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