1 /* 2 * Nano River Technologies viperboard driver 3 * 4 * This is the core driver for the viperboard. There are cell drivers 5 * available for I2C, ADC and both GPIOs. SPI is not yet supported. 6 * The drivers do not support all features the board exposes. See user 7 * manual of the viperboard. 8 * 9 * (C) 2012 by Lemonage GmbH 10 * Author: Lars Poeschel <poeschel@lemonage.de> 11 * All rights reserved. 12 * 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License as published by the 15 * Free Software Foundation; either version 2 of the License, or (at your 16 * option) any later version. 17 * 18 */ 19 20 #include <linux/kernel.h> 21 #include <linux/errno.h> 22 #include <linux/module.h> 23 #include <linux/slab.h> 24 #include <linux/types.h> 25 #include <linux/mutex.h> 26 27 #include <linux/mfd/core.h> 28 #include <linux/mfd/viperboard.h> 29 30 #include <linux/usb.h> 31 32 33 static const struct usb_device_id vprbrd_table[] = { 34 { USB_DEVICE(0x2058, 0x1005) }, /* Nano River Technologies */ 35 { } /* Terminating entry */ 36 }; 37 38 MODULE_DEVICE_TABLE(usb, vprbrd_table); 39 40 static struct mfd_cell vprbrd_devs[] = { 41 }; 42 43 static int vprbrd_probe(struct usb_interface *interface, 44 const struct usb_device_id *id) 45 { 46 struct vprbrd *vb; 47 48 u16 version = 0; 49 int pipe, ret; 50 unsigned char buf[1]; 51 52 /* allocate memory for our device state and initialize it */ 53 vb = kzalloc(sizeof(*vb), GFP_KERNEL); 54 if (vb == NULL) { 55 dev_err(&interface->dev, "Out of memory\n"); 56 return -ENOMEM; 57 } 58 59 mutex_init(&vb->lock); 60 61 vb->usb_dev = usb_get_dev(interface_to_usbdev(interface)); 62 63 /* save our data pointer in this interface device */ 64 usb_set_intfdata(interface, vb); 65 dev_set_drvdata(&vb->pdev.dev, vb); 66 67 /* get version information, major first, minor then */ 68 pipe = usb_rcvctrlpipe(vb->usb_dev, 0); 69 ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR, 70 VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, buf, 1, 71 VPRBRD_USB_TIMEOUT_MS); 72 if (ret == 1) 73 version = buf[0]; 74 75 ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR, 76 VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, buf, 1, 77 VPRBRD_USB_TIMEOUT_MS); 78 if (ret == 1) { 79 version <<= 8; 80 version = version | buf[0]; 81 } 82 83 dev_info(&interface->dev, 84 "version %x.%02x found at bus %03d address %03d\n", 85 version >> 8, version & 0xff, 86 vb->usb_dev->bus->busnum, vb->usb_dev->devnum); 87 88 ret = mfd_add_devices(&interface->dev, -1, vprbrd_devs, 89 ARRAY_SIZE(vprbrd_devs), NULL, 0, NULL); 90 if (ret != 0) { 91 dev_err(&interface->dev, "Failed to add mfd devices to core."); 92 goto error; 93 } 94 95 return 0; 96 97 error: 98 if (vb) { 99 usb_put_dev(vb->usb_dev); 100 kfree(vb); 101 } 102 103 return ret; 104 } 105 106 static void vprbrd_disconnect(struct usb_interface *interface) 107 { 108 struct vprbrd *vb = usb_get_intfdata(interface); 109 110 mfd_remove_devices(&interface->dev); 111 usb_set_intfdata(interface, NULL); 112 usb_put_dev(vb->usb_dev); 113 kfree(vb); 114 115 dev_dbg(&interface->dev, "disconnected\n"); 116 } 117 118 static struct usb_driver vprbrd_driver = { 119 .name = "viperboard", 120 .probe = vprbrd_probe, 121 .disconnect = vprbrd_disconnect, 122 .id_table = vprbrd_table, 123 }; 124 125 module_usb_driver(vprbrd_driver); 126 127 MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver"); 128 MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>"); 129 MODULE_LICENSE("GPL"); 130