1 /*
2 * Driver for Microtune MT2131 "QAM/8VSB single chip tuner"
3 *
4 * Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
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/module.h>
23 #include <linux/delay.h>
24 #include <linux/dvb/frontend.h>
25 #include <linux/i2c.h>
26
27 #include "dvb_frontend.h"
28
29 #include "mt2131.h"
30 #include "mt2131_priv.h"
31
32 static int debug;
33 module_param(debug, int, 0644);
34 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
35
36 #define dprintk(level,fmt, arg...) if (debug >= level) \
37 printk(KERN_INFO "%s: " fmt, "mt2131", ## arg)
38
39 static u8 mt2131_config1[] = {
40 0x01,
41 0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88,
42 0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32,
43 0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80,
44 0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x00
45 };
46
47 static u8 mt2131_config2[] = {
48 0x10,
49 0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04
50 };
51
mt2131_readreg(struct mt2131_priv * priv,u8 reg,u8 * val)52 static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val)
53 {
54 struct i2c_msg msg[2] = {
55 { .addr = priv->cfg->i2c_address, .flags = 0,
56 .buf = ®, .len = 1 },
57 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
58 .buf = val, .len = 1 },
59 };
60
61 if (i2c_transfer(priv->i2c, msg, 2) != 2) {
62 printk(KERN_WARNING "mt2131 I2C read failed\n");
63 return -EREMOTEIO;
64 }
65 return 0;
66 }
67
mt2131_writereg(struct mt2131_priv * priv,u8 reg,u8 val)68 static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val)
69 {
70 u8 buf[2] = { reg, val };
71 struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0,
72 .buf = buf, .len = 2 };
73
74 if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
75 printk(KERN_WARNING "mt2131 I2C write failed\n");
76 return -EREMOTEIO;
77 }
78 return 0;
79 }
80
mt2131_writeregs(struct mt2131_priv * priv,u8 * buf,u8 len)81 static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len)
82 {
83 struct i2c_msg msg = { .addr = priv->cfg->i2c_address,
84 .flags = 0, .buf = buf, .len = len };
85
86 if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
87 printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n",
88 (int)len);
89 return -EREMOTEIO;
90 }
91 return 0;
92 }
93
mt2131_set_params(struct dvb_frontend * fe,struct dvb_frontend_parameters * params)94 static int mt2131_set_params(struct dvb_frontend *fe,
95 struct dvb_frontend_parameters *params)
96 {
97 struct mt2131_priv *priv;
98 int ret=0, i;
99 u32 freq;
100 u8 if_band_center;
101 u32 f_lo1, f_lo2;
102 u32 div1, num1, div2, num2;
103 u8 b[8];
104 u8 lockval = 0;
105
106 priv = fe->tuner_priv;
107 if (fe->ops.info.type == FE_OFDM)
108 priv->bandwidth = params->u.ofdm.bandwidth;
109 else
110 priv->bandwidth = 0;
111
112 freq = params->frequency / 1000; // Hz -> kHz
113 dprintk(1, "%s() freq=%d\n", __func__, freq);
114
115 f_lo1 = freq + MT2131_IF1 * 1000;
116 f_lo1 = (f_lo1 / 250) * 250;
117 f_lo2 = f_lo1 - freq - MT2131_IF2;
118
119 priv->frequency = (f_lo1 - f_lo2 - MT2131_IF2) * 1000;
120
121 /* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */
122 num1 = f_lo1 * 64 / (MT2131_FREF / 128);
123 div1 = num1 / 8192;
124 num1 &= 0x1fff;
125
126 /* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */
127 num2 = f_lo2 * 64 / (MT2131_FREF / 128);
128 div2 = num2 / 8192;
129 num2 &= 0x1fff;
130
131 if (freq <= 82500) if_band_center = 0x00; else
132 if (freq <= 137500) if_band_center = 0x01; else
133 if (freq <= 192500) if_band_center = 0x02; else
134 if (freq <= 247500) if_band_center = 0x03; else
135 if (freq <= 302500) if_band_center = 0x04; else
136 if (freq <= 357500) if_band_center = 0x05; else
137 if (freq <= 412500) if_band_center = 0x06; else
138 if (freq <= 467500) if_band_center = 0x07; else
139 if (freq <= 522500) if_band_center = 0x08; else
140 if (freq <= 577500) if_band_center = 0x09; else
141 if (freq <= 632500) if_band_center = 0x0A; else
142 if (freq <= 687500) if_band_center = 0x0B; else
143 if (freq <= 742500) if_band_center = 0x0C; else
144 if (freq <= 797500) if_band_center = 0x0D; else
145 if (freq <= 852500) if_band_center = 0x0E; else
146 if (freq <= 907500) if_band_center = 0x0F; else
147 if (freq <= 962500) if_band_center = 0x10; else
148 if (freq <= 1017500) if_band_center = 0x11; else
149 if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13;
150
151 b[0] = 1;
152 b[1] = (num1 >> 5) & 0xFF;
153 b[2] = (num1 & 0x1F);
154 b[3] = div1;
155 b[4] = (num2 >> 5) & 0xFF;
156 b[5] = num2 & 0x1F;
157 b[6] = div2;
158
159 dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2);
160 dprintk(1, "PLL freq=%dkHz band=%d\n", (int)freq, (int)if_band_center);
161 dprintk(1, "PLL f_lo1=%dkHz f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2);
162 dprintk(1, "PLL div1=%d num1=%d div2=%d num2=%d\n",
163 (int)div1, (int)num1, (int)div2, (int)num2);
164 dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n",
165 (int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5],
166 (int)b[6]);
167
168 ret = mt2131_writeregs(priv,b,7);
169 if (ret < 0)
170 return ret;
171
172 mt2131_writereg(priv, 0x0b, if_band_center);
173
174 /* Wait for lock */
175 i = 0;
176 do {
177 mt2131_readreg(priv, 0x08, &lockval);
178 if ((lockval & 0x88) == 0x88)
179 break;
180 msleep(4);
181 i++;
182 } while (i < 10);
183
184 return ret;
185 }
186
mt2131_get_frequency(struct dvb_frontend * fe,u32 * frequency)187 static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency)
188 {
189 struct mt2131_priv *priv = fe->tuner_priv;
190 dprintk(1, "%s()\n", __func__);
191 *frequency = priv->frequency;
192 return 0;
193 }
194
mt2131_get_bandwidth(struct dvb_frontend * fe,u32 * bandwidth)195 static int mt2131_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
196 {
197 struct mt2131_priv *priv = fe->tuner_priv;
198 dprintk(1, "%s()\n", __func__);
199 *bandwidth = priv->bandwidth;
200 return 0;
201 }
202
mt2131_get_status(struct dvb_frontend * fe,u32 * status)203 static int mt2131_get_status(struct dvb_frontend *fe, u32 *status)
204 {
205 struct mt2131_priv *priv = fe->tuner_priv;
206 u8 lock_status = 0;
207 u8 afc_status = 0;
208
209 *status = 0;
210
211 mt2131_readreg(priv, 0x08, &lock_status);
212 if ((lock_status & 0x88) == 0x88)
213 *status = TUNER_STATUS_LOCKED;
214
215 mt2131_readreg(priv, 0x09, &afc_status);
216 dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n",
217 __func__, lock_status, afc_status);
218
219 return 0;
220 }
221
mt2131_init(struct dvb_frontend * fe)222 static int mt2131_init(struct dvb_frontend *fe)
223 {
224 struct mt2131_priv *priv = fe->tuner_priv;
225 int ret;
226 dprintk(1, "%s()\n", __func__);
227
228 if ((ret = mt2131_writeregs(priv, mt2131_config1,
229 sizeof(mt2131_config1))) < 0)
230 return ret;
231
232 mt2131_writereg(priv, 0x0b, 0x09);
233 mt2131_writereg(priv, 0x15, 0x47);
234 mt2131_writereg(priv, 0x07, 0xf2);
235 mt2131_writereg(priv, 0x0b, 0x01);
236
237 if ((ret = mt2131_writeregs(priv, mt2131_config2,
238 sizeof(mt2131_config2))) < 0)
239 return ret;
240
241 return ret;
242 }
243
mt2131_release(struct dvb_frontend * fe)244 static int mt2131_release(struct dvb_frontend *fe)
245 {
246 dprintk(1, "%s()\n", __func__);
247 kfree(fe->tuner_priv);
248 fe->tuner_priv = NULL;
249 return 0;
250 }
251
252 static const struct dvb_tuner_ops mt2131_tuner_ops = {
253 .info = {
254 .name = "Microtune MT2131",
255 .frequency_min = 48000000,
256 .frequency_max = 860000000,
257 .frequency_step = 50000,
258 },
259
260 .release = mt2131_release,
261 .init = mt2131_init,
262
263 .set_params = mt2131_set_params,
264 .get_frequency = mt2131_get_frequency,
265 .get_bandwidth = mt2131_get_bandwidth,
266 .get_status = mt2131_get_status
267 };
268
mt2131_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c,struct mt2131_config * cfg,u16 if1)269 struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,
270 struct i2c_adapter *i2c,
271 struct mt2131_config *cfg, u16 if1)
272 {
273 struct mt2131_priv *priv = NULL;
274 u8 id = 0;
275
276 dprintk(1, "%s()\n", __func__);
277
278 priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL);
279 if (priv == NULL)
280 return NULL;
281
282 priv->cfg = cfg;
283 priv->bandwidth = 6000000; /* 6MHz */
284 priv->i2c = i2c;
285
286 if (mt2131_readreg(priv, 0, &id) != 0) {
287 kfree(priv);
288 return NULL;
289 }
290 if ( (id != 0x3E) && (id != 0x3F) ) {
291 printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n",
292 cfg->i2c_address);
293 kfree(priv);
294 return NULL;
295 }
296
297 printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n",
298 cfg->i2c_address);
299 memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,
300 sizeof(struct dvb_tuner_ops));
301
302 fe->tuner_priv = priv;
303 return fe;
304 }
305 EXPORT_SYMBOL(mt2131_attach);
306
307 MODULE_AUTHOR("Steven Toth");
308 MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");
309 MODULE_LICENSE("GPL");
310
311 /*
312 * Local variables:
313 * c-basic-offset: 8
314 */
315