/drivers/media/video/wm8739.c

  1/*
  2 * wm8739
  3 *
  4 * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
  5 *
  6 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
  7 * - Cleanup
  8 *
  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.
 13 *
 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.
 18 *
 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.
 22 */
 23
 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>
 35
 36MODULE_DESCRIPTION("wm8739 driver");
 37MODULE_AUTHOR("T. Adachi, Hans Verkuil");
 38MODULE_LICENSE("GPL");
 39
 40static int debug;
 41
 42module_param(debug, int, 0644);
 43
 44MODULE_PARM_DESC(debug, "Debug level (0-1)");
 45
 46
 47/* ------------------------------------------------------------------------ */
 48
 49enum {
 50	R0 = 0, R1,
 51	R5 = 5, R6, R7, R8, R9, R15 = 15,
 52	TOT_REGS
 53};
 54
 55struct wm8739_state {
 56	struct v4l2_subdev sd;
 57	u32 clock_freq;
 58	u8 muted;
 59	u16 volume;
 60	u16 balance;
 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 */
 63};
 64
 65static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
 66{
 67	return container_of(sd, struct wm8739_state, sd);
 68}
 69
 70/* ------------------------------------------------------------------------ */
 71
 72static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
 73{
 74	struct i2c_client *client = v4l2_get_subdevdata(sd);
 75	int i;
 76
 77	if (reg < 0 || reg >= TOT_REGS) {
 78		v4l2_err(sd, "Invalid register R%d\n", reg);
 79		return -1;
 80	}
 81
 82	v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
 83
 84	for (i = 0; i < 3; i++)
 85		if (i2c_smbus_write_byte_data(client,
 86				(reg << 1) | (val >> 8), val & 0xff) == 0)
 87			return 0;
 88	v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
 89	return -1;
 90}
 91
 92/* write regs to set audio volume etc */
 93static void wm8739_set_audio(struct v4l2_subdev *sd)
 94{
 95	struct wm8739_state *state = to_state(sd);
 96	u16 mute = state->muted ? 0x80 : 0;
 97
 98	/* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
 99	 * Default setting: 0x17 = 0 dB
100	 */
101	wm8739_write(sd, R0, (state->vol_l & 0x1f) | mute);
102	wm8739_write(sd, R1, (state->vol_r & 0x1f) | mute);
103}
104
105static int wm8739_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
106{
107	struct wm8739_state *state = to_state(sd);
108
109	switch (ctrl->id) {
110	case V4L2_CID_AUDIO_MUTE:
111		ctrl->value = state->muted;
112		break;
113
114	case V4L2_CID_AUDIO_VOLUME:
115		ctrl->value = state->volume;
116		break;
117
118	case V4L2_CID_AUDIO_BALANCE:
119		ctrl->value = state->balance;
120		break;
121
122	default:
123		return -EINVAL;
124	}
125	return 0;
126}
127
128static int wm8739_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
129{
130	struct wm8739_state *state = to_state(sd);
131	unsigned int work_l, work_r;
132
133	switch (ctrl->id) {
134	case V4L2_CID_AUDIO_MUTE:
135		state->muted = ctrl->value;
136		break;
137
138	case V4L2_CID_AUDIO_VOLUME:
139		state->volume = ctrl->value;
140		break;
141
142	case V4L2_CID_AUDIO_BALANCE:
143		state->balance = ctrl->value;
144		break;
145
146	default:
147		return -EINVAL;
148	}
149
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;
153
154	state->vol_l = (long)work_l * 31 / 65535;
155	state->vol_r = (long)work_r * 31 / 65535;
156
157	/* set audio volume etc. */
158	wm8739_set_audio(sd);
159	return 0;
160}
161
162/* ------------------------------------------------------------------------ */
163
164static struct v4l2_queryctrl wm8739_qctrl[] = {
165	{
166		.id            = V4L2_CID_AUDIO_VOLUME,
167		.name          = "Volume",
168		.minimum       = 0,
169		.maximum       = 65535,
170		.step          = 65535/100,
171		.default_value = 58880,
172		.flags         = 0,
173		.type          = V4L2_CTRL_TYPE_INTEGER,
174	}, {
175		.id            = V4L2_CID_AUDIO_MUTE,
176		.name          = "Mute",
177		.minimum       = 0,
178		.maximum       = 1,
179		.step          = 1,
180		.default_value = 1,
181		.flags         = 0,
182		.type          = V4L2_CTRL_TYPE_BOOLEAN,
183	}, {
184		.id            = V4L2_CID_AUDIO_BALANCE,
185		.name          = "Balance",
186		.minimum       = 0,
187		.maximum       = 65535,
188		.step          = 65535/100,
189		.default_value = 32768,
190		.flags         = 0,
191		.type          = V4L2_CTRL_TYPE_INTEGER,
192	}
193};
194
195/* ------------------------------------------------------------------------ */
196
197static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
198{
199	struct wm8739_state *state = to_state(sd);
200
201	state->clock_freq = audiofreq;
202	/* de-activate */
203	wm8739_write(sd, R9, 0x000);
204	switch (audiofreq) {
205	case 44100:
206		/* 256fps, fs=44.1k */
207		wm8739_write(sd, R8, 0x020);
208		break;
209	case 48000:
210		/* 256fps, fs=48k */
211		wm8739_write(sd, R8, 0x000);
212		break;
213	case 32000:
214		/* 256fps, fs=32k */
215		wm8739_write(sd, R8, 0x018);
216		break;
217	default:
218		break;
219	}
220	/* activate */
221	wm8739_write(sd, R9, 0x001);
222	return 0;
223}
224
225static int wm8739_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc)
226{
227	int i;
228
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));
232			return 0;
233		}
234	return -EINVAL;
235}
236
237static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
238{
239	struct i2c_client *client = v4l2_get_subdevdata(sd);
240
241	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0);
242}
243
244static int wm8739_log_status(struct v4l2_subdev *sd)
245{
246	struct wm8739_state *state = to_state(sd);
247
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)" : "");
253	return 0;
254}
255
256/* ----------------------------------------------------------------------- */
257
258static 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,
264};
265
266static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
267	.s_clock_freq = wm8739_s_clock_freq,
268};
269
270static const struct v4l2_subdev_ops wm8739_ops = {
271	.core = &wm8739_core_ops,
272	.audio = &wm8739_audio_ops,
273};
274
275/* ------------------------------------------------------------------------ */
276
277/* i2c implementation */
278
279static int wm8739_probe(struct i2c_client *client,
280			const struct i2c_device_id *id)
281{
282	struct wm8739_state *state;
283	struct v4l2_subdev *sd;
284
285	/* Check if the adapter supports the needed features */
286	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
287		return -EIO;
288
289	v4l_info(client, "chip found @ 0x%x (%s)\n",
290			client->addr << 1, client->adapter->name);
291
292	state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
293	if (state == NULL)
294		return -ENOMEM;
295	sd = &state->sd;
296	v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
297	state->vol_l = 0x17; /* 0dB */
298	state->vol_r = 0x17; /* 0dB */
299	state->muted = 0;
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;
304
305	/* Initialize wm8739 */
306
307	/* reset */
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);
318	/* activate */
319	wm8739_write(sd, R9, 0x001);
320	/* set volume/mute */
321	wm8739_set_audio(sd);
322	return 0;
323}
324
325static int wm8739_remove(struct i2c_client *client)
326{
327	struct v4l2_subdev *sd = i2c_get_clientdata(client);
328
329	v4l2_device_unregister_subdev(sd);
330	kfree(to_state(sd));
331	return 0;
332}
333
334static const struct i2c_device_id wm8739_id[] = {
335	{ "wm8739", 0 },
336	{ }
337};
338MODULE_DEVICE_TABLE(i2c, wm8739_id);
339
340static struct v4l2_i2c_driver_data v4l2_i2c_data = {
341	.name = "wm8739",
342	.probe = wm8739_probe,
343	.remove = wm8739_remove,
344	.id_table = wm8739_id,
345};