1 /* 2 * tlv320aic23b - driver version 0.0.1 3 * 4 * Copyright (C) 2006 Scott Alfter <salfter@ssai.us> 5 * 6 * Based on wm8775 driver 7 * 8 * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to> 9 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 */ 25 26 #include <linux/module.h> 27 #include <linux/types.h> 28 #include <linux/slab.h> 29 #include <linux/ioctl.h> 30 #include <asm/uaccess.h> 31 #include <linux/i2c.h> 32 #include <linux/videodev2.h> 33 #include <media/v4l2-device.h> 34 #include <media/v4l2-ctrls.h> 35 36 MODULE_DESCRIPTION("tlv320aic23b driver"); 37 MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil"); 38 MODULE_LICENSE("GPL"); 39 40 41 /* ----------------------------------------------------------------------- */ 42 43 struct tlv320aic23b_state { 44 struct v4l2_subdev sd; 45 struct v4l2_ctrl_handler hdl; 46 }; 47 48 static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd) 49 { 50 return container_of(sd, struct tlv320aic23b_state, sd); 51 } 52 53 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) 54 { 55 return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd; 56 } 57 58 static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val) 59 { 60 struct i2c_client *client = v4l2_get_subdevdata(sd); 61 int i; 62 63 if ((reg < 0 || reg > 9) && (reg != 15)) { 64 v4l2_err(sd, "Invalid register R%d\n", reg); 65 return -1; 66 } 67 68 for (i = 0; i < 3; i++) 69 if (i2c_smbus_write_byte_data(client, 70 (reg << 1) | (val >> 8), val & 0xff) == 0) 71 return 0; 72 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg); 73 return -1; 74 } 75 76 static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq) 77 { 78 switch (freq) { 79 case 32000: /* set sample rate to 32 kHz */ 80 tlv320aic23b_write(sd, 8, 0x018); 81 break; 82 case 44100: /* set sample rate to 44.1 kHz */ 83 tlv320aic23b_write(sd, 8, 0x022); 84 break; 85 case 48000: /* set sample rate to 48 kHz */ 86 tlv320aic23b_write(sd, 8, 0x000); 87 break; 88 default: 89 return -EINVAL; 90 } 91 return 0; 92 } 93 94 static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl) 95 { 96 struct v4l2_subdev *sd = to_sd(ctrl); 97 98 switch (ctrl->id) { 99 case V4L2_CID_AUDIO_MUTE: 100 tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */ 101 /* set gain on both channels to +3.0 dB */ 102 if (!ctrl->val) 103 tlv320aic23b_write(sd, 0, 0x119); 104 return 0; 105 } 106 return -EINVAL; 107 } 108 109 static int tlv320aic23b_log_status(struct v4l2_subdev *sd) 110 { 111 struct tlv320aic23b_state *state = to_state(sd); 112 113 v4l2_ctrl_handler_log_status(&state->hdl, sd->name); 114 return 0; 115 } 116 117 /* ----------------------------------------------------------------------- */ 118 119 static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = { 120 .s_ctrl = tlv320aic23b_s_ctrl, 121 }; 122 123 static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = { 124 .log_status = tlv320aic23b_log_status, 125 }; 126 127 static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = { 128 .s_clock_freq = tlv320aic23b_s_clock_freq, 129 }; 130 131 static const struct v4l2_subdev_ops tlv320aic23b_ops = { 132 .core = &tlv320aic23b_core_ops, 133 .audio = &tlv320aic23b_audio_ops, 134 }; 135 136 /* ----------------------------------------------------------------------- */ 137 138 /* i2c implementation */ 139 140 /* 141 * Generic i2c probe 142 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' 143 */ 144 145 static int tlv320aic23b_probe(struct i2c_client *client, 146 const struct i2c_device_id *id) 147 { 148 struct tlv320aic23b_state *state; 149 struct v4l2_subdev *sd; 150 151 /* Check if the adapter supports the needed features */ 152 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 153 return -EIO; 154 155 v4l_info(client, "chip found @ 0x%x (%s)\n", 156 client->addr << 1, client->adapter->name); 157 158 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); 159 if (state == NULL) 160 return -ENOMEM; 161 sd = &state->sd; 162 v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops); 163 164 /* Initialize tlv320aic23b */ 165 166 /* RESET */ 167 tlv320aic23b_write(sd, 15, 0x000); 168 /* turn off DAC & mic input */ 169 tlv320aic23b_write(sd, 6, 0x00A); 170 /* left-justified, 24-bit, master mode */ 171 tlv320aic23b_write(sd, 7, 0x049); 172 /* set gain on both channels to +3.0 dB */ 173 tlv320aic23b_write(sd, 0, 0x119); 174 /* set sample rate to 48 kHz */ 175 tlv320aic23b_write(sd, 8, 0x000); 176 /* activate digital interface */ 177 tlv320aic23b_write(sd, 9, 0x001); 178 179 v4l2_ctrl_handler_init(&state->hdl, 1); 180 v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops, 181 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); 182 sd->ctrl_handler = &state->hdl; 183 if (state->hdl.error) { 184 int err = state->hdl.error; 185 186 v4l2_ctrl_handler_free(&state->hdl); 187 return err; 188 } 189 v4l2_ctrl_handler_setup(&state->hdl); 190 return 0; 191 } 192 193 static int tlv320aic23b_remove(struct i2c_client *client) 194 { 195 struct v4l2_subdev *sd = i2c_get_clientdata(client); 196 struct tlv320aic23b_state *state = to_state(sd); 197 198 v4l2_device_unregister_subdev(sd); 199 v4l2_ctrl_handler_free(&state->hdl); 200 return 0; 201 } 202 203 /* ----------------------------------------------------------------------- */ 204 205 static const struct i2c_device_id tlv320aic23b_id[] = { 206 { "tlv320aic23b", 0 }, 207 { } 208 }; 209 MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id); 210 211 static struct i2c_driver tlv320aic23b_driver = { 212 .driver = { 213 .owner = THIS_MODULE, 214 .name = "tlv320aic23b", 215 }, 216 .probe = tlv320aic23b_probe, 217 .remove = tlv320aic23b_remove, 218 .id_table = tlv320aic23b_id, 219 }; 220 221 module_i2c_driver(tlv320aic23b_driver); 222