From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-pa0-x22e.google.com ([2607:f8b0:400e:c03::22e]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1awCGP-0003Fv-9r for barebox@lists.infradead.org; Fri, 29 Apr 2016 17:31:38 +0000 Received: by mail-pa0-x22e.google.com with SMTP id bt5so47807097pac.3 for ; Fri, 29 Apr 2016 10:31:16 -0700 (PDT) From: Andrey Smirnov Date: Fri, 29 Apr 2016 10:31:05 -0700 Message-Id: <1461951065-15553-1-git-send-email-andrew.smirnov@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 3/6] drivers: Introduce AIODEV subsystem To: barebox@lists.infradead.org Cc: Andrey Smirnov From: Andrey Smirnov 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 Signed-off-by: Sascha Hauer --- drivers/Kconfig | 1 + drivers/Makefile | 1 + drivers/aiodev/Kconfig | 8 +++ drivers/aiodev/Makefile | 2 + drivers/aiodev/core.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++ include/aiodev.h | 39 ++++++++++++++ 6 files changed, 186 insertions(+) create mode 100644 drivers/aiodev/Kconfig create mode 100644 drivers/aiodev/Makefile create mode 100644 drivers/aiodev/core.c create mode 100644 include/aiodev.h diff --git a/drivers/Kconfig b/drivers/Kconfig index 90ab7c1..eef68f6 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -1,6 +1,7 @@ menu "Drivers" source "drivers/of/Kconfig" +source "drivers/aiodev/Kconfig" source "drivers/amba/Kconfig" source "drivers/serial/Kconfig" source "drivers/net/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index 551b9a0..03bbc81 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -33,4 +33,5 @@ obj-$(CONFIG_GENERIC_PHY) += phy/ obj-$(CONFIG_HAB) += hab/ obj-$(CONFIG_CRYPTO_HW) += crypto/ obj-$(CONFIG_NVMEM) += nvmem/ +obj-$(CONFIG_AIODEV) += aiodev/ diff --git a/drivers/aiodev/Kconfig b/drivers/aiodev/Kconfig new file mode 100644 index 0000000..d6d4ac0 --- /dev/null +++ b/drivers/aiodev/Kconfig @@ -0,0 +1,8 @@ +# +# Misc strange devices +# +menuconfig AIODEV + bool "Analog I/O drivers" + +if AIODEV +endif diff --git a/drivers/aiodev/Makefile b/drivers/aiodev/Makefile new file mode 100644 index 0000000..806464e --- /dev/null +++ b/drivers/aiodev/Makefile @@ -0,0 +1,2 @@ + +obj-$(CONFIG_AIODEV) += core.o diff --git a/drivers/aiodev/core.c b/drivers/aiodev/core.c new file mode 100644 index 0000000..6dcb917 --- /dev/null +++ b/drivers/aiodev/core.c @@ -0,0 +1,135 @@ +#include +#include +#include +#include + +LIST_HEAD(aiodevices); +EXPORT_SYMBOL(aiodevices); + +struct aiochannel *aiochannel_get_by_name(const char *name) +{ + struct aiodevice *aiodev; + int i; + + list_for_each_entry(aiodev, &aiodevices, list) { + for (i = 0; i < aiodev->num_channels; i++) + if (!strcmp(name, aiodev->channels[i]->name)) + return aiodev->channels[i]; + } + + return ERR_PTR(-ENOENT); +} +EXPORT_SYMBOL(aiochannel_get_by_name); + +struct aiochannel *aiochannel_get(struct device_d *dev, int index) +{ + struct of_phandle_args spec; + struct aiodevice *aiodev; + int ret, chnum = 0; + + if (!dev->device_node) + return ERR_PTR(-EINVAL); + + ret = of_parse_phandle_with_args(dev->device_node, + "aio-channels", + "#aio-channel-cells", + index, &spec); + if (ret) + return ERR_PTR(ret); + + list_for_each_entry(aiodev, &aiodevices, list) { + if (aiodev->hwdev->device_node == spec.np) + goto found; + } + + return ERR_PTR(-EPROBE_DEFER); + +found: + if (spec.args_count) + chnum = spec.args[0]; + + if (chnum >= aiodev->num_channels) + return ERR_PTR(-EINVAL); + + return aiodev->channels[chnum]; +} +EXPORT_SYMBOL(aiochannel_get); + +int aiochannel_get_value(struct aiochannel *aiochan, int *value) +{ + struct aiodevice *aiodev = aiochan->aiodev; + + return aiodev->read(aiochan, value); +} +EXPORT_SYMBOL(aiochannel_get_value); + +int aiochannel_get_index(struct aiochannel *aiochan) +{ + int i; + struct aiodevice *aiodev = aiochan->aiodev; + + for (i = 0; i < aiodev->num_channels; i++) + if (aiodev->channels[i] == aiochan) + return i; + + return -ENOENT; +} +EXPORT_SYMBOL(aiochannel_get_index); + +static int aiochannel_param_get_value(struct param_d *p, void *priv) +{ + struct aiochannel *aiochan = priv; + + return aiochannel_get_value(aiochan, &aiochan->value); +} + +int aiodevice_register(struct aiodevice *aiodev) +{ + int i, ret; + + if (!aiodev->name) { + if (aiodev->hwdev && + aiodev->hwdev->device_node) { + aiodev->dev.id = DEVICE_ID_SINGLE; + + aiodev->name = of_alias_get(aiodev->hwdev->device_node); + if (!aiodev->name) + aiodev->name = aiodev->hwdev->device_node->name; + } + } + + if (!aiodev->name) { + aiodev->name = "aiodev"; + aiodev->dev.id = DEVICE_ID_DYNAMIC; + } + + strcpy(aiodev->dev.name, aiodev->name); + + aiodev->dev.parent = aiodev->hwdev; + + ret = register_device(&aiodev->dev); + if (ret) + return ret; + + for (i = 0; i < aiodev->num_channels; i++) { + struct aiochannel *aiochan = aiodev->channels[i]; + char *name; + + aiochan->aiodev = aiodev; + + name = xasprintf("in_value%d_%s", i, aiochan->unit); + + dev_add_param_int(&aiodev->dev, name, NULL, + aiochannel_param_get_value, + &aiochan->value, "%d", aiochan); + + aiochan->name = xasprintf("%s.%s", aiodev->name, name); + + free(name); + } + + list_add_tail(&aiodev->list, &aiodevices); + + return 0; +} +EXPORT_SYMBOL(aiodevice_register); diff --git a/include/aiodev.h b/include/aiodev.h new file mode 100644 index 0000000..21d8568 --- /dev/null +++ b/include/aiodev.h @@ -0,0 +1,39 @@ +#ifndef __AIODEVICE_H +#define __AIODEVICE_H + +struct aiodevice; +struct aiochannel { + char *unit; + struct aiodevice *aiodev; + + int value; + char *name; +}; + +struct aiodevice { + const char *name; + int (*read)(struct aiochannel *, int *val); + struct device_d dev; + struct device_d *hwdev; + struct aiochannel **channels; + int num_channels; + struct list_head list; +}; + +int aiodevice_register(struct aiodevice *aiodev); + +struct aiochannel *aiochannel_get(struct device_d *dev, int index); +struct aiochannel *aiochannel_get_by_name(const char *name); + +int aiochannel_get_value(struct aiochannel *aiochan, int *value); +int aiochannel_get_index(struct aiochannel *aiochan); + +static inline const char *aiochannel_get_unit(struct aiochannel *aiochan) +{ + return aiochan->unit; +} + +extern struct list_head aiodevices; +#define for_each_aiodevice(aiodevice) list_for_each_entry(aiodevice, &aiodevices, list) + +#endif -- 2.5.5 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox