Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / media / dvb / frontends / tua6100.c
blob029384d1fdddd0caa08a333b37fb50968df0caa5
1 /**
2 * Driver for Infineon tua6100 pll.
4 * (c) 2006 Andrew de Quincey
6 * Based on code found in budget-av.c, which has the following:
7 * Compiled from various sources by Michael Hunold <michael@mihu.de>
9 * CI interface support (c) 2004 Olivier Gournet <ogournet@anevia.com> &
10 * Andrew de Quincey <adq_dvb@lidskialf.net>
12 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
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.
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.
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.
31 #include <linux/slab.h>
32 #include <linux/module.h>
33 #include <linux/dvb/frontend.h>
34 #include <asm/types.h>
36 #include "tua6100.h"
38 struct tua6100_priv {
39 /* i2c details */
40 int i2c_address;
41 struct i2c_adapter *i2c;
42 u32 frequency;
45 static int tua6100_release(struct dvb_frontend *fe)
47 kfree(fe->tuner_priv);
48 fe->tuner_priv = NULL;
49 return 0;
52 static int tua6100_sleep(struct dvb_frontend *fe)
54 struct tua6100_priv *priv = fe->tuner_priv;
55 int ret;
56 u8 reg0[] = { 0x00, 0x00 };
57 struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
59 if (fe->ops.i2c_gate_ctrl)
60 fe->ops.i2c_gate_ctrl(fe, 1);
61 if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) {
62 printk("%s: i2c error\n", __func__);
64 if (fe->ops.i2c_gate_ctrl)
65 fe->ops.i2c_gate_ctrl(fe, 0);
67 return (ret == 1) ? 0 : ret;
70 static int tua6100_set_params(struct dvb_frontend *fe)
72 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
73 struct tua6100_priv *priv = fe->tuner_priv;
74 u32 div;
75 u32 prediv;
76 u8 reg0[] = { 0x00, 0x00 };
77 u8 reg1[] = { 0x01, 0x00, 0x00, 0x00 };
78 u8 reg2[] = { 0x02, 0x00, 0x00 };
79 struct i2c_msg msg0 = { .addr = priv->i2c_address, .flags = 0, .buf = reg0, .len = 2 };
80 struct i2c_msg msg1 = { .addr = priv->i2c_address, .flags = 0, .buf = reg1, .len = 4 };
81 struct i2c_msg msg2 = { .addr = priv->i2c_address, .flags = 0, .buf = reg2, .len = 3 };
83 #define _R 4
84 #define _P 32
85 #define _ri 4000000
87 // setup register 0
88 if (c->frequency < 2000000)
89 reg0[1] = 0x03;
90 else
91 reg0[1] = 0x07;
93 // setup register 1
94 if (c->frequency < 1630000)
95 reg1[1] = 0x2c;
96 else
97 reg1[1] = 0x0c;
99 if (_P == 64)
100 reg1[1] |= 0x40;
101 if (c->frequency >= 1525000)
102 reg1[1] |= 0x80;
104 // register 2
105 reg2[1] = (_R >> 8) & 0x03;
106 reg2[2] = _R;
107 if (c->frequency < 1455000)
108 reg2[1] |= 0x1c;
109 else if (c->frequency < 1630000)
110 reg2[1] |= 0x0c;
111 else
112 reg2[1] |= 0x1c;
115 * The N divisor ratio (note: c->frequency is in kHz, but we
116 * need it in Hz)
118 prediv = (c->frequency * _R) / (_ri / 1000);
119 div = prediv / _P;
120 reg1[1] |= (div >> 9) & 0x03;
121 reg1[2] = div >> 1;
122 reg1[3] = (div << 7);
123 priv->frequency = ((div * _P) * (_ri / 1000)) / _R;
125 // Finally, calculate and store the value for A
126 reg1[3] |= (prediv - (div*_P)) & 0x7f;
128 #undef _R
129 #undef _P
130 #undef _ri
132 if (fe->ops.i2c_gate_ctrl)
133 fe->ops.i2c_gate_ctrl(fe, 1);
134 if (i2c_transfer(priv->i2c, &msg0, 1) != 1)
135 return -EIO;
137 if (fe->ops.i2c_gate_ctrl)
138 fe->ops.i2c_gate_ctrl(fe, 1);
139 if (i2c_transfer(priv->i2c, &msg2, 1) != 1)
140 return -EIO;
142 if (fe->ops.i2c_gate_ctrl)
143 fe->ops.i2c_gate_ctrl(fe, 1);
144 if (i2c_transfer(priv->i2c, &msg1, 1) != 1)
145 return -EIO;
147 if (fe->ops.i2c_gate_ctrl)
148 fe->ops.i2c_gate_ctrl(fe, 0);
150 return 0;
153 static int tua6100_get_frequency(struct dvb_frontend *fe, u32 *frequency)
155 struct tua6100_priv *priv = fe->tuner_priv;
156 *frequency = priv->frequency;
157 return 0;
160 static struct dvb_tuner_ops tua6100_tuner_ops = {
161 .info = {
162 .name = "Infineon TUA6100",
163 .frequency_min = 950000,
164 .frequency_max = 2150000,
165 .frequency_step = 1000,
167 .release = tua6100_release,
168 .sleep = tua6100_sleep,
169 .set_params = tua6100_set_params,
170 .get_frequency = tua6100_get_frequency,
173 struct dvb_frontend *tua6100_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c)
175 struct tua6100_priv *priv = NULL;
176 u8 b1 [] = { 0x80 };
177 u8 b2 [] = { 0x00 };
178 struct i2c_msg msg [] = { { .addr = addr, .flags = 0, .buf = b1, .len = 1 },
179 { .addr = addr, .flags = I2C_M_RD, .buf = b2, .len = 1 } };
180 int ret;
182 if (fe->ops.i2c_gate_ctrl)
183 fe->ops.i2c_gate_ctrl(fe, 1);
184 ret = i2c_transfer (i2c, msg, 2);
185 if (fe->ops.i2c_gate_ctrl)
186 fe->ops.i2c_gate_ctrl(fe, 0);
188 if (ret != 2)
189 return NULL;
191 priv = kzalloc(sizeof(struct tua6100_priv), GFP_KERNEL);
192 if (priv == NULL)
193 return NULL;
195 priv->i2c_address = addr;
196 priv->i2c = i2c;
198 memcpy(&fe->ops.tuner_ops, &tua6100_tuner_ops, sizeof(struct dvb_tuner_ops));
199 fe->tuner_priv = priv;
200 return fe;
202 EXPORT_SYMBOL(tua6100_attach);
204 MODULE_DESCRIPTION("DVB tua6100 driver");
205 MODULE_AUTHOR("Andrew de Quincey");
206 MODULE_LICENSE("GPL");