1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * cs53l32a (Adaptec AVC-2010 and AVC-2410) i2c ivtv driver.
4 * Copyright (C) 2005  Martin Vaughan
5 *
6 * Audio source switching for Adaptec AVC-2410 added by Trev Jackson
7 */
8
9
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/slab.h>
13#include <linux/ioctl.h>
14#include <linux/uaccess.h>
15#include <linux/i2c.h>
16#include <linux/videodev2.h>
17#include <media/v4l2-device.h>
18#include <media/v4l2-ctrls.h>
19
20MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
21MODULE_AUTHOR("Martin Vaughan");
22MODULE_LICENSE("GPL");
23
24static bool debug;
25
26module_param(debug, bool, 0644);
27
28MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
29
30
31struct cs53l32a_state {
32	struct v4l2_subdev sd;
33	struct v4l2_ctrl_handler hdl;
34};
35
36static inline struct cs53l32a_state *to_state(struct v4l2_subdev *sd)
37{
38	return container_of(sd, struct cs53l32a_state, sd);
39}
40
41static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
42{
43	return &container_of(ctrl->handler, struct cs53l32a_state, hdl)->sd;
44}
45
46/* ----------------------------------------------------------------------- */
47
48static int cs53l32a_write(struct v4l2_subdev *sd, u8 reg, u8 value)
49{
50	struct i2c_client *client = v4l2_get_subdevdata(sd);
51
52	return i2c_smbus_write_byte_data(client, reg, value);
53}
54
55static int cs53l32a_read(struct v4l2_subdev *sd, u8 reg)
56{
57	struct i2c_client *client = v4l2_get_subdevdata(sd);
58
59	return i2c_smbus_read_byte_data(client, reg);
60}
61
62static int cs53l32a_s_routing(struct v4l2_subdev *sd,
63			      u32 input, u32 output, u32 config)
64{
65	/* There are 2 physical inputs, but the second input can be
66	   placed in two modes, the first mode bypasses the PGA (gain),
67	   the second goes through the PGA. Hence there are three
68	   possible inputs to choose from. */
69	if (input > 2) {
70		v4l2_err(sd, "Invalid input %d.\n", input);
71		return -EINVAL;
72	}
73	cs53l32a_write(sd, 0x01, 0x01 + (input << 4));
74	return 0;
75}
76
77static int cs53l32a_s_ctrl(struct v4l2_ctrl *ctrl)
78{
79	struct v4l2_subdev *sd = to_sd(ctrl);
80
81	switch (ctrl->id) {
82	case V4L2_CID_AUDIO_MUTE:
83		cs53l32a_write(sd, 0x03, ctrl->val ? 0xf0 : 0x30);
84		return 0;
85	case V4L2_CID_AUDIO_VOLUME:
86		cs53l32a_write(sd, 0x04, (u8)ctrl->val);
87		cs53l32a_write(sd, 0x05, (u8)ctrl->val);
88		return 0;
89	}
90	return -EINVAL;
91}
92
93static int cs53l32a_log_status(struct v4l2_subdev *sd)
94{
95	struct cs53l32a_state *state = to_state(sd);
96	u8 v = cs53l32a_read(sd, 0x01);
97
98	v4l2_info(sd, "Input:  %d\n", (v >> 4) & 3);
99	v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
100	return 0;
101}
102
103/* ----------------------------------------------------------------------- */
104
105static const struct v4l2_ctrl_ops cs53l32a_ctrl_ops = {
106	.s_ctrl = cs53l32a_s_ctrl,
107};
108
109static const struct v4l2_subdev_core_ops cs53l32a_core_ops = {
110	.log_status = cs53l32a_log_status,
111};
112
113static const struct v4l2_subdev_audio_ops cs53l32a_audio_ops = {
114	.s_routing = cs53l32a_s_routing,
115};
116
117static const struct v4l2_subdev_ops cs53l32a_ops = {
118	.core = &cs53l32a_core_ops,
119	.audio = &cs53l32a_audio_ops,
120};
121
122/* ----------------------------------------------------------------------- */
123
124/* i2c implementation */
125
126/*
127 * Generic i2c probe
128 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
129 */
130
131static int cs53l32a_probe(struct i2c_client *client)
132{
133	const struct i2c_device_id *id = i2c_client_get_device_id(client);
134	struct cs53l32a_state *state;
135	struct v4l2_subdev *sd;
136	int i;
137
138	/* Check if the adapter supports the needed features */
139	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
140		return -EIO;
141
142	if (!id)
143		strscpy(client->name, "cs53l32a", sizeof(client->name));
144
145	v4l_info(client, "chip found @ 0x%x (%s)\n",
146			client->addr << 1, client->adapter->name);
147
148	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
149	if (state == NULL)
150		return -ENOMEM;
151	sd = &state->sd;
152	v4l2_i2c_subdev_init(sd, client, &cs53l32a_ops);
153
154	for (i = 1; i <= 7; i++) {
155		u8 v = cs53l32a_read(sd, i);
156
157		v4l2_dbg(1, debug, sd, "Read Reg %d %02x\n", i, v);
158	}
159
160	v4l2_ctrl_handler_init(&state->hdl, 2);
161	v4l2_ctrl_new_std(&state->hdl, &cs53l32a_ctrl_ops,
162			V4L2_CID_AUDIO_VOLUME, -96, 12, 1, 0);
163	v4l2_ctrl_new_std(&state->hdl, &cs53l32a_ctrl_ops,
164			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
165	sd->ctrl_handler = &state->hdl;
166	if (state->hdl.error) {
167		int err = state->hdl.error;
168
169		v4l2_ctrl_handler_free(&state->hdl);
170		return err;
171	}
172
173	/* Set cs53l32a internal register for Adaptec 2010/2410 setup */
174
175	cs53l32a_write(sd, 0x01, 0x21);
176	cs53l32a_write(sd, 0x02, 0x29);
177	cs53l32a_write(sd, 0x03, 0x30);
178	cs53l32a_write(sd, 0x04, 0x00);
179	cs53l32a_write(sd, 0x05, 0x00);
180	cs53l32a_write(sd, 0x06, 0x00);
181	cs53l32a_write(sd, 0x07, 0x00);
182
183	/* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
184
185	for (i = 1; i <= 7; i++) {
186		u8 v = cs53l32a_read(sd, i);
187
188		v4l2_dbg(1, debug, sd, "Read Reg %d %02x\n", i, v);
189	}
190	return 0;
191}
192
193static void cs53l32a_remove(struct i2c_client *client)
194{
195	struct v4l2_subdev *sd = i2c_get_clientdata(client);
196	struct cs53l32a_state *state = to_state(sd);
197
198	v4l2_device_unregister_subdev(sd);
199	v4l2_ctrl_handler_free(&state->hdl);
200}
201
202static const struct i2c_device_id cs53l32a_id[] = {
203	{ "cs53l32a", 0 },
204	{ }
205};
206MODULE_DEVICE_TABLE(i2c, cs53l32a_id);
207
208static struct i2c_driver cs53l32a_driver = {
209	.driver = {
210		.name	= "cs53l32a",
211	},
212	.probe		= cs53l32a_probe,
213	.remove		= cs53l32a_remove,
214	.id_table	= cs53l32a_id,
215};
216
217module_i2c_driver(cs53l32a_driver);
218