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/videodev.h>
31 #include <media/v4l2-common.h>
32 #include <media/v4l2-chip-ident.h>
33 #include <media/v4l2-i2c-drv-legacy.h>
35 MODULE_DESCRIPTION("wm8739 driver");
36 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
37 MODULE_LICENSE("GPL");
40 static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };
42 module_param(debug, int, 0644);
44 MODULE_PARM_DESC(debug, "Debug level (0-1)");
49 /* ------------------------------------------------------------------------ */
53 R5 = 5, R6, R7, R8, R9, R15 = 15,
62 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
63 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
66 /* ------------------------------------------------------------------------ */
68 static int wm8739_write(struct i2c_client *client, int reg, u16 val)
72 if (reg < 0 || reg >= TOT_REGS) {
73 v4l_err(client, "Invalid register R%d\n", reg);
77 v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);
79 for (i = 0; i < 3; i++)
80 if (i2c_smbus_write_byte_data(client,
81 (reg << 1) | (val >> 8), val & 0xff) == 0)
83 v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
87 /* write regs to set audio volume etc */
88 static void wm8739_set_audio(struct i2c_client *client)
90 struct wm8739_state *state = i2c_get_clientdata(client);
91 u16 mute = state->muted ? 0x80 : 0;
93 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
94 * Default setting: 0x17 = 0 dB
96 wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);
97 wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
100 static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
102 struct wm8739_state *state = i2c_get_clientdata(client);
105 case V4L2_CID_AUDIO_MUTE:
106 ctrl->value = state->muted;
109 case V4L2_CID_AUDIO_VOLUME:
110 ctrl->value = state->volume;
113 case V4L2_CID_AUDIO_BALANCE:
114 ctrl->value = state->balance;
123 static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
125 struct wm8739_state *state = i2c_get_clientdata(client);
126 unsigned int work_l, work_r;
129 case V4L2_CID_AUDIO_MUTE:
130 state->muted = ctrl->value;
133 case V4L2_CID_AUDIO_VOLUME:
134 state->volume = ctrl->value;
137 case V4L2_CID_AUDIO_BALANCE:
138 state->balance = ctrl->value;
145 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
146 work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
147 work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
149 state->vol_l = (long)work_l * 31 / 65535;
150 state->vol_r = (long)work_r * 31 / 65535;
152 /* set audio volume etc. */
153 wm8739_set_audio(client);
157 /* ------------------------------------------------------------------------ */
159 static struct v4l2_queryctrl wm8739_qctrl[] = {
161 .id = V4L2_CID_AUDIO_VOLUME,
166 .default_value = 58880,
168 .type = V4L2_CTRL_TYPE_INTEGER,
170 .id = V4L2_CID_AUDIO_MUTE,
177 .type = V4L2_CTRL_TYPE_BOOLEAN,
179 .id = V4L2_CID_AUDIO_BALANCE,
184 .default_value = 32768,
186 .type = V4L2_CTRL_TYPE_INTEGER,
190 /* ------------------------------------------------------------------------ */
192 static int wm8739_command(struct i2c_client *client, unsigned cmd, void *arg)
194 struct wm8739_state *state = i2c_get_clientdata(client);
197 case VIDIOC_INT_AUDIO_CLOCK_FREQ:
199 u32 audiofreq = *(u32 *)arg;
201 state->clock_freq = audiofreq;
203 wm8739_write(client, R9, 0x000);
206 /* 256fps, fs=44.1k */
207 wm8739_write(client, R8, 0x020);
211 wm8739_write(client, R8, 0x000);
215 wm8739_write(client, R8, 0x018);
221 wm8739_write(client, R9, 0x001);
226 return wm8739_get_ctrl(client, arg);
229 return wm8739_set_ctrl(client, arg);
231 case VIDIOC_QUERYCTRL:
233 struct v4l2_queryctrl *qc = arg;
236 for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
237 if (qc->id && qc->id == wm8739_qctrl[i].id) {
238 memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
244 case VIDIOC_G_CHIP_IDENT:
245 return v4l2_chip_ident_i2c_client(client,
246 arg, V4L2_IDENT_WM8739, 0);
248 case VIDIOC_LOG_STATUS:
249 v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
250 v4l_info(client, "Volume L: %02x%s\n", state->vol_l & 0x1f,
251 state->muted ? " (muted)" : "");
252 v4l_info(client, "Volume R: %02x%s\n", state->vol_r & 0x1f,
253 state->muted ? " (muted)" : "");
263 /* ------------------------------------------------------------------------ */
265 /* i2c implementation */
267 static int wm8739_probe(struct i2c_client *client)
269 struct wm8739_state *state;
271 /* Check if the adapter supports the needed features */
272 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
275 v4l_info(client, "chip found @ 0x%x (%s)\n",
276 client->addr << 1, client->adapter->name);
278 state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
283 state->vol_l = 0x17; /* 0dB */
284 state->vol_r = 0x17; /* 0dB */
286 state->balance = 32768;
287 /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
288 state->volume = ((long)state->vol_l + 1) * 65535 / 31;
289 state->clock_freq = 48000;
290 i2c_set_clientdata(client, state);
292 /* Initialize wm8739 */
295 wm8739_write(client, R15, 0x00);
296 /* filter setting, high path, offet clear */
297 wm8739_write(client, R5, 0x000);
298 /* ADC, OSC, Power Off mode Disable */
299 wm8739_write(client, R6, 0x000);
300 /* Digital Audio interface format:
301 Enable Master mode, 24 bit, MSB first/left justified */
302 wm8739_write(client, R7, 0x049);
303 /* sampling control: normal, 256fs, 48KHz sampling rate */
304 wm8739_write(client, R8, 0x000);
306 wm8739_write(client, R9, 0x001);
307 /* set volume/mute */
308 wm8739_set_audio(client);
312 static int wm8739_remove(struct i2c_client *client)
314 kfree(i2c_get_clientdata(client));
318 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
320 .driverid = I2C_DRIVERID_WM8739,
321 .command = wm8739_command,
322 .probe = wm8739_probe,
323 .remove = wm8739_remove,