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                          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
 123 static 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
 133 static 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
 143 module_i2c_driver(isp1301_driver);
 144
 145 static 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
 152 struct 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 }
 164 EXPORT_SYMBOL_GPL(isp1301_get_client);
 165
 166 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
 167 MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
 168 MODULE_LICENSE("GPL");