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// SPDX-License-Identifier: GPL-2.0+
// Copyright 2018 IBM Corp.
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#define DEVICE_NAME "aspeed-bmc-misc"
struct aspeed_bmc_ctrl {
const char *name;
u32 offset;
u32 mask;
u32 shift;
struct regmap *map;
struct kobj_attribute attr;
};
struct aspeed_bmc_misc {
struct device *dev;
struct regmap *map;
struct aspeed_bmc_ctrl *ctrls;
int nr_ctrls;
};
static int aspeed_bmc_misc_parse_dt_child(struct device_node *child,
struct aspeed_bmc_ctrl *ctrl)
{
int rc;
/* Example child:
*
* ilpc2ahb {
* offset = <0x80>;
* bit-mask = <0x1>;
* bit-shift = <6>;
* label = "foo";
* }
*/
if (of_property_read_string(child, "label", &ctrl->name))
ctrl->name = child->name;
rc = of_property_read_u32(child, "offset", &ctrl->offset);
if (rc < 0)
return rc;
rc = of_property_read_u32(child, "bit-mask", &ctrl->mask);
if (rc < 0)
return rc;
rc = of_property_read_u32(child, "bit-shift", &ctrl->shift);
if (rc < 0)
return rc;
ctrl->mask <<= ctrl->shift;
return 0;
}
static int aspeed_bmc_misc_parse_dt(struct aspeed_bmc_misc *bmc,
struct device_node *parent)
{
struct aspeed_bmc_ctrl *ctrl;
struct device_node *child;
int rc;
bmc->nr_ctrls = of_get_child_count(parent);
bmc->ctrls = devm_kcalloc(bmc->dev, bmc->nr_ctrls, sizeof(*bmc->ctrls),
GFP_KERNEL);
if (!bmc->ctrls)
return -ENOMEM;
ctrl = bmc->ctrls;
for_each_child_of_node(parent, child) {
rc = aspeed_bmc_misc_parse_dt_child(child, ctrl++);
if (rc < 0) {
of_node_put(child);
return rc;
}
}
return 0;
}
static ssize_t aspeed_bmc_misc_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct aspeed_bmc_ctrl *ctrl;
unsigned int val;
int rc;
ctrl = container_of(attr, struct aspeed_bmc_ctrl, attr);
rc = regmap_read(ctrl->map, ctrl->offset, &val);
if (rc)
return rc;
val &= ctrl->mask;
val >>= ctrl->shift;
return sprintf(buf, "%u\n", val);
}
static ssize_t aspeed_bmc_misc_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
struct aspeed_bmc_ctrl *ctrl;
long val;
int rc;
rc = kstrtol(buf, 0, &val);
if (rc)
return rc;
ctrl = container_of(attr, struct aspeed_bmc_ctrl, attr);
val <<= ctrl->shift;
rc = regmap_update_bits(ctrl->map, ctrl->offset, ctrl->mask, val);
return rc < 0 ? rc : count;
}
static int aspeed_bmc_misc_add_sysfs_attr(struct aspeed_bmc_misc *bmc,
struct aspeed_bmc_ctrl *ctrl)
{
ctrl->map = bmc->map;
sysfs_attr_init(&ctrl->attr.attr);
ctrl->attr.attr.name = ctrl->name;
ctrl->attr.attr.mode = 0664;
ctrl->attr.show = aspeed_bmc_misc_show;
ctrl->attr.store = aspeed_bmc_misc_store;
return sysfs_create_file(&bmc->dev->kobj, &ctrl->attr.attr);
}
static int aspeed_bmc_misc_populate_sysfs(struct aspeed_bmc_misc *bmc)
{
int rc;
int i;
for (i = 0; i < bmc->nr_ctrls; i++) {
rc = aspeed_bmc_misc_add_sysfs_attr(bmc, &bmc->ctrls[i]);
if (rc < 0)
return rc;
}
return 0;
}
static int aspeed_bmc_misc_probe(struct platform_device *pdev)
{
struct aspeed_bmc_misc *bmc;
int rc;
bmc = devm_kzalloc(&pdev->dev, sizeof(*bmc), GFP_KERNEL);
if (!bmc)
return -ENOMEM;
bmc->dev = &pdev->dev;
bmc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
if (IS_ERR(bmc->map))
return PTR_ERR(bmc->map);
rc = aspeed_bmc_misc_parse_dt(bmc, pdev->dev.of_node);
if (rc < 0)
return rc;
return aspeed_bmc_misc_populate_sysfs(bmc);
}
static const struct of_device_id aspeed_bmc_misc_match[] = {
{ .compatible = "aspeed,bmc-misc" },
{ },
};
static struct platform_driver aspeed_bmc_misc = {
.driver = {
.name = DEVICE_NAME,
.of_match_table = aspeed_bmc_misc_match,
},
.probe = aspeed_bmc_misc_probe,
};
module_platform_driver(aspeed_bmc_misc);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Andrew Jeffery <andrew@aj.id.au>");
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