Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
wm8739.c
Go to the documentation of this file.
1 /*
2  * wm8739
3  *
4  * Copyright (C) 2005 T. Adachi <[email protected]>
5  *
6  * Copyright (C) 2005 Hans Verkuil <[email protected]>
7  * - Cleanup
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22  */
23 
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/slab.h>
27 #include <linux/ioctl.h>
28 #include <asm/uaccess.h>
29 #include <linux/i2c.h>
30 #include <linux/videodev2.h>
31 #include <media/v4l2-device.h>
32 #include <media/v4l2-chip-ident.h>
33 #include <media/v4l2-ctrls.h>
34 
35 MODULE_DESCRIPTION("wm8739 driver");
36 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
37 MODULE_LICENSE("GPL");
38 
39 static int debug;
40 
41 module_param(debug, int, 0644);
42 
43 MODULE_PARM_DESC(debug, "Debug level (0-1)");
44 
45 
46 /* ------------------------------------------------------------------------ */
47 
48 enum {
49  R0 = 0, R1,
50  R5 = 5, R6, R7, R8, R9, R15 = 15,
52 };
53 
54 struct wm8739_state {
55  struct v4l2_subdev sd;
57  struct {
58  /* audio cluster */
59  struct v4l2_ctrl *volume;
60  struct v4l2_ctrl *mute;
61  struct v4l2_ctrl *balance;
62  };
64 };
65 
66 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
67 {
68  return container_of(sd, struct wm8739_state, sd);
69 }
70 
71 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
72 {
73  return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
74 }
75 
76 /* ------------------------------------------------------------------------ */
77 
78 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
79 {
80  struct i2c_client *client = v4l2_get_subdevdata(sd);
81  int i;
82 
84  v4l2_err(sd, "Invalid register R%d\n", reg);
85  return -1;
86  }
87 
88  v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
89 
90  for (i = 0; i < 3; i++)
91  if (i2c_smbus_write_byte_data(client,
92  (reg << 1) | (val >> 8), val & 0xff) == 0)
93  return 0;
94  v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
95  return -1;
96 }
97 
98 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
99 {
100  struct v4l2_subdev *sd = to_sd(ctrl);
101  struct wm8739_state *state = to_state(sd);
102  unsigned int work_l, work_r;
103  u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
104  u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
105  u16 mute;
106 
107  switch (ctrl->id) {
109  break;
110 
111  default:
112  return -EINVAL;
113  }
114 
115  /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
116  work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
117  work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;
118 
119  vol_l = (long)work_l * 31 / 65535;
120  vol_r = (long)work_r * 31 / 65535;
121 
122  /* set audio volume etc. */
123  mute = state->mute->val ? 0x80 : 0;
124 
125  /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
126  * Default setting: 0x17 = 0 dB
127  */
128  wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
129  wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
130  return 0;
131 }
132 
133 /* ------------------------------------------------------------------------ */
134 
135 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
136 {
137  struct wm8739_state *state = to_state(sd);
138 
139  state->clock_freq = audiofreq;
140  /* de-activate */
141  wm8739_write(sd, R9, 0x000);
142  switch (audiofreq) {
143  case 44100:
144  /* 256fps, fs=44.1k */
145  wm8739_write(sd, R8, 0x020);
146  break;
147  case 48000:
148  /* 256fps, fs=48k */
149  wm8739_write(sd, R8, 0x000);
150  break;
151  case 32000:
152  /* 256fps, fs=32k */
153  wm8739_write(sd, R8, 0x018);
154  break;
155  default:
156  break;
157  }
158  /* activate */
159  wm8739_write(sd, R9, 0x001);
160  return 0;
161 }
162 
163 static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
164 {
165  struct i2c_client *client = v4l2_get_subdevdata(sd);
166 
167  return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0);
168 }
169 
170 static int wm8739_log_status(struct v4l2_subdev *sd)
171 {
172  struct wm8739_state *state = to_state(sd);
173 
174  v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
175  v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
176  return 0;
177 }
178 
179 /* ----------------------------------------------------------------------- */
180 
181 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
182  .s_ctrl = wm8739_s_ctrl,
183 };
184 
185 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
186  .log_status = wm8739_log_status,
187  .g_chip_ident = wm8739_g_chip_ident,
188  .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
189  .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
190  .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
191  .g_ctrl = v4l2_subdev_g_ctrl,
192  .s_ctrl = v4l2_subdev_s_ctrl,
193  .queryctrl = v4l2_subdev_queryctrl,
194  .querymenu = v4l2_subdev_querymenu,
195 };
196 
197 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
198  .s_clock_freq = wm8739_s_clock_freq,
199 };
200 
201 static const struct v4l2_subdev_ops wm8739_ops = {
202  .core = &wm8739_core_ops,
203  .audio = &wm8739_audio_ops,
204 };
205 
206 /* ------------------------------------------------------------------------ */
207 
208 /* i2c implementation */
209 
210 static int wm8739_probe(struct i2c_client *client,
211  const struct i2c_device_id *id)
212 {
213  struct wm8739_state *state;
214  struct v4l2_subdev *sd;
215 
216  /* Check if the adapter supports the needed features */
217  if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
218  return -EIO;
219 
220  v4l_info(client, "chip found @ 0x%x (%s)\n",
221  client->addr << 1, client->adapter->name);
222 
223  state = kzalloc(sizeof(struct wm8739_state), GFP_KERNEL);
224  if (state == NULL)
225  return -ENOMEM;
226  sd = &state->sd;
227  v4l2_i2c_subdev_init(sd, client, &wm8739_ops);
228  v4l2_ctrl_handler_init(&state->hdl, 2);
229  state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
230  V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
231  state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
232  V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
233  state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
234  V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
235  sd->ctrl_handler = &state->hdl;
236  if (state->hdl.error) {
237  int err = state->hdl.error;
238 
239  v4l2_ctrl_handler_free(&state->hdl);
240  kfree(state);
241  return err;
242  }
243  v4l2_ctrl_cluster(3, &state->volume);
244 
245  state->clock_freq = 48000;
246 
247  /* Initialize wm8739 */
248 
249  /* reset */
250  wm8739_write(sd, R15, 0x00);
251  /* filter setting, high path, offet clear */
252  wm8739_write(sd, R5, 0x000);
253  /* ADC, OSC, Power Off mode Disable */
254  wm8739_write(sd, R6, 0x000);
255  /* Digital Audio interface format:
256  Enable Master mode, 24 bit, MSB first/left justified */
257  wm8739_write(sd, R7, 0x049);
258  /* sampling control: normal, 256fs, 48KHz sampling rate */
259  wm8739_write(sd, R8, 0x000);
260  /* activate */
261  wm8739_write(sd, R9, 0x001);
262  /* set volume/mute */
263  v4l2_ctrl_handler_setup(&state->hdl);
264  return 0;
265 }
266 
267 static int wm8739_remove(struct i2c_client *client)
268 {
269  struct v4l2_subdev *sd = i2c_get_clientdata(client);
270  struct wm8739_state *state = to_state(sd);
271 
273  v4l2_ctrl_handler_free(&state->hdl);
274  kfree(to_state(sd));
275  return 0;
276 }
277 
278 static const struct i2c_device_id wm8739_id[] = {
279  { "wm8739", 0 },
280  { }
281 };
282 MODULE_DEVICE_TABLE(i2c, wm8739_id);
283 
284 static struct i2c_driver wm8739_driver = {
285  .driver = {
286  .owner = THIS_MODULE,
287  .name = "wm8739",
288  },
289  .probe = wm8739_probe,
290  .remove = wm8739_remove,
291  .id_table = wm8739_id,
292 };
293 
294 module_i2c_driver(wm8739_driver);