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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 | { | |
2213918a | 46 | kfree(fe->tuner_priv); |
00be2e7c AQ |
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", __FUNCTION__); | |
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"); |