1/*
2 * tlv320aic23b - driver version 0.0.1
3 *
4 * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
5 *
6 * Based on wm8775 driver
7 *
8 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
9 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#include <linux/module.h>
27#include <linux/types.h>
28#include <linux/slab.h>
29#include <linux/ioctl.h>
30#include <asm/uaccess.h>
31#include <linux/i2c.h>
32#include <linux/videodev2.h>
33#include <media/v4l2-device.h>
34#include <media/v4l2-ctrls.h>
35
36MODULE_DESCRIPTION("tlv320aic23b driver");
37MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
38MODULE_LICENSE("GPL");
39
40
41/* ----------------------------------------------------------------------- */
42
43struct tlv320aic23b_state {
44	struct v4l2_subdev sd;
45	struct v4l2_ctrl_handler hdl;
46};
47
48static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
49{
50	return container_of(sd, struct tlv320aic23b_state, sd);
51}
52
53static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
54{
55	return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
56}
57
58static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
59{
60	struct i2c_client *client = v4l2_get_subdevdata(sd);
61	int i;
62
63	if ((reg < 0 || reg > 9) && (reg != 15)) {
64		v4l2_err(sd, "Invalid register R%d\n", reg);
65		return -1;
66	}
67
68	for (i = 0; i < 3; i++)
69		if (i2c_smbus_write_byte_data(client,
70				(reg << 1) | (val >> 8), val & 0xff) == 0)
71			return 0;
72	v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
73	return -1;
74}
75
76static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
77{
78	switch (freq) {
79	case 32000: /* set sample rate to 32 kHz */
80		tlv320aic23b_write(sd, 8, 0x018);
81		break;
82	case 44100: /* set sample rate to 44.1 kHz */
83		tlv320aic23b_write(sd, 8, 0x022);
84		break;
85	case 48000: /* set sample rate to 48 kHz */
86		tlv320aic23b_write(sd, 8, 0x000);
87		break;
88	default:
89		return -EINVAL;
90	}
91	return 0;
92}
93
94static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
95{
96	struct v4l2_subdev *sd = to_sd(ctrl);
97
98	switch (ctrl->id) {
99	case V4L2_CID_AUDIO_MUTE:
100		tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
101		/* set gain on both channels to +3.0 dB */
102		if (!ctrl->val)
103			tlv320aic23b_write(sd, 0, 0x119);
104		return 0;
105	}
106	return -EINVAL;
107}
108
109static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
110{
111	struct tlv320aic23b_state *state = to_state(sd);
112
113	v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
114	return 0;
115}
116
117/* ----------------------------------------------------------------------- */
118
119static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
120	.s_ctrl = tlv320aic23b_s_ctrl,
121};
122
123static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
124	.log_status = tlv320aic23b_log_status,
125	.g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
126	.try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
127	.s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
128	.g_ctrl = v4l2_subdev_g_ctrl,
129	.s_ctrl = v4l2_subdev_s_ctrl,
130	.queryctrl = v4l2_subdev_queryctrl,
131	.querymenu = v4l2_subdev_querymenu,
132};
133
134static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
135	.s_clock_freq = tlv320aic23b_s_clock_freq,
136};
137
138static const struct v4l2_subdev_ops tlv320aic23b_ops = {
139	.core = &tlv320aic23b_core_ops,
140	.audio = &tlv320aic23b_audio_ops,
141};
142
143/* ----------------------------------------------------------------------- */
144
145/* i2c implementation */
146
147/*
148 * Generic i2c probe
149 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
150 */
151
152static int tlv320aic23b_probe(struct i2c_client *client,
153			      const struct i2c_device_id *id)
154{
155	struct tlv320aic23b_state *state;
156	struct v4l2_subdev *sd;
157
158	/* Check if the adapter supports the needed features */
159	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
160		return -EIO;
161
162	v4l_info(client, "chip found @ 0x%x (%s)\n",
163			client->addr << 1, client->adapter->name);
164
165	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
166	if (state == NULL)
167		return -ENOMEM;
168	sd = &state->sd;
169	v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
170
171	/* Initialize tlv320aic23b */
172
173	/* RESET */
174	tlv320aic23b_write(sd, 15, 0x000);
175	/* turn off DAC & mic input */
176	tlv320aic23b_write(sd, 6, 0x00A);
177	/* left-justified, 24-bit, master mode */
178	tlv320aic23b_write(sd, 7, 0x049);
179	/* set gain on both channels to +3.0 dB */
180	tlv320aic23b_write(sd, 0, 0x119);
181	/* set sample rate to 48 kHz */
182	tlv320aic23b_write(sd, 8, 0x000);
183	/* activate digital interface */
184	tlv320aic23b_write(sd, 9, 0x001);
185
186	v4l2_ctrl_handler_init(&state->hdl, 1);
187	v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
188			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
189	sd->ctrl_handler = &state->hdl;
190	if (state->hdl.error) {
191		int err = state->hdl.error;
192
193		v4l2_ctrl_handler_free(&state->hdl);
194		return err;
195	}
196	v4l2_ctrl_handler_setup(&state->hdl);
197	return 0;
198}
199
200static int tlv320aic23b_remove(struct i2c_client *client)
201{
202	struct v4l2_subdev *sd = i2c_get_clientdata(client);
203	struct tlv320aic23b_state *state = to_state(sd);
204
205	v4l2_device_unregister_subdev(sd);
206	v4l2_ctrl_handler_free(&state->hdl);
207	return 0;
208}
209
210/* ----------------------------------------------------------------------- */
211
212static const struct i2c_device_id tlv320aic23b_id[] = {
213	{ "tlv320aic23b", 0 },
214	{ }
215};
216MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
217
218static struct i2c_driver tlv320aic23b_driver = {
219	.driver = {
220		.owner	= THIS_MODULE,
221		.name	= "tlv320aic23b",
222	},
223	.probe		= tlv320aic23b_probe,
224	.remove		= tlv320aic23b_remove,
225	.id_table	= tlv320aic23b_id,
226};
227
228module_i2c_driver(tlv320aic23b_driver);
229