hid-cp2112.c 36.2 KB
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// SPDX-License-Identifier: GPL-2.0-only
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/*
 * hid-cp2112.c - Silicon Labs HID USB to SMBus master bridge
 * Copyright (c) 2013,2014 Uplogix, Inc.
 * David Barksdale <dbarksdale@uplogix.com>
 */

/*
 * The Silicon Labs CP2112 chip is a USB HID device which provides an
 * SMBus controller for talking to slave devices and 8 GPIO pins. The
 * host communicates with the CP2112 via raw HID reports.
 *
 * Data Sheet:
 *   http://www.silabs.com/Support%20Documents/TechnicalDocs/CP2112.pdf
 * Programming Interface Specification:
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 *   https://www.silabs.com/documents/public/application-notes/an495-cp2112-interface-specification.pdf
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 */

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#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
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#include <linux/gpio/driver.h>
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#include <linux/hid.h>
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#include <linux/hidraw.h>
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#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/nls.h>
#include <linux/usb/ch9.h>
#include "hid-ids.h"

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#define CP2112_REPORT_MAX_LENGTH		64
#define CP2112_GPIO_CONFIG_LENGTH		5
#define CP2112_GPIO_GET_LENGTH			2
#define CP2112_GPIO_SET_LENGTH			3

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enum {
	CP2112_GPIO_CONFIG		= 0x02,
	CP2112_GPIO_GET			= 0x03,
	CP2112_GPIO_SET			= 0x04,
	CP2112_GET_VERSION_INFO		= 0x05,
	CP2112_SMBUS_CONFIG		= 0x06,
	CP2112_DATA_READ_REQUEST	= 0x10,
	CP2112_DATA_WRITE_READ_REQUEST	= 0x11,
	CP2112_DATA_READ_FORCE_SEND	= 0x12,
	CP2112_DATA_READ_RESPONSE	= 0x13,
	CP2112_DATA_WRITE_REQUEST	= 0x14,
	CP2112_TRANSFER_STATUS_REQUEST	= 0x15,
	CP2112_TRANSFER_STATUS_RESPONSE	= 0x16,
	CP2112_CANCEL_TRANSFER		= 0x17,
	CP2112_LOCK_BYTE		= 0x20,
	CP2112_USB_CONFIG		= 0x21,
	CP2112_MANUFACTURER_STRING	= 0x22,
	CP2112_PRODUCT_STRING		= 0x23,
	CP2112_SERIAL_STRING		= 0x24,
};

enum {
	STATUS0_IDLE		= 0x00,
	STATUS0_BUSY		= 0x01,
	STATUS0_COMPLETE	= 0x02,
	STATUS0_ERROR		= 0x03,
};

enum {
	STATUS1_TIMEOUT_NACK		= 0x00,
	STATUS1_TIMEOUT_BUS		= 0x01,
	STATUS1_ARBITRATION_LOST	= 0x02,
	STATUS1_READ_INCOMPLETE		= 0x03,
	STATUS1_WRITE_INCOMPLETE	= 0x04,
	STATUS1_SUCCESS			= 0x05,
};

struct cp2112_smbus_config_report {
	u8 report;		/* CP2112_SMBUS_CONFIG */
	__be32 clock_speed;	/* Hz */
	u8 device_address;	/* Stored in the upper 7 bits */
	u8 auto_send_read;	/* 1 = enabled, 0 = disabled */
	__be16 write_timeout;	/* ms, 0 = no timeout */
	__be16 read_timeout;	/* ms, 0 = no timeout */
	u8 scl_low_timeout;	/* 1 = enabled, 0 = disabled */
	__be16 retry_time;	/* # of retries, 0 = no limit */
} __packed;

struct cp2112_usb_config_report {
	u8 report;	/* CP2112_USB_CONFIG */
	__le16 vid;	/* Vendor ID */
	__le16 pid;	/* Product ID */
	u8 max_power;	/* Power requested in 2mA units */
	u8 power_mode;	/* 0x00 = bus powered
			   0x01 = self powered & regulator off
			   0x02 = self powered & regulator on */
	u8 release_major;
	u8 release_minor;
	u8 mask;	/* What fields to program */
} __packed;

struct cp2112_read_req_report {
	u8 report;	/* CP2112_DATA_READ_REQUEST */
	u8 slave_address;
	__be16 length;
} __packed;

struct cp2112_write_read_req_report {
	u8 report;	/* CP2112_DATA_WRITE_READ_REQUEST */
	u8 slave_address;
	__be16 length;
	u8 target_address_length;
	u8 target_address[16];
} __packed;

struct cp2112_write_req_report {
	u8 report;	/* CP2112_DATA_WRITE_REQUEST */
	u8 slave_address;
	u8 length;
	u8 data[61];
} __packed;

struct cp2112_force_read_report {
	u8 report;	/* CP2112_DATA_READ_FORCE_SEND */
	__be16 length;
} __packed;

struct cp2112_xfer_status_report {
	u8 report;	/* CP2112_TRANSFER_STATUS_RESPONSE */
	u8 status0;	/* STATUS0_* */
	u8 status1;	/* STATUS1_* */
	__be16 retries;
	__be16 length;
} __packed;

struct cp2112_string_report {
	u8 dummy;		/* force .string to be aligned */
	u8 report;		/* CP2112_*_STRING */
	u8 length;		/* length in bytes of everyting after .report */
	u8 type;		/* USB_DT_STRING */
	wchar_t string[30];	/* UTF16_LITTLE_ENDIAN string */
} __packed;

/* Number of times to request transfer status before giving up waiting for a
   transfer to complete. This may need to be changed if SMBUS clock, retries,
   or read/write/scl_low timeout settings are changed. */
static const int XFER_STATUS_RETRIES = 10;

/* Time in ms to wait for a CP2112_DATA_READ_RESPONSE or
   CP2112_TRANSFER_STATUS_RESPONSE. */
static const int RESPONSE_TIMEOUT = 50;

static const struct hid_device_id cp2112_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_CYGNAL, USB_DEVICE_ID_CYGNAL_CP2112) },
	{ }
};
MODULE_DEVICE_TABLE(hid, cp2112_devices);

struct cp2112_device {
	struct i2c_adapter adap;
	struct hid_device *hdev;
	wait_queue_head_t wait;
	u8 read_data[61];
	u8 read_length;
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	u8 hwversion;
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	int xfer_status;
	atomic_t read_avail;
	atomic_t xfer_avail;
	struct gpio_chip gc;
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	u8 *in_out_buffer;
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	struct mutex lock;
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	struct gpio_desc *desc[8];
	bool gpio_poll;
	struct delayed_work gpio_poll_worker;
	unsigned long irq_mask;
	u8 gpio_prev_state;
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};

static int gpio_push_pull = 0xFF;
module_param(gpio_push_pull, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(gpio_push_pull, "GPIO push-pull configuration bitmask");

static int cp2112_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
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	struct cp2112_device *dev = gpiochip_get_data(chip);
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	struct hid_device *hdev = dev->hdev;
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	u8 *buf = dev->in_out_buffer;
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	int ret;

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	mutex_lock(&dev->lock);
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	ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
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				 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
				 HID_REQ_GET_REPORT);
	if (ret != CP2112_GPIO_CONFIG_LENGTH) {
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		hid_err(hdev, "error requesting GPIO config: %d\n", ret);
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		if (ret >= 0)
			ret = -EIO;
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		goto exit;
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	}

	buf[1] &= ~(1 << offset);
	buf[2] = gpio_push_pull;

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	ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
				 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
				 HID_REQ_SET_REPORT);
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	if (ret != CP2112_GPIO_CONFIG_LENGTH) {
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		hid_err(hdev, "error setting GPIO config: %d\n", ret);
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		if (ret >= 0)
			ret = -EIO;
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		goto exit;
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	}

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	ret = 0;

exit:
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	mutex_unlock(&dev->lock);
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	return ret;
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}

static void cp2112_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
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	struct cp2112_device *dev = gpiochip_get_data(chip);
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	struct hid_device *hdev = dev->hdev;
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	u8 *buf = dev->in_out_buffer;
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	int ret;

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	mutex_lock(&dev->lock);
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	buf[0] = CP2112_GPIO_SET;
	buf[1] = value ? 0xff : 0;
	buf[2] = 1 << offset;

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	ret = hid_hw_raw_request(hdev, CP2112_GPIO_SET, buf,
				 CP2112_GPIO_SET_LENGTH, HID_FEATURE_REPORT,
				 HID_REQ_SET_REPORT);
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	if (ret < 0)
		hid_err(hdev, "error setting GPIO values: %d\n", ret);
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	mutex_unlock(&dev->lock);
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}

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static int cp2112_gpio_get_all(struct gpio_chip *chip)
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{
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	struct cp2112_device *dev = gpiochip_get_data(chip);
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	struct hid_device *hdev = dev->hdev;
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	u8 *buf = dev->in_out_buffer;
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	int ret;

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	mutex_lock(&dev->lock);
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	ret = hid_hw_raw_request(hdev, CP2112_GPIO_GET, buf,
				 CP2112_GPIO_GET_LENGTH, HID_FEATURE_REPORT,
				 HID_REQ_GET_REPORT);
	if (ret != CP2112_GPIO_GET_LENGTH) {
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		hid_err(hdev, "error requesting GPIO values: %d\n", ret);
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		ret = ret < 0 ? ret : -EIO;
		goto exit;
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	}

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	ret = buf[1];
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exit:
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	mutex_unlock(&dev->lock);
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	return ret;
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}

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static int cp2112_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
	int ret;

	ret = cp2112_gpio_get_all(chip);
	if (ret < 0)
		return ret;

	return (ret >> offset) & 1;
}

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static int cp2112_gpio_direction_output(struct gpio_chip *chip,
					unsigned offset, int value)
{
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	struct cp2112_device *dev = gpiochip_get_data(chip);
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	struct hid_device *hdev = dev->hdev;
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	u8 *buf = dev->in_out_buffer;
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	int ret;

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	mutex_lock(&dev->lock);
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	ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
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				 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
				 HID_REQ_GET_REPORT);
	if (ret != CP2112_GPIO_CONFIG_LENGTH) {
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		hid_err(hdev, "error requesting GPIO config: %d\n", ret);
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		goto fail;
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	}

	buf[1] |= 1 << offset;
	buf[2] = gpio_push_pull;

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	ret = hid_hw_raw_request(hdev, CP2112_GPIO_CONFIG, buf,
				 CP2112_GPIO_CONFIG_LENGTH, HID_FEATURE_REPORT,
				 HID_REQ_SET_REPORT);
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	if (ret < 0) {
		hid_err(hdev, "error setting GPIO config: %d\n", ret);
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		goto fail;
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	}

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	mutex_unlock(&dev->lock);
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	/*
	 * Set gpio value when output direction is already set,
	 * as specified in AN495, Rev. 0.2, cpt. 4.4
	 */
	cp2112_gpio_set(chip, offset, value);

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	return 0;
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fail:
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	mutex_unlock(&dev->lock);
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	return ret < 0 ? ret : -EIO;
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}

static int cp2112_hid_get(struct hid_device *hdev, unsigned char report_number,
			  u8 *data, size_t count, unsigned char report_type)
{
	u8 *buf;
	int ret;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

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	ret = hid_hw_raw_request(hdev, report_number, buf, count,
				       report_type, HID_REQ_GET_REPORT);
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	memcpy(data, buf, count);
	kfree(buf);
	return ret;
}

static int cp2112_hid_output(struct hid_device *hdev, u8 *data, size_t count,
			     unsigned char report_type)
{
	u8 *buf;
	int ret;

	buf = kmemdup(data, count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

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	if (report_type == HID_OUTPUT_REPORT)
		ret = hid_hw_output_report(hdev, buf, count);
	else
		ret = hid_hw_raw_request(hdev, buf[0], buf, count, report_type,
				HID_REQ_SET_REPORT);

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	kfree(buf);
	return ret;
}

static int cp2112_wait(struct cp2112_device *dev, atomic_t *avail)
{
	int ret = 0;

	/* We have sent either a CP2112_TRANSFER_STATUS_REQUEST or a
	 * CP2112_DATA_READ_FORCE_SEND and we are waiting for the response to
	 * come in cp2112_raw_event or timeout. There will only be one of these
	 * in flight at any one time. The timeout is extremely large and is a
	 * last resort if the CP2112 has died. If we do timeout we don't expect
	 * to receive the response which would cause data races, it's not like
	 * we can do anything about it anyway.
	 */
	ret = wait_event_interruptible_timeout(dev->wait,
		atomic_read(avail), msecs_to_jiffies(RESPONSE_TIMEOUT));
	if (-ERESTARTSYS == ret)
		return ret;
	if (!ret)
		return -ETIMEDOUT;

	atomic_set(avail, 0);
	return 0;
}

static int cp2112_xfer_status(struct cp2112_device *dev)
{
	struct hid_device *hdev = dev->hdev;
	u8 buf[2];
	int ret;

	buf[0] = CP2112_TRANSFER_STATUS_REQUEST;
	buf[1] = 0x01;
	atomic_set(&dev->xfer_avail, 0);

	ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
	if (ret < 0) {
		hid_warn(hdev, "Error requesting status: %d\n", ret);
		return ret;
	}

	ret = cp2112_wait(dev, &dev->xfer_avail);
	if (ret)
		return ret;

	return dev->xfer_status;
}

static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size)
{
	struct hid_device *hdev = dev->hdev;
	struct cp2112_force_read_report report;
	int ret;

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	if (size > sizeof(dev->read_data))
		size = sizeof(dev->read_data);
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	report.report = CP2112_DATA_READ_FORCE_SEND;
	report.length = cpu_to_be16(size);

	atomic_set(&dev->read_avail, 0);

	ret = cp2112_hid_output(hdev, &report.report, sizeof(report),
				HID_OUTPUT_REPORT);
	if (ret < 0) {
		hid_warn(hdev, "Error requesting data: %d\n", ret);
		return ret;
	}

	ret = cp2112_wait(dev, &dev->read_avail);
	if (ret)
		return ret;

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	hid_dbg(hdev, "read %d of %zd bytes requested\n",
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		dev->read_length, size);

	if (size > dev->read_length)
		size = dev->read_length;

	memcpy(data, dev->read_data, size);
	return dev->read_length;
}

static int cp2112_read_req(void *buf, u8 slave_address, u16 length)
{
	struct cp2112_read_req_report *report = buf;

	if (length < 1 || length > 512)
		return -EINVAL;

	report->report = CP2112_DATA_READ_REQUEST;
	report->slave_address = slave_address << 1;
	report->length = cpu_to_be16(length);
	return sizeof(*report);
}

static int cp2112_write_read_req(void *buf, u8 slave_address, u16 length,
				 u8 command, u8 *data, u8 data_length)
{
	struct cp2112_write_read_req_report *report = buf;

	if (length < 1 || length > 512
	    || data_length > sizeof(report->target_address) - 1)
		return -EINVAL;

	report->report = CP2112_DATA_WRITE_READ_REQUEST;
	report->slave_address = slave_address << 1;
	report->length = cpu_to_be16(length);
	report->target_address_length = data_length + 1;
	report->target_address[0] = command;
	memcpy(&report->target_address[1], data, data_length);
	return data_length + 6;
}

static int cp2112_write_req(void *buf, u8 slave_address, u8 command, u8 *data,
			    u8 data_length)
{
	struct cp2112_write_req_report *report = buf;

	if (data_length > sizeof(report->data) - 1)
		return -EINVAL;

	report->report = CP2112_DATA_WRITE_REQUEST;
	report->slave_address = slave_address << 1;
	report->length = data_length + 1;
	report->data[0] = command;
	memcpy(&report->data[1], data, data_length);
	return data_length + 4;
}

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static int cp2112_i2c_write_req(void *buf, u8 slave_address, u8 *data,
				u8 data_length)
{
	struct cp2112_write_req_report *report = buf;

	if (data_length > sizeof(report->data))
		return -EINVAL;

	report->report = CP2112_DATA_WRITE_REQUEST;
	report->slave_address = slave_address << 1;
	report->length = data_length;
	memcpy(report->data, data, data_length);
	return data_length + 3;
}

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static int cp2112_i2c_write_read_req(void *buf, u8 slave_address,
				     u8 *addr, int addr_length,
				     int read_length)
{
	struct cp2112_write_read_req_report *report = buf;

	if (read_length < 1 || read_length > 512 ||
	    addr_length > sizeof(report->target_address))
		return -EINVAL;

	report->report = CP2112_DATA_WRITE_READ_REQUEST;
	report->slave_address = slave_address << 1;
	report->length = cpu_to_be16(read_length);
	report->target_address_length = addr_length;
	memcpy(report->target_address, addr, addr_length);
	return addr_length + 5;
}

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static int cp2112_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
			   int num)
{
	struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
	struct hid_device *hdev = dev->hdev;
	u8 buf[64];
	ssize_t count;
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	ssize_t read_length = 0;
	u8 *read_buf = NULL;
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	unsigned int retries;
	int ret;

	hid_dbg(hdev, "I2C %d messages\n", num);

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	if (num == 1) {
		if (msgs->flags & I2C_M_RD) {
			hid_dbg(hdev, "I2C read %#04x len %d\n",
				msgs->addr, msgs->len);
			read_length = msgs->len;
			read_buf = msgs->buf;
			count = cp2112_read_req(buf, msgs->addr, msgs->len);
		} else {
			hid_dbg(hdev, "I2C write %#04x len %d\n",
				msgs->addr, msgs->len);
			count = cp2112_i2c_write_req(buf, msgs->addr,
						     msgs->buf, msgs->len);
		}
		if (count < 0)
			return count;
	} else if (dev->hwversion > 1 &&  /* no repeated start in rev 1 */
		   num == 2 &&
		   msgs[0].addr == msgs[1].addr &&
		   !(msgs[0].flags & I2C_M_RD) && (msgs[1].flags & I2C_M_RD)) {
		hid_dbg(hdev, "I2C write-read %#04x wlen %d rlen %d\n",
			msgs[0].addr, msgs[0].len, msgs[1].len);
		read_length = msgs[1].len;
		read_buf = msgs[1].buf;
		count = cp2112_i2c_write_read_req(buf, msgs[0].addr,
				msgs[0].buf, msgs[0].len, msgs[1].len);
		if (count < 0)
			return count;
	} else {
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		hid_err(hdev,
			"Multi-message I2C transactions not supported\n");
		return -EOPNOTSUPP;
	}

	ret = hid_hw_power(hdev, PM_HINT_FULLON);
	if (ret < 0) {
		hid_err(hdev, "power management error: %d\n", ret);
		return ret;
	}

	ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
	if (ret < 0) {
		hid_warn(hdev, "Error starting transaction: %d\n", ret);
		goto power_normal;
	}

	for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
		ret = cp2112_xfer_status(dev);
		if (-EBUSY == ret)
			continue;
		if (ret < 0)
			goto power_normal;
		break;
	}

	if (XFER_STATUS_RETRIES <= retries) {
		hid_warn(hdev, "Transfer timed out, cancelling.\n");
		buf[0] = CP2112_CANCEL_TRANSFER;
		buf[1] = 0x01;

		ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
		if (ret < 0)
			hid_warn(hdev, "Error cancelling transaction: %d\n",
				 ret);

		ret = -ETIMEDOUT;
		goto power_normal;
	}

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	for (count = 0; count < read_length;) {
		ret = cp2112_read(dev, read_buf + count, read_length - count);
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		if (ret < 0)
			goto power_normal;
		if (ret == 0) {
			hid_err(hdev, "read returned 0\n");
			ret = -EIO;
			goto power_normal;
		}
		count += ret;
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		if (count > read_length) {
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			/*
			 * The hardware returned too much data.
			 * This is mostly harmless because cp2112_read()
			 * has a limit check so didn't overrun our
			 * buffer.  Nevertheless, we return an error
			 * because something is seriously wrong and
			 * it shouldn't go unnoticed.
			 */
			hid_err(hdev, "long read: %d > %zd\n",
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				ret, read_length - count + ret);
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			ret = -EIO;
			goto power_normal;
		}
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	}

	/* return the number of transferred messages */
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	ret = num;
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power_normal:
	hid_hw_power(hdev, PM_HINT_NORMAL);
	hid_dbg(hdev, "I2C transfer finished: %d\n", ret);
	return ret;
}

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static int cp2112_xfer(struct i2c_adapter *adap, u16 addr,
		       unsigned short flags, char read_write, u8 command,
		       int size, union i2c_smbus_data *data)
{
	struct cp2112_device *dev = (struct cp2112_device *)adap->algo_data;
	struct hid_device *hdev = dev->hdev;
	u8 buf[64];
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	__le16 word;
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	ssize_t count;
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	size_t read_length = 0;
	unsigned int retries;
	int ret;

	hid_dbg(hdev, "%s addr 0x%x flags 0x%x cmd 0x%x size %d\n",
		read_write == I2C_SMBUS_WRITE ? "write" : "read",
		addr, flags, command, size);

	switch (size) {
	case I2C_SMBUS_BYTE:
		read_length = 1;

		if (I2C_SMBUS_READ == read_write)
			count = cp2112_read_req(buf, addr, read_length);
		else
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			count = cp2112_write_req(buf, addr, command, NULL,
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						 0);
		break;
	case I2C_SMBUS_BYTE_DATA:
		read_length = 1;

		if (I2C_SMBUS_READ == read_write)
			count = cp2112_write_read_req(buf, addr, read_length,
						      command, NULL, 0);
		else
			count = cp2112_write_req(buf, addr, command,
						 &data->byte, 1);
		break;
	case I2C_SMBUS_WORD_DATA:
		read_length = 2;
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		word = cpu_to_le16(data->word);
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		if (I2C_SMBUS_READ == read_write)
			count = cp2112_write_read_req(buf, addr, read_length,
						      command, NULL, 0);
		else
			count = cp2112_write_req(buf, addr, command,
						 (u8 *)&word, 2);
		break;
	case I2C_SMBUS_PROC_CALL:
		size = I2C_SMBUS_WORD_DATA;
		read_write = I2C_SMBUS_READ;
		read_length = 2;
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		word = cpu_to_le16(data->word);
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		count = cp2112_write_read_req(buf, addr, read_length, command,
					      (u8 *)&word, 2);
		break;
	case I2C_SMBUS_I2C_BLOCK_DATA:
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		if (read_write == I2C_SMBUS_READ) {
			read_length = data->block[0];
			count = cp2112_write_read_req(buf, addr, read_length,
						      command, NULL, 0);
		} else {
			count = cp2112_write_req(buf, addr, command,
						 data->block + 1,
						 data->block[0]);
		}
		break;
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	case I2C_SMBUS_BLOCK_DATA:
		if (I2C_SMBUS_READ == read_write) {
			count = cp2112_write_read_req(buf, addr,
						      I2C_SMBUS_BLOCK_MAX,
						      command, NULL, 0);
		} else {
			count = cp2112_write_req(buf, addr, command,
						 data->block,
						 data->block[0] + 1);
		}
		break;
	case I2C_SMBUS_BLOCK_PROC_CALL:
		size = I2C_SMBUS_BLOCK_DATA;
		read_write = I2C_SMBUS_READ;

		count = cp2112_write_read_req(buf, addr, I2C_SMBUS_BLOCK_MAX,
					      command, data->block,
					      data->block[0] + 1);
		break;
	default:
		hid_warn(hdev, "Unsupported transaction %d\n", size);
		return -EOPNOTSUPP;
	}

	if (count < 0)
		return count;

	ret = hid_hw_power(hdev, PM_HINT_FULLON);
	if (ret < 0) {
		hid_err(hdev, "power management error: %d\n", ret);
		return ret;
	}

	ret = cp2112_hid_output(hdev, buf, count, HID_OUTPUT_REPORT);
	if (ret < 0) {
		hid_warn(hdev, "Error starting transaction: %d\n", ret);
		goto power_normal;
	}

	for (retries = 0; retries < XFER_STATUS_RETRIES; ++retries) {
		ret = cp2112_xfer_status(dev);
		if (-EBUSY == ret)
			continue;
		if (ret < 0)
			goto power_normal;
		break;
	}

	if (XFER_STATUS_RETRIES <= retries) {
		hid_warn(hdev, "Transfer timed out, cancelling.\n");
		buf[0] = CP2112_CANCEL_TRANSFER;
		buf[1] = 0x01;

		ret = cp2112_hid_output(hdev, buf, 2, HID_OUTPUT_REPORT);
		if (ret < 0)
			hid_warn(hdev, "Error cancelling transaction: %d\n",
				 ret);

		ret = -ETIMEDOUT;
		goto power_normal;
	}

	if (I2C_SMBUS_WRITE == read_write) {
		ret = 0;
		goto power_normal;
	}

	if (I2C_SMBUS_BLOCK_DATA == size)
		read_length = ret;

	ret = cp2112_read(dev, buf, read_length);
	if (ret < 0)
		goto power_normal;
	if (ret != read_length) {
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		hid_warn(hdev, "short read: %d < %zd\n", ret, read_length);
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		ret = -EIO;
		goto power_normal;
	}

	switch (size) {
	case I2C_SMBUS_BYTE:
	case I2C_SMBUS_BYTE_DATA:
		data->byte = buf[0];
		break;
	case I2C_SMBUS_WORD_DATA:
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		data->word = le16_to_cpup((__le16 *)buf);
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		break;
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	case I2C_SMBUS_I2C_BLOCK_DATA:
		memcpy(data->block + 1, buf, read_length);
		break;
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	case I2C_SMBUS_BLOCK_DATA:
		if (read_length > I2C_SMBUS_BLOCK_MAX) {
			ret = -EPROTO;
			goto power_normal;
		}

		memcpy(data->block, buf, read_length);
		break;
	}

	ret = 0;
power_normal:
	hid_hw_power(hdev, PM_HINT_NORMAL);
	hid_dbg(hdev, "transfer finished: %d\n", ret);
	return ret;
}

static u32 cp2112_functionality(struct i2c_adapter *adap)
{
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	return I2C_FUNC_I2C |
		I2C_FUNC_SMBUS_BYTE |
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		I2C_FUNC_SMBUS_BYTE_DATA |
		I2C_FUNC_SMBUS_WORD_DATA |
		I2C_FUNC_SMBUS_BLOCK_DATA |
		I2C_FUNC_SMBUS_I2C_BLOCK |
		I2C_FUNC_SMBUS_PROC_CALL |
		I2C_FUNC_SMBUS_BLOCK_PROC_CALL;
}

static const struct i2c_algorithm smbus_algorithm = {
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	.master_xfer	= cp2112_i2c_xfer,
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	.smbus_xfer	= cp2112_xfer,
	.functionality	= cp2112_functionality,
};

static int cp2112_get_usb_config(struct hid_device *hdev,
				 struct cp2112_usb_config_report *cfg)
{
	int ret;

	ret = cp2112_hid_get(hdev, CP2112_USB_CONFIG, (u8 *)cfg, sizeof(*cfg),
			     HID_FEATURE_REPORT);
	if (ret != sizeof(*cfg)) {
		hid_err(hdev, "error reading usb config: %d\n", ret);
		if (ret < 0)
			return ret;
		return -EIO;
	}

	return 0;
}

static int cp2112_set_usb_config(struct hid_device *hdev,
				 struct cp2112_usb_config_report *cfg)
{
	int ret;

	BUG_ON(cfg->report != CP2112_USB_CONFIG);

	ret = cp2112_hid_output(hdev, (u8 *)cfg, sizeof(*cfg),
				HID_FEATURE_REPORT);
	if (ret != sizeof(*cfg)) {
		hid_err(hdev, "error writing usb config: %d\n", ret);
		if (ret < 0)
			return ret;
		return -EIO;
	}

	return 0;
}

static void chmod_sysfs_attrs(struct hid_device *hdev);

#define CP2112_CONFIG_ATTR(name, store, format, ...) \
static ssize_t name##_store(struct device *kdev, \
			    struct device_attribute *attr, const char *buf, \
			    size_t count) \
{ \
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	struct hid_device *hdev = to_hid_device(kdev); \
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	struct cp2112_usb_config_report cfg; \
	int ret = cp2112_get_usb_config(hdev, &cfg); \
	if (ret) \
		return ret; \
	store; \
	ret = cp2112_set_usb_config(hdev, &cfg); \
	if (ret) \
		return ret; \
	chmod_sysfs_attrs(hdev); \
	return count; \
} \
static ssize_t name##_show(struct device *kdev, \
			   struct device_attribute *attr, char *buf) \
{ \
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	struct hid_device *hdev = to_hid_device(kdev); \
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	struct cp2112_usb_config_report cfg; \
	int ret = cp2112_get_usb_config(hdev, &cfg); \
	if (ret) \
		return ret; \
	return scnprintf(buf, PAGE_SIZE, format, ##__VA_ARGS__); \
} \
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static DEVICE_ATTR_RW(name);
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CP2112_CONFIG_ATTR(vendor_id, ({
	u16 vid;

	if (sscanf(buf, "%hi", &vid) != 1)
		return -EINVAL;

	cfg.vid = cpu_to_le16(vid);
	cfg.mask = 0x01;
}), "0x%04x\n", le16_to_cpu(cfg.vid));

CP2112_CONFIG_ATTR(product_id, ({
	u16 pid;

	if (sscanf(buf, "%hi", &pid) != 1)
		return -EINVAL;

	cfg.pid = cpu_to_le16(pid);
	cfg.mask = 0x02;
}), "0x%04x\n", le16_to_cpu(cfg.pid));

CP2112_CONFIG_ATTR(max_power, ({
	int mA;

	if (sscanf(buf, "%i", &mA) != 1)
		return -EINVAL;

	cfg.max_power = (mA + 1) / 2;
	cfg.mask = 0x04;
}), "%u mA\n", cfg.max_power * 2);

CP2112_CONFIG_ATTR(power_mode, ({
	if (sscanf(buf, "%hhi", &cfg.power_mode) != 1)
		return -EINVAL;

	cfg.mask = 0x08;
}), "%u\n", cfg.power_mode);

CP2112_CONFIG_ATTR(release_version, ({
	if (sscanf(buf, "%hhi.%hhi", &cfg.release_major, &cfg.release_minor)
	    != 2)
		return -EINVAL;

	cfg.mask = 0x10;
}), "%u.%u\n", cfg.release_major, cfg.release_minor);

#undef CP2112_CONFIG_ATTR

struct cp2112_pstring_attribute {
	struct device_attribute attr;
	unsigned char report;
};

static ssize_t pstr_store(struct device *kdev,
			  struct device_attribute *kattr, const char *buf,
			  size_t count)
{
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	struct hid_device *hdev = to_hid_device(kdev);
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	struct cp2112_pstring_attribute *attr =
		container_of(kattr, struct cp2112_pstring_attribute, attr);
	struct cp2112_string_report report;
	int ret;

	memset(&report, 0, sizeof(report));

	ret = utf8s_to_utf16s(buf, count, UTF16_LITTLE_ENDIAN,
			      report.string, ARRAY_SIZE(report.string));
	report.report = attr->report;
	report.length = ret * sizeof(report.string[0]) + 2;
	report.type = USB_DT_STRING;

	ret = cp2112_hid_output(hdev, &report.report, report.length + 1,
				HID_FEATURE_REPORT);
	if (ret != report.length + 1) {
		hid_err(hdev, "error writing %s string: %d\n", kattr->attr.name,
			ret);
		if (ret < 0)
			return ret;
		return -EIO;
	}

	chmod_sysfs_attrs(hdev);
	return count;
}

static ssize_t pstr_show(struct device *kdev,
			 struct device_attribute *kattr, char *buf)
{
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	struct hid_device *hdev = to_hid_device(kdev);
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	struct cp2112_pstring_attribute *attr =
		container_of(kattr, struct cp2112_pstring_attribute, attr);
	struct cp2112_string_report report;
	u8 length;
	int ret;

	ret = cp2112_hid_get(hdev, attr->report, &report.report,
			     sizeof(report) - 1, HID_FEATURE_REPORT);
	if (ret < 3) {
		hid_err(hdev, "error reading %s string: %d\n", kattr->attr.name,
			ret);
		if (ret < 0)
			return ret;
		return -EIO;
	}

	if (report.length < 2) {
		hid_err(hdev, "invalid %s string length: %d\n",
			kattr->attr.name, report.length);
		return -EIO;
	}

	length = report.length > ret - 1 ? ret - 1 : report.length;
	length = (length - 2) / sizeof(report.string[0]);
	ret = utf16s_to_utf8s(report.string, length, UTF16_LITTLE_ENDIAN, buf,
			      PAGE_SIZE - 1);
	buf[ret++] = '\n';
	return ret;
}

#define CP2112_PSTR_ATTR(name, _report) \
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static struct cp2112_pstring_attribute dev_attr_##name = { \
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	.attr = __ATTR(name, (S_IWUSR | S_IRUGO), pstr_show, pstr_store), \
	.report = _report, \
};

CP2112_PSTR_ATTR(manufacturer,	CP2112_MANUFACTURER_STRING);
CP2112_PSTR_ATTR(product,	CP2112_PRODUCT_STRING);
CP2112_PSTR_ATTR(serial,	CP2112_SERIAL_STRING);

#undef CP2112_PSTR_ATTR

static const struct attribute_group cp2112_attr_group = {
	.attrs = (struct attribute *[]){
		&dev_attr_vendor_id.attr,
		&dev_attr_product_id.attr,
		&dev_attr_max_power.attr,
		&dev_attr_power_mode.attr,
		&dev_attr_release_version.attr,
		&dev_attr_manufacturer.attr.attr,
		&dev_attr_product.attr.attr,
		&dev_attr_serial.attr.attr,
		NULL
	}
};

/* Chmoding our sysfs attributes is simply a way to expose which fields in the
 * PROM have already been programmed. We do not depend on this preventing
 * writing to these attributes since the CP2112 will simply ignore writes to
 * already-programmed fields. This is why there is no sense in fixing this
 * racy behaviour.
 */
static void chmod_sysfs_attrs(struct hid_device *hdev)
{
	struct attribute **attr;
	u8 buf[2];
	int ret;

	ret = cp2112_hid_get(hdev, CP2112_LOCK_BYTE, buf, sizeof(buf),
			     HID_FEATURE_REPORT);
	if (ret != sizeof(buf)) {
		hid_err(hdev, "error reading lock byte: %d\n", ret);
		return;
	}

	for (attr = cp2112_attr_group.attrs; *attr; ++attr) {
		umode_t mode = (buf[1] & 1) ? S_IWUSR | S_IRUGO : S_IRUGO;
		ret = sysfs_chmod_file(&hdev->dev.kobj, *attr, mode);
		if (ret < 0)
			hid_err(hdev, "error chmoding sysfs file %s\n",
				(*attr)->name);
		buf[1] >>= 1;
	}
}

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static void cp2112_gpio_irq_ack(struct irq_data *d)
{
}

static void cp2112_gpio_irq_mask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct cp2112_device *dev = gpiochip_get_data(gc);

	__clear_bit(d->hwirq, &dev->irq_mask);
}

static void cp2112_gpio_irq_unmask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct cp2112_device *dev = gpiochip_get_data(gc);

	__set_bit(d->hwirq, &dev->irq_mask);
}

static void cp2112_gpio_poll_callback(struct work_struct *work)
{
	struct cp2112_device *dev = container_of(work, struct cp2112_device,
						 gpio_poll_worker.work);
	struct irq_data *d;
	u8 gpio_mask;
	u8 virqs = (u8)dev->irq_mask;
	u32 irq_type;
	int irq, virq, ret;

	ret = cp2112_gpio_get_all(&dev->gc);
	if (ret == -ENODEV) /* the hardware has been disconnected */
		return;
	if (ret < 0)
		goto exit;

	gpio_mask = ret;

	while (virqs) {
		virq = ffs(virqs) - 1;
		virqs &= ~BIT(virq);

		if (!dev->gc.to_irq)
			break;

		irq = dev->gc.to_irq(&dev->gc, virq);

		d = irq_get_irq_data(irq);
		if (!d)
			continue;

		irq_type = irqd_get_trigger_type(d);

		if (gpio_mask & BIT(virq)) {
			/* Level High */

			if (irq_type & IRQ_TYPE_LEVEL_HIGH)
				handle_nested_irq(irq);

			if ((irq_type & IRQ_TYPE_EDGE_RISING) &&
			    !(dev->gpio_prev_state & BIT(virq)))
				handle_nested_irq(irq);
		} else {
			/* Level Low */

			if (irq_type & IRQ_TYPE_LEVEL_LOW)
				handle_nested_irq(irq);

			if ((irq_type & IRQ_TYPE_EDGE_FALLING) &&
			    (dev->gpio_prev_state & BIT(virq)))
				handle_nested_irq(irq);
		}
	}

	dev->gpio_prev_state = gpio_mask;

exit:
	if (dev->gpio_poll)
		schedule_delayed_work(&dev->gpio_poll_worker, 10);
}


static unsigned int cp2112_gpio_irq_startup(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct cp2112_device *dev = gpiochip_get_data(gc);

	INIT_DELAYED_WORK(&dev->gpio_poll_worker, cp2112_gpio_poll_callback);

	if (!dev->gpio_poll) {
		dev->gpio_poll = true;
		schedule_delayed_work(&dev->gpio_poll_worker, 0);
	}

	cp2112_gpio_irq_unmask(d);
	return 0;
}

static void cp2112_gpio_irq_shutdown(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct cp2112_device *dev = gpiochip_get_data(gc);

	cancel_delayed_work_sync(&dev->gpio_poll_worker);
}

static int cp2112_gpio_irq_type(struct irq_data *d, unsigned int type)
{
	return 0;
}

static struct irq_chip cp2112_gpio_irqchip = {
	.name = "cp2112-gpio",
	.irq_startup = cp2112_gpio_irq_startup,
	.irq_shutdown = cp2112_gpio_irq_shutdown,
	.irq_ack = cp2112_gpio_irq_ack,
	.irq_mask = cp2112_gpio_irq_mask,
	.irq_unmask = cp2112_gpio_irq_unmask,
	.irq_set_type = cp2112_gpio_irq_type,
};

static int __maybe_unused cp2112_allocate_irq(struct cp2112_device *dev,
					      int pin)
{
	int ret;

	if (dev->desc[pin])
		return -EINVAL;

	dev->desc[pin] = gpiochip_request_own_desc(&dev->gc, pin,
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						   "HID/I2C:Event",
						   GPIO_ACTIVE_HIGH,
						   GPIOD_IN);
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	if (IS_ERR(dev->desc[pin])) {
		dev_err(dev->gc.parent, "Failed to request GPIO\n");
		return PTR_ERR(dev->desc[pin]);
	}

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	ret = cp2112_gpio_direction_input(&dev->gc, pin);
	if (ret < 0) {
		dev_err(dev->gc.parent, "Failed to set GPIO to input dir\n");
		goto err_desc;
	}

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	ret = gpiochip_lock_as_irq(&dev->gc, pin);
	if (ret) {
		dev_err(dev->gc.parent, "Failed to lock GPIO as interrupt\n");
		goto err_desc;
	}

	ret = gpiod_to_irq(dev->desc[pin]);
	if (ret < 0) {
		dev_err(dev->gc.parent, "Failed to translate GPIO to IRQ\n");
		goto err_lock;
	}

	return ret;

err_lock:
	gpiochip_unlock_as_irq(&dev->gc, pin);
err_desc:
	gpiochip_free_own_desc(dev->desc[pin]);
	dev->desc[pin] = NULL;
	return ret;
}

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static int cp2112_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
	struct cp2112_device *dev;
	u8 buf[3];
	struct cp2112_smbus_config_report config;
	int ret;

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	dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	dev->in_out_buffer = devm_kzalloc(&hdev->dev, CP2112_REPORT_MAX_LENGTH,
					  GFP_KERNEL);
	if (!dev->in_out_buffer)
		return -ENOMEM;

1249
	mutex_init(&dev->lock);
1250

1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "parse failed\n");
		return ret;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW);
	if (ret) {
		hid_err(hdev, "hw start failed\n");
		return ret;
	}

	ret = hid_hw_open(hdev);
	if (ret) {
		hid_err(hdev, "hw open failed\n");
		goto err_hid_stop;
	}

	ret = hid_hw_power(hdev, PM_HINT_FULLON);
	if (ret < 0) {
		hid_err(hdev, "power management error: %d\n", ret);
		goto err_hid_close;
	}

	ret = cp2112_hid_get(hdev, CP2112_GET_VERSION_INFO, buf, sizeof(buf),
			     HID_FEATURE_REPORT);
	if (ret != sizeof(buf)) {
		hid_err(hdev, "error requesting version\n");
		if (ret >= 0)
			ret = -EIO;
		goto err_power_normal;
	}

	hid_info(hdev, "Part Number: 0x%02X Device Version: 0x%02X\n",
		 buf[1], buf[2]);

	ret = cp2112_hid_get(hdev, CP2112_SMBUS_CONFIG, (u8 *)&config,
			     sizeof(config), HID_FEATURE_REPORT);
	if (ret != sizeof(config)) {
		hid_err(hdev, "error requesting SMBus config\n");
		if (ret >= 0)
			ret = -EIO;
		goto err_power_normal;
	}

	config.retry_time = cpu_to_be16(1);

	ret = cp2112_hid_output(hdev, (u8 *)&config, sizeof(config),
				HID_FEATURE_REPORT);
	if (ret != sizeof(config)) {
		hid_err(hdev, "error setting SMBus config\n");
		if (ret >= 0)
			ret = -EIO;
		goto err_power_normal;
	}

	hid_set_drvdata(hdev, (void *)dev);
	dev->hdev		= hdev;
	dev->adap.owner		= THIS_MODULE;
	dev->adap.class		= I2C_CLASS_HWMON;
	dev->adap.algo		= &smbus_algorithm;
	dev->adap.algo_data	= dev;
	dev->adap.dev.parent	= &hdev->dev;
	snprintf(dev->adap.name, sizeof(dev->adap.name),
1315 1316
		 "CP2112 SMBus Bridge on hidraw%d",
		 ((struct hidraw *)hdev->hidraw)->minor);
1317
	dev->hwversion = buf[2];
1318 1319 1320 1321 1322 1323 1324 1325
	init_waitqueue_head(&dev->wait);

	hid_device_io_start(hdev);
	ret = i2c_add_adapter(&dev->adap);
	hid_device_io_stop(hdev);

	if (ret) {
		hid_err(hdev, "error registering i2c adapter\n");
1326
		goto err_power_normal;
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
	}

	hid_dbg(hdev, "adapter registered\n");

	dev->gc.label			= "cp2112_gpio";
	dev->gc.direction_input		= cp2112_gpio_direction_input;
	dev->gc.direction_output	= cp2112_gpio_direction_output;
	dev->gc.set			= cp2112_gpio_set;
	dev->gc.get			= cp2112_gpio_get;
	dev->gc.base			= -1;
	dev->gc.ngpio			= 8;
	dev->gc.can_sleep		= 1;
1339
	dev->gc.parent			= &hdev->dev;
1340

1341
	ret = gpiochip_add_data(&dev->gc, dev);
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355
	if (ret < 0) {
		hid_err(hdev, "error registering gpio chip\n");
		goto err_free_i2c;
	}

	ret = sysfs_create_group(&hdev->dev.kobj, &cp2112_attr_group);
	if (ret < 0) {
		hid_err(hdev, "error creating sysfs attrs\n");
		goto err_gpiochip_remove;
	}

	chmod_sysfs_attrs(hdev);
	hid_hw_power(hdev, PM_HINT_NORMAL);

1356 1357 1358 1359 1360 1361 1362
	ret = gpiochip_irqchip_add(&dev->gc, &cp2112_gpio_irqchip, 0,
				   handle_simple_irq, IRQ_TYPE_NONE);
	if (ret) {
		dev_err(dev->gc.parent, "failed to add IRQ chip\n");
		goto err_sysfs_remove;
	}

1363 1364
	return ret;

1365 1366
err_sysfs_remove:
	sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
1367
err_gpiochip_remove:
1368
	gpiochip_remove(&dev->gc);
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382
err_free_i2c:
	i2c_del_adapter(&dev->adap);
err_power_normal:
	hid_hw_power(hdev, PM_HINT_NORMAL);
err_hid_close:
	hid_hw_close(hdev);
err_hid_stop:
	hid_hw_stop(hdev);
	return ret;
}

static void cp2112_remove(struct hid_device *hdev)
{
	struct cp2112_device *dev = hid_get_drvdata(hdev);
1383
	int i;
1384 1385 1386

	sysfs_remove_group(&hdev->dev.kobj, &cp2112_attr_group);
	i2c_del_adapter(&dev->adap);
1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398

	if (dev->gpio_poll) {
		dev->gpio_poll = false;
		cancel_delayed_work_sync(&dev->gpio_poll_worker);
	}

	for (i = 0; i < ARRAY_SIZE(dev->desc); i++) {
		gpiochip_unlock_as_irq(&dev->gc, i);
		gpiochip_free_own_desc(dev->desc[i]);
	}

	gpiochip_remove(&dev->gc);
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
	/* i2c_del_adapter has finished removing all i2c devices from our
	 * adapter. Well behaved devices should no longer call our cp2112_xfer
	 * and should have waited for any pending calls to finish. It has also
	 * waited for device_unregister(&adap->dev) to complete. Therefore we
	 * can safely free our struct cp2112_device.
	 */
	hid_hw_close(hdev);
	hid_hw_stop(hdev);
}

static int cp2112_raw_event(struct hid_device *hdev, struct hid_report *report,
			    u8 *data, int size)
{
	struct cp2112_device *dev = hid_get_drvdata(hdev);
	struct cp2112_xfer_status_report *xfer = (void *)data;

	switch (data[0]) {
	case CP2112_TRANSFER_STATUS_RESPONSE:
		hid_dbg(hdev, "xfer status: %02x %02x %04x %04x\n",
			xfer->status0, xfer->status1,
			be16_to_cpu(xfer->retries), be16_to_cpu(xfer->length));

		switch (xfer->status0) {
		case STATUS0_IDLE:
			dev->xfer_status = -EAGAIN;
			break;
		case STATUS0_BUSY:
			dev->xfer_status = -EBUSY;
			break;
		case STATUS0_COMPLETE:
			dev->xfer_status = be16_to_cpu(xfer->length);
			break;
		case STATUS0_ERROR:
			switch (xfer->status1) {
			case STATUS1_TIMEOUT_NACK:
			case STATUS1_TIMEOUT_BUS:
				dev->xfer_status = -ETIMEDOUT;
				break;
			default:
				dev->xfer_status = -EIO;
				break;
			}
			break;
		default:
			dev->xfer_status = -EINVAL;
			break;
		}

		atomic_set(&dev->xfer_avail, 1);
		break;
	case CP2112_DATA_READ_RESPONSE:
		hid_dbg(hdev, "read response: %02x %02x\n", data[1], data[2]);

		dev->read_length = data[2];
		if (dev->read_length > sizeof(dev->read_data))
			dev->read_length = sizeof(dev->read_data);

		memcpy(dev->read_data, &data[3], dev->read_length);
		atomic_set(&dev->read_avail, 1);
		break;
	default:
		hid_err(hdev, "unknown report\n");

		return 0;
	}

	wake_up_interruptible(&dev->wait);
	return 1;
}

static struct hid_driver cp2112_driver = {
	.name		= "cp2112",
	.id_table	= cp2112_devices,
	.probe		= cp2112_probe,
	.remove		= cp2112_remove,
	.raw_event	= cp2112_raw_event,
};

module_hid_driver(cp2112_driver);
MODULE_DESCRIPTION("Silicon Labs HID USB to SMBus master bridge");
MODULE_AUTHOR("David Barksdale <dbarksdale@uplogix.com>");
MODULE_LICENSE("GPL");