[media] MFD: WL1273 FM Radio: MFD driver for the FM radio
This is the core of the WL1273 FM radio driver, it connects
the two child modules. The two child drivers are
drivers/media/radio/radio-wl1273.c and sound/soc/codecs/wl1273.c.
The radio-wl1273 driver implements the V4L2 interface and communicates
with the device. The ALSA codec offers digital audio, without it only
analog audio is available.
Signed-off-by: Matti J. Aaltonen <matti.j.aaltonen@nokia.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/mfd/wl1273-core.c b/drivers/mfd/wl1273-core.c
new file mode 100644
index 0000000..d2ecc24
--- /dev/null
+++ b/drivers/mfd/wl1273-core.c
@@ -0,0 +1,148 @@
+/*
+ * MFD driver for wl1273 FM radio and audio codec submodules.
+ *
+ * Copyright (C) 2010 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>
+
+#define DRIVER_DESC "WL1273 FM Radio Core"
+
+static struct i2c_device_id wl1273_driver_id_table[] = {
+ { WL1273_FM_DRIVER_NAME, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wl1273_driver_id_table);
+
+static int wl1273_core_remove(struct i2c_client *client)
+{
+ struct wl1273_core *core = i2c_get_clientdata(client);
+
+ dev_dbg(&client->dev, "%s\n", __func__);
+
+ mfd_remove_devices(&client->dev);
+ i2c_set_clientdata(client, NULL);
+ kfree(core);
+
+ return 0;
+}
+
+static int __devinit wl1273_core_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct wl1273_fm_platform_data *pdata = client->dev.platform_data;
+ 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 = kzalloc(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->data_size = sizeof(core);
+ children++;
+
+ 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->data_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);
+ if (r)
+ goto err;
+
+ return 0;
+
+err:
+ i2c_set_clientdata(client, NULL);
+ pdata->free_resources();
+ kfree(core);
+
+ 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 = __devexit_p(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");