tea->val \|= TEA575X_BIT_MONO;
fc488517 HG	316	/* Only apply changes if currently tuning FM */
	317	if (tea->band != BAND_AM && tea->val != orig_val)
	318	snd_tea575x_set_freq(tea);
	319
9b76ede4 MCC	320	return 0;
	321	}
	322
	323	static int vidioc_g_frequency(struct file file, void priv,
	324	struct v4l2_frequency *f)
	325	{
	326	struct snd_tea575x *tea = video_drvdata(file);
	327
375d1358 OZ	328	if (f->tuner != 0)
375d1358 OZ	329	return -EINVAL;
9b76ede4 MCC	330	f->type = V4L2_TUNER_RADIO;
	331	f->frequency = tea->freq;
	332	return 0;
	333	}
	334
	335	static int vidioc_s_frequency(struct file file, void priv,
b530a447	336	const struct v4l2_frequency *f)
9b76ede4 MCC	337	{
	338	struct snd_tea575x *tea = video_drvdata(file);
	339
375d1358 OZ	340	if (f->tuner != 0 \|\| f->type != V4L2_TUNER_RADIO)
	341	return -EINVAL;
	342
fc488517 HG	343	if (tea->has_am && f->frequency < (20000 * 16))
	344	tea->band = BAND_AM;
	345	else if (tea->tea5759)
	346	tea->band = BAND_FM_JAPAN;
	347	else
	348	tea->band = BAND_FM;
	349
b530a447	350	tea->freq = clamp_t(u32, f->frequency, bands[tea->band].rangelow,
fc488517	351	bands[tea->band].rangehigh);
9b76ede4	352	snd_tea575x_set_freq(tea);
9b76ede4 MCC	353	return 0;
	354	}
	355
6994ca3d OZ	356	int snd_tea575x_s_hw_freq_seek(struct file file, struct snd_tea575x tea,
6994ca3d OZ	357	const struct v4l2_hw_freq_seek *a)
9b76ede4	358	{
bc2b395c	359	unsigned long timeout;
fc488517	360	int i, spacing;
9b76ede4	361
d4ecc83b HV	362	if (tea->cannot_read_data)
	363	return -ENOTTY;
	364	if (a->tuner \|\| a->wrap_around)
9b76ede4	365	return -EINVAL;
bc2b395c	366
617ade61 HV	367	if (file->f_flags & O_NONBLOCK)
	368	return -EWOULDBLOCK;
	369
fc488517 HG	370	if (a->rangelow \|\| a->rangehigh) {
	371	for (i = 0; i < ARRAY_SIZE(bands); i++) {
	372	if ((i == BAND_FM && tea->tea5759) \|\|
	373	(i == BAND_FM_JAPAN && !tea->tea5759) \|\|
	374	(i == BAND_AM && !tea->has_am))
	375	continue;
	376	if (bands[i].rangelow == a->rangelow &&
	377	bands[i].rangehigh == a->rangehigh)
	378	break;
	379	}
	380	if (i == ARRAY_SIZE(bands))
	381	return -EINVAL; /* No matching band found */
	382	if (i != tea->band) {
	383	tea->band = i;
	384	tea->freq = clamp(tea->freq, bands[i].rangelow,
	385	bands[i].rangehigh);
	386	snd_tea575x_set_freq(tea);
	387	}
	388	}
	389
	390	spacing = (tea->band == BAND_AM) ? 5 : 50; /* kHz */
	391
bc2b395c HV	392	/* clear the frequency, HW will fill it in */
bc2b395c HV	393	tea->val &= ~TEA575X_BIT_FREQ_MASK;
d4ecc83b	394	tea->val \|= TEA575X_BIT_SEARCH;
d4ecc83b HV	395	if (a->seek_upward)
d4ecc83b HV	396	tea->val \|= TEA575X_BIT_UPDOWN;
bc2b395c HV	397	else
bc2b395c HV	398	tea->val &= ~TEA575X_BIT_UPDOWN;
d4ecc83b	399	snd_tea575x_write(tea, tea->val);
bc2b395c	400	timeout = jiffies + msecs_to_jiffies(10000);
d4ecc83b	401	for (;;) {
bc2b395c HV	402	if (time_after(jiffies, timeout))
bc2b395c HV	403	break;
d4ecc83b HV	404	if (schedule_timeout_interruptible(msecs_to_jiffies(10))) {
	405	/* some signal arrived, stop search */
	406	tea->val &= ~TEA575X_BIT_SEARCH;
bc2b395c	407	snd_tea575x_set_freq(tea);
d4ecc83b HV	408	return -ERESTARTSYS;
d4ecc83b HV	409	}
bc2b395c HV	410	if (!(snd_tea575x_read(tea) & TEA575X_BIT_SEARCH)) {
	411	u32 freq;
	412
	413	/* Found a frequency, wait until it can be read */
	414	for (i = 0; i < 100; i++) {
	415	msleep(10);
	416	freq = snd_tea575x_get_freq(tea);
	417	if (freq) /* available */
	418	break;
	419	}
	420	if (freq == 0) /* shouldn't happen */
	421	break;
	422	/*
fc488517 HG	423	* if we moved by less than the spacing, or in the
fc488517 HG	424	* wrong direction, continue seeking
bc2b395c	425	*/
fc488517	426	if (abs(tea->freq - freq) < 16 * spacing \|\|
bc2b395c HV	427	(a->seek_upward && freq < tea->freq) \|\|
	428	(!a->seek_upward && freq > tea->freq)) {
	429	snd_tea575x_write(tea, tea->val);
	430	continue;
	431	}
	432	tea->freq = freq;
	433	tea->val &= ~TEA575X_BIT_SEARCH;
	434	return 0;
	435	}
d4ecc83b	436	}
bc2b395c HV	437	tea->val &= ~TEA575X_BIT_SEARCH;
bc2b395c HV	438	snd_tea575x_set_freq(tea);
54f6019b	439	return -ENODATA;
9b76ede4	440	}
6994ca3d OZ	441	EXPORT_SYMBOL(snd_tea575x_s_hw_freq_seek);
	442
	443	static int vidioc_s_hw_freq_seek(struct file file, void fh,
	444	const struct v4l2_hw_freq_seek *a)
	445	{
	446	struct snd_tea575x *tea = video_drvdata(file);
	447
	448	return snd_tea575x_s_hw_freq_seek(file, tea, a);
	449	}
9b76ede4	450
4522e825	451	static int tea575x_s_ctrl(struct v4l2_ctrl *ctrl)
9b76ede4	452	{
4522e825	453	struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
9b76ede4 MCC	454
	455	switch (ctrl->id) {
	456	case V4L2_CID_AUDIO_MUTE:
4522e825 OZ	457	tea->mute = ctrl->val;
4522e825 OZ	458	snd_tea575x_set_freq(tea);
14219d06	459	return 0;
9b76ede4	460	}
9b76ede4	461
9b76ede4 MCC	462	return -EINVAL;
	463	}
	464
9b76ede4	465	static const struct v4l2_file_operations tea575x_fops = {
6a529c1a	466	.unlocked_ioctl = video_ioctl2,
d4ecc83b HV	467	.open = v4l2_fh_open,
	468	.release = v4l2_fh_release,
	469	.poll = v4l2_ctrl_poll,
9b76ede4 MCC	470	};
	471
	472	static const struct v4l2_ioctl_ops tea575x_ioctl_ops = {
	473	.vidioc_querycap = vidioc_querycap,
	474	.vidioc_g_tuner = vidioc_g_tuner,
	475	.vidioc_s_tuner = vidioc_s_tuner,
9b76ede4 MCC	476	.vidioc_g_frequency = vidioc_g_frequency,
9b76ede4 MCC	477	.vidioc_s_frequency = vidioc_s_frequency,
d4ecc83b	478	.vidioc_s_hw_freq_seek = vidioc_s_hw_freq_seek,
fc488517	479	.vidioc_enum_freq_bands = vidioc_enum_freq_bands,
d4ecc83b HV	480	.vidioc_log_status = v4l2_ctrl_log_status,
	481	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
	482	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
9b76ede4 MCC	483	};
9b76ede4 MCC	484
d4ecc83b	485	static const struct video_device tea575x_radio = {
6e6a8b5a	486	.ioctl_ops = &tea575x_ioctl_ops,
d4ecc83b	487	.release = video_device_release_empty,
4522e825 OZ	488	};
	489
	490	static const struct v4l2_ctrl_ops tea575x_ctrl_ops = {
	491	.s_ctrl = tea575x_s_ctrl,
9b76ede4 MCC	492	};
9b76ede4 MCC	493
1da177e4	494
8fd79579 OZ	495	int snd_tea575x_hw_init(struct snd_tea575x *tea)
8fd79579 OZ	496	{
d4ecc83b	497	tea->mute = true;
14219d06	498
d4ecc83b HV	499	/* Not all devices can or know how to read the data back.
	500	Such devices can set cannot_read_data to true. */
	501	if (!tea->cannot_read_data) {
	502	snd_tea575x_write(tea, 0x55AA);
	503	if (snd_tea575x_read(tea) != 0x55AA)
	504	return -ENODEV;
	505	}
1da177e4	506
bc2b395c	507	tea->val = TEA575X_BIT_BAND_FM \| TEA575X_BIT_SEARCH_5_28;
9b76ede4	508	tea->freq = 90500 * 16; /* 90.5Mhz default */
4522e825	509	snd_tea575x_set_freq(tea);
9b76ede4	510
8fd79579 OZ	511	return 0;
	512	}
	513	EXPORT_SYMBOL(snd_tea575x_hw_init);
	514
	515	int snd_tea575x_init(struct snd_tea575x tea, struct module owner)
	516	{
	517	int retval = snd_tea575x_hw_init(tea);
	518
	519	if (retval)
	520	return retval;
	521
4522e825 OZ	522	tea->vd = tea575x_radio;
4522e825 OZ	523	video_set_drvdata(&tea->vd, tea);
6a529c1a	524	mutex_init(&tea->mutex);
c0decac1	525	strscpy(tea->vd.name, tea->v4l2_dev->name, sizeof(tea->vd.name));
6a529c1a	526	tea->vd.lock = &tea->mutex;
d4ecc83b	527	tea->vd.v4l2_dev = tea->v4l2_dev;
e83ce300 HV	528	tea->vd.device_caps = V4L2_CAP_TUNER \| V4L2_CAP_RADIO;
	529	if (!tea->cannot_read_data)
	530	tea->vd.device_caps \|= V4L2_CAP_HW_FREQ_SEEK;
5daf53a6 HG	531	tea->fops = tea575x_fops;
	532	tea->fops.owner = owner;
	533	tea->vd.fops = &tea->fops;
65397995 HV	534	/* disable hw_freq_seek if we can't use it */
65397995 HV	535	if (tea->cannot_read_data)
152a3a73	536	v4l2_disable_ioctl(&tea->vd, VIDIOC_S_HW_FREQ_SEEK);
1da177e4	537
3d0fe51c HG	538	if (!tea->cannot_mute) {
	539	tea->vd.ctrl_handler = &tea->ctrl_handler;
	540	v4l2_ctrl_handler_init(&tea->ctrl_handler, 1);
	541	v4l2_ctrl_new_std(&tea->ctrl_handler, &tea575x_ctrl_ops,
	542	V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
	543	retval = tea->ctrl_handler.error;
4522e825	544	if (retval) {
3d0fe51c	545	v4l2_err(tea->v4l2_dev, "can't initialize controls\n");
4522e825 OZ	546	v4l2_ctrl_handler_free(&tea->ctrl_handler);
	547	return retval;
	548	}
9b76ede4	549
3d0fe51c HG	550	if (tea->ext_init) {
	551	retval = tea->ext_init(tea);
	552	if (retval) {
	553	v4l2_ctrl_handler_free(&tea->ctrl_handler);
	554	return retval;
	555	}
	556	}
	557
	558	v4l2_ctrl_handler_setup(&tea->ctrl_handler);
	559	}
9b76ede4	560
d4ecc83b	561	retval = video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->radio_nr);
9b76ede4	562	if (retval) {
d4ecc83b	563	v4l2_err(tea->v4l2_dev, "can't register video device!\n");
3d0fe51c	564	v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
14219d06	565	return retval;
9b76ede4	566	}
1da177e4	567
14219d06	568	return 0;
1da177e4	569	}
0e2a706b	570	EXPORT_SYMBOL(snd_tea575x_init);
1da177e4	571
97f02e05	572	void snd_tea575x_exit(struct snd_tea575x *tea)
1da177e4	573	{
4522e825	574	video_unregister_device(&tea->vd);
3d0fe51c	575	v4l2_ctrl_handler_free(tea->vd.ctrl_handler);
1da177e4	576	}
1da177e4	577	EXPORT_SYMBOL(snd_tea575x_exit);