drivers/media/video/tuner-core.c

/*
 *
 * i2c tv tuner chip device driver
 * core core, i.e. kernel interfaces, registering and so on
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/i2c.h>
#include <linux/types.h>
#include <linux/videodev.h>
#include <linux/init.h>

#include <media/tuner.h>
#include <media/v4l2-common.h>
#include <media/audiochip.h>

#define UNSET (-1U)

/* standard i2c insmod options */
static unsigned short normal_i2c[] = {
	0x42, 0x43, 0x4a, 0x4b,			/* tda8290 */
	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
	I2C_CLIENT_END
};

I2C_CLIENT_INSMOD;

/* insmod options used at init time => read/only */
static unsigned int addr = 0;
static unsigned int no_autodetect = 0;
static unsigned int show_i2c = 0;

/* insmod options used at runtime => read/write */
static unsigned int tuner_debug = 0;
int debug = 0;

static unsigned int tv_range[2] = { 44, 958 };
static unsigned int radio_range[2] = { 65, 108 };

static char pal[] = "--";
static char secam[] = "--";
static char ntsc[] = "-";

module_param(addr, int, 0444);
module_param(no_autodetect, int, 0444);
module_param(show_i2c, int, 0444);
/* Note: tuner_debug is deprecated and will be removed in 2.6.17 */
module_param(tuner_debug, int, 0444);
module_param(debug, int, 0644);

module_param_string(pal, pal, sizeof(pal), 0644);
module_param_string(secam, secam, sizeof(secam), 0644);
module_param_string(ntsc, ntsc, sizeof(ntsc), 0644);
module_param_array(tv_range, int, NULL, 0644);
module_param_array(radio_range, int, NULL, 0644);

MODULE_DESCRIPTION("device driver for various TV and TV+FM radio tuners");
MODULE_AUTHOR("Ralph Metzler, Gerd Knorr, Gunther Mayer");
MODULE_LICENSE("GPL");

static struct i2c_driver driver;
static struct i2c_client client_template;

/* ---------------------------------------------------------------------- */

/* Set tuner frequency,  freq in Units of 62.5kHz = 1/16MHz */
static void set_tv_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);

	if (t->type == UNSET) {
		tuner_warn ("tuner type not set\n");
		return;
	}
	if (NULL == t->tv_freq) {
		tuner_warn ("Tuner has no way to set tv freq\n");
		return;
	}
	if (freq < tv_range[0] * 16 || freq > tv_range[1] * 16) {
		tuner_dbg ("TV freq (%d.%02d) out of range (%d-%d)\n",
			   freq / 16, freq % 16 * 100 / 16, tv_range[0],
			   tv_range[1]);
	}
	t->tv_freq(c, freq);
}

static void set_radio_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);

	if (t->type == UNSET) {
		tuner_warn ("tuner type not set\n");
		return;
	}
	if (NULL == t->radio_freq) {
		tuner_warn ("tuner has no way to set radio frequency\n");
		return;
	}
	if (freq <= radio_range[0] * 16000 || freq >= radio_range[1] * 16000) {
		tuner_dbg ("radio freq (%d.%02d) out of range (%d-%d)\n",
			   freq / 16000, freq % 16000 * 100 / 16000,
			   radio_range[0], radio_range[1]);
	}

	t->radio_freq(c, freq);
	return;
}

static void set_freq(struct i2c_client *c, unsigned long freq)
{
	struct tuner *t = i2c_get_clientdata(c);

	switch (t->mode) {
	case V4L2_TUNER_RADIO:
		tuner_dbg("radio freq set to %lu.%02lu\n",
			  freq / 16000, freq % 16000 * 100 / 16000);
		set_radio_freq(c, freq);
		break;
	case V4L2_TUNER_ANALOG_TV:
	case V4L2_TUNER_DIGITAL_TV:
		tuner_dbg("tv freq set to %lu.%02lu\n",
			  freq / 16, freq % 16 * 100 / 16);
		set_tv_freq(c, freq);
		break;
	}
	t->freq = freq;
}

static void set_type(struct i2c_client *c, unsigned int type,
		     unsigned int new_mode_mask)
{
	struct tuner *t = i2c_get_clientdata(c);
	unsigned char buffer[4];

	if (type == UNSET || type == TUNER_ABSENT) {
		tuner_dbg ("tuner 0x%02x: Tuner type absent\n",c->addr);
		return;
	}

	if (type >= tuner_count) {
		tuner_warn ("tuner 0x%02x: Tuner count greater than %d\n",c->addr,tuner_count);
		return;
	}

	/* This code detects calls by card attach_inform */
	if (NULL == t->i2c.dev.driver) {
		tuner_dbg ("tuner 0x%02x: called during i2c_client register by adapter's attach_inform\n", c->addr);

		t->type=type;
		return;
	}

	t->type = type;

	switch (t->type) {
	case TUNER_MT2032:
		microtune_init(c);
		break;
	case TUNER_PHILIPS_TDA8290:
		tda8290_init(c);
		break;
	case TUNER_TEA5767:
		if (tea5767_tuner_init(c) == EINVAL) {
			t->type = TUNER_ABSENT;
			t->mode_mask = T_UNINITIALIZED;
			return;
		}
		t->mode_mask = T_RADIO;
		break;
	case TUNER_PHILIPS_FMD1216ME_MK3:
		buffer[0] = 0x0b;
		buffer[1] = 0xdc;
		buffer[2] = 0x9c;
		buffer[3] = 0x60;
		i2c_master_send(c, buffer, 4);
		mdelay(1);
		buffer[2] = 0x86;
		buffer[3] = 0x54;
		i2c_master_send(c, buffer, 4);
		default_tuner_init(c);
		break;
	case TUNER_LG_TDVS_H062F:
		/* Set the Auxiliary Byte. */
		buffer[2] &= ~0x20;
		buffer[2] |= 0x18;
		buffer[3] = 0x20;
		i2c_master_send(c, buffer, 4);
		default_tuner_init(c);
		break;
	case TUNER_PHILIPS_TD1316:
		buffer[0] = 0x0b;
		buffer[1] = 0xdc;
		buffer[2] = 0x86;
		buffer[3] = 0xa4;
		i2c_master_send(c,buffer,4);
		default_tuner_init(c);
	default:
		default_tuner_init(c);
		break;
	}

	if (t->mode_mask == T_UNINITIALIZED)
		t->mode_mask = new_mode_mask;

	set_freq(c, t->freq);
	tuner_dbg("%s %s I2C addr 0x%02x with type %d used for 0x%02x\n",
		  c->adapter->name, c->driver->driver.name, c->addr << 1, type,
		  t->mode_mask);
}

/*
 * This function apply tuner config to tuner specified
 * by tun_setup structure. I addr is unset, then admin status
 * and tun addr status is more precise then current status,
 * it's applied. Otherwise status and type are applied only to
 * tuner with exactly the same addr.
*/

static void set_addr(struct i2c_client *c, struct tuner_setup *tun_setup)
{
	struct tuner *t = i2c_get_clientdata(c);

	if ( t->type == UNSET && ((tun_setup->addr == ADDR_UNSET &&
		(t->mode_mask & tun_setup->mode_mask)) ||
		tun_setup->addr == c->addr)) {
			set_type(c, tun_setup->type, tun_setup->mode_mask);
	}
}

static inline int check_mode(struct tuner *t, char *cmd)
{
	if ((1 << t->mode & t->mode_mask) == 0) {
		return EINVAL;
	}

	switch (t->mode) {
	case V4L2_TUNER_RADIO:
		tuner_dbg("Cmd %s accepted for radio\n", cmd);
		break;
	case V4L2_TUNER_ANALOG_TV:
		tuner_dbg("Cmd %s accepted for analog TV\n", cmd);
		break;
	case V4L2_TUNER_DIGITAL_TV:
		tuner_dbg("Cmd %s accepted for digital TV\n", cmd);
		break;
	}
	return 0;
}

/* get more precise norm info from insmod option */
static int tuner_fixup_std(struct tuner *t)
{
	if ((t->std & V4L2_STD_PAL) == V4L2_STD_PAL) {
		switch (pal[0]) {
		case 'b':
		case 'B':
		case 'g':
		case 'G':
			tuner_dbg ("insmod fixup: PAL => PAL-BG\n");
			t->std = V4L2_STD_PAL_BG;
			break;
		case 'i':
		case 'I':
			tuner_dbg ("insmod fixup: PAL => PAL-I\n");
			t->std = V4L2_STD_PAL_I;
			break;
		case 'd':
		case 'D':
		case 'k':
		case 'K':
			tuner_dbg ("insmod fixup: PAL => PAL-DK\n");
			t->std = V4L2_STD_PAL_DK;
			break;
		case 'M':
		case 'm':
			tuner_dbg ("insmod fixup: PAL => PAL-M\n");
			t->std = V4L2_STD_PAL_M;
			break;
		case 'N':
		case 'n':
			if (pal[1] == 'c' || pal[1] == 'C') {
				tuner_dbg("insmod fixup: PAL => PAL-Nc\n");
				t->std = V4L2_STD_PAL_Nc;
			} else {
				tuner_dbg ("insmod fixup: PAL => PAL-N\n");
				t->std = V4L2_STD_PAL_N;
			}
			break;
		case '-':
			/* default parameter, do nothing */
			break;
		default:
			tuner_warn ("pal= argument not recognised\n");
			break;
		}
	}
	if ((t->std & V4L2_STD_SECAM) == V4L2_STD_SECAM) {
		switch (secam[0]) {
		case 'b':
		case 'B':
		case 'g':
		case 'G':
		case 'h':
		case 'H':
			tuner_dbg("insmod fixup: SECAM => SECAM-BGH\n");
			t->std = V4L2_STD_SECAM_B | V4L2_STD_SECAM_G | V4L2_STD_SECAM_H;
			break;
		case 'd':
		case 'D':
		case 'k':
		case 'K':
			tuner_dbg ("insmod fixup: SECAM => SECAM-DK\n");
			t->std = V4L2_STD_SECAM_DK;
			break;
		case 'l':
		case 'L':
			if ((secam[1]=='C')||(secam[1]=='c')) {
				tuner_dbg ("insmod fixup: SECAM => SECAM-L'\n");
				t->std = V4L2_STD_SECAM_LC;
			} else {
				tuner_dbg ("insmod fixup: SECAM => SECAM-L\n");
				t->std = V4L2_STD_SECAM_L;
			}
			break;
		case '-':
			/* default parameter, do nothing */
			break;
		default:
			tuner_warn ("secam= argument not recognised\n");
			break;
		}
	}

	if ((t->std & V4L2_STD_NTSC) == V4L2_STD_NTSC) {
		switch (ntsc[0]) {
		case 'm':
		case 'M':
			tuner_dbg("insmod fixup: NTSC => NTSC-M\n");
			t->std = V4L2_STD_NTSC_M;
			break;
		case 'j':
		case 'J':
			tuner_dbg("insmod fixup: NTSC => NTSC_M_JP\n");
			t->std = V4L2_STD_NTSC_M_JP;
			break;
		case '-':
			/* default parameter, do nothing */
			break;
		default:
			tuner_info("ntsc= argument not recognised\n");
			break;
		}
	}
	return 0;
}

static void tuner_status(struct i2c_client *client)
{
	struct tuner *t = i2c_get_clientdata(client);
	unsigned long freq, freq_fraction;
	const char *p;

	switch (t->mode) {
		case V4L2_TUNER_RADIO: 	    p = "radio"; break;
		case V4L2_TUNER_ANALOG_TV:  p = "analog TV"; break;
		case V4L2_TUNER_DIGITAL_TV: p = "digital TV"; break;
		default: p = "undefined"; break;
	}
	if (t->mode == V4L2_TUNER_RADIO) {
		freq = t->freq / 16000;
		freq_fraction = (t->freq % 16000) * 100 / 16000;
	} else {
		freq = t->freq / 16;
		freq_fraction = (t->freq % 16) * 100 / 16;
	}
	tuner_info("Tuner mode:      %s\n", p);
	tuner_info("Frequency:       %lu.%02lu MHz\n", freq, freq_fraction);
	tuner_info("Standard:        0x%08llx\n", t->std);
	if (t->mode == V4L2_TUNER_RADIO) {
		if (t->has_signal) {
			tuner_info("Signal strength: %d\n", t->has_signal(client));
		}
		if (t->is_stereo) {
			tuner_info("Stereo:          %s\n", t->is_stereo(client) ? "yes" : "no");
		}
	}
}
/* ---------------------------------------------------------------------- */

/* static var Used only in tuner_attach and tuner_probe */
static unsigned default_mode_mask;

/* During client attach, set_type is called by adapter's attach_inform callback.
   set_type must then be completed by tuner_attach.
 */
static int tuner_attach(struct i2c_adapter *adap, int addr, int kind)
{
	struct tuner *t;

	client_template.adapter = adap;
	client_template.addr = addr;

	t = kmalloc(sizeof(struct tuner), GFP_KERNEL);
	if (NULL == t)
		return -ENOMEM;
	memset(t, 0, sizeof(struct tuner));
	memcpy(&t->i2c, &client_template, sizeof(struct i2c_client));
	i2c_set_clientdata(&t->i2c, t);
	t->type = UNSET;
	t->radio_if2 = 10700 * 1000;	/* 10.7MHz - FM radio */
	t->audmode = V4L2_TUNER_MODE_STEREO;
	t->mode_mask = T_UNINITIALIZED;
	if (tuner_debug) {
		debug = tuner_debug;
		printk(KERN_ERR "tuner: tuner_debug is deprecated and will be removed in 2.6.17.\n");
		printk(KERN_ERR "tuner: use the debug option instead.\n");
	}

	if (show_i2c) {
		unsigned char buffer[16];
		int i,rc;

		memset(buffer, 0, sizeof(buffer));
		rc = i2c_master_recv(&t->i2c, buffer, sizeof(buffer));
		tuner_info("I2C RECV = ");
		for (i=0;i<rc;i++)
			printk("%02x ",buffer[i]);
		printk("\n");
	}
	/* TEA5767 autodetection code - only for addr = 0xc0 */
	if (!no_autodetect) {
		switch (addr) {
		case 0x42:
		case 0x43:
		case 0x4a:
		case 0x4b:
			/* If chip is not tda8290, don't register.
			   since it can be tda9887*/
			if (tda8290_probe(&t->i2c) != 0) {
				tuner_dbg("chip at addr %x is not a tda8290\n", addr);
				kfree(t);
				return 0;
			}
			break;
		case 0x60:
			if (tea5767_autodetection(&t->i2c) != EINVAL) {
				t->type = TUNER_TEA5767;
				t->mode_mask = T_RADIO;
				t->mode = T_STANDBY;
				t->freq = 87.5 * 16; /* Sets freq to FM range */
				default_mode_mask &= ~T_RADIO;

				goto register_client;
			}
			break;
		}
	}

	/* Initializes only the first adapter found */
	if (default_mode_mask != T_UNINITIALIZED) {
		tuner_dbg ("Setting mode_mask to 0x%02x\n", default_mode_mask);
		t->mode_mask = default_mode_mask;
		t->freq = 400 * 16; /* Sets freq to VHF High */
		default_mode_mask = T_UNINITIALIZED;
	}

	/* Should be just before return */
register_client:
	tuner_info("chip found @ 0x%x (%s)\n", addr << 1, adap->name);
	i2c_attach_client (&t->i2c);
	set_type (&t->i2c,t->type, t->mode_mask);
	return 0;
}

static int tuner_probe(struct i2c_adapter *adap)
{
	if (0 != addr) {
		normal_i2c[0] = addr;
		normal_i2c[1] = I2C_CLIENT_END;
	}

	default_mode_mask = T_RADIO | T_ANALOG_TV | T_DIGITAL_TV;

	if (adap->class & I2C_CLASS_TV_ANALOG)
		return i2c_probe(adap, &addr_data, tuner_attach);
	return 0;
}

static int tuner_detach(struct i2c_client *client)
{
	struct tuner *t = i2c_get_clientdata(client);
	int err;

	err = i2c_detach_client(&t->i2c);
	if (err) {
		tuner_warn
		    ("Client deregistration failed, client not detached.\n");
		return err;
	}

	kfree(t);
	return 0;
}

/*
 * Switch tuner to other mode. If tuner support both tv and radio,
 * set another frequency to some value (This is needed for some pal
 * tuners to avoid locking). Otherwise, just put second tuner in
 * standby mode.
 */

static inline int set_mode(struct i2c_client *client, struct tuner *t, int mode, char *cmd)
{
	if (mode == t->mode)
		return 0;

	t->mode = mode;

	if (check_mode(t, cmd) == EINVAL) {
		t->mode = T_STANDBY;
		if (t->standby)
			t->standby (client);
		return EINVAL;
	}
	return 0;
}

#define switch_v4l2()	if (!t->using_v4l2) \
			    tuner_dbg("switching to v4l2\n"); \
			t->using_v4l2 = 1;

static inline int check_v4l2(struct tuner *t)
{
	if (t->using_v4l2) {
		tuner_dbg ("ignore v4l1 call\n");
		return EINVAL;
	}
	return 0;
}

static int tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct tuner *t = i2c_get_clientdata(client);

	if (debug>1)
		v4l_i2c_print_ioctl(&(t->i2c),cmd);

	switch (cmd) {
	/* --- configuration --- */
	case TUNER_SET_TYPE_ADDR:
		tuner_dbg ("Calling set_type_addr for type=%d, addr=0x%02x, mode=0x%02x\n",
				((struct tuner_setup *)arg)->type,
				((struct tuner_setup *)arg)->addr,
				((struct tuner_setup *)arg)->mode_mask);

		set_addr(client, (struct tuner_setup *)arg);
		break;
	case AUDC_SET_RADIO:
		set_mode(client,t,V4L2_TUNER_RADIO, "AUDC_SET_RADIO");
		break;
	case TUNER_SET_STANDBY:
		{
			if (check_mode(t, "TUNER_SET_STANDBY") == EINVAL)
				return 0;
			if (t->standby)
				t->standby (client);
			break;
		}
	case VIDIOCSAUDIO:
		if (check_mode(t, "VIDIOCSAUDIO") == EINVAL)
			return 0;
		if (check_v4l2(t) == EINVAL)
			return 0;

		/* Should be implemented, since bttv calls it */
		tuner_dbg("VIDIOCSAUDIO not implemented.\n");

		break;
	/* --- v4l ioctls --- */
	/* take care: bttv does userspace copying, we'll get a
	   kernel pointer here... */
	case VIDIOCSCHAN:
		{
			static const v4l2_std_id map[] = {
				[VIDEO_MODE_PAL] = V4L2_STD_PAL,
				[VIDEO_MODE_NTSC] = V4L2_STD_NTSC_M,
				[VIDEO_MODE_SECAM] = V4L2_STD_SECAM,
				[4 /* bttv */ ] = V4L2_STD_PAL_M,
				[5 /* bttv */ ] = V4L2_STD_PAL_N,
				[6 /* bttv */ ] = V4L2_STD_NTSC_M_JP,
			};
			struct video_channel *vc = arg;

			if (check_v4l2(t) == EINVAL)
				return 0;

			if (set_mode(client,t,V4L2_TUNER_ANALOG_TV, "VIDIOCSCHAN")==EINVAL)
				return 0;

			if (vc->norm < ARRAY_SIZE(map))
				t->std = map[vc->norm];
			tuner_fixup_std(t);
			if (t->freq)
				set_tv_freq(client, t->freq);
			return 0;
		}
	case VIDIOCSFREQ:
		{
			unsigned long *v = arg;

			if (check_mode(t, "VIDIOCSFREQ") == EINVAL)
				return 0;
			if (check_v4l2(t) == EINVAL)
				return 0;

			set_freq(client, *v);
			return 0;
		}
	case VIDIOCGTUNER:
		{
			struct video_tuner *vt = arg;

			if (check_mode(t, "VIDIOCGTUNER") == EINVAL)
				return 0;
			if (check_v4l2(t) == EINVAL)
				return 0;

			if (V4L2_TUNER_RADIO == t->mode) {
				if (t->has_signal)
					vt->signal = t->has_signal(client);
				if (t->is_stereo) {
					if (t->is_stereo(client))
						vt->flags |=
						    VIDEO_TUNER_STEREO_ON;
					else
						vt->flags &=
						    ~VIDEO_TUNER_STEREO_ON;
				}
				vt->flags |= VIDEO_TUNER_LOW;	/* Allow freqs at 62.5 Hz */

				vt->rangelow = radio_range[0] * 16000;
				vt->rangehigh = radio_range[1] * 16000;

			} else {
				vt->rangelow = tv_range[0] * 16;
				vt->rangehigh = tv_range[1] * 16;
			}

			return 0;
		}
	case VIDIOCGAUDIO:
		{
			struct video_audio *va = arg;

			if (check_mode(t, "VIDIOCGAUDIO") == EINVAL)
				return 0;
			if (check_v4l2(t) == EINVAL)
				return 0;

			if (V4L2_TUNER_RADIO == t->mode && t->is_stereo)
				va->mode = t->is_stereo(client)
				    ? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
			return 0;
		}

	case VIDIOC_S_STD:
		{
			v4l2_std_id *id = arg;

			if (set_mode (client, t, V4L2_TUNER_ANALOG_TV, "VIDIOC_S_STD")
					== EINVAL)
				return 0;

			switch_v4l2();

			t->std = *id;
			tuner_fixup_std(t);
			if (t->freq)
				set_freq(client, t->freq);
			break;
		}
	case VIDIOC_S_FREQUENCY:
		{
			struct v4l2_frequency *f = arg;

			t->freq = f->frequency;
			switch_v4l2();
			if (V4L2_TUNER_RADIO == f->type &&
			    V4L2_TUNER_RADIO != t->mode) {
				if (set_mode (client, t, f->type, "VIDIOC_S_FREQUENCY")
					    == EINVAL)
					return 0;
			}
			set_freq(client,t->freq);

			break;
		}
	case VIDIOC_G_FREQUENCY:
		{
			struct v4l2_frequency *f = arg;

			if (check_mode(t, "VIDIOC_G_FREQUENCY") == EINVAL)
				return 0;
			switch_v4l2();
			f->type = t->mode;
			f->frequency = t->freq;
			break;
		}
	case VIDIOC_G_TUNER:
		{
			struct v4l2_tuner *tuner = arg;

			if (check_mode(t, "VIDIOC_G_TUNER") == EINVAL)
				return 0;
			switch_v4l2();

			if (V4L2_TUNER_RADIO == t->mode) {

				if (t->has_signal)
					tuner->signal = t->has_signal(client);

				if (t->is_stereo) {
					if (t->is_stereo(client)) {
						tuner->rxsubchans =
						    V4L2_TUNER_SUB_STEREO |
						    V4L2_TUNER_SUB_MONO;
					} else {
						tuner->rxsubchans =
						    V4L2_TUNER_SUB_MONO;
					}
				}

				tuner->capability |=
				    V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;

				tuner->audmode = t->audmode;

				tuner->rangelow = radio_range[0] * 16000;
				tuner->rangehigh = radio_range[1] * 16000;
			} else {
				tuner->rangelow = tv_range[0] * 16;
				tuner->rangehigh = tv_range[1] * 16;
			}
			break;
		}
	case VIDIOC_S_TUNER:
		{
			struct v4l2_tuner *tuner = arg;

			if (check_mode(t, "VIDIOC_S_TUNER") == EINVAL)
				return 0;

			switch_v4l2();

			if (V4L2_TUNER_RADIO == t->mode) {
				t->audmode = tuner->audmode;
				set_radio_freq(client, t->freq);
			}
			break;
		}
	case VIDIOC_LOG_STATUS:
		tuner_status(client);
		break;
	}

	return 0;
}

static int tuner_suspend(struct device *dev, pm_message_t state)
{
	struct i2c_client *c = container_of (dev, struct i2c_client, dev);
	struct tuner *t = i2c_get_clientdata (c);

	tuner_dbg ("suspend\n");
	/* FIXME: power down ??? */
	return 0;
}

static int tuner_resume(struct device *dev)
{
	struct i2c_client *c = container_of (dev, struct i2c_client, dev);
	struct tuner *t = i2c_get_clientdata (c);

	tuner_dbg ("resume\n");
	if (t->freq)
		set_freq(c, t->freq);
	return 0;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver driver = {
	.id = I2C_DRIVERID_TUNER,
	.attach_adapter = tuner_probe,
	.detach_client = tuner_detach,
	.command = tuner_command,
	.driver = {
		.name    = "tuner",
		.suspend = tuner_suspend,
		.resume  = tuner_resume,
	},
};
static struct i2c_client client_template = {
	.name = "(tuner unset)",
	.driver = &driver,
};

static int __init tuner_init_module(void)
{
	return i2c_add_driver(&driver);
}

static void __exit tuner_cleanup_module(void)
{
	i2c_del_driver(&driver);
}

module_init(tuner_init_module);
module_exit(tuner_cleanup_module);

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */