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 <asm/uaccess.h> 33#include <linux/i2c.h> 34#include <linux/i2c-id.h> 35#include <linux/videodev2.h> 36#include <media/v4l2-device.h> 37#include <media/v4l2-chip-ident.h> 38#include <media/v4l2-ctrls.h> 39#include <media/v4l2-i2c-drv.h> 40 41MODULE_DESCRIPTION("wm8775 driver"); 42MODULE_AUTHOR("Ulf Eklund, Hans Verkuil"); 43MODULE_LICENSE("GPL"); 44 45 46 47/* ----------------------------------------------------------------------- */ 48 49enum { 50 R7 = 7, R11 = 11, 51 R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23, 52 TOT_REGS 53}; 54 55struct wm8775_state { 56 struct v4l2_subdev sd; 57 struct v4l2_ctrl_handler hdl; 58 struct v4l2_ctrl *mute; 59 u8 input; /* Last selected input (0-0xf) */ 60}; 61 62static inline struct wm8775_state *to_state(struct v4l2_subdev *sd) 63{ 64 return container_of(sd, struct wm8775_state, sd); 65} 66 67static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 68{ 69 return &container_of(ctrl->handler, struct wm8775_state, hdl)->sd; 70} 71 72static int wm8775_write(struct v4l2_subdev *sd, int reg, u16 val) 73{ 74 struct i2c_client *client = v4l2_get_subdevdata(sd); 75 int i; 76 77 if (reg < 0 || reg >= TOT_REGS) { 78 v4l2_err(sd, "Invalid register R%d\n", reg); 79 return -1; 80 } 81 82 for (i = 0; i < 3; i++) 83 if (i2c_smbus_write_byte_data(client, 84 (reg << 1) | (val >> 8), val & 0xff) == 0) 85 return 0; 86 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg); 87 return -1; 88} 89 90static int wm8775_s_routing(struct v4l2_subdev *sd, 91 u32 input, u32 output, u32 config) 92{ 93 struct wm8775_state *state = to_state(sd); 94 95 /* There are 4 inputs and one output. Zero or more inputs 96 are multiplexed together to the output. Hence there are 97 16 combinations. 98 If only one input is active (the normal case) then the 99 input values 1, 2, 4 or 8 should be used. */ 100 if (input > 15) { 101 v4l2_err(sd, "Invalid input %d.\n", input); 102 return -EINVAL; 103 } 104 state->input = input; 105 if (!v4l2_ctrl_g_ctrl(state->mute)) 106 return 0; 107 wm8775_write(sd, R21, 0x0c0); 108 wm8775_write(sd, R14, 0x1d4); 109 wm8775_write(sd, R15, 0x1d4); 110 wm8775_write(sd, R21, 0x100 + state->input); 111 return 0; 112} 113 114static int wm8775_s_ctrl(struct v4l2_ctrl *ctrl) 115{ 116 struct v4l2_subdev *sd = to_sd(ctrl); 117 struct wm8775_state *state = to_state(sd); 118 119 switch (ctrl->id) { 120 case V4L2_CID_AUDIO_MUTE: 121 wm8775_write(sd, R21, 0x0c0); 122 wm8775_write(sd, R14, 0x1d4); 123 wm8775_write(sd, R15, 0x1d4); 124 if (!ctrl->val) 125 wm8775_write(sd, R21, 0x100 + state->input); 126 return 0; 127 } 128 return -EINVAL; 129} 130 131static int wm8775_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 132{ 133 struct i2c_client *client = v4l2_get_subdevdata(sd); 134 135 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8775, 0); 136} 137 138static int wm8775_log_status(struct v4l2_subdev *sd) 139{ 140 struct wm8775_state *state = to_state(sd); 141 142 v4l2_info(sd, "Input: %d\n", state->input); 143 v4l2_ctrl_handler_log_status(&state->hdl, sd->name); 144 return 0; 145} 146 147static int wm8775_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *freq) 148{ 149 struct wm8775_state *state = to_state(sd); 150 151 /* If I remove this, then it can happen that I have no 152 sound the first time I tune from static to a valid channel. 153 It's difficult to reproduce and is almost certainly related 154 to the zero cross detect circuit. */ 155 wm8775_write(sd, R21, 0x0c0); 156 wm8775_write(sd, R14, 0x1d4); 157 wm8775_write(sd, R15, 0x1d4); 158 wm8775_write(sd, R21, 0x100 + state->input); 159 return 0; 160} 161 162/* ----------------------------------------------------------------------- */ 163 164static const struct v4l2_ctrl_ops wm8775_ctrl_ops = { 165 .s_ctrl = wm8775_s_ctrl, 166}; 167 168static const struct v4l2_subdev_core_ops wm8775_core_ops = { 169 .log_status = wm8775_log_status, 170 .g_chip_ident = wm8775_g_chip_ident, 171 .g_ext_ctrls = v4l2_subdev_g_ext_ctrls, 172 .try_ext_ctrls = v4l2_subdev_try_ext_ctrls, 173 .s_ext_ctrls = v4l2_subdev_s_ext_ctrls, 174 .g_ctrl = v4l2_subdev_g_ctrl, 175 .s_ctrl = v4l2_subdev_s_ctrl, 176 .queryctrl = v4l2_subdev_queryctrl, 177 .querymenu = v4l2_subdev_querymenu, 178}; 179 180static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = { 181 .s_frequency = wm8775_s_frequency, 182}; 183 184static const struct v4l2_subdev_audio_ops wm8775_audio_ops = { 185 .s_routing = wm8775_s_routing, 186}; 187 188static const struct v4l2_subdev_ops wm8775_ops = { 189 .core = &wm8775_core_ops, 190 .tuner = &wm8775_tuner_ops, 191 .audio = &wm8775_audio_ops, 192}; 193 194/* ----------------------------------------------------------------------- */ 195 196/* i2c implementation */ 197 198/* 199 * Generic i2c probe 200 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 201 */ 202 203static int wm8775_probe(struct i2c_client *client, 204 const struct i2c_device_id *id) 205{ 206 struct wm8775_state *state; 207 struct v4l2_subdev *sd; 208 209 /* Check if the adapter supports the needed features */ 210 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 211 return -EIO; 212 213 v4l_info(client, "chip found @ 0x%02x (%s)\n", 214 client->addr << 1, client->adapter->name); 215 216 state = kzalloc(sizeof(struct wm8775_state), GFP_KERNEL); 217 if (state == NULL) 218 return -ENOMEM; 219 sd = &state->sd; 220 v4l2_i2c_subdev_init(sd, client, &wm8775_ops); 221 state->input = 2; 222 223 v4l2_ctrl_handler_init(&state->hdl, 1); 224 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, 225 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 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 kfree(state); 232 return err; 233 } 234 235 /* Initialize wm8775 */ 236 237 /* RESET */ 238 wm8775_write(sd, R23, 0x000); 239 /* Disable zero cross detect timeout */ 240 wm8775_write(sd, R7, 0x000); 241 /* Left justified, 24-bit mode */ 242 wm8775_write(sd, R11, 0x021); 243 /* Master mode, clock ratio 256fs */ 244 wm8775_write(sd, R12, 0x102); 245 /* Powered up */ 246 wm8775_write(sd, R13, 0x000); 247 /* ADC gain +2.5dB, enable zero cross */ 248 wm8775_write(sd, R14, 0x1d4); 249 /* ADC gain +2.5dB, enable zero cross */ 250 wm8775_write(sd, R15, 0x1d4); 251 /* ALC Stereo, ALC target level -1dB FS max gain +8dB */ 252 wm8775_write(sd, R16, 0x1bf); 253 /* Enable gain control, use zero cross detection, 254 ALC hold time 42.6 ms */ 255 wm8775_write(sd, R17, 0x185); 256 /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */ 257 wm8775_write(sd, R18, 0x0a2); 258 /* Enable noise gate, threshold -72dBfs */ 259 wm8775_write(sd, R19, 0x005); 260 /* Transient window 4ms, lower PGA gain limit -1dB */ 261 wm8775_write(sd, R20, 0x07a); 262 /* LRBOTH = 1, use input 2. */ 263 wm8775_write(sd, R21, 0x102); 264 return 0; 265} 266 267static int wm8775_remove(struct i2c_client *client) 268{ 269 struct v4l2_subdev *sd = i2c_get_clientdata(client); 270 struct wm8775_state *state = to_state(sd); 271 272 v4l2_device_unregister_subdev(sd); 273 v4l2_ctrl_handler_free(&state->hdl); 274 kfree(state); 275 return 0; 276} 277 278static const struct i2c_device_id wm8775_id[] = { 279 { "wm8775", 0 }, 280 { } 281}; 282MODULE_DEVICE_TABLE(i2c, wm8775_id); 283 284static struct v4l2_i2c_driver_data v4l2_i2c_data = { 285 .name = "wm8775", 286 .probe = wm8775_probe, 287 .remove = wm8775_remove, 288 .id_table = wm8775_id, 289}; 290