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linux/drivers/usb/phy/phy-isp1301.c

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USB: Add driver for NXP ISP1301 USB transceiver This new driver registers the NXP ISP1301 chip via the I2C subsystem. The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and isp1301_omap. ISP1301 is a very low-level driver that primarily separates out the I2C client registration of the ISP1301 chip (including instantiation via DT), used by other drivers, and declares the chip's registers. It's only a helper driver for some OHCI and USB device drivers. The driver can be considered as a register set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know best what to do with the low level functionality (individual ISP1301 registers and timing, see the different initialization strategies in those drivers). Those drivers previously internally duplicated ISP1301 register definitions which is solved by this new isp1301 driver. The ISP1301 registers exposed via isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*() accesses. Following patches let the respective USB host and gadget drivers use this driver, instead of duplicating ISP1301 handling. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 18:47:04 +04:00
/*
* NXP ISP1301 USB transceiver driver
*
* Copyright (C) 2012 Roland Stigge
*
* Author: Roland Stigge <stigge@antcom.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
usb: phy: isp1301: give it a context structure this patch is a small preparation to fix isp1301 driver so that other platforms can use it. We're defining our private data structure to represent this device and adding the PHY to the PHY list. Later patches will come implementing proper PHY API and removing bogus code from ohci_nxp and lpc32xx_udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:01:40 +04:00
#include <linux/mutex.h>
USB: Add driver for NXP ISP1301 USB transceiver This new driver registers the NXP ISP1301 chip via the I2C subsystem. The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and isp1301_omap. ISP1301 is a very low-level driver that primarily separates out the I2C client registration of the ISP1301 chip (including instantiation via DT), used by other drivers, and declares the chip's registers. It's only a helper driver for some OHCI and USB device drivers. The driver can be considered as a register set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know best what to do with the low level functionality (individual ISP1301 registers and timing, see the different initialization strategies in those drivers). Those drivers previously internally duplicated ISP1301 register definitions which is solved by this new isp1301 driver. The ISP1301 registers exposed via isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*() accesses. Following patches let the respective USB host and gadget drivers use this driver, instead of duplicating ISP1301 handling. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 18:47:04 +04:00
#include <linux/i2c.h>
usb: phy: isp1301: give it a context structure this patch is a small preparation to fix isp1301 driver so that other platforms can use it. We're defining our private data structure to represent this device and adding the PHY to the PHY list. Later patches will come implementing proper PHY API and removing bogus code from ohci_nxp and lpc32xx_udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:01:40 +04:00
#include <linux/usb/phy.h>
usb: phy: isp1301: implement PHY API this patch implements ->init() and ->set_vbus() methods for isp1301 transceiver driver. Later patches can now come in order to remove the hackery from ohci-nxp and lpc32xx udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:25:18 +04:00
#include <linux/usb/isp1301.h>
USB: Add driver for NXP ISP1301 USB transceiver This new driver registers the NXP ISP1301 chip via the I2C subsystem. The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and isp1301_omap. ISP1301 is a very low-level driver that primarily separates out the I2C client registration of the ISP1301 chip (including instantiation via DT), used by other drivers, and declares the chip's registers. It's only a helper driver for some OHCI and USB device drivers. The driver can be considered as a register set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know best what to do with the low level functionality (individual ISP1301 registers and timing, see the different initialization strategies in those drivers). Those drivers previously internally duplicated ISP1301 register definitions which is solved by this new isp1301 driver. The ISP1301 registers exposed via isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*() accesses. Following patches let the respective USB host and gadget drivers use this driver, instead of duplicating ISP1301 handling. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 18:47:04 +04:00
#define DRV_NAME "isp1301"
usb: phy: isp1301: give it a context structure this patch is a small preparation to fix isp1301 driver so that other platforms can use it. We're defining our private data structure to represent this device and adding the PHY to the PHY list. Later patches will come implementing proper PHY API and removing bogus code from ohci_nxp and lpc32xx_udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:01:40 +04:00
struct isp1301 {
struct usb_phy phy;
struct mutex mutex;
struct i2c_client *client;
};
usb: phy: isp1301: implement PHY API this patch implements ->init() and ->set_vbus() methods for isp1301 transceiver driver. Later patches can now come in order to remove the hackery from ohci-nxp and lpc32xx udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:25:18 +04:00
#define phy_to_isp(p) (container_of((p), struct isp1301, phy))
USB: Add driver for NXP ISP1301 USB transceiver This new driver registers the NXP ISP1301 chip via the I2C subsystem. The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and isp1301_omap. ISP1301 is a very low-level driver that primarily separates out the I2C client registration of the ISP1301 chip (including instantiation via DT), used by other drivers, and declares the chip's registers. It's only a helper driver for some OHCI and USB device drivers. The driver can be considered as a register set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know best what to do with the low level functionality (individual ISP1301 registers and timing, see the different initialization strategies in those drivers). Those drivers previously internally duplicated ISP1301 register definitions which is solved by this new isp1301 driver. The ISP1301 registers exposed via isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*() accesses. Following patches let the respective USB host and gadget drivers use this driver, instead of duplicating ISP1301 handling. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 18:47:04 +04:00
static const struct i2c_device_id isp1301_id[] = {
{ "isp1301", 0 },
{ }
};
static struct i2c_client *isp1301_i2c_client;
usb: phy: isp1301: implement PHY API this patch implements ->init() and ->set_vbus() methods for isp1301 transceiver driver. Later patches can now come in order to remove the hackery from ohci-nxp and lpc32xx udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:25:18 +04:00
static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
{
return i2c_smbus_write_byte_data(isp->client, reg | clear, value);
}
static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
{
return __isp1301_write(isp, reg, value, 0);
}
static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
{
return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
}
static int isp1301_phy_init(struct usb_phy *phy)
{
struct isp1301 *isp = phy_to_isp(phy);
/* Disable transparent UART mode first */
isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN
| MC2_SPD_SUSP_CTRL));
isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
| OTG1_DP_PULLDOWN));
isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
| OTG1_DP_PULLUP));
/* mask all interrupts */
isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);
return 0;
}
static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
{
struct isp1301 *isp = phy_to_isp(phy);
if (on)
isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
else
isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
return 0;
}
USB: Add driver for NXP ISP1301 USB transceiver This new driver registers the NXP ISP1301 chip via the I2C subsystem. The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and isp1301_omap. ISP1301 is a very low-level driver that primarily separates out the I2C client registration of the ISP1301 chip (including instantiation via DT), used by other drivers, and declares the chip's registers. It's only a helper driver for some OHCI and USB device drivers. The driver can be considered as a register set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know best what to do with the low level functionality (individual ISP1301 registers and timing, see the different initialization strategies in those drivers). Those drivers previously internally duplicated ISP1301 register definitions which is solved by this new isp1301 driver. The ISP1301 registers exposed via isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*() accesses. Following patches let the respective USB host and gadget drivers use this driver, instead of duplicating ISP1301 handling. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 18:47:04 +04:00
static int isp1301_probe(struct i2c_client *client,
const struct i2c_device_id *i2c_id)
{
usb: phy: isp1301: give it a context structure this patch is a small preparation to fix isp1301 driver so that other platforms can use it. We're defining our private data structure to represent this device and adding the PHY to the PHY list. Later patches will come implementing proper PHY API and removing bogus code from ohci_nxp and lpc32xx_udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:01:40 +04:00
struct isp1301 *isp;
struct usb_phy *phy;
isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
if (!isp)
return -ENOMEM;
isp->client = client;
mutex_init(&isp->mutex);
phy = &isp->phy;
usb: phy: Fix NULL pointer exception during usb_get_phy Upon initialisation (driver probe) a NULL pointer exception is triggered. This is due to lack of initialisation of device field in phy structure, which is used by phy framework in usb_get_phy(). Fix it by initialising the device field. Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-05-10 13:45:08 +04:00
phy->dev = &client->dev;
usb: phy: isp1301: give it a context structure this patch is a small preparation to fix isp1301 driver so that other platforms can use it. We're defining our private data structure to represent this device and adding the PHY to the PHY list. Later patches will come implementing proper PHY API and removing bogus code from ohci_nxp and lpc32xx_udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:01:40 +04:00
phy->label = DRV_NAME;
usb: phy: isp1301: implement PHY API this patch implements ->init() and ->set_vbus() methods for isp1301 transceiver driver. Later patches can now come in order to remove the hackery from ohci-nxp and lpc32xx udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:25:18 +04:00
phy->init = isp1301_phy_init;
phy->set_vbus = isp1301_phy_set_vbus;
usb: phy: isp1301: give it a context structure this patch is a small preparation to fix isp1301 driver so that other platforms can use it. We're defining our private data structure to represent this device and adding the PHY to the PHY list. Later patches will come implementing proper PHY API and removing bogus code from ohci_nxp and lpc32xx_udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:01:40 +04:00
phy->type = USB_PHY_TYPE_USB2;
i2c_set_clientdata(client, isp);
usb_add_phy_dev(phy);
USB: Add driver for NXP ISP1301 USB transceiver This new driver registers the NXP ISP1301 chip via the I2C subsystem. The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and isp1301_omap. ISP1301 is a very low-level driver that primarily separates out the I2C client registration of the ISP1301 chip (including instantiation via DT), used by other drivers, and declares the chip's registers. It's only a helper driver for some OHCI and USB device drivers. The driver can be considered as a register set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know best what to do with the low level functionality (individual ISP1301 registers and timing, see the different initialization strategies in those drivers). Those drivers previously internally duplicated ISP1301 register definitions which is solved by this new isp1301 driver. The ISP1301 registers exposed via isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*() accesses. Following patches let the respective USB host and gadget drivers use this driver, instead of duplicating ISP1301 handling. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 18:47:04 +04:00
isp1301_i2c_client = client;
usb: phy: isp1301: give it a context structure this patch is a small preparation to fix isp1301 driver so that other platforms can use it. We're defining our private data structure to represent this device and adding the PHY to the PHY list. Later patches will come implementing proper PHY API and removing bogus code from ohci_nxp and lpc32xx_udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:01:40 +04:00
USB: Add driver for NXP ISP1301 USB transceiver This new driver registers the NXP ISP1301 chip via the I2C subsystem. The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and isp1301_omap. ISP1301 is a very low-level driver that primarily separates out the I2C client registration of the ISP1301 chip (including instantiation via DT), used by other drivers, and declares the chip's registers. It's only a helper driver for some OHCI and USB device drivers. The driver can be considered as a register set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know best what to do with the low level functionality (individual ISP1301 registers and timing, see the different initialization strategies in those drivers). Those drivers previously internally duplicated ISP1301 register definitions which is solved by this new isp1301 driver. The ISP1301 registers exposed via isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*() accesses. Following patches let the respective USB host and gadget drivers use this driver, instead of duplicating ISP1301 handling. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 18:47:04 +04:00
return 0;
}
static int isp1301_remove(struct i2c_client *client)
{
usb: phy: isp1301: give it a context structure this patch is a small preparation to fix isp1301 driver so that other platforms can use it. We're defining our private data structure to represent this device and adding the PHY to the PHY list. Later patches will come implementing proper PHY API and removing bogus code from ohci_nxp and lpc32xx_udc drivers. Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-03-08 15:01:40 +04:00
struct isp1301 *isp = i2c_get_clientdata(client);
usb_remove_phy(&isp->phy);
isp1301_i2c_client = NULL;
USB: Add driver for NXP ISP1301 USB transceiver This new driver registers the NXP ISP1301 chip via the I2C subsystem. The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and isp1301_omap. ISP1301 is a very low-level driver that primarily separates out the I2C client registration of the ISP1301 chip (including instantiation via DT), used by other drivers, and declares the chip's registers. It's only a helper driver for some OHCI and USB device drivers. The driver can be considered as a register set extension of ohci-nxp, lpc32xx-udc and isp1301_omap, which in turn know best what to do with the low level functionality (individual ISP1301 registers and timing, see the different initialization strategies in those drivers). Those drivers previously internally duplicated ISP1301 register definitions which is solved by this new isp1301 driver. The ISP1301 registers exposed via isp1301.h can be accessed by other drivers using it with standard i2c_smbus_*() accesses. Following patches let the respective USB host and gadget drivers use this driver, instead of duplicating ISP1301 handling. Signed-off-by: Roland Stigge <stigge@antcom.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 18:47:04 +04:00
return 0;
}
static struct i2c_driver isp1301_driver = {
.driver = {
.name = DRV_NAME,
},
.probe = isp1301_probe,
.remove = isp1301_remove,
.id_table = isp1301_id,
};
module_i2c_driver(isp1301_driver);
static int match(struct device *dev, void *data)
{
struct device_node *node = (struct device_node *)data;
return (dev->of_node == node) &&
(dev->driver == &isp1301_driver.driver);
}
struct i2c_client *isp1301_get_client(struct device_node *node)
{
if (node) { /* reference of ISP1301 I2C node via DT */
struct device *dev = bus_find_device(&i2c_bus_type, NULL,
node, match);
if (!dev)
return NULL;
return to_i2c_client(dev);
} else { /* non-DT: only one ISP1301 chip supported */
return isp1301_i2c_client;
}
}
EXPORT_SYMBOL_GPL(isp1301_get_client);
MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
MODULE_LICENSE("GPL");
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