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Linux/drivers/mfd/viperboard.c

  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_devices(&interface->dev, PLATFORM_DEVID_AUTO,
 97                                 vprbrd_devs, ARRAY_SIZE(vprbrd_devs), NULL, 0,
 98                                 NULL);
 99         if (ret != 0) {
100                 dev_err(&interface->dev, "Failed to add mfd devices to core.");
101                 goto error;
102         }
103 
104         return 0;
105 
106 error:
107         if (vb) {
108                 usb_put_dev(vb->usb_dev);
109                 kfree(vb);
110         }
111 
112         return ret;
113 }
114 
115 static void vprbrd_disconnect(struct usb_interface *interface)
116 {
117         struct vprbrd *vb = usb_get_intfdata(interface);
118 
119         mfd_remove_devices(&interface->dev);
120         usb_set_intfdata(interface, NULL);
121         usb_put_dev(vb->usb_dev);
122         kfree(vb);
123 
124         dev_dbg(&interface->dev, "disconnected\n");
125 }
126 
127 static struct usb_driver vprbrd_driver = {
128         .name           = "viperboard",
129         .probe          = vprbrd_probe,
130         .disconnect     = vprbrd_disconnect,
131         .id_table       = vprbrd_table,
132 };
133 
134 module_usb_driver(vprbrd_driver);
135 
136 MODULE_DESCRIPTION("Nano River Technologies viperboard mfd core driver");
137 MODULE_AUTHOR("Lars Poeschel <poeschel@lemonage.de>");
138 MODULE_LICENSE("GPL");
139 

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