--- /dev/null
+ /*
+ tda9840 - i2c-driver for the tda9840 by SGS Thomson
+
+ Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de>
+ Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl>
+
+ The tda9840 is a stereo/dual sound processor with digital
+ identification. It can be found at address 0x84 on the i2c-bus.
+
+ For detailed informations download the specifications directly
+ from SGS Thomson at http://www.st.com
+
+ 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/ioctl.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <media/v4l2-device.h>
+
+MODULE_AUTHOR("Michael Hunold <michael@mihu.de>");
+MODULE_DESCRIPTION("tda9840 driver");
+MODULE_LICENSE("GPL");
+
+static int debug;
+module_param(debug, int, 0644);
+
+MODULE_PARM_DESC(debug, "Debug level (0-1)");
+
+#define SWITCH 0x00
+#define LEVEL_ADJUST 0x02
+#define STEREO_ADJUST 0x03
+#define TEST 0x04
+
+#define TDA9840_SET_MUTE 0x00
+#define TDA9840_SET_MONO 0x10
+#define TDA9840_SET_STEREO 0x2a
+#define TDA9840_SET_LANG1 0x12
+#define TDA9840_SET_LANG2 0x1e
+#define TDA9840_SET_BOTH 0x1a
+#define TDA9840_SET_BOTH_R 0x16
+#define TDA9840_SET_EXTERNAL 0x7a
+
+
+static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+ if (i2c_smbus_write_byte_data(client, reg, val))
+ v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n",
+ val, reg);
+}
+
+static int tda9840_status(struct v4l2_subdev *sd)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ u8 byte;
+
+ if (1 != i2c_master_recv(client, &byte, 1)) {
+ v4l2_dbg(1, debug, sd,
+ "i2c_master_recv() failed\n");
+ return -EIO;
+ }
+
+ if (byte & 0x80) {
+ v4l2_dbg(1, debug, sd,
+ "TDA9840_DETECT: register contents invalid\n");
+ return -EINVAL;
+ }
+
+ v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte);
+ return byte & 0x60;
+}
+
+static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t)
+{
+ int stat = tda9840_status(sd);
+ int byte;
+
+ if (t->index)
+ return -EINVAL;
+
+ stat = stat < 0 ? 0 : stat;
+ if (stat == 0 || stat == 0x60) /* mono input */
+ byte = TDA9840_SET_MONO;
+ else if (stat == 0x40) /* stereo input */
+ byte = (t->audmode == V4L2_TUNER_MODE_MONO) ?
+ TDA9840_SET_MONO : TDA9840_SET_STEREO;
+ else { /* bilingual */
+ switch (t->audmode) {
+ case V4L2_TUNER_MODE_LANG1_LANG2:
+ byte = TDA9840_SET_BOTH;
+ break;
+ case V4L2_TUNER_MODE_LANG2:
+ byte = TDA9840_SET_LANG2;
+ break;
+ default:
+ byte = TDA9840_SET_LANG1;
+ break;
+ }
+ }
+ v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte);
+ tda9840_write(sd, SWITCH, byte);
+ return 0;
+}
+
+static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t)
+{
+ int stat = tda9840_status(sd);
+
+ if (stat < 0)
+ return stat;
+
+ t->rxsubchans = V4L2_TUNER_SUB_MONO;
+
+ switch (stat & 0x60) {
+ case 0x00:
+ t->rxsubchans = V4L2_TUNER_SUB_MONO;
+ break;
+ case 0x20:
+ t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
+ break;
+ case 0x40:
+ t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO;
+ break;
+ default: /* Incorrect detect */
+ t->rxsubchans = V4L2_TUNER_MODE_MONO;
+ break;
+ }
+ return 0;
+}
+
+/* ----------------------------------------------------------------------- */
+
+static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = {
+ .s_tuner = tda9840_s_tuner,
+ .g_tuner = tda9840_g_tuner,
+};
+
+static const struct v4l2_subdev_ops tda9840_ops = {
+ .tuner = &tda9840_tuner_ops,
+};
+
+/* ----------------------------------------------------------------------- */
+
+static int tda9840_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct v4l2_subdev *sd;
+
+ /* let's see whether this adapter can support what we need */
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_BYTE_DATA |
+ I2C_FUNC_SMBUS_WRITE_BYTE_DATA))
+ return -EIO;
+
+ v4l_info(client, "chip found @ 0x%x (%s)\n",
+ client->addr << 1, client->adapter->name);
+
+ sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL);
+ if (sd == NULL)
+ return -ENOMEM;
+ v4l2_i2c_subdev_init(sd, client, &tda9840_ops);
+
+ /* set initial values for level & stereo - adjustment, mode */
+ tda9840_write(sd, LEVEL_ADJUST, 0);
+ tda9840_write(sd, STEREO_ADJUST, 0);
+ tda9840_write(sd, SWITCH, TDA9840_SET_STEREO);
+ return 0;
+}
+
+static int tda9840_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+ v4l2_device_unregister_subdev(sd);
+ return 0;
+}
+
+static const struct i2c_device_id tda9840_id[] = {
+ { "tda9840", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tda9840_id);
+
+static struct i2c_driver tda9840_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "tda9840",
+ },
+ .probe = tda9840_probe,
+ .remove = tda9840_remove,
+ .id_table = tda9840_id,
+};
+
+module_i2c_driver(tda9840_driver);
Code Review / kvmfornfv.git / blobdiff