--- /dev/null
+/*
+ * MFD driver for wl1273 FM radio and audio codec submodules.
+ *
+ * Copyright (C) 2011 Nokia Corporation
+ * Author: Matti Aaltonen <matti.j.aaltonen@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/mfd/wl1273-core.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#define DRIVER_DESC "WL1273 FM Radio Core"
+
+static const struct i2c_device_id wl1273_driver_id_table[] = {
+ { WL1273_FM_DRIVER_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
+
+static int wl1273_fm_read_reg(struct wl1273_core *core, u8 reg, u16 *value)
+{
+ struct i2c_client *client = core->client;
+ u8 b[2];
+ int r;
+
+ r = i2c_smbus_read_i2c_block_data(client, reg, sizeof(b), b);
+ if (r != 2) {
+ dev_err(&client->dev, "%s: Read: %d fails.\n", __func__, reg);
+ return -EREMOTEIO;
+ }
+
+ *value = (u16)b[0] << 8 | b[1];
+
+ return 0;
+}
+
+static int wl1273_fm_write_cmd(struct wl1273_core *core, u8 cmd, u16 param)
+{
+ struct i2c_client *client = core->client;
+ u8 buf[] = { (param >> 8) & 0xff, param & 0xff };
+ int r;
+
+ r = i2c_smbus_write_i2c_block_data(client, cmd, sizeof(buf), buf);
+ if (r) {
+ dev_err(&client->dev, "%s: Cmd: %d fails.\n", __func__, cmd);
+ return r;
+ }
+
+ return 0;
+}
+
+static int wl1273_fm_write_data(struct wl1273_core *core, u8 *data, u16 len)
+{
+ struct i2c_client *client = core->client;
+ struct i2c_msg msg;
+ int r;
+
+ msg.addr = client->addr;
+ msg.flags = 0;
+ msg.buf = data;
+ msg.len = len;
+
+ r = i2c_transfer(client->adapter, &msg, 1);
+ if (r != 1) {
+ dev_err(&client->dev, "%s: write error.\n", __func__);
+ return -EREMOTEIO;
+ }
+
+ return 0;
+}
+
+/**
+ * wl1273_fm_set_audio() - Set audio mode.
+ * @core: A pointer to the device struct.
+ * @new_mode: The new audio mode.
+ *
+ * Audio modes are WL1273_AUDIO_DIGITAL and WL1273_AUDIO_ANALOG.
+ */
+static int wl1273_fm_set_audio(struct wl1273_core *core, unsigned int new_mode)
+{
+ int r = 0;
+
+ if (core->mode == WL1273_MODE_OFF ||
+ core->mode == WL1273_MODE_SUSPENDED)
+ return -EPERM;
+
+ if (core->mode == WL1273_MODE_RX && new_mode == WL1273_AUDIO_DIGITAL) {
+ r = wl1273_fm_write_cmd(core, WL1273_PCM_MODE_SET,
+ WL1273_PCM_DEF_MODE);
+ if (r)
+ goto out;
+
+ r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
+ core->i2s_mode);
+ if (r)
+ goto out;
+
+ r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
+ WL1273_AUDIO_ENABLE_I2S);
+ if (r)
+ goto out;
+
+ } else if (core->mode == WL1273_MODE_RX &&
+ new_mode == WL1273_AUDIO_ANALOG) {
+ r = wl1273_fm_write_cmd(core, WL1273_AUDIO_ENABLE,
+ WL1273_AUDIO_ENABLE_ANALOG);
+ if (r)
+ goto out;
+
+ } else if (core->mode == WL1273_MODE_TX &&
+ new_mode == WL1273_AUDIO_DIGITAL) {
+ r = wl1273_fm_write_cmd(core, WL1273_I2S_MODE_CONFIG_SET,
+ core->i2s_mode);
+ if (r)
+ goto out;
+
+ r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
+ WL1273_AUDIO_IO_SET_I2S);
+ if (r)
+ goto out;
+
+ } else if (core->mode == WL1273_MODE_TX &&
+ new_mode == WL1273_AUDIO_ANALOG) {
+ r = wl1273_fm_write_cmd(core, WL1273_AUDIO_IO_SET,
+ WL1273_AUDIO_IO_SET_ANALOG);
+ if (r)
+ goto out;
+ }
+
+ core->audio_mode = new_mode;
+out:
+ return r;
+}
+
+/**
+ * wl1273_fm_set_volume() - Set volume.
+ * @core: A pointer to the device struct.
+ * @volume: The new volume value.
+ */
+static int wl1273_fm_set_volume(struct wl1273_core *core, unsigned int volume)
+{
+ int r;
+
+ if (volume > WL1273_MAX_VOLUME)
+ return -EINVAL;
+
+ if (core->volume == volume)
+ return 0;
+
+ r = wl1273_fm_write_cmd(core, WL1273_VOLUME_SET, volume);
+ if (r)
+ return r;
+
+ core->volume = volume;
+ return 0;
+}
+
+static int wl1273_core_remove(struct i2c_client *client)
+{
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ mfd_remove_devices(&client->dev);
+
+ return 0;
+}
+
+static int wl1273_core_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct wl1273_fm_platform_data *pdata = dev_get_platdata(&client->dev);
+ struct wl1273_core *core;
+ struct mfd_cell *cell;
+ int children = 0;
+ int r = 0;
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ if (!pdata) {
+ dev_err(&client->dev, "No platform data.\n");
+ return -EINVAL;
+ }
+
+ if (!(pdata->children & WL1273_RADIO_CHILD)) {
+ dev_err(&client->dev, "Cannot function without radio child.\n");
+ return -EINVAL;
+ }
+
+ core = devm_kzalloc(&client->dev, sizeof(*core), GFP_KERNEL);
+ if (!core)
+ return -ENOMEM;
+
+ core->pdata = pdata;
+ core->client = client;
+ mutex_init(&core->lock);
+
+ i2c_set_clientdata(client, core);
+
+ dev_dbg(&client->dev, "%s: Have V4L2.\n", __func__);
+
+ cell = &core->cells[children];
+ cell->name = "wl1273_fm_radio";
+ cell->platform_data = &core;
+ cell->pdata_size = sizeof(core);
+ children++;
+
+ core->read = wl1273_fm_read_reg;
+ core->write = wl1273_fm_write_cmd;
+ core->write_data = wl1273_fm_write_data;
+ core->set_audio = wl1273_fm_set_audio;
+ core->set_volume = wl1273_fm_set_volume;
+
+ if (pdata->children & WL1273_CODEC_CHILD) {
+ cell = &core->cells[children];
+
+ dev_dbg(&client->dev, "%s: Have codec.\n", __func__);
+ cell->name = "wl1273-codec";
+ cell->platform_data = &core;
+ cell->pdata_size = sizeof(core);
+ children++;
+ }
+
+ dev_dbg(&client->dev, "%s: number of children: %d.\n",
+ __func__, children);
+
+ r = mfd_add_devices(&client->dev, -1, core->cells,
+ children, NULL, 0, NULL);
+ if (r)
+ goto err;
+
+ return 0;
+
+err:
+ pdata->free_resources();
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ return r;
+}
+
+static struct i2c_driver wl1273_core_driver = {
+ .driver = {
+ .name = WL1273_FM_DRIVER_NAME,
+ },
+ .probe = wl1273_core_probe,
+ .id_table = wl1273_driver_id_table,
+ .remove = wl1273_core_remove,
+};
+
+static int __init wl1273_core_init(void)
+{
+ int r;
+
+ r = i2c_add_driver(&wl1273_core_driver);
+ if (r) {
+ pr_err(WL1273_FM_DRIVER_NAME
+ ": driver registration failed\n");
+ return r;
+ }
+
+ return r;
+}
+
+static void __exit wl1273_core_exit(void)
+{
+ i2c_del_driver(&wl1273_core_driver);
+}
+late_initcall(wl1273_core_init);
+module_exit(wl1273_core_exit);
+
+MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff