From patchwork Thu Jul 19 09:57:52 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eugen Hristev X-Patchwork-Id: 946148 X-Patchwork-Delegate: trini@ti.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=lists.denx.de (client-ip=81.169.180.215; helo=lists.denx.de; envelope-from=u-boot-bounces@lists.denx.de; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=microchip.com Received: from lists.denx.de (dione.denx.de [81.169.180.215]) by ozlabs.org (Postfix) with ESMTP id 41WVB70cjcz9s21 for ; Thu, 19 Jul 2018 20:09:51 +1000 (AEST) Received: by lists.denx.de (Postfix, from userid 105) id 29753C21E38; Thu, 19 Jul 2018 10:07:51 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lists.denx.de X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=none autolearn=unavailable autolearn_force=no version=3.4.0 Received: from lists.denx.de (localhost [IPv6:::1]) by lists.denx.de (Postfix) with ESMTP id A0972C21F20; Thu, 19 Jul 2018 10:03:04 +0000 (UTC) Received: by lists.denx.de (Postfix, from userid 105) id 3759BC21EF2; Thu, 19 Jul 2018 10:02:46 +0000 (UTC) Received: from esa6.microchip.iphmx.com (esa6.microchip.iphmx.com [216.71.154.253]) by lists.denx.de (Postfix) with ESMTPS id 4ADDFC21E7F for ; Thu, 19 Jul 2018 10:02:41 +0000 (UTC) X-IronPort-AV: E=Sophos;i="5.51,374,1526367600"; d="scan'208";a="13758112" Received: from smtpout.microchip.com (HELO email.microchip.com) ([198.175.253.82]) by esa6.microchip.iphmx.com with ESMTP/TLS/DHE-RSA-AES256-SHA; 19 Jul 2018 03:02:40 -0700 Received: from eh-station.mchp-main.com (10.10.76.4) by chn-sv-exch07.mchp-main.com (10.10.76.108) with Microsoft SMTP Server id 14.3.352.0; Thu, 19 Jul 2018 03:02:40 -0700 From: Eugen Hristev To: Date: Thu, 19 Jul 2018 12:57:52 +0300 Message-ID: <1531994288-19423-5-git-send-email-eugen.hristev@microchip.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1531994288-19423-1-git-send-email-eugen.hristev@microchip.com> References: <1531994288-19423-1-git-send-email-eugen.hristev@microchip.com> MIME-Version: 1.0 Cc: maxime.ripard@bootlin.com, Maxime Ripard , nicolas.ferre@microchip.com Subject: [U-Boot] [PATCH 04/20] W1-EEPROM: Add an W1-EEPROM uclass for 1 wire EEPROMs X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.18 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" From: Maxime Ripard We might want to access data stored onto one wire EEPROMs. Create a framework to provide a consistent API. Signed-off-by: Maxime Ripard [eugen.hristev@microchip.com: reworked patch] Signed-off-by: Eugen Hristev --- drivers/Kconfig | 2 ++ drivers/Makefile | 1 + drivers/w1-eeprom/Kconfig | 17 +++++++++++ drivers/w1-eeprom/Makefile | 2 ++ drivers/w1-eeprom/w1-eeprom-uclass.c | 56 ++++++++++++++++++++++++++++++++++++ include/dm/uclass-id.h | 1 + include/w1-eeprom.h | 28 ++++++++++++++++++ 7 files changed, 107 insertions(+) create mode 040000 drivers/w1-eeprom create mode 100644 drivers/w1-eeprom/Kconfig create mode 100644 drivers/w1-eeprom/Makefile create mode 100644 drivers/w1-eeprom/w1-eeprom-uclass.c create mode 100644 include/w1-eeprom.h diff --git a/drivers/Kconfig b/drivers/Kconfig index 2cae829..386af75 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -104,6 +104,8 @@ source "drivers/video/Kconfig" source "drivers/w1/Kconfig" +source "drivers/w1-eeprom/Kconfig" + source "drivers/watchdog/Kconfig" config PHYS_TO_BUS diff --git a/drivers/Makefile b/drivers/Makefile index 728380b..de67a17 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -102,6 +102,7 @@ obj-y += soc/ obj-$(CONFIG_REMOTEPROC) += remoteproc/ obj-y += thermal/ obj-$(CONFIG_W1) += w1/ +obj-$(CONFIG_W1_EEPROM) += w1-eeprom/ obj-$(CONFIG_MACH_PIC32) += ddr/microchip/ endif diff --git a/drivers/w1-eeprom/Kconfig b/drivers/w1-eeprom/Kconfig new file mode 100644 index 0000000..d5ddc80 --- /dev/null +++ b/drivers/w1-eeprom/Kconfig @@ -0,0 +1,17 @@ +# +# EEPROM subsystem configuration +# + +menu "1-wire EEPROM support" + +config W1_EEPROM + bool "Enable support for EEPROMs on 1wire interface" + depends on DM + help + Support for the EEPROMs connected on 1-wire Dallas protocol interface + +if W1_EEPROM + +endif + +endmenu diff --git a/drivers/w1-eeprom/Makefile b/drivers/w1-eeprom/Makefile new file mode 100644 index 0000000..b72950e --- /dev/null +++ b/drivers/w1-eeprom/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_W1_EEPROM) += w1-eeprom-uclass.o + diff --git a/drivers/w1-eeprom/w1-eeprom-uclass.c b/drivers/w1-eeprom/w1-eeprom-uclass.c new file mode 100644 index 0000000..4176baf --- /dev/null +++ b/drivers/w1-eeprom/w1-eeprom-uclass.c @@ -0,0 +1,56 @@ +/* SPDX-License-Identifier: GPL-2.0+ + * + * Copyright (c) 2015 Free Electrons + * Copyright (c) 2015 NextThing Co. + * + * Maxime Ripard + * + */ + +#include +#include +#include + +#include + +int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset, + u8 *buf, unsigned int count) +{ + const struct w1_eeprom_ops *ops = device_get_ops(dev); + + if (!ops->read_buf) + return -ENOSYS; + + return ops->read_buf(dev, offset, buf, count); +} + +UCLASS_DRIVER(w1_eeprom) = { + .name = "w1_eeprom", + .id = UCLASS_W1_EEPROM, +}; + +int w1_eeprom_dm_init(void) +{ + struct udevice *bus; + struct uclass *uc; + int ret; + + ret = uclass_get(UCLASS_W1_EEPROM, &uc); + if (ret) + return ret; + + uclass_foreach_dev(bus, uc) { + ret = device_probe(bus); + if (ret == -ENODEV) { /* No such device. */ + debug("W1_EEPROM not available.\n"); + continue; + } + + if (ret) { /* Other error. */ + printf("W1_EEPROM probe failed, error %d\n", ret); + continue; + } + } + + return 0; +} diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h index 8eca9dc..06ff339 100644 --- a/include/dm/uclass-id.h +++ b/include/dm/uclass-id.h @@ -90,6 +90,7 @@ enum uclass_id { UCLASS_VIDEO_BRIDGE, /* Video bridge, e.g. DisplayPort to LVDS */ UCLASS_VIDEO_CONSOLE, /* Text console driver for video device */ UCLASS_W1, /* Dallas 1-Wire bus */ + UCLASS_W1_EEPROM, /* one-wire EEPROMs */ UCLASS_WDT, /* Watchdot Timer driver */ UCLASS_COUNT, diff --git a/include/w1-eeprom.h b/include/w1-eeprom.h new file mode 100644 index 0000000..7c9dd96 --- /dev/null +++ b/include/w1-eeprom.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0+ + * + * Copyright (c) 2015 Free Electrons + * Copyright (c) 2015 NextThing Co + * Copyright (c) 2018 Microchip Technology, Inc. + * + */ + +#ifndef __W1_EEPROM_H +#define __W1_EEPROM_H + +struct udevice; + +struct w1_eeprom_ops { + /* + * Reads a buff from the given EEPROM memory, starting at + * given offset and place the results into the given buffer. + * Should read given count of bytes. + * Should return 0 on success, and normal error.h on error + */ + int (*read_buf)(struct udevice *dev, unsigned int offset, + u8 *buf, unsigned int count); +}; + +int w1_eeprom_read_buf(struct udevice *dev, unsigned int offset, + u8 *buf, unsigned int count); + +#endif