1568 lines
40 KiB
C
1568 lines
40 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generic Counter interface
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* Copyright (C) 2018 William Breathitt Gray
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*/
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#include <linux/counter.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include <linux/fs.h>
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#include <linux/gfp.h>
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#include <linux/idr.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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const char *const counter_count_direction_str[2] = {
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[COUNTER_COUNT_DIRECTION_FORWARD] = "forward",
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[COUNTER_COUNT_DIRECTION_BACKWARD] = "backward"
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};
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EXPORT_SYMBOL_GPL(counter_count_direction_str);
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const char *const counter_count_mode_str[4] = {
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[COUNTER_COUNT_MODE_NORMAL] = "normal",
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[COUNTER_COUNT_MODE_RANGE_LIMIT] = "range limit",
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[COUNTER_COUNT_MODE_NON_RECYCLE] = "non-recycle",
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[COUNTER_COUNT_MODE_MODULO_N] = "modulo-n"
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};
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EXPORT_SYMBOL_GPL(counter_count_mode_str);
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ssize_t counter_signal_enum_read(struct counter_device *counter,
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struct counter_signal *signal, void *priv,
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char *buf)
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{
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const struct counter_signal_enum_ext *const e = priv;
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int err;
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size_t index;
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if (!e->get)
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return -EINVAL;
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err = e->get(counter, signal, &index);
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if (err)
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return err;
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if (index >= e->num_items)
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return -EINVAL;
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return sprintf(buf, "%s\n", e->items[index]);
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}
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EXPORT_SYMBOL_GPL(counter_signal_enum_read);
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ssize_t counter_signal_enum_write(struct counter_device *counter,
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struct counter_signal *signal, void *priv,
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const char *buf, size_t len)
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{
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const struct counter_signal_enum_ext *const e = priv;
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ssize_t index;
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int err;
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if (!e->set)
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return -EINVAL;
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index = __sysfs_match_string(e->items, e->num_items, buf);
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if (index < 0)
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return index;
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err = e->set(counter, signal, index);
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if (err)
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return err;
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return len;
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}
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EXPORT_SYMBOL_GPL(counter_signal_enum_write);
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ssize_t counter_signal_enum_available_read(struct counter_device *counter,
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struct counter_signal *signal,
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void *priv, char *buf)
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{
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const struct counter_signal_enum_ext *const e = priv;
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size_t i;
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size_t len = 0;
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if (!e->num_items)
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return 0;
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for (i = 0; i < e->num_items; i++)
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len += sprintf(buf + len, "%s\n", e->items[i]);
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return len;
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}
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EXPORT_SYMBOL_GPL(counter_signal_enum_available_read);
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ssize_t counter_count_enum_read(struct counter_device *counter,
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struct counter_count *count, void *priv,
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char *buf)
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{
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const struct counter_count_enum_ext *const e = priv;
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int err;
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size_t index;
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if (!e->get)
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return -EINVAL;
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err = e->get(counter, count, &index);
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if (err)
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return err;
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if (index >= e->num_items)
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return -EINVAL;
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return sprintf(buf, "%s\n", e->items[index]);
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}
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EXPORT_SYMBOL_GPL(counter_count_enum_read);
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ssize_t counter_count_enum_write(struct counter_device *counter,
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struct counter_count *count, void *priv,
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const char *buf, size_t len)
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{
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const struct counter_count_enum_ext *const e = priv;
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ssize_t index;
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int err;
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if (!e->set)
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return -EINVAL;
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index = __sysfs_match_string(e->items, e->num_items, buf);
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if (index < 0)
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return index;
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err = e->set(counter, count, index);
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if (err)
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return err;
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return len;
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}
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EXPORT_SYMBOL_GPL(counter_count_enum_write);
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ssize_t counter_count_enum_available_read(struct counter_device *counter,
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struct counter_count *count,
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void *priv, char *buf)
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{
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const struct counter_count_enum_ext *const e = priv;
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size_t i;
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size_t len = 0;
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if (!e->num_items)
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return 0;
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for (i = 0; i < e->num_items; i++)
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len += sprintf(buf + len, "%s\n", e->items[i]);
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return len;
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}
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EXPORT_SYMBOL_GPL(counter_count_enum_available_read);
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ssize_t counter_device_enum_read(struct counter_device *counter, void *priv,
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char *buf)
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{
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const struct counter_device_enum_ext *const e = priv;
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int err;
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size_t index;
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if (!e->get)
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return -EINVAL;
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err = e->get(counter, &index);
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if (err)
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return err;
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if (index >= e->num_items)
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return -EINVAL;
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return sprintf(buf, "%s\n", e->items[index]);
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}
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EXPORT_SYMBOL_GPL(counter_device_enum_read);
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ssize_t counter_device_enum_write(struct counter_device *counter, void *priv,
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const char *buf, size_t len)
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{
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const struct counter_device_enum_ext *const e = priv;
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ssize_t index;
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int err;
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if (!e->set)
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return -EINVAL;
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index = __sysfs_match_string(e->items, e->num_items, buf);
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if (index < 0)
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return index;
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err = e->set(counter, index);
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if (err)
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return err;
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return len;
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}
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EXPORT_SYMBOL_GPL(counter_device_enum_write);
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ssize_t counter_device_enum_available_read(struct counter_device *counter,
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void *priv, char *buf)
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{
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const struct counter_device_enum_ext *const e = priv;
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size_t i;
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size_t len = 0;
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if (!e->num_items)
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return 0;
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for (i = 0; i < e->num_items; i++)
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len += sprintf(buf + len, "%s\n", e->items[i]);
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return len;
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}
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EXPORT_SYMBOL_GPL(counter_device_enum_available_read);
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static const char *const counter_signal_level_str[] = {
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[COUNTER_SIGNAL_LEVEL_LOW] = "low",
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[COUNTER_SIGNAL_LEVEL_HIGH] = "high"
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};
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/**
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* counter_signal_read_value_set - set counter_signal_read_value data
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* @val: counter_signal_read_value structure to set
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* @type: property Signal data represents
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* @data: Signal data
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*
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* This function sets an opaque counter_signal_read_value structure with the
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* provided Signal data.
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*/
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void counter_signal_read_value_set(struct counter_signal_read_value *const val,
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const enum counter_signal_value_type type,
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void *const data)
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{
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if (type == COUNTER_SIGNAL_LEVEL)
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val->len = sprintf(val->buf, "%s\n",
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counter_signal_level_str[*(enum counter_signal_level *)data]);
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else
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val->len = 0;
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}
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EXPORT_SYMBOL_GPL(counter_signal_read_value_set);
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/**
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* counter_count_read_value_set - set counter_count_read_value data
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* @val: counter_count_read_value structure to set
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* @type: property Count data represents
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* @data: Count data
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*
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* This function sets an opaque counter_count_read_value structure with the
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* provided Count data.
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*/
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void counter_count_read_value_set(struct counter_count_read_value *const val,
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const enum counter_count_value_type type,
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void *const data)
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{
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switch (type) {
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case COUNTER_COUNT_POSITION:
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val->len = sprintf(val->buf, "%lu\n", *(unsigned long *)data);
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break;
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default:
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val->len = 0;
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}
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}
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EXPORT_SYMBOL_GPL(counter_count_read_value_set);
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/**
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* counter_count_write_value_get - get counter_count_write_value data
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* @data: Count data
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* @type: property Count data represents
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* @val: counter_count_write_value structure containing data
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*
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* This function extracts Count data from the provided opaque
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* counter_count_write_value structure and stores it at the address provided by
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* @data.
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*
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* RETURNS:
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* 0 on success, negative error number on failure.
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*/
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int counter_count_write_value_get(void *const data,
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const enum counter_count_value_type type,
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const struct counter_count_write_value *const val)
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{
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int err;
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switch (type) {
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case COUNTER_COUNT_POSITION:
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err = kstrtoul(val->buf, 0, data);
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if (err)
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return err;
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break;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(counter_count_write_value_get);
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struct counter_attr_parm {
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struct counter_device_attr_group *group;
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const char *prefix;
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const char *name;
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ssize_t (*show)(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t (*store)(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len);
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void *component;
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};
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struct counter_device_attr {
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struct device_attribute dev_attr;
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struct list_head l;
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void *component;
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};
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static int counter_attribute_create(const struct counter_attr_parm *const parm)
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{
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struct counter_device_attr *counter_attr;
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struct device_attribute *dev_attr;
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int err;
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struct list_head *const attr_list = &parm->group->attr_list;
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/* Allocate a Counter device attribute */
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counter_attr = kzalloc(sizeof(*counter_attr), GFP_KERNEL);
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if (!counter_attr)
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return -ENOMEM;
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dev_attr = &counter_attr->dev_attr;
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sysfs_attr_init(&dev_attr->attr);
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/* Configure device attribute */
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dev_attr->attr.name = kasprintf(GFP_KERNEL, "%s%s", parm->prefix,
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parm->name);
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if (!dev_attr->attr.name) {
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err = -ENOMEM;
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goto err_free_counter_attr;
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}
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if (parm->show) {
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dev_attr->attr.mode |= 0444;
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dev_attr->show = parm->show;
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}
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if (parm->store) {
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dev_attr->attr.mode |= 0200;
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dev_attr->store = parm->store;
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}
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/* Store associated Counter component with attribute */
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counter_attr->component = parm->component;
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/* Keep track of the attribute for later cleanup */
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list_add(&counter_attr->l, attr_list);
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parm->group->num_attr++;
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return 0;
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err_free_counter_attr:
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kfree(counter_attr);
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return err;
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}
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#define to_counter_attr(_dev_attr) \
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container_of(_dev_attr, struct counter_device_attr, dev_attr)
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struct counter_signal_unit {
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struct counter_signal *signal;
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};
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static ssize_t counter_signal_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct counter_device *const counter = dev_get_drvdata(dev);
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const struct counter_device_attr *const devattr = to_counter_attr(attr);
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const struct counter_signal_unit *const component = devattr->component;
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struct counter_signal *const signal = component->signal;
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int err;
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struct counter_signal_read_value val = { .buf = buf };
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err = counter->ops->signal_read(counter, signal, &val);
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if (err)
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return err;
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return val.len;
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}
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struct counter_name_unit {
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const char *name;
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};
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static ssize_t counter_device_attr_name_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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const struct counter_name_unit *const comp = to_counter_attr(attr)->component;
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return sprintf(buf, "%s\n", comp->name);
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}
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static int counter_name_attribute_create(
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struct counter_device_attr_group *const group,
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const char *const name)
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{
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struct counter_name_unit *name_comp;
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struct counter_attr_parm parm;
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int err;
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/* Skip if no name */
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if (!name)
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return 0;
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/* Allocate name attribute component */
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name_comp = kmalloc(sizeof(*name_comp), GFP_KERNEL);
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if (!name_comp)
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return -ENOMEM;
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name_comp->name = name;
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/* Allocate Signal name attribute */
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parm.group = group;
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parm.prefix = "";
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parm.name = "name";
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parm.show = counter_device_attr_name_show;
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parm.store = NULL;
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parm.component = name_comp;
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err = counter_attribute_create(&parm);
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if (err)
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goto err_free_name_comp;
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return 0;
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err_free_name_comp:
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kfree(name_comp);
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return err;
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}
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struct counter_signal_ext_unit {
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struct counter_signal *signal;
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const struct counter_signal_ext *ext;
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};
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static ssize_t counter_signal_ext_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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const struct counter_device_attr *const devattr = to_counter_attr(attr);
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const struct counter_signal_ext_unit *const comp = devattr->component;
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const struct counter_signal_ext *const ext = comp->ext;
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return ext->read(dev_get_drvdata(dev), comp->signal, ext->priv, buf);
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}
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static ssize_t counter_signal_ext_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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const struct counter_device_attr *const devattr = to_counter_attr(attr);
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const struct counter_signal_ext_unit *const comp = devattr->component;
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const struct counter_signal_ext *const ext = comp->ext;
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return ext->write(dev_get_drvdata(dev), comp->signal, ext->priv, buf,
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len);
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}
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static void counter_device_attr_list_free(struct list_head *attr_list)
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{
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struct counter_device_attr *p, *n;
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list_for_each_entry_safe(p, n, attr_list, l) {
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/* free attribute name and associated component memory */
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kfree(p->dev_attr.attr.name);
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kfree(p->component);
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list_del(&p->l);
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kfree(p);
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}
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}
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static int counter_signal_ext_register(
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struct counter_device_attr_group *const group,
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struct counter_signal *const signal)
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{
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const size_t num_ext = signal->num_ext;
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size_t i;
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const struct counter_signal_ext *ext;
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struct counter_signal_ext_unit *signal_ext_comp;
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struct counter_attr_parm parm;
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int err;
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/* Create an attribute for each extension */
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for (i = 0 ; i < num_ext; i++) {
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ext = signal->ext + i;
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/* Allocate signal_ext attribute component */
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signal_ext_comp = kmalloc(sizeof(*signal_ext_comp), GFP_KERNEL);
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if (!signal_ext_comp) {
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err = -ENOMEM;
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goto err_free_attr_list;
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}
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signal_ext_comp->signal = signal;
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signal_ext_comp->ext = ext;
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/* Allocate a Counter device attribute */
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parm.group = group;
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parm.prefix = "";
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parm.name = ext->name;
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parm.show = (ext->read) ? counter_signal_ext_show : NULL;
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parm.store = (ext->write) ? counter_signal_ext_store : NULL;
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parm.component = signal_ext_comp;
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err = counter_attribute_create(&parm);
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if (err) {
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kfree(signal_ext_comp);
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goto err_free_attr_list;
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}
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}
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return 0;
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err_free_attr_list:
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counter_device_attr_list_free(&group->attr_list);
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return err;
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}
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static int counter_signal_attributes_create(
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struct counter_device_attr_group *const group,
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const struct counter_device *const counter,
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struct counter_signal *const signal)
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{
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struct counter_signal_unit *signal_comp;
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struct counter_attr_parm parm;
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int err;
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/* Allocate Signal attribute component */
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signal_comp = kmalloc(sizeof(*signal_comp), GFP_KERNEL);
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if (!signal_comp)
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return -ENOMEM;
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signal_comp->signal = signal;
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/* Create main Signal attribute */
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parm.group = group;
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parm.prefix = "";
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parm.name = "signal";
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parm.show = (counter->ops->signal_read) ? counter_signal_show : NULL;
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parm.store = NULL;
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parm.component = signal_comp;
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err = counter_attribute_create(&parm);
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if (err) {
|
|
kfree(signal_comp);
|
|
return err;
|
|
}
|
|
|
|
/* Create Signal name attribute */
|
|
err = counter_name_attribute_create(group, signal->name);
|
|
if (err)
|
|
goto err_free_attr_list;
|
|
|
|
/* Register Signal extension attributes */
|
|
err = counter_signal_ext_register(group, signal);
|
|
if (err)
|
|
goto err_free_attr_list;
|
|
|
|
return 0;
|
|
|
|
err_free_attr_list:
|
|
counter_device_attr_list_free(&group->attr_list);
|
|
return err;
|
|
}
|
|
|
|
static int counter_signals_register(
|
|
struct counter_device_attr_group *const groups_list,
|
|
const struct counter_device *const counter)
|
|
{
|
|
const size_t num_signals = counter->num_signals;
|
|
size_t i;
|
|
struct counter_signal *signal;
|
|
const char *name;
|
|
int err;
|
|
|
|
/* Register each Signal */
|
|
for (i = 0; i < num_signals; i++) {
|
|
signal = counter->signals + i;
|
|
|
|
/* Generate Signal attribute directory name */
|
|
name = kasprintf(GFP_KERNEL, "signal%d", signal->id);
|
|
if (!name) {
|
|
err = -ENOMEM;
|
|
goto err_free_attr_groups;
|
|
}
|
|
groups_list[i].attr_group.name = name;
|
|
|
|
/* Create all attributes associated with Signal */
|
|
err = counter_signal_attributes_create(groups_list + i, counter,
|
|
signal);
|
|
if (err)
|
|
goto err_free_attr_groups;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_attr_groups:
|
|
do {
|
|
kfree(groups_list[i].attr_group.name);
|
|
counter_device_attr_list_free(&groups_list[i].attr_list);
|
|
} while (i--);
|
|
return err;
|
|
}
|
|
|
|
static const char *const counter_synapse_action_str[] = {
|
|
[COUNTER_SYNAPSE_ACTION_NONE] = "none",
|
|
[COUNTER_SYNAPSE_ACTION_RISING_EDGE] = "rising edge",
|
|
[COUNTER_SYNAPSE_ACTION_FALLING_EDGE] = "falling edge",
|
|
[COUNTER_SYNAPSE_ACTION_BOTH_EDGES] = "both edges"
|
|
};
|
|
|
|
struct counter_action_unit {
|
|
struct counter_synapse *synapse;
|
|
struct counter_count *count;
|
|
};
|
|
|
|
static ssize_t counter_action_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
int err;
|
|
struct counter_device *const counter = dev_get_drvdata(dev);
|
|
const struct counter_action_unit *const component = devattr->component;
|
|
struct counter_count *const count = component->count;
|
|
struct counter_synapse *const synapse = component->synapse;
|
|
size_t action_index;
|
|
enum counter_synapse_action action;
|
|
|
|
err = counter->ops->action_get(counter, count, synapse, &action_index);
|
|
if (err)
|
|
return err;
|
|
|
|
synapse->action = action_index;
|
|
|
|
action = synapse->actions_list[action_index];
|
|
return sprintf(buf, "%s\n", counter_synapse_action_str[action]);
|
|
}
|
|
|
|
static ssize_t counter_action_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_action_unit *const component = devattr->component;
|
|
struct counter_synapse *const synapse = component->synapse;
|
|
size_t action_index;
|
|
const size_t num_actions = synapse->num_actions;
|
|
enum counter_synapse_action action;
|
|
int err;
|
|
struct counter_device *const counter = dev_get_drvdata(dev);
|
|
struct counter_count *const count = component->count;
|
|
|
|
/* Find requested action mode */
|
|
for (action_index = 0; action_index < num_actions; action_index++) {
|
|
action = synapse->actions_list[action_index];
|
|
if (sysfs_streq(buf, counter_synapse_action_str[action]))
|
|
break;
|
|
}
|
|
/* If requested action mode not found */
|
|
if (action_index >= num_actions)
|
|
return -EINVAL;
|
|
|
|
err = counter->ops->action_set(counter, count, synapse, action_index);
|
|
if (err)
|
|
return err;
|
|
|
|
synapse->action = action_index;
|
|
|
|
return len;
|
|
}
|
|
|
|
struct counter_action_avail_unit {
|
|
const enum counter_synapse_action *actions_list;
|
|
size_t num_actions;
|
|
};
|
|
|
|
static ssize_t counter_synapse_action_available_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_action_avail_unit *const component = devattr->component;
|
|
size_t i;
|
|
enum counter_synapse_action action;
|
|
ssize_t len = 0;
|
|
|
|
for (i = 0; i < component->num_actions; i++) {
|
|
action = component->actions_list[i];
|
|
len += sprintf(buf + len, "%s\n",
|
|
counter_synapse_action_str[action]);
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static int counter_synapses_register(
|
|
struct counter_device_attr_group *const group,
|
|
const struct counter_device *const counter,
|
|
struct counter_count *const count, const char *const count_attr_name)
|
|
{
|
|
size_t i;
|
|
struct counter_synapse *synapse;
|
|
const char *prefix;
|
|
struct counter_action_unit *action_comp;
|
|
struct counter_attr_parm parm;
|
|
int err;
|
|
struct counter_action_avail_unit *avail_comp;
|
|
|
|
/* Register each Synapse */
|
|
for (i = 0; i < count->num_synapses; i++) {
|
|
synapse = count->synapses + i;
|
|
|
|
/* Generate attribute prefix */
|
|
prefix = kasprintf(GFP_KERNEL, "signal%d_",
|
|
synapse->signal->id);
|
|
if (!prefix) {
|
|
err = -ENOMEM;
|
|
goto err_free_attr_list;
|
|
}
|
|
|
|
/* Allocate action attribute component */
|
|
action_comp = kmalloc(sizeof(*action_comp), GFP_KERNEL);
|
|
if (!action_comp) {
|
|
err = -ENOMEM;
|
|
goto err_free_prefix;
|
|
}
|
|
action_comp->synapse = synapse;
|
|
action_comp->count = count;
|
|
|
|
/* Create action attribute */
|
|
parm.group = group;
|
|
parm.prefix = prefix;
|
|
parm.name = "action";
|
|
parm.show = (counter->ops->action_get) ? counter_action_show : NULL;
|
|
parm.store = (counter->ops->action_set) ? counter_action_store : NULL;
|
|
parm.component = action_comp;
|
|
err = counter_attribute_create(&parm);
|
|
if (err) {
|
|
kfree(action_comp);
|
|
goto err_free_prefix;
|
|
}
|
|
|
|
/* Allocate action available attribute component */
|
|
avail_comp = kmalloc(sizeof(*avail_comp), GFP_KERNEL);
|
|
if (!avail_comp) {
|
|
err = -ENOMEM;
|
|
goto err_free_prefix;
|
|
}
|
|
avail_comp->actions_list = synapse->actions_list;
|
|
avail_comp->num_actions = synapse->num_actions;
|
|
|
|
/* Create action_available attribute */
|
|
parm.group = group;
|
|
parm.prefix = prefix;
|
|
parm.name = "action_available";
|
|
parm.show = counter_synapse_action_available_show;
|
|
parm.store = NULL;
|
|
parm.component = avail_comp;
|
|
err = counter_attribute_create(&parm);
|
|
if (err) {
|
|
kfree(avail_comp);
|
|
goto err_free_prefix;
|
|
}
|
|
|
|
kfree(prefix);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_prefix:
|
|
kfree(prefix);
|
|
err_free_attr_list:
|
|
counter_device_attr_list_free(&group->attr_list);
|
|
return err;
|
|
}
|
|
|
|
struct counter_count_unit {
|
|
struct counter_count *count;
|
|
};
|
|
|
|
static ssize_t counter_count_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct counter_device *const counter = dev_get_drvdata(dev);
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_count_unit *const component = devattr->component;
|
|
struct counter_count *const count = component->count;
|
|
int err;
|
|
struct counter_count_read_value val = { .buf = buf };
|
|
|
|
err = counter->ops->count_read(counter, count, &val);
|
|
if (err)
|
|
return err;
|
|
|
|
return val.len;
|
|
}
|
|
|
|
static ssize_t counter_count_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
struct counter_device *const counter = dev_get_drvdata(dev);
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_count_unit *const component = devattr->component;
|
|
struct counter_count *const count = component->count;
|
|
int err;
|
|
struct counter_count_write_value val = { .buf = buf };
|
|
|
|
err = counter->ops->count_write(counter, count, &val);
|
|
if (err)
|
|
return err;
|
|
|
|
return len;
|
|
}
|
|
|
|
static const char *const counter_count_function_str[] = {
|
|
[COUNTER_COUNT_FUNCTION_INCREASE] = "increase",
|
|
[COUNTER_COUNT_FUNCTION_DECREASE] = "decrease",
|
|
[COUNTER_COUNT_FUNCTION_PULSE_DIRECTION] = "pulse-direction",
|
|
[COUNTER_COUNT_FUNCTION_QUADRATURE_X1_A] = "quadrature x1 a",
|
|
[COUNTER_COUNT_FUNCTION_QUADRATURE_X1_B] = "quadrature x1 b",
|
|
[COUNTER_COUNT_FUNCTION_QUADRATURE_X2_A] = "quadrature x2 a",
|
|
[COUNTER_COUNT_FUNCTION_QUADRATURE_X2_B] = "quadrature x2 b",
|
|
[COUNTER_COUNT_FUNCTION_QUADRATURE_X4] = "quadrature x4"
|
|
};
|
|
|
|
static ssize_t counter_function_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
int err;
|
|
struct counter_device *const counter = dev_get_drvdata(dev);
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_count_unit *const component = devattr->component;
|
|
struct counter_count *const count = component->count;
|
|
size_t func_index;
|
|
enum counter_count_function function;
|
|
|
|
err = counter->ops->function_get(counter, count, &func_index);
|
|
if (err)
|
|
return err;
|
|
|
|
count->function = func_index;
|
|
|
|
function = count->functions_list[func_index];
|
|
return sprintf(buf, "%s\n", counter_count_function_str[function]);
|
|
}
|
|
|
|
static ssize_t counter_function_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_count_unit *const component = devattr->component;
|
|
struct counter_count *const count = component->count;
|
|
const size_t num_functions = count->num_functions;
|
|
size_t func_index;
|
|
enum counter_count_function function;
|
|
int err;
|
|
struct counter_device *const counter = dev_get_drvdata(dev);
|
|
|
|
/* Find requested Count function mode */
|
|
for (func_index = 0; func_index < num_functions; func_index++) {
|
|
function = count->functions_list[func_index];
|
|
if (sysfs_streq(buf, counter_count_function_str[function]))
|
|
break;
|
|
}
|
|
/* Return error if requested Count function mode not found */
|
|
if (func_index >= num_functions)
|
|
return -EINVAL;
|
|
|
|
err = counter->ops->function_set(counter, count, func_index);
|
|
if (err)
|
|
return err;
|
|
|
|
count->function = func_index;
|
|
|
|
return len;
|
|
}
|
|
|
|
struct counter_count_ext_unit {
|
|
struct counter_count *count;
|
|
const struct counter_count_ext *ext;
|
|
};
|
|
|
|
static ssize_t counter_count_ext_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_count_ext_unit *const comp = devattr->component;
|
|
const struct counter_count_ext *const ext = comp->ext;
|
|
|
|
return ext->read(dev_get_drvdata(dev), comp->count, ext->priv, buf);
|
|
}
|
|
|
|
static ssize_t counter_count_ext_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_count_ext_unit *const comp = devattr->component;
|
|
const struct counter_count_ext *const ext = comp->ext;
|
|
|
|
return ext->write(dev_get_drvdata(dev), comp->count, ext->priv, buf,
|
|
len);
|
|
}
|
|
|
|
static int counter_count_ext_register(
|
|
struct counter_device_attr_group *const group,
|
|
struct counter_count *const count)
|
|
{
|
|
size_t i;
|
|
const struct counter_count_ext *ext;
|
|
struct counter_count_ext_unit *count_ext_comp;
|
|
struct counter_attr_parm parm;
|
|
int err;
|
|
|
|
/* Create an attribute for each extension */
|
|
for (i = 0 ; i < count->num_ext; i++) {
|
|
ext = count->ext + i;
|
|
|
|
/* Allocate count_ext attribute component */
|
|
count_ext_comp = kmalloc(sizeof(*count_ext_comp), GFP_KERNEL);
|
|
if (!count_ext_comp) {
|
|
err = -ENOMEM;
|
|
goto err_free_attr_list;
|
|
}
|
|
count_ext_comp->count = count;
|
|
count_ext_comp->ext = ext;
|
|
|
|
/* Allocate count_ext attribute */
|
|
parm.group = group;
|
|
parm.prefix = "";
|
|
parm.name = ext->name;
|
|
parm.show = (ext->read) ? counter_count_ext_show : NULL;
|
|
parm.store = (ext->write) ? counter_count_ext_store : NULL;
|
|
parm.component = count_ext_comp;
|
|
err = counter_attribute_create(&parm);
|
|
if (err) {
|
|
kfree(count_ext_comp);
|
|
goto err_free_attr_list;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_attr_list:
|
|
counter_device_attr_list_free(&group->attr_list);
|
|
return err;
|
|
}
|
|
|
|
struct counter_func_avail_unit {
|
|
const enum counter_count_function *functions_list;
|
|
size_t num_functions;
|
|
};
|
|
|
|
static ssize_t counter_count_function_available_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_func_avail_unit *const component = devattr->component;
|
|
const enum counter_count_function *const func_list = component->functions_list;
|
|
const size_t num_functions = component->num_functions;
|
|
size_t i;
|
|
enum counter_count_function function;
|
|
ssize_t len = 0;
|
|
|
|
for (i = 0; i < num_functions; i++) {
|
|
function = func_list[i];
|
|
len += sprintf(buf + len, "%s\n",
|
|
counter_count_function_str[function]);
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static int counter_count_attributes_create(
|
|
struct counter_device_attr_group *const group,
|
|
const struct counter_device *const counter,
|
|
struct counter_count *const count)
|
|
{
|
|
struct counter_count_unit *count_comp;
|
|
struct counter_attr_parm parm;
|
|
int err;
|
|
struct counter_count_unit *func_comp;
|
|
struct counter_func_avail_unit *avail_comp;
|
|
|
|
/* Allocate count attribute component */
|
|
count_comp = kmalloc(sizeof(*count_comp), GFP_KERNEL);
|
|
if (!count_comp)
|
|
return -ENOMEM;
|
|
count_comp->count = count;
|
|
|
|
/* Create main Count attribute */
|
|
parm.group = group;
|
|
parm.prefix = "";
|
|
parm.name = "count";
|
|
parm.show = (counter->ops->count_read) ? counter_count_show : NULL;
|
|
parm.store = (counter->ops->count_write) ? counter_count_store : NULL;
|
|
parm.component = count_comp;
|
|
err = counter_attribute_create(&parm);
|
|
if (err) {
|
|
kfree(count_comp);
|
|
return err;
|
|
}
|
|
|
|
/* Allocate function attribute component */
|
|
func_comp = kmalloc(sizeof(*func_comp), GFP_KERNEL);
|
|
if (!func_comp) {
|
|
err = -ENOMEM;
|
|
goto err_free_attr_list;
|
|
}
|
|
func_comp->count = count;
|
|
|
|
/* Create Count function attribute */
|
|
parm.group = group;
|
|
parm.prefix = "";
|
|
parm.name = "function";
|
|
parm.show = (counter->ops->function_get) ? counter_function_show : NULL;
|
|
parm.store = (counter->ops->function_set) ? counter_function_store : NULL;
|
|
parm.component = func_comp;
|
|
err = counter_attribute_create(&parm);
|
|
if (err) {
|
|
kfree(func_comp);
|
|
goto err_free_attr_list;
|
|
}
|
|
|
|
/* Allocate function available attribute component */
|
|
avail_comp = kmalloc(sizeof(*avail_comp), GFP_KERNEL);
|
|
if (!avail_comp) {
|
|
err = -ENOMEM;
|
|
goto err_free_attr_list;
|
|
}
|
|
avail_comp->functions_list = count->functions_list;
|
|
avail_comp->num_functions = count->num_functions;
|
|
|
|
/* Create Count function_available attribute */
|
|
parm.group = group;
|
|
parm.prefix = "";
|
|
parm.name = "function_available";
|
|
parm.show = counter_count_function_available_show;
|
|
parm.store = NULL;
|
|
parm.component = avail_comp;
|
|
err = counter_attribute_create(&parm);
|
|
if (err) {
|
|
kfree(avail_comp);
|
|
goto err_free_attr_list;
|
|
}
|
|
|
|
/* Create Count name attribute */
|
|
err = counter_name_attribute_create(group, count->name);
|
|
if (err)
|
|
goto err_free_attr_list;
|
|
|
|
/* Register Count extension attributes */
|
|
err = counter_count_ext_register(group, count);
|
|
if (err)
|
|
goto err_free_attr_list;
|
|
|
|
return 0;
|
|
|
|
err_free_attr_list:
|
|
counter_device_attr_list_free(&group->attr_list);
|
|
return err;
|
|
}
|
|
|
|
static int counter_counts_register(
|
|
struct counter_device_attr_group *const groups_list,
|
|
const struct counter_device *const counter)
|
|
{
|
|
size_t i;
|
|
struct counter_count *count;
|
|
const char *name;
|
|
int err;
|
|
|
|
/* Register each Count */
|
|
for (i = 0; i < counter->num_counts; i++) {
|
|
count = counter->counts + i;
|
|
|
|
/* Generate Count attribute directory name */
|
|
name = kasprintf(GFP_KERNEL, "count%d", count->id);
|
|
if (!name) {
|
|
err = -ENOMEM;
|
|
goto err_free_attr_groups;
|
|
}
|
|
groups_list[i].attr_group.name = name;
|
|
|
|
/* Register the Synapses associated with each Count */
|
|
err = counter_synapses_register(groups_list + i, counter, count,
|
|
name);
|
|
if (err)
|
|
goto err_free_attr_groups;
|
|
|
|
/* Create all attributes associated with Count */
|
|
err = counter_count_attributes_create(groups_list + i, counter,
|
|
count);
|
|
if (err)
|
|
goto err_free_attr_groups;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_attr_groups:
|
|
do {
|
|
kfree(groups_list[i].attr_group.name);
|
|
counter_device_attr_list_free(&groups_list[i].attr_list);
|
|
} while (i--);
|
|
return err;
|
|
}
|
|
|
|
struct counter_size_unit {
|
|
size_t size;
|
|
};
|
|
|
|
static ssize_t counter_device_attr_size_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
const struct counter_size_unit *const comp = to_counter_attr(attr)->component;
|
|
|
|
return sprintf(buf, "%zu\n", comp->size);
|
|
}
|
|
|
|
static int counter_size_attribute_create(
|
|
struct counter_device_attr_group *const group,
|
|
const size_t size, const char *const name)
|
|
{
|
|
struct counter_size_unit *size_comp;
|
|
struct counter_attr_parm parm;
|
|
int err;
|
|
|
|
/* Allocate size attribute component */
|
|
size_comp = kmalloc(sizeof(*size_comp), GFP_KERNEL);
|
|
if (!size_comp)
|
|
return -ENOMEM;
|
|
size_comp->size = size;
|
|
|
|
parm.group = group;
|
|
parm.prefix = "";
|
|
parm.name = name;
|
|
parm.show = counter_device_attr_size_show;
|
|
parm.store = NULL;
|
|
parm.component = size_comp;
|
|
err = counter_attribute_create(&parm);
|
|
if (err)
|
|
goto err_free_size_comp;
|
|
|
|
return 0;
|
|
|
|
err_free_size_comp:
|
|
kfree(size_comp);
|
|
return err;
|
|
}
|
|
|
|
struct counter_ext_unit {
|
|
const struct counter_device_ext *ext;
|
|
};
|
|
|
|
static ssize_t counter_device_ext_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_ext_unit *const component = devattr->component;
|
|
const struct counter_device_ext *const ext = component->ext;
|
|
|
|
return ext->read(dev_get_drvdata(dev), ext->priv, buf);
|
|
}
|
|
|
|
static ssize_t counter_device_ext_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t len)
|
|
{
|
|
const struct counter_device_attr *const devattr = to_counter_attr(attr);
|
|
const struct counter_ext_unit *const component = devattr->component;
|
|
const struct counter_device_ext *const ext = component->ext;
|
|
|
|
return ext->write(dev_get_drvdata(dev), ext->priv, buf, len);
|
|
}
|
|
|
|
static int counter_device_ext_register(
|
|
struct counter_device_attr_group *const group,
|
|
struct counter_device *const counter)
|
|
{
|
|
size_t i;
|
|
struct counter_ext_unit *ext_comp;
|
|
struct counter_attr_parm parm;
|
|
int err;
|
|
|
|
/* Create an attribute for each extension */
|
|
for (i = 0 ; i < counter->num_ext; i++) {
|
|
/* Allocate extension attribute component */
|
|
ext_comp = kmalloc(sizeof(*ext_comp), GFP_KERNEL);
|
|
if (!ext_comp) {
|
|
err = -ENOMEM;
|
|
goto err_free_attr_list;
|
|
}
|
|
|
|
ext_comp->ext = counter->ext + i;
|
|
|
|
/* Allocate extension attribute */
|
|
parm.group = group;
|
|
parm.prefix = "";
|
|
parm.name = counter->ext[i].name;
|
|
parm.show = (counter->ext[i].read) ? counter_device_ext_show : NULL;
|
|
parm.store = (counter->ext[i].write) ? counter_device_ext_store : NULL;
|
|
parm.component = ext_comp;
|
|
err = counter_attribute_create(&parm);
|
|
if (err) {
|
|
kfree(ext_comp);
|
|
goto err_free_attr_list;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_attr_list:
|
|
counter_device_attr_list_free(&group->attr_list);
|
|
return err;
|
|
}
|
|
|
|
static int counter_global_attr_register(
|
|
struct counter_device_attr_group *const group,
|
|
struct counter_device *const counter)
|
|
{
|
|
int err;
|
|
|
|
/* Create name attribute */
|
|
err = counter_name_attribute_create(group, counter->name);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Create num_counts attribute */
|
|
err = counter_size_attribute_create(group, counter->num_counts,
|
|
"num_counts");
|
|
if (err)
|
|
goto err_free_attr_list;
|
|
|
|
/* Create num_signals attribute */
|
|
err = counter_size_attribute_create(group, counter->num_signals,
|
|
"num_signals");
|
|
if (err)
|
|
goto err_free_attr_list;
|
|
|
|
/* Register Counter device extension attributes */
|
|
err = counter_device_ext_register(group, counter);
|
|
if (err)
|
|
goto err_free_attr_list;
|
|
|
|
return 0;
|
|
|
|
err_free_attr_list:
|
|
counter_device_attr_list_free(&group->attr_list);
|
|
return err;
|
|
}
|
|
|
|
static void counter_device_groups_list_free(
|
|
struct counter_device_attr_group *const groups_list,
|
|
const size_t num_groups)
|
|
{
|
|
struct counter_device_attr_group *group;
|
|
size_t i;
|
|
|
|
/* loop through all attribute groups (signals, counts, global, etc.) */
|
|
for (i = 0; i < num_groups; i++) {
|
|
group = groups_list + i;
|
|
|
|
/* free all attribute group and associated attributes memory */
|
|
kfree(group->attr_group.name);
|
|
kfree(group->attr_group.attrs);
|
|
counter_device_attr_list_free(&group->attr_list);
|
|
}
|
|
|
|
kfree(groups_list);
|
|
}
|
|
|
|
static int counter_device_groups_list_prepare(
|
|
struct counter_device *const counter)
|
|
{
|
|
const size_t total_num_groups =
|
|
counter->num_signals + counter->num_counts + 1;
|
|
struct counter_device_attr_group *groups_list;
|
|
size_t i;
|
|
int err;
|
|
size_t num_groups = 0;
|
|
|
|
/* Allocate space for attribute groups (signals, counts, and ext) */
|
|
groups_list = kcalloc(total_num_groups, sizeof(*groups_list),
|
|
GFP_KERNEL);
|
|
if (!groups_list)
|
|
return -ENOMEM;
|
|
|
|
/* Initialize attribute lists */
|
|
for (i = 0; i < total_num_groups; i++)
|
|
INIT_LIST_HEAD(&groups_list[i].attr_list);
|
|
|
|
/* Register Signals */
|
|
err = counter_signals_register(groups_list, counter);
|
|
if (err)
|
|
goto err_free_groups_list;
|
|
num_groups += counter->num_signals;
|
|
|
|
/* Register Counts and respective Synapses */
|
|
err = counter_counts_register(groups_list + num_groups, counter);
|
|
if (err)
|
|
goto err_free_groups_list;
|
|
num_groups += counter->num_counts;
|
|
|
|
/* Register Counter global attributes */
|
|
err = counter_global_attr_register(groups_list + num_groups, counter);
|
|
if (err)
|
|
goto err_free_groups_list;
|
|
num_groups++;
|
|
|
|
/* Store groups_list in device_state */
|
|
counter->device_state->groups_list = groups_list;
|
|
counter->device_state->num_groups = num_groups;
|
|
|
|
return 0;
|
|
|
|
err_free_groups_list:
|
|
counter_device_groups_list_free(groups_list, num_groups);
|
|
return err;
|
|
}
|
|
|
|
static int counter_device_groups_prepare(
|
|
struct counter_device_state *const device_state)
|
|
{
|
|
size_t i, j;
|
|
struct counter_device_attr_group *group;
|
|
int err;
|
|
struct counter_device_attr *p;
|
|
|
|
/* Allocate attribute groups for association with device */
|
|
device_state->groups = kcalloc(device_state->num_groups + 1,
|
|
sizeof(*device_state->groups),
|
|
GFP_KERNEL);
|
|
if (!device_state->groups)
|
|
return -ENOMEM;
|
|
|
|
/* Prepare each group of attributes for association */
|
|
for (i = 0; i < device_state->num_groups; i++) {
|
|
group = device_state->groups_list + i;
|
|
|
|
/* Allocate space for attribute pointers in attribute group */
|
|
group->attr_group.attrs = kcalloc(group->num_attr + 1,
|
|
sizeof(*group->attr_group.attrs), GFP_KERNEL);
|
|
if (!group->attr_group.attrs) {
|
|
err = -ENOMEM;
|
|
goto err_free_groups;
|
|
}
|
|
|
|
/* Add attribute pointers to attribute group */
|
|
j = 0;
|
|
list_for_each_entry(p, &group->attr_list, l)
|
|
group->attr_group.attrs[j++] = &p->dev_attr.attr;
|
|
|
|
/* Group attributes in attribute group */
|
|
device_state->groups[i] = &group->attr_group;
|
|
}
|
|
/* Associate attributes with device */
|
|
device_state->dev.groups = device_state->groups;
|
|
|
|
return 0;
|
|
|
|
err_free_groups:
|
|
do {
|
|
group = device_state->groups_list + i;
|
|
kfree(group->attr_group.attrs);
|
|
group->attr_group.attrs = NULL;
|
|
} while (i--);
|
|
kfree(device_state->groups);
|
|
return err;
|
|
}
|
|
|
|
/* Provides a unique ID for each counter device */
|
|
static DEFINE_IDA(counter_ida);
|
|
|
|
static void counter_device_release(struct device *dev)
|
|
{
|
|
struct counter_device *const counter = dev_get_drvdata(dev);
|
|
struct counter_device_state *const device_state = counter->device_state;
|
|
|
|
kfree(device_state->groups);
|
|
counter_device_groups_list_free(device_state->groups_list,
|
|
device_state->num_groups);
|
|
ida_simple_remove(&counter_ida, device_state->id);
|
|
kfree(device_state);
|
|
}
|
|
|
|
static struct device_type counter_device_type = {
|
|
.name = "counter_device",
|
|
.release = counter_device_release
|
|
};
|
|
|
|
static struct bus_type counter_bus_type = {
|
|
.name = "counter"
|
|
};
|
|
|
|
/**
|
|
* counter_register - register Counter to the system
|
|
* @counter: pointer to Counter to register
|
|
*
|
|
* This function registers a Counter to the system. A sysfs "counter" directory
|
|
* will be created and populated with sysfs attributes correlating with the
|
|
* Counter Signals, Synapses, and Counts respectively.
|
|
*/
|
|
int counter_register(struct counter_device *const counter)
|
|
{
|
|
struct counter_device_state *device_state;
|
|
int err;
|
|
|
|
/* Allocate internal state container for Counter device */
|
|
device_state = kzalloc(sizeof(*device_state), GFP_KERNEL);
|
|
if (!device_state)
|
|
return -ENOMEM;
|
|
counter->device_state = device_state;
|
|
|
|
/* Acquire unique ID */
|
|
device_state->id = ida_simple_get(&counter_ida, 0, 0, GFP_KERNEL);
|
|
if (device_state->id < 0) {
|
|
err = device_state->id;
|
|
goto err_free_device_state;
|
|
}
|
|
|
|
/* Configure device structure for Counter */
|
|
device_state->dev.type = &counter_device_type;
|
|
device_state->dev.bus = &counter_bus_type;
|
|
if (counter->parent) {
|
|
device_state->dev.parent = counter->parent;
|
|
device_state->dev.of_node = counter->parent->of_node;
|
|
}
|
|
dev_set_name(&device_state->dev, "counter%d", device_state->id);
|
|
device_initialize(&device_state->dev);
|
|
dev_set_drvdata(&device_state->dev, counter);
|
|
|
|
/* Prepare device attributes */
|
|
err = counter_device_groups_list_prepare(counter);
|
|
if (err)
|
|
goto err_free_id;
|
|
|
|
/* Organize device attributes to groups and match to device */
|
|
err = counter_device_groups_prepare(device_state);
|
|
if (err)
|
|
goto err_free_groups_list;
|
|
|
|
/* Add device to system */
|
|
err = device_add(&device_state->dev);
|
|
if (err)
|
|
goto err_free_groups;
|
|
|
|
return 0;
|
|
|
|
err_free_groups:
|
|
kfree(device_state->groups);
|
|
err_free_groups_list:
|
|
counter_device_groups_list_free(device_state->groups_list,
|
|
device_state->num_groups);
|
|
err_free_id:
|
|
ida_simple_remove(&counter_ida, device_state->id);
|
|
err_free_device_state:
|
|
kfree(device_state);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(counter_register);
|
|
|
|
/**
|
|
* counter_unregister - unregister Counter from the system
|
|
* @counter: pointer to Counter to unregister
|
|
*
|
|
* The Counter is unregistered from the system; all allocated memory is freed.
|
|
*/
|
|
void counter_unregister(struct counter_device *const counter)
|
|
{
|
|
if (counter)
|
|
device_del(&counter->device_state->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(counter_unregister);
|
|
|
|
static void devm_counter_unreg(struct device *dev, void *res)
|
|
{
|
|
counter_unregister(*(struct counter_device **)res);
|
|
}
|
|
|
|
/**
|
|
* devm_counter_register - Resource-managed counter_register
|
|
* @dev: device to allocate counter_device for
|
|
* @counter: pointer to Counter to register
|
|
*
|
|
* Managed counter_register. The Counter registered with this function is
|
|
* automatically unregistered on driver detach. This function calls
|
|
* counter_register internally. Refer to that function for more information.
|
|
*
|
|
* If an Counter registered with this function needs to be unregistered
|
|
* separately, devm_counter_unregister must be used.
|
|
*
|
|
* RETURNS:
|
|
* 0 on success, negative error number on failure.
|
|
*/
|
|
int devm_counter_register(struct device *dev,
|
|
struct counter_device *const counter)
|
|
{
|
|
struct counter_device **ptr;
|
|
int ret;
|
|
|
|
ptr = devres_alloc(devm_counter_unreg, sizeof(*ptr), GFP_KERNEL);
|
|
if (!ptr)
|
|
return -ENOMEM;
|
|
|
|
ret = counter_register(counter);
|
|
if (!ret) {
|
|
*ptr = counter;
|
|
devres_add(dev, ptr);
|
|
} else {
|
|
devres_free(ptr);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_counter_register);
|
|
|
|
static int devm_counter_match(struct device *dev, void *res, void *data)
|
|
{
|
|
struct counter_device **r = res;
|
|
|
|
if (!r || !*r) {
|
|
WARN_ON(!r || !*r);
|
|
return 0;
|
|
}
|
|
|
|
return *r == data;
|
|
}
|
|
|
|
/**
|
|
* devm_counter_unregister - Resource-managed counter_unregister
|
|
* @dev: device this counter_device belongs to
|
|
* @counter: pointer to Counter associated with the device
|
|
*
|
|
* Unregister Counter registered with devm_counter_register.
|
|
*/
|
|
void devm_counter_unregister(struct device *dev,
|
|
struct counter_device *const counter)
|
|
{
|
|
int rc;
|
|
|
|
rc = devres_release(dev, devm_counter_unreg, devm_counter_match,
|
|
counter);
|
|
WARN_ON(rc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(devm_counter_unregister);
|
|
|
|
static int __init counter_init(void)
|
|
{
|
|
return bus_register(&counter_bus_type);
|
|
}
|
|
|
|
static void __exit counter_exit(void)
|
|
{
|
|
bus_unregister(&counter_bus_type);
|
|
}
|
|
|
|
subsys_initcall(counter_init);
|
|
module_exit(counter_exit);
|
|
|
|
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
|
|
MODULE_DESCRIPTION("Generic Counter interface");
|
|
MODULE_LICENSE("GPL v2");
|