diff options
Diffstat (limited to 'drivers/hwmon/exynos4_tmu.c')
| -rw-r--r-- | drivers/hwmon/exynos4_tmu.c | 518 |
1 files changed, 0 insertions, 518 deletions
diff --git a/drivers/hwmon/exynos4_tmu.c b/drivers/hwmon/exynos4_tmu.c deleted file mode 100644 index e912059140c..00000000000 --- a/drivers/hwmon/exynos4_tmu.c +++ /dev/null @@ -1,518 +0,0 @@ -/* - * exynos4_tmu.c - Samsung EXYNOS4 TMU (Thermal Management Unit) - * - * Copyright (C) 2011 Samsung Electronics - * Donggeun Kim <dg77.kim@samsung.com> - * - * 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, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - */ - -#include <linux/module.h> -#include <linux/err.h> -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/platform_device.h> -#include <linux/interrupt.h> -#include <linux/clk.h> -#include <linux/workqueue.h> -#include <linux/sysfs.h> -#include <linux/kobject.h> -#include <linux/io.h> -#include <linux/mutex.h> - -#include <linux/hwmon.h> -#include <linux/hwmon-sysfs.h> - -#include <linux/platform_data/exynos4_tmu.h> - -#define EXYNOS4_TMU_REG_TRIMINFO 0x0 -#define EXYNOS4_TMU_REG_CONTROL 0x20 -#define EXYNOS4_TMU_REG_STATUS 0x28 -#define EXYNOS4_TMU_REG_CURRENT_TEMP 0x40 -#define EXYNOS4_TMU_REG_THRESHOLD_TEMP 0x44 -#define EXYNOS4_TMU_REG_TRIG_LEVEL0 0x50 -#define EXYNOS4_TMU_REG_TRIG_LEVEL1 0x54 -#define EXYNOS4_TMU_REG_TRIG_LEVEL2 0x58 -#define EXYNOS4_TMU_REG_TRIG_LEVEL3 0x5C -#define EXYNOS4_TMU_REG_PAST_TEMP0 0x60 -#define EXYNOS4_TMU_REG_PAST_TEMP1 0x64 -#define EXYNOS4_TMU_REG_PAST_TEMP2 0x68 -#define EXYNOS4_TMU_REG_PAST_TEMP3 0x6C -#define EXYNOS4_TMU_REG_INTEN 0x70 -#define EXYNOS4_TMU_REG_INTSTAT 0x74 -#define EXYNOS4_TMU_REG_INTCLEAR 0x78 - -#define EXYNOS4_TMU_GAIN_SHIFT 8 -#define EXYNOS4_TMU_REF_VOLTAGE_SHIFT 24 - -#define EXYNOS4_TMU_TRIM_TEMP_MASK 0xff -#define EXYNOS4_TMU_CORE_ON 3 -#define EXYNOS4_TMU_CORE_OFF 2 -#define EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET 50 -#define EXYNOS4_TMU_TRIG_LEVEL0_MASK 0x1 -#define EXYNOS4_TMU_TRIG_LEVEL1_MASK 0x10 -#define EXYNOS4_TMU_TRIG_LEVEL2_MASK 0x100 -#define EXYNOS4_TMU_TRIG_LEVEL3_MASK 0x1000 -#define EXYNOS4_TMU_INTCLEAR_VAL 0x1111 - -struct exynos4_tmu_data { - struct exynos4_tmu_platform_data *pdata; - struct device *hwmon_dev; - struct resource *mem; - void __iomem *base; - int irq; - struct work_struct irq_work; - struct mutex lock; - struct clk *clk; - u8 temp_error1, temp_error2; -}; - -/* - * TMU treats temperature as a mapped temperature code. - * The temperature is converted differently depending on the calibration type. - */ -static int temp_to_code(struct exynos4_tmu_data *data, u8 temp) -{ - struct exynos4_tmu_platform_data *pdata = data->pdata; - int temp_code; - - /* temp should range between 25 and 125 */ - if (temp < 25 || temp > 125) { - temp_code = -EINVAL; - goto out; - } - - switch (pdata->cal_type) { - case TYPE_TWO_POINT_TRIMMING: - temp_code = (temp - 25) * - (data->temp_error2 - data->temp_error1) / - (85 - 25) + data->temp_error1; - break; - case TYPE_ONE_POINT_TRIMMING: - temp_code = temp + data->temp_error1 - 25; - break; - default: - temp_code = temp + EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET; - break; - } -out: - return temp_code; -} - -/* - * Calculate a temperature value from a temperature code. - * The unit of the temperature is degree Celsius. - */ -static int code_to_temp(struct exynos4_tmu_data *data, u8 temp_code) -{ - struct exynos4_tmu_platform_data *pdata = data->pdata; - int temp; - - /* temp_code should range between 75 and 175 */ - if (temp_code < 75 || temp_code > 175) { - temp = -ENODATA; - goto out; - } - - switch (pdata->cal_type) { - case TYPE_TWO_POINT_TRIMMING: - temp = (temp_code - data->temp_error1) * (85 - 25) / - (data->temp_error2 - data->temp_error1) + 25; - break; - case TYPE_ONE_POINT_TRIMMING: - temp = temp_code - data->temp_error1 + 25; - break; - default: - temp = temp_code - EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET; - break; - } -out: - return temp; -} - -static int exynos4_tmu_initialize(struct platform_device *pdev) -{ - struct exynos4_tmu_data *data = platform_get_drvdata(pdev); - struct exynos4_tmu_platform_data *pdata = data->pdata; - unsigned int status, trim_info; - int ret = 0, threshold_code; - - mutex_lock(&data->lock); - clk_enable(data->clk); - - status = readb(data->base + EXYNOS4_TMU_REG_STATUS); - if (!status) { - ret = -EBUSY; - goto out; - } - - /* Save trimming info in order to perform calibration */ - trim_info = readl(data->base + EXYNOS4_TMU_REG_TRIMINFO); - data->temp_error1 = trim_info & EXYNOS4_TMU_TRIM_TEMP_MASK; - data->temp_error2 = ((trim_info >> 8) & EXYNOS4_TMU_TRIM_TEMP_MASK); - - /* Write temperature code for threshold */ - threshold_code = temp_to_code(data, pdata->threshold); - if (threshold_code < 0) { - ret = threshold_code; - goto out; - } - writeb(threshold_code, - data->base + EXYNOS4_TMU_REG_THRESHOLD_TEMP); - - writeb(pdata->trigger_levels[0], - data->base + EXYNOS4_TMU_REG_TRIG_LEVEL0); - writeb(pdata->trigger_levels[1], - data->base + EXYNOS4_TMU_REG_TRIG_LEVEL1); - writeb(pdata->trigger_levels[2], - data->base + EXYNOS4_TMU_REG_TRIG_LEVEL2); - writeb(pdata->trigger_levels[3], - data->base + EXYNOS4_TMU_REG_TRIG_LEVEL3); - - writel(EXYNOS4_TMU_INTCLEAR_VAL, - data->base + EXYNOS4_TMU_REG_INTCLEAR); -out: - clk_disable(data->clk); - mutex_unlock(&data->lock); - - return ret; -} - -static void exynos4_tmu_control(struct platform_device *pdev, bool on) -{ - struct exynos4_tmu_data *data = platform_get_drvdata(pdev); - struct exynos4_tmu_platform_data *pdata = data->pdata; - unsigned int con, interrupt_en; - - mutex_lock(&data->lock); - clk_enable(data->clk); - - con = pdata->reference_voltage << EXYNOS4_TMU_REF_VOLTAGE_SHIFT | - pdata->gain << EXYNOS4_TMU_GAIN_SHIFT; - if (on) { - con |= EXYNOS4_TMU_CORE_ON; - interrupt_en = pdata->trigger_level3_en << 12 | - pdata->trigger_level2_en << 8 | - pdata->trigger_level1_en << 4 | - pdata->trigger_level0_en; - } else { - con |= EXYNOS4_TMU_CORE_OFF; - interrupt_en = 0; /* Disable all interrupts */ - } - writel(interrupt_en, data->base + EXYNOS4_TMU_REG_INTEN); - writel(con, data->base + EXYNOS4_TMU_REG_CONTROL); - - clk_disable(data->clk); - mutex_unlock(&data->lock); -} - -static int exynos4_tmu_read(struct exynos4_tmu_data *data) -{ - u8 temp_code; - int temp; - - mutex_lock(&data->lock); - clk_enable(data->clk); - - temp_code = readb(data->base + EXYNOS4_TMU_REG_CURRENT_TEMP); - temp = code_to_temp(data, temp_code); - - clk_disable(data->clk); - mutex_unlock(&data->lock); - - return temp; -} - -static void exynos4_tmu_work(struct work_struct *work) -{ - struct exynos4_tmu_data *data = container_of(work, - struct exynos4_tmu_data, irq_work); - - mutex_lock(&data->lock); - clk_enable(data->clk); - - writel(EXYNOS4_TMU_INTCLEAR_VAL, data->base + EXYNOS4_TMU_REG_INTCLEAR); - - kobject_uevent(&data->hwmon_dev->kobj, KOBJ_CHANGE); - - enable_irq(data->irq); - - clk_disable(data->clk); - mutex_unlock(&data->lock); -} - -static irqreturn_t exynos4_tmu_irq(int irq, void *id) -{ - struct exynos4_tmu_data *data = id; - - disable_irq_nosync(irq); - schedule_work(&data->irq_work); - - return IRQ_HANDLED; -} - -static ssize_t exynos4_tmu_show_name(struct device *dev, - struct device_attribute *attr, char *buf) -{ - return sprintf(buf, "exynos4-tmu\n"); -} - -static ssize_t exynos4_tmu_show_temp(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct exynos4_tmu_data *data = dev_get_drvdata(dev); - int ret; - - ret = exynos4_tmu_read(data); - if (ret < 0) - return ret; - - /* convert from degree Celsius to millidegree Celsius */ - return sprintf(buf, "%d\n", ret * 1000); -} - -static ssize_t exynos4_tmu_show_alarm(struct device *dev, - struct device_attribute *devattr, char *buf) -{ - struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); - struct exynos4_tmu_data *data = dev_get_drvdata(dev); - struct exynos4_tmu_platform_data *pdata = data->pdata; - int temp; - unsigned int trigger_level; - - temp = exynos4_tmu_read(data); - if (temp < 0) - return temp; - - trigger_level = pdata->threshold + pdata->trigger_levels[attr->index]; - - return sprintf(buf, "%d\n", !!(temp > trigger_level)); -} - -static ssize_t exynos4_tmu_show_level(struct device *dev, - struct device_attribute *devattr, char *buf) -{ - struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); - struct exynos4_tmu_data *data = dev_get_drvdata(dev); - struct exynos4_tmu_platform_data *pdata = data->pdata; - unsigned int temp = pdata->threshold + - pdata->trigger_levels[attr->index]; - - return sprintf(buf, "%u\n", temp * 1000); -} - -static DEVICE_ATTR(name, S_IRUGO, exynos4_tmu_show_name, NULL); -static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, exynos4_tmu_show_temp, NULL, 0); - -static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, - exynos4_tmu_show_alarm, NULL, 1); -static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, - exynos4_tmu_show_alarm, NULL, 2); -static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, - exynos4_tmu_show_alarm, NULL, 3); - -static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, exynos4_tmu_show_level, NULL, 1); -static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, exynos4_tmu_show_level, NULL, 2); -static SENSOR_DEVICE_ATTR(temp1_emergency, S_IRUGO, - exynos4_tmu_show_level, NULL, 3); - -static struct attribute *exynos4_tmu_attributes[] = { - &dev_attr_name.attr, - &sensor_dev_attr_temp1_input.dev_attr.attr, - &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, - &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, - &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, - &sensor_dev_attr_temp1_max.dev_attr.attr, - &sensor_dev_attr_temp1_crit.dev_attr.attr, - &sensor_dev_attr_temp1_emergency.dev_attr.attr, - NULL, -}; - -static const struct attribute_group exynos4_tmu_attr_group = { - .attrs = exynos4_tmu_attributes, -}; - -static int __devinit exynos4_tmu_probe(struct platform_device *pdev) -{ - struct exynos4_tmu_data *data; - struct exynos4_tmu_platform_data *pdata = pdev->dev.platform_data; - int ret; - - if (!pdata) { - dev_err(&pdev->dev, "No platform init data supplied.\n"); - return -ENODEV; - } - - data = kzalloc(sizeof(struct exynos4_tmu_data), GFP_KERNEL); - if (!data) { - dev_err(&pdev->dev, "Failed to allocate driver structure\n"); - return -ENOMEM; - } - - data->irq = platform_get_irq(pdev, 0); - if (data->irq < 0) { - ret = data->irq; - dev_err(&pdev->dev, "Failed to get platform irq\n"); - goto err_free; - } - - INIT_WORK(&data->irq_work, exynos4_tmu_work); - - data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!data->mem) { - ret = -ENOENT; - dev_err(&pdev->dev, "Failed to get platform resource\n"); - goto err_free; - } - - data->mem = request_mem_region(data->mem->start, - resource_size(data->mem), pdev->name); - if (!data->mem) { - ret = -ENODEV; - dev_err(&pdev->dev, "Failed to request memory region\n"); - goto err_free; - } - - data->base = ioremap(data->mem->start, resource_size(data->mem)); - if (!data->base) { - ret = -ENODEV; - dev_err(&pdev->dev, "Failed to ioremap memory\n"); - goto err_mem_region; - } - - ret = request_irq(data->irq, exynos4_tmu_irq, - IRQF_TRIGGER_RISING, - "exynos4-tmu", data); - if (ret) { - dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq); - goto err_io_remap; - } - - data->clk = clk_get(NULL, "tmu_apbif"); - if (IS_ERR(data->clk)) { - ret = PTR_ERR(data->clk); - dev_err(&pdev->dev, "Failed to get clock\n"); - goto err_irq; - } - - data->pdata = pdata; - platform_set_drvdata(pdev, data); - mutex_init(&data->lock); - - ret = exynos4_tmu_initialize(pdev); - if (ret) { - dev_err(&pdev->dev, "Failed to initialize TMU\n"); - goto err_clk; - } - - ret = sysfs_create_group(&pdev->dev.kobj, &exynos4_tmu_attr_group); - if (ret) { - dev_err(&pdev->dev, "Failed to create sysfs group\n"); - goto err_clk; - } - - 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_SLEEP -static int exynos4_tmu_suspend(struct device *dev) -{ - exynos4_tmu_control(to_platform_device(dev), false); - - return 0; -} - -static int exynos4_tmu_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - - exynos4_tmu_initialize(pdev); - exynos4_tmu_control(pdev, true); - - return 0; -} - -static SIMPLE_DEV_PM_OPS(exynos4_tmu_pm, - exynos4_tmu_suspend, exynos4_tmu_resume); -#define EXYNOS4_TMU_PM &exynos4_tmu_pm -#else -#define EXYNOS4_TMU_PM NULL -#endif - -static struct platform_driver exynos4_tmu_driver = { - .driver = { - .name = "exynos4-tmu", - .owner = THIS_MODULE, - .pm = EXYNOS4_TMU_PM, - }, - .probe = exynos4_tmu_probe, - .remove = __devexit_p(exynos4_tmu_remove), -}; - -module_platform_driver(exynos4_tmu_driver); - -MODULE_DESCRIPTION("EXYNOS4 TMU Driver"); -MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:exynos4-tmu"); |