1/*
2 * cs5345 Cirrus Logic 24-bit, 192 kHz Stereo Audio ADC
3 * Copyright (C) 2007 Hans Verkuil
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20
21#include <linux/module.h>
22#include <linux/kernel.h>
23#include <linux/i2c.h>
24#include <linux/videodev2.h>
25#include <linux/slab.h>
26#include <media/v4l2-device.h>
27#include <media/v4l2-ctrls.h>
28
29MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
30MODULE_AUTHOR("Hans Verkuil");
31MODULE_LICENSE("GPL");
32
33static bool debug;
34
35module_param(debug, bool, 0644);
36
37MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
38
39struct cs5345_state {
40	struct v4l2_subdev sd;
41	struct v4l2_ctrl_handler hdl;
42};
43
44static inline struct cs5345_state *to_state(struct v4l2_subdev *sd)
45{
46	return container_of(sd, struct cs5345_state, sd);
47}
48
49static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
50{
51	return &container_of(ctrl->handler, struct cs5345_state, hdl)->sd;
52}
53
54/* ----------------------------------------------------------------------- */
55
56static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
57{
58	struct i2c_client *client = v4l2_get_subdevdata(sd);
59
60	return i2c_smbus_write_byte_data(client, reg, value);
61}
62
63static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
64{
65	struct i2c_client *client = v4l2_get_subdevdata(sd);
66
67	return i2c_smbus_read_byte_data(client, reg);
68}
69
70static int cs5345_s_routing(struct v4l2_subdev *sd,
71			    u32 input, u32 output, u32 config)
72{
73	if ((input & 0xf) > 6) {
74		v4l2_err(sd, "Invalid input %d.\n", input);
75		return -EINVAL;
76	}
77	cs5345_write(sd, 0x09, input & 0xf);
78	cs5345_write(sd, 0x05, input & 0xf0);
79	return 0;
80}
81
82static int cs5345_s_ctrl(struct v4l2_ctrl *ctrl)
83{
84	struct v4l2_subdev *sd = to_sd(ctrl);
85
86	switch (ctrl->id) {
87	case V4L2_CID_AUDIO_MUTE:
88		cs5345_write(sd, 0x04, ctrl->val ? 0x80 : 0);
89		return 0;
90	case V4L2_CID_AUDIO_VOLUME:
91		cs5345_write(sd, 0x07, ((u8)ctrl->val) & 0x3f);
92		cs5345_write(sd, 0x08, ((u8)ctrl->val) & 0x3f);
93		return 0;
94	}
95	return -EINVAL;
96}
97
98#ifdef CONFIG_VIDEO_ADV_DEBUG
99static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
100{
101	reg->size = 1;
102	reg->val = cs5345_read(sd, reg->reg & 0x1f);
103	return 0;
104}
105
106static int cs5345_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
107{
108	cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
109	return 0;
110}
111#endif
112
113static int cs5345_log_status(struct v4l2_subdev *sd)
114{
115	u8 v = cs5345_read(sd, 0x09) & 7;
116	u8 m = cs5345_read(sd, 0x04);
117	int vol = cs5345_read(sd, 0x08) & 0x3f;
118
119	v4l2_info(sd, "Input:  %d%s\n", v,
120			(m & 0x80) ? " (muted)" : "");
121	if (vol >= 32)
122		vol = vol - 64;
123	v4l2_info(sd, "Volume: %d dB\n", vol);
124	return 0;
125}
126
127/* ----------------------------------------------------------------------- */
128
129static const struct v4l2_ctrl_ops cs5345_ctrl_ops = {
130	.s_ctrl = cs5345_s_ctrl,
131};
132
133static const struct v4l2_subdev_core_ops cs5345_core_ops = {
134	.log_status = cs5345_log_status,
135#ifdef CONFIG_VIDEO_ADV_DEBUG
136	.g_register = cs5345_g_register,
137	.s_register = cs5345_s_register,
138#endif
139};
140
141static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
142	.s_routing = cs5345_s_routing,
143};
144
145static const struct v4l2_subdev_ops cs5345_ops = {
146	.core = &cs5345_core_ops,
147	.audio = &cs5345_audio_ops,
148};
149
150/* ----------------------------------------------------------------------- */
151
152static int cs5345_probe(struct i2c_client *client,
153			const struct i2c_device_id *id)
154{
155	struct cs5345_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, &cs5345_ops);
170
171	v4l2_ctrl_handler_init(&state->hdl, 2);
172	v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
173			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
174	v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
175			V4L2_CID_AUDIO_VOLUME, -24, 24, 1, 0);
176	sd->ctrl_handler = &state->hdl;
177	if (state->hdl.error) {
178		int err = state->hdl.error;
179
180		v4l2_ctrl_handler_free(&state->hdl);
181		return err;
182	}
183	/* set volume/mute */
184	v4l2_ctrl_handler_setup(&state->hdl);
185
186	cs5345_write(sd, 0x02, 0x00);
187	cs5345_write(sd, 0x04, 0x01);
188	cs5345_write(sd, 0x09, 0x01);
189	return 0;
190}
191
192/* ----------------------------------------------------------------------- */
193
194static int cs5345_remove(struct i2c_client *client)
195{
196	struct v4l2_subdev *sd = i2c_get_clientdata(client);
197	struct cs5345_state *state = to_state(sd);
198
199	v4l2_device_unregister_subdev(sd);
200	v4l2_ctrl_handler_free(&state->hdl);
201	return 0;
202}
203
204/* ----------------------------------------------------------------------- */
205
206static const struct i2c_device_id cs5345_id[] = {
207	{ "cs5345", 0 },
208	{ }
209};
210MODULE_DEVICE_TABLE(i2c, cs5345_id);
211
212static struct i2c_driver cs5345_driver = {
213	.driver = {
214		.name	= "cs5345",
215	},
216	.probe		= cs5345_probe,
217	.remove		= cs5345_remove,
218	.id_table	= cs5345_id,
219};
220
221module_i2c_driver(cs5345_driver);
222