drivers/usb/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/i2c.h>
  15
  16 #define DRV_NAME                "isp1301"
  17
  18 #define ISP1301_I2C_ADDR        0x2C
  19
  20 static const unsigned short normal_i2c[] = {
  21         ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END
  22 };
  23
  24 static const struct i2c_device_id isp1301_id[] = {
  25         { "isp1301", 0 },
  26         { }
  27 };
  28
  29 static struct i2c_client *isp1301_i2c_client;
  30
  31 static int isp1301_probe(struct i2c_client *client,
  32                          const struct i2c_device_id *i2c_id)
  33 {
  34         isp1301_i2c_client = client;
  35         return 0;
  36 }
  37
  38 static int isp1301_remove(struct i2c_client *client)
  39 {
  40         return 0;
  41 }
  42
  43 static struct i2c_driver isp1301_driver = {
  44         .driver = {
  45                 .name = DRV_NAME,
  46         },
  47         .probe = isp1301_probe,
  48         .remove = isp1301_remove,
  49         .id_table = isp1301_id,
  50 };
  51
  52 module_i2c_driver(isp1301_driver);
  53
  54 static int match(struct device *dev, void *data)
  55 {
  56         struct device_node *node = (struct device_node *)data;
  57         return (dev->of_node == node) &&
  58                 (dev->driver == &isp1301_driver.driver);
  59 }
  60
  61 struct i2c_client *isp1301_get_client(struct device_node *node)
  62 {
  63         if (node) { /* reference of ISP1301 I2C node via DT */
  64                 struct device *dev = bus_find_device(&i2c_bus_type, NULL,
  65                                                      node, match);
  66                 if (!dev)
  67                         return NULL;
  68                 return to_i2c_client(dev);
  69         } else { /* non-DT: only one ISP1301 chip supported */
  70                 return isp1301_i2c_client;
  71         }
  72 }
  73 EXPORT_SYMBOL_GPL(isp1301_get_client);
  74
  75 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
  76 MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
  77 MODULE_LICENSE("GPL");