Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C) ST-Ericsson SA 2011
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sys_soc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/glob.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) static DEFINE_IDA(soc_ida);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /* Prototype to allow declarations of DEVICE_ATTR(<foo>) before soc_info_show */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static ssize_t soc_info_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 			     char *buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) struct soc_device {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	struct device dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	struct soc_device_attribute *attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	int soc_dev_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static struct bus_type soc_bus_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	.name  = "soc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static DEVICE_ATTR(machine,		0444, soc_info_show,  NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static DEVICE_ATTR(family,		0444, soc_info_show,  NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static DEVICE_ATTR(serial_number,	0444, soc_info_show,  NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static DEVICE_ATTR(soc_id,		0444, soc_info_show,  NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) static DEVICE_ATTR(revision,		0444, soc_info_show,  NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) struct device *soc_device_to_device(struct soc_device *soc_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	return &soc_dev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static umode_t soc_attribute_mode(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 				struct attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 				int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct device *dev = kobj_to_dev(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if ((attr == &dev_attr_machine.attr) && soc_dev->attr->machine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return attr->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	if ((attr == &dev_attr_family.attr) && soc_dev->attr->family)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		return attr->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if ((attr == &dev_attr_revision.attr) && soc_dev->attr->revision)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		return attr->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if ((attr == &dev_attr_serial_number.attr) && soc_dev->attr->serial_number)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		return attr->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if ((attr == &dev_attr_soc_id.attr) && soc_dev->attr->soc_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		return attr->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	/* Unknown or unfilled attribute */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) static ssize_t soc_info_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 			     char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	const char *output;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (attr == &dev_attr_machine)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		output = soc_dev->attr->machine;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	else if (attr == &dev_attr_family)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		output = soc_dev->attr->family;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	else if (attr == &dev_attr_revision)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		output = soc_dev->attr->revision;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	else if (attr == &dev_attr_serial_number)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		output = soc_dev->attr->serial_number;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	else if (attr == &dev_attr_soc_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		output = soc_dev->attr->soc_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	return sysfs_emit(buf, "%s\n", output);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) static struct attribute *soc_attr[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	&dev_attr_machine.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	&dev_attr_family.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	&dev_attr_serial_number.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	&dev_attr_soc_id.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	&dev_attr_revision.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) static const struct attribute_group soc_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	.attrs = soc_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	.is_visible = soc_attribute_mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static void soc_release(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	kfree(soc_dev->dev.groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	kfree(soc_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static struct soc_device_attribute *early_soc_dev_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	struct soc_device *soc_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	const struct attribute_group **soc_attr_groups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	if (!soc_bus_type.p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		if (early_soc_dev_attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 			return ERR_PTR(-EBUSY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		early_soc_dev_attr = soc_dev_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	if (!soc_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		goto out1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	soc_attr_groups = kcalloc(3, sizeof(*soc_attr_groups), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (!soc_attr_groups) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		goto out2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	soc_attr_groups[0] = &soc_attr_group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	soc_attr_groups[1] = soc_dev_attr->custom_attr_group;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	/* Fetch a unique (reclaimable) SOC ID. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 		goto out3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	soc_dev->soc_dev_num = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	soc_dev->attr = soc_dev_attr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	soc_dev->dev.bus = &soc_bus_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	soc_dev->dev.groups = soc_attr_groups;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	soc_dev->dev.release = soc_release;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	ret = device_register(&soc_dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		put_device(&soc_dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return soc_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) out3:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	kfree(soc_attr_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) out2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	kfree(soc_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) out1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	return ERR_PTR(ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) EXPORT_SYMBOL_GPL(soc_device_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) /* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) void soc_device_unregister(struct soc_device *soc_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	device_unregister(&soc_dev->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	early_soc_dev_attr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) EXPORT_SYMBOL_GPL(soc_device_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) static int __init soc_bus_register(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	ret = bus_register(&soc_bus_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (early_soc_dev_attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		return PTR_ERR(soc_device_register(early_soc_dev_attr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) core_initcall(soc_bus_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static int soc_device_match_attr(const struct soc_device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 				 const struct soc_device_attribute *match)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (match->machine &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	    (!attr->machine || !glob_match(match->machine, attr->machine)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	if (match->family &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	    (!attr->family || !glob_match(match->family, attr->family)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (match->revision &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	    (!attr->revision || !glob_match(match->revision, attr->revision)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	if (match->soc_id &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	    (!attr->soc_id || !glob_match(match->soc_id, attr->soc_id)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static int soc_device_match_one(struct device *dev, void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	return soc_device_match_attr(soc_dev->attr, arg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)  * soc_device_match - identify the SoC in the machine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)  * @matches: zero-terminated array of possible matches
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)  * returns the first matching entry of the argument array, or NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)  * if none of them match.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)  * This function is meant as a helper in place of of_match_node()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)  * in cases where either no device tree is available or the information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)  * in a device node is insufficient to identify a particular variant
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * by its compatible strings or other properties. For new devices,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  * the DT binding should always provide unique compatible strings
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)  * that allow the use of of_match_node() instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)  * The calling function can use the .data entry of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)  * soc_device_attribute to pass a structure or function pointer for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)  * each entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) const struct soc_device_attribute *soc_device_match(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	const struct soc_device_attribute *matches)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (!matches)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	while (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		if (!(matches->machine || matches->family ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		      matches->revision || matches->soc_id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		ret = bus_for_each_dev(&soc_bus_type, NULL, (void *)matches,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 				       soc_device_match_one);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		if (ret < 0 && early_soc_dev_attr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			ret = soc_device_match_attr(early_soc_dev_attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 						    matches);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			matches++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 			return matches;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) EXPORT_SYMBOL_GPL(soc_device_match);