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#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/netdevice.h>

#include "tpm_common.h"
#include "tpm_header.h"

static ssize_t tpm_sysfs_trace_help(char *buf)
{
	int off = 0;
#ifdef CONFIG_MV_TPM_SYSFS_HELP
	off += sprintf(buf + off, "cat help                   - show this help\n");
	off += sprintf(buf + off, "cat trace                  - show TPM Trace configuration\n");
	off += sprintf(buf + off,
		"echo level  > trace_level  - "
		"Set TPM Global Trace level (0-none, 1-debug, 2-info, 3-warn, 4-err, 5-fatal)\n");
	off += sprintf(buf + off,
		"echo mod en > trace_module - Trace en/dis TPM module"
		"(0-db, 1-pnc_logic, 2-init, 5-proc_logic, 6-cli, 7-pnc_hw, 9-mod)\n");
#else
	printk(KERN_WARNING "%s: sysfs help is not compiled (CONFIG_MV_TPM_SYSFS_HELP)\n", __func__);
#endif
	return off;
}

static ssize_t tpm_sysfs_trace_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	int off = 0;
	const char *name = attr->attr.name;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	if (!strcmp(name, "trace"))
		off = tpm_trace_status_print();
	else
		off = tpm_sysfs_trace_help(buf);

	return off;
}

static ssize_t tpm_sysfs_trace_1_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
{
	const char *name = attr->attr.name;
	unsigned int v;
	/*unsigned long flags;*/

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	/* Read input */
	v = 0;

	sscanf(buf, "%x", &v);

	/*raw_local_irq_save(flags);*/

	if (!strcmp(name, "trace_level"))
		tpm_trace_set(v);
	else
		printk(KERN_INFO "%s: illegal operation <%s>\n", __func__, attr->attr.name);

	/*raw_local_irq_restore(flags);*/

	return len;
}

static ssize_t tpm_sysfs_trace_2_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
{
	const char *name = attr->attr.name;
	unsigned int p, v;
	/*unsigned long flags;*/

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	/* Read input */
	v = 0;
	sscanf(buf, "%d %x", &p, &v);

	/*raw_local_irq_save(flags);*/

	if (!strcmp(name, "trace_module"))
		tpm_trace_module_set(p, v);
	else
		printk(KERN_INFO "%s: illegal operation <%s>\n", __func__, attr->attr.name);

	/*raw_local_irq_restore(flags);*/

	return len;
}

static DEVICE_ATTR(trace_level, S_IWUSR, tpm_sysfs_trace_show, tpm_sysfs_trace_1_store);
static DEVICE_ATTR(trace_module, S_IWUSR, tpm_sysfs_trace_show, tpm_sysfs_trace_2_store);
static DEVICE_ATTR(trace, S_IRUSR, tpm_sysfs_trace_show, NULL);
#ifdef CONFIG_MV_TPM_SYSFS_HELP
static DEVICE_ATTR(help, S_IRUSR, tpm_sysfs_trace_show, NULL);
#endif
static struct attribute *tpm_trace_attrs[] = {
	&dev_attr_trace_level.attr,
	&dev_attr_trace_module.attr,
	&dev_attr_trace.attr,
#ifdef CONFIG_MV_TPM_SYSFS_HELP
	&dev_attr_help.attr,
#endif
	NULL
};

static struct attribute_group tpm_trace_group = {
	.name = "trace",
	.attrs = tpm_trace_attrs,
};

int tpm_sysfs_trace_init(void)
{
	int err;
	struct device *pd;

	pd = bus_find_device_by_name(&platform_bus_type, NULL, "tpm");
	if (!pd) {
		platform_device_register_simple("tpm", -1, NULL, 0);
		pd = bus_find_device_by_name(&platform_bus_type, NULL, "tpm");
	}

	if (!pd) {
		printk(KERN_ERR "%s: cannot find tpm device\n", __func__);
		pd = &platform_bus;
	}

	err = sysfs_create_group(&pd->kobj, &tpm_trace_group);
	if (err) {
		printk(KERN_INFO "sysfs group failed %d\n", err);
		goto out;
	}
out:
	return err;
}

/*module_init(xxx); */

MODULE_AUTHOR("Yuval Caduri");
MODULE_DESCRIPTION("sysfs for TPM Trace");
MODULE_LICENSE("GPL");