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 const struct of_device_id isp1301_of_match[] = { 37 {.compatible = "nxp,isp1301" }, 38 { }, 39 }; 40 MODULE_DEVICE_TABLE(of, isp1301_of_match); 41 42 static struct i2c_client *isp1301_i2c_client; 43 44 static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear) 45 { 46 return i2c_smbus_write_byte_data(isp->client, reg | clear, value); 47 } 48 49 static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value) 50 { 51 return __isp1301_write(isp, reg, value, 0); 52 } 53 54 static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value) 55 { 56 return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR); 57 } 58 59 static int isp1301_phy_init(struct usb_phy *phy) 60 { 61 struct isp1301 *isp = phy_to_isp(phy); 62 63 /* Disable transparent UART mode first */ 64 isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN); 65 isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG); 66 isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG); 67 isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0); 68 isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN 69 | MC2_SPD_SUSP_CTRL)); 70 71 isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0); 72 isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0); 73 isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN 74 | OTG1_DP_PULLDOWN)); 75 isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP 76 | OTG1_DP_PULLUP)); 77 78 /* mask all interrupts */ 79 isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0); 80 isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0); 81 isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0); 82 83 return 0; 84 } 85 86 static int isp1301_phy_set_vbus(struct usb_phy *phy, int on) 87 { 88 struct isp1301 *isp = phy_to_isp(phy); 89 90 if (on) 91 isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV); 92 else 93 isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV); 94 95 return 0; 96 } 97 98 static int isp1301_probe(struct i2c_client *client, 99 const struct i2c_device_id *i2c_id) 100 { 101 struct isp1301 *isp; 102 struct usb_phy *phy; 103 104 isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL); 105 if (!isp) 106 return -ENOMEM; 107 108 isp->client = client; 109 mutex_init(&isp->mutex); 110 111 phy = &isp->phy; 112 phy->dev = &client->dev; 113 phy->label = DRV_NAME; 114 phy->init = isp1301_phy_init; 115 phy->set_vbus = isp1301_phy_set_vbus; 116 phy->type = USB_PHY_TYPE_USB2; 117 118 i2c_set_clientdata(client, isp); 119 usb_add_phy_dev(phy); 120 121 isp1301_i2c_client = client; 122 123 return 0; 124 } 125 126 static int isp1301_remove(struct i2c_client *client) 127 { 128 struct isp1301 *isp = i2c_get_clientdata(client); 129 130 usb_remove_phy(&isp->phy); 131 isp1301_i2c_client = NULL; 132 133 return 0; 134 } 135 136 static struct i2c_driver isp1301_driver = { 137 .driver = { 138 .name = DRV_NAME, 139 .of_match_table = isp1301_of_match, 140 }, 141 .probe = isp1301_probe, 142 .remove = isp1301_remove, 143 .id_table = isp1301_id, 144 }; 145 146 module_i2c_driver(isp1301_driver); 147 148 static int match(struct device *dev, void *data) 149 { 150 struct device_node *node = (struct device_node *)data; 151 return (dev->of_node == node) && 152 (dev->driver == &isp1301_driver.driver); 153 } 154 155 struct i2c_client *isp1301_get_client(struct device_node *node) 156 { 157 if (node) { /* reference of ISP1301 I2C node via DT */ 158 struct device *dev = bus_find_device(&i2c_bus_type, NULL, 159 node, match); 160 if (!dev) 161 return NULL; 162 return to_i2c_client(dev); 163 } else { /* non-DT: only one ISP1301 chip supported */ 164 return isp1301_i2c_client; 165 } 166 } 167 EXPORT_SYMBOL_GPL(isp1301_get_client); 168 169 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); 170 MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver"); 171 MODULE_LICENSE("GPL"); 172