8fb7ab5043
The I2C core always reports the MODALIAS uevent as "i2c:<client name" regardless if the device was registered using OF or platform code so So the driver needs to export the I2C table and this be built into the module or udev won't have the necessary information to auto load the module when the device is added. Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
165 lines
4 KiB
C
165 lines
4 KiB
C
/*
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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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MODULE_DEVICE_TABLE(i2c, isp1301_id);
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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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