V4L/DVB (5929): Add vp27smpx driver

This device is internal to the Panasonic VP27S tuner and is used to set 
the mono/stereo/bilingual setting of the tuner.

It is used by two Japanese cx23416-based cards.

Signed-off-by: Takahiro Adachi <tadachi@tadachi-net.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 211 insertions, 0 deletions

diff --git a/drivers/media/video/vp27smpx.c b/drivers/media/video/vp27smpx.c
new file mode 100644
index 000000000000..9aa526bd2c84
--- /dev/null
+++ b/drivers/media/video/vp27smpx.c
@@ -0,0 +1,211 @@
+/*
+ * vp27smpx - driver version 0.0.1
+ *
+ * Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
+ *
+ * Special thanks to Kazz for the i2c data.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ioctl.h>
+#include <asm/uaccess.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/videodev.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-chip-ident.h>
+
+MODULE_DESCRIPTION("vp27smpx driver");
+MODULE_AUTHOR("Hans Verkuil");
+MODULE_LICENSE("GPL");
+
+static unsigned short normal_i2c[] = { 0xb6 >> 1, I2C_CLIENT_END };
+
+
+I2C_CLIENT_INSMOD;
+
+/* ----------------------------------------------------------------------- */
+
+struct vp27smpx_state {
+	int radio;
+	u32 audmode;
+};
+
+static void vp27smpx_set_audmode(struct i2c_client *client, u32 audmode)
+{
+	struct vp27smpx_state *state = i2c_get_clientdata(client);
+	u8 data[3] = { 0x00, 0x00, 0x04 };
+
+	switch (audmode) {
+		case V4L2_TUNER_MODE_MONO:
+		case V4L2_TUNER_MODE_LANG1:
+			break;
+		case V4L2_TUNER_MODE_STEREO:
+		case V4L2_TUNER_MODE_LANG1_LANG2:
+			data[1] = 0x01;
+			break;
+		case V4L2_TUNER_MODE_LANG2:
+			data[1] = 0x02;
+			break;
+	}
+
+	if (i2c_master_send(client, data, sizeof(data)) != sizeof(data)) {
+		v4l_err(client, "%s: I/O error setting audmode\n", client->name);
+	}
+	else {
+		state->audmode = audmode;
+	}
+}
+
+static int vp27smpx_command(struct i2c_client *client, unsigned int cmd,
+			  void *arg)
+{
+	struct vp27smpx_state *state = i2c_get_clientdata(client);
+	struct v4l2_tuner *vt = arg;
+
+	switch (cmd) {
+	case AUDC_SET_RADIO:
+		state->radio = 1;
+		break;
+
+	case VIDIOC_S_STD:
+		state->radio = 0;
+		break;
+
+	case VIDIOC_S_TUNER:
+		if (!state->radio)
+			vp27smpx_set_audmode(client, vt->audmode);
+		break;
+
+	case VIDIOC_G_TUNER:
+		if (state->radio)
+			break;
+		vt->audmode = state->audmode;
+		vt->capability = V4L2_TUNER_CAP_STEREO |
+			V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
+		vt->rxsubchans = V4L2_TUNER_SUB_MONO;
+		break;
+
+	case VIDIOC_G_CHIP_IDENT:
+		return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_VP27SMPX, 0);
+
+	case VIDIOC_LOG_STATUS:
+		v4l_info(client, "Audio Mode: %u%s\n", state->audmode,
+				state->radio ? " (Radio)" : "");
+		break;
+
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+
+/*
+ * Generic i2c probe
+ * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
+ */
+
+static struct i2c_driver i2c_driver;
+
+static int vp27smpx_attach(struct i2c_adapter *adapter, int address, int kind)
+{
+	struct i2c_client *client;
+	struct vp27smpx_state *state;
+
+	/* Check if the adapter supports the needed features */
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+		return 0;
+
+	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
+	if (client == 0)
+		return -ENOMEM;
+
+	client->addr = address;
+	client->adapter = adapter;
+	client->driver = &i2c_driver;
+	snprintf(client->name, sizeof(client->name) - 1, "vp27smpx");
+
+	v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
+
+	state = kzalloc(sizeof(struct vp27smpx_state), GFP_KERNEL);
+	if (state == NULL) {
+		kfree(client);
+		return -ENOMEM;
+	}
+	state->audmode = V4L2_TUNER_MODE_STEREO;
+	i2c_set_clientdata(client, state);
+
+	/* initialize vp27smpx */
+	vp27smpx_set_audmode(client, state->audmode);
+	i2c_attach_client(client);
+
+	return 0;
+}
+
+static int vp27smpx_probe(struct i2c_adapter *adapter)
+{
+	if (adapter->class & I2C_CLASS_TV_ANALOG)
+		return i2c_probe(adapter, &addr_data, vp27smpx_attach);
+	return 0;
+}
+
+static int vp27smpx_detach(struct i2c_client *client)
+{
+	struct vp27smpx_state *state = i2c_get_clientdata(client);
+	int err;
+
+	err = i2c_detach_client(client);
+	if (err) {
+		return err;
+	}
+	kfree(state);
+	kfree(client);
+
+	return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+/* i2c implementation */
+static struct i2c_driver i2c_driver = {
+	.driver = {
+		.name = "vp27smpx",
+	},
+	.id             = I2C_DRIVERID_VP27SMPX,
+	.attach_adapter = vp27smpx_probe,
+	.detach_client  = vp27smpx_detach,
+	.command        = vp27smpx_command,
+};
+
+
+static int __init vp27smpx_init_module(void)
+{
+	return i2c_add_driver(&i2c_driver);
+}
+
+static void __exit vp27smpx_cleanup_module(void)
+{
+	i2c_del_driver(&i2c_driver);
+}
+
+module_init(vp27smpx_init_module);
+module_exit(vp27smpx_cleanup_module);