tua6100.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Driver for Infineon tua6100 pll.
  4 *
  5 * (c) 2006 Andrew de Quincey
  6 *
  7 * Based on code found in budget-av.c, which has the following:
  8 * Compiled from various sources by Michael Hunold <michael@mihu.de>
  9 *
 10 * CI interface support (c) 2004 Olivier Gournet <ogournet@anevia.com> &
 11 *                               Andrew de Quincey <adq_dvb@lidskialf.net>
 12 *
 13 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
 14 *
 15 * Copyright (C) 1999-2002 Ralph  Metzler
 16 *                       & Marcus Metzler for convergence integrated media GmbH
 17 */
 18
 19#include <linux/slab.h>
 20#include <linux/module.h>
 21#include <linux/dvb/frontend.h>
 22#include <asm/types.h>
 23
 24#include "tua6100.h"
 25
 26struct tua6100_priv {
 27	/* i2c details */
 28	int i2c_address;
 29	struct i2c_adapter *i2c;
 30	u32 frequency;
 31};
 32
 33static void tua6100_release(struct dvb_frontend *fe)
 34{
 35	kfree(fe->tuner_priv);
 36	fe->tuner_priv = NULL;
 37}
 38
 39static int tua6100_sleep(struct dvb_frontend *fe)
 40{
 41	struct tua6100_priv *priv = fe->tuner_priv;
 42	int ret;
 43	u8 reg0[] = { 0x00, 0x00 };
 44	struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
 45
 46	if (fe->ops.i2c_gate_ctrl)
 47		fe->ops.i2c_gate_ctrl(fe, 1);
 48	if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
 49		printk("%s: i2c error\n", __func__);
 50	}
 51	if (fe->ops.i2c_gate_ctrl)
 52		fe->ops.i2c_gate_ctrl(fe, 0);
 53
 54	return (ret == 1) ? 0 : ret;
 55}
 56
 57static int tua6100_set_params(struct dvb_frontend *fe)
 58{
 59	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 60	struct tua6100_priv *priv = fe->tuner_priv;
 61	u32 div;
 62	u32 prediv;
 63	u8 reg0[] = { 0x00, 0x00 };
 64	u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 };
 65	u8 reg2[] = { 0x02, 0x00, 0x00 };
 66	struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
 67	struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 };
 68	struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 };
 69
 70#define _R_VAL 4
 71#define _P_VAL 32
 72#define _ri 4000000
 73
 74	// setup register 0
 75	if (c->frequency < 2000000)
 76		reg0[1] = 0x03;
 77	else
 78		reg0[1] = 0x07;
 79
 80	// setup register 1
 81	if (c->frequency < 1630000)
 82		reg1[1] = 0x2c;
 83	else
 84		reg1[1] = 0x0c;
 85
 86	if (_P_VAL == 64)
 87		reg1[1] |= 0x40;
 88	if (c->frequency >= 1525000)
 89		reg1[1] |= 0x80;
 90
 91	// register 2
 92	reg2[1] = (_R_VAL >> 8) & 0x03;
 93	reg2[2] = _R_VAL;
 94	if (c->frequency < 1455000)
 95		reg2[1] |= 0x1c;
 96	else if (c->frequency < 1630000)
 97		reg2[1] |= 0x0c;
 98	else
 99		reg2[1] |= 0x1c;
100
101	/*
102	 * The N divisor ratio (note: c->frequency is in kHz, but we
103	 * need it in Hz)
104	 */
105	prediv = (c->frequency * _R_VAL) / (_ri / 1000);
106	div = prediv / _P_VAL;
107	reg1[1] |= (div >> 9) & 0x03;
108	reg1[2] = div >> 1;
109	reg1[3] = (div << 7);
110	priv->frequency = ((div * _P_VAL) * (_ri / 1000)) / _R_VAL;
111
112	// Finally, calculate and store the value for A
113	reg1[3] |= (prediv - (div*_P_VAL)) & 0x7f;
114
115#undef _R_VAL
116#undef _P_VAL
117#undef _ri
118
119	if (fe->ops.i2c_gate_ctrl)
120		fe->ops.i2c_gate_ctrl(fe, 1);
121	if (i2c_transfer(priv->i2c, &msg0, 1) != 1)
122		return -EIO;
123
124	if (fe->ops.i2c_gate_ctrl)
125		fe->ops.i2c_gate_ctrl(fe, 1);
126	if (i2c_transfer(priv->i2c, &msg2, 1) != 1)
127		return -EIO;
128
129	if (fe->ops.i2c_gate_ctrl)
130		fe->ops.i2c_gate_ctrl(fe, 1);
131	if (i2c_transfer(priv->i2c, &msg1, 1) != 1)
132		return -EIO;
133
134	if (fe->ops.i2c_gate_ctrl)
135		fe->ops.i2c_gate_ctrl(fe, 0);
136
137	return 0;
138}
139
140static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
141{
142	struct tua6100_priv *priv = fe->tuner_priv;
143	*frequency = priv->frequency;
144	return 0;
145}
146
147static const struct dvb_tuner_ops tua6100_tuner_ops = {
148	.info = {
149		.name = "Infineon TUA6100",
150		.frequency_min_hz  =  950 * MHz,
151		.frequency_max_hz  = 2150 * MHz,
152		.frequency_step_hz =    1 * MHz,
153	},
154	.release = tua6100_release,
155	.sleep = tua6100_sleep,
156	.set_params = tua6100_set_params,
157	.get_frequency = tua6100_get_frequency,
158};
159
160struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c)
161{
162	struct tua6100_priv *priv = NULL;
163	u8 b1 [] = { 0x80 };
164	u8 b2 [] = { 0x00 };
165	struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 },
166				  { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } };
167	int ret;
168
169	if (fe->ops.i2c_gate_ctrl)
170		fe->ops.i2c_gate_ctrl(fe, 1);
171	ret = i2c_transfer (i2c, msg, 2);
172	if (fe->ops.i2c_gate_ctrl)
173		fe->ops.i2c_gate_ctrl(fe, 0);
174
175	if (ret != 2)
176		return NULL;
177
178	priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL);
179	if (priv == NULL)
180		return NULL;
181
182	priv->i2c_address = addr;
183	priv->i2c = i2c;
184
185	memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops));
186	fe->tuner_priv = priv;
187	return fe;
188}
189EXPORT_SYMBOL_GPL(tua6100_attach);
190
191MODULE_DESCRIPTION("DVB tua6100 driver");
192MODULE_AUTHOR("Andrew de Quincey");
193MODULE_LICENSE("GPL");