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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | // SPDX-License-Identifier: GPL-2.0-or-later /* 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 information download the specifications directly from SGS Thomson at http://www.st.com */ #include <linux/module.h> #include <linux/ioctl.h> #include <linux/slab.h> #include <linux/i2c.h> #include <media/v4l2-device.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 const struct v4l2_subdev_video_ops tea6415c_video_ops = { .s_routing = tea6415c_s_routing, }; static const struct v4l2_subdev_ops tea6415c_ops = { .video = &tea6415c_video_ops, }; static int tea6415c_probe(struct i2c_client *client) { 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 -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, &tea6415c_ops); return 0; } static void tea6415c_remove(struct i2c_client *client) { struct v4l2_subdev *sd = i2c_get_clientdata(client); v4l2_device_unregister_subdev(sd); } static const struct i2c_device_id tea6415c_id[] = { { "tea6415c", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, tea6415c_id); static struct i2c_driver tea6415c_driver = { .driver = { .name = "tea6415c", }, .probe = tea6415c_probe, .remove = tea6415c_remove, .id_table = tea6415c_id, }; module_i2c_driver(tea6415c_driver); |