drivers/usb/phy/phy-isp1301.c

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