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/slab.h>
27 #include <linux/ioctl.h>
28 #include <asm/uaccess.h>
29 #include <linux/i2c.h>
30 #include <linux/i2c-id.h>
31 #include <linux/videodev2.h>
32 #include <media/v4l2-device.h>
33 #include <media/v4l2-chip-ident.h>
34 #include <media/v4l2-i2c-drv.h>
36 MODULE_DESCRIPTION("wm8739 driver");
37 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
38 MODULE_LICENSE("GPL");
42 module_param(debug, int, 0644);
44 MODULE_PARM_DESC(debug, "Debug level (0-1)");
47 /* ------------------------------------------------------------------------ */
51 R5 = 5, R6, R7, R8, R9, R15 = 15,
56 struct v4l2_subdev sd;
61 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
62 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
65 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
67 return container_of(sd, struct wm8739_state, sd);
70 /* ------------------------------------------------------------------------ */
72 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
74 struct i2c_client *client = v4l2_get_subdevdata(sd);
77 if (reg < 0 || reg >= TOT_REGS) {
78 v4l2_err(sd, "Invalid register R%d\n", reg);
82 v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
84 for (i = 0; i < 3; i++)
85 if (i2c_smbus_write_byte_data(client,
86 (reg << 1) | (val >> 8), val & 0xff) == 0)
88 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
92 /* write regs to set audio volume etc */
93 static void wm8739_set_audio(struct v4l2_subdev *sd)
95 struct wm8739_state *state = to_state(sd);
96 u16 mute = state->muted ? 0x80 : 0;
98 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
99 * Default setting: 0x17 = 0 dB
101 wm8739_write(sd, R0, (state->vol_l & 0x1f) | mute);
102 wm8739_write(sd, R1, (state->vol_r & 0x1f) | mute);
105 static int wm8739_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
107 struct wm8739_state *state = to_state(sd);
110 case V4L2_CID_AUDIO_MUTE:
111 ctrl->value = state->muted;
114 case V4L2_CID_AUDIO_VOLUME:
115 ctrl->value = state->volume;
118 case V4L2_CID_AUDIO_BALANCE:
119 ctrl->value = state->balance;
128 static int wm8739_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
130 struct wm8739_state *state = to_state(sd);
131 unsigned int work_l, work_r;
134 case V4L2_CID_AUDIO_MUTE:
135 state->muted = ctrl->value;
138 case V4L2_CID_AUDIO_VOLUME:
139 state->volume = ctrl->value;
142 case V4L2_CID_AUDIO_BALANCE:
143 state->balance = ctrl->value;
150 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
151 work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
152 work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
154 state->vol_l = (long)work_l * 31 / 65535;
155 state->vol_r = (long)work_r * 31 / 65535;
157 /* set audio volume etc. */
158 wm8739_set_audio(sd);
162 /* ------------------------------------------------------------------------ */
164 static struct v4l2_queryctrl wm8739_qctrl[] = {
166 .id = V4L2_CID_AUDIO_VOLUME,
171 .default_value = 58880,
173 .type = V4L2_CTRL_TYPE_INTEGER,
175 .id = V4L2_CID_AUDIO_MUTE,
182 .type = V4L2_CTRL_TYPE_BOOLEAN,
184 .id = V4L2_CID_AUDIO_BALANCE,
189 .default_value = 32768,
191 .type = V4L2_CTRL_TYPE_INTEGER,
195 /* ------------------------------------------------------------------------ */
197 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
199 struct wm8739_state *state = to_state(sd);
201 state->clock_freq = audiofreq;
203 wm8739_write(sd, R9, 0x000);
206 /* 256fps, fs=44.1k */
207 wm8739_write(sd, R8, 0x020);
211 wm8739_write(sd, R8, 0x000);
215 wm8739_write(sd, R8, 0x018);
221 wm8739_write(sd, R9, 0x001);
225 static int wm8739_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
229 for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
230 if (qc->id && qc->id == wm8739_qctrl[i].id) {
231 memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
237 static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
239 struct i2c_client *client = v4l2_get_subdevdata(sd);
241 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0);
244 static int wm8739_log_status(struct v4l2_subdev *sd)
246 struct wm8739_state *state = to_state(sd);
248 v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
249 v4l2_info(sd, "Volume L: %02x%s\n", state->vol_l & 0x1f,
250 state->muted ? " (muted)" : "");
251 v4l2_info(sd, "Volume R: %02x%s\n", state->vol_r & 0x1f,
252 state->muted ? " (muted)" : "");
256 /* ----------------------------------------------------------------------- */
258 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
259 .log_status = wm8739_log_status,
260 .g_chip_ident = wm8739_g_chip_ident,
261 .queryctrl = wm8739_queryctrl,
262 .g_ctrl = wm8739_g_ctrl,
263 .s_ctrl = wm8739_s_ctrl,
266 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
267 .s_clock_freq = wm8739_s_clock_freq,
270 static const struct v4l2_subdev_ops wm8739_ops = {
271 .core = &wm8739_core_ops,
272 .audio = &wm8739_audio_ops,
275 /* ------------------------------------------------------------------------ */
277 /* i2c implementation */
279 static int wm8739_probe(struct i2c_client *client,
280 const struct i2c_device_id *id)
282 struct wm8739_state *state;
283 struct v4l2_subdev *sd;
285 /* Check if the adapter supports the needed features */
286 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
289 v4l_info(client, "chip found @ 0x%x (%s)\n",
290 client->addr << 1, client->adapter->name);
292 state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
296 v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
297 state->vol_l = 0x17; /* 0dB */
298 state->vol_r = 0x17; /* 0dB */
300 state->balance = 32768;
301 /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
302 state->volume = ((long)state->vol_l + 1) * 65535 / 31;
303 state->clock_freq = 48000;
305 /* Initialize wm8739 */
308 wm8739_write(sd, R15, 0x00);
309 /* filter setting, high path, offet clear */
310 wm8739_write(sd, R5, 0x000);
311 /* ADC, OSC, Power Off mode Disable */
312 wm8739_write(sd, R6, 0x000);
313 /* Digital Audio interface format:
314 Enable Master mode, 24 bit, MSB first/left justified */
315 wm8739_write(sd, R7, 0x049);
316 /* sampling control: normal, 256fs, 48KHz sampling rate */
317 wm8739_write(sd, R8, 0x000);
319 wm8739_write(sd, R9, 0x001);
320 /* set volume/mute */
321 wm8739_set_audio(sd);
325 static int wm8739_remove(struct i2c_client *client)
327 struct v4l2_subdev *sd = i2c_get_clientdata(client);
329 v4l2_device_unregister_subdev(sd);
334 static const struct i2c_device_id wm8739_id[] = {
338 MODULE_DEVICE_TABLE(i2c, wm8739_id);
340 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
342 .probe = wm8739_probe,
343 .remove = wm8739_remove,
344 .id_table = wm8739_id,