4 * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
6 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/ioctl.h>
27 #include <asm/uaccess.h>
28 #include <linux/i2c.h>
29 #include <linux/i2c-id.h>
30 #include <linux/videodev2.h>
31 #include <media/v4l2-common.h>
32 #include <media/v4l2-chip-ident.h>
33 #include <media/v4l2-i2c-drv.h>
35 MODULE_DESCRIPTION("wm8739 driver");
36 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
37 MODULE_LICENSE("GPL");
41 module_param(debug
, int, 0644);
43 MODULE_PARM_DESC(debug
, "Debug level (0-1)");
46 /* ------------------------------------------------------------------------ */
50 R5
= 5, R6
, R7
, R8
, R9
, R15
= 15,
59 u8 vol_l
; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
60 u8 vol_r
; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
63 /* ------------------------------------------------------------------------ */
65 static int wm8739_write(struct i2c_client
*client
, int reg
, u16 val
)
69 if (reg
< 0 || reg
>= TOT_REGS
) {
70 v4l_err(client
, "Invalid register R%d\n", reg
);
74 v4l_dbg(1, debug
, client
, "write: %02x %02x\n", reg
, val
);
76 for (i
= 0; i
< 3; i
++)
77 if (i2c_smbus_write_byte_data(client
,
78 (reg
<< 1) | (val
>> 8), val
& 0xff) == 0)
80 v4l_err(client
, "I2C: cannot write %03x to register R%d\n", val
, reg
);
84 /* write regs to set audio volume etc */
85 static void wm8739_set_audio(struct i2c_client
*client
)
87 struct wm8739_state
*state
= i2c_get_clientdata(client
);
88 u16 mute
= state
->muted
? 0x80 : 0;
90 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
91 * Default setting: 0x17 = 0 dB
93 wm8739_write(client
, R0
, (state
->vol_l
& 0x1f) | mute
);
94 wm8739_write(client
, R1
, (state
->vol_r
& 0x1f) | mute
);
97 static int wm8739_get_ctrl(struct i2c_client
*client
, struct v4l2_control
*ctrl
)
99 struct wm8739_state
*state
= i2c_get_clientdata(client
);
102 case V4L2_CID_AUDIO_MUTE
:
103 ctrl
->value
= state
->muted
;
106 case V4L2_CID_AUDIO_VOLUME
:
107 ctrl
->value
= state
->volume
;
110 case V4L2_CID_AUDIO_BALANCE
:
111 ctrl
->value
= state
->balance
;
120 static int wm8739_set_ctrl(struct i2c_client
*client
, struct v4l2_control
*ctrl
)
122 struct wm8739_state
*state
= i2c_get_clientdata(client
);
123 unsigned int work_l
, work_r
;
126 case V4L2_CID_AUDIO_MUTE
:
127 state
->muted
= ctrl
->value
;
130 case V4L2_CID_AUDIO_VOLUME
:
131 state
->volume
= ctrl
->value
;
134 case V4L2_CID_AUDIO_BALANCE
:
135 state
->balance
= ctrl
->value
;
142 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
143 work_l
= (min(65536 - state
->balance
, 32768) * state
->volume
) / 32768;
144 work_r
= (min(state
->balance
, (u16
)32768) * state
->volume
) / 32768;
146 state
->vol_l
= (long)work_l
* 31 / 65535;
147 state
->vol_r
= (long)work_r
* 31 / 65535;
149 /* set audio volume etc. */
150 wm8739_set_audio(client
);
154 /* ------------------------------------------------------------------------ */
156 static struct v4l2_queryctrl wm8739_qctrl
[] = {
158 .id
= V4L2_CID_AUDIO_VOLUME
,
163 .default_value
= 58880,
165 .type
= V4L2_CTRL_TYPE_INTEGER
,
167 .id
= V4L2_CID_AUDIO_MUTE
,
174 .type
= V4L2_CTRL_TYPE_BOOLEAN
,
176 .id
= V4L2_CID_AUDIO_BALANCE
,
181 .default_value
= 32768,
183 .type
= V4L2_CTRL_TYPE_INTEGER
,
187 /* ------------------------------------------------------------------------ */
189 static int wm8739_command(struct i2c_client
*client
, unsigned cmd
, void *arg
)
191 struct wm8739_state
*state
= i2c_get_clientdata(client
);
194 case VIDIOC_INT_AUDIO_CLOCK_FREQ
:
196 u32 audiofreq
= *(u32
*)arg
;
198 state
->clock_freq
= audiofreq
;
200 wm8739_write(client
, R9
, 0x000);
203 /* 256fps, fs=44.1k */
204 wm8739_write(client
, R8
, 0x020);
208 wm8739_write(client
, R8
, 0x000);
212 wm8739_write(client
, R8
, 0x018);
218 wm8739_write(client
, R9
, 0x001);
223 return wm8739_get_ctrl(client
, arg
);
226 return wm8739_set_ctrl(client
, arg
);
228 case VIDIOC_QUERYCTRL
:
230 struct v4l2_queryctrl
*qc
= arg
;
233 for (i
= 0; i
< ARRAY_SIZE(wm8739_qctrl
); i
++)
234 if (qc
->id
&& qc
->id
== wm8739_qctrl
[i
].id
) {
235 memcpy(qc
, &wm8739_qctrl
[i
], sizeof(*qc
));
241 case VIDIOC_G_CHIP_IDENT
:
242 return v4l2_chip_ident_i2c_client(client
,
243 arg
, V4L2_IDENT_WM8739
, 0);
245 case VIDIOC_LOG_STATUS
:
246 v4l_info(client
, "Frequency: %u Hz\n", state
->clock_freq
);
247 v4l_info(client
, "Volume L: %02x%s\n", state
->vol_l
& 0x1f,
248 state
->muted
? " (muted)" : "");
249 v4l_info(client
, "Volume R: %02x%s\n", state
->vol_r
& 0x1f,
250 state
->muted
? " (muted)" : "");
260 /* ------------------------------------------------------------------------ */
262 /* i2c implementation */
264 static int wm8739_probe(struct i2c_client
*client
,
265 const struct i2c_device_id
*id
)
267 struct wm8739_state
*state
;
269 /* Check if the adapter supports the needed features */
270 if (!i2c_check_functionality(client
->adapter
, I2C_FUNC_SMBUS_BYTE_DATA
))
273 v4l_info(client
, "chip found @ 0x%x (%s)\n",
274 client
->addr
<< 1, client
->adapter
->name
);
276 state
= kmalloc(sizeof(struct wm8739_state
), GFP_KERNEL
);
281 state
->vol_l
= 0x17; /* 0dB */
282 state
->vol_r
= 0x17; /* 0dB */
284 state
->balance
= 32768;
285 /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
286 state
->volume
= ((long)state
->vol_l
+ 1) * 65535 / 31;
287 state
->clock_freq
= 48000;
288 i2c_set_clientdata(client
, state
);
290 /* Initialize wm8739 */
293 wm8739_write(client
, R15
, 0x00);
294 /* filter setting, high path, offet clear */
295 wm8739_write(client
, R5
, 0x000);
296 /* ADC, OSC, Power Off mode Disable */
297 wm8739_write(client
, R6
, 0x000);
298 /* Digital Audio interface format:
299 Enable Master mode, 24 bit, MSB first/left justified */
300 wm8739_write(client
, R7
, 0x049);
301 /* sampling control: normal, 256fs, 48KHz sampling rate */
302 wm8739_write(client
, R8
, 0x000);
304 wm8739_write(client
, R9
, 0x001);
305 /* set volume/mute */
306 wm8739_set_audio(client
);
310 static int wm8739_remove(struct i2c_client
*client
)
312 kfree(i2c_get_clientdata(client
));
316 static const struct i2c_device_id wm8739_id
[] = {
320 MODULE_DEVICE_TABLE(i2c
, wm8739_id
);
322 static struct v4l2_i2c_driver_data v4l2_i2c_data
= {
324 .driverid
= I2C_DRIVERID_WM8739
,
325 .command
= wm8739_command
,
326 .probe
= wm8739_probe
,
327 .remove
= wm8739_remove
,
328 .id_table
= wm8739_id
,