Janne Grunau | 9aba42e | 2009-03-18 18:10:04 -0300 | [diff] [blame] | 1 | |
| 2 | /* |
Janne Grunau | e86da6f | 2009-03-19 19:00:35 -0300 | [diff] [blame] | 3 | * Hauppauge HD PVR USB driver |
Janne Grunau | 9aba42e | 2009-03-18 18:10:04 -0300 | [diff] [blame] | 4 | * |
| 5 | * Copyright (C) 2008 Janne Grunau (j@jannau.net) |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License as |
| 9 | * published by the Free Software Foundation, version 2. |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <linux/i2c.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/slab.h> |
Janne Grunau | 9aba42e | 2009-03-18 18:10:04 -0300 | [diff] [blame] | 15 | |
| 16 | #include "hdpvr.h" |
| 17 | |
| 18 | #define CTRL_READ_REQUEST 0xb8 |
| 19 | #define CTRL_WRITE_REQUEST 0x38 |
| 20 | |
| 21 | #define REQTYPE_I2C_READ 0xb1 |
| 22 | #define REQTYPE_I2C_WRITE 0xb0 |
| 23 | #define REQTYPE_I2C_WRITE_STATT 0xd0 |
| 24 | |
| 25 | static int hdpvr_i2c_read(struct hdpvr_device *dev, unsigned char addr, |
| 26 | char *data, int len) |
| 27 | { |
| 28 | int ret; |
| 29 | char *buf = kmalloc(len, GFP_KERNEL); |
| 30 | if (!buf) |
| 31 | return -ENOMEM; |
| 32 | |
| 33 | ret = usb_control_msg(dev->udev, |
| 34 | usb_rcvctrlpipe(dev->udev, 0), |
| 35 | REQTYPE_I2C_READ, CTRL_READ_REQUEST, |
| 36 | 0x100|addr, 0, buf, len, 1000); |
| 37 | |
| 38 | if (ret == len) { |
| 39 | memcpy(data, buf, len); |
| 40 | ret = 0; |
| 41 | } else if (ret >= 0) |
| 42 | ret = -EIO; |
| 43 | |
| 44 | kfree(buf); |
| 45 | |
| 46 | return ret; |
| 47 | } |
| 48 | |
| 49 | static int hdpvr_i2c_write(struct hdpvr_device *dev, unsigned char addr, |
| 50 | char *data, int len) |
| 51 | { |
| 52 | int ret; |
| 53 | char *buf = kmalloc(len, GFP_KERNEL); |
| 54 | if (!buf) |
| 55 | return -ENOMEM; |
| 56 | |
| 57 | memcpy(buf, data, len); |
| 58 | ret = usb_control_msg(dev->udev, |
| 59 | usb_sndctrlpipe(dev->udev, 0), |
| 60 | REQTYPE_I2C_WRITE, CTRL_WRITE_REQUEST, |
| 61 | 0x100|addr, 0, buf, len, 1000); |
| 62 | |
| 63 | if (ret < 0) |
| 64 | goto error; |
| 65 | |
| 66 | ret = usb_control_msg(dev->udev, |
| 67 | usb_rcvctrlpipe(dev->udev, 0), |
| 68 | REQTYPE_I2C_WRITE_STATT, CTRL_READ_REQUEST, |
| 69 | 0, 0, buf, 2, 1000); |
| 70 | |
| 71 | if (ret == 2) |
| 72 | ret = 0; |
| 73 | else if (ret >= 0) |
| 74 | ret = -EIO; |
| 75 | |
| 76 | error: |
| 77 | kfree(buf); |
| 78 | return ret; |
| 79 | } |
| 80 | |
| 81 | static int hdpvr_transfer(struct i2c_adapter *i2c_adapter, struct i2c_msg *msgs, |
| 82 | int num) |
| 83 | { |
| 84 | struct hdpvr_device *dev = i2c_get_adapdata(i2c_adapter); |
| 85 | int retval = 0, i, addr; |
| 86 | |
| 87 | if (num <= 0) |
| 88 | return 0; |
| 89 | |
| 90 | mutex_lock(&dev->i2c_mutex); |
| 91 | |
| 92 | for (i = 0; i < num && !retval; i++) { |
| 93 | addr = msgs[i].addr << 1; |
| 94 | |
| 95 | if (msgs[i].flags & I2C_M_RD) |
| 96 | retval = hdpvr_i2c_read(dev, addr, msgs[i].buf, |
| 97 | msgs[i].len); |
| 98 | else |
| 99 | retval = hdpvr_i2c_write(dev, addr, msgs[i].buf, |
| 100 | msgs[i].len); |
| 101 | } |
| 102 | |
| 103 | mutex_unlock(&dev->i2c_mutex); |
| 104 | |
| 105 | return retval ? retval : num; |
| 106 | } |
| 107 | |
| 108 | static u32 hdpvr_functionality(struct i2c_adapter *adapter) |
| 109 | { |
| 110 | return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; |
| 111 | } |
| 112 | |
| 113 | static struct i2c_algorithm hdpvr_algo = { |
| 114 | .master_xfer = hdpvr_transfer, |
| 115 | .functionality = hdpvr_functionality, |
| 116 | }; |
| 117 | |
| 118 | int hdpvr_register_i2c_adapter(struct hdpvr_device *dev) |
| 119 | { |
| 120 | struct i2c_adapter *i2c_adap; |
| 121 | int retval = -ENOMEM; |
| 122 | |
| 123 | i2c_adap = kzalloc(sizeof(struct i2c_adapter), GFP_KERNEL); |
| 124 | if (i2c_adap == NULL) |
| 125 | goto error; |
| 126 | |
| 127 | strlcpy(i2c_adap->name, "Hauppauge HD PVR I2C", |
| 128 | sizeof(i2c_adap->name)); |
| 129 | i2c_adap->algo = &hdpvr_algo; |
| 130 | i2c_adap->class = I2C_CLASS_TV_ANALOG; |
Janne Grunau | 9aba42e | 2009-03-18 18:10:04 -0300 | [diff] [blame] | 131 | i2c_adap->owner = THIS_MODULE; |
| 132 | i2c_adap->dev.parent = &dev->udev->dev; |
| 133 | |
| 134 | i2c_set_adapdata(i2c_adap, dev); |
| 135 | |
| 136 | retval = i2c_add_adapter(i2c_adap); |
| 137 | |
| 138 | if (!retval) |
| 139 | dev->i2c_adapter = i2c_adap; |
| 140 | else |
| 141 | kfree(i2c_adap); |
| 142 | |
| 143 | error: |
| 144 | return retval; |
| 145 | } |