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Merge tag 'staging-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[karo-tx-linux.git] / drivers / media / tuners / e4000.c
1 /*
2  * Elonics E4000 silicon tuner driver
3  *
4  * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
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  *    GNU General Public License for more details.
15  *
16  *    You should have received a copy of the GNU General Public License along
17  *    with this program; if not, write to the Free Software Foundation, Inc.,
18  *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19  */
20
21 #include "e4000_priv.h"
22 #include <linux/math64.h>
23
24 /* Max transfer size done by I2C transfer functions */
25 #define MAX_XFER_SIZE  64
26
27 /* write multiple registers */
28 static int e4000_wr_regs(struct e4000_priv *priv, u8 reg, u8 *val, int len)
29 {
30         int ret;
31         u8 buf[MAX_XFER_SIZE];
32         struct i2c_msg msg[1] = {
33                 {
34                         .addr = priv->cfg->i2c_addr,
35                         .flags = 0,
36                         .len = 1 + len,
37                         .buf = buf,
38                 }
39         };
40
41         if (1 + len > sizeof(buf)) {
42                 dev_warn(&priv->i2c->dev,
43                          "%s: i2c wr reg=%04x: len=%d is too big!\n",
44                          KBUILD_MODNAME, reg, len);
45                 return -EINVAL;
46         }
47
48         buf[0] = reg;
49         memcpy(&buf[1], val, len);
50
51         ret = i2c_transfer(priv->i2c, msg, 1);
52         if (ret == 1) {
53                 ret = 0;
54         } else {
55                 dev_warn(&priv->i2c->dev,
56                                 "%s: i2c wr failed=%d reg=%02x len=%d\n",
57                                 KBUILD_MODNAME, ret, reg, len);
58                 ret = -EREMOTEIO;
59         }
60         return ret;
61 }
62
63 /* read multiple registers */
64 static int e4000_rd_regs(struct e4000_priv *priv, u8 reg, u8 *val, int len)
65 {
66         int ret;
67         u8 buf[MAX_XFER_SIZE];
68         struct i2c_msg msg[2] = {
69                 {
70                         .addr = priv->cfg->i2c_addr,
71                         .flags = 0,
72                         .len = 1,
73                         .buf = &reg,
74                 }, {
75                         .addr = priv->cfg->i2c_addr,
76                         .flags = I2C_M_RD,
77                         .len = len,
78                         .buf = buf,
79                 }
80         };
81
82         if (len > sizeof(buf)) {
83                 dev_warn(&priv->i2c->dev,
84                          "%s: i2c rd reg=%04x: len=%d is too big!\n",
85                          KBUILD_MODNAME, reg, len);
86                 return -EINVAL;
87         }
88
89         ret = i2c_transfer(priv->i2c, msg, 2);
90         if (ret == 2) {
91                 memcpy(val, buf, len);
92                 ret = 0;
93         } else {
94                 dev_warn(&priv->i2c->dev,
95                                 "%s: i2c rd failed=%d reg=%02x len=%d\n",
96                                 KBUILD_MODNAME, ret, reg, len);
97                 ret = -EREMOTEIO;
98         }
99
100         return ret;
101 }
102
103 /* write single register */
104 static int e4000_wr_reg(struct e4000_priv *priv, u8 reg, u8 val)
105 {
106         return e4000_wr_regs(priv, reg, &val, 1);
107 }
108
109 /* read single register */
110 static int e4000_rd_reg(struct e4000_priv *priv, u8 reg, u8 *val)
111 {
112         return e4000_rd_regs(priv, reg, val, 1);
113 }
114
115 static int e4000_init(struct dvb_frontend *fe)
116 {
117         struct e4000_priv *priv = fe->tuner_priv;
118         int ret;
119
120         dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
121
122         if (fe->ops.i2c_gate_ctrl)
123                 fe->ops.i2c_gate_ctrl(fe, 1);
124
125         /* dummy I2C to ensure I2C wakes up */
126         ret = e4000_wr_reg(priv, 0x02, 0x40);
127
128         /* reset */
129         ret = e4000_wr_reg(priv, 0x00, 0x01);
130         if (ret < 0)
131                 goto err;
132
133         /* disable output clock */
134         ret = e4000_wr_reg(priv, 0x06, 0x00);
135         if (ret < 0)
136                 goto err;
137
138         ret = e4000_wr_reg(priv, 0x7a, 0x96);
139         if (ret < 0)
140                 goto err;
141
142         /* configure gains */
143         ret = e4000_wr_regs(priv, 0x7e, "\x01\xfe", 2);
144         if (ret < 0)
145                 goto err;
146
147         ret = e4000_wr_reg(priv, 0x82, 0x00);
148         if (ret < 0)
149                 goto err;
150
151         ret = e4000_wr_reg(priv, 0x24, 0x05);
152         if (ret < 0)
153                 goto err;
154
155         ret = e4000_wr_regs(priv, 0x87, "\x20\x01", 2);
156         if (ret < 0)
157                 goto err;
158
159         ret = e4000_wr_regs(priv, 0x9f, "\x7f\x07", 2);
160         if (ret < 0)
161                 goto err;
162
163         /* DC offset control */
164         ret = e4000_wr_reg(priv, 0x2d, 0x1f);
165         if (ret < 0)
166                 goto err;
167
168         ret = e4000_wr_regs(priv, 0x70, "\x01\x01", 2);
169         if (ret < 0)
170                 goto err;
171
172         /* gain control */
173         ret = e4000_wr_reg(priv, 0x1a, 0x17);
174         if (ret < 0)
175                 goto err;
176
177         ret = e4000_wr_reg(priv, 0x1f, 0x1a);
178         if (ret < 0)
179                 goto err;
180
181         if (fe->ops.i2c_gate_ctrl)
182                 fe->ops.i2c_gate_ctrl(fe, 0);
183
184         return 0;
185 err:
186         if (fe->ops.i2c_gate_ctrl)
187                 fe->ops.i2c_gate_ctrl(fe, 0);
188
189         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
190         return ret;
191 }
192
193 static int e4000_sleep(struct dvb_frontend *fe)
194 {
195         struct e4000_priv *priv = fe->tuner_priv;
196         int ret;
197
198         dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
199
200         if (fe->ops.i2c_gate_ctrl)
201                 fe->ops.i2c_gate_ctrl(fe, 1);
202
203         ret = e4000_wr_reg(priv, 0x00, 0x00);
204         if (ret < 0)
205                 goto err;
206
207         if (fe->ops.i2c_gate_ctrl)
208                 fe->ops.i2c_gate_ctrl(fe, 0);
209
210         return 0;
211 err:
212         if (fe->ops.i2c_gate_ctrl)
213                 fe->ops.i2c_gate_ctrl(fe, 0);
214
215         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
216         return ret;
217 }
218
219 static int e4000_set_params(struct dvb_frontend *fe)
220 {
221         struct e4000_priv *priv = fe->tuner_priv;
222         struct dtv_frontend_properties *c = &fe->dtv_property_cache;
223         int ret, i, sigma_delta;
224         unsigned int f_vco;
225         u8 buf[5], i_data[4], q_data[4];
226
227         dev_dbg(&priv->i2c->dev,
228                         "%s: delivery_system=%d frequency=%d bandwidth_hz=%d\n",
229                         __func__, c->delivery_system, c->frequency,
230                         c->bandwidth_hz);
231
232         if (fe->ops.i2c_gate_ctrl)
233                 fe->ops.i2c_gate_ctrl(fe, 1);
234
235         /* gain control manual */
236         ret = e4000_wr_reg(priv, 0x1a, 0x00);
237         if (ret < 0)
238                 goto err;
239
240         /* PLL */
241         for (i = 0; i < ARRAY_SIZE(e4000_pll_lut); i++) {
242                 if (c->frequency <= e4000_pll_lut[i].freq)
243                         break;
244         }
245
246         if (i == ARRAY_SIZE(e4000_pll_lut)) {
247                 ret = -EINVAL;
248                 goto err;
249         }
250
251         /*
252          * Note: Currently f_vco overflows when c->frequency is 1 073 741 824 Hz
253          * or more.
254          */
255         f_vco = c->frequency * e4000_pll_lut[i].mul;
256         sigma_delta = div_u64(0x10000ULL * (f_vco % priv->cfg->clock), priv->cfg->clock);
257         buf[0] = f_vco / priv->cfg->clock;
258         buf[1] = (sigma_delta >> 0) & 0xff;
259         buf[2] = (sigma_delta >> 8) & 0xff;
260         buf[3] = 0x00;
261         buf[4] = e4000_pll_lut[i].div;
262
263         dev_dbg(&priv->i2c->dev, "%s: f_vco=%u pll div=%d sigma_delta=%04x\n",
264                         __func__, f_vco, buf[0], sigma_delta);
265
266         ret = e4000_wr_regs(priv, 0x09, buf, 5);
267         if (ret < 0)
268                 goto err;
269
270         /* LNA filter (RF filter) */
271         for (i = 0; i < ARRAY_SIZE(e400_lna_filter_lut); i++) {
272                 if (c->frequency <= e400_lna_filter_lut[i].freq)
273                         break;
274         }
275
276         if (i == ARRAY_SIZE(e400_lna_filter_lut)) {
277                 ret = -EINVAL;
278                 goto err;
279         }
280
281         ret = e4000_wr_reg(priv, 0x10, e400_lna_filter_lut[i].val);
282         if (ret < 0)
283                 goto err;
284
285         /* IF filters */
286         for (i = 0; i < ARRAY_SIZE(e4000_if_filter_lut); i++) {
287                 if (c->bandwidth_hz <= e4000_if_filter_lut[i].freq)
288                         break;
289         }
290
291         if (i == ARRAY_SIZE(e4000_if_filter_lut)) {
292                 ret = -EINVAL;
293                 goto err;
294         }
295
296         buf[0] = e4000_if_filter_lut[i].reg11_val;
297         buf[1] = e4000_if_filter_lut[i].reg12_val;
298
299         ret = e4000_wr_regs(priv, 0x11, buf, 2);
300         if (ret < 0)
301                 goto err;
302
303         /* frequency band */
304         for (i = 0; i < ARRAY_SIZE(e4000_band_lut); i++) {
305                 if (c->frequency <= e4000_band_lut[i].freq)
306                         break;
307         }
308
309         if (i == ARRAY_SIZE(e4000_band_lut)) {
310                 ret = -EINVAL;
311                 goto err;
312         }
313
314         ret = e4000_wr_reg(priv, 0x07, e4000_band_lut[i].reg07_val);
315         if (ret < 0)
316                 goto err;
317
318         ret = e4000_wr_reg(priv, 0x78, e4000_band_lut[i].reg78_val);
319         if (ret < 0)
320                 goto err;
321
322         /* DC offset */
323         for (i = 0; i < 4; i++) {
324                 if (i == 0)
325                         ret = e4000_wr_regs(priv, 0x15, "\x00\x7e\x24", 3);
326                 else if (i == 1)
327                         ret = e4000_wr_regs(priv, 0x15, "\x00\x7f", 2);
328                 else if (i == 2)
329                         ret = e4000_wr_regs(priv, 0x15, "\x01", 1);
330                 else
331                         ret = e4000_wr_regs(priv, 0x16, "\x7e", 1);
332
333                 if (ret < 0)
334                         goto err;
335
336                 ret = e4000_wr_reg(priv, 0x29, 0x01);
337                 if (ret < 0)
338                         goto err;
339
340                 ret = e4000_rd_regs(priv, 0x2a, buf, 3);
341                 if (ret < 0)
342                         goto err;
343
344                 i_data[i] = (((buf[2] >> 0) & 0x3) << 6) | (buf[0] & 0x3f);
345                 q_data[i] = (((buf[2] >> 4) & 0x3) << 6) | (buf[1] & 0x3f);
346         }
347
348         swap(q_data[2], q_data[3]);
349         swap(i_data[2], i_data[3]);
350
351         ret = e4000_wr_regs(priv, 0x50, q_data, 4);
352         if (ret < 0)
353                 goto err;
354
355         ret = e4000_wr_regs(priv, 0x60, i_data, 4);
356         if (ret < 0)
357                 goto err;
358
359         /* gain control auto */
360         ret = e4000_wr_reg(priv, 0x1a, 0x17);
361         if (ret < 0)
362                 goto err;
363
364         if (fe->ops.i2c_gate_ctrl)
365                 fe->ops.i2c_gate_ctrl(fe, 0);
366
367         return 0;
368 err:
369         if (fe->ops.i2c_gate_ctrl)
370                 fe->ops.i2c_gate_ctrl(fe, 0);
371
372         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
373         return ret;
374 }
375
376 static int e4000_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
377 {
378         struct e4000_priv *priv = fe->tuner_priv;
379
380         dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
381
382         *frequency = 0; /* Zero-IF */
383
384         return 0;
385 }
386
387 static int e4000_release(struct dvb_frontend *fe)
388 {
389         struct e4000_priv *priv = fe->tuner_priv;
390
391         dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
392
393         kfree(fe->tuner_priv);
394
395         return 0;
396 }
397
398 static const struct dvb_tuner_ops e4000_tuner_ops = {
399         .info = {
400                 .name           = "Elonics E4000",
401                 .frequency_min  = 174000000,
402                 .frequency_max  = 862000000,
403         },
404
405         .release = e4000_release,
406
407         .init = e4000_init,
408         .sleep = e4000_sleep,
409         .set_params = e4000_set_params,
410
411         .get_if_frequency = e4000_get_if_frequency,
412 };
413
414 struct dvb_frontend *e4000_attach(struct dvb_frontend *fe,
415                 struct i2c_adapter *i2c, const struct e4000_config *cfg)
416 {
417         struct e4000_priv *priv;
418         int ret;
419         u8 chip_id;
420
421         if (fe->ops.i2c_gate_ctrl)
422                 fe->ops.i2c_gate_ctrl(fe, 1);
423
424         priv = kzalloc(sizeof(struct e4000_priv), GFP_KERNEL);
425         if (!priv) {
426                 ret = -ENOMEM;
427                 dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
428                 goto err;
429         }
430
431         priv->cfg = cfg;
432         priv->i2c = i2c;
433
434         /* check if the tuner is there */
435         ret = e4000_rd_reg(priv, 0x02, &chip_id);
436         if (ret < 0)
437                 goto err;
438
439         dev_dbg(&priv->i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);
440
441         if (chip_id != 0x40)
442                 goto err;
443
444         /* put sleep as chip seems to be in normal mode by default */
445         ret = e4000_wr_reg(priv, 0x00, 0x00);
446         if (ret < 0)
447                 goto err;
448
449         dev_info(&priv->i2c->dev,
450                         "%s: Elonics E4000 successfully identified\n",
451                         KBUILD_MODNAME);
452
453         fe->tuner_priv = priv;
454         memcpy(&fe->ops.tuner_ops, &e4000_tuner_ops,
455                         sizeof(struct dvb_tuner_ops));
456
457         if (fe->ops.i2c_gate_ctrl)
458                 fe->ops.i2c_gate_ctrl(fe, 0);
459
460         return fe;
461 err:
462         if (fe->ops.i2c_gate_ctrl)
463                 fe->ops.i2c_gate_ctrl(fe, 0);
464
465         dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
466         kfree(priv);
467         return NULL;
468 }
469 EXPORT_SYMBOL(e4000_attach);
470
471 MODULE_DESCRIPTION("Elonics E4000 silicon tuner driver");
472 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
473 MODULE_LICENSE("GPL");