kernel/drivers/mfd/wl1273-core.c

   1 /*
   2  * MFD driver for wl1273 FM radio and audio codec submodules.
   3  *
   4  * Copyright (C) 2011 Nokia Corporation
   5  * Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  19  * 02110-1301 USA
  20  *
  21  */
  22
  23 #include <linux/mfd/wl1273-core.h>
  24 #include <linux/slab.h>
  25 #include <linux/module.h>
  26
  27 #define DRIVER_DESC "WL1273 FM Radio Core"
  28
  29 static const struct i2c_device_id wl1273_driver_id_table[] = {
  30         { WL1273_FM_DRIVER_NAME, 0 },
  31         { }
  32 };
  33 MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
  34
  35 static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
  36 {
  37         struct i2c_client *client = core->client;
  38         u8 b[2];
  39         int r;
  40
  41         r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
  42         if (r != 2) {
  43                 dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg);
  44                 return -EREMOTEIO;
  45         }
  46
  47         *value = (u16)b[0] << 8 | b[1];
  48
  49         return 0;
  50 }
  51
  52 static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
  53 {
  54         struct i2c_client *client = core->client;
  55         u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
  56         int r;
  57
  58         r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
  59         if (r) {
  60                 dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd);
  61                 return r;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
  68 {
  69         struct i2c_client *client = core->client;
  70         struct i2c_msg msg;
  71         int r;
  72
  73         msg.addr = client->addr;
  74         msg.flags = 0;
  75         msg.buf = data;
  76         msg.len = len;
  77
  78         r = i2c_transfer(client->adapter, &msg, 1);
  79         if (r != 1) {
  80                 dev_err(&client->dev, "%s: write error.\n", __func__);
  81                 return -EREMOTEIO;
  82         }
  83
  84         return 0;
  85 }
  86
  87 /**
  88  * wl1273_fm_set_audio() -      Set audio mode.
  89  * @core:                       A pointer to the device struct.
  90  * @new_mode:                   The new audio mode.
  91  *
  92  * Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
  93  */
  94 static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
  95 {
  96         int r = 0;
  97
  98         if (core->mode == WL1273_MODE_OFF ||
  99             core->mode == WL1273_MODE_SUSPENDED)
 100                 return -EPERM;
 101
 102         if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
 103                 r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
 104                                         WL1273_PCM_DEF_MODE);
 105                 if (r)
 106                         goto out;
 107
 108                 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
 109                                         core->i2s_mode);
 110                 if (r)
 111                         goto out;
 112
 113                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
 114                                         WL1273_AUDIO_ENABLE_I2S);
 115                 if (r)
 116                         goto out;
 117
 118         } else if (core->mode == WL1273_MODE_RX &&
 119                    new_mode == WL1273_AUDIO_ANALOG) {
 120                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
 121                                         WL1273_AUDIO_ENABLE_ANALOG);
 122                 if (r)
 123                         goto out;
 124
 125         } else if (core->mode == WL1273_MODE_TX &&
 126                    new_mode == WL1273_AUDIO_DIGITAL) {
 127                 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
 128                                         core->i2s_mode);
 129                 if (r)
 130                         goto out;
 131
 132                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
 133                                         WL1273_AUDIO_IO_SET_I2S);
 134                 if (r)
 135                         goto out;
 136
 137         } else if (core->mode == WL1273_MODE_TX &&
 138                    new_mode == WL1273_AUDIO_ANALOG) {
 139                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
 140                                         WL1273_AUDIO_IO_SET_ANALOG);
 141                 if (r)
 142                         goto out;
 143         }
 144
 145         core->audio_mode = new_mode;
 146 out:
 147         return r;
 148 }
 149
 150 /**
 151  * wl1273_fm_set_volume() -     Set volume.
 152  * @core:                       A pointer to the device struct.
 153  * @volume:                     The new volume value.
 154  */
 155 static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
 156 {
 157         int r;
 158
 159         if (volume > WL1273_MAX_VOLUME)
 160                 return -EINVAL;
 161
 162         if (core->volume == volume)
 163                 return 0;
 164
 165         r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
 166         if (r)
 167                 return r;
 168
 169         core->volume = volume;
 170         return 0;
 171 }
 172
 173 static int wl1273_core_remove(struct i2c_client *client)
 174 {
 175         dev_dbg(&client->dev, "%s\n", __func__);
 176
 177         mfd_remove_devices(&client->dev);
 178
 179         return 0;
 180 }
 181
 182 static int wl1273_core_probe(struct i2c_client *client,
 183                                        const struct i2c_device_id *id)
 184 {
 185         struct wl1273_fm_platform_data *pdata = dev_get_platdata(&client->dev);
 186         struct wl1273_core *core;
 187         struct mfd_cell *cell;
 188         int children = 0;
 189         int r = 0;
 190
 191         dev_dbg(&client->dev, "%s\n", __func__);
 192
 193         if (!pdata) {
 194                 dev_err(&client->dev, "No platform data.\n");
 195                 return -EINVAL;
 196         }
 197
 198         if (!(pdata->children & WL1273_RADIO_CHILD)) {
 199                 dev_err(&client->dev, "Cannot function without radio child.\n");
 200                 return -EINVAL;
 201         }
 202
 203         core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
 204         if (!core)
 205                 return -ENOMEM;
 206
 207         core->pdata = pdata;
 208         core->client = client;
 209         mutex_init(&core->lock);
 210
 211         i2c_set_clientdata(client, core);
 212
 213         dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
 214
 215         cell = &core->cells[children];
 216         cell->name = "wl1273_fm_radio";
 217         cell->platform_data = &core;
 218         cell->pdata_size = sizeof(core);
 219         children++;
 220
 221         core->read = wl1273_fm_read_reg;
 222         core->write = wl1273_fm_write_cmd;
 223         core->write_data = wl1273_fm_write_data;
 224         core->set_audio = wl1273_fm_set_audio;
 225         core->set_volume = wl1273_fm_set_volume;
 226
 227         if (pdata->children & WL1273_CODEC_CHILD) {
 228                 cell = &core->cells[children];
 229
 230                 dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
 231                 cell->name = "wl1273-codec";
 232                 cell->platform_data = &core;
 233                 cell->pdata_size = sizeof(core);
 234                 children++;
 235         }
 236
 237         dev_dbg(&client->dev, "%s: number of children: %d.\n",
 238                 __func__, children);
 239
 240         r = mfd_add_devices(&client->dev, -1, core->cells,
 241                             children, NULL, 0, NULL);
 242         if (r)
 243                 goto err;
 244
 245         return 0;
 246
 247 err:
 248         pdata->free_resources();
 249
 250         dev_dbg(&client->dev, "%s\n", __func__);
 251
 252         return r;
 253 }
 254
 255 static struct i2c_driver wl1273_core_driver = {
 256         .driver = {
 257                 .name = WL1273_FM_DRIVER_NAME,
 258         },
 259         .probe = wl1273_core_probe,
 260         .id_table = wl1273_driver_id_table,
 261         .remove = wl1273_core_remove,
 262 };
 263
 264 static int __init wl1273_core_init(void)
 265 {
 266         int r;
 267
 268         r = i2c_add_driver(&wl1273_core_driver);
 269         if (r) {
 270                 pr_err(WL1273_FM_DRIVER_NAME
 271                        ": driver registration failed\n");
 272                 return r;
 273         }
 274
 275         return r;
 276 }
 277
 278 static void __exit wl1273_core_exit(void)
 279 {
 280         i2c_del_driver(&wl1273_core_driver);
 281 }
 282 late_initcall(wl1273_core_init);
 283 module_exit(wl1273_core_exit);
 284
 285 MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
 286 MODULE_DESCRIPTION(DRIVER_DESC);
 287 MODULE_LICENSE("GPL");