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-ctrls.h> 33 34MODULE_DESCRIPTION("wm8739 driver"); 35MODULE_AUTHOR("T. Adachi, Hans Verkuil"); 36MODULE_LICENSE("GPL"); 37 38static int debug; 39 40module_param(debug, int, 0644); 41 42MODULE_PARM_DESC(debug, "Debug level (0-1)"); 43 44 45/* ------------------------------------------------------------------------ */ 46 47enum { 48 R0 = 0, R1, 49 R5 = 5, R6, R7, R8, R9, R15 = 15, 50 TOT_REGS 51}; 52 53struct wm8739_state { 54 struct v4l2_subdev sd; 55 struct v4l2_ctrl_handler hdl; 56 struct { 57 /* audio cluster */ 58 struct v4l2_ctrl *volume; 59 struct v4l2_ctrl *mute; 60 struct v4l2_ctrl *balance; 61 }; 62 u32 clock_freq; 63}; 64 65static inline struct wm8739_state *to_state(struct v4l2_subdev *sd) 66{ 67 return container_of(sd, struct wm8739_state, sd); 68} 69 70static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 71{ 72 return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd; 73} 74 75/* ------------------------------------------------------------------------ */ 76 77static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val) 78{ 79 struct i2c_client *client = v4l2_get_subdevdata(sd); 80 int i; 81 82 if (reg < 0 || reg >= TOT_REGS) { 83 v4l2_err(sd, "Invalid register R%d\n", reg); 84 return -1; 85 } 86 87 v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val); 88 89 for (i = 0; i < 3; i++) 90 if (i2c_smbus_write_byte_data(client, 91 (reg << 1) | (val >> 8), val & 0xff) == 0) 92 return 0; 93 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg); 94 return -1; 95} 96 97static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl) 98{ 99 struct v4l2_subdev *sd = to_sd(ctrl); 100 struct wm8739_state *state = to_state(sd); 101 unsigned int work_l, work_r; 102 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 103 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 104 u16 mute; 105 106 switch (ctrl->id) { 107 case V4L2_CID_AUDIO_VOLUME: 108 break; 109 110 default: 111 return -EINVAL; 112 } 113 114 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */ 115 work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768; 116 work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768; 117 118 vol_l = (long)work_l * 31 / 65535; 119 vol_r = (long)work_r * 31 / 65535; 120 121 /* set audio volume etc. */ 122 mute = state->mute->val ? 0x80 : 0; 123 124 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB 125 * Default setting: 0x17 = 0 dB 126 */ 127 wm8739_write(sd, R0, (vol_l & 0x1f) | mute); 128 wm8739_write(sd, R1, (vol_r & 0x1f) | mute); 129 return 0; 130} 131 132/* ------------------------------------------------------------------------ */ 133 134static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq) 135{ 136 struct wm8739_state *state = to_state(sd); 137 138 state->clock_freq = audiofreq; 139 /* de-activate */ 140 wm8739_write(sd, R9, 0x000); 141 switch (audiofreq) { 142 case 44100: 143 /* 256fps, fs=44.1k */ 144 wm8739_write(sd, R8, 0x020); 145 break; 146 case 48000: 147 /* 256fps, fs=48k */ 148 wm8739_write(sd, R8, 0x000); 149 break; 150 case 32000: 151 /* 256fps, fs=32k */ 152 wm8739_write(sd, R8, 0x018); 153 break; 154 default: 155 break; 156 } 157 /* activate */ 158 wm8739_write(sd, R9, 0x001); 159 return 0; 160} 161 162static int wm8739_log_status(struct v4l2_subdev *sd) 163{ 164 struct wm8739_state *state = to_state(sd); 165 166 v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq); 167 v4l2_ctrl_handler_log_status(&state->hdl, sd->name); 168 return 0; 169} 170 171/* ----------------------------------------------------------------------- */ 172 173static const struct v4l2_ctrl_ops wm8739_ctrl_ops = { 174 .s_ctrl = wm8739_s_ctrl, 175}; 176 177static const struct v4l2_subdev_core_ops wm8739_core_ops = { 178 .log_status = wm8739_log_status, 179 .g_ext_ctrls = v4l2_subdev_g_ext_ctrls, 180 .try_ext_ctrls = v4l2_subdev_try_ext_ctrls, 181 .s_ext_ctrls = v4l2_subdev_s_ext_ctrls, 182 .g_ctrl = v4l2_subdev_g_ctrl, 183 .s_ctrl = v4l2_subdev_s_ctrl, 184 .queryctrl = v4l2_subdev_queryctrl, 185 .querymenu = v4l2_subdev_querymenu, 186}; 187 188static const struct v4l2_subdev_audio_ops wm8739_audio_ops = { 189 .s_clock_freq = wm8739_s_clock_freq, 190}; 191 192static const struct v4l2_subdev_ops wm8739_ops = { 193 .core = &wm8739_core_ops, 194 .audio = &wm8739_audio_ops, 195}; 196 197/* ------------------------------------------------------------------------ */ 198 199/* i2c implementation */ 200 201static int wm8739_probe(struct i2c_client *client, 202 const struct i2c_device_id *id) 203{ 204 struct wm8739_state *state; 205 struct v4l2_subdev *sd; 206 207 /* Check if the adapter supports the needed features */ 208 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 209 return -EIO; 210 211 v4l_info(client, "chip found @ 0x%x (%s)\n", 212 client->addr << 1, client->adapter->name); 213 214 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); 215 if (state == NULL) 216 return -ENOMEM; 217 sd = &state->sd; 218 v4l2_i2c_subdev_init(sd, client, &wm8739_ops); 219 v4l2_ctrl_handler_init(&state->hdl, 2); 220 state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 221 V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736); 222 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 223 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 224 state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 225 V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768); 226 sd->ctrl_handler = &state->hdl; 227 if (state->hdl.error) { 228 int err = state->hdl.error; 229 230 v4l2_ctrl_handler_free(&state->hdl); 231 return err; 232 } 233 v4l2_ctrl_cluster(3, &state->volume); 234 235 state->clock_freq = 48000; 236 237 /* Initialize wm8739 */ 238 239 /* reset */ 240 wm8739_write(sd, R15, 0x00); 241 /* filter setting, high path, offet clear */ 242 wm8739_write(sd, R5, 0x000); 243 /* ADC, OSC, Power Off mode Disable */ 244 wm8739_write(sd, R6, 0x000); 245 /* Digital Audio interface format: 246 Enable Master mode, 24 bit, MSB first/left justified */ 247 wm8739_write(sd, R7, 0x049); 248 /* sampling control: normal, 256fs, 48KHz sampling rate */ 249 wm8739_write(sd, R8, 0x000); 250 /* activate */ 251 wm8739_write(sd, R9, 0x001); 252 /* set volume/mute */ 253 v4l2_ctrl_handler_setup(&state->hdl); 254 return 0; 255} 256 257static int wm8739_remove(struct i2c_client *client) 258{ 259 struct v4l2_subdev *sd = i2c_get_clientdata(client); 260 struct wm8739_state *state = to_state(sd); 261 262 v4l2_device_unregister_subdev(sd); 263 v4l2_ctrl_handler_free(&state->hdl); 264 return 0; 265} 266 267static const struct i2c_device_id wm8739_id[] = { 268 { "wm8739", 0 }, 269 { } 270}; 271MODULE_DEVICE_TABLE(i2c, wm8739_id); 272 273static struct i2c_driver wm8739_driver = { 274 .driver = { 275 .owner = THIS_MODULE, 276 .name = "wm8739", 277 }, 278 .probe = wm8739_probe, 279 .remove = wm8739_remove, 280 .id_table = wm8739_id, 281}; 282 283module_i2c_driver(wm8739_driver); 284