164 lines
4 KiB
C
164 lines
4 KiB
C
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/*
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* NXP ISP1301 USB transceiver driver
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*
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* Copyright (C) 2012 Roland Stigge
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*
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* Author: Roland Stigge <stigge@antcom.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/i2c.h>
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#include <linux/usb/phy.h>
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#include <linux/usb/isp1301.h>
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#define DRV_NAME "isp1301"
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struct isp1301 {
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struct usb_phy phy;
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struct mutex mutex;
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struct i2c_client *client;
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};
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#define phy_to_isp(p) (container_of((p), struct isp1301, phy))
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static const struct i2c_device_id isp1301_id[] = {
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{ "isp1301", 0 },
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{ }
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};
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static struct i2c_client *isp1301_i2c_client;
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static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
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{
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return i2c_smbus_write_byte_data(isp->client, reg | clear, value);
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}
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static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
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{
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return __isp1301_write(isp, reg, value, 0);
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}
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static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
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{
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return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
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}
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static int isp1301_phy_init(struct usb_phy *phy)
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{
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struct isp1301 *isp = phy_to_isp(phy);
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/* Disable transparent UART mode first */
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isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
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isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
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isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
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isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
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isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN
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| MC2_SPD_SUSP_CTRL));
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isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
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isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
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isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
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| OTG1_DP_PULLDOWN));
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isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
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| OTG1_DP_PULLUP));
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/* mask all interrupts */
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isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
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isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
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isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);
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return 0;
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}
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static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
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{
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struct isp1301 *isp = phy_to_isp(phy);
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if (on)
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isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
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else
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isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
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return 0;
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}
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static int isp1301_probe(struct i2c_client *client,
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const struct i2c_device_id *i2c_id)
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{
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struct isp1301 *isp;
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struct usb_phy *phy;
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isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
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if (!isp)
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return -ENOMEM;
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isp->client = client;
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mutex_init(&isp->mutex);
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phy = &isp->phy;
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phy->dev = &client->dev;
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phy->label = DRV_NAME;
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phy->init = isp1301_phy_init;
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phy->set_vbus = isp1301_phy_set_vbus;
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phy->type = USB_PHY_TYPE_USB2;
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i2c_set_clientdata(client, isp);
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usb_add_phy_dev(phy);
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isp1301_i2c_client = client;
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return 0;
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}
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static int isp1301_remove(struct i2c_client *client)
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{
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struct isp1301 *isp = i2c_get_clientdata(client);
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usb_remove_phy(&isp->phy);
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isp1301_i2c_client = NULL;
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return 0;
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}
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static struct i2c_driver isp1301_driver = {
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.driver = {
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.name = DRV_NAME,
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},
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.probe = isp1301_probe,
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.remove = isp1301_remove,
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.id_table = isp1301_id,
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};
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module_i2c_driver(isp1301_driver);
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static int match(struct device *dev, void *data)
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{
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struct device_node *node = (struct device_node *)data;
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return (dev->of_node == node) &&
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(dev->driver == &isp1301_driver.driver);
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}
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struct i2c_client *isp1301_get_client(struct device_node *node)
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{
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if (node) { /* reference of ISP1301 I2C node via DT */
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struct device *dev = bus_find_device(&i2c_bus_type, NULL,
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node, match);
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if (!dev)
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return NULL;
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return to_i2c_client(dev);
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} else { /* non-DT: only one ISP1301 chip supported */
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return isp1301_i2c_client;
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}
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}
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EXPORT_SYMBOL_GPL(isp1301_get_client);
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MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
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MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
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MODULE_LICENSE("GPL");
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