xref: /openbmc/linux/drivers/media/tuners/mt2131.c (revision 86495af1)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Driver for Microtune MT2131 "QAM/8VSB single chip tuner"
4  *
5  *  Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
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 
16 #include "mt2131.h"
17 #include "mt2131_priv.h"
18 
19 static int debug;
20 module_param(debug, int, 0644);
21 MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
22 
23 #define dprintk(level,fmt, arg...) if (debug >= level) \
24 	printk(KERN_INFO "%s: " fmt, "mt2131", ## arg)
25 
26 static u8 mt2131_config1[] = {
27 	0x01,
28 	0x50, 0x00, 0x50, 0x80, 0x00, 0x49, 0xfa, 0x88,
29 	0x08, 0x77, 0x41, 0x04, 0x00, 0x00, 0x00, 0x32,
30 	0x7f, 0xda, 0x4c, 0x00, 0x10, 0xaa, 0x78, 0x80,
31 	0xff, 0x68, 0xa0, 0xff, 0xdd, 0x00, 0x00
32 };
33 
34 static u8 mt2131_config2[] = {
35 	0x10,
36 	0x7f, 0xc8, 0x0a, 0x5f, 0x00, 0x04
37 };
38 
mt2131_readreg(struct mt2131_priv * priv,u8 reg,u8 * val)39 static int mt2131_readreg(struct mt2131_priv *priv, u8 reg, u8 *val)
40 {
41 	struct i2c_msg msg[2] = {
42 		{ .addr = priv->cfg->i2c_address, .flags = 0,
43 		  .buf = &reg, .len = 1 },
44 		{ .addr = priv->cfg->i2c_address, .flags = I2C_M_RD,
45 		  .buf = val,  .len = 1 },
46 	};
47 
48 	if (i2c_transfer(priv->i2c, msg, 2) != 2) {
49 		printk(KERN_WARNING "mt2131 I2C read failed\n");
50 		return -EREMOTEIO;
51 	}
52 	return 0;
53 }
54 
mt2131_writereg(struct mt2131_priv * priv,u8 reg,u8 val)55 static int mt2131_writereg(struct mt2131_priv *priv, u8 reg, u8 val)
56 {
57 	u8 buf[2] = { reg, val };
58 	struct i2c_msg msg = { .addr = priv->cfg->i2c_address, .flags = 0,
59 			       .buf = buf, .len = 2 };
60 
61 	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
62 		printk(KERN_WARNING "mt2131 I2C write failed\n");
63 		return -EREMOTEIO;
64 	}
65 	return 0;
66 }
67 
mt2131_writeregs(struct mt2131_priv * priv,u8 * buf,u8 len)68 static int mt2131_writeregs(struct mt2131_priv *priv,u8 *buf, u8 len)
69 {
70 	struct i2c_msg msg = { .addr = priv->cfg->i2c_address,
71 			       .flags = 0, .buf = buf, .len = len };
72 
73 	if (i2c_transfer(priv->i2c, &msg, 1) != 1) {
74 		printk(KERN_WARNING "mt2131 I2C write failed (len=%i)\n",
75 		       (int)len);
76 		return -EREMOTEIO;
77 	}
78 	return 0;
79 }
80 
mt2131_set_params(struct dvb_frontend * fe)81 static int mt2131_set_params(struct dvb_frontend *fe)
82 {
83 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
84 	struct mt2131_priv *priv;
85 	int ret=0, i;
86 	u32 freq;
87 	u8  if_band_center;
88 	u32 f_lo1, f_lo2;
89 	u32 div1, num1, div2, num2;
90 	u8  b[8];
91 	u8 lockval = 0;
92 
93 	priv = fe->tuner_priv;
94 
95 	freq = c->frequency / 1000;  /* Hz -> kHz */
96 	dprintk(1, "%s() freq=%d\n", __func__, freq);
97 
98 	f_lo1 = freq + MT2131_IF1 * 1000;
99 	f_lo1 = (f_lo1 / 250) * 250;
100 	f_lo2 = f_lo1 - freq - MT2131_IF2;
101 
102 	priv->frequency =  (f_lo1 - f_lo2 - MT2131_IF2) * 1000;
103 
104 	/* Frequency LO1 = 16MHz * (DIV1 + NUM1/8192 ) */
105 	num1 = f_lo1 * 64 / (MT2131_FREF / 128);
106 	div1 = num1 / 8192;
107 	num1 &= 0x1fff;
108 
109 	/* Frequency LO2 = 16MHz * (DIV2 + NUM2/8192 ) */
110 	num2 = f_lo2 * 64 / (MT2131_FREF / 128);
111 	div2 = num2 / 8192;
112 	num2 &= 0x1fff;
113 
114 	if (freq <=   82500) if_band_center = 0x00; else
115 	if (freq <=  137500) if_band_center = 0x01; else
116 	if (freq <=  192500) if_band_center = 0x02; else
117 	if (freq <=  247500) if_band_center = 0x03; else
118 	if (freq <=  302500) if_band_center = 0x04; else
119 	if (freq <=  357500) if_band_center = 0x05; else
120 	if (freq <=  412500) if_band_center = 0x06; else
121 	if (freq <=  467500) if_band_center = 0x07; else
122 	if (freq <=  522500) if_band_center = 0x08; else
123 	if (freq <=  577500) if_band_center = 0x09; else
124 	if (freq <=  632500) if_band_center = 0x0A; else
125 	if (freq <=  687500) if_band_center = 0x0B; else
126 	if (freq <=  742500) if_band_center = 0x0C; else
127 	if (freq <=  797500) if_band_center = 0x0D; else
128 	if (freq <=  852500) if_band_center = 0x0E; else
129 	if (freq <=  907500) if_band_center = 0x0F; else
130 	if (freq <=  962500) if_band_center = 0x10; else
131 	if (freq <= 1017500) if_band_center = 0x11; else
132 	if (freq <= 1072500) if_band_center = 0x12; else if_band_center = 0x13;
133 
134 	b[0] = 1;
135 	b[1] = (num1 >> 5) & 0xFF;
136 	b[2] = (num1 & 0x1F);
137 	b[3] = div1;
138 	b[4] = (num2 >> 5) & 0xFF;
139 	b[5] = num2 & 0x1F;
140 	b[6] = div2;
141 
142 	dprintk(1, "IF1: %dMHz IF2: %dMHz\n", MT2131_IF1, MT2131_IF2);
143 	dprintk(1, "PLL freq=%dkHz  band=%d\n", (int)freq, (int)if_band_center);
144 	dprintk(1, "PLL f_lo1=%dkHz  f_lo2=%dkHz\n", (int)f_lo1, (int)f_lo2);
145 	dprintk(1, "PLL div1=%d  num1=%d  div2=%d  num2=%d\n",
146 		(int)div1, (int)num1, (int)div2, (int)num2);
147 	dprintk(1, "PLL [1..6]: %2x %2x %2x %2x %2x %2x\n",
148 		(int)b[1], (int)b[2], (int)b[3], (int)b[4], (int)b[5],
149 		(int)b[6]);
150 
151 	ret = mt2131_writeregs(priv,b,7);
152 	if (ret < 0)
153 		return ret;
154 
155 	mt2131_writereg(priv, 0x0b, if_band_center);
156 
157 	/* Wait for lock */
158 	i = 0;
159 	do {
160 		mt2131_readreg(priv, 0x08, &lockval);
161 		if ((lockval & 0x88) == 0x88)
162 			break;
163 		msleep(4);
164 		i++;
165 	} while (i < 10);
166 
167 	return ret;
168 }
169 
mt2131_get_frequency(struct dvb_frontend * fe,u32 * frequency)170 static int mt2131_get_frequency(struct dvb_frontend *fe, u32 *frequency)
171 {
172 	struct mt2131_priv *priv = fe->tuner_priv;
173 	dprintk(1, "%s()\n", __func__);
174 	*frequency = priv->frequency;
175 	return 0;
176 }
177 
mt2131_get_status(struct dvb_frontend * fe,u32 * status)178 static int mt2131_get_status(struct dvb_frontend *fe, u32 *status)
179 {
180 	struct mt2131_priv *priv = fe->tuner_priv;
181 	u8 lock_status = 0;
182 	u8 afc_status = 0;
183 
184 	*status = 0;
185 
186 	mt2131_readreg(priv, 0x08, &lock_status);
187 	if ((lock_status & 0x88) == 0x88)
188 		*status = TUNER_STATUS_LOCKED;
189 
190 	mt2131_readreg(priv, 0x09, &afc_status);
191 	dprintk(1, "%s() - LO Status = 0x%x, AFC Status = 0x%x\n",
192 		__func__, lock_status, afc_status);
193 
194 	return 0;
195 }
196 
mt2131_init(struct dvb_frontend * fe)197 static int mt2131_init(struct dvb_frontend *fe)
198 {
199 	struct mt2131_priv *priv = fe->tuner_priv;
200 	int ret;
201 	dprintk(1, "%s()\n", __func__);
202 
203 	if ((ret = mt2131_writeregs(priv, mt2131_config1,
204 				    sizeof(mt2131_config1))) < 0)
205 		return ret;
206 
207 	mt2131_writereg(priv, 0x0b, 0x09);
208 	mt2131_writereg(priv, 0x15, 0x47);
209 	mt2131_writereg(priv, 0x07, 0xf2);
210 	mt2131_writereg(priv, 0x0b, 0x01);
211 
212 	if ((ret = mt2131_writeregs(priv, mt2131_config2,
213 				    sizeof(mt2131_config2))) < 0)
214 		return ret;
215 
216 	return ret;
217 }
218 
mt2131_release(struct dvb_frontend * fe)219 static void mt2131_release(struct dvb_frontend *fe)
220 {
221 	dprintk(1, "%s()\n", __func__);
222 	kfree(fe->tuner_priv);
223 	fe->tuner_priv = NULL;
224 }
225 
226 static const struct dvb_tuner_ops mt2131_tuner_ops = {
227 	.info = {
228 		.name              = "Microtune MT2131",
229 		.frequency_min_hz  =  48 * MHz,
230 		.frequency_max_hz  = 860 * MHz,
231 		.frequency_step_hz =  50 * kHz,
232 	},
233 
234 	.release       = mt2131_release,
235 	.init          = mt2131_init,
236 
237 	.set_params    = mt2131_set_params,
238 	.get_frequency = mt2131_get_frequency,
239 	.get_status    = mt2131_get_status
240 };
241 
mt2131_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c,struct mt2131_config * cfg,u16 if1)242 struct dvb_frontend * mt2131_attach(struct dvb_frontend *fe,
243 				    struct i2c_adapter *i2c,
244 				    struct mt2131_config *cfg, u16 if1)
245 {
246 	struct mt2131_priv *priv = NULL;
247 	u8 id = 0;
248 
249 	dprintk(1, "%s()\n", __func__);
250 
251 	priv = kzalloc(sizeof(struct mt2131_priv), GFP_KERNEL);
252 	if (priv == NULL)
253 		return NULL;
254 
255 	priv->cfg = cfg;
256 	priv->i2c = i2c;
257 
258 	if (mt2131_readreg(priv, 0, &id) != 0) {
259 		kfree(priv);
260 		return NULL;
261 	}
262 	if ( (id != 0x3E) && (id != 0x3F) ) {
263 		printk(KERN_ERR "MT2131: Device not found at addr 0x%02x\n",
264 		       cfg->i2c_address);
265 		kfree(priv);
266 		return NULL;
267 	}
268 
269 	printk(KERN_INFO "MT2131: successfully identified at address 0x%02x\n",
270 	       cfg->i2c_address);
271 	memcpy(&fe->ops.tuner_ops, &mt2131_tuner_ops,
272 	       sizeof(struct dvb_tuner_ops));
273 
274 	fe->tuner_priv = priv;
275 	return fe;
276 }
277 EXPORT_SYMBOL_GPL(mt2131_attach);
278 
279 MODULE_AUTHOR("Steven Toth");
280 MODULE_DESCRIPTION("Microtune MT2131 silicon tuner driver");
281 MODULE_LICENSE("GPL");
282