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/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, 51 TOT_REGS 52 }; 53 54 struct wm8739_state { 55 struct v4l2_subdev sd; 56 struct v4l2_ctrl_handler hdl; 57 struct { 58 /* audio cluster */ 59 struct v4l2_ctrl *volume; 60 struct v4l2_ctrl *mute; 61 struct v4l2_ctrl *balance; 62 }; 63 u32 clock_freq; 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 83 if (reg < 0 || reg >= TOT_REGS) { 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) { 108 case V4L2_CID_AUDIO_VOLUME: 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); 271 272 v4l2_device_unregister_subdev(sd); 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); 295