xref: /openbmc/linux/drivers/media/i2c/cs53l32a.c (revision aaeb31c0)
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 
20 MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
21 MODULE_AUTHOR("Martin Vaughan");
22 MODULE_LICENSE("GPL");
23 
24 static bool debug;
25 
26 module_param(debug, bool, 0644);
27 
28 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
29 
30 
31 struct cs53l32a_state {
32 	struct v4l2_subdev sd;
33 	struct v4l2_ctrl_handler hdl;
34 };
35 
to_state(struct v4l2_subdev * sd)36 static inline struct cs53l32a_state *to_state(struct v4l2_subdev *sd)
37 {
38 	return container_of(sd, struct cs53l32a_state, sd);
39 }
40 
to_sd(struct v4l2_ctrl * ctrl)41 static 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 
cs53l32a_write(struct v4l2_subdev * sd,u8 reg,u8 value)48 static 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 
cs53l32a_read(struct v4l2_subdev * sd,u8 reg)55 static 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 
cs53l32a_s_routing(struct v4l2_subdev * sd,u32 input,u32 output,u32 config)62 static 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 
cs53l32a_s_ctrl(struct v4l2_ctrl * ctrl)77 static 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 
cs53l32a_log_status(struct v4l2_subdev * sd)93 static 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 
105 static const struct v4l2_ctrl_ops cs53l32a_ctrl_ops = {
106 	.s_ctrl = cs53l32a_s_ctrl,
107 };
108 
109 static const struct v4l2_subdev_core_ops cs53l32a_core_ops = {
110 	.log_status = cs53l32a_log_status,
111 };
112 
113 static const struct v4l2_subdev_audio_ops cs53l32a_audio_ops = {
114 	.s_routing = cs53l32a_s_routing,
115 };
116 
117 static 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 
cs53l32a_probe(struct i2c_client * client)131 static 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 
cs53l32a_remove(struct i2c_client * client)193 static 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 
202 static const struct i2c_device_id cs53l32a_id[] = {
203 	{ "cs53l32a", 0 },
204 	{ }
205 };
206 MODULE_DEVICE_TABLE(i2c, cs53l32a_id);
207 
208 static 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 
217 module_i2c_driver(cs53l32a_driver);
218