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> 14 #include <linux/mutex.h> 15 #include <linux/i2c.h> 16 #include <linux/usb/phy.h> 17 #include <linux/usb/isp1301.h> 18 19 #define DRV_NAME "isp1301" 20 21 struct isp1301 { 22 struct usb_phy phy; 23 struct mutex mutex; 24 25 struct i2c_client *client; 26 }; 27 28 #define phy_to_isp(p) (container_of((p), struct isp1301, phy)) 29 30 static const struct i2c_device_id isp1301_id[] = { 31 { "isp1301", 0 }, 32 { } 33 }; 34 35 static struct i2c_client *isp1301_i2c_client; 36 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 91 static int isp1301_probe(struct i2c_client *client, 92 const struct i2c_device_id *i2c_id) 93 { 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; 105 phy->dev = &client->dev; 106 phy->label = DRV_NAME; 107 phy->init = isp1301_phy_init; 108 phy->set_vbus = isp1301_phy_set_vbus; 109 phy->type = USB_PHY_TYPE_USB2; 110 111 i2c_set_clientdata(client, isp); 112 usb_add_phy_dev(phy); 113 114 isp1301_i2c_client = client; 115 116 return 0; 117 } 118 119 static int isp1301_remove(struct i2c_client *client) 120 { 121 struct isp1301 *isp = i2c_get_clientdata(client); 122 123 usb_remove_phy(&isp->phy); 124 isp1301_i2c_client = NULL; 125 126 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"); 164