diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/busses/i2c-tiny-usb.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/i2c/busses/i2c-tiny-usb.c | 271 |
1 files changed, 0 insertions, 271 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/busses/i2c-tiny-usb.c b/ANDROID_3.4.5/drivers/i2c/busses/i2c-tiny-usb.c deleted file mode 100644 index f07307ff..00000000 --- a/ANDROID_3.4.5/drivers/i2c/busses/i2c-tiny-usb.c +++ /dev/null @@ -1,271 +0,0 @@ -/* - * driver for the i2c-tiny-usb adapter - 1.0 - * http://www.harbaum.org/till/i2c_tiny_usb - * - * Copyright (C) 2006-2007 Till Harbaum (Till@Harbaum.org) - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation, version 2. - * - */ - -#include <linux/kernel.h> -#include <linux/errno.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/types.h> - -/* include interfaces to usb layer */ -#include <linux/usb.h> - -/* include interface to i2c layer */ -#include <linux/i2c.h> - -/* commands via USB, must match command ids in the firmware */ -#define CMD_ECHO 0 -#define CMD_GET_FUNC 1 -#define CMD_SET_DELAY 2 -#define CMD_GET_STATUS 3 - -#define CMD_I2C_IO 4 -#define CMD_I2C_IO_BEGIN (1<<0) -#define CMD_I2C_IO_END (1<<1) - -/* i2c bit delay, default is 10us -> 100kHz max - (in practice, due to additional delays in the i2c bitbanging - code this results in a i2c clock of about 50kHz) */ -static unsigned short delay = 10; -module_param(delay, ushort, 0); -MODULE_PARM_DESC(delay, "bit delay in microseconds " - "(default is 10us for 100kHz max)"); - -static int usb_read(struct i2c_adapter *adapter, int cmd, - int value, int index, void *data, int len); - -static int usb_write(struct i2c_adapter *adapter, int cmd, - int value, int index, void *data, int len); - -/* ----- begin of i2c layer ---------------------------------------------- */ - -#define STATUS_IDLE 0 -#define STATUS_ADDRESS_ACK 1 -#define STATUS_ADDRESS_NAK 2 - -static int usb_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) -{ - unsigned char status; - struct i2c_msg *pmsg; - int i; - - dev_dbg(&adapter->dev, "master xfer %d messages:\n", num); - - for (i = 0 ; i < num ; i++) { - int cmd = CMD_I2C_IO; - - if (i == 0) - cmd |= CMD_I2C_IO_BEGIN; - - if (i == num-1) - cmd |= CMD_I2C_IO_END; - - pmsg = &msgs[i]; - - dev_dbg(&adapter->dev, - " %d: %s (flags %d) %d bytes to 0x%02x\n", - i, pmsg->flags & I2C_M_RD ? "read" : "write", - pmsg->flags, pmsg->len, pmsg->addr); - - /* and directly send the message */ - if (pmsg->flags & I2C_M_RD) { - /* read data */ - if (usb_read(adapter, cmd, - pmsg->flags, pmsg->addr, - pmsg->buf, pmsg->len) != pmsg->len) { - dev_err(&adapter->dev, - "failure reading data\n"); - return -EREMOTEIO; - } - } else { - /* write data */ - if (usb_write(adapter, cmd, - pmsg->flags, pmsg->addr, - pmsg->buf, pmsg->len) != pmsg->len) { - dev_err(&adapter->dev, - "failure writing data\n"); - return -EREMOTEIO; - } - } - - /* read status */ - if (usb_read(adapter, CMD_GET_STATUS, 0, 0, &status, 1) != 1) { - dev_err(&adapter->dev, "failure reading status\n"); - return -EREMOTEIO; - } - - dev_dbg(&adapter->dev, " status = %d\n", status); - if (status == STATUS_ADDRESS_NAK) - return -EREMOTEIO; - } - - return i; -} - -static u32 usb_func(struct i2c_adapter *adapter) -{ - __le32 func; - - /* get functionality from adapter */ - if (usb_read(adapter, CMD_GET_FUNC, 0, 0, &func, sizeof(func)) != - sizeof(func)) { - dev_err(&adapter->dev, "failure reading functionality\n"); - return 0; - } - - return le32_to_cpu(func); -} - -/* This is the actual algorithm we define */ -static const struct i2c_algorithm usb_algorithm = { - .master_xfer = usb_xfer, - .functionality = usb_func, -}; - -/* ----- end of i2c layer ------------------------------------------------ */ - -/* ----- begin of usb layer ---------------------------------------------- */ - -/* - * Initially the usb i2c interface uses a vid/pid pair donated by - * Future Technology Devices International Ltd., later a pair was - * bought from EZPrototypes - */ -static const struct usb_device_id i2c_tiny_usb_table[] = { - { USB_DEVICE(0x0403, 0xc631) }, /* FTDI */ - { USB_DEVICE(0x1c40, 0x0534) }, /* EZPrototypes */ - { } /* Terminating entry */ -}; - -MODULE_DEVICE_TABLE(usb, i2c_tiny_usb_table); - -/* Structure to hold all of our device specific stuff */ -struct i2c_tiny_usb { - struct usb_device *usb_dev; /* the usb device for this device */ - struct usb_interface *interface; /* the interface for this device */ - struct i2c_adapter adapter; /* i2c related things */ -}; - -static int usb_read(struct i2c_adapter *adapter, int cmd, - int value, int index, void *data, int len) -{ - struct i2c_tiny_usb *dev = (struct i2c_tiny_usb *)adapter->algo_data; - - /* do control transfer */ - return usb_control_msg(dev->usb_dev, usb_rcvctrlpipe(dev->usb_dev, 0), - cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE | - USB_DIR_IN, value, index, data, len, 2000); -} - -static int usb_write(struct i2c_adapter *adapter, int cmd, - int value, int index, void *data, int len) -{ - struct i2c_tiny_usb *dev = (struct i2c_tiny_usb *)adapter->algo_data; - - /* do control transfer */ - return usb_control_msg(dev->usb_dev, usb_sndctrlpipe(dev->usb_dev, 0), - cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE, - value, index, data, len, 2000); -} - -static void i2c_tiny_usb_free(struct i2c_tiny_usb *dev) -{ - usb_put_dev(dev->usb_dev); - kfree(dev); -} - -static int i2c_tiny_usb_probe(struct usb_interface *interface, - const struct usb_device_id *id) -{ - struct i2c_tiny_usb *dev; - int retval = -ENOMEM; - u16 version; - - dev_dbg(&interface->dev, "probing usb device\n"); - - /* allocate memory for our device state and initialize it */ - dev = kzalloc(sizeof(*dev), GFP_KERNEL); - if (dev == NULL) { - dev_err(&interface->dev, "Out of memory\n"); - goto error; - } - - dev->usb_dev = usb_get_dev(interface_to_usbdev(interface)); - dev->interface = interface; - - /* save our data pointer in this interface device */ - usb_set_intfdata(interface, dev); - - version = le16_to_cpu(dev->usb_dev->descriptor.bcdDevice); - dev_info(&interface->dev, - "version %x.%02x found at bus %03d address %03d\n", - version >> 8, version & 0xff, - dev->usb_dev->bus->busnum, dev->usb_dev->devnum); - - /* setup i2c adapter description */ - dev->adapter.owner = THIS_MODULE; - dev->adapter.class = I2C_CLASS_HWMON; - dev->adapter.algo = &usb_algorithm; - dev->adapter.algo_data = dev; - snprintf(dev->adapter.name, sizeof(dev->adapter.name), - "i2c-tiny-usb at bus %03d device %03d", - dev->usb_dev->bus->busnum, dev->usb_dev->devnum); - - if (usb_write(&dev->adapter, CMD_SET_DELAY, delay, 0, NULL, 0) != 0) { - dev_err(&dev->adapter.dev, - "failure setting delay to %dus\n", delay); - retval = -EIO; - goto error; - } - - dev->adapter.dev.parent = &dev->interface->dev; - - /* and finally attach to i2c layer */ - i2c_add_adapter(&dev->adapter); - - /* inform user about successful attachment to i2c layer */ - dev_info(&dev->adapter.dev, "connected i2c-tiny-usb device\n"); - - return 0; - - error: - if (dev) - i2c_tiny_usb_free(dev); - - return retval; -} - -static void i2c_tiny_usb_disconnect(struct usb_interface *interface) -{ - struct i2c_tiny_usb *dev = usb_get_intfdata(interface); - - i2c_del_adapter(&dev->adapter); - usb_set_intfdata(interface, NULL); - i2c_tiny_usb_free(dev); - - dev_dbg(&interface->dev, "disconnected\n"); -} - -static struct usb_driver i2c_tiny_usb_driver = { - .name = "i2c-tiny-usb", - .probe = i2c_tiny_usb_probe, - .disconnect = i2c_tiny_usb_disconnect, - .id_table = i2c_tiny_usb_table, -}; - -module_usb_driver(i2c_tiny_usb_driver); - -/* ----- end of usb layer ------------------------------------------------ */ - -MODULE_AUTHOR("Till Harbaum <Till@Harbaum.org>"); -MODULE_DESCRIPTION("i2c-tiny-usb driver v1.0"); -MODULE_LICENSE("GPL"); |