1742056a34e8c0a8270aee6a81a8ecba4917fc9e
[linux-2.6.git] / drivers / media / dvb / frontends / tda8261.c
1 /*
2         TDA8261 8PSK/QPSK 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
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25
26 #include "dvb_frontend.h"
27 #include "tda8261.h"
28
29 struct tda8261_state {
30         struct dvb_frontend             *fe;
31         struct i2c_adapter              *i2c;
32         const struct tda8261_config     *config;
33
34         /* state cache */
35         u32 frequency;
36         u32 bandwidth;
37 };
38
39 static int tda8261_read(struct tda8261_state *state, u8 *buf)
40 {
41         const struct tda8261_config *config = state->config;
42         int err = 0;
43         struct i2c_msg msg = { .addr    = config->addr, .flags = I2C_M_RD,.buf = buf,  .len = 1 };
44
45         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
46                 printk("%s: read error, err=%d\n", __func__, err);
47
48         return err;
49 }
50
51 static int tda8261_write(struct tda8261_state *state, u8 *buf)
52 {
53         const struct tda8261_config *config = state->config;
54         int err = 0;
55         struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 };
56
57         if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
58                 printk("%s: write error, err=%d\n", __func__, err);
59
60         return err;
61 }
62
63 static int tda8261_get_status(struct dvb_frontend *fe, u32 *status)
64 {
65         struct tda8261_state *state = fe->tuner_priv;
66         u8 result = 0;
67         int err = 0;
68
69         *status = 0;
70
71         if ((err = tda8261_read(state, &result)) < 0) {
72                 printk("%s: I/O Error\n", __func__);
73                 return err;
74         }
75         if ((result >> 6) & 0x01) {
76                 printk("%s: Tuner Phase Locked\n", __func__);
77                 *status = 1;
78         }
79
80         return err;
81 }
82
83 static const u32 div_tab[] = { 2000, 1000,  500,  250,  125 }; /* kHz */
84 static const u8  ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 };
85
86 static int tda8261_get_state(struct dvb_frontend *fe,
87                              enum tuner_param param,
88                              struct tuner_state *tstate)
89 {
90         struct tda8261_state *state = fe->tuner_priv;
91         int err = 0;
92
93         switch (param) {
94         case DVBFE_TUNER_FREQUENCY:
95                 tstate->frequency = state->frequency;
96                 break;
97         case DVBFE_TUNER_BANDWIDTH:
98                 tstate->bandwidth = 40000000; /* FIXME! need to calculate Bandwidth */
99                 break;
100         default:
101                 printk("%s: Unknown parameter (param=%d)\n", __func__, param);
102                 err = -EINVAL;
103                 break;
104         }
105
106         return err;
107 }
108
109 static int tda8261_set_state(struct dvb_frontend *fe,
110                              enum tuner_param param,
111                              struct tuner_state *tstate)
112 {
113         struct tda8261_state *state = fe->tuner_priv;
114         const struct tda8261_config *config = state->config;
115         u32 frequency, N, status = 0;
116         u8 buf[4];
117         int err = 0;
118
119         if (param & DVBFE_TUNER_FREQUENCY) {
120                 /**
121                  * N = Max VCO Frequency / Channel Spacing
122                  * Max VCO Frequency = VCO frequency + (channel spacing - 1)
123                  * (to account for half channel spacing on either side)
124                  */
125                 frequency = tstate->frequency;
126                 if ((frequency < 950000) || (frequency > 2150000)) {
127                         printk("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
128                         return -EINVAL;
129                 }
130                 N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
131                 printk("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n",
132                         __func__, config->step_size, div_tab[config->step_size], N, N);
133
134                 buf[0] = (N >> 8) & 0xff;
135                 buf[1] = N & 0xff;
136                 buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1);
137
138                 if (frequency < 1450000)
139                         buf[3] = 0x00;
140                 else if (frequency < 2000000)
141                         buf[3] = 0x40;
142                 else if (frequency < 2150000)
143                         buf[3] = 0x80;
144
145                 /* Set params */
146                 if ((err = tda8261_write(state, buf)) < 0) {
147                         printk("%s: I/O Error\n", __func__);
148                         return err;
149                 }
150                 /* sleep for some time */
151                 printk("%s: Waiting to Phase LOCK\n", __func__);
152                 msleep(20);
153                 /* check status */
154                 if ((err = tda8261_get_status(fe, &status)) < 0) {
155                         printk("%s: I/O Error\n", __func__);
156                         return err;
157                 }
158                 if (status == 1) {
159                         printk("%s: Tuner Phase locked: status=%d\n", __func__, status);
160                         state->frequency = frequency; /* cache successful state */
161                 } else {
162                         printk("%s: No Phase lock: status=%d\n", __func__, status);
163                 }
164         } else {
165                 printk("%s: Unknown parameter (param=%d)\n", __func__, param);
166                 return -EINVAL;
167         }
168
169         return 0;
170 }
171
172 static int tda8261_release(struct dvb_frontend *fe)
173 {
174         struct tda8261_state *state = fe->tuner_priv;
175
176         fe->tuner_priv = NULL;
177         kfree(state);
178         return 0;
179 }
180
181 static struct dvb_tuner_ops tda8261_ops = {
182
183         .info = {
184                 .name           = "TDA8261",
185 //              .tuner_name     = NULL,
186                 .frequency_min  =  950000,
187                 .frequency_max  = 2150000,
188                 .frequency_step = 0
189         },
190
191         .set_state      = tda8261_set_state,
192         .get_state      = tda8261_get_state,
193         .get_status     = tda8261_get_status,
194         .release        = tda8261_release
195 };
196
197 struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
198                                     const struct tda8261_config *config,
199                                     struct i2c_adapter *i2c)
200 {
201         struct tda8261_state *state = NULL;
202
203         if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL)
204                 goto exit;
205
206         state->config           = config;
207         state->i2c              = i2c;
208         state->fe               = fe;
209         fe->tuner_priv          = state;
210         fe->ops.tuner_ops       = tda8261_ops;
211
212         fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size];
213 //      fe->ops.tuner_ops.tuner_name     = &config->buf;
214
215 //      printk("%s: Attaching %s TDA8261 8PSK/QPSK tuner\n",
216 //              __func__, fe->ops.tuner_ops.tuner_name);
217         printk("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
218
219         return fe;
220
221 exit:
222         kfree(state);
223         return NULL;
224 }
225
226 EXPORT_SYMBOL(tda8261_attach);
227 MODULE_PARM_DESC(verbose, "Set verbosity level");
228
229 MODULE_AUTHOR("Manu Abraham");
230 MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
231 MODULE_LICENSE("GPL");