LXR linux/drivers/usb/phy/phy-isp1301.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * NXP ISP1301 USB transceiver driver
   4 *
   5 * Copyright (C) 2012 Roland Stigge
   6 *
   7 * Author: Roland Stigge <stigge@antcom.de>
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/mutex.h>
  12#include <linux/i2c.h>
  13#include <linux/usb/phy.h>
  14#include <linux/usb/isp1301.h>
  15
  16#define DRV_NAME                "isp1301"
  17
  18struct isp1301 {
  19        struct usb_phy          phy;
  20        struct mutex            mutex;
  21
  22        struct i2c_client       *client;
  23};
  24
  25#define phy_to_isp(p)           (container_of((p), struct isp1301, phy))
  26
  27static const struct i2c_device_id isp1301_id[] = {
  28        { "isp1301", 0 },
  29        { }
  30};
  31MODULE_DEVICE_TABLE(i2c, isp1301_id);
  32
  33static const struct of_device_id isp1301_of_match[] = {
  34        {.compatible = "nxp,isp1301" },
  35        { },
  36};
  37MODULE_DEVICE_TABLE(of, isp1301_of_match);
  38
  39static struct i2c_client *isp1301_i2c_client;
  40
  41static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
  42{
  43        return i2c_smbus_write_byte_data(isp->client, reg | clear, value);
  44}
  45
  46static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
  47{
  48        return __isp1301_write(isp, reg, value, 0);
  49}
  50
  51static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
  52{
  53        return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
  54}
  55
  56static int isp1301_phy_init(struct usb_phy *phy)
  57{
  58        struct isp1301 *isp = phy_to_isp(phy);
  59
  60        /* Disable transparent UART mode first */
  61        isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
  62        isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
  63        isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
  64        isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
  65        isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN
  66                                | MC2_SPD_SUSP_CTRL));
  67
  68        isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
  69        isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
  70        isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
  71                                | OTG1_DP_PULLDOWN));
  72        isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
  73                                | OTG1_DP_PULLUP));
  74
  75        /* mask all interrupts */
  76        isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
  77        isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
  78        isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);
  79
  80        return 0;
  81}
  82
  83static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
  84{
  85        struct isp1301 *isp = phy_to_isp(phy);
  86
  87        if (on)
  88                isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
  89        else
  90                isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
  91
  92        return 0;
  93}
  94
  95static int isp1301_probe(struct i2c_client *client,
  96                         const struct i2c_device_id *i2c_id)
  97{
  98        struct isp1301 *isp;
  99        struct usb_phy *phy;
 100
 101        isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
 102        if (!isp)
 103                return -ENOMEM;
 104
 105        isp->client = client;
 106        mutex_init(&isp->mutex);
 107
 108        phy = &isp->phy;
 109        phy->dev = &client->dev;
 110        phy->label = DRV_NAME;
 111        phy->init = isp1301_phy_init;
 112        phy->set_vbus = isp1301_phy_set_vbus;
 113        phy->type = USB_PHY_TYPE_USB2;
 114
 115        i2c_set_clientdata(client, isp);
 116        usb_add_phy_dev(phy);
 117
 118        isp1301_i2c_client = client;
 119
 120        return 0;
 121}
 122
 123static int isp1301_remove(struct i2c_client *client)
 124{
 125        struct isp1301 *isp = i2c_get_clientdata(client);
 126
 127        usb_remove_phy(&isp->phy);
 128        isp1301_i2c_client = NULL;
 129
 130        return 0;
 131}
 132
 133static struct i2c_driver isp1301_driver = {
 134        .driver = {
 135                .name = DRV_NAME,
 136                .of_match_table = isp1301_of_match,
 137        },
 138        .probe = isp1301_probe,
 139        .remove = isp1301_remove,
 140        .id_table = isp1301_id,
 141};
 142
 143module_i2c_driver(isp1301_driver);
 144
 145static int match(struct device *dev, const void *data)
 146{
 147        const struct device_node *node = (const struct device_node *)data;
 148        return (dev->of_node == node) &&
 149                (dev->driver == &isp1301_driver.driver);
 150}
 151
 152struct i2c_client *isp1301_get_client(struct device_node *node)
 153{
 154        if (node) { /* reference of ISP1301 I2C node via DT */
 155                struct device *dev = bus_find_device(&i2c_bus_type, NULL,
 156                                                     node, match);
 157                if (!dev)
 158                        return NULL;
 159                return to_i2c_client(dev);
 160        } else { /* non-DT: only one ISP1301 chip supported */
 161                return isp1301_i2c_client;
 162        }
 163}
 164EXPORT_SYMBOL_GPL(isp1301_get_client);
 165
 166MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
 167MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
 168MODULE_LICENSE("GPL");
 169