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};
  34
  35static struct i2c_client *isp1301_i2c_client;
  36
  37static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
  38{
  39        return i2c_smbus_write_byte_data(isp->client, reg | clear, value);
  40}
  41
  42static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
  43{
  44        return __isp1301_write(isp, reg, value, 0);
  45}
  46
  47static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
  48{
  49        return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
  50}
  51
  52static int isp1301_phy_init(struct usb_phy *phy)
  53{
  54        struct isp1301 *isp = phy_to_isp(phy);
  55
  56        /* Disable transparent UART mode first */
  57        isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
  58        isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
  59        isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
  60        isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
  61        isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN
  62                                | MC2_SPD_SUSP_CTRL));
  63
  64        isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
  65        isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
  66        isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
  67                                | OTG1_DP_PULLDOWN));
  68        isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
  69                                | OTG1_DP_PULLUP));
  70
  71        /* mask all interrupts */
  72        isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
  73        isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
  74        isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);
  75
  76        return 0;
  77}
  78
  79static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
  80{
  81        struct isp1301 *isp = phy_to_isp(phy);
  82
  83        if (on)
  84                isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
  85        else
  86                isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
  87
  88        return 0;
  89}
  90
  91static int isp1301_probe(struct i2c_client *client,
  92                         const struct i2c_device_id *i2c_id)
  93{
  94        struct isp1301 *isp;
  95        struct usb_phy *phy;
  96
  97        isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
  98        if (!isp)
  99                return -ENOMEM;
 100
 101        isp->client = client;
 102        mutex_init(&isp->mutex);
 103
 104        phy = &isp->phy;
 105        phy->dev = &client->dev;
 106        phy->label = DRV_NAME;
 107        phy->init = isp1301_phy_init;
 108        phy->set_vbus = isp1301_phy_set_vbus;
 109        phy->type = USB_PHY_TYPE_USB2;
 110
 111        i2c_set_clientdata(client, isp);
 112        usb_add_phy_dev(phy);
 113
 114        isp1301_i2c_client = client;
 115
 116        return 0;
 117}
 118
 119static int isp1301_remove(struct i2c_client *client)
 120{
 121        struct isp1301 *isp = i2c_get_clientdata(client);
 122
 123        usb_remove_phy(&isp->phy);
 124        isp1301_i2c_client = NULL;
 125
 126        return 0;
 127}
 128
 129static struct i2c_driver isp1301_driver = {
 130        .driver = {
 131                .name = DRV_NAME,
 132        },
 133        .probe = isp1301_probe,
 134        .remove = isp1301_remove,
 135        .id_table = isp1301_id,
 136};
 137
 138module_i2c_driver(isp1301_driver);
 139
 140static int match(struct device *dev, void *data)
 141{
 142        struct device_node *node = (struct device_node *)data;
 143        return (dev->of_node == node) &&
 144                (dev->driver == &isp1301_driver.driver);
 145}
 146
 147struct i2c_client *isp1301_get_client(struct device_node *node)
 148{
 149        if (node) { /* reference of ISP1301 I2C node via DT */
 150                struct device *dev = bus_find_device(&i2c_bus_type, NULL,
 151                                                     node, match);
 152                if (!dev)
 153                        return NULL;
 154                return to_i2c_client(dev);
 155        } else { /* non-DT: only one ISP1301 chip supported */
 156                return isp1301_i2c_client;
 157        }
 158}
 159EXPORT_SYMBOL_GPL(isp1301_get_client);
 160
 161MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
 162MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
 163MODULE_LICENSE("GPL");
 164