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/*
* 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/
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/nls.h>
#include <linux/of_device.h>
#include <linux/of_gpio.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_DEF_PRODUCT_ID_12 0x2512 /* USB2512B/12Bi */
#define USB251XB_DEF_PRODUCT_ID_13 0x2513 /* USB2513B/13Bi */
#define USB251XB_DEF_PRODUCT_ID_14 0x2514 /* USB2514B/14Bi */
#define USB251XB_DEF_PRODUCT_ID_17 0x2517 /* USB2517/17i */
#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_DEF_PRODUCT_STRING "USB251xB/xBi/7i"
#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;
u8 skip_config;
int 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 bat_support;
char product_str[USB251XB_STRING_BUFSIZE / 2]; /* ASCII string */
};
static const struct usb251xb_data usb2512b_data = {
.product_id = 0x2512,
.port_cnt = 2,
.bat_support = true,
.product_str = "USB2512B",
};
static const struct usb251xb_data usb2512bi_data = {
.product_id = 0x2512,
.port_cnt = 2,
.bat_support = true,
.product_str = "USB2512Bi",
};
static const struct usb251xb_data usb2513b_data = {
.product_id = 0x2513,
.port_cnt = 3,
.bat_support = true,
.product_str = "USB2513B",
};
static const struct usb251xb_data usb2513bi_data = {
.product_id = 0x2513,
.port_cnt = 3,
.bat_support = true,
.product_str = "USB2513Bi",
};
static const struct usb251xb_data usb2514b_data = {
.product_id = 0x2514,
.port_cnt = 4,
.bat_support = true,
.product_str = "USB2514B",
};
static const struct usb251xb_data usb2514bi_data = {
.product_id = 0x2514,
.port_cnt = 4,
.bat_support = true,
.product_str = "USB2514Bi",
};
static const struct usb251xb_data usb2517_data = {
.product_id = 0x2517,
.port_cnt = 7,
.bat_support = false,
.product_str = "USB2517",
};
static const struct usb251xb_data usb2517i_data = {
.product_id = 0x2517,
.port_cnt = 7,
.bat_support = false,
.product_str = "USB2517i",
};
static void usb251xb_reset(struct usb251xb *hub, int state)
{
if (!gpio_is_valid(hub->gpio_reset))
return;
gpio_set_value_cansleep(hub->gpio_reset, state);
/* wait for hub recovery/stabilization */
if (state)
usleep_range(500, 750); /* >=500us at power on */
else
usleep_range(1, 10); /* >=1us at power down */
}
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, 1);
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;
i2
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