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/slab.h>
12 #include <linux/delay.h>
13 #include <linux/videodev2.h>
14 #include <media/tuner.h>
15 #include "tuner-i2c.h"
16 #include "tea5761.h"
17
18 static int debug;
19 module_param(debug, int, 0644);
20 MODULE_PARM_DESC(debug, "enable verbose debug messages");
21
22 struct tea5761_priv {
23 struct tuner_i2c_props i2c_props;
24
25 u32 frequency;
26 bool standby;
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 */
tea5761_status_dump(unsigned char * buffer)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(KERN_INFO "tea5761: 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 */
__set_radio_freq(struct dvb_frontend * fe,unsigned int freq,bool mono)139 static int __set_radio_freq(struct dvb_frontend *fe,
140 unsigned int freq,
141 bool mono)
142 {
143 struct tea5761_priv *priv = fe->tuner_priv;
144 unsigned int frq = freq;
145 unsigned char buffer[7] = {0, 0, 0, 0, 0, 0, 0 };
146 unsigned div;
147 int rc;
148
149 tuner_dbg("radio freq counter %d\n", frq);
150
151 if (priv->standby) {
152 tuner_dbg("TEA5761 set to standby mode\n");
153 buffer[5] |= TEA5761_TNCTRL_MU;
154 } else {
155 buffer[4] |= TEA5761_TNCTRL_PUPD_0;
156 }
157
158
159 if (mono) {
160 tuner_dbg("TEA5761 set to mono\n");
161 buffer[5] |= TEA5761_TNCTRL_MST;
162 } else {
163 tuner_dbg("TEA5761 set to stereo\n");
164 }
165
166 div = (1000 * (frq * 4 / 16 + 700 + 225) ) >> 15;
167 buffer[1] = (div >> 8) & 0x3f;
168 buffer[2] = div & 0xff;
169
170 if (debug)
171 tea5761_status_dump(buffer);
172
173 if (7 != (rc = tuner_i2c_xfer_send(&priv->i2c_props, buffer, 7)))
174 tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
175
176 priv->frequency = frq * 125 / 2;
177
178 return 0;
179 }
180
set_radio_freq(struct dvb_frontend * fe,struct analog_parameters * params)181 static int set_radio_freq(struct dvb_frontend *fe,
182 struct analog_parameters *params)
183 {
184 struct tea5761_priv *priv = fe->analog_demod_priv;
185
186 priv->standby = false;
187
188 return __set_radio_freq(fe, params->frequency,
189 params->audmode == V4L2_TUNER_MODE_MONO);
190 }
191
set_radio_sleep(struct dvb_frontend * fe)192 static int set_radio_sleep(struct dvb_frontend *fe)
193 {
194 struct tea5761_priv *priv = fe->analog_demod_priv;
195
196 priv->standby = true;
197
198 return __set_radio_freq(fe, priv->frequency, false);
199 }
200
tea5761_read_status(struct dvb_frontend * fe,char * buffer)201 static int tea5761_read_status(struct dvb_frontend *fe, char *buffer)
202 {
203 struct tea5761_priv *priv = fe->tuner_priv;
204 int rc;
205
206 memset(buffer, 0, 16);
207 if (16 != (rc = tuner_i2c_xfer_recv(&priv->i2c_props, buffer, 16))) {
208 tuner_warn("i2c i/o error: rc == %d (should be 16)\n", rc);
209 return -EREMOTEIO;
210 }
211
212 return 0;
213 }
214
tea5761_signal(struct dvb_frontend * fe,const char * buffer)215 static inline int tea5761_signal(struct dvb_frontend *fe, const char *buffer)
216 {
217 struct tea5761_priv *priv = fe->tuner_priv;
218
219 int signal = ((buffer[9] & TEA5761_TUNCHECK_LEV_MASK) << (13 - 4));
220
221 tuner_dbg("Signal strength: %d\n", signal);
222
223 return signal;
224 }
225
tea5761_stereo(struct dvb_frontend * fe,const char * buffer)226 static inline int tea5761_stereo(struct dvb_frontend *fe, const char *buffer)
227 {
228 struct tea5761_priv *priv = fe->tuner_priv;
229
230 int stereo = buffer[9] & TEA5761_TUNCHECK_STEREO;
231
232 tuner_dbg("Radio ST GET = %02x\n", stereo);
233
234 return (stereo ? V4L2_TUNER_SUB_STEREO : 0);
235 }
236
tea5761_get_status(struct dvb_frontend * fe,u32 * status)237 static int tea5761_get_status(struct dvb_frontend *fe, u32 *status)
238 {
239 unsigned char buffer[16];
240
241 *status = 0;
242
243 if (0 == tea5761_read_status(fe, buffer)) {
244 if (tea5761_signal(fe, buffer))
245 *status = TUNER_STATUS_LOCKED;
246 if (tea5761_stereo(fe, buffer))
247 *status |= TUNER_STATUS_STEREO;
248 }
249
250 return 0;
251 }
252
tea5761_get_rf_strength(struct dvb_frontend * fe,u16 * strength)253 static int tea5761_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
254 {
255 unsigned char buffer[16];
256
257 *strength = 0;
258
259 if (0 == tea5761_read_status(fe, buffer))
260 *strength = tea5761_signal(fe, buffer);
261
262 return 0;
263 }
264
tea5761_autodetection(struct i2c_adapter * i2c_adap,u8 i2c_addr)265 int tea5761_autodetection(struct i2c_adapter* i2c_adap, u8 i2c_addr)
266 {
267 unsigned char buffer[16];
268 int rc;
269 struct tuner_i2c_props i2c = { .adap = i2c_adap, .addr = i2c_addr };
270
271 if (16 != (rc = tuner_i2c_xfer_recv(&i2c, buffer, 16))) {
272 printk(KERN_WARNING "it is not a TEA5761. Received %i chars.\n", rc);
273 return -EINVAL;
274 }
275
276 if ((buffer[13] != 0x2b) || (buffer[14] != 0x57) || (buffer[15] != 0x061)) {
277 printk(KERN_WARNING "Manufacturer ID= 0x%02x, Chip ID = %02x%02x."
278 " It is not a TEA5761\n",
279 buffer[13], buffer[14], buffer[15]);
280 return -EINVAL;
281 }
282 printk(KERN_WARNING "tea5761: TEA%02x%02x detected. "
283 "Manufacturer ID= 0x%02x\n",
284 buffer[14], buffer[15], buffer[13]);
285
286 return 0;
287 }
288
tea5761_release(struct dvb_frontend * fe)289 static int tea5761_release(struct dvb_frontend *fe)
290 {
291 kfree(fe->tuner_priv);
292 fe->tuner_priv = NULL;
293
294 return 0;
295 }
296
tea5761_get_frequency(struct dvb_frontend * fe,u32 * frequency)297 static int tea5761_get_frequency(struct dvb_frontend *fe, u32 *frequency)
298 {
299 struct tea5761_priv *priv = fe->tuner_priv;
300 *frequency = priv->frequency;
301 return 0;
302 }
303
304 static const struct dvb_tuner_ops tea5761_tuner_ops = {
305 .info = {
306 .name = "tea5761", // Philips TEA5761HN FM Radio
307 },
308 .set_analog_params = set_radio_freq,
309 .sleep = set_radio_sleep,
310 .release = tea5761_release,
311 .get_frequency = tea5761_get_frequency,
312 .get_status = tea5761_get_status,
313 .get_rf_strength = tea5761_get_rf_strength,
314 };
315
tea5761_attach(struct dvb_frontend * fe,struct i2c_adapter * i2c_adap,u8 i2c_addr)316 struct dvb_frontend *tea5761_attach(struct dvb_frontend *fe,
317 struct i2c_adapter* i2c_adap,
318 u8 i2c_addr)
319 {
320 struct tea5761_priv *priv = NULL;
321
322 if (tea5761_autodetection(i2c_adap, i2c_addr) != 0)
323 return NULL;
324
325 priv = kzalloc(sizeof(struct tea5761_priv), GFP_KERNEL);
326 if (priv == NULL)
327 return NULL;
328 fe->tuner_priv = priv;
329
330 priv->i2c_props.addr = i2c_addr;
331 priv->i2c_props.adap = i2c_adap;
332 priv->i2c_props.name = "tea5761";
333
334 memcpy(&fe->ops.tuner_ops, &tea5761_tuner_ops,
335 sizeof(struct dvb_tuner_ops));
336
337 tuner_info("type set to %s\n", "Philips TEA5761HN FM Radio");
338
339 return fe;
340 }
341
342
343 EXPORT_SYMBOL_GPL(tea5761_attach);
344 EXPORT_SYMBOL_GPL(tea5761_autodetection);
345
346 MODULE_DESCRIPTION("Philips TEA5761 FM tuner driver");
347 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
348 MODULE_LICENSE("GPL");
349