From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D5870C433DB for ; Tue, 26 Jan 2021 23:36:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9D80920684 for ; Tue, 26 Jan 2021 23:36:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388535AbhAZXXa (ORCPT ); Tue, 26 Jan 2021 18:23:30 -0500 Received: from mga06.intel.com ([134.134.136.31]:32229 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388763AbhAZFqB (ORCPT ); Tue, 26 Jan 2021 00:46:01 -0500 IronPort-SDR: zD1buEwU7p2m1k3j/H9ztYqRtR/RHTtzni0/TCnyqMsZFhW0Bk5RlnzWH268nhMMMe3w+P+q0e dRyZfUpEsy9g== X-IronPort-AV: E=McAfee;i="6000,8403,9875"; a="241381385" X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="241381385" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jan 2021 21:40:41 -0800 IronPort-SDR: F1IXRONNOKtaOcTHi/AaSMx76aTF5kqqIAS/UVen8Z9NVA80g2M55qcdmIaFoP9mtpjFQ+ZSNr KIWm7JioRUUQ== X-IronPort-AV: E=Sophos;i="5.79,375,1602572400"; d="scan'208";a="504418204" Received: from smtp.ostc.intel.com ([10.54.29.231]) by orsmga004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Jan 2021 21:40:41 -0800 Received: from mtg-dev.jf.intel.com (mtg-dev.jf.intel.com [10.54.74.10]) by smtp.ostc.intel.com (Postfix) with ESMTP id A40FB6375; Mon, 25 Jan 2021 21:40:41 -0800 (PST) Received: by mtg-dev.jf.intel.com (Postfix, from userid 1000) id 93AB3363534; Mon, 25 Jan 2021 21:40:41 -0800 (PST) From: mgross@linux.intel.com To: markgross@kernel.org, mgross@linux.intel.com, arnd@arndb.de, bp@suse.de, damien.lemoal@wdc.com, dragan.cvetic@xilinx.com, gregkh@linuxfoundation.org, corbet@lwn.net, palmerdabbelt@google.com, paul.walmsley@sifive.com, peng.fan@nxp.com, robh+dt@kernel.org, shawnguo@kernel.org, jassisinghbrar@gmail.com Cc: linux-kernel@vger.kernel.org, "C, Udhayakumar" , C@linux.intel.com Subject: [PATCH v3 29/34] Intel tsens i2c slave driver. Date: Mon, 25 Jan 2021 21:40:31 -0800 Message-Id: <20210126054036.61587-30-mgross@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210126054036.61587-1-mgross@linux.intel.com> References: <20210126054036.61587-1-mgross@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "C, Udhayakumar" Add Intel tsens i2c slave driver for Intel Edge.AI Computer Vision platforms. The tsens i2c slave driver enables reading of on chip sensors present in the Intel Edge.AI Computer Vision platforms. In the tsens i2c module various junction and SoC temperatures are reported using i2c slave protocol. Signed-off-by: C, Udhayakumar --- drivers/misc/intel_tsens/Kconfig | 15 +++ drivers/misc/intel_tsens/Makefile | 1 + drivers/misc/intel_tsens/intel_tsens_i2c.c | 119 +++++++++++++++++++++ 3 files changed, 135 insertions(+) create mode 100644 drivers/misc/intel_tsens/intel_tsens_i2c.c diff --git a/drivers/misc/intel_tsens/Kconfig b/drivers/misc/intel_tsens/Kconfig index 8b263fdd80c3..9b2198ab28c3 100644 --- a/drivers/misc/intel_tsens/Kconfig +++ b/drivers/misc/intel_tsens/Kconfig @@ -14,6 +14,21 @@ config INTEL_TSENS_LOCAL_HOST Say Y if using a processor that includes the Intel VPU such as Keem Bay. If unsure, say N. +config INTEL_TSENS_I2C_SLAVE + bool "I2C slave driver for intel tsens" + depends on INTEL_TSENS_LOCAL_HOST + select I2C + select I2C_SLAVE + help + This option enables tsens I2C slave driver. + + This driver is used for reporting thermal data via I2C + SMBUS to remote host. + Enable this option if you want to have support for thermal + management controller. + Say Y if using a processor that includes the Intel VPU such as + Keem Bay. If unsure, say N. + config INTEL_TSENS_IA_HOST tristate "Temperature sensor driver for intel tsens remote host" depends on I2C && THERMAL diff --git a/drivers/misc/intel_tsens/Makefile b/drivers/misc/intel_tsens/Makefile index 250dc484fb49..f6f41bbca80c 100644 --- a/drivers/misc/intel_tsens/Makefile +++ b/drivers/misc/intel_tsens/Makefile @@ -5,4 +5,5 @@ # obj-$(CONFIG_INTEL_TSENS_LOCAL_HOST) += intel_tsens_thermal.o +obj-$(CONFIG_INTEL_TSENS_I2C_SLAVE) += intel_tsens_i2c.o obj-$(CONFIG_INTEL_TSENS_IA_HOST) += intel_tsens_host.o diff --git a/drivers/misc/intel_tsens/intel_tsens_i2c.c b/drivers/misc/intel_tsens/intel_tsens_i2c.c new file mode 100644 index 000000000000..520c3f4bf392 --- /dev/null +++ b/drivers/misc/intel_tsens/intel_tsens_i2c.c @@ -0,0 +1,119 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * + * Intel tsens I2C thermal Driver + * + * Copyright (C) 2020 Intel Corporation + * + */ + +#include +#include +#include +#include +#include "intel_tsens_thermal.h" + +#define TSENS_BYTE_INDEX_SHIFT 0x6 +#define TSENS_BYTE_INDEX_MASK 0x3 +#define TSENS_SENSOR_TYPE_MASK 0x3F + +struct intel_tsens_i2c { + int sensor_type; + u16 buffer_idx; + bool read_only; + u8 idx_write_cnt; + struct intel_tsens_i2c_plat_data *plat_data; +}; + +static int intel_i2c_tsens_slave_cb(struct i2c_client *client, + enum i2c_slave_event event, u8 *val) +{ + struct intel_tsens_i2c *tsens_i2c = i2c_get_clientdata(client); + struct intel_tsens_i2c_plat_data *plat_data = tsens_i2c->plat_data; + int ret = 0; + + switch (event) { + case I2C_SLAVE_WRITE_RECEIVED: + tsens_i2c->sensor_type = *val; + break; + + case I2C_SLAVE_READ_PROCESSED: + case I2C_SLAVE_READ_REQUESTED: + if (plat_data->get_temp) { + int temp; + int sensor_type = tsens_i2c->sensor_type & + TSENS_SENSOR_TYPE_MASK; + + if (!plat_data->get_temp(sensor_type, &temp, + plat_data->pdata)) { + u8 offset = (tsens_i2c->sensor_type >> + TSENS_BYTE_INDEX_SHIFT) & + TSENS_BYTE_INDEX_MASK; + u8 *ptr_temp = (u8 *)&temp; + + *val = ptr_temp[offset]; + tsens_i2c->buffer_idx++; + ret = 0; + } else { + ret = -EINVAL; + } + } else { + ret = -EINVAL; + } + break; + + case I2C_SLAVE_STOP: + case I2C_SLAVE_WRITE_REQUESTED: + tsens_i2c->idx_write_cnt = 0; + tsens_i2c->buffer_idx = 0; + break; + + default: + break; + } + return ret; +} + +static int intel_i2c_tsens_slave_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ struct intel_tsens_i2c *priv; + int ret; + + if (!id->driver_data) { + dev_err(&client->dev, "No platform data"); + return -EINVAL; + } + priv = devm_kzalloc(&client->dev, + sizeof(struct intel_tsens_i2c), + GFP_KERNEL); + if (!priv) + return -ENOMEM; + priv->plat_data = (struct intel_tsens_i2c_plat_data *)id->driver_data; + i2c_set_clientdata(client, priv); + ret = i2c_slave_register(client, intel_i2c_tsens_slave_cb); + if (ret) + dev_err(&client->dev, "i2c slave register failed\n"); + + return ret; +}; + +static struct i2c_device_id intel_i2c_tsens_slave_id[] = { + { "intel_tsens", (kernel_ulong_t)&i2c_plat_data}, + {} +}; +MODULE_DEVICE_TABLE(i2c, intel_i2c_tsens_slave_id); + +static struct i2c_driver intel_i2c_tsens_slave_driver = { + .driver = { + .name = "intel_tsens", + }, + .probe = intel_i2c_tsens_slave_probe, + .remove = i2c_slave_unregister, + .id_table = intel_i2c_tsens_slave_id, +}; + +module_i2c_driver(intel_i2c_tsens_slave_driver); + +MODULE_AUTHOR("Udhayakumar C "); +MODULE_DESCRIPTION("tsens i2c slave driver"); +MODULE_LICENSE("GPL"); -- 2.17.1