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
  26 #define DRIVER_DESC "WL1273 FM Radio Core"
  27
  28 static const struct i2c_device_id wl1273_driver_id_table[] = {
  29         { WL1273_FM_DRIVER_NAME, 0 },
  30         { }
  31 };
  32 MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
  33
  34 static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
  35 {
  36         struct i2c_client *client = core->client;
  37         u8 b[2];
  38         int r;
  39
  40         r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
  41         if (r != 2) {
  42                 dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg);
  43                 return -EREMOTEIO;
  44         }
  45
  46         *value = (u16)b[0] << 8 | b[1];
  47
  48         return 0;
  49 }
  50
  51 static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
  52 {
  53         struct i2c_client *client = core->client;
  54         u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
  55         int r;
  56
  57         r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
  58         if (r) {
  59                 dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd);
  60                 return r;
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
  67 {
  68         struct i2c_client *client = core->client;
  69         struct i2c_msg msg;
  70         int r;
  71
  72         msg.addr = client->addr;
  73         msg.flags = 0;
  74         msg.buf = data;
  75         msg.len = len;
  76
  77         r = i2c_transfer(client->adapter, &msg, 1);
  78         if (r != 1) {
  79                 dev_err(&client->dev, "%s: write error.\n", __func__);
  80                 return -EREMOTEIO;
  81         }
  82
  83         return 0;
  84 }
  85
  86 /**
  87  * wl1273_fm_set_audio() -      Set audio mode.
  88  * @core:                       A pointer to the device struct.
  89  * @new_mode:                   The new audio mode.
  90  *
  91  * Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
  92  */
  93 static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
  94 {
  95         int r = 0;
  96
  97         if (core->mode == WL1273_MODE_OFF ||
  98             core->mode == WL1273_MODE_SUSPENDED)
  99                 return -EPERM;
 100
 101         if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
 102                 r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
 103                                         WL1273_PCM_DEF_MODE);
 104                 if (r)
 105                         goto out;
 106
 107                 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
 108                                         core->i2s_mode);
 109                 if (r)
 110                         goto out;
 111
 112                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
 113                                         WL1273_AUDIO_ENABLE_I2S);
 114                 if (r)
 115                         goto out;
 116
 117         } else if (core->mode == WL1273_MODE_RX &&
 118                    new_mode == WL1273_AUDIO_ANALOG) {
 119                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
 120                                         WL1273_AUDIO_ENABLE_ANALOG);
 121                 if (r)
 122                         goto out;
 123
 124         } else if (core->mode == WL1273_MODE_TX &&
 125                    new_mode == WL1273_AUDIO_DIGITAL) {
 126                 r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
 127                                         core->i2s_mode);
 128                 if (r)
 129                         goto out;
 130
 131                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
 132                                         WL1273_AUDIO_IO_SET_I2S);
 133                 if (r)
 134                         goto out;
 135
 136         } else if (core->mode == WL1273_MODE_TX &&
 137                    new_mode == WL1273_AUDIO_ANALOG) {
 138                 r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
 139                                         WL1273_AUDIO_IO_SET_ANALOG);
 140                 if (r)
 141                         goto out;
 142         }
 143
 144         core->audio_mode = new_mode;
 145 out:
 146         return r;
 147 }
 148
 149 /**
 150  * wl1273_fm_set_volume() -     Set volume.
 151  * @core:                       A pointer to the device struct.
 152  * @volume:                     The new volume value.
 153  */
 154 static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
 155 {
 156         int r;
 157
 158         if (volume > WL1273_MAX_VOLUME)
 159                 return -EINVAL;
 160
 161         if (core->volume == volume)
 162                 return 0;
 163
 164         r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
 165         if (r)
 166                 return r;
 167
 168         core->volume = volume;
 169         return 0;
 170 }
 171
 172 static int wl1273_core_remove(struct i2c_client *client)
 173 {
 174         struct wl1273_core *core = i2c_get_clientdata(client);
 175
 176         dev_dbg(&client->dev, "%s\n", __func__);
 177
 178         mfd_remove_devices(&client->dev);
 179         kfree(core);
 180
 181         return 0;
 182 }
 183
 184 static int __devinit wl1273_core_probe(struct i2c_client *client,
 185                                        const struct i2c_device_id *id)
 186 {
 187         struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
 188         struct wl1273_core *core;
 189         struct mfd_cell *cell;
 190         int children = 0;
 191         int r = 0;
 192
 193         dev_dbg(&client->dev, "%s\n", __func__);
 194
 195         if (!pdata) {
 196                 dev_err(&client->dev, "No platform data.\n");
 197                 return -EINVAL;
 198         }
 199
 200         if (!(pdata->children & WL1273_RADIO_CHILD)) {
 201                 dev_err(&client->dev, "Cannot function without radio child.\n");
 202                 return -EINVAL;
 203         }
 204
 205         core = kzalloc(sizeof(*core), GFP_KERNEL);
 206         if (!core)
 207                 return -ENOMEM;
 208
 209         core->pdata = pdata;
 210         core->client = client;
 211         mutex_init(&core->lock);
 212
 213         i2c_set_clientdata(client, core);
 214
 215         dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
 216
 217         cell = &core->cells[children];
 218         cell->name = "wl1273_fm_radio";
 219         cell->platform_data = &core;
 220         cell->pdata_size = sizeof(core);
 221         children++;
 222
 223         core->read = wl1273_fm_read_reg;
 224         core->write = wl1273_fm_write_cmd;
 225         core->write_data = wl1273_fm_write_data;
 226         core->set_audio = wl1273_fm_set_audio;
 227         core->set_volume = wl1273_fm_set_volume;
 228
 229         if (pdata->children & WL1273_CODEC_CHILD) {
 230                 cell = &core->cells[children];
 231
 232                 dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
 233                 cell->name = "wl1273-codec";
 234                 cell->platform_data = &core;
 235                 cell->pdata_size = sizeof(core);
 236                 children++;
 237         }
 238
 239         dev_dbg(&client->dev, "%s: number of children: %d.\n",
 240                 __func__, children);
 241
 242         r = mfd_add_devices(&client->dev, -1, core->cells,
 243                             children, NULL, 0);
 244         if (r)
 245                 goto err;
 246
 247         return 0;
 248
 249 err:
 250         pdata->free_resources();
 251         kfree(core);
 252
 253         dev_dbg(&client->dev, "%s\n", __func__);
 254
 255         return r;
 256 }
 257
 258 static struct i2c_driver wl1273_core_driver = {
 259         .driver = {
 260                 .name = WL1273_FM_DRIVER_NAME,
 261         },
 262         .probe = wl1273_core_probe,
 263         .id_table = wl1273_driver_id_table,
 264         .remove = __devexit_p(wl1273_core_remove),
 265 };
 266
 267 static int __init wl1273_core_init(void)
 268 {
 269         int r;
 270
 271         r = i2c_add_driver(&wl1273_core_driver);
 272         if (r) {
 273                 pr_err(WL1273_FM_DRIVER_NAME
 274                        ": driver registration failed\n");
 275                 return r;
 276         }
 277
 278         return r;
 279 }
 280
 281 static void __exit wl1273_core_exit(void)
 282 {
 283         i2c_del_driver(&wl1273_core_driver);
 284 }
 285 late_initcall(wl1273_core_init);
 286 module_exit(wl1273_core_exit);
 287
 288 MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
 289 MODULE_DESCRIPTION(DRIVER_DESC);
 290 MODULE_LICENSE("GPL");