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6bca3580 AQ |
1 | /* |
2 | Driver for Philips tda8262/tda8263 DVBS Silicon tuners | |
3 | ||
4 | (c) 2006 Andrew de Quincey | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ||
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
20 | ||
21 | */ | |
22 | ||
5a0e3ad6 | 23 | #include <linux/slab.h> |
6bca3580 AQ |
24 | #include <linux/module.h> |
25 | #include <linux/dvb/frontend.h> | |
26 | #include <asm/types.h> | |
27 | ||
28 | #include "tda826x.h" | |
29 | ||
ff699e6b | 30 | static int debug; |
8b9a4664 AQ |
31 | #define dprintk(args...) \ |
32 | do { \ | |
33 | if (debug) printk(KERN_DEBUG "tda826x: " args); \ | |
34 | } while (0) | |
35 | ||
6bca3580 AQ |
36 | struct tda826x_priv { |
37 | /* i2c details */ | |
38 | int i2c_address; | |
39 | struct i2c_adapter *i2c; | |
40 | u8 has_loopthrough:1; | |
41 | u32 frequency; | |
42 | }; | |
43 | ||
44 | static int tda826x_release(struct dvb_frontend *fe) | |
45 | { | |
2213918a | 46 | kfree(fe->tuner_priv); |
6bca3580 AQ |
47 | fe->tuner_priv = NULL; |
48 | return 0; | |
49 | } | |
50 | ||
51 | static int tda826x_sleep(struct dvb_frontend *fe) | |
52 | { | |
53 | struct tda826x_priv *priv = fe->tuner_priv; | |
54 | int ret; | |
55 | u8 buf [] = { 0x00, 0x8d }; | |
56 | struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 2 }; | |
57 | ||
271ddbf7 | 58 | dprintk("%s:\n", __func__); |
8b9a4664 | 59 | |
6bca3580 AQ |
60 | if (!priv->has_loopthrough) |
61 | buf[1] = 0xad; | |
62 | ||
63 | if (fe->ops.i2c_gate_ctrl) | |
64 | fe->ops.i2c_gate_ctrl(fe, 1); | |
65 | if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { | |
271ddbf7 | 66 | dprintk("%s: i2c error\n", __func__); |
6bca3580 AQ |
67 | } |
68 | if (fe->ops.i2c_gate_ctrl) | |
69 | fe->ops.i2c_gate_ctrl(fe, 0); | |
6bca3580 AQ |
70 | |
71 | return (ret == 1) ? 0 : ret; | |
72 | } | |
73 | ||
74 | static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_parameters *params) | |
75 | { | |
76 | struct tda826x_priv *priv = fe->tuner_priv; | |
77 | int ret; | |
78 | u32 div; | |
3ff9a81b HH |
79 | u32 ksyms; |
80 | u32 bandwidth; | |
6bca3580 AQ |
81 | u8 buf [11]; |
82 | struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 }; | |
83 | ||
271ddbf7 | 84 | dprintk("%s:\n", __func__); |
8b9a4664 | 85 | |
6bca3580 AQ |
86 | div = (params->frequency + (1000-1)) / 1000; |
87 | ||
3ff9a81b HH |
88 | /* BW = ((1 + RO) * SR/2 + 5) * 1.3 [SR in MSPS, BW in MHz] */ |
89 | /* with R0 = 0.35 and some transformations: */ | |
90 | ksyms = params->u.qpsk.symbol_rate / 1000; | |
91 | bandwidth = (878 * ksyms + 6500000) / 1000000 + 1; | |
92 | if (bandwidth < 5) | |
93 | bandwidth = 5; | |
94 | else if (bandwidth > 36) | |
95 | bandwidth = 36; | |
96 | ||
6bca3580 AQ |
97 | buf[0] = 0x00; // subaddress |
98 | buf[1] = 0x09; // powerdown RSSI + the magic value 1 | |
99 | if (!priv->has_loopthrough) | |
100 | buf[1] |= 0x20; // power down loopthrough if not needed | |
101 | buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO | |
102 | buf[3] = div >> 7; | |
103 | buf[4] = div << 1; | |
3ff9a81b | 104 | buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */ |
c6604150 | 105 | buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation |
6bca3580 AQ |
106 | buf[7] = 0x83; // charge pumps at high, tests off |
107 | buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports. | |
108 | buf[9] = 0x1a; // normal caltime + recommended values for SELTH + SELVTL | |
109 | buf[10] = 0xd4; // recommended value 13 for BBIAS + unknown bit set on | |
110 | ||
111 | if (fe->ops.i2c_gate_ctrl) | |
112 | fe->ops.i2c_gate_ctrl(fe, 1); | |
113 | if ((ret = i2c_transfer (priv->i2c, &msg, 1)) != 1) { | |
271ddbf7 | 114 | dprintk("%s: i2c error\n", __func__); |
6bca3580 AQ |
115 | } |
116 | if (fe->ops.i2c_gate_ctrl) | |
117 | fe->ops.i2c_gate_ctrl(fe, 0); | |
118 | ||
119 | priv->frequency = div * 1000; | |
6bca3580 AQ |
120 | |
121 | return (ret == 1) ? 0 : ret; | |
122 | } | |
123 | ||
124 | static int tda826x_get_frequency(struct dvb_frontend *fe, u32 *frequency) | |
125 | { | |
126 | struct tda826x_priv *priv = fe->tuner_priv; | |
127 | *frequency = priv->frequency; | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static struct dvb_tuner_ops tda826x_tuner_ops = { | |
ef09c071 TP |
132 | .info = { |
133 | .name = "Philips TDA826X", | |
134 | .frequency_min = 950000, | |
d027c4dc | 135 | .frequency_max = 2175000 |
ef09c071 | 136 | }, |
6bca3580 AQ |
137 | .release = tda826x_release, |
138 | .sleep = tda826x_sleep, | |
139 | .set_params = tda826x_set_params, | |
140 | .get_frequency = tda826x_get_frequency, | |
141 | }; | |
142 | ||
143 | struct dvb_frontend *tda826x_attach(struct dvb_frontend *fe, int addr, struct i2c_adapter *i2c, int has_loopthrough) | |
144 | { | |
145 | struct tda826x_priv *priv = NULL; | |
146 | u8 b1 [] = { 0, 0 }; | |
8949f1a2 PB |
147 | struct i2c_msg msg[2] = { |
148 | { .addr = addr, .flags = 0, .buf = NULL, .len = 0 }, | |
149 | { .addr = addr, .flags = I2C_M_RD, .buf = b1, .len = 2 } | |
150 | }; | |
6bca3580 AQ |
151 | int ret; |
152 | ||
271ddbf7 | 153 | dprintk("%s:\n", __func__); |
8b9a4664 | 154 | |
6bca3580 AQ |
155 | if (fe->ops.i2c_gate_ctrl) |
156 | fe->ops.i2c_gate_ctrl(fe, 1); | |
8949f1a2 | 157 | ret = i2c_transfer (i2c, msg, 2); |
6bca3580 AQ |
158 | if (fe->ops.i2c_gate_ctrl) |
159 | fe->ops.i2c_gate_ctrl(fe, 0); | |
160 | ||
8949f1a2 | 161 | if (ret != 2) |
6bca3580 AQ |
162 | return NULL; |
163 | if (!(b1[1] & 0x80)) | |
164 | return NULL; | |
165 | ||
166 | priv = kzalloc(sizeof(struct tda826x_priv), GFP_KERNEL); | |
167 | if (priv == NULL) | |
168 | return NULL; | |
169 | ||
170 | priv->i2c_address = addr; | |
171 | priv->i2c = i2c; | |
172 | priv->has_loopthrough = has_loopthrough; | |
173 | ||
174 | memcpy(&fe->ops.tuner_ops, &tda826x_tuner_ops, sizeof(struct dvb_tuner_ops)); | |
6bca3580 AQ |
175 | |
176 | fe->tuner_priv = priv; | |
6bca3580 AQ |
177 | |
178 | return fe; | |
179 | } | |
180 | EXPORT_SYMBOL(tda826x_attach); | |
181 | ||
8b9a4664 AQ |
182 | module_param(debug, int, 0644); |
183 | MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off)."); | |
184 | ||
6bca3580 AQ |
185 | MODULE_DESCRIPTION("DVB TDA826x driver"); |
186 | MODULE_AUTHOR("Andrew de Quincey"); | |
187 | MODULE_LICENSE("GPL"); |