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