Linux kernel & device driver programming

Cross-Referenced Linux and Device Driver Code

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Version: [ 2.6.11.8 ] [ 2.6.25 ] [ 2.6.25.8 ] [ 2.6.31.13 ] Architecture: [ i386 ] 
  1 /*
  2  * cs5345 Cirrus Logic 24-bit, 192 kHz Stereo Audio ADC
  3  * Copyright (C) 2007 Hans Verkuil
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License as published by
  7  * the Free Software Foundation; either version 2 of the License, or
  8  * (at your option) any later version.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 18  */
 19 
 20 
 21 #include <linux/module.h>
 22 #include <linux/kernel.h>
 23 #include <linux/i2c.h>
 24 #include <linux/videodev2.h>
 25 #include <media/v4l2-device.h>
 26 #include <media/v4l2-chip-ident.h>
 27 #include <media/v4l2-i2c-drv.h>
 28 
 29 MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
 30 MODULE_AUTHOR("Hans Verkuil");
 31 MODULE_LICENSE("GPL");
 32 
 33 static int debug;
 34 
 35 module_param(debug, bool, 0644);
 36 
 37 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
 38 
 39 
 40 /* ----------------------------------------------------------------------- */
 41 
 42 static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
 43 {
 44         struct i2c_client *client = v4l2_get_subdevdata(sd);
 45 
 46         return i2c_smbus_write_byte_data(client, reg, value);
 47 }
 48 
 49 static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
 50 {
 51         struct i2c_client *client = v4l2_get_subdevdata(sd);
 52 
 53         return i2c_smbus_read_byte_data(client, reg);
 54 }
 55 
 56 static int cs5345_s_routing(struct v4l2_subdev *sd,
 57                             u32 input, u32 output, u32 config)
 58 {
 59         if ((input & 0xf) > 6) {
 60                 v4l2_err(sd, "Invalid input %d.\n", input);
 61                 return -EINVAL;
 62         }
 63         cs5345_write(sd, 0x09, input & 0xf);
 64         cs5345_write(sd, 0x05, input & 0xf0);
 65         return 0;
 66 }
 67 
 68 static int cs5345_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 69 {
 70         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
 71                 ctrl->value = (cs5345_read(sd, 0x04) & 0x08) != 0;
 72                 return 0;
 73         }
 74         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
 75                 return -EINVAL;
 76         ctrl->value = cs5345_read(sd, 0x07) & 0x3f;
 77         if (ctrl->value >= 32)
 78                 ctrl->value = ctrl->value - 64;
 79         return 0;
 80 }
 81 
 82 static int cs5345_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
 83 {
 84         if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
 85                 cs5345_write(sd, 0x04, ctrl->value ? 0x80 : 0);
 86                 return 0;
 87         }
 88         if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
 89                 return -EINVAL;
 90         if (ctrl->value > 24 || ctrl->value < -24)
 91                 return -EINVAL;
 92         cs5345_write(sd, 0x07, ((u8)ctrl->value) & 0x3f);
 93         cs5345_write(sd, 0x08, ((u8)ctrl->value) & 0x3f);
 94         return 0;
 95 }
 96 
 97 #ifdef CONFIG_VIDEO_ADV_DEBUG
 98 static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 99 {
100         struct i2c_client *client = v4l2_get_subdevdata(sd);
101 
102         if (!v4l2_chip_match_i2c_client(client, &reg->match))
103                 return -EINVAL;
104         if (!capable(CAP_SYS_ADMIN))
105                 return -EPERM;
106         reg->size = 1;
107         reg->val = cs5345_read(sd, reg->reg & 0x1f);
108         return 0;
109 }
110 
111 static int cs5345_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
112 {
113         struct i2c_client *client = v4l2_get_subdevdata(sd);
114 
115         if (!v4l2_chip_match_i2c_client(client, &reg->match))
116                 return -EINVAL;
117         if (!capable(CAP_SYS_ADMIN))
118                 return -EPERM;
119         cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
120         return 0;
121 }
122 #endif
123 
124 static int cs5345_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
125 {
126         struct i2c_client *client = v4l2_get_subdevdata(sd);
127 
128         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_CS5345, 0);
129 }
130 
131 static int cs5345_log_status(struct v4l2_subdev *sd)
132 {
133         u8 v = cs5345_read(sd, 0x09) & 7;
134         u8 m = cs5345_read(sd, 0x04);
135         int vol = cs5345_read(sd, 0x08) & 0x3f;
136 
137         v4l2_info(sd, "Input:  %d%s\n", v,
138                         (m & 0x80) ? " (muted)" : "");
139         if (vol >= 32)
140                 vol = vol - 64;
141         v4l2_info(sd, "Volume: %d dB\n", vol);
142         return 0;
143 }
144 
145 /* ----------------------------------------------------------------------- */
146 
147 static const struct v4l2_subdev_core_ops cs5345_core_ops = {
148         .log_status = cs5345_log_status,
149         .g_chip_ident = cs5345_g_chip_ident,
150         .g_ctrl = cs5345_g_ctrl,
151         .s_ctrl = cs5345_s_ctrl,
152 #ifdef CONFIG_VIDEO_ADV_DEBUG
153         .g_register = cs5345_g_register,
154         .s_register = cs5345_s_register,
155 #endif
156 };
157 
158 static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
159         .s_routing = cs5345_s_routing,
160 };
161 
162 static const struct v4l2_subdev_ops cs5345_ops = {
163         .core = &cs5345_core_ops,
164         .audio = &cs5345_audio_ops,
165 };
166 
167 /* ----------------------------------------------------------------------- */
168 
169 static int cs5345_probe(struct i2c_client *client,
170                         const struct i2c_device_id *id)
171 {
172         struct v4l2_subdev *sd;
173 
174         /* Check if the adapter supports the needed features */
175         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
176                 return -EIO;
177 
178         v4l_info(client, "chip found @ 0x%x (%s)\n",
179                         client->addr << 1, client->adapter->name);
180 
181         sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
182         if (sd == NULL)
183                 return -ENOMEM;
184         v4l2_i2c_subdev_init(sd, client, &cs5345_ops);
185 
186         cs5345_write(sd, 0x02, 0x00);
187         cs5345_write(sd, 0x04, 0x01);
188         cs5345_write(sd, 0x09, 0x01);
189         return 0;
190 }
191 
192 /* ----------------------------------------------------------------------- */
193 
194 static int cs5345_remove(struct i2c_client *client)
195 {
196         struct v4l2_subdev *sd = i2c_get_clientdata(client);
197 
198         v4l2_device_unregister_subdev(sd);
199         kfree(sd);
200         return 0;
201 }
202 
203 /* ----------------------------------------------------------------------- */
204 
205 static const struct i2c_device_id cs5345_id[] = {
206         { "cs5345", 0 },
207         { }
208 };
209 MODULE_DEVICE_TABLE(i2c, cs5345_id);
210 
211 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
212         .name = "cs5345",
213         .probe = cs5345_probe,
214         .remove = cs5345_remove,
215         .id_table = cs5345_id,
216 };
217
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