1 /*
2 * For Philips TEA5761 FM Chip
3 * I2C address is allways 0x20 (0x10 at 7-bit mode).
4 *
5 * Copyright (c) 2005-2007 Mauro Carvalho Chehab (mchehab@infradead.org)
6 * This code is placed under the terms of the GNUv2 General Public License
7 *
8 */
9
10 #include <linux/i2c.h>
11 #include <linux/delay.h>
12 #include <linux/videodev.h>
13 #include <media/tuner.h>
14 #include "tuner-i2c.h"
15 #include "tea5761.h"
16
17 static int debug = 0;
18 module_param(debug, int, 0644);
19 MODULE_PARM_DESC(debug, "enable verbose debug messages");
20
21 #define PREFIX "tea5761"
22
23 struct tea5761_priv {
24 struct tuner_i2c_props i2c_props;
25
26 u32 frequency;
27 };
28
29 /*****************************************************************************/
30
31 /***************************
32 * TEA5761HN I2C registers *
33 ***************************/
34
35 /* INTREG - Read: bytes 0 and 1 / Write: byte 0 */
36
37 /* first byte for reading */
38 #define TEA5761_INTREG_IFFLAG 0x10
39 #define TEA5761_INTREG_LEVFLAG 0x8
40 #define TEA5761_INTREG_FRRFLAG 0x2
41 #define TEA5761_INTREG_BLFLAG 0x1
42
43 /* second byte for reading / byte for writing */
44 #define TEA5761_INTREG_IFMSK 0x10
45 #define TEA5761_INTREG_LEVMSK 0x8
46 #define TEA5761_INTREG_FRMSK 0x2
47 #define TEA5761_INTREG_BLMSK 0x1
48
49 /* FRQSET - Read: bytes 2 and 3 / Write: byte 1 and 2 */
50
51 /* First byte */
52 #define TEA5761_FRQSET_SEARCH_UP 0x80 /* 1=Station search from botton to up */
53 #define TEA5761_FRQSET_SEARCH_MODE 0x40 /* 1=Search mode */
54
55 /* Bits 0-5 for divider MSB */
56
57 /* Second byte */
58 /* Bits 0-7 for divider LSB */
59
60 /* TNCTRL - Read: bytes 4 and 5 / Write: Bytes 3 and 4 */
61
62 /* first byte */
63
64 #define TEA5761_TNCTRL_PUPD_0 0x40 /* Power UP/Power Down MSB */
65 #define TEA5761_TNCTRL_BLIM 0X20 /* 1= Japan Frequencies, 0= European frequencies */
66 #define TEA5761_TNCTRL_SWPM 0x10 /* 1= software port is FRRFLAG */
67 #define TEA5761_TNCTRL_IFCTC 0x08 /* 1= IF count time 15.02 ms, 0= IF count time 2.02 ms */
68 #define TEA5761_TNCTRL_AFM 0x04
69 #define TEA5761_TNCTRL_SMUTE 0x02 /* 1= Soft mute */
70 #define TEA5761_TNCTRL_SNC 0x01
71
72 /* second byte */
73
74 #define TEA5761_TNCTRL_MU 0x80 /* 1=Hard mute */
75 #define TEA5761_TNCTRL_SSL_1 0x40
76 #define TEA5761_TNCTRL_SSL_0 0x20
77 #define TEA5761_TNCTRL_HLSI 0x10
78 #define TEA5761_TNCTRL_MST 0x08 /* 1 = mono */
79 #define TEA5761_TNCTRL_SWP 0x04
80 #define TEA5761_TNCTRL_DTC 0x02 /* 1 = deemphasis 50 us, 0 = deemphasis 75 us */
81 #define TEA5761_TNCTRL_AHLSI 0x01
82
83 /* FRQCHECK - Read: bytes 6 and 7 */
84 /* First byte */
85
86 /* Bits 0-5 for divider MSB */
87
88 /* Second byte */
89 /* Bits 0-7 for divider LSB */
90
91 /* TUNCHECK - Read: bytes 8 and 9 */
92
93 /* First byte */
94 #define TEA5761_TUNCHECK_IF_MASK 0x7e /* IF count */
95 #define TEA5761_TUNCHECK_TUNTO 0x01
96
97 /* Second byte */
98 #define TEA5761_TUNCHECK_LEV_MASK 0xf0 /* Level Count */
99 #define TEA5761_TUNCHECK_LD 0x08
100 #define TEA5761_TUNCHECK_STEREO 0x04
101
102 /* TESTREG - Read: bytes 10 and 11 / Write: bytes 5 and 6 */
103
104 /* All zero = no test mode */
105
106 /* MANID - Read: bytes 12 and 13 */
107
108 /* First byte - should be 0x10 */
109 #define TEA5767_MANID_VERSION_MASK 0xf0 /* Version = 1 */
110 #define TEA5767_MANID_ID_MSB_MASK 0x0f /* Manufacurer ID - should be 0 */
111
112 /* Second byte - Should be 0x2b */
113
114 #define TEA5767_MANID_ID_LSB_MASK 0xfe /* Manufacturer ID - should be 0x15 */
115 #define TEA5767_MANID_IDAV 0x01 /* 1 = Chip has ID, 0 = Chip has no ID */
116
117 /* Chip ID - Read: bytes 14 and 15 */
118
119 /* First byte - should be 0x57 */
120
121 /* Second byte - should be 0x61 */
122
123 /*****************************************************************************/
124
125 #define FREQ_OFFSET 0 /* for TEA5767, it is 700 to give the right freq */
126 static void tea5761_status_dump(unsigned char *buffer)
127 {
128 unsigned int div, frq;
129
130 div = ((buffer[2] & 0x3f) << 8) | buffer[3];
131
132 frq = 1000 * (div * 32768 / 1000 + FREQ_OFFSET + 225) / 4; /* Freq in KHz */
133
134 printk(PREFIX "Frequency %d.%03d KHz (divider = 0x%04x)\n",
135 frq / 1000, frq % 1000, div);
136 }
137
138 /* Freq should be specifyed at 62.5 Hz */
139 static int set_radio_freq(struct dvb_frontend *fe,
140 struct analog_parameters *params)
141 {
142 struct tea5761_priv *priv = fe->tuner_priv;
143 unsigned int frq = params->frequency;
144 unsigned char buffer[7] = {0, 0, 0, 0, 0, 0, 0 };
145 unsigned div;
146 int rc;
147
148 tuner_dbg("radio freq counter %d\n", frq);
149
150 if (params->mode == T_STANDBY) {
151 tuner_dbg("TEA5761 set to standby mode\n");
152 buffer[5] |= TEA5761_TNCTRL_MU;
153 } else {
154 buffer[4] |= TEA5761_TNCTRL_PUPD_0;
155 }
156
157
158 if (params->audmode == V4L2_TUNER_MODE_MONO) {
159 tuner_dbg("TEA5761 set to mono\n");
160 buffer[5] |= TEA5761_TNCTRL_MST;
161 } else {
162 tuner_dbg("TEA5761 set to stereo\n");
163 }
164
165 div = (1000 * (frq * 4 / 16 + 700 + 225) ) >> 15;
166 buffer[1] = (div >> 8) & 0x3f;
167 buffer[2] = div & 0xff;
168
169 if (debug)
170 tea5761_status_dump(buffer);
171
172 if (7 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 7)))
173 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
174
175 priv->frequency = frq * 125 / 2;
176
177 return 0;
178 }
179
180 static int tea5761_read_status(struct dvb_frontend *fe, char *buffer)
181 {
182 struct tea5761_priv *priv = fe->tuner_priv;
183 int rc;
184
185 memset(buffer, 0, 16);
186 if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {
187 tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc);
188 return -EREMOTEIO;
189 }
190
191 return 0;
192 }
193
194 static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer)
195 {
196 struct tea5761_priv *priv = fe->tuner_priv;
197
198 int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
199
200 tuner_dbg("Signal strength: %d\n", signal);
201
202 return signal;
203 }
204
205 static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer)
206 {
207 struct tea5761_priv *priv = fe->tuner_priv;
208
209 int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;
210
211 tuner_dbg("Radio ST GET = %02x\n", stereo);
212
213 return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
214 }
215
216 static int tea5761_get_status(struct dvb_frontend *fe, u32 *status)
217 {
218 unsigned char buffer[16];
219
220 *status = 0;
221
222 if (0 == tea5761_read_status(fe, buffer)) {
223 if (tea5761_signal(fe, buffer))
224 *status = TUNER_STATUS_LOCKED;
225 if (tea5761_stereo(fe, buffer))
226 *status |= TUNER_STATUS_STEREO;
227 }
228
229 return 0;
230 }
231
232 static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
233 {
234 unsigned char buffer[16];
235
236 *strength = 0;
237
238 if (0 == tea5761_read_status(fe, buffer))
239 *strength = tea5761_signal(fe, buffer);
240
241 return 0;
242 }
243
244 int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
245 {
246 unsigned char buffer[16];
247 int rc;
248 struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
249
250 if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) {
251 printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc);
252 return -EINVAL;
253 }
254
255 if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) {
256 printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x."
257 " It is not a TEA5761\n",
258 buffer[13], buffer[14], buffer[15]);
259 return -EINVAL;
260 }
261 printk(KERN_WARNING "tea5761: TEA%02x%02x detected. "
262 "Manufacturer ID= 0x%02x\n",
263 buffer[14], buffer[15], buffer[13]);
264
265 return 0;
266 }
267
268 static int tea5761_release(struct dvb_frontend *fe)
269 {
270 kfree(fe->tuner_priv);
271 fe->tuner_priv = NULL;
272
273 return 0;
274 }
275
276 static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
277 {
278 struct tea5761_priv *priv = fe->tuner_priv;
279 *frequency = priv->frequency;
280 return 0;
281 }
282
283 static struct dvb_tuner_ops tea5761_tuner_ops = {
284 .info = {
285 .name = "tea5761", // Philips TEA5761HN FM Radio
286 },
287 .set_analog_params = set_radio_freq,
288 .release = tea5761_release,
289 .get_frequency = tea5761_get_frequency,
290 .get_status = tea5761_get_status,
291 .get_rf_strength = tea5761_get_rf_strength,
292 };
293
294 struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe,
295 struct i2c_adapter* i2c_adap,
296 u8 i2c_addr)
297 {
298 struct tea5761_priv *priv = NULL;
299
300 if (tea5761_autodetection(i2c_adap, i2c_addr) == EINVAL)
301 return NULL;
302
303 priv = kzalloc(sizeof(struct tea5761_priv), GFP_KERNEL);
304 if (priv == NULL)
305 return NULL;
306 fe->tuner_priv = priv;
307
308 priv->i2c_props.addr = i2c_addr;
309 priv->i2c_props.adap = i2c_adap;
310
311 memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops,
312 sizeof(struct dvb_tuner_ops));
313
314 tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio");
315
316 return fe;
317 }
318
319
320 EXPORT_SYMBOL_GPL(tea5761_attach);
321 EXPORT_SYMBOL_GPL(tea5761_autodetection);
322
323 MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
324 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
325 MODULE_LICENSE("GPL");
326
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