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Diffstat (limited to 'drivers/media/dvb/frontends/tda665x.c')
-rw-r--r--drivers/media/dvb/frontends/tda665x.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/tda665x.c b/drivers/media/dvb/frontends/tda665x.c
new file mode 100644
index 000000000000..87d52739c828
--- /dev/null
+++ b/drivers/media/dvb/frontends/tda665x.c
@@ -0,0 +1,257 @@
1/*
2 TDA665x tuner driver
3 Copyright (C) Manu Abraham (abraham.manu@gmail.com)
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18*/
19
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23
24#include "dvb_frontend.h"
25#include "tda665x.h"
26
27struct tda665x_state {
28 struct dvb_frontend *fe;
29 struct i2c_adapter *i2c;
30 const struct tda665x_config *config;
31
32 u32 frequency;
33 u32 bandwidth;
34};
35
36static int tda665x_read(struct tda665x_state *state, u8 *buf)
37{
38 const struct tda665x_config *config = state->config;
39 int err = 0;
40 struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD, .buf = buf, .len = 2 };
41
42 err = i2c_transfer(state->i2c, &msg, 1);
43 if (err != 1)
44 goto exit;
45
46 return err;
47exit:
48 printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
49 return err;
50}
51
52static int tda665x_write(struct tda665x_state *state, u8 *buf, u8 length)
53{
54 const struct tda665x_config *config = state->config;
55 int err = 0;
56 struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = length };
57
58 err = i2c_transfer(state->i2c, &msg, 1);
59 if (err != 1)
60 goto exit;
61
62 return err;
63exit:
64 printk(KERN_ERR "%s: I/O Error err=<%d>\n", __func__, err);
65 return err;
66}
67
68static int tda665x_get_state(struct dvb_frontend *fe,
69 enum tuner_param param,
70 struct tuner_state *tstate)
71{
72 struct tda665x_state *state = fe->tuner_priv;
73 int err = 0;
74
75 switch (param) {
76 case DVBFE_TUNER_FREQUENCY:
77 tstate->frequency = state->frequency;
78 break;
79 case DVBFE_TUNER_BANDWIDTH:
80 break;
81 default:
82 printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
83 err = -EINVAL;
84 break;
85 }
86
87 return err;
88}
89
90static int tda665x_get_status(struct dvb_frontend *fe, u32 *status)
91{
92 struct tda665x_state *state = fe->tuner_priv;
93 u8 result = 0;
94 int err = 0;
95
96 *status = 0;
97
98 err = tda665x_read(state, &result);
99 if (err < 0)
100 goto exit;
101
102 if ((result >> 6) & 0x01) {
103 printk(KERN_DEBUG "%s: Tuner Phase Locked\n", __func__);
104 *status = 1;
105 }
106
107 return err;
108exit:
109 printk(KERN_ERR "%s: I/O Error\n", __func__);
110 return err;
111}
112
113static int tda665x_set_state(struct dvb_frontend *fe,
114 enum tuner_param param,
115 struct tuner_state *tstate)
116{
117 struct tda665x_state *state = fe->tuner_priv;
118 const struct tda665x_config *config = state->config;
119 u32 frequency, status = 0;
120 u8 buf[4];
121 int err = 0;
122
123 if (param & DVBFE_TUNER_FREQUENCY) {
124
125 frequency = tstate->frequency;
126 if ((frequency < config->frequency_max) || (frequency > config->frequency_min)) {
127 printk(KERN_ERR "%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
128 return -EINVAL;
129 }
130
131 frequency += config->frequency_offst;
132 frequency *= config->ref_multiplier;
133 frequency += config->ref_divider >> 1;
134 frequency /= config->ref_divider;
135
136 buf[0] = (u8) (frequency & 0x7f00) >> 8;
137 buf[1] = (u8) (frequency & 0x00ff) >> 0;
138 buf[2] = 0x80 | 0x40 | 0x02;
139 buf[3] = 0x00;
140
141 /* restore frequency */
142 frequency = tstate->frequency;
143
144 if (frequency < 153000000) {
145 /* VHF-L */
146 buf[3] |= 0x01; /* fc, Low Band, 47 - 153 MHz */
147 if (frequency < 68000000)
148 buf[3] |= 0x40; /* 83uA */
149 if (frequency < 1040000000)
150 buf[3] |= 0x60; /* 122uA */
151 if (frequency < 1250000000)
152 buf[3] |= 0x80; /* 163uA */
153 else
154 buf[3] |= 0xa0; /* 254uA */
155 } else if (frequency < 438000000) {
156 /* VHF-H */
157 buf[3] |= 0x02; /* fc, Mid Band, 153 - 438 MHz */
158 if (frequency < 230000000)
159 buf[3] |= 0x40;
160 if (frequency < 300000000)
161 buf[3] |= 0x60;
162 else
163 buf[3] |= 0x80;
164 } else {
165 /* UHF */
166 buf[3] |= 0x04; /* fc, High Band, 438 - 862 MHz */
167 if (frequency < 470000000)
168 buf[3] |= 0x60;
169 if (frequency < 526000000)
170 buf[3] |= 0x80;
171 else
172 buf[3] |= 0xa0;
173 }
174
175 /* Set params */
176 err = tda665x_write(state, buf, 5);
177 if (err < 0)
178 goto exit;
179
180 /* sleep for some time */
181 printk(KERN_DEBUG "%s: Waiting to Phase LOCK\n", __func__);
182 msleep(20);
183 /* check status */
184 err = tda665x_get_status(fe, &status);
185 if (err < 0)
186 goto exit;
187
188 if (status == 1) {
189 printk(KERN_DEBUG "%s: Tuner Phase locked: status=%d\n", __func__, status);
190 state->frequency = frequency; /* cache successful state */
191 } else {
192 printk(KERN_ERR "%s: No Phase lock: status=%d\n", __func__, status);
193 }
194 } else {
195 printk(KERN_ERR "%s: Unknown parameter (param=%d)\n", __func__, param);
196 return -EINVAL;
197 }
198
199 return 0;
200exit:
201 printk(KERN_ERR "%s: I/O Error\n", __func__);
202 return err;
203}
204
205static int tda665x_release(struct dvb_frontend *fe)
206{
207 struct tda665x_state *state = fe->tuner_priv;
208
209 fe->tuner_priv = NULL;
210 kfree(state);
211 return 0;
212}
213
214static struct dvb_tuner_ops tda665x_ops = {
215
216 .set_state = tda665x_set_state,
217 .get_state = tda665x_get_state,
218 .get_status = tda665x_get_status,
219 .release = tda665x_release
220};
221
222struct dvb_frontend *tda665x_attach(struct dvb_frontend *fe,
223 const struct tda665x_config *config,
224 struct i2c_adapter *i2c)
225{
226 struct tda665x_state *state = NULL;
227 struct dvb_tuner_info *info;
228
229 state = kzalloc(sizeof(struct tda665x_state), GFP_KERNEL);
230 if (state == NULL)
231 goto exit;
232
233 state->config = config;
234 state->i2c = i2c;
235 state->fe = fe;
236 fe->tuner_priv = state;
237 fe->ops.tuner_ops = tda665x_ops;
238 info = &fe->ops.tuner_ops.info;
239
240 memcpy(info->name, config->name, sizeof(config->name));
241 info->frequency_min = config->frequency_min;
242 info->frequency_max = config->frequency_max;
243 info->frequency_step = config->frequency_offst;
244
245 printk(KERN_DEBUG "%s: Attaching TDA665x (%s) tuner\n", __func__, info->name);
246
247 return fe;
248
249exit:
250 kfree(state);
251 return NULL;
252}
253EXPORT_SYMBOL(tda665x_attach);
254
255MODULE_DESCRIPTION("TDA665x driver");
256MODULE_AUTHOR("Manu Abraham");
257MODULE_LICENSE("GPL");