1 /**
2 * Driver for Infineon tua6100 pll.
3 *
4 * (c) 2006 Andrew de Quincey
5 *
6 * Based on code found in budget-av.c, which has the following:
7 * Compiled from various sources by Michael Hunold <michael@mihu.de>
8 *
9 * CI interface support (c) 2004 Olivier Gournet <ogournet@anevia.com> &
10 * Andrew de Quincey <adq_dvb@lidskialf.net>
11 *
12 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
13 *
14 * Copyright (C) 1999-2002 Ralph Metzler
15 * & Marcus Metzler for convergence integrated media GmbH
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 */
30
31 #include <linux/module.h>
32 #include <linux/dvb/frontend.h>
33 #include <asm/types.h>
34
35 #include "tua6100.h"
36
37 struct tua6100_priv {
38 /* i2c details */
39 int i2c_address;
40 struct i2c_adapter *i2c;
41 u32 frequency;
42 };
43
44 static int tua6100_release(struct dvb_frontend *fe)
45 {
46 kfree(fe->tuner_priv);
47 fe->tuner_priv = NULL;
48 return 0;
49 }
50
51 static int tua6100_sleep(struct dvb_frontend *fe)
52 {
53 struct tua6100_priv *priv = fe->tuner_priv;
54 int ret;
55 u8 reg0[] = { 0x00, 0x00 };
56 struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
57
58 if (fe->ops.i2c_gate_ctrl)
59 fe->ops.i2c_gate_ctrl(fe, 1);
60 if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
61 printk("%s: i2c error\n", __func__);
62 }
63 if (fe->ops.i2c_gate_ctrl)
64 fe->ops.i2c_gate_ctrl(fe, 0);
65
66 return (ret == 1) ? 0 : ret;
67 }
68
69 static int tua6100_set_params(struct dvb_frontend *fe,
70 struct dvb_frontend_parameters *params)
71 {
72 struct tua6100_priv *priv = fe->tuner_priv;
73 u32 div;
74 u32 prediv;
75 u8 reg0[] = { 0x00, 0x00 };
76 u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 };
77 u8 reg2[] = { 0x02, 0x00, 0x00 };
78 struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
79 struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 };
80 struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 };
81
82 #define _R 4
83 #define _P 32
84 #define _ri 4000000
85
86 // setup register 0
87 if (params->frequency < 2000000) {
88 reg0[1] = 0x03;
89 } else {
90 reg0[1] = 0x07;
91 }
92
93 // setup register 1
94 if (params->frequency < 1630000) {
95 reg1[1] = 0x2c;
96 } else {
97 reg1[1] = 0x0c;
98 }
99 if (_P == 64)
100 reg1[1] |= 0x40;
101 if (params->frequency >= 1525000)
102 reg1[1] |= 0x80;
103
104 // register 2
105 reg2[1] = (_R >> 8) & 0x03;
106 reg2[2] = _R;
107 if (params->frequency < 1455000) {
108 reg2[1] |= 0x1c;
109 } else if (params->frequency < 1630000) {
110 reg2[1] |= 0x0c;
111 } else {
112 reg2[1] |= 0x1c;
113 }
114
115 // The N divisor ratio (note: params->frequency is in kHz, but we need it in Hz)
116 prediv = (params->frequency * _R) / (_ri / 1000);
117 div = prediv / _P;
118 reg1[1] |= (div >> 9) & 0x03;
119 reg1[2] = div >> 1;
120 reg1[3] = (div << 7);
121 priv->frequency = ((div * _P) * (_ri / 1000)) / _R;
122
123 // Finally, calculate and store the value for A
124 reg1[3] |= (prediv - (div*_P)) & 0x7f;
125
126 #undef _R
127 #undef _P
128 #undef _ri
129
130 if (fe->ops.i2c_gate_ctrl)
131 fe->ops.i2c_gate_ctrl(fe, 1);
132 if (i2c_transfer(priv->i2c, &msg0, 1) != 1)
133 return -EIO;
134
135 if (fe->ops.i2c_gate_ctrl)
136 fe->ops.i2c_gate_ctrl(fe, 1);
137 if (i2c_transfer(priv->i2c, &msg2, 1) != 1)
138 return -EIO;
139
140 if (fe->ops.i2c_gate_ctrl)
141 fe->ops.i2c_gate_ctrl(fe, 1);
142 if (i2c_transfer(priv->i2c, &msg1, 1) != 1)
143 return -EIO;
144
145 if (fe->ops.i2c_gate_ctrl)
146 fe->ops.i2c_gate_ctrl(fe, 0);
147
148 return 0;
149 }
150
151 static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
152 {
153 struct tua6100_priv *priv = fe->tuner_priv;
154 *frequency = priv->frequency;
155 return 0;
156 }
157
158 static struct dvb_tuner_ops tua6100_tuner_ops = {
159 .info = {
160 .name = "Infineon TUA6100",
161 .frequency_min = 950000,
162 .frequency_max = 2150000,
163 .frequency_step = 1000,
164 },
165 .release = tua6100_release,
166 .sleep = tua6100_sleep,
167 .set_params = tua6100_set_params,
168 .get_frequency = tua6100_get_frequency,
169 };
170
171 struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c)
172 {
173 struct tua6100_priv *priv = NULL;
174 u8 b1 [] = { 0x80 };
175 u8 b2 [] = { 0x00 };
176 struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 },
177 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } };
178 int ret;
179
180 if (fe->ops.i2c_gate_ctrl)
181 fe->ops.i2c_gate_ctrl(fe, 1);
182 ret = i2c_transfer (i2c, msg, 2);
183 if (fe->ops.i2c_gate_ctrl)
184 fe->ops.i2c_gate_ctrl(fe, 0);
185
186 if (ret != 2)
187 return NULL;
188
189 priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL);
190 if (priv == NULL)
191 return NULL;
192
193 priv->i2c_address = addr;
194 priv->i2c = i2c;
195
196 memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops));
197 fe->tuner_priv = priv;
198 return fe;
199 }
200 EXPORT_SYMBOL(tua6100_attach);
201
202 MODULE_DESCRIPTION("DVB tua6100 driver");
203 MODULE_AUTHOR("Andrew de Quincey");
204 MODULE_LICENSE("GPL");
205
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