1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NXP ISP1301 USB transceiver driver 4 * 5 * Copyright (C) 2012 Roland Stigge 6 * 7 * Author: Roland Stigge <stigge@antcom.de> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/mutex.h> 16 #include <linux/i2c.h> 17 #include <linux/usb/phy.h> 18 #include <linux/usb/isp1301.h> 19 20 #define DRV_NAME "isp1301" 21 22 struct isp1301 { 23 struct usb_phy phy; 24 struct mutex mutex; 25 26 struct i2c_client *client; 27 }; 28 29 #define phy_to_isp(p) (container_of((p), struct isp1301, phy)) 30 31 static const struct i2c_device_id isp1301_id[] = { 32 { "isp1301", 0 }, 33 { } 34 }; 35 MODULE_DEVICE_TABLE(i2c, isp1301_id); 36 37 static const struct of_device_id isp1301_of_match[] = { 38 {.compatible = "nxp,isp1301" }, 39 { }, 40 }; 41 MODULE_DEVICE_TABLE(of, isp1301_of_match); 42 43 static struct i2c_client *isp1301_i2c_client; 44 45 static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear) 46 { 47 return i2c_smbus_write_byte_data(isp->client, reg | clear, value); 48 } 49 50 static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value) 51 { 52 return __isp1301_write(isp, reg, value, 0); 53 } 54 55 static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value) 56 { 57 return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR); 58 } 59 60 static int isp1301_phy_init(struct usb_phy *phy) 61 { 62 struct isp1301 *isp = phy_to_isp(phy); 63 64 /* Disable transparent UART mode first */ 65 isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN); 66 isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG); 67 isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG); 68 isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0); 69 isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN 70 | MC2_SPD_SUSP_CTRL)); 71 72 isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0); 73 isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0); 74 isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN 75 | OTG1_DP_PULLDOWN)); 76 isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP 77 | OTG1_DP_PULLUP)); 78 79 /* mask all interrupts */ 80 isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0); 81 isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0); 82 isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0); 83 84 return 0; 85 } 86 87 static int isp1301_phy_set_vbus(struct usb_phy *phy, int on) 88 { 89 struct isp1301 *isp = phy_to_isp(phy); 90 91 if (on) 92 isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV); 93 else 94 isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV); 95 96 return 0; 97 } 98 99 static int isp1301_probe(struct i2c_client *client, 100 const struct i2c_device_id *i2c_id) 101 { 102 struct isp1301 *isp; 103 struct usb_phy *phy; 104 105 isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL); 106 if (!isp) 107 return -ENOMEM; 108 109 isp->client = client; 110 mutex_init(&isp->mutex); 111 112 phy = &isp->phy; 113 phy->dev = &client->dev; 114 phy->label = DRV_NAME; 115 phy->init = isp1301_phy_init; 116 phy->set_vbus = isp1301_phy_set_vbus; 117 phy->type = USB_PHY_TYPE_USB2; 118 119 i2c_set_clientdata(client, isp); 120 usb_add_phy_dev(phy); 121 122 isp1301_i2c_client = client; 123 124 return 0; 125 } 126 127 static int isp1301_remove(struct i2c_client *client) 128 { 129 struct isp1301 *isp = i2c_get_clientdata(client); 130 131 usb_remove_phy(&isp->phy); 132 isp1301_i2c_client = NULL; 133 134 return 0; 135 } 136 137 static struct i2c_driver isp1301_driver = { 138 .driver = { 139 .name = DRV_NAME, 140 .of_match_table = isp1301_of_match, 141 }, 142 .probe = isp1301_probe, 143 .remove = isp1301_remove, 144 .id_table = isp1301_id, 145 }; 146 147 module_i2c_driver(isp1301_driver); 148 149 static int match(struct device *dev, void *data) 150 { 151 struct device_node *node = (struct device_node *)data; 152 return (dev->of_node == node) && 153 (dev->driver == &isp1301_driver.driver); 154 } 155 156 struct i2c_client *isp1301_get_client(struct device_node *node) 157 { 158 if (node) { /* reference of ISP1301 I2C node via DT */ 159 struct device *dev = bus_find_device(&i2c_bus_type, NULL, 160 node, match); 161 if (!dev) 162 return NULL; 163 return to_i2c_client(dev); 164 } else { /* non-DT: only one ISP1301 chip supported */ 165 return isp1301_i2c_client; 166 } 167 } 168 EXPORT_SYMBOL_GPL(isp1301_get_client); 169 170 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); 171 MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver"); 172 MODULE_LICENSE("GPL"); 173