linux/drivers/of/module.c
Linus Torvalds 06f054b1fe Devicetree for v6.10:
DT Bindings:
 - Convert samsung,exynos5-dp, atmel,lcdc, aspeed,ast2400-wdt bindings to
   schemas
 
 - Add bindings for Allwinner H616 NMI controller, Renesas r8a779g0 irqc,
   Renesas R-Car V4M TMU and CMT timers, Freescale S32G3 linflexuart, and
   Mediatek MT7988 XHCI
 
 - Add 'reg' constraints on DSI and SPI display panels
 
 - More dropping of unnecessary quotes in schemas
 
 - Use full paths rather than relative paths in schema $refs
 
 - Drop redundant storing of phandle for reserved memory
 
 DT Core:
 - Use scope based cleanups for kfree() and of_node_put()
 
 - Track interrupt-map and power-supplies for fw_devlink
 
 - Add buffer overflow check in of_modalias()
 
 - Add and use __of_prop_free() helper for freeing struct property
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Merge tag 'devicetree-for-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux

Pull devicetree updates from Rob Herring:
 "DT Bindings:

   - Convert samsung,exynos5-dp, atmel,lcdc, aspeed,ast2400-wdt bindings
     to schemas

   - Add bindings for Allwinner H616 NMI controller, Renesas r8a779g0
     irqc, Renesas R-Car V4M TMU and CMT timers, Freescale S32G3
     linflexuart, and Mediatek MT7988 XHCI

   - Add 'reg' constraints on DSI and SPI display panels

   - More dropping of unnecessary quotes in schemas

   - Use full paths rather than relative paths in schema $refs

   - Drop redundant storing of phandle for reserved memory

  DT Core:

   - Use scope based cleanups for kfree() and of_node_put()

   - Track interrupt-map and power-supplies for fw_devlink

   - Add buffer overflow check in of_modalias()

   - Add and use __of_prop_free() helper for freeing struct property"

* tag 'devicetree-for-6.10' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux: (25 commits)
  of: property: Add fw_devlink support for interrupt-map property
  dt-bindings: display: panel: constrain 'reg' in DSI panels
  dt-bindings: display: panel: constrain 'reg' in SPI panels
  dt-bindings: display: samsung,ams495qa01: add missing SPI properties ref
  dt-bindings: Use full path to other schemas
  dt-bindings: PCI: qcom,pcie-sm8350: Drop redundant 'oneOf' sub-schema
  of: module: add buffer overflow check in of_modalias()
  dt-bindings: PCI: microchip: increase number of items in ranges property
  dt-bindings: Drop unnecessary quotes on keys
  dt-bindings: interrupt-controller: mediatek,mt6577-sysirq: Drop unnecessary quotes
  of: property: Use scope based cleanup on port_node
  of: reserved_mem: Remove the use of phandle from the reserved_mem APIs
  of: property: fw_devlink: Add support for "power-supplies" binding
  dt-bindings: watchdog: aspeed,ast2400-wdt: Convert to DT schema
  dt-bindings: irq: sun7i-nmi: Add binding for the H616 NMI controller
  dt-bindings: interrupt-controller: renesas,irqc: Add r8a779g0 support
  dt-bindings: timer: renesas,tmu: Add R-Car V4M support
  dt-bindings: timer: renesas,cmt: Add R-Car V4M support
  of: Use scope based of_node_put() cleanups
  of: Use scope based kfree() cleanups
  ...
2024-05-17 17:27:49 -07:00

84 lines
1.6 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Linux kernel module helpers.
*/
#include <linux/of.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
ssize_t of_modalias(const struct device_node *np, char *str, ssize_t len)
{
const char *compat;
char *c;
struct property *p;
ssize_t csize;
ssize_t tsize;
/*
* Prevent a kernel oops in vsnprintf() -- it only allows passing a
* NULL ptr when the length is also 0. Also filter out the negative
* lengths...
*/
if ((len > 0 && !str) || len < 0)
return -EINVAL;
/* Name & Type */
/* %p eats all alphanum characters, so %c must be used here */
csize = snprintf(str, len, "of:N%pOFn%c%s", np, 'T',
of_node_get_device_type(np));
tsize = csize;
if (csize >= len)
csize = len > 0 ? len - 1 : 0;
len -= csize;
str += csize;
of_property_for_each_string(np, "compatible", p, compat) {
csize = strlen(compat) + 1;
tsize += csize;
if (csize >= len)
continue;
csize = snprintf(str, len, "C%s", compat);
for (c = str; c; ) {
c = strchr(c, ' ');
if (c)
*c++ = '_';
}
len -= csize;
str += csize;
}
return tsize;
}
int of_request_module(const struct device_node *np)
{
char *str;
ssize_t size;
int ret;
if (!np)
return -ENODEV;
size = of_modalias(np, NULL, 0);
if (size < 0)
return size;
/* Reserve an additional byte for the trailing '\0' */
size++;
str = kmalloc(size, GFP_KERNEL);
if (!str)
return -ENOMEM;
of_modalias(np, str, size);
str[size - 1] = '\0';
ret = request_module(str);
kfree(str);
return ret;
}
EXPORT_SYMBOL_GPL(of_request_module);