u-boot/drivers/misc/usb251xb.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Driver for Microchip USB251xB USB 2.0 Hi-Speed Hub Controller
* Configuration via SMBus.
*
* Copyright (c) 2017 SKIDATA AG
*
* This work is based on the USB3503 driver by Dongjin Kim and
* a not-accepted patch by Fabien Lahoudere, see:
* https://patchwork.kernel.org/patch/9257715/
*/
#include <common.h>
#include <asm/gpio.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <errno.h>
#include <i2c.h>
#include <linux/delay.h>
#include <linux/utf.h>
#include <power/regulator.h>
/* Internal Register Set Addresses & Default Values acc. to DS00001692C */
#define USB251XB_ADDR_VENDOR_ID_LSB 0x00
#define USB251XB_ADDR_VENDOR_ID_MSB 0x01
#define USB251XB_DEF_VENDOR_ID 0x0424
#define USB251XB_ADDR_PRODUCT_ID_LSB 0x02
#define USB251XB_ADDR_PRODUCT_ID_MSB 0x03
#define USB251XB_ADDR_DEVICE_ID_LSB 0x04
#define USB251XB_ADDR_DEVICE_ID_MSB 0x05
#define USB251XB_DEF_DEVICE_ID 0x0BB3
#define USB251XB_ADDR_CONFIG_DATA_1 0x06
#define USB251XB_DEF_CONFIG_DATA_1 0x9B
#define USB251XB_ADDR_CONFIG_DATA_2 0x07
#define USB251XB_DEF_CONFIG_DATA_2 0x20
#define USB251XB_ADDR_CONFIG_DATA_3 0x08
#define USB251XB_DEF_CONFIG_DATA_3 0x02
#define USB251XB_ADDR_NON_REMOVABLE_DEVICES 0x09
#define USB251XB_DEF_NON_REMOVABLE_DEVICES 0x00
#define USB251XB_ADDR_PORT_DISABLE_SELF 0x0A
#define USB251XB_DEF_PORT_DISABLE_SELF 0x00
#define USB251XB_ADDR_PORT_DISABLE_BUS 0x0B
#define USB251XB_DEF_PORT_DISABLE_BUS 0x00
#define USB251XB_ADDR_MAX_POWER_SELF 0x0C
#define USB251XB_DEF_MAX_POWER_SELF 0x01
#define USB251XB_ADDR_MAX_POWER_BUS 0x0D
#define USB251XB_DEF_MAX_POWER_BUS 0x32
#define USB251XB_ADDR_MAX_CURRENT_SELF 0x0E
#define USB251XB_DEF_MAX_CURRENT_SELF 0x01
#define USB251XB_ADDR_MAX_CURRENT_BUS 0x0F
#define USB251XB_DEF_MAX_CURRENT_BUS 0x32
#define USB251XB_ADDR_POWER_ON_TIME 0x10
#define USB251XB_DEF_POWER_ON_TIME 0x32
#define USB251XB_ADDR_LANGUAGE_ID_HIGH 0x11
#define USB251XB_ADDR_LANGUAGE_ID_LOW 0x12
#define USB251XB_DEF_LANGUAGE_ID 0x0000
#define USB251XB_STRING_BUFSIZE 62
#define USB251XB_ADDR_MANUFACTURER_STRING_LEN 0x13
#define USB251XB_ADDR_MANUFACTURER_STRING 0x16
#define USB251XB_DEF_MANUFACTURER_STRING "Microchip"
#define USB251XB_ADDR_PRODUCT_STRING_LEN 0x14
#define USB251XB_ADDR_PRODUCT_STRING 0x54
#define USB251XB_ADDR_SERIAL_STRING_LEN 0x15
#define USB251XB_ADDR_SERIAL_STRING 0x92
#define USB251XB_DEF_SERIAL_STRING ""
#define USB251XB_ADDR_BATTERY_CHARGING_ENABLE 0xD0
#define USB251XB_DEF_BATTERY_CHARGING_ENABLE 0x00
#define USB251XB_ADDR_BOOST_UP 0xF6
#define USB251XB_DEF_BOOST_UP 0x00
#define USB251XB_ADDR_BOOST_57 0xF7
#define USB251XB_DEF_BOOST_57 0x00
#define USB251XB_ADDR_BOOST_14 0xF8
#define USB251XB_DEF_BOOST_14 0x00
#define USB251XB_ADDR_PORT_SWAP 0xFA
#define USB251XB_DEF_PORT_SWAP 0x00
#define USB251XB_ADDR_PORT_MAP_12 0xFB
#define USB251XB_DEF_PORT_MAP_12 0x00
#define USB251XB_ADDR_PORT_MAP_34 0xFC
#define USB251XB_DEF_PORT_MAP_34 0x00 /* USB251{3B/i,4B/i,7/i} only */
#define USB251XB_ADDR_PORT_MAP_56 0xFD
#define USB251XB_DEF_PORT_MAP_56 0x00 /* USB2517/i only */
#define USB251XB_ADDR_PORT_MAP_7 0xFE
#define USB251XB_DEF_PORT_MAP_7 0x00 /* USB2517/i only */
#define USB251XB_ADDR_STATUS_COMMAND 0xFF
#define USB251XB_STATUS_COMMAND_SMBUS_DOWN 0x04
#define USB251XB_STATUS_COMMAND_RESET 0x02
#define USB251XB_STATUS_COMMAND_ATTACH 0x01
#define USB251XB_I2C_REG_SZ 0x100
#define USB251XB_I2C_WRITE_SZ 0x10
#define DRIVER_NAME "usb251xb"
#define DRIVER_DESC "Microchip USB 2.0 Hi-Speed Hub Controller"
struct usb251xb {
struct device *dev;
struct i2c_client *i2c;
struct udevice *vdd;
u8 skip_config;
struct gpio_desc gpio_reset;
u32 vendor_id;
u32 product_id;
u32 device_id;
u8 conf_data1;
u8 conf_data2;
u8 conf_data3;
u8 non_rem_dev;
u8 port_disable_sp;
u8 port_disable_bp;
u8 max_power_sp;
u8 max_power_bp;
u8 max_current_sp;
u8 max_current_bp;
u8 power_on_time;
u32 lang_id;
u8 manufacturer_len;
u8 product_len;
u8 serial_len;
s16 manufacturer[USB251XB_STRING_BUFSIZE];
s16 product[USB251XB_STRING_BUFSIZE];
s16 serial[USB251XB_STRING_BUFSIZE];
u8 bat_charge_en;
u32 boost_up;
u8 boost_57;
u8 boost_14;
u8 port_swap;
u8 port_map12;
u8 port_map34;
u8 port_map56;
u8 port_map7;
u8 status;
};
struct usb251xb_data {
u16 product_id;
u8 port_cnt;
bool led_support;
bool bat_support;
char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
};
static const struct usb251xb_data usb2422_data = {
.product_id = 0x2422,
.port_cnt = 2,
.led_support = false,
.bat_support = true,
.product_str = "USB2422",
};
static const struct usb251xb_data usb2512b_data = {
.product_id = 0x2512,
.port_cnt = 2,
.led_support = false,
.bat_support = true,
.product_str = "USB2512B",
};
static const struct usb251xb_data usb2512bi_data = {
.product_id = 0x2512,
.port_cnt = 2,
.led_support = false,
.bat_support = true,
.product_str = "USB2512Bi",
};
static const struct usb251xb_data usb2513b_data = {
.product_id = 0x2513,
.port_cnt = 3,
.led_support = false,
.bat_support = true,
.product_str = "USB2513B",
};
static const struct usb251xb_data usb2513bi_data = {
.product_id = 0x2513,
.port_cnt = 3,
.led_support = false,
.bat_support = true,
.product_str = "USB2513Bi",
};
static const struct usb251xb_data usb2514b_data = {
.product_id = 0x2514,
.port_cnt = 4,
.led_support = false,
.bat_support = true,
.product_str = "USB2514B",
};
static const struct usb251xb_data usb2514bi_data = {
.product_id = 0x2514,
.port_cnt = 4,
.led_support = false,
.bat_support = true,
.product_str = "USB2514Bi",
};
static const struct usb251xb_data usb2517_data = {
.product_id = 0x2517,
.port_cnt = 7,
.led_support = true,
.bat_support = false,
.product_str = "USB2517",
};
static const struct usb251xb_data usb2517i_data = {
.product_id = 0x2517,
.port_cnt = 7,
.led_support = true,
.bat_support = false,
.product_str = "USB2517i",
};
static void usb251xb_reset(struct usb251xb *hub)
{
dm_gpio_set_value(&hub->gpio_reset, 1);
udelay(10); /* >=1us RESET_N asserted */
dm_gpio_set_value(&hub->gpio_reset, 0);
/* wait for hub recovery/stabilization */
udelay(750); /* >=500us after RESET_N deasserted */
}
static int usb251xb_connect(struct udevice *dev)
{
struct usb251xb *hub = dev_get_priv(dev);
char i2c_wb[USB251XB_I2C_REG_SZ];
int err, i;
memset(i2c_wb, 0, USB251XB_I2C_REG_SZ);
if (hub->skip_config) {
dev_info(dev, "Skip hub configuration, only attach.\n");
i2c_wb[0] = 0x01;
i2c_wb[1] = USB251XB_STATUS_COMMAND_ATTACH;
usb251xb_reset(hub);
err = dm_i2c_write(dev, USB251XB_ADDR_STATUS_COMMAND, i2c_wb, 2);
if (err) {
dev_err(dev, "attaching hub failed: %d\n", err);
return err;
}
return 0;
}
i2c_wb[USB251XB_ADDR_VENDOR_ID_MSB] = (hub->vendor_id >> 8) & 0xFF;
i2c_wb[USB251XB_ADDR_VENDOR_ID_LSB] = hub->vendor_id & 0xFF;
i2c_wb[USB251XB_ADDR_PRODUCT_ID_MSB] = (hub->product_id >> 8) & 0xFF;
i2c_wb[USB251XB_ADDR_PRODUCT_ID_LSB] = hub->product_id & 0xFF;
i2c_wb[USB251XB_ADDR_DEVICE_ID_MSB] = (hub->device_id >> 8) & 0xFF;
i2c_wb[USB251XB_ADDR_DEVICE_ID_LSB] = hub->device_id & 0xFF;
i2c_wb[USB251XB_ADDR_CONFIG_DATA_1] = hub->conf_data1;
i2c_wb[USB251XB_ADDR_CONFIG_DATA_2] = hub->conf_data2;
i2c_wb[USB251XB_ADDR_CONFIG_DATA_3] = hub->conf_data3;
i2c_wb[USB251XB_ADDR_NON_REMOVABLE_DEVICES] = hub->non_rem_dev;
i2c_wb[USB251XB_ADDR_PORT_DISABLE_SELF] = hub->port_disable_sp;
i2c_wb[USB251XB_ADDR_PORT_DISABLE_BUS] = hub->port_disable_bp;
i2c_wb[USB251XB_ADDR_MAX_POWER_SELF] = hub->max_power_sp;
i2c_wb[USB251XB_ADDR_MAX_POWER_BUS] = hub->max_power_bp;
i2c_wb[USB251XB_ADDR_MAX_CURRENT_SELF] = hub->max_current_sp;
i2c_wb[USB251XB_ADDR_MAX_CURRENT_BUS] = hub->max_current_bp;
i2c_wb[USB251XB_ADDR_POWER_ON_TIME] = hub->power_on_time;
i2c_wb[USB251XB_ADDR_LANGUAGE_ID_HIGH] = (hub->lang_id >> 8) & 0xFF;
i2c_wb[USB251XB_ADDR_LANGUAGE_ID_LOW] = hub->lang_id & 0xFF;
i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING_LEN] = hub->manufacturer_len;
i2c_wb[USB251XB_ADDR_PRODUCT_STRING_LEN] = hub->product_len;
i2c_wb[USB251XB_ADDR_SERIAL_STRING_LEN] = hub->serial_len;
memcpy(&i2c_wb[USB251XB_ADDR_MANUFACTURER_STRING], hub->manufacturer,
USB251XB_STRING_BUFSIZE);
memcpy(&i2c_wb[USB251XB_ADDR_SERIAL_STRING], hub->serial,
USB251XB_STRING_BUFSIZE);
memcpy(&i2c_wb[USB251XB_ADDR_PRODUCT_STRING], hub->product,
USB251XB_STRING_BUFSIZE);
i2c_wb[USB251XB_ADDR_BATTERY_CHARGING_ENABLE] = hub->bat_charge_en;
i2c_wb[USB251XB_ADDR_BOOST_UP] = hub->boost_up;
i2c_wb[USB251XB_ADDR_BOOST_57] = hub->boost_57;
i2c_wb[USB251XB_ADDR_BOOST_14] = hub->boost_14;
i2c_wb[USB251XB_ADDR_PORT_SWAP] = hub->port_swap;
i2c_wb[USB251XB_ADDR_PORT_MAP_12] = hub->port_map12;
i2c_wb[USB251XB_ADDR_PORT_MAP_34] = hub->port_map34;
i2c_wb[USB251XB_ADDR_PORT_MAP_56] = hub->port_map56;
i2c_wb[USB251XB_ADDR_PORT_MAP_7] = hub->port_map7;
i2c_wb[USB251XB_ADDR_STATUS_COMMAND] = USB251XB_STATUS_COMMAND_ATTACH;
usb251xb_reset(hub);
/* write registers */
for (i = 0; i < (USB251XB_I2C_REG_SZ / USB251XB_I2C_WRITE_SZ); i++) {
int offset = i * USB251XB_I2C_WRITE_SZ;
char wbuf[USB251XB_I2C_WRITE_SZ + 1];
/* The first data byte transferred tells the hub how many data
* bytes will follow (byte count).
*/
wbuf[0] = USB251XB_I2C_WRITE_SZ;
memcpy(&wbuf[1], &i2c_wb[offset], USB251XB_I2C_WRITE_SZ);
dev_dbg(dev, "writing %d byte block %d to 0x%02X\n",
USB251XB_I2C_WRITE_SZ, i, offset);
err = dm_i2c_write(dev, offset, wbuf, USB251XB_I2C_WRITE_SZ + 1);
if (err)
goto out_err;
}
dev_info(dev, "Hub configuration was successful.\n");
return 0;
out_err:
dev_err(dev, "configuring block %d failed: %d\n", i, err);
return err;
}
static int usb251xb_probe(struct udevice *dev)
{
struct usb251xb *hub = dev_get_priv(dev);
int err;
if (CONFIG_IS_ENABLED(DM_REGULATOR) && hub->vdd) {
err = regulator_set_enable(hub->vdd, true);
if (err)
return err;
}
err = usb251xb_connect(dev);
if (err) {
dev_err(dev, "Failed to connect hub (%d)\n", err);
return err;
}
dev_info(dev, "Hub probed successfully\n");
return 0;
}
static void usb251xb_get_ports_field(struct udevice *dev,
const char *prop_name, u8 port_cnt,
bool ds_only, u8 *fld)
{
u32 i, port;
int ret;
for (i = 0; i < port_cnt; i++) {
ret = dev_read_u32_index(dev, prop_name, i, &port);
if (ret)
continue;
if (port >= ds_only ? 1 : 0 && port <= port_cnt)
*fld |= BIT(port);
else
dev_warn(dev, "port %u doesn't exist\n", port);
}
}
static int usb251xb_of_to_plat(struct udevice *dev)
{
struct usb251xb_data *data =
(struct usb251xb_data *)dev_get_driver_data(dev);
struct usb251xb *hub = dev_get_priv(dev);
char str[USB251XB_STRING_BUFSIZE / 2];
const char *cproperty_char;
u32 property_u32 = 0;
int len, err;
if (dev_read_bool(dev, "skip-config"))
hub->skip_config = 1;
else
hub->skip_config = 0;
err = gpio_request_by_name(dev, "reset-gpios", 0, &hub->gpio_reset,
GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
if (err && err != -ENOENT) {
dev_err(dev, "unable to request GPIO reset pin (%d)\n", err);
return err;
}
if (CONFIG_IS_ENABLED(DM_REGULATOR)) {
err = device_get_supply_regulator(dev, "vdd-supply",
&hub->vdd);
if (err && err != -ENOENT) {
dev_err(dev, "Warning: cannot get power supply\n");
return err;
}
}
hub->vendor_id = dev_read_u16_default(dev, "vendor-id",
USB251XB_DEF_VENDOR_ID);
hub->product_id = dev_read_u16_default(dev, "product-id",
data->product_id);
hub->device_id = dev_read_u16_default(dev, "device-id",
USB251XB_DEF_DEVICE_ID);
hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
if (dev_read_bool(dev, "self-powered")) {
hub->conf_data1 |= BIT(7);
/* Configure Over-Current sens when self-powered */
hub->conf_data1 &= ~BIT(2);
if (dev_read_bool(dev, "ganged-sensing"))
hub->conf_data1 &= ~BIT(1);
else if (dev_read_bool(dev, "individual-sensing"))
hub->conf_data1 |= BIT(1);
} else if (dev_read_bool(dev, "bus-powered")) {
hub->conf_data1 &= ~BIT(7);
/* Disable Over-Current sense when bus-powered */
hub->conf_data1 |= BIT(2);
}
if (dev_read_bool(dev, "disable-hi-speed"))
hub->conf_data1 |= BIT(5);
if (dev_read_bool(dev, "multi-tt"))
hub->conf_data1 |= BIT(4);
else if (dev_read_bool(dev, "single-tt"))
hub->conf_data1 &= ~BIT(4);
if (dev_read_bool(dev, "disable-eop"))
hub->conf_data1 |= BIT(3);
if (dev_read_bool(dev, "individual-port-switching"))
hub->conf_data1 |= BIT(0);
else if (dev_read_bool(dev, "ganged-port-switching"))
hub->conf_data1 &= ~BIT(0);
hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
if (dev_read_bool(dev, "dynamic-power-switching"))
hub->conf_data2 |= BIT(7);
if (!dev_read_u32(dev, "oc-delay-us", &property_u32)) {
if (property_u32 == 100) {
/* 100 us*/
hub->conf_data2 &= ~BIT(5);
hub->conf_data2 &= ~BIT(4);
} else if (property_u32 == 4000) {
/* 4 ms */
hub->conf_data2 &= ~BIT(5);
hub->conf_data2 |= BIT(4);
} else if (property_u32 == 16000) {
/* 16 ms */
hub->conf_data2 |= BIT(5);
hub->conf_data2 |= BIT(4);
} else {
/* 8 ms (DEFAULT) */
hub->conf_data2 |= BIT(5);
hub->conf_data2 &= ~BIT(4);
}
}
if (dev_read_bool(dev, "compound-device"))
hub->conf_data2 |= BIT(3);
hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
if (dev_read_bool(dev, "port-mapping-mode"))
hub->conf_data3 |= BIT(3);
if (data->led_support && dev_read_bool(dev, "led-usb-mode"))
hub->conf_data3 &= ~BIT(1);
if (dev_read_bool(dev, "string-support"))
hub->conf_data3 |= BIT(0);
hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
usb251xb_get_ports_field(dev, "non-removable-ports", data->port_cnt,
true, &hub->non_rem_dev);
hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
usb251xb_get_ports_field(dev, "sp-disabled-ports", data->port_cnt,
true, &hub->port_disable_sp);
hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
usb251xb_get_ports_field(dev, "bp-disabled-ports", data->port_cnt,
true, &hub->port_disable_bp);
hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
if (!dev_read_u32(dev, "sp-max-total-current-microamp", &property_u32))
hub->max_power_sp = min_t(u8, property_u32 / 2000, 50);
hub->max_power_bp = USB251XB_DEF_MAX_POWER_BUS;
if (!dev_read_u32(dev, "bp-max-total-current-microamp", &property_u32))
hub->max_power_bp = min_t(u8, property_u32 / 2000, 255);
hub->max_current_sp = USB251XB_DEF_MAX_CURRENT_SELF;
if (!dev_read_u32(dev, "sp-max-removable-current-microamp",
&property_u32))
hub->max_current_sp = min_t(u8, property_u32 / 2000, 50);
hub->max_current_bp = USB251XB_DEF_MAX_CURRENT_BUS;
if (!dev_read_u32(dev, "bp-max-removable-current-microamp",
&property_u32))
hub->max_current_bp = min_t(u8, property_u32 / 2000, 255);
hub->power_on_time = USB251XB_DEF_POWER_ON_TIME;
if (!dev_read_u32(dev, "power-on-time-ms", &property_u32))
hub->power_on_time = min_t(u8, property_u32 / 2, 255);
hub->lang_id = dev_read_u16_default(dev, "language-id",
USB251XB_DEF_LANGUAGE_ID);
hub->boost_up = dev_read_u8_default(dev, "boost-up",
USB251XB_DEF_BOOST_UP);
cproperty_char = dev_read_string(dev, "manufacturer");
strlcpy(str, cproperty_char ? : USB251XB_DEF_MANUFACTURER_STRING,
sizeof(str));
hub->manufacturer_len = strlen(str) & 0xFF;
memset(hub->manufacturer, 0, USB251XB_STRING_BUFSIZE);
len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
len = utf8_to_utf16le(str, hub->manufacturer, len);
cproperty_char = dev_read_string(dev, "product");
strlcpy(str, cproperty_char ? : data->product_str, sizeof(str));
hub->product_len = strlen(str) & 0xFF;
memset(hub->product, 0, USB251XB_STRING_BUFSIZE);
len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
len = utf8_to_utf16le(str, hub->product, len);
cproperty_char = dev_read_string(dev, "serial");
strlcpy(str, cproperty_char ? : USB251XB_DEF_SERIAL_STRING,
sizeof(str));
hub->serial_len = strlen(str) & 0xFF;
memset(hub->serial, 0, USB251XB_STRING_BUFSIZE);
len = min_t(size_t, USB251XB_STRING_BUFSIZE / 2, strlen(str));
len = utf8_to_utf16le(str, hub->serial, len);
/*
* The datasheet documents the register as 'Port Swap' but in real the
* register controls the USB DP/DM signal swapping for each port.
*/
hub->port_swap = USB251XB_DEF_PORT_SWAP;
usb251xb_get_ports_field(dev, "swap-dx-lanes", data->port_cnt,
false, &hub->port_swap);
/* The following parameters are currently not exposed to devicetree, but
* may be as soon as needed.
*/
hub->bat_charge_en = USB251XB_DEF_BATTERY_CHARGING_ENABLE;
hub->boost_57 = USB251XB_DEF_BOOST_57;
hub->boost_14 = USB251XB_DEF_BOOST_14;
hub->port_map12 = USB251XB_DEF_PORT_MAP_12;
hub->port_map34 = USB251XB_DEF_PORT_MAP_34;
hub->port_map56 = USB251XB_DEF_PORT_MAP_56;
hub->port_map7 = USB251XB_DEF_PORT_MAP_7;
return 0;
}
static const struct udevice_id usb251xb_of_match[] = {
{
.compatible = "microchip,usb2422",
.data = (ulong)&usb2422_data,
}, {
.compatible = "microchip,usb2512b",
.data = (ulong)&usb2512b_data,
}, {
.compatible = "microchip,usb2512bi",
.data = (ulong)&usb2512bi_data,
}, {
.compatible = "microchip,usb2513b",
.data = (ulong)&usb2513b_data,
}, {
.compatible = "microchip,usb2513bi",
.data = (ulong)&usb2513bi_data,
}, {
.compatible = "microchip,usb2514b",
.data = (ulong)&usb2514b_data,
}, {
.compatible = "microchip,usb2514bi",
.data = (ulong)&usb2514bi_data,
}, {
.compatible = "microchip,usb2517",
.data = (ulong)&usb2517_data,
}, {
.compatible = "microchip,usb2517i",
.data = (ulong)&usb2517i_data,
}
};
U_BOOT_DRIVER(usb251xb) = {
.name = "usb251xb",
.id = UCLASS_MISC,
.of_match = usb251xb_of_match,
.of_to_plat = usb251xb_of_to_plat,
.probe = usb251xb_probe,
.priv_auto = sizeof(struct usb251xb),
};