Merge branch 'topic/kbuild-fixes-for-next' of git://git.kernel.org/pub/scm/linux...
[linux-drm-fsl-dcu.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                 goto err;
248
249         /*
250          * Note: Currently f_vco overflows when c->frequency is 1 073 741 824 Hz
251          * or more.
252          */
253         f_vco = c->frequency * e4000_pll_lut[i].mul;
254         sigma_delta = div_u64(0x10000ULL * (f_vco % priv->cfg->clock), priv->cfg->clock);
255         buf[0] = f_vco / priv->cfg->clock;
256         buf[1] = (sigma_delta >> 0) & 0xff;
257         buf[2] = (sigma_delta >> 8) & 0xff;
258         buf[3] = 0x00;
259         buf[4] = e4000_pll_lut[i].div;
260
261         dev_dbg(&priv->i2c->dev, "%s: f_vco=%u pll div=%d sigma_delta=%04x\n",
262                         __func__, f_vco, buf[0], sigma_delta);
263
264         ret = e4000_wr_regs(priv, 0x09, buf, 5);
265         if (ret < 0)
266                 goto err;
267
268         /* LNA filter (RF filter) */
269         for (i = 0; i < ARRAY_SIZE(e400_lna_filter_lut); i++) {
270                 if (c->frequency <= e400_lna_filter_lut[i].freq)
271                         break;
272         }
273
274         if (i == ARRAY_SIZE(e400_lna_filter_lut))
275                 goto err;
276
277         ret = e4000_wr_reg(priv, 0x10, e400_lna_filter_lut[i].val);
278         if (ret < 0)
279                 goto err;
280
281         /* IF filters */
282         for (i = 0; i < ARRAY_SIZE(e4000_if_filter_lut); i++) {
283                 if (c->bandwidth_hz <= e4000_if_filter_lut[i].freq)
284                         break;
285         }
286
287         if (i == ARRAY_SIZE(e4000_if_filter_lut))
288                 goto err;
289
290         buf[0] = e4000_if_filter_lut[i].reg11_val;
291         buf[1] = e4000_if_filter_lut[i].reg12_val;
292
293         ret = e4000_wr_regs(priv, 0x11, buf, 2);
294         if (ret < 0)
295                 goto err;
296
297         /* frequency band */
298         for (i = 0; i < ARRAY_SIZE(e4000_band_lut); i++) {
299                 if (c->frequency <= e4000_band_lut[i].freq)
300                         break;
301         }
302
303         if (i == ARRAY_SIZE(e4000_band_lut))
304                 goto err;
305
306         ret = e4000_wr_reg(priv, 0x07, e4000_band_lut[i].reg07_val);
307         if (ret < 0)
308                 goto err;
309
310         ret = e4000_wr_reg(priv, 0x78, e4000_band_lut[i].reg78_val);
311         if (ret < 0)
312                 goto err;
313
314         /* DC offset */
315         for (i = 0; i < 4; i++) {
316                 if (i == 0)
317                         ret = e4000_wr_regs(priv, 0x15, "\x00\x7e\x24", 3);
318                 else if (i == 1)
319                         ret = e4000_wr_regs(priv, 0x15, "\x00\x7f", 2);
320                 else if (i == 2)
321                         ret = e4000_wr_regs(priv, 0x15, "\x01", 1);
322                 else
323                         ret = e4000_wr_regs(priv, 0x16, "\x7e", 1);
324
325                 if (ret < 0)
326                         goto err;
327
328                 ret = e4000_wr_reg(priv, 0x29, 0x01);
329                 if (ret < 0)
330                         goto err;
331
332                 ret = e4000_rd_regs(priv, 0x2a, buf, 3);
333                 if (ret < 0)
334                         goto err;
335
336                 i_data[i] = (((buf[2] >> 0) & 0x3) << 6) | (buf[0] & 0x3f);
337                 q_data[i] = (((buf[2] >> 4) & 0x3) << 6) | (buf[1] & 0x3f);
338         }
339
340         swap(q_data[2], q_data[3]);
341         swap(i_data[2], i_data[3]);
342
343         ret = e4000_wr_regs(priv, 0x50, q_data, 4);
344         if (ret < 0)
345                 goto err;
346
347         ret = e4000_wr_regs(priv, 0x60, i_data, 4);
348         if (ret < 0)
349                 goto err;
350
351         /* gain control auto */
352         ret = e4000_wr_reg(priv, 0x1a, 0x17);
353         if (ret < 0)
354                 goto err;
355
356         if (fe->ops.i2c_gate_ctrl)
357                 fe->ops.i2c_gate_ctrl(fe, 0);
358
359         return 0;
360 err:
361         if (fe->ops.i2c_gate_ctrl)
362                 fe->ops.i2c_gate_ctrl(fe, 0);
363
364         dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
365         return ret;
366 }
367
368 static int e4000_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
369 {
370         struct e4000_priv *priv = fe->tuner_priv;
371
372         dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
373
374         *frequency = 0; /* Zero-IF */
375
376         return 0;
377 }
378
379 static int e4000_release(struct dvb_frontend *fe)
380 {
381         struct e4000_priv *priv = fe->tuner_priv;
382
383         dev_dbg(&priv->i2c->dev, "%s:\n", __func__);
384
385         kfree(fe->tuner_priv);
386
387         return 0;
388 }
389
390 static const struct dvb_tuner_ops e4000_tuner_ops = {
391         .info = {
392                 .name           = "Elonics E4000",
393                 .frequency_min  = 174000000,
394                 .frequency_max  = 862000000,
395         },
396
397         .release = e4000_release,
398
399         .init = e4000_init,
400         .sleep = e4000_sleep,
401         .set_params = e4000_set_params,
402
403         .get_if_frequency = e4000_get_if_frequency,
404 };
405
406 struct dvb_frontend *e4000_attach(struct dvb_frontend *fe,
407                 struct i2c_adapter *i2c, const struct e4000_config *cfg)
408 {
409         struct e4000_priv *priv;
410         int ret;
411         u8 chip_id;
412
413         if (fe->ops.i2c_gate_ctrl)
414                 fe->ops.i2c_gate_ctrl(fe, 1);
415
416         priv = kzalloc(sizeof(struct e4000_priv), GFP_KERNEL);
417         if (!priv) {
418                 ret = -ENOMEM;
419                 dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
420                 goto err;
421         }
422
423         priv->cfg = cfg;
424         priv->i2c = i2c;
425
426         /* check if the tuner is there */
427         ret = e4000_rd_reg(priv, 0x02, &chip_id);
428         if (ret < 0)
429                 goto err;
430
431         dev_dbg(&priv->i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);
432
433         if (chip_id != 0x40)
434                 goto err;
435
436         /* put sleep as chip seems to be in normal mode by default */
437         ret = e4000_wr_reg(priv, 0x00, 0x00);
438         if (ret < 0)
439                 goto err;
440
441         dev_info(&priv->i2c->dev,
442                         "%s: Elonics E4000 successfully identified\n",
443                         KBUILD_MODNAME);
444
445         fe->tuner_priv = priv;
446         memcpy(&fe->ops.tuner_ops, &e4000_tuner_ops,
447                         sizeof(struct dvb_tuner_ops));
448
449         if (fe->ops.i2c_gate_ctrl)
450                 fe->ops.i2c_gate_ctrl(fe, 0);
451
452         return fe;
453 err:
454         if (fe->ops.i2c_gate_ctrl)
455                 fe->ops.i2c_gate_ctrl(fe, 0);
456
457         dev_dbg(&i2c->dev, "%s: failed=%d\n", __func__, ret);
458         kfree(priv);
459         return NULL;
460 }
461 EXPORT_SYMBOL(e4000_attach);
462
463 MODULE_DESCRIPTION("Elonics E4000 silicon tuner driver");
464 MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
465 MODULE_LICENSE("GPL");