[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>

3 files changed, 159 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3a1493b8b5e5..05ccab6fa919 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -606,6 +606,16 @@ config MFD_VX855
           VIA VX855/VX875 south bridge. You will need to enable the vx855_spi
           and/or vx855_gpio drivers for this to do anything useful.
 
+config MFD_WL1273_CORE
+        tristate
+        depends on I2C
+        select MFD_CORE
+        default n
+        help
+          This is the core driver for the TI WL1273 FM radio. This MFD
+          driver connects the radio-wl1273 V4L2 module and the wl1273
+          audio codec.
+
 endif # MFD_SUPPORT
 
 menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f54b3659abbb..ae2f9153174a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -81,3 +81,4 @@ obj-$(CONFIG_MFD_JANZ_CMODIO)	+= janz-cmodio.o
 obj-$(CONFIG_MFD_JZ4740_ADC)    += jz4740-adc.o
 obj-$(CONFIG_MFD_TPS6586X)      += tps6586x.o
 obj-$(CONFIG_MFD_VX855)         += vx855.o
+obj-$(CONFIG_MFD_WL1273_CORE)   += wl1273-core.o
diff --git a/drivers/mfd/wl1273-core.c b/drivers/mfd/wl1273-core.c
new file mode 100644
index 000000000000..d2ecc2435736
--- /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");