hwmon: Add driver for EXYNOS4 TMU
This patch allows to read temperature from TMU(Thermal Management Unit) of SAMSUNG EXYNOS4 series of SoC. Signed-off-by: Donggeun Kim <dg77.kim@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
This commit is contained in:
Donggeun Kim
committed by
Guenter Roeck
Guenter Roeck
parent
5cf231a346
commit
9d97e5c81e
524
drivers/hwmon/exynos4_tmu.c
Normal file
524
drivers/hwmon/exynos4_tmu.c
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@ -0,0 +1,524 @@
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/*
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* exynos4_tmu.c - Samsung EXYNOS4 TMU (Thermal Management Unit)
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*
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* Copyright (C) 2011 Samsung Electronics
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* Donggeun Kim <dg77.kim@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/clk.h>
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#include <linux/workqueue.h>
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#include <linux/sysfs.h>
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#include <linux/kobject.h>
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#include <linux/io.h>
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#include <linux/mutex.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/platform_data/exynos4_tmu.h>
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#define EXYNOS4_TMU_REG_TRIMINFO 0x0
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#define EXYNOS4_TMU_REG_CONTROL 0x20
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#define EXYNOS4_TMU_REG_STATUS 0x28
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#define EXYNOS4_TMU_REG_CURRENT_TEMP 0x40
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#define EXYNOS4_TMU_REG_THRESHOLD_TEMP 0x44
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#define EXYNOS4_TMU_REG_TRIG_LEVEL0 0x50
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#define EXYNOS4_TMU_REG_TRIG_LEVEL1 0x54
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#define EXYNOS4_TMU_REG_TRIG_LEVEL2 0x58
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#define EXYNOS4_TMU_REG_TRIG_LEVEL3 0x5C
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#define EXYNOS4_TMU_REG_PAST_TEMP0 0x60
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#define EXYNOS4_TMU_REG_PAST_TEMP1 0x64
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#define EXYNOS4_TMU_REG_PAST_TEMP2 0x68
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#define EXYNOS4_TMU_REG_PAST_TEMP3 0x6C
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#define EXYNOS4_TMU_REG_INTEN 0x70
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#define EXYNOS4_TMU_REG_INTSTAT 0x74
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#define EXYNOS4_TMU_REG_INTCLEAR 0x78
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#define EXYNOS4_TMU_GAIN_SHIFT 8
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#define EXYNOS4_TMU_REF_VOLTAGE_SHIFT 24
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#define EXYNOS4_TMU_TRIM_TEMP_MASK 0xff
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#define EXYNOS4_TMU_CORE_ON 3
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#define EXYNOS4_TMU_CORE_OFF 2
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#define EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET 50
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#define EXYNOS4_TMU_TRIG_LEVEL0_MASK 0x1
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#define EXYNOS4_TMU_TRIG_LEVEL1_MASK 0x10
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#define EXYNOS4_TMU_TRIG_LEVEL2_MASK 0x100
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#define EXYNOS4_TMU_TRIG_LEVEL3_MASK 0x1000
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#define EXYNOS4_TMU_INTCLEAR_VAL 0x1111
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struct exynos4_tmu_data {
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struct exynos4_tmu_platform_data *pdata;
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struct device *hwmon_dev;
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struct resource *mem;
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void __iomem *base;
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int irq;
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struct work_struct irq_work;
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struct mutex lock;
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struct clk *clk;
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u8 temp_error1, temp_error2;
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};
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/*
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* TMU treats temperature as a mapped temperature code.
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* The temperature is converted differently depending on the calibration type.
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*/
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static int temp_to_code(struct exynos4_tmu_data *data, u8 temp)
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{
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struct exynos4_tmu_platform_data *pdata = data->pdata;
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int temp_code;
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/* temp should range between 25 and 125 */
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if (temp < 25 || temp > 125) {
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temp_code = -EINVAL;
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goto out;
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}
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switch (pdata->cal_type) {
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case TYPE_TWO_POINT_TRIMMING:
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temp_code = (temp - 25) *
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(data->temp_error2 - data->temp_error1) /
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(85 - 25) + data->temp_error1;
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break;
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case TYPE_ONE_POINT_TRIMMING:
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temp_code = temp + data->temp_error1 - 25;
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break;
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default:
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temp_code = temp + EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET;
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break;
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}
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out:
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return temp_code;
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}
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/*
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* Calculate a temperature value from a temperature code.
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* The unit of the temperature is degree Celsius.
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*/
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static int code_to_temp(struct exynos4_tmu_data *data, u8 temp_code)
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{
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struct exynos4_tmu_platform_data *pdata = data->pdata;
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int temp;
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/* temp_code should range between 75 and 175 */
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if (temp_code < 75 || temp_code > 175) {
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temp = -ENODATA;
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goto out;
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}
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switch (pdata->cal_type) {
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case TYPE_TWO_POINT_TRIMMING:
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temp = (temp_code - data->temp_error1) * (85 - 25) /
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(data->temp_error2 - data->temp_error1) + 25;
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break;
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case TYPE_ONE_POINT_TRIMMING:
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temp = temp_code - data->temp_error1 + 25;
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break;
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default:
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temp = temp_code - EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET;
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break;
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}
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out:
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return temp;
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}
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static int exynos4_tmu_initialize(struct platform_device *pdev)
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{
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struct exynos4_tmu_data *data = platform_get_drvdata(pdev);
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struct exynos4_tmu_platform_data *pdata = data->pdata;
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unsigned int status, trim_info;
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int ret = 0, threshold_code;
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mutex_lock(&data->lock);
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clk_enable(data->clk);
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status = readb(data->base + EXYNOS4_TMU_REG_STATUS);
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if (!status) {
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ret = -EBUSY;
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goto out;
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}
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/* Save trimming info in order to perform calibration */
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trim_info = readl(data->base + EXYNOS4_TMU_REG_TRIMINFO);
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data->temp_error1 = trim_info & EXYNOS4_TMU_TRIM_TEMP_MASK;
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data->temp_error2 = ((trim_info >> 8) & EXYNOS4_TMU_TRIM_TEMP_MASK);
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/* Write temperature code for threshold */
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threshold_code = temp_to_code(data, pdata->threshold);
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if (threshold_code < 0) {
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ret = threshold_code;
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goto out;
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}
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writeb(threshold_code,
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data->base + EXYNOS4_TMU_REG_THRESHOLD_TEMP);
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writeb(pdata->trigger_levels[0],
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data->base + EXYNOS4_TMU_REG_TRIG_LEVEL0);
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writeb(pdata->trigger_levels[1],
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data->base + EXYNOS4_TMU_REG_TRIG_LEVEL1);
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writeb(pdata->trigger_levels[2],
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data->base + EXYNOS4_TMU_REG_TRIG_LEVEL2);
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writeb(pdata->trigger_levels[3],
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data->base + EXYNOS4_TMU_REG_TRIG_LEVEL3);
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writel(EXYNOS4_TMU_INTCLEAR_VAL,
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data->base + EXYNOS4_TMU_REG_INTCLEAR);
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out:
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clk_disable(data->clk);
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mutex_unlock(&data->lock);
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return ret;
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}
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static void exynos4_tmu_control(struct platform_device *pdev, bool on)
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{
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struct exynos4_tmu_data *data = platform_get_drvdata(pdev);
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struct exynos4_tmu_platform_data *pdata = data->pdata;
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unsigned int con, interrupt_en;
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mutex_lock(&data->lock);
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clk_enable(data->clk);
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con = pdata->reference_voltage << EXYNOS4_TMU_REF_VOLTAGE_SHIFT |
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pdata->gain << EXYNOS4_TMU_GAIN_SHIFT;
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if (on) {
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con |= EXYNOS4_TMU_CORE_ON;
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interrupt_en = pdata->trigger_level3_en << 12 |
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pdata->trigger_level2_en << 8 |
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pdata->trigger_level1_en << 4 |
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pdata->trigger_level0_en;
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} else {
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con |= EXYNOS4_TMU_CORE_OFF;
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interrupt_en = 0; /* Disable all interrupts */
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}
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writel(interrupt_en, data->base + EXYNOS4_TMU_REG_INTEN);
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writel(con, data->base + EXYNOS4_TMU_REG_CONTROL);
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clk_disable(data->clk);
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mutex_unlock(&data->lock);
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}
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static int exynos4_tmu_read(struct exynos4_tmu_data *data)
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{
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u8 temp_code;
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int temp;
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mutex_lock(&data->lock);
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clk_enable(data->clk);
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temp_code = readb(data->base + EXYNOS4_TMU_REG_CURRENT_TEMP);
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temp = code_to_temp(data, temp_code);
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clk_disable(data->clk);
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mutex_unlock(&data->lock);
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return temp;
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}
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static void exynos4_tmu_work(struct work_struct *work)
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{
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struct exynos4_tmu_data *data = container_of(work,
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struct exynos4_tmu_data, irq_work);
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mutex_lock(&data->lock);
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clk_enable(data->clk);
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writel(EXYNOS4_TMU_INTCLEAR_VAL, data->base + EXYNOS4_TMU_REG_INTCLEAR);
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kobject_uevent(&data->hwmon_dev->kobj, KOBJ_CHANGE);
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enable_irq(data->irq);
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clk_disable(data->clk);
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mutex_unlock(&data->lock);
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}
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static irqreturn_t exynos4_tmu_irq(int irq, void *id)
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{
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struct exynos4_tmu_data *data = id;
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disable_irq_nosync(irq);
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schedule_work(&data->irq_work);
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return IRQ_HANDLED;
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}
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static ssize_t exynos4_tmu_show_name(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "exynos4-tmu\n");
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}
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static ssize_t exynos4_tmu_show_temp(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct exynos4_tmu_data *data = dev_get_drvdata(dev);
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int ret;
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ret = exynos4_tmu_read(data);
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if (ret < 0)
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return ret;
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/* convert from degree Celsius to millidegree Celsius */
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return sprintf(buf, "%d\n", ret * 1000);
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}
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static ssize_t exynos4_tmu_show_alarm(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct exynos4_tmu_data *data = dev_get_drvdata(dev);
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struct exynos4_tmu_platform_data *pdata = data->pdata;
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int temp;
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unsigned int trigger_level;
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temp = exynos4_tmu_read(data);
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if (temp < 0)
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return temp;
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trigger_level = pdata->threshold + pdata->trigger_levels[attr->index];
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return sprintf(buf, "%d\n", !!(temp > trigger_level));
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}
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static ssize_t exynos4_tmu_show_level(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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struct exynos4_tmu_data *data = dev_get_drvdata(dev);
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struct exynos4_tmu_platform_data *pdata = data->pdata;
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unsigned int temp = pdata->threshold +
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pdata->trigger_levels[attr->index];
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return sprintf(buf, "%u\n", temp * 1000);
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}
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static DEVICE_ATTR(name, S_IRUGO, exynos4_tmu_show_name, NULL);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, exynos4_tmu_show_temp, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
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exynos4_tmu_show_alarm, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO,
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exynos4_tmu_show_alarm, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO,
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exynos4_tmu_show_alarm, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, exynos4_tmu_show_level, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, exynos4_tmu_show_level, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp1_emergency, S_IRUGO,
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exynos4_tmu_show_level, NULL, 3);
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static struct attribute *exynos4_tmu_attributes[] = {
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&dev_attr_name.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_crit.dev_attr.attr,
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&sensor_dev_attr_temp1_emergency.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group exynos4_tmu_attr_group = {
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.attrs = exynos4_tmu_attributes,
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};
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static int __devinit exynos4_tmu_probe(struct platform_device *pdev)
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{
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struct exynos4_tmu_data *data;
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struct exynos4_tmu_platform_data *pdata = pdev->dev.platform_data;
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int ret;
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if (!pdata) {
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dev_err(&pdev->dev, "No platform init data supplied.\n");
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return -ENODEV;
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}
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data = kzalloc(sizeof(struct exynos4_tmu_data), GFP_KERNEL);
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if (!data) {
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dev_err(&pdev->dev, "Failed to allocate driver structure\n");
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return -ENOMEM;
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}
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data->irq = platform_get_irq(pdev, 0);
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if (data->irq < 0) {
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ret = data->irq;
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dev_err(&pdev->dev, "Failed to get platform irq\n");
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goto err_free;
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}
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INIT_WORK(&data->irq_work, exynos4_tmu_work);
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data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!data->mem) {
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ret = -ENOENT;
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dev_err(&pdev->dev, "Failed to get platform resource\n");
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goto err_free;
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}
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data->mem = request_mem_region(data->mem->start,
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resource_size(data->mem), pdev->name);
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if (!data->mem) {
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ret = -ENODEV;
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dev_err(&pdev->dev, "Failed to request memory region\n");
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goto err_free;
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}
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data->base = ioremap(data->mem->start, resource_size(data->mem));
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if (!data->base) {
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ret = -ENODEV;
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dev_err(&pdev->dev, "Failed to ioremap memory\n");
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goto err_mem_region;
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}
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ret = request_irq(data->irq, exynos4_tmu_irq,
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IRQF_DISABLED | IRQF_TRIGGER_RISING,
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"exynos4-tmu", data);
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if (ret) {
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dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
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goto err_io_remap;
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}
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data->clk = clk_get(NULL, "tmu_apbif");
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if (IS_ERR(data->clk)) {
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ret = PTR_ERR(data->clk);
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dev_err(&pdev->dev, "Failed to get clock\n");
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goto err_irq;
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}
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data->pdata = pdata;
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platform_set_drvdata(pdev, data);
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mutex_init(&data->lock);
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ret = exynos4_tmu_initialize(pdev);
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if (ret) {
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dev_err(&pdev->dev, "Failed to initialize TMU\n");
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goto err_clk;
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}
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ret = sysfs_create_group(&pdev->dev.kobj, &exynos4_tmu_attr_group);
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if (ret) {
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dev_err(&pdev->dev, "Failed to create sysfs group\n");
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goto err_clk;
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}
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data->hwmon_dev = hwmon_device_register(&pdev->dev);
|
||||
if (IS_ERR(data->hwmon_dev)) {
|
||||
ret = PTR_ERR(data->hwmon_dev);
|
||||
dev_err(&pdev->dev, "Failed to register hwmon device\n");
|
||||
goto err_create_group;
|
||||
}
|
||||
|
||||
exynos4_tmu_control(pdev, true);
|
||||
|
||||
return 0;
|
||||
|
||||
err_create_group:
|
||||
sysfs_remove_group(&pdev->dev.kobj, &exynos4_tmu_attr_group);
|
||||
err_clk:
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
clk_put(data->clk);
|
||||
err_irq:
|
||||
free_irq(data->irq, data);
|
||||
err_io_remap:
|
||||
iounmap(data->base);
|
||||
err_mem_region:
|
||||
release_mem_region(data->mem->start, resource_size(data->mem));
|
||||
err_free:
|
||||
kfree(data);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devexit exynos4_tmu_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct exynos4_tmu_data *data = platform_get_drvdata(pdev);
|
||||
|
||||
exynos4_tmu_control(pdev, false);
|
||||
|
||||
hwmon_device_unregister(data->hwmon_dev);
|
||||
sysfs_remove_group(&pdev->dev.kobj, &exynos4_tmu_attr_group);
|
||||
|
||||
clk_put(data->clk);
|
||||
|
||||
free_irq(data->irq, data);
|
||||
|
||||
iounmap(data->base);
|
||||
release_mem_region(data->mem->start, resource_size(data->mem));
|
||||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
kfree(data);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int exynos4_tmu_suspend(struct platform_device *pdev, pm_message_t state)
|
||||
{
|
||||
exynos4_tmu_control(pdev, false);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int exynos4_tmu_resume(struct platform_device *pdev)
|
||||
{
|
||||
exynos4_tmu_initialize(pdev);
|
||||
exynos4_tmu_control(pdev, true);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define exynos4_tmu_suspend NULL
|
||||
#define exynos4_tmu_resume NULL
|
||||
#endif
|
||||
|
||||
static struct platform_driver exynos4_tmu_driver = {
|
||||
.driver = {
|
||||
.name = "exynos4-tmu",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = exynos4_tmu_probe,
|
||||
.remove = __devexit_p(exynos4_tmu_remove),
|
||||
.suspend = exynos4_tmu_suspend,
|
||||
.resume = exynos4_tmu_resume,
|
||||
};
|
||||
|
||||
static int __init exynos4_tmu_driver_init(void)
|
||||
{
|
||||
return platform_driver_register(&exynos4_tmu_driver);
|
||||
}
|
||||
module_init(exynos4_tmu_driver_init);
|
||||
|
||||
static void __exit exynos4_tmu_driver_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&exynos4_tmu_driver);
|
||||
}
|
||||
module_exit(exynos4_tmu_driver_exit);
|
||||
|
||||
MODULE_DESCRIPTION("EXYNOS4 TMU Driver");
|
||||
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:exynos4-tmu");
|
||||
Reference in New Issue
Block a user