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 .name = "viperboard-gpio", 43 }, 44 }; 45 46 static int vprbrd_probe(struct usb_interface *interface, 47 const struct usb_device_id *id) 48 { 49 struct vprbrd *vb; 50 51 u16 version = 0; 52 int pipe, ret; 53 unsigned char buf[1]; 54 55 /* allocate memory for our device state and initialize it */ 56 vb = kzalloc(sizeof(*vb), GFP_KERNEL); 57 if (vb == NULL) { 58 dev_err(&interface->dev, "Out of memory\n"); 59 return -ENOMEM; 60 } 61 62 mutex_init(&vb->lock); 63 64 vb->usb_dev = usb_get_dev(interface_to_usbdev(interface)); 65 66 /* save our data pointer in this interface device */ 67 usb_set_intfdata(interface, vb); 68 dev_set_drvdata(&vb->pdev.dev, vb); 69 70 /* get version information, major first, minor then */ 71 pipe = usb_rcvctrlpipe(vb->usb_dev, 0); 72 ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR, 73 VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, buf, 1, 74 VPRBRD_USB_TIMEOUT_MS); 75 if (ret == 1) 76 version = buf[0]; 77 78 ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR, 79 VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, buf, 1, 80 VPRBRD_USB_TIMEOUT_MS); 81 if (ret == 1) { 82 version <<= 8; 83 version = version | buf[0]; 84 } 85 86 dev_info(&interface->dev, 87 "version %x.%02x found at bus %03d address %03d\n", 88 version >> 8, version & 0xff, 89 vb->usb_dev->bus->busnum, vb->usb_dev->devnum); 90 91 ret = mfd_add_devices(&interface->dev, -1, vprbrd_devs, 92 ARRAY_SIZE(vprbrd_devs), NULL, 0, NULL); 93 if (ret != 0) { 94 dev_err(&interface->dev, "Failed to add mfd devices to core."); 95 goto error; 96 } 97 98 return 0; 99 100 error: 101 if (vb) { 102 usb_put_dev(vb->usb_dev); 103 kfree(vb); 104 } 105 106 return ret; 107 } 108 109 static void vprbrd_disconnect(struct usb_interface *interface) 110 { 111 struct vprbrd *vb = usb_get_intfdata(interface); 112 113 mfd_remove_devices(&interface->dev); 114 usb_set_intfdata(interface, NULL); 115 usb_put_dev(vb->usb_dev); 116 kfree(vb); 117 118 dev_dbg(&interface->dev, "disconnected\n"); 119 } 120 121 static struct usb_driver vprbrd_driver = { 122 .name = "viperboard", 123 .probe = vprbrd_probe, 124 .disconnect = vprbrd_disconnect, 125 .id_table = vprbrd_table, 126 }; 127 128 module_usb_driver(vprbrd_driver); 129 130 MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver"); 131 MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>"); 132 MODULE_LICENSE("GPL"); 133