1 2 /* 3 * Hauppauge HD PVR USB driver 4 * 5 * Copyright (C) 2008 Janne Grunau (j@jannau.net) 6 * 7 * IR device registration code is 8 * Copyright (C) 2010 Andy Walls <awalls@md.metrocast.net> 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation, version 2. 13 * 14 */ 15 16 #if IS_ENABLED(CONFIG_I2C) 17 18 #include <linux/i2c.h> 19 #include <linux/slab.h> 20 #include <linux/export.h> 21 22 #include "hdpvr.h" 23 24 #define CTRL_READ_REQUEST 0xb8 25 #define CTRL_WRITE_REQUEST 0x38 26 27 #define REQTYPE_I2C_READ 0xb1 28 #define REQTYPE_I2C_WRITE 0xb0 29 #define REQTYPE_I2C_WRITE_STATT 0xd0 30 31 #define Z8F0811_IR_TX_I2C_ADDR 0x70 32 #define Z8F0811_IR_RX_I2C_ADDR 0x71 33 34 35 struct i2c_client *hdpvr_register_ir_i2c(struct hdpvr_device *dev) 36 { 37 struct IR_i2c_init_data *init_data = &dev->ir_i2c_init_data; 38 struct i2c_board_info info = { 39 I2C_BOARD_INFO("ir_z8f0811_hdpvr", Z8F0811_IR_RX_I2C_ADDR), 40 }; 41 42 /* Our default information for ir-kbd-i2c.c to use */ 43 init_data->ir_codes = RC_MAP_HAUPPAUGE; 44 init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR; 45 init_data->type = RC_PROTO_BIT_RC5 | RC_PROTO_BIT_RC6_MCE | 46 RC_PROTO_BIT_RC6_6A_32; 47 init_data->name = "HD-PVR"; 48 init_data->polling_interval = 405; /* ms, duplicated from Windows */ 49 info.platform_data = init_data; 50 51 return i2c_new_device(&dev->i2c_adapter, &info); 52 } 53 54 static int hdpvr_i2c_read(struct hdpvr_device *dev, int bus, 55 unsigned char addr, char *wdata, int wlen, 56 char *data, int len) 57 { 58 int ret; 59 60 if ((len > sizeof(dev->i2c_buf)) || (wlen > sizeof(dev->i2c_buf))) 61 return -EINVAL; 62 63 if (wlen) { 64 memcpy(dev->i2c_buf, wdata, wlen); 65 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 66 REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST, 67 (bus << 8) | addr, 0, dev->i2c_buf, 68 wlen, 1000); 69 if (ret < 0) 70 return ret; 71 } 72 73 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 74 REQTYPE_I2C_READ, CTRL_READ_REQUEST, 75 (bus << 8) | addr, 0, dev->i2c_buf, len, 1000); 76 77 if (ret == len) { 78 memcpy(data, dev->i2c_buf, len); 79 ret = 0; 80 } else if (ret >= 0) 81 ret = -EIO; 82 83 return ret; 84 } 85 86 static int hdpvr_i2c_write(struct hdpvr_device *dev, int bus, 87 unsigned char addr, char *data, int len) 88 { 89 int ret; 90 91 if (len > sizeof(dev->i2c_buf)) 92 return -EINVAL; 93 94 memcpy(dev->i2c_buf, data, len); 95 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 96 REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST, 97 (bus << 8) | addr, 0, dev->i2c_buf, len, 1000); 98 99 if (ret < 0) 100 return ret; 101 102 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 103 REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST, 104 0, 0, dev->i2c_buf, 2, 1000); 105 106 if ((ret == 2) && (dev->i2c_buf[1] == (len - 1))) 107 ret = 0; 108 else if (ret >= 0) 109 ret = -EIO; 110 111 return ret; 112 } 113 114 static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs, 115 int num) 116 { 117 struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter); 118 int retval = 0, addr; 119 120 mutex_lock(&dev->i2c_mutex); 121 122 addr = msgs[0].addr << 1; 123 124 if (num == 1) { 125 if (msgs[0].flags & I2C_M_RD) 126 retval = hdpvr_i2c_read(dev, 1, addr, NULL, 0, 127 msgs[0].buf, msgs[0].len); 128 else 129 retval = hdpvr_i2c_write(dev, 1, addr, msgs[0].buf, 130 msgs[0].len); 131 } else if (num == 2) { 132 if (msgs[0].addr != msgs[1].addr) { 133 v4l2_warn(&dev->v4l2_dev, "refusing 2-phase i2c xfer with conflicting target addresses\n"); 134 retval = -EINVAL; 135 goto out; 136 } 137 138 if ((msgs[0].flags & I2C_M_RD) || !(msgs[1].flags & I2C_M_RD)) { 139 v4l2_warn(&dev->v4l2_dev, "refusing complex xfer with r0=%d, r1=%d\n", 140 msgs[0].flags & I2C_M_RD, 141 msgs[1].flags & I2C_M_RD); 142 retval = -EINVAL; 143 goto out; 144 } 145 146 /* 147 * Write followed by atomic read is the only complex xfer that 148 * we actually support here. 149 */ 150 retval = hdpvr_i2c_read(dev, 1, addr, msgs[0].buf, msgs[0].len, 151 msgs[1].buf, msgs[1].len); 152 } else { 153 v4l2_warn(&dev->v4l2_dev, "refusing %d-phase i2c xfer\n", num); 154 } 155 156 out: 157 mutex_unlock(&dev->i2c_mutex); 158 159 return retval ? retval : num; 160 } 161 162 static u32 hdpvr_functionality(struct i2c_adapter *adapter) 163 { 164 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; 165 } 166 167 static const struct i2c_algorithm hdpvr_algo = { 168 .master_xfer = hdpvr_transfer, 169 .functionality = hdpvr_functionality, 170 }; 171 172 static const struct i2c_adapter hdpvr_i2c_adapter_template = { 173 .name = "Hauppauge HD PVR I2C", 174 .owner = THIS_MODULE, 175 .algo = &hdpvr_algo, 176 }; 177 178 static int hdpvr_activate_ir(struct hdpvr_device *dev) 179 { 180 char buffer[2]; 181 182 mutex_lock(&dev->i2c_mutex); 183 184 hdpvr_i2c_read(dev, 0, 0x54, NULL, 0, buffer, 1); 185 186 buffer[0] = 0; 187 buffer[1] = 0x8; 188 hdpvr_i2c_write(dev, 1, 0x54, buffer, 2); 189 190 buffer[1] = 0x18; 191 hdpvr_i2c_write(dev, 1, 0x54, buffer, 2); 192 193 mutex_unlock(&dev->i2c_mutex); 194 195 return 0; 196 } 197 198 int hdpvr_register_i2c_adapter(struct hdpvr_device *dev) 199 { 200 int retval = -ENOMEM; 201 202 hdpvr_activate_ir(dev); 203 204 dev->i2c_adapter = hdpvr_i2c_adapter_template; 205 dev->i2c_adapter.dev.parent = &dev->udev->dev; 206 207 i2c_set_adapdata(&dev->i2c_adapter, dev); 208 209 retval = i2c_add_adapter(&dev->i2c_adapter); 210 211 return retval; 212 } 213 214 #endif 215