[mirror_ubuntu-jammy-kernel.git] / drivers / media / dvb-frontends / cx22700.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
    Conexant cx22700 DVB OFDM demodulator driver

    Copyright (C) 2001-2002 Convergence Integrated Media GmbH
	Holger Waechtler <holger@convergence.de>


*/

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <media/dvb_frontend.h>
#include "cx22700.h"


struct cx22700_state {

	struct i2c_adapter* i2c;

	const struct cx22700_config* config;

	struct dvb_frontend frontend;
};


static int debug;
#define dprintk(args...) \
	do { \
		if (debug) printk(KERN_DEBUG "cx22700: " args); \
	} while (0)

static u8 init_tab [] = {
	0x04, 0x10,
	0x05, 0x09,
	0x06, 0x00,
	0x08, 0x04,
	0x09, 0x00,
	0x0a, 0x01,
	0x15, 0x40,
	0x16, 0x10,
	0x17, 0x87,
	0x18, 0x17,
	0x1a, 0x10,
	0x25, 0x04,
	0x2e, 0x00,
	0x39, 0x00,
	0x3a, 0x04,
	0x45, 0x08,
	0x46, 0x02,
	0x47, 0x05,
};


static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
{
	int ret;
	u8 buf [] = { reg, data };
	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };

	dprintk ("%s\n", __func__);

	ret = i2c_transfer (state->i2c, &msg, 1);

	if (ret != 1)
		printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
			__func__, reg, data, ret);

	return (ret != 1) ? -1 : 0;
}

static int cx22700_readreg (struct cx22700_state* state, u8 reg)
{
	int ret;
	u8 b0 [] = { reg };
	u8 b1 [] = { 0 };
	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
			   { .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };

	dprintk ("%s\n", __func__);

	ret = i2c_transfer (state->i2c, msg, 2);

	if (ret != 2) return -EIO;

	return b1[0];
}

static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
{
	u8 val;

	dprintk ("%s\n", __func__);

	switch (inversion) {
	case INVERSION_AUTO:
		return -EOPNOTSUPP;
	case INVERSION_ON:
		val = cx22700_readreg (state, 0x09);
		return cx22700_writereg (state, 0x09, val | 0x01);
	case INVERSION_OFF:
		val = cx22700_readreg (state, 0x09);
		return cx22700_writereg (state, 0x09, val & 0xfe);
	default:
		return -EINVAL;
	}
}

static int cx22700_set_tps(struct cx22700_state *state,
			   struct dtv_frontend_properties *p)
{
	static const u8 qam_tab [4] = { 0, 1, 0, 2 };
	static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
	u8 val;

	dprintk ("%s\n", __func__);

	if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
		return -EINVAL;

	if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
		return -EINVAL;

	if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
		return -EINVAL;

	if ((int)p->guard_interval < GUARD_INTERVAL_1_32 ||
	    p->guard_interval > GUARD_INTERVAL_1_4)
		return -EINVAL;

	if (p->transmission_mode != TRANSMISSION_MODE_2K &&
	    p->transmission_mode != TRANSMISSION_MODE_8K)
		return -EINVAL;

	if (p->modulation != QPSK &&
	    p->modulation != QAM_16 &&
	    p->modulation != QAM_64)
		return -EINVAL;

	if ((int)p->hierarchy < HIERARCHY_NONE ||
	    p->hierarchy > HIERARCHY_4)
		return -EINVAL;

	if (p->bandwidth_hz > 8000000 || p->bandwidth_hz < 6000000)
		return -EINVAL;

	if (p->bandwidth_hz == 7000000)
		cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
	else
		cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));

	val = qam_tab[p->modulation - QPSK];
	val |= p->hierarchy - HIERARCHY_NONE;

	cx22700_writereg (state, 0x04, val);

	if (p->code_rate_HP - FEC_1_2 >= sizeof(fec_tab) ||
	    p->code_rate_LP - FEC_1_2 >= sizeof(fec_tab))
		return -EINVAL;
	val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
	val |= fec_tab[p->code_rate_LP - FEC_1_2];

	cx22700_writereg (state, 0x05, val);

	val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
	val |= p->transmission_mode - TRANSMISSION_MODE_2K;

	cx22700_writereg (state, 0x06, val);

	cx22700_writereg (state, 0x08, 0x04 | 0x02);  /* use user tps parameters */
	cx22700_writereg (state, 0x08, 0x04);         /* restart acquisition */

	return 0;
}

static int cx22700_get_tps(struct cx22700_state *state,
			   struct dtv_frontend_properties *p)
{
	static const enum fe_modulation qam_tab[3] = { QPSK, QAM_16, QAM_64 };
	static const enum fe_code_rate fec_tab[5] = {
		FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8
	};
	u8 val;

	dprintk ("%s\n", __func__);

	if (!(cx22700_readreg(state, 0x07) & 0x20))  /*  tps valid? */
		return -EAGAIN;

	val = cx22700_readreg (state, 0x01);

	if ((val & 0x7) > 4)
		p->hierarchy = HIERARCHY_AUTO;
	else
		p->hierarchy = HIERARCHY_NONE + (val & 0x7);

	if (((val >> 3) & 0x3) > 2)
		p->modulation = QAM_AUTO;
	else
		p->modulation = qam_tab[(val >> 3) & 0x3];

	val = cx22700_readreg (state, 0x02);

	if (((val >> 3) & 0x07) > 4)
		p->code_rate_HP = FEC_AUTO;
	else
		p->code_rate_HP = fec_tab[(val >> 3) & 0x07];

	if ((val & 0x07) > 4)
		p->code_rate_LP = FEC_AUTO;
	else
		p->code_rate_LP = fec_tab[val & 0x07];

	val = cx22700_readreg (state, 0x03);

	p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
	p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);

	return 0;
}

static int cx22700_init (struct dvb_frontend* fe)

{	struct cx22700_state* state = fe->demodulator_priv;
	int i;

	dprintk("cx22700_init: init chip\n");

	cx22700_writereg (state, 0x00, 0x02);   /*  soft reset */
	cx22700_writereg (state, 0x00, 0x00);

	msleep(10);

	for (i=0; i<sizeof(init_tab); i+=2)
		cx22700_writereg (state, init_tab[i], init_tab[i+1]);

	cx22700_writereg (state, 0x00, 0x01);

	return 0;
}

static int cx22700_read_status(struct dvb_frontend *fe, enum fe_status *status)
{
	struct cx22700_state* state = fe->demodulator_priv;

	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
		   | (cx22700_readreg (state, 0x0e) << 1);
	u8 sync = cx22700_readreg (state, 0x07);

	*status = 0;

	if (rs_ber < 0xff00)
		*status |= FE_HAS_SIGNAL;

	if (sync & 0x20)
		*status |= FE_HAS_CARRIER;

	if (sync & 0x10)
		*status |= FE_HAS_VITERBI;

	if (sync & 0x10)
		*status |= FE_HAS_SYNC;

	if (*status == 0x0f)
		*status |= FE_HAS_LOCK;

	return 0;
}

static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
{
	struct cx22700_state* state = fe->demodulator_priv;

	*ber = cx22700_readreg (state, 0x0c) & 0x7f;
	cx22700_writereg (state, 0x0c, 0x00);

	return 0;
}

static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
{
	struct cx22700_state* state = fe->demodulator_priv;

	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
		   | (cx22700_readreg (state, 0x0e) << 1);
	*signal_strength = ~rs_ber;

	return 0;
}

static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
{
	struct cx22700_state* state = fe->demodulator_priv;

	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
		   | (cx22700_readreg (state, 0x0e) << 1);
	*snr = ~rs_ber;

	return 0;
}

static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
	struct cx22700_state* state = fe->demodulator_priv;

	*ucblocks = cx22700_readreg (state, 0x0f);
	cx22700_writereg (state, 0x0f, 0x00);

	return 0;
}

static int cx22700_set_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	struct cx22700_state* state = fe->demodulator_priv;

	cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
	cx22700_writereg (state, 0x00, 0x00);

	if (fe->ops.tuner_ops.set_params) {
		fe->ops.tuner_ops.set_params(fe);
		if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
	}

	cx22700_set_inversion(state, c->inversion);
	cx22700_set_tps(state, c);
	cx22700_writereg (state, 0x37, 0x01);  /* PAL loop filter off */
	cx22700_writereg (state, 0x00, 0x01);  /* restart acquire */

	return 0;
}

static int cx22700_get_frontend(struct dvb_frontend *fe,
				struct dtv_frontend_properties *c)
{
	struct cx22700_state* state = fe->demodulator_priv;
	u8 reg09 = cx22700_readreg (state, 0x09);

	c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
	return cx22700_get_tps(state, c);
}

static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
{
	struct cx22700_state* state = fe->demodulator_priv;

	if (enable) {
		return cx22700_writereg(state, 0x0a, 0x00);
	} else {
		return cx22700_writereg(state, 0x0a, 0x01);
	}
}

static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
{
	fesettings->min_delay_ms = 150;
	fesettings->step_size = 166667;
	fesettings->max_drift = 166667*2;
	return 0;
}

static void cx22700_release(struct dvb_frontend* fe)
{
	struct cx22700_state* state = fe->demodulator_priv;
	kfree(state);
}

static const struct dvb_frontend_ops cx22700_ops;

struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
				    struct i2c_adapter* i2c)
{
	struct cx22700_state* state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);
	if (state == NULL) goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;

	/* check if the demod is there */
	if (cx22700_readreg(state, 0x07) < 0) goto error;

	/* create dvb_frontend */
	memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error:
	kfree(state);
	return NULL;
}

static const struct dvb_frontend_ops cx22700_ops = {
	.delsys = { SYS_DVBT },
	.info = {
		.name			= "Conexant CX22700 DVB-T",
		.frequency_min_hz	= 470 * MHz,
		.frequency_max_hz	= 860 * MHz,
		.frequency_stepsize_hz	= 166667,
		.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
		      FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
		      FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
		      FE_CAN_RECOVER
	},

	.release = cx22700_release,

	.init = cx22700_init,
	.i2c_gate_ctrl = cx22700_i2c_gate_ctrl,

	.set_frontend = cx22700_set_frontend,
	.get_frontend = cx22700_get_frontend,
	.get_tune_settings = cx22700_get_tune_settings,

	.read_status = cx22700_read_status,
	.read_ber = cx22700_read_ber,
	.read_signal_strength = cx22700_read_signal_strength,
	.read_snr = cx22700_read_snr,
	.read_ucblocks = cx22700_read_ucblocks,
};

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");

MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
MODULE_AUTHOR("Holger Waechtler");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(cx22700_attach);
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
	3	Conexant cx22700 DVB OFDM demodulator driver
	4
	5	Copyright (C) 2001-2002 Convergence Integrated Media GmbH
	6	Holger Waechtler <holger@convergence.de>
	7
1da177e4 LT	8
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
1da177e4 LT	14	#include <linux/string.h>
1da177e4 LT	15	#include <linux/slab.h>
fada1935	16	#include <media/dvb_frontend.h>
1da177e4 LT	17	#include "cx22700.h"
	18
	19
	20	struct cx22700_state {
	21
	22	struct i2c_adapter* i2c;
	23
1da177e4 LT	24	const struct cx22700_config* config;
	25
	26	struct dvb_frontend frontend;
	27	};
	28
	29
	30	static int debug;
	31	#define dprintk(args...) \
	32	do { \
	33	if (debug) printk(KERN_DEBUG "cx22700: " args); \
	34	} while (0)
	35
	36	static u8 init_tab [] = {
	37	0x04, 0x10,
	38	0x05, 0x09,
	39	0x06, 0x00,
	40	0x08, 0x04,
	41	0x09, 0x00,
	42	0x0a, 0x01,
	43	0x15, 0x40,
	44	0x16, 0x10,
	45	0x17, 0x87,
	46	0x18, 0x17,
	47	0x1a, 0x10,
	48	0x25, 0x04,
	49	0x2e, 0x00,
	50	0x39, 0x00,
	51	0x3a, 0x04,
	52	0x45, 0x08,
	53	0x46, 0x02,
	54	0x47, 0x05,
	55	};
	56
	57
	58	static int cx22700_writereg (struct cx22700_state* state, u8 reg, u8 data)
	59	{
	60	int ret;
	61	u8 buf [] = { reg, data };
	62	struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
	63
271ddbf7	64	dprintk ("%s\n", __func__);
1da177e4 LT	65
	66	ret = i2c_transfer (state->i2c, &msg, 1);
	67
	68	if (ret != 1)
	69	printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
271ddbf7	70	__func__, reg, data, ret);
1da177e4 LT	71
	72	return (ret != 1) ? -1 : 0;
	73	}
	74
	75	static int cx22700_readreg (struct cx22700_state* state, u8 reg)
	76	{
	77	int ret;
	78	u8 b0 [] = { reg };
	79	u8 b1 [] = { 0 };
	80	struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
	81	{ .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
	82
271ddbf7	83	dprintk ("%s\n", __func__);
1da177e4 LT	84
	85	ret = i2c_transfer (state->i2c, msg, 2);
	86
	87	if (ret != 2) return -EIO;
	88
	89	return b1[0];
	90	}
	91
	92	static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
	93	{
	94	u8 val;
	95
271ddbf7	96	dprintk ("%s\n", __func__);
1da177e4 LT	97
	98	switch (inversion) {
	99	case INVERSION_AUTO:
	100	return -EOPNOTSUPP;
	101	case INVERSION_ON:
	102	val = cx22700_readreg (state, 0x09);
	103	return cx22700_writereg (state, 0x09, val \| 0x01);
	104	case INVERSION_OFF:
	105	val = cx22700_readreg (state, 0x09);
	106	return cx22700_writereg (state, 0x09, val & 0xfe);
	107	default:
	108	return -EINVAL;
	109	}
	110	}
	111
fd607212 MCC	112	static int cx22700_set_tps(struct cx22700_state *state,
fd607212 MCC	113	struct dtv_frontend_properties *p)
1da177e4 LT	114	{
	115	static const u8 qam_tab [4] = { 0, 1, 0, 2 };
	116	static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
	117	u8 val;
	118
271ddbf7	119	dprintk ("%s\n", __func__);
1da177e4 LT	120
	121	if (p->code_rate_HP < FEC_1_2 \|\| p->code_rate_HP > FEC_7_8)
	122	return -EINVAL;
	123
	124	if (p->code_rate_LP < FEC_1_2 \|\| p->code_rate_LP > FEC_7_8)
91a07919	125	return -EINVAL;
1da177e4 LT	126
	127	if (p->code_rate_HP == FEC_4_5 \|\| p->code_rate_LP == FEC_4_5)
	128	return -EINVAL;
	129
830e4b55	130	if ((int)p->guard_interval < GUARD_INTERVAL_1_32 \|\|
1da177e4 LT	131	p->guard_interval > GUARD_INTERVAL_1_4)
	132	return -EINVAL;
	133
	134	if (p->transmission_mode != TRANSMISSION_MODE_2K &&
	135	p->transmission_mode != TRANSMISSION_MODE_8K)
	136	return -EINVAL;
	137
fd607212 MCC	138	if (p->modulation != QPSK &&
	139	p->modulation != QAM_16 &&
	140	p->modulation != QAM_64)
1da177e4 LT	141	return -EINVAL;
1da177e4 LT	142
830e4b55	143	if ((int)p->hierarchy < HIERARCHY_NONE \|\|
fd607212	144	p->hierarchy > HIERARCHY_4)
1da177e4 LT	145	return -EINVAL;
1da177e4 LT	146
fd607212	147	if (p->bandwidth_hz > 8000000 \|\| p->bandwidth_hz < 6000000)
1da177e4 LT	148	return -EINVAL;
1da177e4 LT	149
fd607212	150	if (p->bandwidth_hz == 7000000)
1da177e4 LT	151	cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 \| 0x10));
	152	else
	153	cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
	154
fd607212 MCC	155	val = qam_tab[p->modulation - QPSK];
fd607212 MCC	156	val \|= p->hierarchy - HIERARCHY_NONE;
1da177e4 LT	157
	158	cx22700_writereg (state, 0x04, val);
	159
667c952e MCC	160	if (p->code_rate_HP - FEC_1_2 >= sizeof(fec_tab) \|\|
	161	p->code_rate_LP - FEC_1_2 >= sizeof(fec_tab))
	162	return -EINVAL;
1da177e4 LT	163	val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
	164	val \|= fec_tab[p->code_rate_LP - FEC_1_2];
	165
	166	cx22700_writereg (state, 0x05, val);
	167
	168	val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
	169	val \|= p->transmission_mode - TRANSMISSION_MODE_2K;
	170
	171	cx22700_writereg (state, 0x06, val);
	172
	173	cx22700_writereg (state, 0x08, 0x04 \| 0x02); /* use user tps parameters */
25985edc	174	cx22700_writereg (state, 0x08, 0x04); /* restart acquisition */
1da177e4 LT	175
	176	return 0;
	177	}
	178
fd607212 MCC	179	static int cx22700_get_tps(struct cx22700_state *state,
fd607212 MCC	180	struct dtv_frontend_properties *p)
1da177e4	181	{
0df289a2 MCC	182	static const enum fe_modulation qam_tab[3] = { QPSK, QAM_16, QAM_64 };
	183	static const enum fe_code_rate fec_tab[5] = {
	184	FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8
	185	};
1da177e4 LT	186	u8 val;
1da177e4 LT	187
271ddbf7	188	dprintk ("%s\n", __func__);
1da177e4 LT	189
	190	if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */
	191	return -EAGAIN;
	192
	193	val = cx22700_readreg (state, 0x01);
	194
	195	if ((val & 0x7) > 4)
fd607212	196	p->hierarchy = HIERARCHY_AUTO;
1da177e4	197	else
fd607212	198	p->hierarchy = HIERARCHY_NONE + (val & 0x7);
1da177e4 LT	199
1da177e4 LT	200	if (((val >> 3) & 0x3) > 2)
fd607212	201	p->modulation = QAM_AUTO;
1da177e4	202	else
fd607212	203	p->modulation = qam_tab[(val >> 3) & 0x3];
1da177e4 LT	204
	205	val = cx22700_readreg (state, 0x02);
	206
	207	if (((val >> 3) & 0x07) > 4)
	208	p->code_rate_HP = FEC_AUTO;
	209	else
	210	p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
	211
	212	if ((val & 0x07) > 4)
	213	p->code_rate_LP = FEC_AUTO;
	214	else
	215	p->code_rate_LP = fec_tab[val & 0x07];
	216
	217	val = cx22700_readreg (state, 0x03);
	218
	219	p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
	220	p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
	221
	222	return 0;
	223	}
	224
	225	static int cx22700_init (struct dvb_frontend* fe)
	226
b8742700	227	{ struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	228	int i;
	229
	230	dprintk("cx22700_init: init chip\n");
	231
	232	cx22700_writereg (state, 0x00, 0x02); /* soft reset */
	233	cx22700_writereg (state, 0x00, 0x00);
	234
	235	msleep(10);
	236
	237	for (i=0; i<sizeof(init_tab); i+=2)
	238	cx22700_writereg (state, init_tab[i], init_tab[i+1]);
	239
	240	cx22700_writereg (state, 0x00, 0x01);
	241
1da177e4 LT	242	return 0;
	243	}
	244
0df289a2	245	static int cx22700_read_status(struct dvb_frontend fe, enum fe_status status)
1da177e4	246	{
b8742700	247	struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	248
	249	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
	250	\| (cx22700_readreg (state, 0x0e) << 1);
	251	u8 sync = cx22700_readreg (state, 0x07);
	252
	253	*status = 0;
	254
	255	if (rs_ber < 0xff00)
	256	*status \|= FE_HAS_SIGNAL;
	257
	258	if (sync & 0x20)
	259	*status \|= FE_HAS_CARRIER;
	260
	261	if (sync & 0x10)
	262	*status \|= FE_HAS_VITERBI;
	263
	264	if (sync & 0x10)
	265	*status \|= FE_HAS_SYNC;
	266
	267	if (*status == 0x0f)
	268	*status \|= FE_HAS_LOCK;
	269
	270	return 0;
	271	}
	272
	273	static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
	274	{
b8742700	275	struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	276
	277	*ber = cx22700_readreg (state, 0x0c) & 0x7f;
	278	cx22700_writereg (state, 0x0c, 0x00);
	279
	280	return 0;
	281	}
	282
	283	static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
	284	{
b8742700	285	struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	286
	287	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
	288	\| (cx22700_readreg (state, 0x0e) << 1);
	289	*signal_strength = ~rs_ber;
	290
	291	return 0;
	292	}
	293
	294	static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
	295	{
b8742700	296	struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	297
	298	u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
	299	\| (cx22700_readreg (state, 0x0e) << 1);
	300	*snr = ~rs_ber;
	301
	302	return 0;
	303	}
	304
	305	static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
	306	{
b8742700	307	struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	308
	309	*ucblocks = cx22700_readreg (state, 0x0f);
	310	cx22700_writereg (state, 0x0f, 0x00);
	311
	312	return 0;
	313	}
	314
fd607212	315	static int cx22700_set_frontend(struct dvb_frontend *fe)
1da177e4	316	{
fd607212	317	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
b8742700	318	struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	319
	320	cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
	321	cx22700_writereg (state, 0x00, 0x00);
	322
dea74869	323	if (fe->ops.tuner_ops.set_params) {
14d24d14	324	fe->ops.tuner_ops.set_params(fe);
dea74869	325	if (fe->ops.i2c_gate_ctrl) fe->ops.i2c_gate_ctrl(fe, 0);
5becb3b0 AQ	326	}
5becb3b0 AQ	327
fd607212 MCC	328	cx22700_set_inversion(state, c->inversion);
fd607212 MCC	329	cx22700_set_tps(state, c);
1da177e4 LT	330	cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */
	331	cx22700_writereg (state, 0x00, 0x01); /* restart acquire */
	332
	333	return 0;
	334	}
	335
7e3e68bc MCC	336	static int cx22700_get_frontend(struct dvb_frontend *fe,
7e3e68bc MCC	337	struct dtv_frontend_properties *c)
1da177e4	338	{
b8742700	339	struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	340	u8 reg09 = cx22700_readreg (state, 0x09);
1da177e4 LT	341
fd607212 MCC	342	c->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
fd607212 MCC	343	return cx22700_get_tps(state, c);
1da177e4 LT	344	}
1da177e4 LT	345
5becb3b0 AQ	346	static int cx22700_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
	347	{
	348	struct cx22700_state* state = fe->demodulator_priv;
	349
	350	if (enable) {
	351	return cx22700_writereg(state, 0x0a, 0x00);
	352	} else {
	353	return cx22700_writereg(state, 0x0a, 0x01);
	354	}
	355	}
	356
1da177e4 LT	357	static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
1da177e4 LT	358	{
9101e622 MCC	359	fesettings->min_delay_ms = 150;
	360	fesettings->step_size = 166667;
	361	fesettings->max_drift = 166667*2;
	362	return 0;
1da177e4 LT	363	}
	364
	365	static void cx22700_release(struct dvb_frontend* fe)
	366	{
b8742700	367	struct cx22700_state* state = fe->demodulator_priv;
1da177e4 LT	368	kfree(state);
	369	}
	370
bd336e63	371	static const struct dvb_frontend_ops cx22700_ops;
1da177e4 LT	372
	373	struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
	374	struct i2c_adapter* i2c)
	375	{
	376	struct cx22700_state* state = NULL;
	377
	378	/* allocate memory for the internal state */
084e24ac	379	state = kzalloc(sizeof(struct cx22700_state), GFP_KERNEL);
1da177e4 LT	380	if (state == NULL) goto error;
	381
	382	/* setup the state */
	383	state->config = config;
	384	state->i2c = i2c;
1da177e4 LT	385
	386	/* check if the demod is there */
	387	if (cx22700_readreg(state, 0x07) < 0) goto error;
	388
	389	/* create dvb_frontend */
dea74869	390	memcpy(&state->frontend.ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
1da177e4 LT	391	state->frontend.demodulator_priv = state;
	392	return &state->frontend;
	393
	394	error:
	395	kfree(state);
	396	return NULL;
	397	}
	398
bd336e63	399	static const struct dvb_frontend_ops cx22700_ops = {
fd607212	400	.delsys = { SYS_DVBT },
1da177e4 LT	401	.info = {
1da177e4 LT	402	.name = "Conexant CX22700 DVB-T",
f1b1eabf MCC	403	.frequency_min_hz = 470 * MHz,
	404	.frequency_max_hz = 860 * MHz,
	405	.frequency_stepsize_hz = 166667,
1da177e4 LT	406	.caps = FE_CAN_FEC_1_2 \| FE_CAN_FEC_2_3 \| FE_CAN_FEC_3_4 \|
	407	FE_CAN_FEC_5_6 \| FE_CAN_FEC_7_8 \| FE_CAN_FEC_AUTO \|
	408	FE_CAN_QPSK \| FE_CAN_QAM_16 \| FE_CAN_QAM_64 \|
9101e622	409	FE_CAN_RECOVER
1da177e4 LT	410	},
	411
	412	.release = cx22700_release,
	413
	414	.init = cx22700_init,
5becb3b0	415	.i2c_gate_ctrl = cx22700_i2c_gate_ctrl,
1da177e4	416
fd607212 MCC	417	.set_frontend = cx22700_set_frontend,
fd607212 MCC	418	.get_frontend = cx22700_get_frontend,
1da177e4 LT	419	.get_tune_settings = cx22700_get_tune_settings,
	420
	421	.read_status = cx22700_read_status,
	422	.read_ber = cx22700_read_ber,
	423	.read_signal_strength = cx22700_read_signal_strength,
	424	.read_snr = cx22700_read_snr,
	425	.read_ucblocks = cx22700_read_ucblocks,
	426	};
	427
	428	module_param(debug, int, 0644);
	429	MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
	430
	431	MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
	432	MODULE_AUTHOR("Holger Waechtler");
	433	MODULE_LICENSE("GPL");
	434
	435	EXPORT_SYMBOL(cx22700_attach);