1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Driver for Microtune MT2266 "Direct conversion low power broadband tuner"
4 *
5 * Copyright (c) 2007 Olivier DANET <odanet@caramail.com>
6 */
7
8 #include <linux/module.h>
9 #include <linux/delay.h>
10 #include <linux/dvb/frontend.h>
11 #include <linux/i2c.h>
12 #include <linux/slab.h>
13
14 #include <media/dvb_frontend.h>
15 #include "mt2266.h"
16
17 #define I2C_ADDRESS 0x60
18
19 #define REG_PART_REV 0
20 #define REG_TUNE 1
21 #define REG_BAND 6
22 #define REG_BANDWIDTH 8
23 #define REG_LOCK 0x12
24
25 #define PART_REV 0x85
26
27 struct mt2266_priv {
28 struct mt2266_config *cfg;
29 struct i2c_adapter *i2c;
30
31 u32 frequency;
32 u32 bandwidth;
33 u8 band;
34 };
35
36 #define MT2266_VHF 1
37 #define MT2266_UHF 0
38
39 /* Here, frequencies are expressed in kiloHertz to avoid 32 bits overflows */
40
41 static int debug;
42 module_param(debug, int, 0644);
43 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
44
45 #define dprintk(args...) do { if (debug) {printk(KERN_DEBUG "MT2266: " args); printk("\n"); }} while (0)
46
47 // Reads a single register
mt2266_readreg(struct mt2266_priv * priv,u8 reg,u8 * val)48 static int mt2266_readreg(struct mt2266_priv *priv, u8 reg, u8 *val)
49 {
50 struct i2c_msg msg[2] = {
51 { .addr = priv->cfg->i2c_address, .flags = 0, .buf = ®, .len = 1 },
52 { .addr = priv->cfg->i2c_address, .flags = I2C_M_RD, .buf = val, .len = 1 },
53 };
54 if (i2c_transfer(priv->i2c, msg, 2) != 2) {
55 printk(KERN_WARNING "MT2266 I2C read failed\n");
56 return -EREMOTEIO;
57 }
58 return 0;
59 }
60
61 // Writes a single register
mt2266_writereg(struct mt2266_priv * priv,u8 reg,u8 val)62 static int mt2266_writereg(struct mt2266_priv *priv, u8 reg, u8 val)
63 {
64 u8 buf[2] = { reg, val };
65 struct i2c_msg msg = {
66 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = 2
67 };
68 if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
69 printk(KERN_WARNING "MT2266 I2C write failed\n");
70 return -EREMOTEIO;
71 }
72 return 0;
73 }
74
75 // Writes a set of consecutive registers
mt2266_writeregs(struct mt2266_priv * priv,u8 * buf,u8 len)76 static int mt2266_writeregs(struct mt2266_priv *priv,u8 *buf, u8 len)
77 {
78 struct i2c_msg msg = {
79 .addr = priv->cfg->i2c_address, .flags = 0, .buf = buf, .len = len
80 };
81 if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
82 printk(KERN_WARNING "MT2266 I2C write failed (len=%i)\n",(int)len);
83 return -EREMOTEIO;
84 }
85 return 0;
86 }
87
88 // Initialisation sequences
89 static u8 mt2266_init1[] = { REG_TUNE, 0x00, 0x00, 0x28,
90 0x00, 0x52, 0x99, 0x3f };
91
92 static u8 mt2266_init2[] = {
93 0x17, 0x6d, 0x71, 0x61, 0xc0, 0xbf, 0xff, 0xdc, 0x00, 0x0a, 0xd4,
94 0x03, 0x64, 0x64, 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14,
95 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x7f, 0x5e, 0x3f, 0xff, 0xff,
96 0xff, 0x00, 0x77, 0x0f, 0x2d
97 };
98
99 static u8 mt2266_init_8mhz[] = { REG_BANDWIDTH, 0x22, 0x22, 0x22, 0x22,
100 0x22, 0x22, 0x22, 0x22 };
101
102 static u8 mt2266_init_7mhz[] = { REG_BANDWIDTH, 0x32, 0x32, 0x32, 0x32,
103 0x32, 0x32, 0x32, 0x32 };
104
105 static u8 mt2266_init_6mhz[] = { REG_BANDWIDTH, 0xa7, 0xa7, 0xa7, 0xa7,
106 0xa7, 0xa7, 0xa7, 0xa7 };
107
108 static u8 mt2266_uhf[] = { 0x1d, 0xdc, 0x00, 0x0a, 0xd4, 0x03, 0x64, 0x64,
109 0x64, 0x64, 0x22, 0xaa, 0xf2, 0x1e, 0x80, 0x14 };
110
111 static u8 mt2266_vhf[] = { 0x1d, 0xfe, 0x00, 0x00, 0xb4, 0x03, 0xa5, 0xa5,
112 0xa5, 0xa5, 0x82, 0xaa, 0xf1, 0x17, 0x80, 0x1f };
113
114 #define FREF 30000 // Quartz oscillator 30 MHz
115
mt2266_set_params(struct dvb_frontend * fe)116 static int mt2266_set_params(struct dvb_frontend *fe)
117 {
118 struct dtv_frontend_properties *c = &fe->dtv_property_cache;
119 struct mt2266_priv *priv;
120 int ret=0;
121 u32 freq;
122 u32 tune;
123 u8 lnaband;
124 u8 b[10];
125 int i;
126 u8 band;
127
128 priv = fe->tuner_priv;
129
130 freq = priv->frequency / 1000; /* Hz -> kHz */
131 if (freq < 470000 && freq > 230000)
132 return -EINVAL; /* Gap between VHF and UHF bands */
133
134 priv->frequency = c->frequency;
135 tune = 2 * freq * (8192/16) / (FREF/16);
136 band = (freq < 300000) ? MT2266_VHF : MT2266_UHF;
137 if (band == MT2266_VHF)
138 tune *= 2;
139
140 switch (c->bandwidth_hz) {
141 case 6000000:
142 mt2266_writeregs(priv, mt2266_init_6mhz,
143 sizeof(mt2266_init_6mhz));
144 break;
145 case 8000000:
146 mt2266_writeregs(priv, mt2266_init_8mhz,
147 sizeof(mt2266_init_8mhz));
148 break;
149 case 7000000:
150 default:
151 mt2266_writeregs(priv, mt2266_init_7mhz,
152 sizeof(mt2266_init_7mhz));
153 break;
154 }
155 priv->bandwidth = c->bandwidth_hz;
156
157 if (band == MT2266_VHF && priv->band == MT2266_UHF) {
158 dprintk("Switch from UHF to VHF");
159 mt2266_writereg(priv, 0x05, 0x04);
160 mt2266_writereg(priv, 0x19, 0x61);
161 mt2266_writeregs(priv, mt2266_vhf, sizeof(mt2266_vhf));
162 } else if (band == MT2266_UHF && priv->band == MT2266_VHF) {
163 dprintk("Switch from VHF to UHF");
164 mt2266_writereg(priv, 0x05, 0x52);
165 mt2266_writereg(priv, 0x19, 0x61);
166 mt2266_writeregs(priv, mt2266_uhf, sizeof(mt2266_uhf));
167 }
168 msleep(10);
169
170 if (freq <= 495000)
171 lnaband = 0xEE;
172 else if (freq <= 525000)
173 lnaband = 0xDD;
174 else if (freq <= 550000)
175 lnaband = 0xCC;
176 else if (freq <= 580000)
177 lnaband = 0xBB;
178 else if (freq <= 605000)
179 lnaband = 0xAA;
180 else if (freq <= 630000)
181 lnaband = 0x99;
182 else if (freq <= 655000)
183 lnaband = 0x88;
184 else if (freq <= 685000)
185 lnaband = 0x77;
186 else if (freq <= 710000)
187 lnaband = 0x66;
188 else if (freq <= 735000)
189 lnaband = 0x55;
190 else if (freq <= 765000)
191 lnaband = 0x44;
192 else if (freq <= 802000)
193 lnaband = 0x33;
194 else if (freq <= 840000)
195 lnaband = 0x22;
196 else
197 lnaband = 0x11;
198
199 b[0] = REG_TUNE;
200 b[1] = (tune >> 8) & 0x1F;
201 b[2] = tune & 0xFF;
202 b[3] = tune >> 13;
203 mt2266_writeregs(priv,b,4);
204
205 dprintk("set_parms: tune=%d band=%d %s",
206 (int) tune, (int) lnaband,
207 (band == MT2266_UHF) ? "UHF" : "VHF");
208 dprintk("set_parms: [1..3]: %2x %2x %2x",
209 (int) b[1], (int) b[2], (int)b[3]);
210
211 if (band == MT2266_UHF) {
212 b[0] = 0x05;
213 b[1] = (priv->band == MT2266_VHF) ? 0x52 : 0x62;
214 b[2] = lnaband;
215 mt2266_writeregs(priv, b, 3);
216 }
217
218 /* Wait for pll lock or timeout */
219 i = 0;
220 do {
221 mt2266_readreg(priv,REG_LOCK,b);
222 if (b[0] & 0x40)
223 break;
224 msleep(10);
225 i++;
226 } while (i<10);
227 dprintk("Lock when i=%i",(int)i);
228
229 if (band == MT2266_UHF && priv->band == MT2266_VHF)
230 mt2266_writereg(priv, 0x05, 0x62);
231
232 priv->band = band;
233
234 return ret;
235 }
236
mt2266_calibrate(struct mt2266_priv * priv)237 static void mt2266_calibrate(struct mt2266_priv *priv)
238 {
239 mt2266_writereg(priv, 0x11, 0x03);
240 mt2266_writereg(priv, 0x11, 0x01);
241 mt2266_writeregs(priv, mt2266_init1, sizeof(mt2266_init1));
242 mt2266_writeregs(priv, mt2266_init2, sizeof(mt2266_init2));
243 mt2266_writereg(priv, 0x33, 0x5e);
244 mt2266_writereg(priv, 0x10, 0x10);
245 mt2266_writereg(priv, 0x10, 0x00);
246 mt2266_writeregs(priv, mt2266_init_8mhz, sizeof(mt2266_init_8mhz));
247 msleep(25);
248 mt2266_writereg(priv, 0x17, 0x6d);
249 mt2266_writereg(priv, 0x1c, 0x00);
250 msleep(75);
251 mt2266_writereg(priv, 0x17, 0x6d);
252 mt2266_writereg(priv, 0x1c, 0xff);
253 }
254
mt2266_get_frequency(struct dvb_frontend * fe,u32 * frequency)255 static int mt2266_get_frequency(struct dvb_frontend *fe, u32 *frequency)
256 {
257 struct mt2266_priv *priv = fe->tuner_priv;
258 *frequency = priv->frequency;
259 return 0;
260 }
261
mt2266_get_bandwidth(struct dvb_frontend * fe,u32 * bandwidth)262 static int mt2266_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
263 {
264 struct mt2266_priv *priv = fe->tuner_priv;
265 *bandwidth = priv->bandwidth;
266 return 0;
267 }
268
mt2266_init(struct dvb_frontend * fe)269 static int mt2266_init(struct dvb_frontend *fe)
270 {
271 int ret;
272 struct mt2266_priv *priv = fe->tuner_priv;
273 ret = mt2266_writereg(priv, 0x17, 0x6d);
274 if (ret < 0)
275 return ret;
276 ret = mt2266_writereg(priv, 0x1c, 0xff);
277 if (ret < 0)
278 return ret;
279 return 0;
280 }
281
mt2266_sleep(struct dvb_frontend * fe)282 static int mt2266_sleep(struct dvb_frontend *fe)
283 {
284 struct mt2266_priv *priv = fe->tuner_priv;
285 mt2266_writereg(priv, 0x17, 0x6d);
286 mt2266_writereg(priv, 0x1c, 0x00);
287 return 0;
288 }
289
mt2266_release(struct dvb_frontend * fe)290 static void mt2266_release(struct dvb_frontend *fe)
291 {
292 kfree(fe->tuner_priv);
293 fe->tuner_priv = NULL;
294 }
295
296 static const struct dvb_tuner_ops mt2266_tuner_ops = {
297 .info = {
298 .name = "Microtune MT2266",
299 .frequency_min_hz = 174 * MHz,
300 .frequency_max_hz = 862 * MHz,
301 .frequency_step_hz = 50 * kHz,
302 },
303 .release = mt2266_release,
304 .init = mt2266_init,
305 .sleep = mt2266_sleep,
306 .set_params = mt2266_set_params,
307 .get_frequency = mt2266_get_frequency,
308 .get_bandwidth = mt2266_get_bandwidth
309 };
310
mt2266_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c,struct mt2266_config * cfg)311 struct dvb_frontend * mt2266_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c, struct mt2266_config *cfg)
312 {
313 struct mt2266_priv *priv = NULL;
314 u8 id = 0;
315
316 priv = kzalloc(sizeof(struct mt2266_priv), GFP_KERNEL);
317 if (priv == NULL)
318 return NULL;
319
320 priv->cfg = cfg;
321 priv->i2c = i2c;
322 priv->band = MT2266_UHF;
323
324 if (mt2266_readreg(priv, 0, &id)) {
325 kfree(priv);
326 return NULL;
327 }
328 if (id != PART_REV) {
329 kfree(priv);
330 return NULL;
331 }
332 printk(KERN_INFO "MT2266: successfully identified\n");
333 memcpy(&fe->ops.tuner_ops, &mt2266_tuner_ops, sizeof(struct dvb_tuner_ops));
334
335 fe->tuner_priv = priv;
336 mt2266_calibrate(priv);
337 return fe;
338 }
339 EXPORT_SYMBOL_GPL(mt2266_attach);
340
341 MODULE_AUTHOR("Olivier DANET");
342 MODULE_DESCRIPTION("Microtune MT2266 silicon tuner driver");
343 MODULE_LICENSE("GPL");
344