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
  18 struct 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
  27 static const struct i2c_device_id isp1301_id[] = {
  28         { "isp1301", 0 },
  29         { }
  30 };
  31 MODULE_DEVICE_TABLE(i2c, isp1301_id);
  32
  33 static const struct of_device_id isp1301_of_match[] = {
  34         {.compatible = "nxp,isp1301" },
  35         { },
  36 };
  37 MODULE_DEVICE_TABLE(of, isp1301_of_match);
  38
  39 static struct i2c_client *isp1301_i2c_client;
  40
  41 static 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
  46 static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
  47 {
  48         return __isp1301_write(isp, reg, value, 0);
  49 }
  50
  51 static 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
  56 static 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
  83 static 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
  95 static int isp1301_probe(struct i2c_client *client)
  96 {
  97         struct isp1301 *isp;
  98         struct usb_phy *phy;
  99
 100         isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
 101         if (!isp)
 102                 return -ENOMEM;
 103
 104         isp->client = client;
 105         mutex_init(&isp->mutex);
 106
 107         phy = &isp->phy;
 108         phy->dev = &client->dev;
 109         phy->label = DRV_NAME;
 110         phy->init = isp1301_phy_init;
 111         phy->set_vbus = isp1301_phy_set_vbus;
 112         phy->type = USB_PHY_TYPE_USB2;
 113
 114         i2c_set_clientdata(client, isp);
 115         usb_add_phy_dev(phy);
 116
 117         isp1301_i2c_client = client;
 118
 119         return 0;
 120 }
 121
 122 static void isp1301_remove(struct i2c_client *client)
 123 {
 124         struct isp1301 *isp = i2c_get_clientdata(client);
 125
 126         usb_remove_phy(&isp->phy);
 127         isp1301_i2c_client = NULL;
 128 }
 129
 130 static struct i2c_driver isp1301_driver = {
 131         .driver = {
 132                 .name = DRV_NAME,
 133                 .of_match_table = isp1301_of_match,
 134         },
 135         .probe = isp1301_probe,
 136         .remove = isp1301_remove,
 137         .id_table = isp1301_id,
 138 };
 139
 140 module_i2c_driver(isp1301_driver);
 141
 142 struct i2c_client *isp1301_get_client(struct device_node *node)
 143 {
 144         struct i2c_client *client;
 145
 146         /* reference of ISP1301 I2C node via DT */
 147         client = of_find_i2c_device_by_node(node);
 148         if (client)
 149                 return client;
 150
 151         /* non-DT: only one ISP1301 chip supported */
 152         return isp1301_i2c_client;
 153 }
 154 EXPORT_SYMBOL_GPL(isp1301_get_client);
 155
 156 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
 157 MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
 158 MODULE_LICENSE("GPL");