1/* 2 * wm8739 3 * 4 * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com> 5 * 6 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl> 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/ioctl.h> 27#include <asm/uaccess.h> 28#include <linux/i2c.h> 29#include <linux/i2c-id.h> 30#include <linux/videodev.h> 31#include <media/v4l2-common.h> 32#include <media/v4l2-chip-ident.h> 33 34MODULE_DESCRIPTION("wm8739 driver"); 35MODULE_AUTHOR("T. Adachi, Hans Verkuil"); 36MODULE_LICENSE("GPL"); 37 38static int debug = 0; 39static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END }; 40 41module_param(debug, int, 0644); 42 43MODULE_PARM_DESC(debug, "Debug level (0-1)"); 44 45 46I2C_CLIENT_INSMOD; 47 48/* ------------------------------------------------------------------------ */ 49 50enum { 51 R0 = 0, R1, 52 R5 = 5, R6, R7, R8, R9, R15 = 15, 53 TOT_REGS 54}; 55 56struct wm8739_state { 57 u32 clock_freq; 58 u8 muted; 59 u16 volume; 60 u16 balance; 61 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 62 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 63}; 64 65/* ------------------------------------------------------------------------ */ 66 67static int wm8739_write(struct i2c_client *client, int reg, u16 val) 68{ 69 int i; 70 71 if (reg < 0 || reg >= TOT_REGS) { 72 v4l_err(client, "Invalid register R%d\n", reg); 73 return -1; 74 } 75 76 v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val); 77 78 for (i = 0; i < 3; i++) { 79 if (i2c_smbus_write_byte_data(client, (reg << 1) | 80 (val >> 8), val & 0xff) == 0) { 81 return 0; 82 } 83 } 84 v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg); 85 return -1; 86} 87 88/* write regs to set audio volume etc */ 89static void wm8739_set_audio(struct i2c_client *client) 90{ 91 struct wm8739_state *state = i2c_get_clientdata(client); 92 u16 mute = state->muted ? 0x80 : 0; 93 94 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB 95 * Default setting: 0x17 = 0 dB 96 */ 97 wm8739_write(client, R0, (state->vol_l & 0x1f) | mute); 98 wm8739_write(client, R1, (state->vol_r & 0x1f) | mute); 99} 100 101static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl) 102{ 103 struct wm8739_state *state = i2c_get_clientdata(client); 104 105 switch (ctrl->id) { 106 case V4L2_CID_AUDIO_MUTE: 107 ctrl->value = state->muted; 108 break; 109 110 case V4L2_CID_AUDIO_VOLUME: 111 ctrl->value = state->volume; 112 break; 113 114 case V4L2_CID_AUDIO_BALANCE: 115 ctrl->value = state->balance; 116 break; 117 118 default: 119 return -EINVAL; 120 } 121 return 0; 122} 123 124static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl) 125{ 126 struct wm8739_state *state = i2c_get_clientdata(client); 127 unsigned int work_l, work_r; 128 129 switch (ctrl->id) { 130 case V4L2_CID_AUDIO_MUTE: 131 state->muted = ctrl->value; 132 break; 133 134 case V4L2_CID_AUDIO_VOLUME: 135 state->volume = ctrl->value; 136 break; 137 138 case V4L2_CID_AUDIO_BALANCE: 139 state->balance = ctrl->value; 140 break; 141 142 default: 143 return -EINVAL; 144 } 145 146 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */ 147 work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768; 148 work_r = (min(state->balance, (u16)32768) * state->volume) / 32768; 149 150 state->vol_l = (long)work_l * 31 / 65535; 151 state->vol_r = (long)work_r * 31 / 65535; 152 153 /* set audio volume etc. */ 154 wm8739_set_audio(client); 155 return 0; 156} 157 158/* ------------------------------------------------------------------------ */ 159 160static struct v4l2_queryctrl wm8739_qctrl[] = { 161 { 162 .id = V4L2_CID_AUDIO_VOLUME, 163 .name = "Volume", 164 .minimum = 0, 165 .maximum = 65535, 166 .step = 65535/100, 167 .default_value = 58880, 168 .flags = 0, 169 .type = V4L2_CTRL_TYPE_INTEGER, 170 },{ 171 .id = V4L2_CID_AUDIO_MUTE, 172 .name = "Mute", 173 .minimum = 0, 174 .maximum = 1, 175 .step = 1, 176 .default_value = 1, 177 .flags = 0, 178 .type = V4L2_CTRL_TYPE_BOOLEAN, 179 },{ 180 .id = V4L2_CID_AUDIO_BALANCE, 181 .name = "Balance", 182 .minimum = 0, 183 .maximum = 65535, 184 .step = 65535/100, 185 .default_value = 32768, 186 .flags = 0, 187 .type = V4L2_CTRL_TYPE_INTEGER, 188 } 189}; 190 191/* ------------------------------------------------------------------------ */ 192 193static int wm8739_command(struct i2c_client *client, unsigned int cmd, void *arg) 194{ 195 struct wm8739_state *state = i2c_get_clientdata(client); 196 197 switch (cmd) { 198 case VIDIOC_INT_AUDIO_CLOCK_FREQ: 199 { 200 u32 audiofreq = *(u32 *)arg; 201 202 state->clock_freq = audiofreq; 203 wm8739_write(client, R9, 0x000); /* de-activate */ 204 switch (audiofreq) { 205 case 44100: 206 wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k */ 207 break; 208 case 48000: 209 wm8739_write(client, R8, 0x000); /* 256fps, fs=48k */ 210 break; 211 case 32000: 212 wm8739_write(client, R8, 0x018); /* 256fps, fs=32k */ 213 break; 214 default: 215 break; 216 } 217 wm8739_write(client, R9, 0x001); /* activate */ 218 break; 219 } 220 221 case VIDIOC_G_CTRL: 222 return wm8739_get_ctrl(client, arg); 223 224 case VIDIOC_S_CTRL: 225 return wm8739_set_ctrl(client, arg); 226 227 case VIDIOC_QUERYCTRL: 228 { 229 struct v4l2_queryctrl *qc = arg; 230 int i; 231 232 for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++) 233 if (qc->id && qc->id == wm8739_qctrl[i].id) { 234 memcpy(qc, &wm8739_qctrl[i], sizeof(*qc)); 235 return 0; 236 } 237 return -EINVAL; 238 } 239 240 case VIDIOC_G_CHIP_IDENT: 241 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_WM8739, 0); 242 243 case VIDIOC_LOG_STATUS: 244 v4l_info(client, "Frequency: %u Hz\n", state->clock_freq); 245 v4l_info(client, "Volume L: %02x%s\n", state->vol_l & 0x1f, 246 state->muted ? " (muted)" : ""); 247 v4l_info(client, "Volume R: %02x%s\n", state->vol_r & 0x1f, 248 state->muted ? " (muted)" : ""); 249 break; 250 251 default: 252 return -EINVAL; 253 } 254 255 return 0; 256} 257 258/* ------------------------------------------------------------------------ */ 259 260/* i2c implementation */ 261 262static struct i2c_driver i2c_driver; 263 264static int wm8739_attach(struct i2c_adapter *adapter, int address, int kind) 265{ 266 struct i2c_client *client; 267 struct wm8739_state *state; 268 269 /* Check if the adapter supports the needed features */ 270 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 271 return 0; 272 273 client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); 274 if (client == NULL) 275 return -ENOMEM; 276 277 client->addr = address; 278 client->adapter = adapter; 279 client->driver = &i2c_driver; 280 snprintf(client->name, sizeof(client->name) - 1, "wm8739"); 281 282 v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name); 283 284 state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL); 285 if (state == NULL) { 286 kfree(client); 287 return -ENOMEM; 288 } 289 state->vol_l = 0x17; /* 0dB */ 290 state->vol_r = 0x17; /* 0dB */ 291 state->muted = 0; 292 state->balance = 32768; 293 /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */ 294 state->volume = ((long)state->vol_l + 1) * 65535 / 31; 295 state->clock_freq = 48000; 296 i2c_set_clientdata(client, state); 297 298 /* initialize wm8739 */ 299 wm8739_write(client, R15, 0x00); /* reset */ 300 wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */ 301 wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */ 302 wm8739_write(client, R7, 0x049); /* Digital Audio interface format */ 303 /* Enable Master mode */ 304 /* 24 bit, MSB first/left justified */ 305 wm8739_write(client, R8, 0x000); /* sampling control */ 306 /* normal, 256fs, 48KHz sampling rate */ 307 wm8739_write(client, R9, 0x001); /* activate */ 308 wm8739_set_audio(client); /* set volume/mute */ 309 310 i2c_attach_client(client); 311 312 return 0; 313} 314 315static int wm8739_probe(struct i2c_adapter *adapter) 316{ 317 if (adapter->class & I2C_CLASS_TV_ANALOG) 318 return i2c_probe(adapter, &addr_data, wm8739_attach); 319 return 0; 320} 321 322static int wm8739_detach(struct i2c_client *client) 323{ 324 int err; 325 326 err = i2c_detach_client(client); 327 if (err) 328 return err; 329 330 kfree(client); 331 return 0; 332} 333 334/* ----------------------------------------------------------------------- */ 335 336/* i2c implementation */ 337static struct i2c_driver i2c_driver = { 338 .driver = { 339 .name = "wm8739", 340 }, 341 .id = I2C_DRIVERID_WM8739, 342 .attach_adapter = wm8739_probe, 343 .detach_client = wm8739_detach, 344 .command = wm8739_command, 345}; 346 347 348static int __init wm8739_init_module(void) 349{ 350 return i2c_add_driver(&i2c_driver); 351} 352 353static void __exit wm8739_cleanup_module(void) 354{ 355 i2c_del_driver(&i2c_driver); 356} 357 358module_init(wm8739_init_module); 359module_exit(wm8739_cleanup_module); 360