These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / drivers / media / i2c / tlv320aic23b.c
1 /*
2  * tlv320aic23b - driver version 0.0.1
3  *
4  * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
5  *
6  * Based on wm8775 driver
7  *
8  * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
9  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25
26 #include <linux/module.h>
27 #include <linux/types.h>
28 #include <linux/slab.h>
29 #include <linux/ioctl.h>
30 #include <asm/uaccess.h>
31 #include <linux/i2c.h>
32 #include <linux/videodev2.h>
33 #include <media/v4l2-device.h>
34 #include <media/v4l2-ctrls.h>
35
36 MODULE_DESCRIPTION("tlv320aic23b driver");
37 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
38 MODULE_LICENSE("GPL");
39
40
41 /* ----------------------------------------------------------------------- */
42
43 struct tlv320aic23b_state {
44         struct v4l2_subdev sd;
45         struct v4l2_ctrl_handler hdl;
46 };
47
48 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
49 {
50         return container_of(sd, struct tlv320aic23b_state, sd);
51 }
52
53 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
54 {
55         return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
56 }
57
58 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
59 {
60         struct i2c_client *client = v4l2_get_subdevdata(sd);
61         int i;
62
63         if ((reg < 0 || reg > 9) && (reg != 15)) {
64                 v4l2_err(sd, "Invalid register R%d\n", reg);
65                 return -1;
66         }
67
68         for (i = 0; i < 3; i++)
69                 if (i2c_smbus_write_byte_data(client,
70                                 (reg << 1) | (val >> 8), val & 0xff) == 0)
71                         return 0;
72         v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
73         return -1;
74 }
75
76 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
77 {
78         switch (freq) {
79         case 32000: /* set sample rate to 32 kHz */
80                 tlv320aic23b_write(sd, 8, 0x018);
81                 break;
82         case 44100: /* set sample rate to 44.1 kHz */
83                 tlv320aic23b_write(sd, 8, 0x022);
84                 break;
85         case 48000: /* set sample rate to 48 kHz */
86                 tlv320aic23b_write(sd, 8, 0x000);
87                 break;
88         default:
89                 return -EINVAL;
90         }
91         return 0;
92 }
93
94 static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
95 {
96         struct v4l2_subdev *sd = to_sd(ctrl);
97
98         switch (ctrl->id) {
99         case V4L2_CID_AUDIO_MUTE:
100                 tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
101                 /* set gain on both channels to +3.0 dB */
102                 if (!ctrl->val)
103                         tlv320aic23b_write(sd, 0, 0x119);
104                 return 0;
105         }
106         return -EINVAL;
107 }
108
109 static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
110 {
111         struct tlv320aic23b_state *state = to_state(sd);
112
113         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
114         return 0;
115 }
116
117 /* ----------------------------------------------------------------------- */
118
119 static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
120         .s_ctrl = tlv320aic23b_s_ctrl,
121 };
122
123 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
124         .log_status = tlv320aic23b_log_status,
125 };
126
127 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
128         .s_clock_freq = tlv320aic23b_s_clock_freq,
129 };
130
131 static const struct v4l2_subdev_ops tlv320aic23b_ops = {
132         .core = &tlv320aic23b_core_ops,
133         .audio = &tlv320aic23b_audio_ops,
134 };
135
136 /* ----------------------------------------------------------------------- */
137
138 /* i2c implementation */
139
140 /*
141  * Generic i2c probe
142  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
143  */
144
145 static int tlv320aic23b_probe(struct i2c_client *client,
146                               const struct i2c_device_id *id)
147 {
148         struct tlv320aic23b_state *state;
149         struct v4l2_subdev *sd;
150
151         /* Check if the adapter supports the needed features */
152         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
153                 return -EIO;
154
155         v4l_info(client, "chip found @ 0x%x (%s)\n",
156                         client->addr << 1, client->adapter->name);
157
158         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
159         if (state == NULL)
160                 return -ENOMEM;
161         sd = &state->sd;
162         v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
163
164         /* Initialize tlv320aic23b */
165
166         /* RESET */
167         tlv320aic23b_write(sd, 15, 0x000);
168         /* turn off DAC & mic input */
169         tlv320aic23b_write(sd, 6, 0x00A);
170         /* left-justified, 24-bit, master mode */
171         tlv320aic23b_write(sd, 7, 0x049);
172         /* set gain on both channels to +3.0 dB */
173         tlv320aic23b_write(sd, 0, 0x119);
174         /* set sample rate to 48 kHz */
175         tlv320aic23b_write(sd, 8, 0x000);
176         /* activate digital interface */
177         tlv320aic23b_write(sd, 9, 0x001);
178
179         v4l2_ctrl_handler_init(&state->hdl, 1);
180         v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
181                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
182         sd->ctrl_handler = &state->hdl;
183         if (state->hdl.error) {
184                 int err = state->hdl.error;
185
186                 v4l2_ctrl_handler_free(&state->hdl);
187                 return err;
188         }
189         v4l2_ctrl_handler_setup(&state->hdl);
190         return 0;
191 }
192
193 static int tlv320aic23b_remove(struct i2c_client *client)
194 {
195         struct v4l2_subdev *sd = i2c_get_clientdata(client);
196         struct tlv320aic23b_state *state = to_state(sd);
197
198         v4l2_device_unregister_subdev(sd);
199         v4l2_ctrl_handler_free(&state->hdl);
200         return 0;
201 }
202
203 /* ----------------------------------------------------------------------- */
204
205 static const struct i2c_device_id tlv320aic23b_id[] = {
206         { "tlv320aic23b", 0 },
207         { }
208 };
209 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
210
211 static struct i2c_driver tlv320aic23b_driver = {
212         .driver = {
213                 .owner  = THIS_MODULE,
214                 .name   = "tlv320aic23b",
215         },
216         .probe          = tlv320aic23b_probe,
217         .remove         = tlv320aic23b_remove,
218         .id_table       = tlv320aic23b_id,
219 };
220
221 module_i2c_driver(tlv320aic23b_driver);