linux/drivers/mfd/wl1273-core.c
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   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
  29static const struct i2c_device_id wl1273_driver_id_table[] = {
  30        { WL1273_FM_DRIVER_NAME, 0 },
  31        { }
  32};
  33MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
  34
  35static 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
  52static 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
  67static 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 */
  94static 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;
 146out:
 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 */
 155static 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
 173static int wl1273_core_remove(struct i2c_client *client)
 174{
 175        struct wl1273_core *core = i2c_get_clientdata(client);
 176
 177        dev_dbg(&client->dev, "%s\n", __func__);
 178
 179        mfd_remove_devices(&client->dev);
 180        kfree(core);
 181
 182        return 0;
 183}
 184
 185static int __devinit wl1273_core_probe(struct i2c_client *client,
 186                                       const struct i2c_device_id *id)
 187{
 188        struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
 189        struct wl1273_core *core;
 190        struct mfd_cell *cell;
 191        int children = 0;
 192        int r = 0;
 193
 194        dev_dbg(&client->dev, "%s\n", __func__);
 195
 196        if (!pdata) {
 197                dev_err(&client->dev, "No platform data.\n");
 198                return -EINVAL;
 199        }
 200
 201        if (!(pdata->children & WL1273_RADIO_CHILD)) {
 202                dev_err(&client->dev, "Cannot function without radio child.\n");
 203                return -EINVAL;
 204        }
 205
 206        core = kzalloc(sizeof(*core), GFP_KERNEL);
 207        if (!core)
 208                return -ENOMEM;
 209
 210        core->pdata = pdata;
 211        core->client = client;
 212        mutex_init(&core->lock);
 213
 214        i2c_set_clientdata(client, core);
 215
 216        dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
 217
 218        cell = &core->cells[children];
 219        cell->name = "wl1273_fm_radio";
 220        cell->platform_data = &core;
 221        cell->pdata_size = sizeof(core);
 222        children++;
 223
 224        core->read = wl1273_fm_read_reg;
 225        core->write = wl1273_fm_write_cmd;
 226        core->write_data = wl1273_fm_write_data;
 227        core->set_audio = wl1273_fm_set_audio;
 228        core->set_volume = wl1273_fm_set_volume;
 229
 230        if (pdata->children & WL1273_CODEC_CHILD) {
 231                cell = &core->cells[children];
 232
 233                dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
 234                cell->name = "wl1273-codec";
 235                cell->platform_data = &core;
 236                cell->pdata_size = sizeof(core);
 237                children++;
 238        }
 239
 240        dev_dbg(&client->dev, "%s: number of children: %d.\n",
 241                __func__, children);
 242
 243        r = mfd_add_devices(&client->dev, -1, core->cells,
 244                            children, NULL, 0, NULL);
 245        if (r)
 246                goto err;
 247
 248        return 0;
 249
 250err:
 251        pdata->free_resources();
 252        kfree(core);
 253
 254        dev_dbg(&client->dev, "%s\n", __func__);
 255
 256        return r;
 257}
 258
 259static struct i2c_driver wl1273_core_driver = {
 260        .driver = {
 261                .name = WL1273_FM_DRIVER_NAME,
 262        },
 263        .probe = wl1273_core_probe,
 264        .id_table = wl1273_driver_id_table,
 265        .remove = __devexit_p(wl1273_core_remove),
 266};
 267
 268static int __init wl1273_core_init(void)
 269{
 270        int r;
 271
 272        r = i2c_add_driver(&wl1273_core_driver);
 273        if (r) {
 274                pr_err(WL1273_FM_DRIVER_NAME
 275                       ": driver registration failed\n");
 276                return r;
 277        }
 278
 279        return r;
 280}
 281
 282static void __exit wl1273_core_exit(void)
 283{
 284        i2c_del_driver(&wl1273_core_driver);
 285}
 286late_initcall(wl1273_core_init);
 287module_exit(wl1273_core_exit);
 288
 289MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
 290MODULE_DESCRIPTION(DRIVER_DESC);
 291MODULE_LICENSE("GPL");
 292
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