[linux-2.6-block.git] / drivers / media / dvb-frontends / ts2020.c

/*
    Montage Technology TS2020 - Silicon Tuner driver
    Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>

    Copyright (C) 2009-2012 TurboSight.com

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "dvb_frontend.h"
#include "ts2020.h"

#define TS2020_XTAL_FREQ   27000 /* in kHz */

struct ts2020_state {
	u8 tuner_address;
	struct i2c_adapter *i2c;
};

static int ts2020_readreg(struct dvb_frontend *fe, u8 reg)
{
	struct ts2020_state *state = fe->tuner_priv;

	int ret;
	u8 b0[] = { reg };
	u8 b1[] = { 0 };
	struct i2c_msg msg[] = {
		{
			.addr = state->tuner_address,
			.flags = 0,
			.buf = b0,
			.len = 1
		}, {
			.addr = state->tuner_address,
			.flags = I2C_M_RD,
			.buf = b1,
			.len = 1
		}
	};

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

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

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	if (ret != 2) {
		printk(KERN_ERR "%s: reg=0x%x(error=%d)\n", __func__, reg, ret);
		return ret;
	}

	return b1[0];
}

static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data)
{
	struct ts2020_state *state = fe->tuner_priv;

	u8 buf[] = { reg, data };
	struct i2c_msg msg = { .addr = state->tuner_address,
		.flags = 0, .buf = buf, .len = 2 };
	int err;


	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

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

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	if (err != 1) {
		printk(KERN_ERR "%s: writereg error(err == %i, reg == 0x%02x,"
			 " value == 0x%02x)\n", __func__, err, reg, data);
		return -EREMOTEIO;
	}

	return 0;
}

static int ts2020_init(struct dvb_frontend *fe)
{
	ts2020_writereg(fe, 0x42, 0x73);
	ts2020_writereg(fe, 0x05, 0x01);
	ts2020_writereg(fe, 0x62, 0xf5);
	return 0;
}

static int ts2020_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	u16 ndiv, div4;

	div4 = (ts2020_readreg(fe, 0x10) & 0x10) >> 4;

	ndiv = ts2020_readreg(fe, 0x01);
	ndiv &= 0x0f;
	ndiv <<= 8;
	ndiv |= ts2020_readreg(fe, 0x02);

	/* actual tuned frequency, i.e. including the offset */
	*frequency = (ndiv - ndiv % 2 + 1024) * TS2020_XTAL_FREQ
		/ (6 + 8) / (div4 + 1) / 2;

	return 0;
}

static int ts2020_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;

	u8 mlpf, mlpf_new, mlpf_max, mlpf_min, nlpf;
	u16 value, ndiv;
	u32 srate = 0, f3db;

	ts2020_init(fe);

	/* unknown */
	ts2020_writereg(fe, 0x07, 0x02);
	ts2020_writereg(fe, 0x10, 0x00);
	ts2020_writereg(fe, 0x60, 0x79);
	ts2020_writereg(fe, 0x08, 0x01);
	ts2020_writereg(fe, 0x00, 0x01);

	/* calculate and set freq divider */
	if (c->frequency < 1146000) {
		ts2020_writereg(fe, 0x10, 0x11);
		ndiv = ((c->frequency * (6 + 8) * 4) +
				(TS2020_XTAL_FREQ / 2)) /
				TS2020_XTAL_FREQ - 1024;
	} else {
		ts2020_writereg(fe, 0x10, 0x01);
		ndiv = ((c->frequency * (6 + 8) * 2) +
				(TS2020_XTAL_FREQ / 2)) /
				TS2020_XTAL_FREQ - 1024;
	}

	ts2020_writereg(fe, 0x01, (ndiv & 0x0f00) >> 8);
	ts2020_writereg(fe, 0x02, ndiv & 0x00ff);

	/* set pll */
	ts2020_writereg(fe, 0x03, 0x06);
	ts2020_writereg(fe, 0x51, 0x0f);
	ts2020_writereg(fe, 0x51, 0x1f);
	ts2020_writereg(fe, 0x50, 0x10);
	ts2020_writereg(fe, 0x50, 0x00);
	msleep(5);

	/* unknown */
	ts2020_writereg(fe, 0x51, 0x17);
	ts2020_writereg(fe, 0x51, 0x1f);
	ts2020_writereg(fe, 0x50, 0x08);
	ts2020_writereg(fe, 0x50, 0x00);
	msleep(5);

	value = ts2020_readreg(fe, 0x3d);
	value &= 0x0f;
	if ((value > 4) && (value < 15)) {
		value -= 3;
		if (value < 4)
			value = 4;
		value = ((value << 3) | 0x01) & 0x79;
	}

	ts2020_writereg(fe, 0x60, value);
	ts2020_writereg(fe, 0x51, 0x17);
	ts2020_writereg(fe, 0x51, 0x1f);
	ts2020_writereg(fe, 0x50, 0x08);
	ts2020_writereg(fe, 0x50, 0x00);

	/* set low-pass filter period */
	ts2020_writereg(fe, 0x04, 0x2e);
	ts2020_writereg(fe, 0x51, 0x1b);
	ts2020_writereg(fe, 0x51, 0x1f);
	ts2020_writereg(fe, 0x50, 0x04);
	ts2020_writereg(fe, 0x50, 0x00);
	msleep(5);

	srate = c->symbol_rate / 1000;

	f3db = (srate << 2) / 5 + 2000;
	if (srate < 5000)
		f3db += 3000;
	if (f3db < 7000)
		f3db = 7000;
	if (f3db > 40000)
		f3db = 40000;

	/* set low-pass filter baseband */
	value = ts2020_readreg(fe, 0x26);
	mlpf = 0x2e * 207 / ((value << 1) + 151);
	mlpf_max = mlpf * 135 / 100;
	mlpf_min = mlpf * 78 / 100;
	if (mlpf_max > 63)
		mlpf_max = 63;

	/* rounded to the closest integer */
	nlpf = ((mlpf * f3db * 1000) + (2766 * TS2020_XTAL_FREQ / 2))
			/ (2766 * TS2020_XTAL_FREQ);
	if (nlpf > 23)
		nlpf = 23;
	if (nlpf < 1)
		nlpf = 1;

	/* rounded to the closest integer */
	mlpf_new = ((TS2020_XTAL_FREQ * nlpf * 2766) +
			(1000 * f3db / 2)) / (1000 * f3db);

	if (mlpf_new < mlpf_min) {
		nlpf++;
		mlpf_new = ((TS2020_XTAL_FREQ * nlpf * 2766) +
				(1000 * f3db / 2)) / (1000 * f3db);
	}

	if (mlpf_new > mlpf_max)
		mlpf_new = mlpf_max;

	ts2020_writereg(fe, 0x04, mlpf_new);
	ts2020_writereg(fe, 0x06, nlpf);
	ts2020_writereg(fe, 0x51, 0x1b);
	ts2020_writereg(fe, 0x51, 0x1f);
	ts2020_writereg(fe, 0x50, 0x04);
	ts2020_writereg(fe, 0x50, 0x00);
	msleep(5);

	/* unknown */
	ts2020_writereg(fe, 0x51, 0x1e);
	ts2020_writereg(fe, 0x51, 0x1f);
	ts2020_writereg(fe, 0x50, 0x01);
	ts2020_writereg(fe, 0x50, 0x00);
	msleep(60);

	return 0;
}

static int ts2020_release(struct dvb_frontend *fe)
{
	struct ts2020_state *state = fe->tuner_priv;

	fe->tuner_priv = NULL;
	kfree(state);

	return 0;
}

static int ts2020_get_signal_strength(struct dvb_frontend *fe,
	u16 *signal_strength)
{
	u16 sig_reading, sig_strength;
	u8 rfgain, bbgain;

	rfgain = ts2020_readreg(fe, 0x3d) & 0x1f;
	bbgain = ts2020_readreg(fe, 0x21) & 0x1f;

	if (rfgain > 15)
		rfgain = 15;
	if (bbgain > 13)
		bbgain = 13;

	sig_reading = rfgain * 2 + bbgain * 3;

	sig_strength = 40 + (64 - sig_reading) * 50 / 64 ;

	/* cook the value to be suitable for szap-s2 human readable output */
	*signal_strength = sig_strength * 1000;

	return 0;
}

static struct dvb_tuner_ops ts2020_ops = {
	.info = {
		.name = "Montage Technology TS2020 Silicon Tuner",
		.frequency_min = 950000,
		.frequency_max = 2150000,
	},

	.init = ts2020_init,
	.release = ts2020_release,
	.set_params = ts2020_set_params,
	.get_frequency = ts2020_get_frequency,
	.get_rf_strength = ts2020_get_signal_strength
};

struct dvb_frontend *ts2020_attach(struct dvb_frontend *fe,
	const struct ts2020_config *config, struct i2c_adapter *i2c)
{
	struct ts2020_state *state = NULL;

	/* allocate memory for the internal state */
	state = kzalloc(sizeof(struct ts2020_state), GFP_KERNEL);
	if (!state)
		return NULL;

	/* setup the state */
	state->tuner_address = config->tuner_address;
	state->i2c = i2c;
	fe->tuner_priv = state;
	fe->ops.tuner_ops = ts2020_ops;
	fe->ops.read_signal_strength = fe->ops.tuner_ops.get_rf_strength;

	return fe;
}
EXPORT_SYMBOL(ts2020_attach);

MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
MODULE_LICENSE("GPL");
Commit	Line	Data
6fef4fc7 KD	1	/*
	2	Montage Technology TS2020 - Silicon Tuner driver
	3	Copyright (C) 2009-2012 Konstantin Dimitrov <kosio.dimitrov@gmail.com>
	4
	5	Copyright (C) 2009-2012 TurboSight.com
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 2 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22	#include "dvb_frontend.h"
	23	#include "ts2020.h"
	24
	25	#define TS2020_XTAL_FREQ 27000 /* in kHz */
	26
	27	struct ts2020_state {
	28	u8 tuner_address;
	29	struct i2c_adapter *i2c;
	30	};
	31
	32	static int ts2020_readreg(struct dvb_frontend *fe, u8 reg)
	33	{
	34	struct ts2020_state *state = fe->tuner_priv;
	35
	36	int ret;
	37	u8 b0[] = { reg };
	38	u8 b1[] = { 0 };
	39	struct i2c_msg msg[] = {
	40	{
	41	.addr = state->tuner_address,
	42	.flags = 0,
	43	.buf = b0,
	44	.len = 1
	45	}, {
	46	.addr = state->tuner_address,
	47	.flags = I2C_M_RD,
	48	.buf = b1,
	49	.len = 1
	50	}
	51	};
	52
	53	if (fe->ops.i2c_gate_ctrl)
	54	fe->ops.i2c_gate_ctrl(fe, 1);
	55
	56	ret = i2c_transfer(state->i2c, msg, 2);
	57
	58	if (fe->ops.i2c_gate_ctrl)
	59	fe->ops.i2c_gate_ctrl(fe, 0);
	60
	61	if (ret != 2) {
	62	printk(KERN_ERR "%s: reg=0x%x(error=%d)\n", __func__, reg, ret);
	63	return ret;
	64	}
65
66	return b1[0];
67	}
68
69	static int ts2020_writereg(struct dvb_frontend *fe, int reg, int data)
70	{
71	struct ts2020_state *state = fe->tuner_priv;
72
73	u8 buf[] = { reg, data };
74	struct i2c_msg msg = { .addr = state->tuner_address,
75	.flags = 0, .buf = buf, .len = 2 };
76	int err;
77
78
79	if (fe->ops.i2c_gate_ctrl)
80	fe->ops.i2c_gate_ctrl(fe, 1);
81
82	err = i2c_transfer(state->i2c, &msg, 1);
83
84	if (fe->ops.i2c_gate_ctrl)
85	fe->ops.i2c_gate_ctrl(fe, 0);
86
87	if (err != 1) {
88	printk(KERN_ERR "%s: writereg error(err == %i, reg == 0x%02x,"
89	" value == 0x%02x)\n", __func__, err, reg, data);
90	return -EREMOTEIO;
91	}
92
93	return 0;
94	}
95
96	static int ts2020_init(struct dvb_frontend *fe)
97	{
98	ts2020_writereg(fe, 0x42, 0x73);
99	ts2020_writereg(fe, 0x05, 0x01);
100	ts2020_writereg(fe, 0x62, 0xf5);
101	return 0;
102	}
103
104	static int ts2020_get_frequency(struct dvb_frontend fe, u32 frequency)
105	{
106	u16 ndiv, div4;
107
108	div4 = (ts2020_readreg(fe, 0x10) & 0x10) >> 4;
109
110	ndiv = ts2020_readreg(fe, 0x01);
111	ndiv &= 0x0f;
112	ndiv <<= 8;
113	ndiv \|= ts2020_readreg(fe, 0x02);
114
115	/* actual tuned frequency, i.e. including the offset */
116	frequency = (ndiv - ndiv % 2 + 1024) TS2020_XTAL_FREQ
117	/ (6 + 8) / (div4 + 1) / 2;
118
119	return 0;
120	}
121
122	static int ts2020_set_params(struct dvb_frontend *fe)
123	{
124	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
125
f8c30b6f	126	u8 mlpf, mlpf_new, mlpf_max, mlpf_min, nlpf;
6fef4fc7 KD	127	u16 value, ndiv;
	128	u32 srate = 0, f3db;
	129
	130	ts2020_init(fe);
	131
	132	/* unknown */
	133	ts2020_writereg(fe, 0x07, 0x02);
	134	ts2020_writereg(fe, 0x10, 0x00);
	135	ts2020_writereg(fe, 0x60, 0x79);
	136	ts2020_writereg(fe, 0x08, 0x01);
	137	ts2020_writereg(fe, 0x00, 0x01);
6fef4fc7 KD	138
	139	/* calculate and set freq divider */
	140	if (c->frequency < 1146000) {
	141	ts2020_writereg(fe, 0x10, 0x11);
6fef4fc7 KD	142	ndiv = ((c->frequency * (6 + 8) * 4) +
	143	(TS2020_XTAL_FREQ / 2)) /
	144	TS2020_XTAL_FREQ - 1024;
	145	} else {
	146	ts2020_writereg(fe, 0x10, 0x01);
	147	ndiv = ((c->frequency * (6 + 8) * 2) +
	148	(TS2020_XTAL_FREQ / 2)) /
	149	TS2020_XTAL_FREQ - 1024;
	150	}
	151
	152	ts2020_writereg(fe, 0x01, (ndiv & 0x0f00) >> 8);
	153	ts2020_writereg(fe, 0x02, ndiv & 0x00ff);
	154
	155	/* set pll */
	156	ts2020_writereg(fe, 0x03, 0x06);
	157	ts2020_writereg(fe, 0x51, 0x0f);
	158	ts2020_writereg(fe, 0x51, 0x1f);
	159	ts2020_writereg(fe, 0x50, 0x10);
	160	ts2020_writereg(fe, 0x50, 0x00);
	161	msleep(5);
	162
	163	/* unknown */
	164	ts2020_writereg(fe, 0x51, 0x17);
	165	ts2020_writereg(fe, 0x51, 0x1f);
	166	ts2020_writereg(fe, 0x50, 0x08);
	167	ts2020_writereg(fe, 0x50, 0x00);
	168	msleep(5);
	169
	170	value = ts2020_readreg(fe, 0x3d);
	171	value &= 0x0f;
	172	if ((value > 4) && (value < 15)) {
	173	value -= 3;
	174	if (value < 4)
	175	value = 4;
	176	value = ((value << 3) \| 0x01) & 0x79;
	177	}
	178
	179	ts2020_writereg(fe, 0x60, value);
	180	ts2020_writereg(fe, 0x51, 0x17);
	181	ts2020_writereg(fe, 0x51, 0x1f);
	182	ts2020_writereg(fe, 0x50, 0x08);
	183	ts2020_writereg(fe, 0x50, 0x00);
	184
	185	/* set low-pass filter period */
	186	ts2020_writereg(fe, 0x04, 0x2e);
	187	ts2020_writereg(fe, 0x51, 0x1b);
	188	ts2020_writereg(fe, 0x51, 0x1f);
	189	ts2020_writereg(fe, 0x50, 0x04);
	190	ts2020_writereg(fe, 0x50, 0x00);
	191	msleep(5);
	192
	193	srate = c->symbol_rate / 1000;
	194
	195	f3db = (srate << 2) / 5 + 2000;
	196	if (srate < 5000)
	197	f3db += 3000;
	198	if (f3db < 7000)
	199	f3db = 7000;
	200	if (f3db > 40000)
	201	f3db = 40000;
	202
	203	/* set low-pass filter baseband */
	204	value = ts2020_readreg(fe, 0x26);
	205	mlpf = 0x2e * 207 / ((value << 1) + 151);
206	mlpf_max = mlpf * 135 / 100;
207	mlpf_min = mlpf * 78 / 100;
208	if (mlpf_max > 63)
209	mlpf_max = 63;
210
211	/* rounded to the closest integer */
212	nlpf = ((mlpf * f3db * 1000) + (2766 * TS2020_XTAL_FREQ / 2))
213	/ (2766 * TS2020_XTAL_FREQ);
214	if (nlpf > 23)
215	nlpf = 23;
216	if (nlpf < 1)
217	nlpf = 1;
218
219	/* rounded to the closest integer */
220	mlpf_new = ((TS2020_XTAL_FREQ * nlpf * 2766) +
221	(1000 * f3db / 2)) / (1000 * f3db);
222
223	if (mlpf_new < mlpf_min) {
224	nlpf++;
225	mlpf_new = ((TS2020_XTAL_FREQ * nlpf * 2766) +
226	(1000 * f3db / 2)) / (1000 * f3db);
227	}
228
229	if (mlpf_new > mlpf_max)
230	mlpf_new = mlpf_max;
231
232	ts2020_writereg(fe, 0x04, mlpf_new);
233	ts2020_writereg(fe, 0x06, nlpf);
234	ts2020_writereg(fe, 0x51, 0x1b);
235	ts2020_writereg(fe, 0x51, 0x1f);
236	ts2020_writereg(fe, 0x50, 0x04);
237	ts2020_writereg(fe, 0x50, 0x00);
238	msleep(5);
239
240	/* unknown */
241	ts2020_writereg(fe, 0x51, 0x1e);
242	ts2020_writereg(fe, 0x51, 0x1f);
243	ts2020_writereg(fe, 0x50, 0x01);
244	ts2020_writereg(fe, 0x50, 0x00);
245	msleep(60);
246
247	return 0;
248	}
249
250	static int ts2020_release(struct dvb_frontend *fe)
251	{
252	struct ts2020_state *state = fe->tuner_priv;
253
254	fe->tuner_priv = NULL;
255	kfree(state);
256
257	return 0;
258	}
259
f8c30b6f	260	static int ts2020_get_signal_strength(struct dvb_frontend *fe,
6fef4fc7 KD	261	u16 *signal_strength)
	262	{
	263	u16 sig_reading, sig_strength;
	264	u8 rfgain, bbgain;
	265
	266	rfgain = ts2020_readreg(fe, 0x3d) & 0x1f;
	267	bbgain = ts2020_readreg(fe, 0x21) & 0x1f;
	268
	269	if (rfgain > 15)
	270	rfgain = 15;
	271	if (bbgain > 13)
	272	bbgain = 13;
	273
	274	sig_reading = rfgain * 2 + bbgain * 3;
	275
	276	sig_strength = 40 + (64 - sig_reading) * 50 / 64 ;
	277
	278	/* cook the value to be suitable for szap-s2 human readable output */
	279	signal_strength = sig_strength 1000;
	280
	281	return 0;
	282	}
	283
	284	static struct dvb_tuner_ops ts2020_ops = {
	285	.info = {
	286	.name = "Montage Technology TS2020 Silicon Tuner",
	287	.frequency_min = 950000,
	288	.frequency_max = 2150000,
	289	},
	290
	291	.init = ts2020_init,
	292	.release = ts2020_release,
	293	.set_params = ts2020_set_params,
	294	.get_frequency = ts2020_get_frequency,
	295	.get_rf_strength = ts2020_get_signal_strength
	296	};
	297
	298	struct dvb_frontend ts2020_attach(struct dvb_frontend fe,
	299	const struct ts2020_config config, struct i2c_adapter i2c)
	300	{
	301	struct ts2020_state *state = NULL;
	302
	303	/* allocate memory for the internal state */
	304	state = kzalloc(sizeof(struct ts2020_state), GFP_KERNEL);
	305	if (!state)
	306	return NULL;
	307
	308	/* setup the state */
	309	state->tuner_address = config->tuner_address;
	310	state->i2c = i2c;
	311	fe->tuner_priv = state;
	312	fe->ops.tuner_ops = ts2020_ops;
	313	fe->ops.read_signal_strength = fe->ops.tuner_ops.get_rf_strength;
	314
	315	return fe;
	316	}
	317	EXPORT_SYMBOL(ts2020_attach);
	318
	319	MODULE_AUTHOR("Konstantin Dimitrov <kosio.dimitrov@gmail.com>");
	320	MODULE_DESCRIPTION("Montage Technology TS2020 - Silicon tuner driver module");
	321	MODULE_LICENSE("GPL");