xref: /openbmc/linux/drivers/media/tuners/mt2266.c (revision 86495af1)
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 = &reg, .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