1/*
2 * Copyright (c) 2004-2007 Marcus Overhagen <marcus@overhagen.de>
3 *
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify,
8 * merge, publish, distribute, sublicense, and/or sell copies of
9 * the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
17 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25#include "cx23882_i2c.h"
26#include "i2c_core.h"
27
28
29static void
30set_scl(void *cookie, int state)
31{
32	cx23882_device * device = cookie;
33	if (state)
34		device->i2c_reg |= I2C_SCL;
35	else
36		device->i2c_reg &= ~I2C_SCL;
37	reg_write32(REG_I2C_CONTROL, device->i2c_reg);
38	reg_read32(REG_I2C_CONTROL); // PCI bridge flush
39}
40
41
42static void
43set_sda(void *cookie, int state)
44{
45	cx23882_device * device = cookie;
46	if (state)
47		device->i2c_reg |= I2C_SDA;
48	else
49		device->i2c_reg &= ~I2C_SDA;
50	reg_write32(REG_I2C_CONTROL, device->i2c_reg);
51	reg_read32(REG_I2C_CONTROL); // PCI bridge flush
52}
53
54
55static int
56get_scl(void *cookie)
57{
58	cx23882_device * device = cookie;
59	return (reg_read32(REG_I2C_CONTROL) & I2C_SCL) >> 1; // I2C_SCL is 0x02
60}
61
62
63static int
64get_sda(void *cookie)
65{
66	cx23882_device * device = cookie;
67	return reg_read32(REG_I2C_CONTROL) & I2C_SDA; // I2C_SDA is 0x01
68}
69
70
71status_t
72i2c_init(cx23882_device *device)
73{
74	device->i2c_bus = i2c_create_bus(device, 80000, 2000000, set_scl, set_sda, get_scl, get_sda);
75	device->i2c_reg = reg_read32(REG_I2C_CONTROL);
76	device->i2c_reg &= ~I2C_HW_MODE;
77	device->i2c_reg |= I2C_SCL | I2C_SDA;
78	reg_write32(REG_I2C_CONTROL, device->i2c_reg);
79	reg_read32(REG_I2C_CONTROL); // PCI bridge flush
80	return device->i2c_bus ? B_OK : B_ERROR;
81}
82
83
84void
85i2c_terminate(cx23882_device *device)
86{
87	i2c_delete_bus(device->i2c_bus);
88}
89
90
91