1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * wm8739 4 * 5 * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com> 6 * 7 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl> 8 * - Cleanup 9 */ 10 11 #include <linux/module.h> 12 #include <linux/types.h> 13 #include <linux/slab.h> 14 #include <linux/ioctl.h> 15 #include <linux/uaccess.h> 16 #include <linux/i2c.h> 17 #include <linux/videodev2.h> 18 #include <media/v4l2-device.h> 19 #include <media/v4l2-ctrls.h> 20 21 MODULE_DESCRIPTION("wm8739 driver"); 22 MODULE_AUTHOR("T. Adachi, Hans Verkuil"); 23 MODULE_LICENSE("GPL"); 24 25 static int debug; 26 27 module_param(debug, int, 0644); 28 29 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 30 31 32 /* ------------------------------------------------------------------------ */ 33 34 enum { 35 R0 = 0, R1, 36 R5 = 5, R6, R7, R8, R9, R15 = 15, 37 TOT_REGS 38 }; 39 40 struct wm8739_state { 41 struct v4l2_subdev sd; 42 struct v4l2_ctrl_handler hdl; 43 struct { 44 /* audio cluster */ 45 struct v4l2_ctrl *volume; 46 struct v4l2_ctrl *mute; 47 struct v4l2_ctrl *balance; 48 }; 49 u32 clock_freq; 50 }; 51 52 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd) 53 { 54 return container_of(sd, struct wm8739_state, sd); 55 } 56 57 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 58 { 59 return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd; 60 } 61 62 /* ------------------------------------------------------------------------ */ 63 64 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val) 65 { 66 struct i2c_client *client = v4l2_get_subdevdata(sd); 67 int i; 68 69 if (reg < 0 || reg >= TOT_REGS) { 70 v4l2_err(sd, "Invalid register R%d\n", reg); 71 return -1; 72 } 73 74 v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val); 75 76 for (i = 0; i < 3; i++) 77 if (i2c_smbus_write_byte_data(client, 78 (reg << 1) | (val >> 8), val & 0xff) == 0) 79 return 0; 80 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg); 81 return -1; 82 } 83 84 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl) 85 { 86 struct v4l2_subdev *sd = to_sd(ctrl); 87 struct wm8739_state *state = to_state(sd); 88 unsigned int work_l, work_r; 89 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 90 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ 91 u16 mute; 92 93 switch (ctrl->id) { 94 case V4L2_CID_AUDIO_VOLUME: 95 break; 96 97 default: 98 return -EINVAL; 99 } 100 101 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */ 102 work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768; 103 work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768; 104 105 vol_l = (long)work_l * 31 / 65535; 106 vol_r = (long)work_r * 31 / 65535; 107 108 /* set audio volume etc. */ 109 mute = state->mute->val ? 0x80 : 0; 110 111 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB 112 * Default setting: 0x17 = 0 dB 113 */ 114 wm8739_write(sd, R0, (vol_l & 0x1f) | mute); 115 wm8739_write(sd, R1, (vol_r & 0x1f) | mute); 116 return 0; 117 } 118 119 /* ------------------------------------------------------------------------ */ 120 121 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq) 122 { 123 struct wm8739_state *state = to_state(sd); 124 125 state->clock_freq = audiofreq; 126 /* de-activate */ 127 wm8739_write(sd, R9, 0x000); 128 switch (audiofreq) { 129 case 44100: 130 /* 256fps, fs=44.1k */ 131 wm8739_write(sd, R8, 0x020); 132 break; 133 case 48000: 134 /* 256fps, fs=48k */ 135 wm8739_write(sd, R8, 0x000); 136 break; 137 case 32000: 138 /* 256fps, fs=32k */ 139 wm8739_write(sd, R8, 0x018); 140 break; 141 default: 142 break; 143 } 144 /* activate */ 145 wm8739_write(sd, R9, 0x001); 146 return 0; 147 } 148 149 static int wm8739_log_status(struct v4l2_subdev *sd) 150 { 151 struct wm8739_state *state = to_state(sd); 152 153 v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq); 154 v4l2_ctrl_handler_log_status(&state->hdl, sd->name); 155 return 0; 156 } 157 158 /* ----------------------------------------------------------------------- */ 159 160 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = { 161 .s_ctrl = wm8739_s_ctrl, 162 }; 163 164 static const struct v4l2_subdev_core_ops wm8739_core_ops = { 165 .log_status = wm8739_log_status, 166 }; 167 168 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = { 169 .s_clock_freq = wm8739_s_clock_freq, 170 }; 171 172 static const struct v4l2_subdev_ops wm8739_ops = { 173 .core = &wm8739_core_ops, 174 .audio = &wm8739_audio_ops, 175 }; 176 177 /* ------------------------------------------------------------------------ */ 178 179 /* i2c implementation */ 180 181 static int wm8739_probe(struct i2c_client *client) 182 { 183 struct wm8739_state *state; 184 struct v4l2_subdev *sd; 185 186 /* Check if the adapter supports the needed features */ 187 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 188 return -EIO; 189 190 v4l_info(client, "chip found @ 0x%x (%s)\n", 191 client->addr << 1, client->adapter->name); 192 193 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); 194 if (state == NULL) 195 return -ENOMEM; 196 sd = &state->sd; 197 v4l2_i2c_subdev_init(sd, client, &wm8739_ops); 198 v4l2_ctrl_handler_init(&state->hdl, 2); 199 state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 200 V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736); 201 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 202 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 203 state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, 204 V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768); 205 sd->ctrl_handler = &state->hdl; 206 if (state->hdl.error) { 207 int err = state->hdl.error; 208 209 v4l2_ctrl_handler_free(&state->hdl); 210 return err; 211 } 212 v4l2_ctrl_cluster(3, &state->volume); 213 214 state->clock_freq = 48000; 215 216 /* Initialize wm8739 */ 217 218 /* reset */ 219 wm8739_write(sd, R15, 0x00); 220 /* filter setting, high path, offet clear */ 221 wm8739_write(sd, R5, 0x000); 222 /* ADC, OSC, Power Off mode Disable */ 223 wm8739_write(sd, R6, 0x000); 224 /* Digital Audio interface format: 225 Enable Master mode, 24 bit, MSB first/left justified */ 226 wm8739_write(sd, R7, 0x049); 227 /* sampling control: normal, 256fs, 48KHz sampling rate */ 228 wm8739_write(sd, R8, 0x000); 229 /* activate */ 230 wm8739_write(sd, R9, 0x001); 231 /* set volume/mute */ 232 v4l2_ctrl_handler_setup(&state->hdl); 233 return 0; 234 } 235 236 static void wm8739_remove(struct i2c_client *client) 237 { 238 struct v4l2_subdev *sd = i2c_get_clientdata(client); 239 struct wm8739_state *state = to_state(sd); 240 241 v4l2_device_unregister_subdev(sd); 242 v4l2_ctrl_handler_free(&state->hdl); 243 } 244 245 static const struct i2c_device_id wm8739_id[] = { 246 { "wm8739", 0 }, 247 { } 248 }; 249 MODULE_DEVICE_TABLE(i2c, wm8739_id); 250 251 static struct i2c_driver wm8739_driver = { 252 .driver = { 253 .name = "wm8739", 254 }, 255 .probe = wm8739_probe, 256 .remove = wm8739_remove, 257 .id_table = wm8739_id, 258 }; 259 260 module_i2c_driver(wm8739_driver); 261