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-i2c-drv.h> 34#include <media/v4l2-ctrls.h> 35 36MODULE_DESCRIPTION("wm8739 driver"); 37MODULE_AUTHOR("T. Adachi, Hans Verkuil"); 38MODULE_LICENSE("GPL"); 39 40static int debug; 41 42module_param(debug, int, 0644); 43 44MODULE_PARM_DESC(debug, "Debug level (0-1)"); 45 46 47/* ------------------------------------------------------------------------ */ 48 49enum { 50 R0 = 0, R1, 51 R5 = 5, R6, R7, R8, R9, R15 = 15, 52 TOT_REGS 53}; 54 55struct wm8739_state { 56 struct v4l2_subdev sd; 57 struct v4l2_ctrl_handler hdl; 58 struct { 59 /* audio cluster */ 60 struct v4l2_ctrl *volume; 61 struct v4l2_ctrl *mute; 62 struct v4l2_ctrl *balance; 63 }; 64 u32 clock_freq; 65}; 66 67static inline struct wm8739_state *to_state(struct v4l2_subdev *sd) 68{ 69 return container_of(sd, struct wm8739_state, sd); 70} 71 72static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 73{ 74 return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd; 75} 76 77/* ------------------------------------------------------------------------ */ 78 79static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val) 80{ 81 struct i2c_client *client = v4l2_get_subdevdata(sd); 82 int i; 83 84 if (reg < 0 || reg >= TOT_REGS) { 85 v4l2_err(sd, "Invalid register R%d\n", reg); 86 return -1; 87 } 88 89 v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val); 90 91 for (i = 0; i < 3; i++) 92 if (i2c_smbus_write_byte_data(client, 93 (reg << 1) | (val >> 8), val & 0xff) == 0) 94 return 0; 95 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg); 96 return -1; 97} 98 99static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl) 100{ 101 struct v4l2_subdev *sd = to_sd(ctrl); 102 struct wm8739_state *state = to_state(sd); 103 unsigned int work_l, work_r; 104 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 105 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 106 u16 mute; 107 108 switch (ctrl->id) { 109 case V4L2_CID_AUDIO_VOLUME: 110 break; 111 112 default: 113 return -EINVAL; 114 } 115 116 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */ 117 work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768; 118 work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768; 119 120 vol_l = (long)work_l * 31 / 65535; 121 vol_r = (long)work_r * 31 / 65535; 122 123 /* set audio volume etc. */ 124 mute = state->mute->val ? 0x80 : 0; 125 126 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB 127 * Default setting: 0x17 = 0 dB 128 */ 129 wm8739_write(sd, R0, (vol_l & 0x1f) | mute); 130 wm8739_write(sd, R1, (vol_r & 0x1f) | mute); 131 return 0; 132} 133 134/* ------------------------------------------------------------------------ */ 135 136static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq) 137{ 138 struct wm8739_state *state = to_state(sd); 139 140 state->clock_freq = audiofreq; 141 /* de-activate */ 142 wm8739_write(sd, R9, 0x000); 143 switch (audiofreq) { 144 case 44100: 145 /* 256fps, fs=44.1k */ 146 wm8739_write(sd, R8, 0x020); 147 break; 148 case 48000: 149 /* 256fps, fs=48k */ 150 wm8739_write(sd, R8, 0x000); 151 break; 152 case 32000: 153 /* 256fps, fs=32k */ 154 wm8739_write(sd, R8, 0x018); 155 break; 156 default: 157 break; 158 } 159 /* activate */ 160 wm8739_write(sd, R9, 0x001); 161 return 0; 162} 163 164static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 165{ 166 struct i2c_client *client = v4l2_get_subdevdata(sd); 167 168 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 0); 169} 170 171static int wm8739_log_status(struct v4l2_subdev *sd) 172{ 173 struct wm8739_state *state = to_state(sd); 174 175 v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq); 176 v4l2_ctrl_handler_log_status(&state->hdl, sd->name); 177 return 0; 178} 179 180/* ----------------------------------------------------------------------- */ 181 182static const struct v4l2_ctrl_ops wm8739_ctrl_ops = { 183 .s_ctrl = wm8739_s_ctrl, 184}; 185 186static const struct v4l2_subdev_core_ops wm8739_core_ops = { 187 .log_status = wm8739_log_status, 188 .g_chip_ident = wm8739_g_chip_ident, 189 .g_ext_ctrls = v4l2_subdev_g_ext_ctrls, 190 .try_ext_ctrls = v4l2_subdev_try_ext_ctrls, 191 .s_ext_ctrls = v4l2_subdev_s_ext_ctrls, 192 .g_ctrl = v4l2_subdev_g_ctrl, 193 .s_ctrl = v4l2_subdev_s_ctrl, 194 .queryctrl = v4l2_subdev_queryctrl, 195 .querymenu = v4l2_subdev_querymenu, 196}; 197 198static const struct v4l2_subdev_audio_ops wm8739_audio_ops = { 199 .s_clock_freq = wm8739_s_clock_freq, 200}; 201 202static const struct v4l2_subdev_ops wm8739_ops = { 203 .core = &wm8739_core_ops, 204 .audio = &wm8739_audio_ops, 205}; 206 207/* ------------------------------------------------------------------------ */ 208 209/* i2c implementation */ 210 211static int wm8739_probe(struct i2c_client *client, 212 const struct i2c_device_id *id) 213{ 214 struct wm8739_state *state; 215 struct v4l2_subdev *sd; 216 217 /* Check if the adapter supports the needed features */ 218 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 219 return -EIO; 220 221 v4l_info(client, "chip found @ 0x%x (%s)\n", 222 client->addr << 1, client->adapter->name); 223 224 state = kzalloc(sizeof(struct wm8739_state), GFP_KERNEL); 225 if (state == NULL) 226 return -ENOMEM; 227 sd = &state->sd; 228 v4l2_i2c_subdev_init(sd, client, &wm8739_ops); 229 v4l2_ctrl_handler_init(&state->hdl, 2); 230 state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 231 V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736); 232 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 233 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 234 state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 235 V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768); 236 sd->ctrl_handler = &state->hdl; 237 if (state->hdl.error) { 238 int err = state->hdl.error; 239 240 v4l2_ctrl_handler_free(&state->hdl); 241 kfree(state); 242 return err; 243 } 244 v4l2_ctrl_cluster(3, &state->volume); 245 246 state->clock_freq = 48000; 247 248 /* Initialize wm8739 */ 249 250 /* reset */ 251 wm8739_write(sd, R15, 0x00); 252 /* filter setting, high path, offet clear */ 253 wm8739_write(sd, R5, 0x000); 254 /* ADC, OSC, Power Off mode Disable */ 255 wm8739_write(sd, R6, 0x000); 256 /* Digital Audio interface format: 257 Enable Master mode, 24 bit, MSB first/left justified */ 258 wm8739_write(sd, R7, 0x049); 259 /* sampling control: normal, 256fs, 48KHz sampling rate */ 260 wm8739_write(sd, R8, 0x000); 261 /* activate */ 262 wm8739_write(sd, R9, 0x001); 263 /* set volume/mute */ 264 v4l2_ctrl_handler_setup(&state->hdl); 265 return 0; 266} 267 268static int wm8739_remove(struct i2c_client *client) 269{ 270 struct v4l2_subdev *sd = i2c_get_clientdata(client); 271 struct wm8739_state *state = to_state(sd); 272 273 v4l2_device_unregister_subdev(sd); 274 v4l2_ctrl_handler_free(&state->hdl); 275 kfree(to_state(sd)); 276 return 0; 277} 278 279static const struct i2c_device_id wm8739_id[] = { 280 { "wm8739", 0 }, 281 { } 282}; 283MODULE_DEVICE_TABLE(i2c, wm8739_id); 284 285static struct v4l2_i2c_driver_data v4l2_i2c_data = { 286 .name = "wm8739", 287 .probe = wm8739_probe, 288 .remove = wm8739_remove, 289 .id_table = wm8739_id, 290}; 291