[linux-2.6-block.git] / drivers / media / dvb-frontends / tda826x.c

// SPDX-License-Identifier: GPL-2.0-or-later
  /*
     Driver for Philips tda8262/tda8263 DVBS Silicon tuners

     (c) 2006 Andrew de Quincey


  */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/dvb/frontend.h>
#include <asm/types.h>

#include "tda826x.h"

static int debug;
#define dprintk(args...) \
	do { \
		if (debug) printk(KERN_DEBUG "tda826x: " args); \
	} while (0)

struct tda826x_priv {
	/* i2c details */
	int i2c_address;
	struct i2c_adapter *i2c;
	u8 has_loopthrough:1;
	u32 frequency;
};

static void tda826x_release(struct dvb_frontend *fe)
{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
}

static int tda826x_sleep(struct dvb_frontend *fe)
{
	struct tda826x_priv *priv = fe->tuner_priv;
	int ret;
	u8 buf [] = { 0x00, 0x8d };
	struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 };

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

	if (!priv->has_loopthrough)
		buf[1] = 0xad;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
		dprintk("%s: i2c error\n", __func__);
	}
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

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

static int tda826x_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct tda826x_priv *priv = fe->tuner_priv;
	int ret;
	u32 div;
	u32 ksyms;
	u32 bandwidth;
	u8 buf [11];
	struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 };

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

	div = (p->frequency + (1000-1)) / 1000;

	/* BW = ((1 + RO) * SR/2 + 5) * 1.3      [SR in MSPS, BW in MHz] */
	/* with R0 = 0.35 and some transformations: */
	ksyms = p->symbol_rate / 1000;
	bandwidth = (878 * ksyms + 6500000) / 1000000 + 1;
	if (bandwidth < 5)
		bandwidth = 5;
	else if (bandwidth > 36)
		bandwidth = 36;

	buf[0] = 0x00; // subaddress
	buf[1] = 0x09; // powerdown RSSI + the magic value 1
	if (!priv->has_loopthrough)
		buf[1] |= 0x20; // power down loopthrough if not needed
	buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO
	buf[3] = div >> 7;
	buf[4] = div << 1;
	buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */
	buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation
	buf[7] = 0x83; // charge pumps at high, tests off
	buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.
	buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL
	buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
		dprintk("%s: i2c error\n", __func__);
	}
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	priv->frequency = div * 1000;

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

static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct tda826x_priv *priv = fe->tuner_priv;
	*frequency = priv->frequency;
	return 0;
}

static const struct dvb_tuner_ops tda826x_tuner_ops = {
	.info = {
		.name = "Philips TDA826X",
		.frequency_min_hz =  950 * MHz,
		.frequency_max_hz = 2175 * MHz
	},
	.release = tda826x_release,
	.sleep = tda826x_sleep,
	.set_params = tda826x_set_params,
	.get_frequency = tda826x_get_frequency,
};

struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough)
{
	struct tda826x_priv *priv = NULL;
	u8 b1 [] = { 0, 0 };
	struct i2c_msg msg[2] = {
		{ .addr = addr, .flags = 0,        .buf = NULL, .len = 0 },
		{ .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 }
	};
	int ret;

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

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	ret = i2c_transfer (i2c, msg, 2);
	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	if (ret != 2)
		return NULL;
	if (!(b1[1] & 0x80))
		return NULL;

	priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL);
	if (priv == NULL)
		return NULL;

	priv->i2c_address = addr;
	priv->i2c = i2c;
	priv->has_loopthrough = has_loopthrough;

	memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops));

	fe->tuner_priv = priv;

	return fe;
}
EXPORT_SYMBOL(tda826x_attach);

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

MODULE_DESCRIPTION("DVB TDA826x driver");
MODULE_AUTHOR("Andrew de Quincey");
MODULE_LICENSE("GPL");
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
6bca3580 AQ	2	/*
	3	Driver for Philips tda8262/tda8263 DVBS Silicon tuners
	4
	5	(c) 2006 Andrew de Quincey
	6
6bca3580 AQ	7
	8	*/
	9
5a0e3ad6	10	#include <linux/slab.h>
6bca3580 AQ	11	#include <linux/module.h>
	12	#include <linux/dvb/frontend.h>
	13	#include <asm/types.h>
	14
	15	#include "tda826x.h"
	16
ff699e6b	17	static int debug;
8b9a4664 AQ	18	#define dprintk(args...) \
	19	do { \
	20	if (debug) printk(KERN_DEBUG "tda826x: " args); \
	21	} while (0)
	22
6bca3580 AQ	23	struct tda826x_priv {
	24	/* i2c details */
	25	int i2c_address;
	26	struct i2c_adapter *i2c;
	27	u8 has_loopthrough:1;
	28	u32 frequency;
	29	};
	30
f2709c20 MCC	31	static void tda826x_release(struct dvb_frontend *fe)
	32	{
	33	kfree(fe->tuner_priv);
	34	fe->tuner_priv = NULL;
	35	}
	36
6bca3580 AQ	37	static int tda826x_sleep(struct dvb_frontend *fe)
	38	{
	39	struct tda826x_priv *priv = fe->tuner_priv;
	40	int ret;
	41	u8 buf [] = { 0x00, 0x8d };
	42	struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 };
	43
271ddbf7	44	dprintk("%s:\n", __func__);
8b9a4664	45
6bca3580 AQ	46	if (!priv->has_loopthrough)
	47	buf[1] = 0xad;
	48
	49	if (fe->ops.i2c_gate_ctrl)
	50	fe->ops.i2c_gate_ctrl(fe, 1);
	51	if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
271ddbf7	52	dprintk("%s: i2c error\n", __func__);
6bca3580 AQ	53	}
	54	if (fe->ops.i2c_gate_ctrl)
	55	fe->ops.i2c_gate_ctrl(fe, 0);
6bca3580 AQ	56
	57	return (ret == 1) ? 0 : ret;
	58	}
	59
14d24d14	60	static int tda826x_set_params(struct dvb_frontend *fe)
6bca3580	61	{
66e6cd59	62	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
6bca3580 AQ	63	struct tda826x_priv *priv = fe->tuner_priv;
	64	int ret;
	65	u32 div;
3ff9a81b HH	66	u32 ksyms;
3ff9a81b HH	67	u32 bandwidth;
6bca3580 AQ	68	u8 buf [11];
	69	struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 };
	70
271ddbf7	71	dprintk("%s:\n", __func__);
8b9a4664	72
66e6cd59	73	div = (p->frequency + (1000-1)) / 1000;
6bca3580	74
3ff9a81b HH	75	/* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */
3ff9a81b HH	76	/* with R0 = 0.35 and some transformations: */
66e6cd59	77	ksyms = p->symbol_rate / 1000;
3ff9a81b HH	78	bandwidth = (878 * ksyms + 6500000) / 1000000 + 1;
	79	if (bandwidth < 5)
	80	bandwidth = 5;
	81	else if (bandwidth > 36)
	82	bandwidth = 36;
	83
6bca3580 AQ	84	buf[0] = 0x00; // subaddress
	85	buf[1] = 0x09; // powerdown RSSI + the magic value 1
	86	if (!priv->has_loopthrough)
	87	buf[1] \|= 0x20; // power down loopthrough if not needed
	88	buf[2] = (1<<5) \| 0x0b; // 1Mhz + 0.45 VCO
	89	buf[3] = div >> 7;
	90	buf[4] = div << 1;
3ff9a81b	91	buf[5] = ((bandwidth - 5) << 3) \| 7; /* baseband cut-off */
c6604150	92	buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation
6bca3580 AQ	93	buf[7] = 0x83; // charge pumps at high, tests off
	94	buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.
	95	buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL
	96	buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on
	97
	98	if (fe->ops.i2c_gate_ctrl)
	99	fe->ops.i2c_gate_ctrl(fe, 1);
	100	if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
271ddbf7	101	dprintk("%s: i2c error\n", __func__);
6bca3580 AQ	102	}
	103	if (fe->ops.i2c_gate_ctrl)
	104	fe->ops.i2c_gate_ctrl(fe, 0);
	105
	106	priv->frequency = div * 1000;
6bca3580 AQ	107
	108	return (ret == 1) ? 0 : ret;
	109	}
	110
	111	static int tda826x_get_frequency(struct dvb_frontend fe, u32 frequency)
	112	{
	113	struct tda826x_priv *priv = fe->tuner_priv;
	114	*frequency = priv->frequency;
	115	return 0;
	116	}
	117
14c4bf3c	118	static const struct dvb_tuner_ops tda826x_tuner_ops = {
ef09c071 TP	119	.info = {
ef09c071 TP	120	.name = "Philips TDA826X",
a3f90c75 MCC	121	.frequency_min_hz = 950 * MHz,
a3f90c75 MCC	122	.frequency_max_hz = 2175 * MHz
ef09c071	123	},
f2709c20	124	.release = tda826x_release,
6bca3580 AQ	125	.sleep = tda826x_sleep,
	126	.set_params = tda826x_set_params,
	127	.get_frequency = tda826x_get_frequency,
	128	};
	129
	130	struct dvb_frontend tda826x_attach(struct dvb_frontend fe, int addr, struct i2c_adapter *i2c, int has_loopthrough)
	131	{
	132	struct tda826x_priv *priv = NULL;
	133	u8 b1 [] = { 0, 0 };
8949f1a2 PB	134	struct i2c_msg msg[2] = {
	135	{ .addr = addr, .flags = 0, .buf = NULL, .len = 0 },
	136	{ .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 }
	137	};
6bca3580 AQ	138	int ret;
6bca3580 AQ	139
271ddbf7	140	dprintk("%s:\n", __func__);
8b9a4664	141
6bca3580 AQ	142	if (fe->ops.i2c_gate_ctrl)
6bca3580 AQ	143	fe->ops.i2c_gate_ctrl(fe, 1);
8949f1a2	144	ret = i2c_transfer (i2c, msg, 2);
6bca3580 AQ	145	if (fe->ops.i2c_gate_ctrl)
	146	fe->ops.i2c_gate_ctrl(fe, 0);
	147
8949f1a2	148	if (ret != 2)
6bca3580 AQ	149	return NULL;
	150	if (!(b1[1] & 0x80))
	151	return NULL;
	152
	153	priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL);
	154	if (priv == NULL)
	155	return NULL;
	156
	157	priv->i2c_address = addr;
	158	priv->i2c = i2c;
	159	priv->has_loopthrough = has_loopthrough;
	160
	161	memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops));
6bca3580 AQ	162
6bca3580 AQ	163	fe->tuner_priv = priv;
6bca3580 AQ	164
	165	return fe;
	166	}
	167	EXPORT_SYMBOL(tda826x_attach);
	168
8b9a4664 AQ	169	module_param(debug, int, 0644);
	170	MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
	171
6bca3580 AQ	172	MODULE_DESCRIPTION("DVB TDA826x driver");
	173	MODULE_AUTHOR("Andrew de Quincey");
	174	MODULE_LICENSE("GPL");