drivers: Introduce AIODEV subsystem
AIODEV/Aiodevice is a analog I/O framework that can be thought of as a simplified hybrid between 'hwmon' and 'IIO' subsystems of Linux kernel This commit is very heavily based on 'iodevice' framework proposal written by Sascha Hauer. Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Sascha Hauer
parent
e9add3ae57
commit
914480a542
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@ -1,6 +1,7 @@
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menu "Drivers"
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source "drivers/of/Kconfig"
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source "drivers/aiodev/Kconfig"
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source "drivers/amba/Kconfig"
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source "drivers/serial/Kconfig"
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source "drivers/net/Kconfig"
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@ -32,3 +32,4 @@ obj-$(CONFIG_FIRMWARE) += firmware/
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obj-$(CONFIG_GENERIC_PHY) += phy/
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obj-$(CONFIG_HAB) += hab/
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obj-$(CONFIG_CRYPTO_HW) += crypto/
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obj-$(CONFIG_AIODEV) += aiodev/
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@ -0,0 +1,8 @@
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#
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# Misc strange devices
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#
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menuconfig AIODEV
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bool "Analog I/O drivers"
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if AIODEV
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endif
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@ -0,0 +1,2 @@
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obj-$(CONFIG_AIODEV) += core.o
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@ -0,0 +1,148 @@
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/*
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* core.c - Code implementing core functionality of AIODEV susbsystem
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*
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* Copyright (c) 2015 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* Copyright (c) 2015 Zodiac Inflight Innovation
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* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <aiodev.h>
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#include <linux/list.h>
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#include <malloc.h>
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LIST_HEAD(aiodevices);
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EXPORT_SYMBOL(aiodevices);
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struct aiochannel *aiochannel_get_by_name(const char *name)
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{
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struct aiodevice *aiodev;
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int i;
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list_for_each_entry(aiodev, &aiodevices, list) {
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for (i = 0; i < aiodev->num_channels; i++)
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if (!strcmp(name, aiodev->channels[i]->name))
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return aiodev->channels[i];
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}
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return ERR_PTR(-ENOENT);
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}
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EXPORT_SYMBOL(aiochannel_get_by_name);
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struct aiochannel *aiochannel_get(struct device_d *dev, int index)
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{
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struct of_phandle_args spec;
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struct aiodevice *aiodev;
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int ret, chnum = 0;
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if (!dev->device_node)
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return ERR_PTR(-EINVAL);
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ret = of_parse_phandle_with_args(dev->device_node,
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"io-channels",
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"#io-channel-cells",
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index, &spec);
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if (ret)
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return ERR_PTR(ret);
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list_for_each_entry(aiodev, &aiodevices, list) {
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if (aiodev->hwdev->device_node == spec.np)
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goto found;
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}
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return ERR_PTR(-EPROBE_DEFER);
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found:
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if (spec.args_count)
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chnum = spec.args[0];
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if (chnum >= aiodev->num_channels)
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return ERR_PTR(-EINVAL);
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return aiodev->channels[chnum];
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}
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EXPORT_SYMBOL(aiochannel_get);
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int aiochannel_get_value(struct aiochannel *aiochan, int *value)
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{
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struct aiodevice *aiodev = aiochan->aiodev;
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return aiodev->read(aiochan, value);
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}
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EXPORT_SYMBOL(aiochannel_get_value);
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int aiochannel_get_index(struct aiochannel *aiochan)
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{
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return aiochan->index;
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}
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EXPORT_SYMBOL(aiochannel_get_index);
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static int aiochannel_param_get_value(struct param_d *p, void *priv)
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{
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struct aiochannel *aiochan = priv;
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return aiochannel_get_value(aiochan, &aiochan->value);
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}
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int aiodevice_register(struct aiodevice *aiodev)
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{
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int i, ret;
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if (!aiodev->name && aiodev->hwdev &&
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aiodev->hwdev->device_node) {
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aiodev->dev.id = DEVICE_ID_SINGLE;
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aiodev->name = of_alias_get(aiodev->hwdev->device_node);
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if (!aiodev->name)
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aiodev->name = aiodev->hwdev->device_node->name;
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}
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if (!aiodev->name) {
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aiodev->name = "aiodev";
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aiodev->dev.id = DEVICE_ID_DYNAMIC;
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}
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strcpy(aiodev->dev.name, aiodev->name);
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aiodev->dev.parent = aiodev->hwdev;
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ret = register_device(&aiodev->dev);
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if (ret)
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return ret;
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for (i = 0; i < aiodev->num_channels; i++) {
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struct aiochannel *aiochan = aiodev->channels[i];
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char *name;
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aiochan->index = i;
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aiochan->aiodev = aiodev;
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name = xasprintf("in_value%d_%s", i, aiochan->unit);
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dev_add_param_int(&aiodev->dev, name, NULL,
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aiochannel_param_get_value,
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&aiochan->value, "%d", aiochan);
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aiochan->name = xasprintf("%s.%s", aiodev->name, name);
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free(name);
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}
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list_add_tail(&aiodev->list, &aiodevices);
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return 0;
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}
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EXPORT_SYMBOL(aiodevice_register);
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@ -0,0 +1,59 @@
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/*
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* core.c - Code implementing core functionality of AIODEV susbsystem
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*
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* Copyright (c) 2015 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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* Copyright (c) 2015 Zodiac Inflight Innovation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __AIODEVICE_H
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#define __AIODEVICE_H
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struct aiodevice;
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struct aiochannel {
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int index;
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char *unit;
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struct aiodevice *aiodev;
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int value;
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char *name;
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};
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struct aiodevice {
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const char *name;
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int (*read)(struct aiochannel *, int *val);
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struct device_d dev;
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struct device_d *hwdev;
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struct aiochannel **channels;
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int num_channels;
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struct list_head list;
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};
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int aiodevice_register(struct aiodevice *aiodev);
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struct aiochannel *aiochannel_get(struct device_d *dev, int index);
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struct aiochannel *aiochannel_get_by_name(const char *name);
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int aiochannel_get_value(struct aiochannel *aiochan, int *value);
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int aiochannel_get_index(struct aiochannel *aiochan);
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static inline const char *aiochannel_get_unit(struct aiochannel *aiochan)
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{
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return aiochan->unit;
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}
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extern struct list_head aiodevices;
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#define for_each_aiodevice(aiodevice) list_for_each_entry(aiodevice, &aiodevices, list)
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#endif
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