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/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
34MODULE_DESCRIPTION("wm8739 driver");
35MODULE_AUTHOR("T. Adachi, Hans Verkuil");
36MODULE_LICENSE("GPL");
37
38static int debug = 0;
39static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };
40
41module_param(debug, int, 0644);
42
43MODULE_PARM_DESC(debug, "Debug level (0-1)");
44
45
46I2C_CLIENT_INSMOD;
47
48/* ------------------------------------------------------------------------ */
49
50enum {
51	R0 = 0, R1,
52	R5 = 5, R6, R7, R8, R9, R15 = 15,
53	TOT_REGS
54};
55
56struct wm8739_state {
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
65/* ------------------------------------------------------------------------ */
66
67static int wm8739_write(struct i2c_client *client, int reg, u16 val)
68{
69	int i;
70
71	if (reg < 0 || reg >= TOT_REGS) {
72		v4l_err(client, "Invalid register R%d\n", reg);
73		return -1;
74	}
75
76	v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val);
77
78	for (i = 0; i < 3; i++) {
79		if (i2c_smbus_write_byte_data(client, (reg << 1) |
80					(val >> 8), val & 0xff) == 0) {
81			return 0;
82		}
83	}
84	v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
85	return -1;
86}
87
88/* write regs to set audio volume etc */
89static void wm8739_set_audio(struct i2c_client *client)
90{
91	struct wm8739_state *state = i2c_get_clientdata(client);
92	u16 mute = state->muted ? 0x80 : 0;
93
94	/* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
95	 * Default setting: 0x17 = 0 dB
96	 */
97	wm8739_write(client, R0, (state->vol_l & 0x1f) | mute);
98	wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
99}
100
101static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
102{
103	struct wm8739_state *state = i2c_get_clientdata(client);
104
105	switch (ctrl->id) {
106	case V4L2_CID_AUDIO_MUTE:
107		ctrl->value = state->muted;
108		break;
109
110	case V4L2_CID_AUDIO_VOLUME:
111		ctrl->value = state->volume;
112		break;
113
114	case V4L2_CID_AUDIO_BALANCE:
115		ctrl->value = state->balance;
116		break;
117
118	default:
119		return -EINVAL;
120	}
121	return 0;
122}
123
124static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
125{
126	struct wm8739_state *state = i2c_get_clientdata(client);
127	unsigned int work_l, work_r;
128
129	switch (ctrl->id) {
130	case V4L2_CID_AUDIO_MUTE:
131		state->muted = ctrl->value;
132		break;
133
134	case V4L2_CID_AUDIO_VOLUME:
135		state->volume = ctrl->value;
136		break;
137
138	case V4L2_CID_AUDIO_BALANCE:
139		state->balance = ctrl->value;
140		break;
141
142	default:
143		return -EINVAL;
144	}
145
146	/* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
147	work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
148	work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
149
150	state->vol_l = (long)work_l * 31 / 65535;
151	state->vol_r = (long)work_r * 31 / 65535;
152
153	/* set audio volume etc. */
154	wm8739_set_audio(client);
155	return 0;
156}
157
158/* ------------------------------------------------------------------------ */
159
160static struct v4l2_queryctrl wm8739_qctrl[] = {
161	{
162		.id            = V4L2_CID_AUDIO_VOLUME,
163		.name          = "Volume",
164		.minimum       = 0,
165		.maximum       = 65535,
166		.step          = 65535/100,
167		.default_value = 58880,
168		.flags         = 0,
169		.type          = V4L2_CTRL_TYPE_INTEGER,
170	},{
171		.id            = V4L2_CID_AUDIO_MUTE,
172		.name          = "Mute",
173		.minimum       = 0,
174		.maximum       = 1,
175		.step          = 1,
176		.default_value = 1,
177		.flags         = 0,
178		.type          = V4L2_CTRL_TYPE_BOOLEAN,
179	},{
180		.id            = V4L2_CID_AUDIO_BALANCE,
181		.name          = "Balance",
182		.minimum       = 0,
183		.maximum       = 65535,
184		.step          = 65535/100,
185		.default_value = 32768,
186		.flags         = 0,
187		.type          = V4L2_CTRL_TYPE_INTEGER,
188	}
189};
190
191/* ------------------------------------------------------------------------ */
192
193static int wm8739_command(struct i2c_client *client, unsigned int cmd, void *arg)
194{
195	struct wm8739_state *state = i2c_get_clientdata(client);
196
197	switch (cmd) {
198	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
199	{
200		u32 audiofreq = *(u32 *)arg;
201
202		state->clock_freq = audiofreq;
203		wm8739_write(client, R9, 0x000);	/* de-activate */
204		switch (audiofreq) {
205		case 44100:
206			wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k     */
207			break;
208		case 48000:
209			wm8739_write(client, R8, 0x000); /* 256fps, fs=48k       */
210			break;
211		case 32000:
212			wm8739_write(client, R8, 0x018); /* 256fps, fs=32k       */
213			break;
214		default:
215			break;
216		}
217		wm8739_write(client, R9, 0x001);	/* activate */
218		break;
219	}
220
221	case VIDIOC_G_CTRL:
222		return wm8739_get_ctrl(client, arg);
223
224	case VIDIOC_S_CTRL:
225		return wm8739_set_ctrl(client, arg);
226
227	case VIDIOC_QUERYCTRL:
228	{
229		struct v4l2_queryctrl *qc = arg;
230		int i;
231
232		for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
233			if (qc->id && qc->id == wm8739_qctrl[i].id) {
234				memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
235				return 0;
236			}
237		return -EINVAL;
238	}
239
240	case VIDIOC_G_CHIP_IDENT:
241		return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_WM8739, 0);
242
243	case VIDIOC_LOG_STATUS:
244		v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
245		v4l_info(client, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
246				state->muted ? " (muted)" : "");
247		v4l_info(client, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
248				state->muted ? " (muted)" : "");
249		break;
250
251	default:
252		return -EINVAL;
253	}
254
255	return 0;
256}
257
258/* ------------------------------------------------------------------------ */
259
260/* i2c implementation */
261
262static struct i2c_driver i2c_driver;
263
264static int wm8739_attach(struct i2c_adapter *adapter, int address, int kind)
265{
266	struct i2c_client *client;
267	struct wm8739_state *state;
268
269	/* Check if the adapter supports the needed features */
270	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
271		return 0;
272
273	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
274	if (client == NULL)
275		return -ENOMEM;
276
277	client->addr = address;
278	client->adapter = adapter;
279	client->driver = &i2c_driver;
280	snprintf(client->name, sizeof(client->name) - 1, "wm8739");
281
282	v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
283
284	state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
285	if (state == NULL) {
286		kfree(client);
287		return -ENOMEM;
288	}
289	state->vol_l = 0x17; /* 0dB */
290	state->vol_r = 0x17; /* 0dB */
291	state->muted = 0;
292	state->balance = 32768;
293	/* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
294	state->volume = ((long)state->vol_l + 1) * 65535 / 31;
295	state->clock_freq = 48000;
296	i2c_set_clientdata(client, state);
297
298	/* initialize wm8739 */
299	wm8739_write(client, R15, 0x00); /* reset */
300	wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */
301	wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */
302	wm8739_write(client, R7, 0x049); /* Digital Audio interface format */
303					 /* Enable Master mode */
304					 /* 24 bit, MSB first/left justified */
305	wm8739_write(client, R8, 0x000); /* sampling control */
306					 /* normal, 256fs, 48KHz sampling rate */
307	wm8739_write(client, R9, 0x001); /* activate */
308	wm8739_set_audio(client); 	 /* set volume/mute */
309
310	i2c_attach_client(client);
311
312	return 0;
313}
314
315static int wm8739_probe(struct i2c_adapter *adapter)
316{
317	if (adapter->class & I2C_CLASS_TV_ANALOG)
318		return i2c_probe(adapter, &addr_data, wm8739_attach);
319	return 0;
320}
321
322static int wm8739_detach(struct i2c_client *client)
323{
324	int err;
325
326	err = i2c_detach_client(client);
327	if (err)
328		return err;
329
330	kfree(client);
331	return 0;
332}
333
334/* ----------------------------------------------------------------------- */
335
336/* i2c implementation */
337static struct i2c_driver i2c_driver = {
338	.driver = {
339		.name = "wm8739",
340	},
341	.id = I2C_DRIVERID_WM8739,
342	.attach_adapter = wm8739_probe,
343	.detach_client  = wm8739_detach,
344	.command = wm8739_command,
345};
346
347
348static int __init wm8739_init_module(void)
349{
350	return i2c_add_driver(&i2c_driver);
351}
352
353static void __exit wm8739_cleanup_module(void)
354{
355	i2c_del_driver(&i2c_driver);
356}
357
358module_init(wm8739_init_module);
359module_exit(wm8739_cleanup_module);
360