1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * cs5345 Cirrus Logic 24-bit, 192 kHz Stereo Audio ADC
  4 * Copyright (C) 2007 Hans Verkuil
  5 */
  6
  7
  8#include <linux/module.h>
  9#include <linux/kernel.h>
 10#include <linux/i2c.h>
 11#include <linux/videodev2.h>
 12#include <linux/slab.h>
 13#include <media/v4l2-device.h>
 14#include <media/v4l2-ctrls.h>
 15
 16MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
 17MODULE_AUTHOR("Hans Verkuil");
 18MODULE_LICENSE("GPL");
 19
 20static bool debug;
 21
 22module_param(debug, bool, 0644);
 23
 24MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
 25
 26struct cs5345_state {
 27	struct v4l2_subdev sd;
 28	struct v4l2_ctrl_handler hdl;
 29};
 30
 31static inline struct cs5345_state *to_state(struct v4l2_subdev *sd)
 32{
 33	return container_of(sd, struct cs5345_state, sd);
 34}
 35
 36static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
 37{
 38	return &container_of(ctrl->handler, struct cs5345_state, hdl)->sd;
 39}
 40
 41/* ----------------------------------------------------------------------- */
 42
 43static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
 44{
 45	struct i2c_client *client = v4l2_get_subdevdata(sd);
 46
 47	return i2c_smbus_write_byte_data(client, reg, value);
 48}
 49
 50static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
 51{
 52	struct i2c_client *client = v4l2_get_subdevdata(sd);
 53
 54	return i2c_smbus_read_byte_data(client, reg);
 55}
 56
 57static int cs5345_s_routing(struct v4l2_subdev *sd,
 58			    u32 input, u32 output, u32 config)
 59{
 60	if ((input & 0xf) > 6) {
 61		v4l2_err(sd, "Invalid input %d.\n", input);
 62		return -EINVAL;
 63	}
 64	cs5345_write(sd, 0x09, input & 0xf);
 65	cs5345_write(sd, 0x05, input & 0xf0);
 66	return 0;
 67}
 68
 69static int cs5345_s_ctrl(struct v4l2_ctrl *ctrl)
 70{
 71	struct v4l2_subdev *sd = to_sd(ctrl);
 72
 73	switch (ctrl->id) {
 74	case V4L2_CID_AUDIO_MUTE:
 75		cs5345_write(sd, 0x04, ctrl->val ? 0x80 : 0);
 76		return 0;
 77	case V4L2_CID_AUDIO_VOLUME:
 78		cs5345_write(sd, 0x07, ((u8)ctrl->val) & 0x3f);
 79		cs5345_write(sd, 0x08, ((u8)ctrl->val) & 0x3f);
 80		return 0;
 81	}
 82	return -EINVAL;
 83}
 84
 85#ifdef CONFIG_VIDEO_ADV_DEBUG
 86static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 87{
 88	reg->size = 1;
 89	reg->val = cs5345_read(sd, reg->reg & 0x1f);
 90	return 0;
 91}
 92
 93static int cs5345_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
 94{
 95	cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
 96	return 0;
 97}
 98#endif
 99
100static int cs5345_log_status(struct v4l2_subdev *sd)
101{
102	u8 v = cs5345_read(sd, 0x09) & 7;
103	u8 m = cs5345_read(sd, 0x04);
104	int vol = cs5345_read(sd, 0x08) & 0x3f;
105
106	v4l2_info(sd, "Input:  %d%s\n", v,
107			(m & 0x80) ? " (muted)" : "");
108	if (vol >= 32)
109		vol = vol - 64;
110	v4l2_info(sd, "Volume: %d dB\n", vol);
111	return 0;
112}
113
114/* ----------------------------------------------------------------------- */
115
116static const struct v4l2_ctrl_ops cs5345_ctrl_ops = {
117	.s_ctrl = cs5345_s_ctrl,
118};
119
120static const struct v4l2_subdev_core_ops cs5345_core_ops = {
121	.log_status = cs5345_log_status,
122#ifdef CONFIG_VIDEO_ADV_DEBUG
123	.g_register = cs5345_g_register,
124	.s_register = cs5345_s_register,
125#endif
126};
127
128static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
129	.s_routing = cs5345_s_routing,
130};
131
132static const struct v4l2_subdev_ops cs5345_ops = {
133	.core = &cs5345_core_ops,
134	.audio = &cs5345_audio_ops,
135};
136
137/* ----------------------------------------------------------------------- */
138
139static int cs5345_probe(struct i2c_client *client)
140{
141	struct cs5345_state *state;
142	struct v4l2_subdev *sd;
143
144	/* Check if the adapter supports the needed features */
145	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
146		return -EIO;
147
148	v4l_info(client, "chip found @ 0x%x (%s)\n",
149			client->addr << 1, client->adapter->name);
150
151	state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
152	if (state == NULL)
153		return -ENOMEM;
154	sd = &state->sd;
155	v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
156
157	v4l2_ctrl_handler_init(&state->hdl, 2);
158	v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
159			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
160	v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
161			V4L2_CID_AUDIO_VOLUME, -24, 24, 1, 0);
162	sd->ctrl_handler = &state->hdl;
163	if (state->hdl.error) {
164		int err = state->hdl.error;
165
166		v4l2_ctrl_handler_free(&state->hdl);
167		return err;
168	}
169	/* set volume/mute */
170	v4l2_ctrl_handler_setup(&state->hdl);
171
172	cs5345_write(sd, 0x02, 0x00);
173	cs5345_write(sd, 0x04, 0x01);
174	cs5345_write(sd, 0x09, 0x01);
175	return 0;
176}
177
178/* ----------------------------------------------------------------------- */
179
180static void cs5345_remove(struct i2c_client *client)
181{
182	struct v4l2_subdev *sd = i2c_get_clientdata(client);
183	struct cs5345_state *state = to_state(sd);
184
185	v4l2_device_unregister_subdev(sd);
186	v4l2_ctrl_handler_free(&state->hdl);
187}
188
189/* ----------------------------------------------------------------------- */
190
191static const struct i2c_device_id cs5345_id[] = {
192	{ "cs5345", 0 },
193	{ }
194};
195MODULE_DEVICE_TABLE(i2c, cs5345_id);
196
197static struct i2c_driver cs5345_driver = {
198	.driver = {
199		.name	= "cs5345",
200	},
201	.probe		= cs5345_probe,
202	.remove		= cs5345_remove,
203	.id_table	= cs5345_id,
204};
205
206module_i2c_driver(cs5345_driver);