1/*
2 * cs53l32a (Adaptec AVC-2010 and AVC-2410) i2c ivtv driver.
3 * Copyright (C) 2005  Martin Vaughan
4 *
5 * Audio source switching for Adaptec AVC-2410 added by Trev Jackson
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22
23#include <linux/module.h>
24#include <linux/types.h>
25#include <linux/slab.h>
26#include <linux/ioctl.h>
27#include <asm/uaccess.h>
28#include <linux/i2c.h>
29#include <linux/videodev2.h>
30#include <media/v4l2-device.h>
31#include <media/v4l2-ctrls.h>
32
33MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
34MODULE_AUTHOR("Martin Vaughan");
35MODULE_LICENSE("GPL");
36
37static bool debug;
38
39module_param(debug, bool, 0644);
40
41MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
42
43
44struct cs53l32a_state {
45	struct v4l2_subdev sd;
46	struct v4l2_ctrl_handler hdl;
47};
48
49static inline struct cs53l32a_state *to_state(struct v4l2_subdev *sd)
50{
51	return container_of(sd, struct cs53l32a_state, sd);
52}
53
54static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
55{
56	return &container_of(ctrl->handler, struct cs53l32a_state, hdl)->sd;
57}
58
59/* ----------------------------------------------------------------------- */
60
61static int cs53l32a_write(struct v4l2_subdev *sd, u8 reg, u8 value)
62{
63	struct i2c_client *client = v4l2_get_subdevdata(sd);
64
65	return i2c_smbus_write_byte_data(client, reg, value);
66}
67
68static int cs53l32a_read(struct v4l2_subdev *sd, u8 reg)
69{
70	struct i2c_client *client = v4l2_get_subdevdata(sd);
71
72	return i2c_smbus_read_byte_data(client, reg);
73}
74
75static int cs53l32a_s_routing(struct v4l2_subdev *sd,
76			      u32 input, u32 output, u32 config)
77{
78	/* There are 2 physical inputs, but the second input can be
79	   placed in two modes, the first mode bypasses the PGA (gain),
80	   the second goes through the PGA. Hence there are three
81	   possible inputs to choose from. */
82	if (input > 2) {
83		v4l2_err(sd, "Invalid input %d.\n", input);
84		return -EINVAL;
85	}
86	cs53l32a_write(sd, 0x01, 0x01 + (input << 4));
87	return 0;
88}
89
90static int cs53l32a_s_ctrl(struct v4l2_ctrl *ctrl)
91{
92	struct v4l2_subdev *sd = to_sd(ctrl);
93
94	switch (ctrl->id) {
95	case V4L2_CID_AUDIO_MUTE:
96		cs53l32a_write(sd, 0x03, ctrl->val ? 0xf0 : 0x30);
97		return 0;
98	case V4L2_CID_AUDIO_VOLUME:
99		cs53l32a_write(sd, 0x04, (u8)ctrl->val);
100		cs53l32a_write(sd, 0x05, (u8)ctrl->val);
101		return 0;
102	}
103	return -EINVAL;
104}
105
106static int cs53l32a_log_status(struct v4l2_subdev *sd)
107{
108	struct cs53l32a_state *state = to_state(sd);
109	u8 v = cs53l32a_read(sd, 0x01);
110
111	v4l2_info(sd, "Input:  %d\n", (v >> 4) & 3);
112	v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
113	return 0;
114}
115
116/* ----------------------------------------------------------------------- */
117
118static const struct v4l2_ctrl_ops cs53l32a_ctrl_ops = {
119	.s_ctrl = cs53l32a_s_ctrl,
120};
121
122static const struct v4l2_subdev_core_ops cs53l32a_core_ops = {
123	.log_status = cs53l32a_log_status,
124	.g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
125	.try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
126	.s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
127	.g_ctrl = v4l2_subdev_g_ctrl,
128	.s_ctrl = v4l2_subdev_s_ctrl,
129	.queryctrl = v4l2_subdev_queryctrl,
130	.querymenu = v4l2_subdev_querymenu,
131};
132
133static const struct v4l2_subdev_audio_ops cs53l32a_audio_ops = {
134	.s_routing = cs53l32a_s_routing,
135};
136
137static const struct v4l2_subdev_ops cs53l32a_ops = {
138	.core = &cs53l32a_core_ops,
139	.audio = &cs53l32a_audio_ops,
140};
141
142/* ----------------------------------------------------------------------- */
143
144/* i2c implementation */
145
146/*
147 * Generic i2c probe
148 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
149 */
150
151static int cs53l32a_probe(struct i2c_client *client,
152			  const struct i2c_device_id *id)
153{
154	struct cs53l32a_state *state;
155	struct v4l2_subdev *sd;
156	int i;
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	if (!id)
163		strlcpy(client->name, "cs53l32a", sizeof(client->name));
164
165	v4l_info(client, "chip found @ 0x%x (%s)\n",
166			client->addr << 1, client->adapter->name);
167
168	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
169	if (state == NULL)
170		return -ENOMEM;
171	sd = &state->sd;
172	v4l2_i2c_subdev_init(sd, client, &cs53l32a_ops);
173
174	for (i = 1; i <= 7; i++) {
175		u8 v = cs53l32a_read(sd, i);
176
177		v4l2_dbg(1, debug, sd, "Read Reg %d %02x\n", i, v);
178	}
179
180	v4l2_ctrl_handler_init(&state->hdl, 2);
181	v4l2_ctrl_new_std(&state->hdl, &cs53l32a_ctrl_ops,
182			V4L2_CID_AUDIO_VOLUME, -96, 12, 1, 0);
183	v4l2_ctrl_new_std(&state->hdl, &cs53l32a_ctrl_ops,
184			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
185	sd->ctrl_handler = &state->hdl;
186	if (state->hdl.error) {
187		int err = state->hdl.error;
188
189		v4l2_ctrl_handler_free(&state->hdl);
190		return err;
191	}
192
193	/* Set cs53l32a internal register for Adaptec 2010/2410 setup */
194
195	cs53l32a_write(sd, 0x01, 0x21);
196	cs53l32a_write(sd, 0x02, 0x29);
197	cs53l32a_write(sd, 0x03, 0x30);
198	cs53l32a_write(sd, 0x04, 0x00);
199	cs53l32a_write(sd, 0x05, 0x00);
200	cs53l32a_write(sd, 0x06, 0x00);
201	cs53l32a_write(sd, 0x07, 0x00);
202
203	/* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
204
205	for (i = 1; i <= 7; i++) {
206		u8 v = cs53l32a_read(sd, i);
207
208		v4l2_dbg(1, debug, sd, "Read Reg %d %02x\n", i, v);
209	}
210	return 0;
211}
212
213static int cs53l32a_remove(struct i2c_client *client)
214{
215	struct v4l2_subdev *sd = i2c_get_clientdata(client);
216	struct cs53l32a_state *state = to_state(sd);
217
218	v4l2_device_unregister_subdev(sd);
219	v4l2_ctrl_handler_free(&state->hdl);
220	return 0;
221}
222
223static const struct i2c_device_id cs53l32a_id[] = {
224	{ "cs53l32a", 0 },
225	{ }
226};
227MODULE_DEVICE_TABLE(i2c, cs53l32a_id);
228
229static struct i2c_driver cs53l32a_driver = {
230	.driver = {
231		.name	= "cs53l32a",
232	},
233	.probe		= cs53l32a_probe,
234	.remove		= cs53l32a_remove,
235	.id_table	= cs53l32a_id,
236};
237
238module_i2c_driver(cs53l32a_driver);
239