Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
tea6330t.c
Go to the documentation of this file.
1 /*
2  * Routines for control of the TEA6330T circuit via i2c bus
3  * Sound fader control circuit for car radios by Philips Semiconductors
4  * Copyright (c) by Jaroslav Kysela <[email protected]>
5  *
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  *
21  */
22 
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/module.h>
26 #include <sound/core.h>
27 #include <sound/control.h>
28 #include <sound/tea6330t.h>
29 
30 MODULE_AUTHOR("Jaroslav Kysela <[email protected]>");
31 MODULE_DESCRIPTION("Routines for control of the TEA6330T circuit via i2c bus");
32 MODULE_LICENSE("GPL");
33 
34 #define TEA6330T_ADDR (0x80>>1) /* fixed address */
35 
36 #define TEA6330T_SADDR_VOLUME_LEFT 0x00 /* volume left */
37 #define TEA6330T_SADDR_VOLUME_RIGHT 0x01 /* volume right */
38 #define TEA6330T_SADDR_BASS 0x02 /* bass control */
39 #define TEA6330T_SADDR_TREBLE 0x03 /* treble control */
40 #define TEA6330T_SADDR_FADER 0x04 /* fader control */
41 #define TEA6330T_MFN 0x20 /* mute control for selected channels */
42 #define TEA6330T_FCH 0x10 /* select fader channels - front or rear */
43 #define TEA6330T_SADDR_AUDIO_SWITCH 0x05 /* audio switch */
44 #define TEA6330T_GMU 0x80 /* mute control, general mute */
45 #define TEA6330T_EQN 0x40 /* equalizer switchover (0=equalizer-on) */
46 
47 
48 struct tea6330t {
50  struct snd_i2c_bus *bus;
51  int equalizer;
52  int fader;
53  unsigned char regs[8];
54  unsigned char mleft, mright;
55  unsigned char bass, treble;
56  unsigned char max_bass, max_treble;
57 };
58 
59 
61 {
62  int res;
63 
64  snd_i2c_lock(bus);
65  res = snd_i2c_probeaddr(bus, TEA6330T_ADDR);
66  snd_i2c_unlock(bus);
67  return res;
68 }
69 
70 #if 0
71 static void snd_tea6330t_set(struct tea6330t *tea,
72  unsigned char addr, unsigned char value)
73 {
74 #if 0
75  printk(KERN_DEBUG "set - 0x%x/0x%x\n", addr, value);
76 #endif
77  snd_i2c_write(tea->bus, TEA6330T_ADDR, addr, value, 1);
78 }
79 #endif
80 
81 #define TEA6330T_MASTER_VOLUME(xname, xindex) \
82 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
83  .info = snd_tea6330t_info_master_volume, \
84  .get = snd_tea6330t_get_master_volume, .put = snd_tea6330t_put_master_volume }
85 
86 static int snd_tea6330t_info_master_volume(struct snd_kcontrol *kcontrol,
87  struct snd_ctl_elem_info *uinfo)
88 {
90  uinfo->count = 2;
91  uinfo->value.integer.min = 0;
92  uinfo->value.integer.max = 43;
93  return 0;
94 }
95 
96 static int snd_tea6330t_get_master_volume(struct snd_kcontrol *kcontrol,
97  struct snd_ctl_elem_value *ucontrol)
98 {
99  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
100 
101  snd_i2c_lock(tea->bus);
102  ucontrol->value.integer.value[0] = tea->mleft - 0x14;
103  ucontrol->value.integer.value[1] = tea->mright - 0x14;
104  snd_i2c_unlock(tea->bus);
105  return 0;
106 }
107 
108 static int snd_tea6330t_put_master_volume(struct snd_kcontrol *kcontrol,
109  struct snd_ctl_elem_value *ucontrol)
110 {
111  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
112  int change, count, err;
113  unsigned char bytes[3];
114  unsigned char val1, val2;
115 
116  val1 = (ucontrol->value.integer.value[0] % 44) + 0x14;
117  val2 = (ucontrol->value.integer.value[1] % 44) + 0x14;
118  snd_i2c_lock(tea->bus);
119  change = val1 != tea->mleft || val2 != tea->mright;
120  tea->mleft = val1;
121  tea->mright = val2;
122  count = 0;
123  if (tea->regs[TEA6330T_SADDR_VOLUME_LEFT] != 0) {
124  bytes[count++] = TEA6330T_SADDR_VOLUME_LEFT;
125  bytes[count++] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] = tea->mleft;
126  }
127  if (tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] != 0) {
128  if (count == 0)
129  bytes[count++] = TEA6330T_SADDR_VOLUME_RIGHT;
130  bytes[count++] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] = tea->mright;
131  }
132  if (count > 0) {
133  if ((err = snd_i2c_sendbytes(tea->device, bytes, count)) < 0)
134  change = err;
135  }
136  snd_i2c_unlock(tea->bus);
137  return change;
138 }
139 
140 #define TEA6330T_MASTER_SWITCH(xname, xindex) \
141 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
142  .info = snd_tea6330t_info_master_switch, \
143  .get = snd_tea6330t_get_master_switch, .put = snd_tea6330t_put_master_switch }
144 
145 #define snd_tea6330t_info_master_switch snd_ctl_boolean_stereo_info
146 
147 static int snd_tea6330t_get_master_switch(struct snd_kcontrol *kcontrol,
148  struct snd_ctl_elem_value *ucontrol)
149 {
150  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
151 
152  snd_i2c_lock(tea->bus);
153  ucontrol->value.integer.value[0] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] == 0 ? 0 : 1;
154  ucontrol->value.integer.value[1] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] == 0 ? 0 : 1;
155  snd_i2c_unlock(tea->bus);
156  return 0;
157 }
158 
159 static int snd_tea6330t_put_master_switch(struct snd_kcontrol *kcontrol,
160  struct snd_ctl_elem_value *ucontrol)
161 {
162  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
163  int change, err;
164  unsigned char bytes[3];
165  unsigned char oval1, oval2, val1, val2;
166 
167  val1 = ucontrol->value.integer.value[0] & 1;
168  val2 = ucontrol->value.integer.value[1] & 1;
169  snd_i2c_lock(tea->bus);
170  oval1 = tea->regs[TEA6330T_SADDR_VOLUME_LEFT] == 0 ? 0 : 1;
171  oval2 = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] == 0 ? 0 : 1;
172  change = val1 != oval1 || val2 != oval2;
173  tea->regs[TEA6330T_SADDR_VOLUME_LEFT] = val1 ? tea->mleft : 0;
174  tea->regs[TEA6330T_SADDR_VOLUME_RIGHT] = val2 ? tea->mright : 0;
175  bytes[0] = TEA6330T_SADDR_VOLUME_LEFT;
176  bytes[1] = tea->regs[TEA6330T_SADDR_VOLUME_LEFT];
177  bytes[2] = tea->regs[TEA6330T_SADDR_VOLUME_RIGHT];
178  if ((err = snd_i2c_sendbytes(tea->device, bytes, 3)) < 0)
179  change = err;
180  snd_i2c_unlock(tea->bus);
181  return change;
182 }
183 
184 #define TEA6330T_BASS(xname, xindex) \
185 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
186  .info = snd_tea6330t_info_bass, \
187  .get = snd_tea6330t_get_bass, .put = snd_tea6330t_put_bass }
188 
189 static int snd_tea6330t_info_bass(struct snd_kcontrol *kcontrol,
190  struct snd_ctl_elem_info *uinfo)
191 {
192  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
193 
195  uinfo->count = 1;
196  uinfo->value.integer.min = 0;
197  uinfo->value.integer.max = tea->max_bass;
198  return 0;
199 }
200 
201 static int snd_tea6330t_get_bass(struct snd_kcontrol *kcontrol,
202  struct snd_ctl_elem_value *ucontrol)
203 {
204  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
205 
206  ucontrol->value.integer.value[0] = tea->bass;
207  return 0;
208 }
209 
210 static int snd_tea6330t_put_bass(struct snd_kcontrol *kcontrol,
211  struct snd_ctl_elem_value *ucontrol)
212 {
213  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
214  int change, err;
215  unsigned char bytes[2];
216  unsigned char val1;
217 
218  val1 = ucontrol->value.integer.value[0] % (tea->max_bass + 1);
219  snd_i2c_lock(tea->bus);
220  tea->bass = val1;
221  val1 += tea->equalizer ? 7 : 3;
222  change = tea->regs[TEA6330T_SADDR_BASS] != val1;
223  bytes[0] = TEA6330T_SADDR_BASS;
224  bytes[1] = tea->regs[TEA6330T_SADDR_BASS] = val1;
225  if ((err = snd_i2c_sendbytes(tea->device, bytes, 2)) < 0)
226  change = err;
227  snd_i2c_unlock(tea->bus);
228  return change;
229 }
230 
231 #define TEA6330T_TREBLE(xname, xindex) \
232 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
233  .info = snd_tea6330t_info_treble, \
234  .get = snd_tea6330t_get_treble, .put = snd_tea6330t_put_treble }
235 
236 static int snd_tea6330t_info_treble(struct snd_kcontrol *kcontrol,
237  struct snd_ctl_elem_info *uinfo)
238 {
239  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
240 
242  uinfo->count = 1;
243  uinfo->value.integer.min = 0;
244  uinfo->value.integer.max = tea->max_treble;
245  return 0;
246 }
247 
248 static int snd_tea6330t_get_treble(struct snd_kcontrol *kcontrol,
249  struct snd_ctl_elem_value *ucontrol)
250 {
251  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
252 
253  ucontrol->value.integer.value[0] = tea->treble;
254  return 0;
255 }
256 
257 static int snd_tea6330t_put_treble(struct snd_kcontrol *kcontrol,
258  struct snd_ctl_elem_value *ucontrol)
259 {
260  struct tea6330t *tea = snd_kcontrol_chip(kcontrol);
261  int change, err;
262  unsigned char bytes[2];
263  unsigned char val1;
264 
265  val1 = ucontrol->value.integer.value[0] % (tea->max_treble + 1);
266  snd_i2c_lock(tea->bus);
267  tea->treble = val1;
268  val1 += 3;
269  change = tea->regs[TEA6330T_SADDR_TREBLE] != val1;
270  bytes[0] = TEA6330T_SADDR_TREBLE;
271  bytes[1] = tea->regs[TEA6330T_SADDR_TREBLE] = val1;
272  if ((err = snd_i2c_sendbytes(tea->device, bytes, 2)) < 0)
273  change = err;
274  snd_i2c_unlock(tea->bus);
275  return change;
276 }
277 
278 static struct snd_kcontrol_new snd_tea6330t_controls[] = {
279 TEA6330T_MASTER_SWITCH("Master Playback Switch", 0),
280 TEA6330T_MASTER_VOLUME("Master Playback Volume", 0),
281 TEA6330T_BASS("Tone Control - Bass", 0),
282 TEA6330T_TREBLE("Tone Control - Treble", 0)
283 };
284 
285 static void snd_tea6330_free(struct snd_i2c_device *device)
286 {
287  kfree(device->private_data);
288 }
289 
291  struct snd_i2c_bus *bus,
292  int equalizer, int fader)
293 {
294  struct snd_i2c_device *device;
295  struct tea6330t *tea;
296  struct snd_kcontrol_new *knew;
297  unsigned int idx;
298  int err = -ENOMEM;
299  u8 default_treble, default_bass;
300  unsigned char bytes[7];
301 
302  tea = kzalloc(sizeof(*tea), GFP_KERNEL);
303  if (tea == NULL)
304  return -ENOMEM;
305  if ((err = snd_i2c_device_create(bus, "TEA6330T", TEA6330T_ADDR, &device)) < 0) {
306  kfree(tea);
307  return err;
308  }
309  tea->device = device;
310  tea->bus = bus;
311  tea->equalizer = equalizer;
312  tea->fader = fader;
313  device->private_data = tea;
314  device->private_free = snd_tea6330_free;
315 
316  snd_i2c_lock(bus);
317 
318  /* turn fader off and handle equalizer */
319  tea->regs[TEA6330T_SADDR_FADER] = 0x3f;
320  tea->regs[TEA6330T_SADDR_AUDIO_SWITCH] = equalizer ? 0 : TEA6330T_EQN;
321  /* initialize mixer */
322  if (!tea->equalizer) {
323  tea->max_bass = 9;
324  tea->max_treble = 8;
325  default_bass = 3 + 4;
326  tea->bass = 4;
327  default_treble = 3 + 4;
328  tea->treble = 4;
329  } else {
330  tea->max_bass = 5;
331  tea->max_treble = 0;
332  default_bass = 7 + 4;
333  tea->bass = 4;
334  default_treble = 3;
335  tea->treble = 0;
336  }
337  tea->mleft = tea->mright = 0x14;
338  tea->regs[TEA6330T_SADDR_BASS] = default_bass;
339  tea->regs[TEA6330T_SADDR_TREBLE] = default_treble;
340 
341  /* compose I2C message and put the hardware to initial state */
342  bytes[0] = TEA6330T_SADDR_VOLUME_LEFT;
343  for (idx = 0; idx < 6; idx++)
344  bytes[idx+1] = tea->regs[idx];
345  if ((err = snd_i2c_sendbytes(device, bytes, 7)) < 0)
346  goto __error;
347 
348  strcat(card->mixername, ",TEA6330T");
349  if ((err = snd_component_add(card, "TEA6330T")) < 0)
350  goto __error;
351 
352  for (idx = 0; idx < ARRAY_SIZE(snd_tea6330t_controls); idx++) {
353  knew = &snd_tea6330t_controls[idx];
354  if (tea->treble == 0 && !strcmp(knew->name, "Tone Control - Treble"))
355  continue;
356  if ((err = snd_ctl_add(card, snd_ctl_new1(knew, tea))) < 0)
357  goto __error;
358  }
359 
360  snd_i2c_unlock(bus);
361  return 0;
362 
363  __error:
364  snd_i2c_unlock(bus);
365  snd_i2c_device_free(device);
366  return err;
367 }
368 
371 
372 /*
373  * INIT part
374  */
375 
376 static int __init alsa_tea6330t_init(void)
377 {
378  return 0;
379 }
380 
381 static void __exit alsa_tea6330t_exit(void)
382 {
383 }
384 
385 module_init(alsa_tea6330t_init)
386 module_exit(alsa_tea6330t_exit)