/* tea6415c - i2c-driver for the tea6415c by SGS Thomson Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> The tea6415c is a bus controlled video-matrix-switch with 8 inputs and 6 outputs. It is cascadable, i.e. it can be found at the addresses 0x86 and 0x06 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 vs 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 Mvss Ave, Cambridge, MA 02139, USA. */ #include <linux/module.h> #include <linux/ioctl.h> #include <linux/i2c.h> #include <media/v4l2-device.h> #include <media/v4l2-chip-ident.h> #include <media/v4l2-i2c-drv.h> #include "tea6415c.h" MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); MODULE_DESCRIPTION("tea6415c driver"); MODULE_LICENSE("GPL"); static int debug; module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "Debug level (0-1)"); /* makes a connection between the input-pin 'i' and the output-pin 'o' */ static int tea6415c_s_routing(struct v4l2_subdev *sd, u32 i, u32 o, u32 config) { struct i2c_client *client = v4l2_get_subdevdata(sd); u8 byte = 0; int ret; v4l2_dbg(1, debug, sd, "i=%d, o=%d\n", i, o); /* check if the pins are valid */ if (0 == ((1 == i || 3 == i || 5 == i || 6 == i || 8 == i || 10 == i || 20 == i || 11 == i) && (18 == o || 17 == o || 16 == o || 15 == o || 14 == o || 13 == o))) return -EINVAL; /* to understand this, have a look at the tea6415c-specs (p.5) */ switch (o) { case 18: byte = 0x00; break; case 14: byte = 0x20; break; case 16: byte = 0x10; break; case 17: byte = 0x08; break; case 15: byte = 0x18; break; case 13: byte = 0x28; break; }; switch (i) { case 5: byte |= 0x00; break; case 8: byte |= 0x04; break; case 3: byte |= 0x02; break; case 20: byte |= 0x06; break; case 6: byte |= 0x01; break; case 10: byte |= 0x05; break; case 1: byte |= 0x03; break; case 11: byte |= 0x07; break; }; ret = i2c_smbus_write_byte(client, byte); if (ret) { v4l2_dbg(1, debug, sd, "i2c_smbus_write_byte() failed, ret:%d\n", ret); return -EIO; } return ret; } static int tea6415c_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) { struct i2c_client *client = v4l2_get_subdevdata(sd); return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEA6415C, 0); } /* ----------------------------------------------------------------------- */ static const struct v4l2_subdev_core_ops tea6415c_core_ops = { .g_chip_ident = tea6415c_g_chip_ident, }; static const struct v4l2_subdev_video_ops tea6415c_video_ops = { .s_routing = tea6415c_s_routing, }; static const struct v4l2_subdev_ops tea6415c_ops = { .core = &tea6415c_core_ops, .video = &tea6415c_video_ops, }; /* this function is called by i2c_probe */ static int tea6415c_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_WRITE_BYTE)) return 0; v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name); sd = kmalloc(sizeof(struct v4l2_subdev), GFP_KERNEL); if (sd == NULL) return -ENOMEM; v4l2_i2c_subdev_init(sd, client, &tea6415c_ops); return 0; } static int tea6415c_remove(struct i2c_client *client) { struct v4l2_subdev *sd = i2c_get_clientdata(client); v4l2_device_unregister_subdev(sd); kfree(sd); return 0; } static const struct i2c_device_id tea6415c_id[] = { { "tea6415c", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, tea6415c_id); static struct v4l2_i2c_driver_data v4l2_i2c_data = { .name = "tea6415c", .probe = tea6415c_probe, .remove = tea6415c_remove, .id_table = tea6415c_id, };