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kernel/drivers/usb/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 <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/nls.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.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 regulator *vdd;
u8 skip_config;
struct gpio_desc *gpio_reset;
u16 vendor_id;
u16 product_id;
u16 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;
u16 lang_id;
u8 manufacturer_len;
u8 product_len;
u8 serial_len;
char manufacturer[USB251XB_STRING_BUFSIZE];
char product[USB251XB_STRING_BUFSIZE];
char serial[USB251XB_STRING_BUFSIZE];
u8 bat_charge_en;
u8 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",
};
#ifdef CONFIG_GPIOLIB
static int usb251xb_check_dev_children(struct device *dev, void *child)
{
if (dev->type == &i2c_adapter_type) {
return device_for_each_child(dev, child,
usb251xb_check_dev_children);
}
return (dev == child);
}
static int usb251x_check_gpio_chip(struct usb251xb *hub)
{
struct gpio_chip *gc = gpiod_to_chip(hub->gpio_reset);
struct i2c_adapter *adap = hub->i2c->adapter;
int ret;
if (!hub->gpio_reset)
return 0;
if (!gc)
return -EINVAL;
ret = usb251xb_check_dev_children(&adap->dev, gc->parent);
if (ret) {
dev_err(hub->dev, "Reset GPIO chip is at the same i2c-bus\n");
return -EINVAL;
}
return 0;
}
#else
static int usb251x_check_gpio_chip(struct usb251xb *hub)
{
return 0;
}
#endif
static void usb251xb_reset(struct usb251xb *hub)
{
if (!hub->gpio_reset)
return;
i2c_lock_bus(hub->i2c->adapter, I2C_LOCK_SEGMENT);
gpiod_set_value_cansleep(hub->gpio_reset, 1);
usleep_range(1, 10); /* >=1us RESET_N asserted */
gpiod_set_value_cansleep(hub->gpio_reset, 0);
/* wait for hub recovery/stabilization */
usleep_range(500, 750); /* >=500us after RESET_N deasserted */
i2c_unlock_bus(hub->i2c->adapter, I2C_LOCK_SEGMENT);
}
static int usb251xb_connect(struct usb251xb *hub)
{
struct device *dev = hub->dev;
int err, i;
char i2c_wb[USB251XB_I2C_REG_SZ];
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 = i2c_smbus_write_i2c_block_data(hub->i2c,
USB251XB_ADDR_STATUS_COMMAND, 2, i2c_wb);
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 = i2c_smbus_write_i2c_block_data(hub->i2c, offset,
USB251XB_I2C_WRITE_SZ + 1,
wbuf);
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;
}
#ifdef CONFIG_OF
static void usb251xb_get_ports_field(struct usb251xb *hub,
const char *prop_name, u8 port_cnt,
bool ds_only, u8 *fld)
{
struct device *dev = hub->dev;
struct property *prop;
const __be32 *p;
u32 port;
of_property_for_each_u32(dev->of_node, prop_name, prop, p, port) {
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_get_ofdata(struct usb251xb *hub,
const struct usb251xb_data *data)
{
struct device *dev = hub->dev;
struct device_node *np = dev->of_node;
int len;
u32 property_u32 = 0;
const char *cproperty_char;
char str[USB251XB_STRING_BUFSIZE / 2];
if (!np) {
dev_err(dev, "failed to get ofdata\n");
return -ENODEV;
}
hub->skip_config = of_property_read_bool(np, "skip-config");
hub->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(hub->gpio_reset))
return dev_err_probe(dev, PTR_ERR(hub->gpio_reset),
"unable to request GPIO reset pin\n");
if (of_property_read_u16_array(np, "vendor-id", &hub->vendor_id, 1))
hub->vendor_id = USB251XB_DEF_VENDOR_ID;
if (of_property_read_u16_array(np, "product-id",
&hub->product_id, 1))
hub->product_id = data->product_id;
if (of_property_read_u16_array(np, "device-id", &hub->device_id, 1))
hub->device_id = USB251XB_DEF_DEVICE_ID;
hub->conf_data1 = USB251XB_DEF_CONFIG_DATA_1;
if (of_property_read_bool(np, "self-powered")) {
hub->conf_data1 |= BIT(7);
/* Configure Over-Current sens when self-powered */
hub->conf_data1 &= ~BIT(2);
if (of_property_read_bool(np, "ganged-sensing"))
hub->conf_data1 &= ~BIT(1);
else if (of_property_read_bool(np, "individual-sensing"))
hub->conf_data1 |= BIT(1);
} else if (of_property_read_bool(np, "bus-powered")) {
hub->conf_data1 &= ~BIT(7);
/* Disable Over-Current sense when bus-powered */
hub->conf_data1 |= BIT(2);
}
if (of_property_read_bool(np, "disable-hi-speed"))
hub->conf_data1 |= BIT(5);
if (of_property_read_bool(np, "multi-tt"))
hub->conf_data1 |= BIT(4);
else if (of_property_read_bool(np, "single-tt"))
hub->conf_data1 &= ~BIT(4);
if (of_property_read_bool(np, "disable-eop"))
hub->conf_data1 |= BIT(3);
if (of_property_read_bool(np, "individual-port-switching"))
hub->conf_data1 |= BIT(0);
else if (of_property_read_bool(np, "ganged-port-switching"))
hub->conf_data1 &= ~BIT(0);
hub->conf_data2 = USB251XB_DEF_CONFIG_DATA_2;
if (of_property_read_bool(np, "dynamic-power-switching"))
hub->conf_data2 |= BIT(7);
if (!of_property_read_u32(np, "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 (of_property_read_bool(np, "compound-device"))
hub->conf_data2 |= BIT(3);
hub->conf_data3 = USB251XB_DEF_CONFIG_DATA_3;
if (of_property_read_bool(np, "port-mapping-mode"))
hub->conf_data3 |= BIT(3);
if (data->led_support && of_get_property(np, "led-usb-mode", NULL))
hub->conf_data3 &= ~BIT(1);
if (of_property_read_bool(np, "string-support"))
hub->conf_data3 |= BIT(0);
hub->non_rem_dev = USB251XB_DEF_NON_REMOVABLE_DEVICES;
usb251xb_get_ports_field(hub, "non-removable-ports", data->port_cnt,
true, &hub->non_rem_dev);
hub->port_disable_sp = USB251XB_DEF_PORT_DISABLE_SELF;
usb251xb_get_ports_field(hub, "sp-disabled-ports", data->port_cnt,
true, &hub->port_disable_sp);
hub->port_disable_bp = USB251XB_DEF_PORT_DISABLE_BUS;
usb251xb_get_ports_field(hub, "bp-disabled-ports", data->port_cnt,
true, &hub->port_disable_bp);
hub->max_power_sp = USB251XB_DEF_MAX_POWER_SELF;
if (!of_property_read_u32(np, "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 (!of_property_read_u32(np, "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 (!of_property_read_u32(np, "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 (!of_property_read_u32(np, "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 (!of_property_read_u32(np, "power-on-time-ms", &property_u32))
hub->power_on_time = min_t(u8, property_u32 / 2, 255);
if (of_property_read_u16_array(np, "language-id", &hub->lang_id, 1))
hub->lang_id = USB251XB_DEF_LANGUAGE_ID;
if (of_property_read_u8(np, "boost-up", &hub->boost_up))
hub->boost_up = USB251XB_DEF_BOOST_UP;
cproperty_char = of_get_property(np, "manufacturer", NULL);
strscpy(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 = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
(wchar_t *)hub->manufacturer,
USB251XB_STRING_BUFSIZE);
cproperty_char = of_get_property(np, "product", NULL);
strscpy(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 = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
(wchar_t *)hub->product,
USB251XB_STRING_BUFSIZE);
cproperty_char = of_get_property(np, "serial", NULL);
strscpy(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 = utf8s_to_utf16s(str, len, UTF16_LITTLE_ENDIAN,
(wchar_t *)hub->serial,
USB251XB_STRING_BUFSIZE);
/*
* 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(hub, "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 of_device_id usb251xb_of_match[] = {
{
.compatible = "microchip,usb2422",
.data = &usb2422_data,
}, {
.compatible = "microchip,usb2512b",
.data = &usb2512b_data,
}, {
.compatible = "microchip,usb2512bi",
.data = &usb2512bi_data,
}, {
.compatible = "microchip,usb2513b",
.data = &usb2513b_data,
}, {
.compatible = "microchip,usb2513bi",
.data = &usb2513bi_data,
}, {
.compatible = "microchip,usb2514b",
.data = &usb2514b_data,
}, {
.compatible = "microchip,usb2514bi",
.data = &usb2514bi_data,
}, {
.compatible = "microchip,usb2517",
.data = &usb2517_data,
}, {
.compatible = "microchip,usb2517i",
.data = &usb2517i_data,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, usb251xb_of_match);
#else /* CONFIG_OF */
static int usb251xb_get_ofdata(struct usb251xb *hub,
const struct usb251xb_data *data)
{
return 0;
}
#endif /* CONFIG_OF */
static void usb251xb_regulator_disable_action(void *data)
{
struct usb251xb *hub = data;
regulator_disable(hub->vdd);
}
static int usb251xb_probe(struct usb251xb *hub)
{
struct device *dev = hub->dev;
struct device_node *np = dev->of_node;
const struct usb251xb_data *usb_data = of_device_get_match_data(dev);
int err;
if (np && usb_data) {
err = usb251xb_get_ofdata(hub, usb_data);
if (err) {
dev_err(dev, "failed to get ofdata: %d\n", err);
return err;
}
}
/*
* usb251x SMBus-slave SCL lane is muxed with CFG_SEL0 pin. So if anyone
* tries to work with the bus at the moment the hub reset is released,
* it may cause an invalid config being latched by usb251x. Particularly
* one of the config modes makes the hub loading a default registers
* value without SMBus-slave interface activation. If the hub
* accidentally gets this mode, this will cause the driver SMBus-
* functions failure. Normally we could just lock the SMBus-segment the
* hub i2c-interface resides for the device-specific reset timing. But
* the GPIO controller, which is used to handle the hub reset, might be
* placed at the same i2c-bus segment. In this case an error should be
* returned since we can't safely use the GPIO controller to clear the
* reset state (it may affect the hub configuration) and we can't lock
* the i2c-bus segment (it will cause a deadlock).
*/
err = usb251x_check_gpio_chip(hub);
if (err)
return err;
hub->vdd = devm_regulator_get(dev, "vdd");
if (IS_ERR(hub->vdd))
return PTR_ERR(hub->vdd);
err = regulator_enable(hub->vdd);
if (err)
return err;
err = devm_add_action_or_reset(dev,
usb251xb_regulator_disable_action, hub);
if (err)
return err;
err = usb251xb_connect(hub);
if (err) {
dev_err(dev, "Failed to connect hub (%d)\n", err);
return err;
}
dev_info(dev, "Hub probed successfully\n");
return 0;
}
static int usb251xb_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct usb251xb *hub;
hub = devm_kzalloc(&i2c->dev, sizeof(struct usb251xb), GFP_KERNEL);
if (!hub)
return -ENOMEM;
i2c_set_clientdata(i2c, hub);
hub->dev = &i2c->dev;
hub->i2c = i2c;
return usb251xb_probe(hub);
}
static int __maybe_unused usb251xb_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct usb251xb *hub = i2c_get_clientdata(client);
return regulator_disable(hub->vdd);
}
static int __maybe_unused usb251xb_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct usb251xb *hub = i2c_get_clientdata(client);
int err;
err = regulator_enable(hub->vdd);
if (err)
return err;
return usb251xb_connect(hub);
}
static SIMPLE_DEV_PM_OPS(usb251xb_pm_ops, usb251xb_suspend, usb251xb_resume);
static const struct i2c_device_id usb251xb_id[] = {
{ "usb2422" },
{ "usb2512b" },
{ "usb2512bi" },
{ "usb2513b" },
{ "usb2513bi" },
{ "usb2514b" },
{ "usb2514bi" },
{ "usb2517" },
{ "usb2517i" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(i2c, usb251xb_id);
static struct i2c_driver usb251xb_i2c_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = of_match_ptr(usb251xb_of_match),
.pm = &usb251xb_pm_ops,
},
.probe = usb251xb_i2c_probe,
.id_table = usb251xb_id,
};
module_i2c_driver(usb251xb_i2c_driver);
MODULE_AUTHOR("Richard Leitner <richard.leitner@skidata.com>");
MODULE_DESCRIPTION("USB251x/xBi USB 2.0 Hub Controller Driver");
MODULE_LICENSE("GPL");
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