LXR linux/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
  21struct 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
  30static const struct i2c_device_id isp1301_id[] = {
  31        { "isp1301", 0 },
  32        { }
  33};
  34MODULE_DEVICE_TABLE(i2c, isp1301_id);
  35
  36static const struct of_device_id isp1301_of_match[] = {
  37        {.compatible = "nxp,isp1301" },
  38        { },
  39};
  40MODULE_DEVICE_TABLE(of, isp1301_of_match);
  41
  42static struct i2c_client *isp1301_i2c_client;
  43
  44static 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
  49static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
  50{
  51        return __isp1301_write(isp, reg, value, 0);
  52}
  53
  54static 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
  59static 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
  86static 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
  98static 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
 126static 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
 136static 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
 146module_i2c_driver(isp1301_driver);
 147
 148static 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
 155struct 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}
 167EXPORT_SYMBOL_GPL(isp1301_get_client);
 168
 169MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
 170MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
 171MODULE_LICENSE("GPL");
 172