projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4d80d594 UKK |
1 | /* |
| 2 | * drivers/uio/uio_pdrv.c | |
| 3 | * | |
| 4 | * Copyright (C) 2008 by Digi International Inc. | |
| 5 | * All rights reserved. | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify it | |
| 8 | * under the terms of the GNU General Public License version 2 as published by | |
| 9 | * the Free Software Foundation. | |
| 10 | */ | |
| 11 | #include <linux/platform_device.h> | |
| 12 | #include <linux/uio_driver.h> | |
| 13 | #include <linux/stringify.h> | |
| 2949ead4 | 14 | #include <linux/module.h> |
| 5a0e3ad6 | 15 | #include <linux/slab.h> |
| 4d80d594 | 16 | |
| a6fcc3a1 | 17 | #define DRIVER_NAME "uio_pdrv" |
| 4d80d594 UKK |
18 | |
| 19 | struct uio_platdata { | |
| 20 | struct uio_info *uioinfo; | |
| 21 | }; | |
| 22 | ||
| 23 | static int uio_pdrv_probe(struct platform_device *pdev) | |
| 24 | { | |
| 25 | struct uio_info *uioinfo = pdev->dev.platform_data; | |
| 26 | struct uio_platdata *pdata; | |
| 27 | struct uio_mem *uiomem; | |
| 28 | int ret = -ENODEV; | |
| 29 | int i; | |
| 30 | ||
| 31 | if (!uioinfo || !uioinfo->name || !uioinfo->version) { | |
| 32 | dev_dbg(&pdev->dev, "%s: err_uioinfo\n", __func__); | |
| 33 | goto err_uioinfo; | |
| 34 | } | |
| 35 | ||
| 36 | pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); | |
| 37 | if (!pdata) { | |
| 38 | ret = -ENOMEM; | |
| 39 | dev_dbg(&pdev->dev, "%s: err_alloc_pdata\n", __func__); | |
| 40 | goto err_alloc_pdata; | |
| 41 | } | |
| 42 | ||
| 43 | pdata->uioinfo = uioinfo; | |
| 44 | ||
| 45 | uiomem = &uioinfo->mem[0]; | |
| 46 | ||
| 47 | for (i = 0; i < pdev->num_resources; ++i) { | |
| 48 | struct resource *r = &pdev->resource[i]; | |
| 49 | ||
| 50 | if (r->flags != IORESOURCE_MEM) | |
| 51 | continue; | |
| 52 | ||
| 53 | if (uiomem >= &uioinfo->mem[MAX_UIO_MAPS]) { | |
| 54 | dev_warn(&pdev->dev, "device has more than " | |
| 55 | __stringify(MAX_UIO_MAPS) | |
| 56 | " I/O memory resources.\n"); | |
| 57 | break; | |
| 58 | } | |
| 59 | ||
| 60 | uiomem->memtype = UIO_MEM_PHYS; | |
| 61 | uiomem->addr = r->start; | |
| 28f65c11 | 62 | uiomem->size = resource_size(r); |
| 4d80d594 UKK |
63 | ++uiomem; |
| 64 | } | |
| 65 | ||
| 66 | while (uiomem < &uioinfo->mem[MAX_UIO_MAPS]) { | |
| 67 | uiomem->size = 0; | |
| 68 | ++uiomem; | |
| 69 | } | |
| 70 | ||
| 71 | pdata->uioinfo->priv = pdata; | |
| 72 | ||
| 73 | ret = uio_register_device(&pdev->dev, pdata->uioinfo); | |
| 74 | ||
| 75 | if (ret) { | |
| 76 | kfree(pdata); | |
| 77 | err_alloc_pdata: | |
| 78 | err_uioinfo: | |
| 79 | return ret; | |
| 80 | } | |
| 81 | ||
| 82 | platform_set_drvdata(pdev, pdata); | |
| 83 | ||
| 84 | return 0; | |
| 85 | } | |
| 86 | ||
| 87 | static int uio_pdrv_remove(struct platform_device *pdev) | |
| 88 | { | |
| 89 | struct uio_platdata *pdata = platform_get_drvdata(pdev); | |
| 90 | ||
| 91 | uio_unregister_device(pdata->uioinfo); | |
| 92 | ||
| 331995e7 UKK |
93 | kfree(pdata); |
| 94 | ||
| 4d80d594 UKK |
95 | return 0; |
| 96 | } | |
| 97 | ||
| 98 | static struct platform_driver uio_pdrv = { | |
| 99 | .probe = uio_pdrv_probe, | |
| 100 | .remove = uio_pdrv_remove, | |
| 101 | .driver = { | |
| 102 | .name = DRIVER_NAME, | |
| 103 | .owner = THIS_MODULE, | |
| 104 | }, | |
| 105 | }; | |
| 106 | ||
| 11e3123d | 107 | module_platform_driver(uio_pdrv); |
| 4d80d594 UKK |
108 | |
| 109 | MODULE_AUTHOR("Uwe Kleine-Koenig"); | |
| 110 | MODULE_DESCRIPTION("Userspace I/O platform driver"); | |
| 0f90927d | 111 | MODULE_LICENSE("GPL v2"); |
| 4d80d594 | 112 | MODULE_ALIAS("platform:" DRIVER_NAME); |