forked from Minki/linux
be0db32f13
Commit c31e73121f ("base: soc: Handle custom soc information sysfs
entries") introduced custom soc attribute group in soc_device_attribute
structure but there are no users treewide. While trying to understand
the motivation and tried to use it, it was found lot of existing custom
attributes can moved to use it instead of device_create_file.
Though most of these never remove/cleanup the custom attribute as they
never call soc_device_unregister, using these custom attribute group
eliminate the need for any cleanup as the driver infrastructure will
take care of that.
Let us remove device_create_file and start using the custom attribute
group in soc_device_attribute.
Link: https://lore.kernel.org/r/20200523170859.50003-5-sudeep.holla@arm.com
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2014 Linaro Ltd.
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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#define INTEGRATOR_HDR_ID_OFFSET 0x00
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static u32 integrator_coreid;
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static const struct of_device_id integrator_cm_match[] = {
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{ .compatible = "arm,core-module-integrator", },
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{ }
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};
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static const char *integrator_arch_str(u32 id)
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{
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switch ((id >> 16) & 0xff) {
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case 0x00:
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return "ASB little-endian";
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case 0x01:
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return "AHB little-endian";
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case 0x03:
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return "AHB-Lite system bus, bi-endian";
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case 0x04:
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return "AHB";
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case 0x08:
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return "AHB system bus, ASB processor bus";
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default:
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return "Unknown";
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}
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}
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static const char *integrator_fpga_str(u32 id)
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{
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switch ((id >> 12) & 0xf) {
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case 0x01:
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return "XC4062";
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case 0x02:
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return "XC4085";
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case 0x03:
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return "XVC600";
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case 0x04:
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return "EPM7256AE (Altera PLD)";
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default:
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return "Unknown";
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}
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}
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static ssize_t
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manufacturer_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%02x\n", integrator_coreid >> 24);
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}
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static DEVICE_ATTR_RO(manufacturer);
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static ssize_t
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arch_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%s\n", integrator_arch_str(integrator_coreid));
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}
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static DEVICE_ATTR_RO(arch);
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static ssize_t
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fpga_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%s\n", integrator_fpga_str(integrator_coreid));
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}
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static DEVICE_ATTR_RO(fpga);
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static ssize_t
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build_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%02x\n", (integrator_coreid >> 4) & 0xFF);
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}
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static DEVICE_ATTR_RO(build);
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static struct attribute *integrator_attrs[] = {
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&dev_attr_manufacturer.attr,
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&dev_attr_arch.attr,
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&dev_attr_fpga.attr,
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&dev_attr_build.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(integrator);
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static int __init integrator_soc_init(void)
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{
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static struct regmap *syscon_regmap;
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struct soc_device *soc_dev;
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struct soc_device_attribute *soc_dev_attr;
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struct device_node *np;
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struct device *dev;
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u32 val;
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int ret;
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np = of_find_matching_node(NULL, integrator_cm_match);
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if (!np)
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return -ENODEV;
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syscon_regmap = syscon_node_to_regmap(np);
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if (IS_ERR(syscon_regmap))
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return PTR_ERR(syscon_regmap);
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ret = regmap_read(syscon_regmap, INTEGRATOR_HDR_ID_OFFSET,
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&val);
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if (ret)
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return -ENODEV;
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integrator_coreid = val;
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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return -ENOMEM;
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soc_dev_attr->soc_id = "Integrator";
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soc_dev_attr->machine = "Integrator";
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soc_dev_attr->family = "Versatile";
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soc_dev_attr->custom_attr_group = integrator_groups[0];
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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kfree(soc_dev_attr);
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return -ENODEV;
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}
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dev = soc_device_to_device(soc_dev);
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dev_info(dev, "Detected ARM core module:\n");
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dev_info(dev, " Manufacturer: %02x\n", (val >> 24));
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dev_info(dev, " Architecture: %s\n", integrator_arch_str(val));
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dev_info(dev, " FPGA: %s\n", integrator_fpga_str(val));
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dev_info(dev, " Build: %02x\n", (val >> 4) & 0xFF);
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dev_info(dev, " Rev: %c\n", ('A' + (val & 0x03)));
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return 0;
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}
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device_initcall(integrator_soc_init);
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