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 20 #include <linux/module.h> 21 #include <linux/types.h> 22 #include <linux/slab.h> 23 #include <linux/ioctl.h> 24 #include <linux/uaccess.h> 25 #include <linux/i2c.h> 26 #include <linux/videodev2.h> 27 #include <media/v4l2-device.h> 28 #include <media/v4l2-ctrls.h> 29 30 MODULE_DESCRIPTION("wm8739 driver"); 31 MODULE_AUTHOR("T. Adachi, Hans Verkuil"); 32 MODULE_LICENSE("GPL"); 33 34 static int debug; 35 36 module_param(debug, int, 0644); 37 38 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 39 40 41 /* ------------------------------------------------------------------------ */ 42 43 enum { 44 R0 = 0, R1, 45 R5 = 5, R6, R7, R8, R9, R15 = 15, 46 TOT_REGS 47 }; 48 49 struct wm8739_state { 50 struct v4l2_subdev sd; 51 struct v4l2_ctrl_handler hdl; 52 struct { 53 /* audio cluster */ 54 struct v4l2_ctrl *volume; 55 struct v4l2_ctrl *mute; 56 struct v4l2_ctrl *balance; 57 }; 58 u32 clock_freq; 59 }; 60 61 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd) 62 { 63 return container_of(sd, struct wm8739_state, sd); 64 } 65 66 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 67 { 68 return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd; 69 } 70 71 /* ------------------------------------------------------------------------ */ 72 73 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val) 74 { 75 struct i2c_client *client = v4l2_get_subdevdata(sd); 76 int i; 77 78 if (reg < 0 || reg >= TOT_REGS) { 79 v4l2_err(sd, "Invalid register R%d\n", reg); 80 return -1; 81 } 82 83 v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val); 84 85 for (i = 0; i < 3; i++) 86 if (i2c_smbus_write_byte_data(client, 87 (reg << 1) | (val >> 8), val & 0xff) == 0) 88 return 0; 89 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg); 90 return -1; 91 } 92 93 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl) 94 { 95 struct v4l2_subdev *sd = to_sd(ctrl); 96 struct wm8739_state *state = to_state(sd); 97 unsigned int work_l, work_r; 98 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 99 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 100 u16 mute; 101 102 switch (ctrl->id) { 103 case V4L2_CID_AUDIO_VOLUME: 104 break; 105 106 default: 107 return -EINVAL; 108 } 109 110 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */ 111 work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768; 112 work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768; 113 114 vol_l = (long)work_l * 31 / 65535; 115 vol_r = (long)work_r * 31 / 65535; 116 117 /* set audio volume etc. */ 118 mute = state->mute->val ? 0x80 : 0; 119 120 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB 121 * Default setting: 0x17 = 0 dB 122 */ 123 wm8739_write(sd, R0, (vol_l & 0x1f) | mute); 124 wm8739_write(sd, R1, (vol_r & 0x1f) | mute); 125 return 0; 126 } 127 128 /* ------------------------------------------------------------------------ */ 129 130 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq) 131 { 132 struct wm8739_state *state = to_state(sd); 133 134 state->clock_freq = audiofreq; 135 /* de-activate */ 136 wm8739_write(sd, R9, 0x000); 137 switch (audiofreq) { 138 case 44100: 139 /* 256fps, fs=44.1k */ 140 wm8739_write(sd, R8, 0x020); 141 break; 142 case 48000: 143 /* 256fps, fs=48k */ 144 wm8739_write(sd, R8, 0x000); 145 break; 146 case 32000: 147 /* 256fps, fs=32k */ 148 wm8739_write(sd, R8, 0x018); 149 break; 150 default: 151 break; 152 } 153 /* activate */ 154 wm8739_write(sd, R9, 0x001); 155 return 0; 156 } 157 158 static int wm8739_log_status(struct v4l2_subdev *sd) 159 { 160 struct wm8739_state *state = to_state(sd); 161 162 v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq); 163 v4l2_ctrl_handler_log_status(&state->hdl, sd->name); 164 return 0; 165 } 166 167 /* ----------------------------------------------------------------------- */ 168 169 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = { 170 .s_ctrl = wm8739_s_ctrl, 171 }; 172 173 static const struct v4l2_subdev_core_ops wm8739_core_ops = { 174 .log_status = wm8739_log_status, 175 }; 176 177 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = { 178 .s_clock_freq = wm8739_s_clock_freq, 179 }; 180 181 static const struct v4l2_subdev_ops wm8739_ops = { 182 .core = &wm8739_core_ops, 183 .audio = &wm8739_audio_ops, 184 }; 185 186 /* ------------------------------------------------------------------------ */ 187 188 /* i2c implementation */ 189 190 static int wm8739_probe(struct i2c_client *client, 191 const struct i2c_device_id *id) 192 { 193 struct wm8739_state *state; 194 struct v4l2_subdev *sd; 195 196 /* Check if the adapter supports the needed features */ 197 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 198 return -EIO; 199 200 v4l_info(client, "chip found @ 0x%x (%s)\n", 201 client->addr << 1, client->adapter->name); 202 203 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); 204 if (state == NULL) 205 return -ENOMEM; 206 sd = &state->sd; 207 v4l2_i2c_subdev_init(sd, client, &wm8739_ops); 208 v4l2_ctrl_handler_init(&state->hdl, 2); 209 state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 210 V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736); 211 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 212 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 213 state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 214 V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768); 215 sd->ctrl_handler = &state->hdl; 216 if (state->hdl.error) { 217 int err = state->hdl.error; 218 219 v4l2_ctrl_handler_free(&state->hdl); 220 return err; 221 } 222 v4l2_ctrl_cluster(3, &state->volume); 223 224 state->clock_freq = 48000; 225 226 /* Initialize wm8739 */ 227 228 /* reset */ 229 wm8739_write(sd, R15, 0x00); 230 /* filter setting, high path, offet clear */ 231 wm8739_write(sd, R5, 0x000); 232 /* ADC, OSC, Power Off mode Disable */ 233 wm8739_write(sd, R6, 0x000); 234 /* Digital Audio interface format: 235 Enable Master mode, 24 bit, MSB first/left justified */ 236 wm8739_write(sd, R7, 0x049); 237 /* sampling control: normal, 256fs, 48KHz sampling rate */ 238 wm8739_write(sd, R8, 0x000); 239 /* activate */ 240 wm8739_write(sd, R9, 0x001); 241 /* set volume/mute */ 242 v4l2_ctrl_handler_setup(&state->hdl); 243 return 0; 244 } 245 246 static int wm8739_remove(struct i2c_client *client) 247 { 248 struct v4l2_subdev *sd = i2c_get_clientdata(client); 249 struct wm8739_state *state = to_state(sd); 250 251 v4l2_device_unregister_subdev(sd); 252 v4l2_ctrl_handler_free(&state->hdl); 253 return 0; 254 } 255 256 static const struct i2c_device_id wm8739_id[] = { 257 { "wm8739", 0 }, 258 { } 259 }; 260 MODULE_DEVICE_TABLE(i2c, wm8739_id); 261 262 static struct i2c_driver wm8739_driver = { 263 .driver = { 264 .name = "wm8739", 265 }, 266 .probe = wm8739_probe, 267 .remove = wm8739_remove, 268 .id_table = wm8739_id, 269 }; 270 271 module_i2c_driver(wm8739_driver); 272