Hi, On Thu, Aug 11, 2011 at 03:27:26PM +0530, J, KEERTHY wrote: > On Wed, Aug 10, 2011 at 6:16 PM, Felipe Balbi <balbi@xxxxxx> wrote: > > Hi, > > > > (why aren't below in Cc ? > > I will add them. > > > > > HARDWARE MONITORING > > M: Jean Delvare <khali@xxxxxxxxxxxx> > > M: Guenter Roeck <guenter.roeck@xxxxxxxxxxxx> > > L: lm-sensors@xxxxxxxxxxxxxx > > W: http://www.lm-sensors.org/ > > T: quilt kernel.org/pub/linux/kernel/people/jdelvare/linux-2.6/jdelvare-hwmon/ > > T: git git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git > > S: Maintained > > F: Documentation/hwmon/ > > F: drivers/hwmon/ > > F: include/linux/hwmon*.h) > > > > On Wed, Aug 10, 2011 at 05:55:22PM +0530, Keerthy wrote: > >> On chip temperature sensor driver. The driver monitors the temperature of > >> the MPU subsystem of the OMAP4. It sends notifications to the user space if > >> the temperature crosses user defined thresholds via kobject_uevent interface. > >> The user is allowed to configure the temperature thresholds vis sysfs nodes > >> exposed using hwmon interface. > >> > >> Signed-off-by: Keerthy <j-keerthy@xxxxxx> > >> --- > >> drivers/hwmon/Kconfig | 11 + > >> drivers/hwmon/Makefile | 1 + > >> drivers/hwmon/omap_temp_sensor.c | 950 ++++++++++++++++++++++++++++++++++++++ > >> 3 files changed, 962 insertions(+), 0 deletions(-) > >> create mode 100644 drivers/hwmon/omap_temp_sensor.c > >> > >> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > >> index 5f888f7..9c9cd8b 100644 > >> --- a/drivers/hwmon/Kconfig > >> +++ b/drivers/hwmon/Kconfig > >> @@ -323,6 +323,17 @@ config SENSORS_F71805F > >> This driver can also be built as a module. If so, the module > >> will be called f71805f. > >> > >> +config SENSORS_OMAP_BANDGAP_TEMP_SENSOR > >> + bool "OMAP on-die temperature sensor hwmon driver" > >> + depends on HWMON && ARCH_OMAP && OMAP_TEMP_SENSOR > >> + help > >> + If you say yes here you get support for hardware > >> + monitoring features of the OMAP on die temperature > >> + sensor. > >> + > >> + Continuous conversion programmable delay > >> + mode is used for temperature conversion. > >> + > >> config SENSORS_F71882FG > >> tristate "Fintek F71882FG and compatibles" > >> help > >> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile > >> index 28061cf..d0f89f5 100644 > >> --- a/drivers/hwmon/Makefile > >> +++ b/drivers/hwmon/Makefile > >> @@ -91,6 +91,7 @@ obj-$(CONFIG_SENSORS_MAX6639) += max6639.o > >> obj-$(CONFIG_SENSORS_MAX6642) += max6642.o > >> obj-$(CONFIG_SENSORS_MAX6650) += max6650.o > >> obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o > >> +obj-$(CONFIG_SENSORS_OMAP_BANDGAP_TEMP_SENSOR) += omap_temp_sensor.o > >> obj-$(CONFIG_SENSORS_PC87360) += pc87360.o > >> obj-$(CONFIG_SENSORS_PC87427) += pc87427.o > >> obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o > >> diff --git a/drivers/hwmon/omap_temp_sensor.c b/drivers/hwmon/omap_temp_sensor.c > >> new file mode 100644 > >> index 0000000..15e2559 > >> --- /dev/null > >> +++ b/drivers/hwmon/omap_temp_sensor.c > >> @@ -0,0 +1,950 @@ > >> +/* > >> + * OMAP4 Temperature sensor driver file > >> + * > >> + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ > >> + * Author: J Keerthy <j-keerthy@xxxxxx> > >> + * Author: Moiz Sonasath <m-sonasath@xxxxxx> > >> + * > >> + * This program is free software; you can redistribute it and/or > >> + * modify it under the terms of the GNU General Public License > >> + * version 2 as published by the Free Software Foundation. > >> + * > >> + * 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., 51 Franklin St, Fifth Floor, Boston, MA > >> + * 02110-1301 USA > >> + * > >> + */ > >> + > >> +#include <linux/interrupt.h> > >> +#include <linux/clk.h> > > > > why ?? > > Clock rate setting functions. you shouldn't need in drivers. > >> +#include <linux/io.h> > >> +#include <linux/debugfs.h> > > > > why ?? > > It will be removed. > > > > >> +#include <linux/delay.h> > >> +#include <linux/slab.h> > >> +#include <linux/platform_device.h> > >> +#include <linux/init.h> > >> +#include <plat/omap_device.h> > > > > why ?? > > > > Context loss count shouldn't use in drivers. > >> +#include <linux/module.h> > >> +#include <linux/kernel.h> > >> +#include <linux/device.h> > >> +#include <linux/jiffies.h> > >> +#include <linux/hwmon.h> > >> +#include <linux/hwmon-sysfs.h> > >> +#include <linux/stddef.h> > >> +#include <linux/sysfs.h> > >> +#include <linux/err.h> > >> +#include <linux/types.h> > >> +#include <linux/mutex.h> > >> +#include <linux/pm_runtime.h> > >> +#include <plat/common.h> > > > > why ? > > usleep_range function. plat/common for usleep_range ?? usleep_range is defined in <linux/delay.h> > >> +#include <plat/temperature_sensor.h> > > > > It is the header file with the structure definitions > used in the driver. why don't you put in <linux/platform_data/....> ?? > >> +#include <mach/ctrl_module_core_44xx.h> > > > > why ? > > It will be removed > > > > >> +#include <mach/gpio.h> > > > > linux/gpio.h for crying out loud... how many times Russell has to say > > the exact same thing ?????? > > > > It will be removed oh, you don't even use any gpio ? Why do you blindly add so many headers if you don't need them ??? > >> +#define TSHUT_THRESHOLD_HOT 122000 /* 122 deg C */ > >> +#define TSHUT_THRESHOLD_COLD 100000 /* 100 deg C */ > >> +#define BGAP_THRESHOLD_T_HOT 73000 /* 73 deg C */ > >> +#define BGAP_THRESHOLD_T_COLD 71000 /* 71 deg C */ > >> +#define OMAP_ADC_START_VALUE 530 > >> +#define OMAP_ADC_END_VALUE 923 > >> + > >> +/* > >> + * omap_temp_sensor structure > >> + * @hwmon_dev - device pointer > >> + * @clock - Clock pointer > >> + * @registers - Pointer to structure with register offsets and bitfields > >> + * @sensor_mutex - Mutex for sysfs, irq and PM > >> + * @irq - MPU Irq number for thermal alert > >> + * @phy_base - Physical base of the temp I/O > >> + * @clk_rate - Holds current clock rate > >> + * @temp_sensor_ctrl - temp sensor control register value > >> + * @bg_ctrl - bandgap ctrl register value > >> + * @bg_counter - bandgap counter value > >> + * @bg_threshold - bandgap threshold register value > >> + * @temp_sensor_tshut_threshold - bandgap tshut register value > >> + * @is_efuse_valid - Flag to determine if efuse is valid or not > >> + * @clk_on - Manages the current clock state > >> + */ > >> +struct omap_temp_sensor { > >> + struct device *hwmon_dev; > >> + struct clk *clock; > >> + struct omap_temp_sensor_registers *registers; > >> + struct mutex sensor_mutex; /* Mutex for sysfs, irq and PM */ > >> + unsigned int irq; > >> + void __iomem *phy_base; > >> + u32 clk_rate; > >> + u32 temp_sensor_ctrl; > >> + u32 bg_ctrl; > >> + u32 bg_counter; > >> + u32 bg_threshold; > >> + u32 temp_sensor_tshut_threshold; > >> + bool is_efuse_valid; > >> + bool clk_on; > >> +}; > >> + > >> +/* > >> + * Temperature values in milli degree celsius > >> + * ADC code values from 530 to 923 > >> + */ > >> +static int adc_to_temp[] = { > >> + -40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200, > >> + -37800, -37300, -36800, -36400, -36000, -35600, -35200, -34800, > >> + -34300, -33800, -33400, -33000, -32600, -32200, -31800, -31300, > >> + -30800, -30400, -30000, -29600, -29200, -28700, -28200, -27800, > >> + -27400, -27000, -26600, -26200, -25700, -25200, -24800, -24400, > >> + -24000, -23600, -23200, -22700, -22200, -21800, -21400, -21000, > >> + -20600, -20200, -19700, -19200, -18800, -18400, -18000, -17600, > >> + -17200, -16700, -16200, -15800, -15400, -15000, -14600, -14200, > >> + -13700, -13200, -12800, -12400, -12000, -11600, -11200, -10700, > >> + -10200, -9800, -9400, -9000, -8600, -8200, -7700, -7200, -6800, > >> + -6400, -6000, -5600, -5200, -4800, -4300, -3800, -3400, -3000, > >> + -2600, -2200, -1800, -1300, -800, -400, 0, 400, 800, 1200, 1600, > >> + 2100, 2600, 3000, 3400, 3800, 4200, 4600, 5100, 5600, 6000, 6400, > >> + 6800, 7200, 7600, 8000, 8500, 9000, 9400, 9800, 10200, 10600, 11000, > >> + 11400, 11900, 12400, 12800, 13200, 13600, 14000, 14400, 14800, > >> + 15300, 15800, 16200, 16600, 17000, 17400, 17800, 18200, 18700, > >> + 19200, 19600, 20000, 20400, 20800, 21200, 21600, 22100, 22600, > >> + 23000, 23400, 23800, 24200, 24600, 25000, 25400, 25900, 26400, > >> + 26800, 27200, 27600, 28000, 28400, 28800, 29300, 29800, 30200, > >> + 30600, 31000, 31400, 31800, 32200, 32600, 33100, 33600, 34000, > >> + 34400, 34800, 35200, 35600, 36000, 36400, 36800, 37300, 37800, > >> + 38200, 38600, 39000, 39400, 39800, 40200, 40600, 41100, 41600, > >> + 42000, 42400, 42800, 43200, 43600, 44000, 44400, 44800, 45300, > >> + 45800, 46200, 46600, 47000, 47400, 47800, 48200, 48600, 49000, > >> + 49500, 50000, 50400, 50800, 51200, 51600, 52000, 52400, 52800, > >> + 53200, 53700, 54200, 54600, 55000, 55400, 55800, 56200, 56600, > >> + 57000, 57400, 57800, 58200, 58700, 59200, 59600, 60000, 60400, > >> + 60800, 61200, 61600, 62000, 62400, 62800, 63300, 63800, 64200, > >> + 64600, 65000, 65400, 65800, 66200, 66600, 67000, 67400, 67800, > >> + 68200, 68700, 69200, 69600, 70000, 70400, 70800, 71200, 71600, > >> + 72000, 72400, 72800, 73200, 73600, 74100, 74600, 75000, 75400, > >> + 75800, 76200, 76600, 77000, 77400, 77800, 78200, 78600, 79000, > >> + 79400, 79800, 80300, 80800, 81200, 81600, 82000, 82400, 82800, > >> + 83200, 83600, 84000, 84400, 84800, 85200, 85600, 86000, 86400, > >> + 86800, 87300, 87800, 88200, 88600, 89000, 89400, 89800, 90200, > >> + 90600, 91000, 91400, 91800, 92200, 92600, 93000, 93400, 93800, > >> + 94200, 94600, 95000, 95500, 96000, 96400, 96800, 97200, 97600, > >> + 98000, 98400, 98800, 99200, 99600, 100000, 100400, 100800, 101200, > >> + 101600, 102000, 102400, 102800, 103200, 103600, 104000, 104400, > >> + 104800, 105200, 105600, 106100, 106600, 107000, 107400, 107800, > >> + 108200, 108600, 109000, 109400, 109800, 110200, 110600, 111000, > >> + 111400, 111800, 112200, 112600, 113000, 113400, 113800, 114200, > >> + 114600, 115000, 115400, 115800, 116200, 116600, 117000, 117400, > >> + 117800, 118200, 118600, 119000, 119400, 119800, 120200, 120600, > >> + 121000, 121400, 121800, 122200, 122600, 123000 > >> +}; > >> + > >> +static unsigned long omap_temp_sensor_readl(struct omap_temp_sensor > >> + *temp_sensor, u32 reg) > >> +{ > >> + return __raw_readl(temp_sensor->phy_base + reg); > >> +} > >> + > >> +static void omap_temp_sensor_writel(struct omap_temp_sensor *temp_sensor, > >> + u32 val, u32 reg) > >> +{ > >> + __raw_writel(val, (temp_sensor->phy_base + reg)); > >> +} > >> + > >> +static int adc_to_temp_conversion(int adc_val) > >> +{ > >> + return adc_to_temp[adc_val - OMAP_ADC_START_VALUE]; > >> +} > >> + > >> +static int temp_to_adc_conversion(long temp) > >> +{ > >> + int i; > >> + > >> + for (i = 0; i <= OMAP_ADC_END_VALUE - OMAP_ADC_START_VALUE; i++) > >> + if (temp < adc_to_temp[i]) > >> + return OMAP_ADC_START_VALUE + i - 1; > >> + > >> + return -EINVAL; > >> +} > >> + > >> +static void omap_configure_temp_sensor_thresholds(struct omap_temp_sensor > >> + *temp_sensor) > >> +{ > >> + u32 temp, t_hot, t_cold, tshut_hot, tshut_cold; > >> + > >> + t_hot = temp_to_adc_conversion(BGAP_THRESHOLD_T_HOT); > >> + t_cold = temp_to_adc_conversion(BGAP_THRESHOLD_T_COLD); > >> + > >> + /* Configure the TALERT thresholds */ > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_threshold); > >> + temp |= (t_hot << __ffs(temp_sensor->registers->threshold_thot_mask)) | > >> + (t_cold << __ffs(temp_sensor->registers->threshold_tcold_mask)); > >> + omap_temp_sensor_writel(temp_sensor, temp, > >> + temp_sensor->registers->bgap_threshold); > >> + > >> + tshut_hot = temp_to_adc_conversion(TSHUT_THRESHOLD_HOT); > >> + tshut_cold = temp_to_adc_conversion(TSHUT_THRESHOLD_COLD); > >> + > >> + /* Configure the TSHUT thresholds */ > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->thsut_threshold); > >> + temp |= (tshut_hot << __ffs(temp_sensor->registers->tshut_hot_mask)) > >> + | (tshut_cold << __ffs(temp_sensor->registers->tshut_hot_mask)); > >> + omap_temp_sensor_writel(temp_sensor, temp, > >> + temp_sensor->registers->thsut_threshold); > >> +} > >> + > >> +static void omap_configure_temp_sensor_counter(struct omap_temp_sensor > >> + *temp_sensor, u32 counter) > >> +{ > >> + u32 val; > >> + > >> + val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_counter); > >> + val &= ~(temp_sensor->registers->counter_mask); > >> + val |= (counter << __ffs(temp_sensor->registers->counter_mask)); > >> + omap_temp_sensor_writel(temp_sensor, val, > >> + temp_sensor->registers->bgap_counter); > >> +} > >> + > >> +static void omap_enable_continuous_mode(struct omap_temp_sensor *temp_sensor, > >> + bool enable) > >> +{ > >> + u32 val; > >> + > >> + val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_mode_ctrl); > >> + > >> + if (enable) > >> + val |= (1 << __ffs(temp_sensor->registers->mode_ctrl_mask)); > >> + else > >> + val &= ~(temp_sensor->registers->mode_ctrl_mask); > >> + > >> + omap_temp_sensor_writel(temp_sensor, val, > >> + temp_sensor->registers->bgap_mode_ctrl); > >> +} > >> + > >> +/* Sysfs hook functions */ > >> + > >> +static ssize_t show_temp_max(struct device *dev, > >> + struct device_attribute *devattr, char *buf) > >> +{ > >> + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); > >> + int temp; > >> + > >> + mutex_lock(&temp_sensor->sensor_mutex); > >> + > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_threshold); > >> + temp = (temp & temp_sensor->registers->threshold_thot_mask) > >> + >> __ffs(temp_sensor->registers->threshold_thot_mask); > >> + > >> + if (temp < OMAP_ADC_START_VALUE || temp > OMAP_ADC_END_VALUE) { > >> + dev_err(dev, "invalid value\n"); > >> + goto out; > >> + } > >> + temp = adc_to_temp_conversion(temp); > >> + > >> +out: > >> + mutex_unlock(&temp_sensor->sensor_mutex); > >> + > >> + return snprintf(buf, 16, "%d\n", temp); > >> +} > >> + > >> +static ssize_t set_temp_max(struct device *dev, > >> + struct device_attribute *devattr, > >> + const char *buf, size_t count) > >> +{ > >> + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); > >> + long val; > >> + u32 reg_val, t_cold, t_hot, temp; > >> + > >> + mutex_lock(&temp_sensor->sensor_mutex); > >> + > >> + if (strict_strtol(buf, 10, &val)) { > >> + count = -EINVAL; > >> + goto out; > >> + } > >> + > >> + t_hot = temp_to_adc_conversion(val); > >> + if ((t_hot < OMAP_ADC_START_VALUE || t_hot > OMAP_ADC_END_VALUE)) { > >> + dev_err(dev, "invalid range\n"); > >> + count = -EINVAL; > >> + goto out; > >> + } > >> + > >> + /* obtain the T cold value */ > >> + t_cold = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_threshold); > >> + t_cold = (t_cold & temp_sensor->registers->threshold_tcold_mask) >> > >> + __ffs(temp_sensor->registers->threshold_tcold_mask); > >> + > >> + if (t_hot < t_cold) { > >> + dev_err(dev, "Error! T_HOT value lesser than T_COLD\n"); > >> + count = -EINVAL; > >> + goto out; > >> + } > >> + > >> + /* write the new t_hot value */ > >> + reg_val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_threshold); > >> + reg_val &= ~(temp_sensor->registers->threshold_thot_mask); > >> + reg_val |= (t_hot << > >> + __ffs(temp_sensor->registers->threshold_thot_mask)); > >> + omap_temp_sensor_writel(temp_sensor, reg_val, > >> + temp_sensor->registers->bgap_threshold); > >> + > >> + /* Read the current temperature */ > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->temp_sensor_ctrl); > >> + temp &= (temp_sensor->registers->bgap_dtemp_mask); > >> + > >> + /* > >> + * If user sets the HIGH threshold(t_hot) greater than the current > >> + * temperature(temp) unmask the HOT interrupts > >> + */ > >> + if (t_hot > temp) { > >> + reg_val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_mask_ctrl); > >> + reg_val &= ~(temp_sensor->registers->mask_cold_mask); > >> + reg_val |= temp_sensor->registers->mask_hot_mask; > >> + omap_temp_sensor_writel(temp_sensor, reg_val, > >> + temp_sensor->registers->bgap_mask_ctrl); > >> + } > >> + > >> + /* > >> + * If current temperature is in-between the hot and cold thresholds, > >> + * Enable both masks. > >> + */ > >> + if (temp > t_cold && temp < t_hot) { > >> + reg_val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_mask_ctrl); > >> + reg_val |= temp_sensor->registers->mask_cold_mask; > >> + reg_val |= temp_sensor->registers->mask_hot_mask; > >> + omap_temp_sensor_writel(temp_sensor, reg_val, > >> + OMAP4460_BGAP_CTRL_OFFSET); > >> + } > >> + /* > >> + * else no need to do anything since HW will immediately compare > >> + * the new threshold and generate interrupt accordingly > >> + */ > >> +out: > >> + mutex_unlock(&temp_sensor->sensor_mutex); > >> + return count; > >> +} > >> + > >> +static ssize_t show_temp_max_hyst(struct device *dev, > >> + struct device_attribute *devattr, char *buf) > >> +{ > >> + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); > >> + u32 temp; > >> + > >> + mutex_lock(&temp_sensor->sensor_mutex); > >> + > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_threshold); > >> + temp = (temp & temp_sensor->registers->threshold_tcold_mask) >> > >> + __ffs(temp_sensor->registers->threshold_tcold_mask); > >> + > >> + if (temp < OMAP_ADC_START_VALUE || temp > OMAP_ADC_END_VALUE) { > >> + dev_err(dev, "invalid value\n"); > >> + goto out; > >> + } > >> + > >> + temp = adc_to_temp_conversion(temp); > >> +out: > >> + mutex_unlock(&temp_sensor->sensor_mutex); > >> + > >> + return snprintf(buf, 16, "%d\n", temp); > >> +} > >> + > >> +static ssize_t set_temp_max_hyst(struct device *dev, > >> + struct device_attribute *devattr, > >> + const char *buf, size_t count) > >> +{ > >> + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); > >> + u32 reg_val, t_hot, t_cold, temp; > >> + long val; > >> + > >> + mutex_lock(&temp_sensor->sensor_mutex); > >> + > >> + if (strict_strtol(buf, 10, &val)) { > >> + count = -EINVAL; > >> + goto out; > >> + } > >> + > >> + t_cold = temp_to_adc_conversion(val); > >> + if (t_cold < OMAP_ADC_START_VALUE || t_cold > OMAP_ADC_END_VALUE) { > >> + dev_err(dev, "invalid range"); > >> + count = -EINVAL; > >> + goto out; > >> + } > >> + > >> + /* obtain the T HOT value */ > >> + t_hot = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_threshold); > >> + t_hot = (t_hot & temp_sensor->registers->threshold_thot_mask) >> > >> + __ffs(temp_sensor->registers->threshold_thot_mask); > >> + > >> + if (t_cold > t_hot) { > >> + dev_err(dev, "Error! T_COLD value greater than T_HOT\n"); > >> + count = -EINVAL; > >> + goto out; > >> + } > >> + > >> + /* write the new t_cold value */ > >> + reg_val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_threshold); > >> + reg_val &= ~(temp_sensor->registers->threshold_tcold_mask); > >> + reg_val |= (t_cold << > >> + __ffs(temp_sensor->registers->threshold_tcold_mask)); > >> + omap_temp_sensor_writel(temp_sensor, reg_val, > >> + temp_sensor->registers->bgap_threshold); > >> + > >> + /* Read the current temperature */ > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->temp_sensor_ctrl); > >> + temp &= (temp_sensor->registers->bgap_dtemp_mask); > >> + > >> + /* > >> + * If user sets the LOW threshold(t_cold) lower than the current > >> + * temperature(temp) unmask the COLD interrupts > >> + */ > >> + if (t_cold < temp) { > >> + reg_val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_mask_ctrl); > >> + reg_val &= ~(temp_sensor->registers->mask_hot_mask); > >> + reg_val |= temp_sensor->registers->mask_cold_mask; > >> + omap_temp_sensor_writel(temp_sensor, reg_val, > >> + temp_sensor->registers->bgap_mask_ctrl); > >> + } > >> + > >> + /* > >> + * If current temperature is in-between the hot and cold thresholds, > >> + * Enable both masks. > >> + */ > >> + if (temp < t_hot && temp > t_cold) { > >> + reg_val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_mask_ctrl); > >> + reg_val |= temp_sensor->registers->mask_cold_mask; > >> + reg_val |= temp_sensor->registers->mask_hot_mask; > >> + omap_temp_sensor_writel(temp_sensor, reg_val, > >> + temp_sensor->registers->bgap_mask_ctrl); > >> + } > >> + > >> + /* > >> + * else no need to do anything since HW will immediately compare > >> + * the new threshold and generate interrupt accordingly > >> + */ > >> + > >> +out: > >> + mutex_unlock(&temp_sensor->sensor_mutex); > >> + return count; > >> +} > >> + > >> +static ssize_t show_update_rate(struct device *dev, > >> + struct device_attribute *devattr, char *buf) > >> +{ > >> + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); > >> + u32 temp = 0, ret = 0; > >> + > >> + mutex_lock(&temp_sensor->sensor_mutex); > >> + > >> + if (!temp_sensor->clk_rate) { > >> + dev_err(dev, "clk_rate is NULL\n"); > >> + ret = -EINVAL; > >> + goto out; > >> + } > >> + > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_counter); > >> + temp = (temp & temp_sensor->registers->counter_mask) >> > >> + __ffs(temp_sensor->registers->counter_mask); > > > > temp &= ?? > > > >> + temp = temp * 1000 / (temp_sensor->clk_rate); > > > > temp *= ?? > > Need to multiply the temp with 1000 before dividing. > temp *= evaluates the RHS first and then multiplies LHS. temp *= 1000; temp /= clk_rate; > >> +out: > >> + mutex_unlock(&temp_sensor->sensor_mutex); > >> + if (!ret) > >> + return sprintf(buf, "%d\n", temp); > >> + else > >> + return ret; > >> +} > >> + > >> +static ssize_t set_update_rate(struct device *dev, > >> + struct device_attribute *devattr, > >> + const char *buf, size_t count) > >> +{ > >> + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); > >> + u32 reg_val; > >> + long val; > >> + > >> + mutex_lock(&temp_sensor->sensor_mutex); > >> + > >> + if (strict_strtol(buf, 10, &val)) { > >> + count = -EINVAL; > >> + goto out; > >> + } > >> + > >> + val *= temp_sensor->clk_rate / 1000; > >> + reg_val = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_counter); > >> + > >> + reg_val &= ~(temp_sensor->registers->counter_mask); > >> + reg_val |= val; > >> + omap_temp_sensor_writel(temp_sensor, reg_val, > >> + temp_sensor->registers->bgap_counter); > >> + > >> +out: > >> + mutex_unlock(&temp_sensor->sensor_mutex); > >> + return count; > >> +} > >> + > >> +static int omap_temp_sensor_read_temp(struct device *dev, > >> + struct device_attribute *devattr, > >> + char *buf) > >> +{ > >> + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); > >> + int temp, ret = 0; > >> + > >> + mutex_lock(&temp_sensor->sensor_mutex); > >> + > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->temp_sensor_ctrl); > >> + temp &= temp_sensor->registers->bgap_dtemp_mask; > >> + > >> + if (!temp_sensor->is_efuse_valid) > >> + dev_err(dev, "Invalid EFUSE, Non-trimmed BGAP, Temp not accurate\n"); > >> + > >> + /* look up for temperature in the table and return the temperature */ > >> + if (temp < OMAP_ADC_START_VALUE || temp > OMAP_ADC_END_VALUE) { > >> + dev_err(dev, "invalid adc code reported %d", temp); > >> + ret = -EINVAL; > >> + goto out; > >> + } > >> + > >> + temp = adc_to_temp[temp - OMAP_ADC_START_VALUE]; > >> + > >> +out: > >> + mutex_unlock(&temp_sensor->sensor_mutex); > >> + if (!ret) > >> + return sprintf(buf, "%d\n", temp); > >> + else > >> + return ret; > >> +} > >> + > >> +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, omap_temp_sensor_read_temp, > >> + NULL, 0); > >> +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, > >> + set_temp_max, 0); > >> +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_max_hyst, > >> + set_temp_max_hyst, 0); > >> +static SENSOR_DEVICE_ATTR(update_rate, S_IWUSR | S_IRUGO, show_update_rate, > >> + set_update_rate, 0); > >> + > >> +static struct attribute *omap_temp_sensor_attributes[] = { > >> + &sensor_dev_attr_temp1_input.dev_attr.attr, > >> + &sensor_dev_attr_temp1_max.dev_attr.attr, > >> + &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, > >> + &sensor_dev_attr_update_rate.dev_attr.attr, > >> + NULL > >> +}; > >> + > >> +static const struct attribute_group omap_temp_sensor_group = { > >> + .attrs = omap_temp_sensor_attributes, > >> +}; > >> + > >> +static int omap_temp_sensor_clk_enable(struct omap_temp_sensor *temp_sensor) > >> +{ > >> + u32 ret = 0, temp; > >> + > >> + if (temp_sensor->clk_on) { > >> + dev_err(temp_sensor->hwmon_dev, "clock already on\n"); > >> + goto out; > >> + } > >> + > >> + ret = pm_runtime_get_sync(temp_sensor->hwmon_dev); > >> + if (ret < 0) { > >> + dev_err(temp_sensor->hwmon_dev, "get sync failed\n"); > >> + ret = -EINVAL; > >> + goto out; > >> + } > >> + > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->temp_sensor_ctrl); > >> + temp &= ~(temp_sensor->registers->bgap_tempsoff_mask); > >> + /* BGAP_TEMPSOFF should be reset to 0 */ > >> + omap_temp_sensor_writel(temp_sensor, temp, > >> + temp_sensor->registers->temp_sensor_ctrl); > >> + temp_sensor->clk_on = 1; > > > > why isn't pm_runtime_get_sync() enough ?? > > This is the programming sequence indicated. BGAP_TEMPSOFF should be set > to 0 to enable the temperature sensor. why isn't this done as part of your runtime_resume() function ?? > >> +out: > >> + return ret; > >> +} > >> + > >> +static int omap_temp_sensor_clk_disable(struct omap_temp_sensor *temp_sensor) > >> +{ > >> + u32 temp, ret = 0; > >> + unsigned long timeout; > >> + > >> + if (!temp_sensor->clk_on) { > >> + dev_err(temp_sensor->hwmon_dev, "clock already off\n"); > >> + goto out; > >> + } > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->temp_sensor_ctrl); > >> + temp |= temp_sensor->registers->bgap_tempsoff_mask; > >> + > >> + /* BGAP_TEMPSOFF should be set to 1 before gating clock */ > >> + omap_temp_sensor_writel(temp_sensor, temp, > >> + temp_sensor->registers->temp_sensor_ctrl); > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_status); > >> + timeout = jiffies + msecs_to_jiffies(5); > >> + > >> + /* wait till the clean stop bit is set or till the timeout exppires */ > >> + while (!(temp | temp_sensor->registers->status_clean_stop_mask) && > >> + !(time_after(jiffies, timeout))) { > >> + temp = omap_temp_sensor_readl(temp_sensor, > >> + temp_sensor->registers->bgap_status); > >> + usleep_range(500, 2000); > >> + } > >> + > >> + if (time_after(jiffies, timeout)) > >> + dev_err(temp_sensor->hwmon_dev, "Clean stop bit not set\n"); > >> + /* Gate the clock */ > >> + ret = pm_runtime_put_sync(temp_sensor->hwmon_dev); > >> + if (ret < 0) { > >> + dev_err(temp_sensor->hwmon_dev, "put sync failed\n"); > >> + ret = -EINVAL; > >> + goto out; > >> + } > >> + temp_sensor->clk_on = 0; > >> +out: > >> + return ret; > >> +} add a blank line here. -- balbi
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