1 /* 2 * wm8775 - driver version 0.0.1 3 * 4 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to> 5 * 6 * Based on saa7115 driver 7 * 8 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl> 9 * - Cleanup 10 * - V4L2 API update 11 * - sound fixes 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 26 */ 27 28 #include <linux/module.h> 29 #include <linux/types.h> 30 #include <linux/slab.h> 31 #include <linux/ioctl.h> 32 #include <linux/uaccess.h> 33 #include <linux/i2c.h> 34 #include <linux/videodev2.h> 35 #include <media/v4l2-device.h> 36 #include <media/v4l2-ctrls.h> 37 #include <media/i2c/wm8775.h> 38 39 MODULE_DESCRIPTION("wm8775 driver"); 40 MODULE_AUTHOR("Ulf Eklund, Hans Verkuil"); 41 MODULE_LICENSE("GPL"); 42 43 44 45 /* ----------------------------------------------------------------------- */ 46 47 enum { 48 R7 = 7, R11 = 11, 49 R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23, 50 TOT_REGS 51 }; 52 53 #define ALC_HOLD 0x85 /* R17: use zero cross detection, ALC hold time 42.6 ms */ 54 #define ALC_EN 0x100 /* R17: ALC enable */ 55 56 struct wm8775_state { 57 struct v4l2_subdev sd; 58 struct v4l2_ctrl_handler hdl; 59 struct v4l2_ctrl *mute; 60 struct v4l2_ctrl *vol; 61 struct v4l2_ctrl *bal; 62 struct v4l2_ctrl *loud; 63 u8 input; /* Last selected input (0-0xf) */ 64 }; 65 66 static inline struct wm8775_state *to_state(struct v4l2_subdev *sd) 67 { 68 return container_of(sd, struct wm8775_state, sd); 69 } 70 71 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 72 { 73 return &container_of(ctrl->handler, struct wm8775_state, hdl)->sd; 74 } 75 76 static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val) 77 { 78 struct i2c_client *client = v4l2_get_subdevdata(sd); 79 int i; 80 81 if (reg < 0 || reg >= TOT_REGS) { 82 v4l2_err(sd, "Invalid register R%d\n", reg); 83 return -1; 84 } 85 86 for (i = 0; i < 3; i++) 87 if (i2c_smbus_write_byte_data(client, 88 (reg << 1) | (val >> 8), val & 0xff) == 0) 89 return 0; 90 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg); 91 return -1; 92 } 93 94 static void wm8775_set_audio(struct v4l2_subdev *sd, int quietly) 95 { 96 struct wm8775_state *state = to_state(sd); 97 u8 vol_l, vol_r; 98 int muted = 0 != state->mute->val; 99 u16 volume = (u16)state->vol->val; 100 u16 balance = (u16)state->bal->val; 101 102 /* normalize ( 65535 to 0 -> 255 to 0 (+24dB to -103dB) ) */ 103 vol_l = (min(65536 - balance, 32768) * volume) >> 23; 104 vol_r = (min(balance, (u16)32768) * volume) >> 23; 105 106 /* Mute */ 107 if (muted || quietly) 108 wm8775_write(sd, R21, 0x0c0 | state->input); 109 110 wm8775_write(sd, R14, vol_l | 0x100); /* 0x100= Left channel ADC zero cross enable */ 111 wm8775_write(sd, R15, vol_r | 0x100); /* 0x100= Right channel ADC zero cross enable */ 112 113 /* Un-mute */ 114 if (!muted) 115 wm8775_write(sd, R21, state->input); 116 } 117 118 static int wm8775_s_routing(struct v4l2_subdev *sd, 119 u32 input, u32 output, u32 config) 120 { 121 struct wm8775_state *state = to_state(sd); 122 123 /* There are 4 inputs and one output. Zero or more inputs 124 are multiplexed together to the output. Hence there are 125 16 combinations. 126 If only one input is active (the normal case) then the 127 input values 1, 2, 4 or 8 should be used. */ 128 if (input > 15) { 129 v4l2_err(sd, "Invalid input %d.\n", input); 130 return -EINVAL; 131 } 132 state->input = input; 133 if (v4l2_ctrl_g_ctrl(state->mute)) 134 return 0; 135 if (!v4l2_ctrl_g_ctrl(state->vol)) 136 return 0; 137 wm8775_set_audio(sd, 1); 138 return 0; 139 } 140 141 static int wm8775_s_ctrl(struct v4l2_ctrl *ctrl) 142 { 143 struct v4l2_subdev *sd = to_sd(ctrl); 144 145 switch (ctrl->id) { 146 case V4L2_CID_AUDIO_MUTE: 147 case V4L2_CID_AUDIO_VOLUME: 148 case V4L2_CID_AUDIO_BALANCE: 149 wm8775_set_audio(sd, 0); 150 return 0; 151 case V4L2_CID_AUDIO_LOUDNESS: 152 wm8775_write(sd, R17, (ctrl->val ? ALC_EN : 0) | ALC_HOLD); 153 return 0; 154 } 155 return -EINVAL; 156 } 157 158 static int wm8775_log_status(struct v4l2_subdev *sd) 159 { 160 struct wm8775_state *state = to_state(sd); 161 162 v4l2_info(sd, "Input: %d\n", state->input); 163 v4l2_ctrl_handler_log_status(&state->hdl, sd->name); 164 return 0; 165 } 166 167 static int wm8775_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *freq) 168 { 169 wm8775_set_audio(sd, 0); 170 return 0; 171 } 172 173 /* ----------------------------------------------------------------------- */ 174 175 static const struct v4l2_ctrl_ops wm8775_ctrl_ops = { 176 .s_ctrl = wm8775_s_ctrl, 177 }; 178 179 static const struct v4l2_subdev_core_ops wm8775_core_ops = { 180 .log_status = wm8775_log_status, 181 }; 182 183 static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = { 184 .s_frequency = wm8775_s_frequency, 185 }; 186 187 static const struct v4l2_subdev_audio_ops wm8775_audio_ops = { 188 .s_routing = wm8775_s_routing, 189 }; 190 191 static const struct v4l2_subdev_ops wm8775_ops = { 192 .core = &wm8775_core_ops, 193 .tuner = &wm8775_tuner_ops, 194 .audio = &wm8775_audio_ops, 195 }; 196 197 /* ----------------------------------------------------------------------- */ 198 199 /* i2c implementation */ 200 201 /* 202 * Generic i2c probe 203 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 204 */ 205 206 static int wm8775_probe(struct i2c_client *client, 207 const struct i2c_device_id *id) 208 { 209 struct wm8775_state *state; 210 struct v4l2_subdev *sd; 211 int err; 212 bool is_nova_s = false; 213 214 if (client->dev.platform_data) { 215 struct wm8775_platform_data *data = client->dev.platform_data; 216 is_nova_s = data->is_nova_s; 217 } 218 219 /* Check if the adapter supports the needed features */ 220 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 221 return -EIO; 222 223 v4l_info(client, "chip found @ 0x%02x (%s)\n", 224 client->addr << 1, client->adapter->name); 225 226 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); 227 if (state == NULL) 228 return -ENOMEM; 229 sd = &state->sd; 230 v4l2_i2c_subdev_init(sd, client, &wm8775_ops); 231 state->input = 2; 232 233 v4l2_ctrl_handler_init(&state->hdl, 4); 234 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, 235 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 236 state->vol = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, 237 V4L2_CID_AUDIO_VOLUME, 0, 65535, (65535+99)/100, 0xCF00); /* 0dB*/ 238 state->bal = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, 239 V4L2_CID_AUDIO_BALANCE, 0, 65535, (65535+99)/100, 32768); 240 state->loud = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, 241 V4L2_CID_AUDIO_LOUDNESS, 0, 1, 1, 1); 242 sd->ctrl_handler = &state->hdl; 243 err = state->hdl.error; 244 if (err) { 245 v4l2_ctrl_handler_free(&state->hdl); 246 return err; 247 } 248 249 /* Initialize wm8775 */ 250 251 /* RESET */ 252 wm8775_write(sd, R23, 0x000); 253 /* Disable zero cross detect timeout */ 254 wm8775_write(sd, R7, 0x000); 255 /* HPF enable, left justified, 24-bit (Philips) mode */ 256 wm8775_write(sd, R11, 0x021); 257 /* Master mode, clock ratio 256fs */ 258 wm8775_write(sd, R12, 0x102); 259 /* Powered up */ 260 wm8775_write(sd, R13, 0x000); 261 262 if (!is_nova_s) { 263 /* ADC gain +2.5dB, enable zero cross */ 264 wm8775_write(sd, R14, 0x1d4); 265 /* ADC gain +2.5dB, enable zero cross */ 266 wm8775_write(sd, R15, 0x1d4); 267 /* ALC Stereo, ALC target level -1dB FS max gain +8dB */ 268 wm8775_write(sd, R16, 0x1bf); 269 /* Enable gain control, use zero cross detection, 270 ALC hold time 42.6 ms */ 271 wm8775_write(sd, R17, 0x185); 272 } else { 273 /* ALC stereo, ALC target level -5dB FS, ALC max gain +8dB */ 274 wm8775_write(sd, R16, 0x1bb); 275 /* Set ALC mode and hold time */ 276 wm8775_write(sd, R17, (state->loud->val ? ALC_EN : 0) | ALC_HOLD); 277 } 278 /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */ 279 wm8775_write(sd, R18, 0x0a2); 280 /* Enable noise gate, threshold -72dBfs */ 281 wm8775_write(sd, R19, 0x005); 282 if (!is_nova_s) { 283 /* Transient window 4ms, lower PGA gain limit -1dB */ 284 wm8775_write(sd, R20, 0x07a); 285 /* LRBOTH = 1, use input 2. */ 286 wm8775_write(sd, R21, 0x102); 287 } else { 288 /* Transient window 4ms, ALC min gain -5dB */ 289 wm8775_write(sd, R20, 0x0fb); 290 291 wm8775_set_audio(sd, 1); /* set volume/mute/mux */ 292 } 293 return 0; 294 } 295 296 static int wm8775_remove(struct i2c_client *client) 297 { 298 struct v4l2_subdev *sd = i2c_get_clientdata(client); 299 struct wm8775_state *state = to_state(sd); 300 301 v4l2_device_unregister_subdev(sd); 302 v4l2_ctrl_handler_free(&state->hdl); 303 return 0; 304 } 305 306 static const struct i2c_device_id wm8775_id[] = { 307 { "wm8775", 0 }, 308 { } 309 }; 310 MODULE_DEVICE_TABLE(i2c, wm8775_id); 311 312 static struct i2c_driver wm8775_driver = { 313 .driver = { 314 .name = "wm8775", 315 }, 316 .probe = wm8775_probe, 317 .remove = wm8775_remove, 318 .id_table = wm8775_id, 319 }; 320 321 module_i2c_driver(wm8775_driver); 322