[deliverable/linux.git] / drivers / usb / phy / phy-isp1301.c

/*
 * 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>
#include <linux/mutex.h>
#include <linux/i2c.h>
#include <linux/usb/phy.h>
#include <linux/usb/isp1301.h>

#define DRV_NAME		"isp1301"

struct isp1301 {
	struct usb_phy		phy;
	struct mutex		mutex;

	struct i2c_client	*client;
};

#define phy_to_isp(p)		(container_of((p), struct isp1301, phy))

static const struct i2c_device_id isp1301_id[] = {
	{ "isp1301", 0 },
	{ }
};

static struct i2c_client *isp1301_i2c_client;

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;
}

static int isp1301_probe(struct i2c_client *client,
			 const struct i2c_device_id *i2c_id)
{
	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;
	phy->dev = &client->dev;
	phy->label = DRV_NAME;
	phy->init = isp1301_phy_init;
	phy->set_vbus = isp1301_phy_set_vbus;
	phy->type = USB_PHY_TYPE_USB2;

	i2c_set_clientdata(client, isp);
	usb_add_phy_dev(phy);

	isp1301_i2c_client = client;

	return 0;
}

static int isp1301_remove(struct i2c_client *client)
{
	struct isp1301 *isp = i2c_get_clientdata(client);

	usb_remove_phy(&isp->phy);
	isp1301_i2c_client = NULL;

	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");
Commit	Line	Data
8b7c3b68 RS	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>
790d3a5a	14	#include <linux/mutex.h>
8b7c3b68	15	#include <linux/i2c.h>
790d3a5a	16	#include <linux/usb/phy.h>
c38a4f3f	17	#include <linux/usb/isp1301.h>
8b7c3b68 RS	18
	19	#define DRV_NAME "isp1301"
	20
790d3a5a FB	21	struct isp1301 {
	22	struct usb_phy phy;
	23	struct mutex mutex;
	24
	25	struct i2c_client *client;
	26	};
	27
c38a4f3f FB	28	#define phy_to_isp(p) (container_of((p), struct isp1301, phy))
c38a4f3f FB	29
8b7c3b68 RS	30	static const struct i2c_device_id isp1301_id[] = {
	31	{ "isp1301", 0 },
	32	{ }
	33	};
	34
	35	static struct i2c_client *isp1301_i2c_client;
	36
c38a4f3f FB	37	static 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
	42	static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
	43	{
	44	return __isp1301_write(isp, reg, value, 0);
	45	}
	46
	47	static 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
	52	static 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
	79	static 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
8b7c3b68 RS	91	static int isp1301_probe(struct i2c_client *client,
	92	const struct i2c_device_id *i2c_id)
	93	{
790d3a5a FB	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;
1abd8b31	105	phy->dev = &client->dev;
790d3a5a	106	phy->label = DRV_NAME;
c38a4f3f FB	107	phy->init = isp1301_phy_init;
c38a4f3f FB	108	phy->set_vbus = isp1301_phy_set_vbus;
790d3a5a FB	109	phy->type = USB_PHY_TYPE_USB2;
	110
	111	i2c_set_clientdata(client, isp);
	112	usb_add_phy_dev(phy);
	113
8b7c3b68	114	isp1301_i2c_client = client;
790d3a5a	115
8b7c3b68 RS	116	return 0;
	117	}
	118
	119	static int isp1301_remove(struct i2c_client *client)
	120	{
790d3a5a FB	121	struct isp1301 *isp = i2c_get_clientdata(client);
	122
	123	usb_remove_phy(&isp->phy);
	124	isp1301_i2c_client = NULL;
	125
8b7c3b68 RS	126	return 0;
	127	}
	128
	129	static 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
	138	module_i2c_driver(isp1301_driver);
	139
	140	static 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
	147	struct 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	}
	159	EXPORT_SYMBOL_GPL(isp1301_get_client);
	160
	161	MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
	162	MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
	163	MODULE_LICENSE("GPL");