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 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 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 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 } 109 110 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 { 128 /* do write-then-read */ 129 retval = hdpvr_i2c_read(dev, 1, addr, msgs[0].buf, msgs[0].len, 130 msgs[1].buf, msgs[1].len); 131 } 132 133 mutex_unlock(&dev->i2c_mutex); 134 135 return retval ? retval : num; 136 } 137 138 static u32 hdpvr_functionality(struct i2c_adapter *adapter) 139 { 140 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; 141 } 142 143 static const struct i2c_algorithm hdpvr_algo = { 144 .master_xfer = hdpvr_transfer, 145 .functionality = hdpvr_functionality, 146 }; 147 148 /* prevent invalid 0-length usb_control_msg and support only write-then-read */ 149 static const struct i2c_adapter_quirks hdpvr_quirks = { 150 .flags = I2C_AQ_NO_ZERO_LEN_READ | I2C_AQ_COMB_WRITE_THEN_READ, 151 }; 152 153 static const struct i2c_adapter hdpvr_i2c_adapter_template = { 154 .name = "Hauppauge HD PVR I2C", 155 .owner = THIS_MODULE, 156 .algo = &hdpvr_algo, 157 .quirks = &hdpvr_quirks, 158 }; 159 160 static int hdpvr_activate_ir(struct hdpvr_device *dev) 161 { 162 char buffer[2]; 163 164 mutex_lock(&dev->i2c_mutex); 165 166 hdpvr_i2c_read(dev, 0, 0x54, NULL, 0, buffer, 1); 167 168 buffer[0] = 0; 169 buffer[1] = 0x8; 170 hdpvr_i2c_write(dev, 1, 0x54, buffer, 2); 171 172 buffer[1] = 0x18; 173 hdpvr_i2c_write(dev, 1, 0x54, buffer, 2); 174 175 mutex_unlock(&dev->i2c_mutex); 176 177 return 0; 178 } 179 180 int hdpvr_register_i2c_adapter(struct hdpvr_device *dev) 181 { 182 hdpvr_activate_ir(dev); 183 184 dev->i2c_adapter = hdpvr_i2c_adapter_template; 185 dev->i2c_adapter.dev.parent = &dev->udev->dev; 186 187 i2c_set_adapdata(&dev->i2c_adapter, dev); 188 189 return i2c_add_adapter(&dev->i2c_adapter); 190 } 191 192 #endif 193