123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <asm/errno.h>
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#include <asm/of_device.h>
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ssize_t of_device_get_modalias(struct of_device *ofdev,
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char *str, ssize_t len)
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{
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const char *compat;
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int cplen, i;
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ssize_t tsize, csize, repend;
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/* Name & Type */
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csize = snprintf(str, len, "of:N%sT%s",
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ofdev->node->name, ofdev->node->type);
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/* Get compatible property if any */
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compat = of_get_property(ofdev->node, "compatible", &cplen);
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if (!compat)
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return csize;
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/* Find true end (we tolerate multiple \0 at the end */
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for (i=(cplen-1); i>=0 && !compat[i]; i--)
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cplen--;
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if (!cplen)
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return csize;
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cplen++;
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/* Check space (need cplen+1 chars including final \0) */
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tsize = csize + cplen;
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repend = tsize;
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if (csize>=len) /* @ the limit, all is already filled */
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return tsize;
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if (tsize>=len) { /* limit compat list */
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cplen = len-csize-1;
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repend = len;
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}
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/* Copy and do char replacement */
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memcpy(&str[csize+1], compat, cplen);
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for (i=csize; i<repend; i++) {
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char c = str[i];
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if (c=='\0')
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str[i] = 'C';
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else if (c==' ')
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str[i] = '_';
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}
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return tsize;
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}
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int of_device_uevent(struct device *dev,
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char **envp, int num_envp, char *buffer, int buffer_size)
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{
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struct of_device *ofdev;
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const char *compat;
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int i = 0, length = 0, seen = 0, cplen, sl;
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if (!dev)
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return -ENODEV;
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ofdev = to_of_device(dev);
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"OF_NAME=%s", ofdev->node->name))
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return -ENOMEM;
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"OF_TYPE=%s", ofdev->node->type))
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return -ENOMEM;
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/* Since the compatible field can contain pretty much anything
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* it's not really legal to split it out with commas. We split it
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* up using a number of environment variables instead. */
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compat = of_get_property(ofdev->node, "compatible", &cplen);
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while (compat && *compat && cplen > 0) {
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"OF_COMPATIBLE_%d=%s", seen, compat))
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return -ENOMEM;
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sl = strlen (compat) + 1;
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compat += sl;
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cplen -= sl;
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seen++;
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}
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"OF_COMPATIBLE_N=%d", seen))
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return -ENOMEM;
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/* modalias is trickier, we add it in 2 steps */
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"MODALIAS="))
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return -ENOMEM;
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sl = of_device_get_modalias(ofdev, &buffer[length-1],
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buffer_size-length);
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if (sl >= (buffer_size-length))
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return -ENOMEM;
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length += sl;
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envp[i] = NULL;
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return 0;
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}
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EXPORT_SYMBOL(of_device_uevent);
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EXPORT_SYMBOL(of_device_get_modalias);
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