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 const struct mfd_cell vprbrd_devs[] = { 41 { 42 .name = "viperboard-gpio", 43 }, 44 { 45 .name = "viperboard-i2c", 46 }, 47 { 48 .name = "viperboard-adc", 49 }, 50 }; 51 52 static int vprbrd_probe(struct usb_interface *interface, 53 const struct usb_device_id *id) 54 { 55 struct vprbrd *vb; 56 57 u16 version = 0; 58 int pipe, ret; 59 60 /* allocate memory for our device state and initialize it */ 61 vb = kzalloc(sizeof(*vb), GFP_KERNEL); 62 if (vb == NULL) { 63 dev_err(&interface->dev, "Out of memory\n"); 64 return -ENOMEM; 65 } 66 67 mutex_init(&vb->lock); 68 69 vb->usb_dev = usb_get_dev(interface_to_usbdev(interface)); 70 71 /* save our data pointer in this interface device */ 72 usb_set_intfdata(interface, vb); 73 dev_set_drvdata(&vb->pdev.dev, vb); 74 75 /* get version information, major first, minor then */ 76 pipe = usb_rcvctrlpipe(vb->usb_dev, 0); 77 ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MAJOR, 78 VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1, 79 VPRBRD_USB_TIMEOUT_MS); 80 if (ret == 1) 81 version = vb->buf[0]; 82 83 ret = usb_control_msg(vb->usb_dev, pipe, VPRBRD_USB_REQUEST_MINOR, 84 VPRBRD_USB_TYPE_IN, 0x0000, 0x0000, vb->buf, 1, 85 VPRBRD_USB_TIMEOUT_MS); 86 if (ret == 1) { 87 version <<= 8; 88 version = version | vb->buf[0]; 89 } 90 91 dev_info(&interface->dev, 92 "version %x.%02x found at bus %03d address %03d\n", 93 version >> 8, version & 0xff, 94 vb->usb_dev->bus->busnum, vb->usb_dev->devnum); 95 96 ret = mfd_add_hotplug_devices(&interface->dev, vprbrd_devs, 97 ARRAY_SIZE(vprbrd_devs)); 98 if (ret != 0) { 99 dev_err(&interface->dev, "Failed to add mfd devices to core."); 100 goto error; 101 } 102 103 return 0; 104 105 error: 106 if (vb) { 107 usb_put_dev(vb->usb_dev); 108 kfree(vb); 109 } 110 111 return ret; 112 } 113 114 static void vprbrd_disconnect(struct usb_interface *interface) 115 { 116 struct vprbrd *vb = usb_get_intfdata(interface); 117 118 mfd_remove_devices(&interface->dev); 119 usb_set_intfdata(interface, NULL); 120 usb_put_dev(vb->usb_dev); 121 kfree(vb); 122 123 dev_dbg(&interface->dev, "disconnected\n"); 124 } 125 126 static struct usb_driver vprbrd_driver = { 127 .name = "viperboard", 128 .probe = vprbrd_probe, 129 .disconnect = vprbrd_disconnect, 130 .id_table = vprbrd_table, 131 }; 132 133 module_usb_driver(vprbrd_driver); 134 135 MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver"); 136 MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>"); 137 MODULE_LICENSE("GPL"); 138