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Merge pull request #1037 from notro/fw2
Add firmware driver
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| obj-$(CONFIG_BCM_VC_CMA) += vc_cma/ | ||
| obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o | ||
| obj-$(CONFIG_BCM_VCIO) += vcio.o | ||
| obj-$(CONFIG_BCM_VC_SM) += vc_sm/ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,175 @@ | ||
| /* | ||
| * Copyright (C) 2010 Broadcom | ||
| * Copyright (C) 2015 Noralf Trønnes | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| */ | ||
|
|
||
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | ||
|
|
||
| #include <linux/cdev.h> | ||
| #include <linux/device.h> | ||
| #include <linux/fs.h> | ||
| #include <linux/init.h> | ||
| #include <linux/ioctl.h> | ||
| #include <linux/module.h> | ||
| #include <linux/slab.h> | ||
| #include <linux/uaccess.h> | ||
| #include <soc/bcm2835/raspberrypi-firmware.h> | ||
|
|
||
| #define MBOX_CHAN_PROPERTY 8 | ||
|
|
||
| #define VCIO_IOC_MAGIC 100 | ||
| #define IOCTL_MBOX_PROPERTY _IOWR(VCIO_IOC_MAGIC, 0, char *) | ||
|
|
||
| static struct { | ||
| dev_t devt; | ||
| struct cdev cdev; | ||
| struct class *class; | ||
| struct rpi_firmware *fw; | ||
| } vcio; | ||
|
|
||
| static int vcio_user_property_list(void *user) | ||
| { | ||
| u32 *buf, size; | ||
| int ret; | ||
|
|
||
| /* The first 32-bit is the size of the buffer */ | ||
| if (copy_from_user(&size, user, sizeof(size))) | ||
| return -EFAULT; | ||
|
|
||
| buf = kmalloc(size, GFP_KERNEL); | ||
| if (!buf) | ||
| return -ENOMEM; | ||
|
|
||
| if (copy_from_user(buf, user, size)) { | ||
| kfree(buf); | ||
| return -EFAULT; | ||
| } | ||
|
|
||
| /* Strip off protocol encapsulation */ | ||
| ret = rpi_firmware_property_list(vcio.fw, &buf[2], size - 12); | ||
| if (ret) { | ||
| kfree(buf); | ||
| return ret; | ||
| } | ||
|
|
||
| buf[1] = RPI_FIRMWARE_STATUS_SUCCESS; | ||
| if (copy_to_user(user, buf, size)) | ||
| ret = -EFAULT; | ||
|
|
||
| kfree(buf); | ||
|
|
||
| return ret; | ||
| } | ||
|
|
||
| static int vcio_device_open(struct inode *inode, struct file *file) | ||
| { | ||
| try_module_get(THIS_MODULE); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static int vcio_device_release(struct inode *inode, struct file *file) | ||
| { | ||
| module_put(THIS_MODULE); | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| static long vcio_device_ioctl(struct file *file, unsigned int ioctl_num, | ||
| unsigned long ioctl_param) | ||
| { | ||
| switch (ioctl_num) { | ||
| case IOCTL_MBOX_PROPERTY: | ||
| return vcio_user_property_list((void *)ioctl_param); | ||
| default: | ||
| pr_err("unknown ioctl: %d\n", ioctl_num); | ||
| return -EINVAL; | ||
| } | ||
| } | ||
|
|
||
| const struct file_operations vcio_fops = { | ||
| .unlocked_ioctl = vcio_device_ioctl, | ||
| .open = vcio_device_open, | ||
| .release = vcio_device_release, | ||
| }; | ||
|
|
||
| static int __init vcio_init(void) | ||
| { | ||
| struct device_node *np; | ||
| static struct device *dev; | ||
| int ret; | ||
|
|
||
| np = of_find_compatible_node(NULL, NULL, | ||
| "raspberrypi,bcm2835-firmware"); | ||
| /* Uncomment this when we only boot with Device Tree | ||
| if (!of_device_is_available(np)) | ||
| return -ENODEV; | ||
| */ | ||
| vcio.fw = rpi_firmware_get(np); | ||
| if (!vcio.fw) | ||
| return -ENODEV; | ||
|
|
||
| ret = alloc_chrdev_region(&vcio.devt, 0, 1, "vcio"); | ||
| if (ret) { | ||
| pr_err("failed to allocate device number\n"); | ||
| return ret; | ||
| } | ||
|
|
||
| cdev_init(&vcio.cdev, &vcio_fops); | ||
| vcio.cdev.owner = THIS_MODULE; | ||
| ret = cdev_add(&vcio.cdev, vcio.devt, 1); | ||
| if (ret) { | ||
| pr_err("failed to register device\n"); | ||
| goto err_unregister_chardev; | ||
| } | ||
|
|
||
| /* | ||
| * Create sysfs entries | ||
| * 'bcm2708_vcio' is used for backwards compatibility so we don't break | ||
| * userspace. Raspian has a udev rule that changes the permissions. | ||
| */ | ||
| vcio.class = class_create(THIS_MODULE, "bcm2708_vcio"); | ||
| if (IS_ERR(vcio.class)) { | ||
| ret = PTR_ERR(vcio.class); | ||
| pr_err("failed to create class\n"); | ||
| goto err_cdev_del; | ||
| } | ||
|
|
||
| dev = device_create(vcio.class, NULL, vcio.devt, NULL, "vcio"); | ||
| if (IS_ERR(dev)) { | ||
| ret = PTR_ERR(dev); | ||
| pr_err("failed to create device\n"); | ||
| goto err_class_destroy; | ||
| } | ||
|
|
||
| return 0; | ||
|
|
||
| err_class_destroy: | ||
| class_destroy(vcio.class); | ||
| err_cdev_del: | ||
| cdev_del(&vcio.cdev); | ||
| err_unregister_chardev: | ||
| unregister_chrdev_region(vcio.devt, 1); | ||
|
|
||
| return ret; | ||
| } | ||
| module_init(vcio_init); | ||
|
|
||
| static void __exit vcio_exit(void) | ||
| { | ||
| device_destroy(vcio.class, vcio.devt); | ||
| class_destroy(vcio.class); | ||
| cdev_del(&vcio.cdev); | ||
| unregister_chrdev_region(vcio.devt, 1); | ||
| } | ||
| module_exit(vcio_exit); | ||
|
|
||
| MODULE_AUTHOR("Gray Girling"); | ||
| MODULE_AUTHOR("Noralf Trønnes"); | ||
| MODULE_DESCRIPTION("Mailbox userspace access"); | ||
| MODULE_LICENSE("GPL"); |
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