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[linux-2.6.git] / drivers / media / dvb / frontends / zl10353.c
1 /*
2  * Driver for Zarlink DVB-T ZL10353 demodulator
3  *
4  * Copyright (C) 2006 Christopher Pascoe <c.pascoe@itee.uq.edu.au>
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 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/init.h>
26 #include <linux/delay.h>
27 #include <linux/string.h>
28 #include <linux/slab.h>
29
30 #include "dvb_frontend.h"
31 #include "zl10353_priv.h"
32 #include "zl10353.h"
33
34 struct zl10353_state {
35         struct i2c_adapter *i2c;
36         struct dvb_frontend frontend;
37         struct dvb_frontend_ops ops;
38
39         struct zl10353_config config;
40 };
41
42 static int debug_regs = 0;
43
44 static int zl10353_single_write(struct dvb_frontend *fe, u8 reg, u8 val)
45 {
46         struct zl10353_state *state = fe->demodulator_priv;
47         u8 buf[2] = { reg, val };
48         struct i2c_msg msg = { .addr = state->config.demod_address, .flags = 0,
49                                .buf = buf, .len = 2 };
50         int err = i2c_transfer(state->i2c, &msg, 1);
51         if (err != 1) {
52                 printk("zl10353: write to reg %x failed (err = %d)!\n", reg, err);
53                 return err;
54         }
55         return 0;
56 }
57
58 int zl10353_write(struct dvb_frontend *fe, u8 *ibuf, int ilen)
59 {
60         int err, i;
61         for (i = 0; i < ilen - 1; i++)
62                 if ((err = zl10353_single_write(fe, ibuf[0] + i, ibuf[i + 1])))
63                         return err;
64
65         return 0;
66 }
67
68 static int zl10353_read_register(struct zl10353_state *state, u8 reg)
69 {
70         int ret;
71         u8 b0[1] = { reg };
72         u8 b1[1] = { 0 };
73         struct i2c_msg msg[2] = { { .addr = state->config.demod_address,
74                                     .flags = 0,
75                                     .buf = b0, .len = 1 },
76                                   { .addr = state->config.demod_address,
77                                     .flags = I2C_M_RD,
78                                     .buf = b1, .len = 1 } };
79
80         ret = i2c_transfer(state->i2c, msg, 2);
81
82         if (ret != 2) {
83                 printk("%s: readreg error (reg=%d, ret==%i)\n",
84                        __FUNCTION__, reg, ret);
85                 return ret;
86         }
87
88         return b1[0];
89 }
90
91 static void zl10353_dump_regs(struct dvb_frontend *fe)
92 {
93         struct zl10353_state *state = fe->demodulator_priv;
94         char buf[52], buf2[4];
95         int ret;
96         u8 reg;
97
98         /* Dump all registers. */
99         for (reg = 0; ; reg++) {
100                 if (reg % 16 == 0) {
101                         if (reg)
102                                 printk(KERN_DEBUG "%s\n", buf);
103                         sprintf(buf, "%02x: ", reg);
104                 }
105                 ret = zl10353_read_register(state, reg);
106                 if (ret >= 0)
107                         sprintf(buf2, "%02x ", (u8)ret);
108                 else
109                         strcpy(buf2, "-- ");
110                 strcat(buf, buf2);
111                 if (reg == 0xff)
112                         break;
113         }
114         printk(KERN_DEBUG "%s\n", buf);
115 }
116
117 static int zl10353_sleep(struct dvb_frontend *fe)
118 {
119         static u8 zl10353_softdown[] = { 0x50, 0x0C, 0x44 };
120
121         zl10353_write(fe, zl10353_softdown, sizeof(zl10353_softdown));
122         return 0;
123 }
124
125 static int zl10353_set_parameters(struct dvb_frontend *fe,
126                                   struct dvb_frontend_parameters *param)
127 {
128         struct zl10353_state *state = fe->demodulator_priv;
129         u8 pllbuf[6] = { 0x67 };
130
131         /* These settings set "auto-everything" and start the FSM. */
132         zl10353_single_write(fe, 0x55, 0x80);
133         udelay(200);
134         zl10353_single_write(fe, 0xEA, 0x01);
135         udelay(200);
136         zl10353_single_write(fe, 0xEA, 0x00);
137
138         zl10353_single_write(fe, 0x56, 0x28);
139         zl10353_single_write(fe, 0x89, 0x20);
140         zl10353_single_write(fe, 0x5E, 0x00);
141         zl10353_single_write(fe, 0x65, 0x5A);
142         zl10353_single_write(fe, 0x66, 0xE9);
143         zl10353_single_write(fe, 0x62, 0x0A);
144
145         state->config.pll_set(fe, param, pllbuf + 1);
146         zl10353_write(fe, pllbuf, sizeof(pllbuf));
147
148         zl10353_single_write(fe, 0x70, 0x01);
149         udelay(250);
150         zl10353_single_write(fe, 0xE4, 0x00);
151         zl10353_single_write(fe, 0xE5, 0x2A);
152         zl10353_single_write(fe, 0xE9, 0x02);
153         zl10353_single_write(fe, 0xE7, 0x40);
154         zl10353_single_write(fe, 0xE8, 0x10);
155
156         return 0;
157 }
158
159 static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status)
160 {
161         struct zl10353_state *state = fe->demodulator_priv;
162         int s6, s7, s8;
163
164         if ((s6 = zl10353_read_register(state, STATUS_6)) < 0)
165                 return -EREMOTEIO;
166         if ((s7 = zl10353_read_register(state, STATUS_7)) < 0)
167                 return -EREMOTEIO;
168         if ((s8 = zl10353_read_register(state, STATUS_8)) < 0)
169                 return -EREMOTEIO;
170
171         *status = 0;
172         if (s6 & (1 << 2))
173                 *status |= FE_HAS_CARRIER;
174         if (s6 & (1 << 1))
175                 *status |= FE_HAS_VITERBI;
176         if (s6 & (1 << 5))
177                 *status |= FE_HAS_LOCK;
178         if (s7 & (1 << 4))
179                 *status |= FE_HAS_SYNC;
180         if (s8 & (1 << 6))
181                 *status |= FE_HAS_SIGNAL;
182
183         if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
184             (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
185                 *status &= ~FE_HAS_LOCK;
186
187         return 0;
188 }
189
190 static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)
191 {
192         struct zl10353_state *state = fe->demodulator_priv;
193         u8 _snr;
194
195         if (debug_regs)
196                 zl10353_dump_regs(fe);
197
198         _snr = zl10353_read_register(state, SNR);
199         *snr = (_snr << 8) | _snr;
200
201         return 0;
202 }
203
204 static int zl10353_get_tune_settings(struct dvb_frontend *fe,
205                                      struct dvb_frontend_tune_settings
206                                          *fe_tune_settings)
207 {
208         fe_tune_settings->min_delay_ms = 1000;
209         fe_tune_settings->step_size = 0;
210         fe_tune_settings->max_drift = 0;
211
212         return 0;
213 }
214
215 static int zl10353_init(struct dvb_frontend *fe)
216 {
217         struct zl10353_state *state = fe->demodulator_priv;
218         u8 zl10353_reset_attach[6] = { 0x50, 0x03, 0x64, 0x46, 0x15, 0x0F };
219         int rc = 0;
220
221         if (debug_regs)
222                 zl10353_dump_regs(fe);
223
224         /* Do a "hard" reset if not already done */
225         if (zl10353_read_register(state, 0x50) != 0x03) {
226                 rc = zl10353_write(fe, zl10353_reset_attach,
227                                    sizeof(zl10353_reset_attach));
228                 if (debug_regs)
229                         zl10353_dump_regs(fe);
230         }
231
232         return 0;
233 }
234
235 static void zl10353_release(struct dvb_frontend *fe)
236 {
237         struct zl10353_state *state = fe->demodulator_priv;
238
239         kfree(state);
240 }
241
242 static struct dvb_frontend_ops zl10353_ops;
243
244 struct dvb_frontend *zl10353_attach(const struct zl10353_config *config,
245                                     struct i2c_adapter *i2c)
246 {
247         struct zl10353_state *state = NULL;
248
249         /* allocate memory for the internal state */
250         state = kzalloc(sizeof(struct zl10353_state), GFP_KERNEL);
251         if (state == NULL)
252                 goto error;
253
254         /* setup the state */
255         state->i2c = i2c;
256         memcpy(&state->config, config, sizeof(struct zl10353_config));
257         memcpy(&state->ops, &zl10353_ops, sizeof(struct dvb_frontend_ops));
258
259         /* check if the demod is there */
260         if (zl10353_read_register(state, CHIP_ID) != ID_ZL10353)
261                 goto error;
262
263         /* create dvb_frontend */
264         state->frontend.ops = &state->ops;
265         state->frontend.demodulator_priv = state;
266
267         return &state->frontend;
268 error:
269         kfree(state);
270         return NULL;
271 }
272
273 static struct dvb_frontend_ops zl10353_ops = {
274
275         .info = {
276                 .name                   = "Zarlink ZL10353 DVB-T",
277                 .type                   = FE_OFDM,
278                 .frequency_min          = 174000000,
279                 .frequency_max          = 862000000,
280                 .frequency_stepsize     = 166667,
281                 .frequency_tolerance    = 0,
282                 .caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 |
283                         FE_CAN_FEC_3_4 | FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 |
284                         FE_CAN_FEC_AUTO |
285                         FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 | FE_CAN_QAM_AUTO |
286                         FE_CAN_TRANSMISSION_MODE_AUTO | FE_CAN_GUARD_INTERVAL_AUTO |
287                         FE_CAN_HIERARCHY_AUTO | FE_CAN_RECOVER |
288                         FE_CAN_MUTE_TS
289         },
290
291         .release = zl10353_release,
292
293         .init = zl10353_init,
294         .sleep = zl10353_sleep,
295
296         .set_frontend = zl10353_set_parameters,
297         .get_tune_settings = zl10353_get_tune_settings,
298
299         .read_status = zl10353_read_status,
300         .read_snr = zl10353_read_snr,
301 };
302
303 module_param(debug_regs, int, 0644);
304 MODULE_PARM_DESC(debug_regs, "Turn on/off frontend register dumps (default:off).");
305
306 MODULE_DESCRIPTION("Zarlink ZL10353 DVB-T demodulator driver");
307 MODULE_AUTHOR("Chris Pascoe");
308 MODULE_LICENSE("GPL");
309
310 EXPORT_SYMBOL(zl10353_attach);
311 EXPORT_SYMBOL(zl10353_write);