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
hdpvr_register_ir_i2c(struct hdpvr_device * dev)31 struct 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
hdpvr_i2c_read(struct hdpvr_device * dev,int bus,unsigned char addr,char * wdata,int wlen,char * data,int len)50 static 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
hdpvr_i2c_write(struct hdpvr_device * dev,int bus,unsigned char addr,char * data,int len)82 static 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
hdpvr_transfer(struct i2c_adapter * i2c_adapter,struct i2c_msg * msgs,int num)110 static 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
152 out:
153 mutex_unlock(&dev->i2c_mutex);
154
155 return retval ? retval : num;
156 }
157
hdpvr_functionality(struct i2c_adapter * adapter)158 static u32 hdpvr_functionality(struct i2c_adapter *adapter)
159 {
160 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
161 }
162
163 static const struct i2c_algorithm hdpvr_algo = {
164 .master_xfer = hdpvr_transfer,
165 .functionality = hdpvr_functionality,
166 };
167
168 static const struct i2c_adapter hdpvr_i2c_adapter_template = {
169 .name = "Hauppauge HD PVR I2C",
170 .owner = THIS_MODULE,
171 .algo = &hdpvr_algo,
172 };
173
hdpvr_activate_ir(struct hdpvr_device * dev)174 static 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
hdpvr_register_i2c_adapter(struct hdpvr_device * dev)194 int 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