Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753041AbdHQNC3 (ORCPT ); Thu, 17 Aug 2017 09:02:29 -0400 Received: from ms.tdt.de ([195.243.126.94]:53005 "EHLO mail.dev.tdt.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753132AbdHQNCM (ORCPT ); Thu, 17 Aug 2017 09:02:12 -0400 X-Greylist: delayed 533 seconds by postgrey-1.27 at vger.kernel.org; Thu, 17 Aug 2017 09:02:11 EDT From: Florian Eckert To: jdelvare@suse.com, linux@roeck-us.net, linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/2] hwmon: (ltq-cputemp) add cpu temp sensor for xrx200 Date: Thu, 17 Aug 2017 14:53:10 +0200 Message-Id: <20170817125311.24679-1-fe@dev.tdt.de> X-Mailer: git-send-email 2.11.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5497 Lines: 204 Add the lantiq cpu temperature sensor support for xrx200. Signed-off-by: Florian Eckert --- drivers/hwmon/Kconfig | 8 +++ drivers/hwmon/Makefile | 1 + drivers/hwmon/ltq-cputemp.c | 155 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 164 insertions(+) create mode 100644 drivers/hwmon/ltq-cputemp.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 5ef2814345ef..ed3f5e1d10cc 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -790,6 +790,14 @@ config SENSORS_LTC4261 This driver can also be built as a module. If so, the module will be called ltc4261. +config SENSORS_LTQ_CPUTEMP + bool "Lantiq cpu temperature sensor for xrx200" + depends on LANTIQ + default n + help + If you say yes here you get support for the temperature + sensor inside your xrx200 CPU. + config SENSORS_MAX1111 tristate "Maxim MAX1111 Serial 8-bit ADC chip and compatibles" depends on SPI_MASTER diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index d4641a9f16c1..c84d9784be98 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -110,6 +110,7 @@ obj-$(CONFIG_SENSORS_LTC4222) += ltc4222.o obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o obj-$(CONFIG_SENSORS_LTC4260) += ltc4260.o obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o +obj-$(CONFIG_SENSORS_LTQ_CPUTEMP) += ltq-cputemp.o obj-$(CONFIG_SENSORS_MAX1111) += max1111.o obj-$(CONFIG_SENSORS_MAX16065) += max16065.o obj-$(CONFIG_SENSORS_MAX1619) += max1619.o diff --git a/drivers/hwmon/ltq-cputemp.c b/drivers/hwmon/ltq-cputemp.c new file mode 100644 index 000000000000..a6f820533164 --- /dev/null +++ b/drivers/hwmon/ltq-cputemp.c @@ -0,0 +1,155 @@ +/* Lantiq cpu temperature sensor driver for xrx200 + * + * Copyright (C) 2017 Florian Eckert + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version + * + * This program is distributed in the hope that it will be useful + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see + */ + +#include +#include +#include +#include +#include +#include + +#include + +/* gphy1 configuration register contains cpu temperature */ +#define CGU_GPHY1_CR 0x0040 +#define CGU_TEMP_PD BIT(19) + +static void ltq_cputemp_enable(void) +{ + ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) | CGU_TEMP_PD, CGU_GPHY1_CR); + + /* wait a short moment to let the SoC get the first temperatur value */ + mdelay(100); +} + +static void ltq_cputemp_disable(void) +{ + ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) & ~CGU_TEMP_PD, CGU_GPHY1_CR); +} + +static int ltq_cputemp_read(void) +{ + int value; + + /* get the temperature including one decimal place */ + value = (ltq_cgu_r32(CGU_GPHY1_CR) >> 9) & 0x01FF; + value = (value << 2) + value; + + /* range -38 to +154 °C, register value zero is -38.0 °C */ + value -= 380; + + return value; +} + +static ssize_t show_cputemp(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int value; + + value = ltq_cputemp_read(); + /* scale temp to millidegree */ + value = value * 100; + + return sprintf(buf, "%d\n", value); +} + +static DEVICE_ATTR(temp1_input, S_IRUGO, show_cputemp, NULL); + +static struct attribute *ltq_cputemp_attrs[] = { + &dev_attr_temp1_input.attr, + NULL +}; + +ATTRIBUTE_GROUPS(ltq_cputemp); + +static int ltq_cputemp_probe(struct platform_device *pdev) +{ + int value = 0; + int ret; + struct device *hwmon_dev; + + /* available on vr9 v1.2 SoCs only */ + if (ltq_soc_type() != SOC_TYPE_VR9_2) + return -ENODEV; + + hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev, + "CPU0", + NULL, + ltq_cputemp_groups); + + if (IS_ERR(hwmon_dev)) { + dev_err(&pdev->dev, "Failed to register as hwmon device"); + ret = PTR_ERR(hwmon_dev); + goto error_hwmon; + } + + ltq_cputemp_enable(); + value = ltq_cputemp_read(); + dev_info(&pdev->dev, + "Current CPU die temperature: %d.%d °C", + value / 10, + value % 10); + + return 0; + +error_hwmon: + return ret; +} + +static int ltq_cputemp_release(struct platform_device *pdev) +{ + hwmon_device_unregister(&pdev->dev); + ltq_cputemp_disable(); + return 0; +} + +const struct of_device_id ltq_cputemp_match[] = { + { .compatible = "lantiq,cputemp" }, + {}, +}; +MODULE_DEVICE_TABLE(of, ltq_cputemp_match); + +static struct platform_driver ltq_cputemp_driver = { + .probe = ltq_cputemp_probe, + .remove = ltq_cputemp_release, + .driver = { + .name = "ltq-cputemp", + .owner = THIS_MODULE, + .of_match_table = ltq_cputemp_match, + }, +}; + +int __init init_ltq_cputemp(void) +{ + int ret; + + ret = platform_driver_register(<q_cputemp_driver); + return ret; +} + +void clean_ltq_cputemp(void) +{ + platform_driver_unregister(<q_cputemp_driver); +} + +module_init(init_ltq_cputemp); +module_exit(clean_ltq_cputemp); + +MODULE_AUTHOR("Florian Eckert "); +MODULE_DESCRIPTION("Lantiq Temperature Sensor"); +MODULE_LICENSE("GPL"); -- 2.11.0