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![Sascha Hauer](/assets/img/avatar_default.png)
The thermal code uses int, long and unsigned long for temperatures in different places. Using an unsigned type limits the thermal framework to positive temperatures without need. Also several drivers currently will report temperatures near UINT_MAX for temperatures below 0°C. This will probably immediately shut the machine down due to overtemperature if started below 0°C. 'long' is 64bit on several architectures. This is not needed since INT_MAX °mC is above the melting point of all known materials. Consistently use a plain 'int' for temperatures throughout the thermal code and the drivers. This only changes the places in the drivers where the temperature is passed around as pointer, when drivers internally use another type this is not changed. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Lukasz Majewski <l.majewski@samsung.com> Reviewed-by: Darren Hart <dvhart@linux.intel.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Peter Feuerer <peter@piie.net> Cc: Punit Agrawal <punit.agrawal@arm.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Eduardo Valentin <edubezval@gmail.com> Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: Jean Delvare <jdelvare@suse.de> Cc: Peter Feuerer <peter@piie.net> Cc: Heiko Stuebner <heiko@sntech.de> Cc: Lukasz Majewski <l.majewski@samsung.com> Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Thierry Reding <thierry.reding@gmail.com> Cc: linux-acpi@vger.kernel.org Cc: platform-driver-x86@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: Guenter Roeck <linux@roeck-us.net> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Maxime Ripard <maxime.ripard@free-electrons.com> Cc: Darren Hart <dvhart@infradead.org> Cc: lm-sensors@lm-sensors.org Signed-off-by: Zhang Rui <rui.zhang@intel.com>
198 lines
5.1 KiB
C
198 lines
5.1 KiB
C
/*
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* SPEAr thermal driver.
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*
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* Copyright (C) 2011-2012 ST Microelectronics
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* Author: Vincenzo Frascino <vincenzo.frascino@st.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/thermal.h>
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#define MD_FACTOR 1000
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/* SPEAr Thermal Sensor Dev Structure */
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struct spear_thermal_dev {
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/* pointer to base address of the thermal sensor */
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void __iomem *thermal_base;
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/* clk structure */
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struct clk *clk;
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/* pointer to thermal flags */
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unsigned int flags;
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};
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static inline int thermal_get_temp(struct thermal_zone_device *thermal,
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int *temp)
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{
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struct spear_thermal_dev *stdev = thermal->devdata;
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/*
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* Data are ready to be read after 628 usec from POWERDOWN signal
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* (PDN) = 1
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*/
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*temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR;
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return 0;
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}
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static struct thermal_zone_device_ops ops = {
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.get_temp = thermal_get_temp,
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};
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#ifdef CONFIG_PM
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static int spear_thermal_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
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struct spear_thermal_dev *stdev = spear_thermal->devdata;
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unsigned int actual_mask = 0;
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/* Disable SPEAr Thermal Sensor */
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actual_mask = readl_relaxed(stdev->thermal_base);
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writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
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clk_disable(stdev->clk);
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dev_info(dev, "Suspended.\n");
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return 0;
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}
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static int spear_thermal_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
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struct spear_thermal_dev *stdev = spear_thermal->devdata;
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unsigned int actual_mask = 0;
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int ret = 0;
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ret = clk_enable(stdev->clk);
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if (ret) {
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dev_err(&pdev->dev, "Can't enable clock\n");
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return ret;
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}
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/* Enable SPEAr Thermal Sensor */
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actual_mask = readl_relaxed(stdev->thermal_base);
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writel_relaxed(actual_mask | stdev->flags, stdev->thermal_base);
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dev_info(dev, "Resumed.\n");
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(spear_thermal_pm_ops, spear_thermal_suspend,
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spear_thermal_resume);
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static int spear_thermal_probe(struct platform_device *pdev)
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{
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struct thermal_zone_device *spear_thermal = NULL;
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struct spear_thermal_dev *stdev;
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struct device_node *np = pdev->dev.of_node;
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struct resource *res;
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int ret = 0, val;
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if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) {
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dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");
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return -EINVAL;
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}
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stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
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if (!stdev)
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return -ENOMEM;
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/* Enable thermal sensor */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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stdev->thermal_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(stdev->thermal_base))
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return PTR_ERR(stdev->thermal_base);
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stdev->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(stdev->clk)) {
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dev_err(&pdev->dev, "Can't get clock\n");
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return PTR_ERR(stdev->clk);
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}
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ret = clk_enable(stdev->clk);
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if (ret) {
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dev_err(&pdev->dev, "Can't enable clock\n");
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return ret;
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}
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stdev->flags = val;
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writel_relaxed(stdev->flags, stdev->thermal_base);
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spear_thermal = thermal_zone_device_register("spear_thermal", 0, 0,
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stdev, &ops, NULL, 0, 0);
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if (IS_ERR(spear_thermal)) {
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dev_err(&pdev->dev, "thermal zone device is NULL\n");
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ret = PTR_ERR(spear_thermal);
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goto disable_clk;
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}
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platform_set_drvdata(pdev, spear_thermal);
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dev_info(&spear_thermal->device, "Thermal Sensor Loaded at: 0x%p.\n",
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stdev->thermal_base);
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return 0;
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disable_clk:
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clk_disable(stdev->clk);
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return ret;
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}
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static int spear_thermal_exit(struct platform_device *pdev)
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{
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unsigned int actual_mask = 0;
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struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
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struct spear_thermal_dev *stdev = spear_thermal->devdata;
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thermal_zone_device_unregister(spear_thermal);
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/* Disable SPEAr Thermal Sensor */
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actual_mask = readl_relaxed(stdev->thermal_base);
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writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
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clk_disable(stdev->clk);
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return 0;
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}
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static const struct of_device_id spear_thermal_id_table[] = {
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{ .compatible = "st,thermal-spear1340" },
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{}
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};
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MODULE_DEVICE_TABLE(of, spear_thermal_id_table);
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static struct platform_driver spear_thermal_driver = {
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.probe = spear_thermal_probe,
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.remove = spear_thermal_exit,
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.driver = {
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.name = "spear_thermal",
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.pm = &spear_thermal_pm_ops,
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.of_match_table = spear_thermal_id_table,
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},
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};
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module_platform_driver(spear_thermal_driver);
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MODULE_AUTHOR("Vincenzo Frascino <vincenzo.frascino@st.com>");
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MODULE_DESCRIPTION("SPEAr thermal driver");
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MODULE_LICENSE("GPL");
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