1// SPDX-License-Identifier: GPL-2.0-only
2
3/*
4 * Hauppauge HD PVR USB driver
5 *
6 * Copyright (C) 2008      Janne Grunau (j@jannau.net)
7 *
8 * IR device registration code is
9 * Copyright (C) 2010	Andy Walls <awalls@md.metrocast.net>
10 */
11
12#if IS_ENABLED(CONFIG_I2C)
13
14#include <linux/i2c.h>
15#include <linux/slab.h>
16#include <linux/export.h>
17
18#include "hdpvr.h"
19
20#define CTRL_READ_REQUEST	0xb8
21#define CTRL_WRITE_REQUEST	0x38
22
23#define REQTYPE_I2C_READ	0xb1
24#define REQTYPE_I2C_WRITE	0xb0
25#define REQTYPE_I2C_WRITE_STATT	0xd0
26
27#define Z8F0811_IR_TX_I2C_ADDR	0x70
28#define Z8F0811_IR_RX_I2C_ADDR	0x71
29
30
31struct i2c_client *hdpvr_register_ir_i2c(struct hdpvr_device *dev)
32{
33	struct IR_i2c_init_data *init_data = &dev->ir_i2c_init_data;
34	struct i2c_board_info info = {
35		I2C_BOARD_INFO("ir_z8f0811_hdpvr", Z8F0811_IR_RX_I2C_ADDR),
36	};
37
38	/* Our default information for ir-kbd-i2c.c to use */
39	init_data->ir_codes = RC_MAP_HAUPPAUGE;
40	init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR;
41	init_data->type = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_MCE |
42			  RC_PROTO_BIT_RC6_6A_32;
43	init_data->name = "HD-PVR";
44	init_data->polling_interval = 405; /* ms, duplicated from Windows */
45	info.platform_data = init_data;
46
47	return i2c_new_client_device(&dev->i2c_adapter, &info);
48}
49
50static int hdpvr_i2c_read(struct hdpvr_device *dev, int bus,
51			  unsigned char addr, char *wdata, int wlen,
52			  char *data, int len)
53{
54	int ret;
55
56	if ((len > sizeof(dev->i2c_buf)) || (wlen > sizeof(dev->i2c_buf)))
57		return -EINVAL;
58
59	if (wlen) {
60		memcpy(dev->i2c_buf, wdata, wlen);
61		ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
62				      REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
63				      (bus << 8) | addr, 0, dev->i2c_buf,
64				      wlen, 1000);
65		if (ret < 0)
66			return ret;
67	}
68
69	ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
70			      REQTYPE_I2C_READ, CTRL_READ_REQUEST,
71			      (bus << 8) | addr, 0, dev->i2c_buf, len, 1000);
72
73	if (ret == len) {
74		memcpy(data, dev->i2c_buf, len);
75		ret = 0;
76	} else if (ret >= 0)
77		ret = -EIO;
78
79	return ret;
80}
81
82static int hdpvr_i2c_write(struct hdpvr_device *dev, int bus,
83			   unsigned char addr, char *data, int len)
84{
85	int ret;
86
87	if (len > sizeof(dev->i2c_buf))
88		return -EINVAL;
89
90	memcpy(dev->i2c_buf, data, len);
91	ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
92			      REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST,
93			      (bus << 8) | addr, 0, dev->i2c_buf, len, 1000);
94
95	if (ret < 0)
96		return ret;
97
98	ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
99			      REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST,
100			      0, 0, dev->i2c_buf, 2, 1000);
101
102	if ((ret == 2) && (dev->i2c_buf[1] == (len - 1)))
103		ret = 0;
104	else if (ret >= 0)
105		ret = -EIO;
106
107	return ret;
108}
109
110static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs,
111			  int num)
112{
113	struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter);
114	int retval = 0, addr;
115
116	mutex_lock(&dev->i2c_mutex);
117
118	addr = msgs[0].addr << 1;
119
120	if (num == 1) {
121		if (msgs[0].flags & I2C_M_RD)
122			retval = hdpvr_i2c_read(dev, 1, addr, NULL, 0,
123						msgs[0].buf, msgs[0].len);
124		else
125			retval = hdpvr_i2c_write(dev, 1, addr, msgs[0].buf,
126						 msgs[0].len);
127	} else if (num == 2) {
128		if (msgs[0].addr != msgs[1].addr) {
129			v4l2_warn(&dev->v4l2_dev, "refusing 2-phase i2c xfer with conflicting target addresses\n");
130			retval = -EINVAL;
131			goto out;
132		}
133
134		if ((msgs[0].flags & I2C_M_RD) || !(msgs[1].flags & I2C_M_RD)) {
135			v4l2_warn(&dev->v4l2_dev, "refusing complex xfer with r0=%d, r1=%d\n",
136				  msgs[0].flags & I2C_M_RD,
137				  msgs[1].flags & I2C_M_RD);
138			retval = -EINVAL;
139			goto out;
140		}
141
142		/*
143		 * Write followed by atomic read is the only complex xfer that
144		 * we actually support here.
145		 */
146		retval = hdpvr_i2c_read(dev, 1, addr, msgs[0].buf, msgs[0].len,
147					msgs[1].buf, msgs[1].len);
148	} else {
149		v4l2_warn(&dev->v4l2_dev, "refusing %d-phase i2c xfer\n", num);
150	}
151
152out:
153	mutex_unlock(&dev->i2c_mutex);
154
155	return retval ? retval : num;
156}
157
158static u32 hdpvr_functionality(struct i2c_adapter *adapter)
159{
160	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
161}
162
163static const struct i2c_algorithm hdpvr_algo = {
164	.master_xfer   = hdpvr_transfer,
165	.functionality = hdpvr_functionality,
166};
167
168static const struct i2c_adapter hdpvr_i2c_adapter_template = {
169	.name   = "Hauppauge HD PVR I2C",
170	.owner  = THIS_MODULE,
171	.algo   = &hdpvr_algo,
172};
173
174static int hdpvr_activate_ir(struct hdpvr_device *dev)
175{
176	char buffer[2];
177
178	mutex_lock(&dev->i2c_mutex);
179
180	hdpvr_i2c_read(dev, 0, 0x54, NULL, 0, buffer, 1);
181
182	buffer[0] = 0;
183	buffer[1] = 0x8;
184	hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
185
186	buffer[1] = 0x18;
187	hdpvr_i2c_write(dev, 1, 0x54, buffer, 2);
188
189	mutex_unlock(&dev->i2c_mutex);
190
191	return 0;
192}
193
194int hdpvr_register_i2c_adapter(struct hdpvr_device *dev)
195{
196	hdpvr_activate_ir(dev);
197
198	dev->i2c_adapter = hdpvr_i2c_adapter_template;
199	dev->i2c_adapter.dev.parent = &dev->udev->dev;
200
201	i2c_set_adapdata(&dev->i2c_adapter, dev);
202
203	return i2c_add_adapter(&dev->i2c_adapter);
204}
205
206#endif
207