Re: [RFC PATCH 6/6 V2] hwmon: OMAP4: On die temperature sensor driver

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On Fri, Aug 19, 2011 at 11:34 AM, J, KEERTHY <j-keerthy@xxxxxx> wrote:
> On Fri, Aug 19, 2011 at 7:43 AM, Guenter Roeck
> <guenter.roeck@xxxxxxxxxxxx> wrote:
>> On Thu, Aug 18, 2011 at 06:52:15AM -0400, 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>
>>> Cc: Jean Delvare <khali@xxxxxxxxxxxx>
>>> Cc: Guenter Roeck <guenter.roeck@xxxxxxxxxxxx>
>>> Cc: lm-sensors@xxxxxxxxxxxxxx
>>
>> High level review:
>>
>> - too much and too broad mutex locking. show functions should not need locks at all,
>>  set functions only while data is written into registers and into platform data.
>
> Ok. I will clean this.
>
>> - driver is quite noisy. There should definitely not be any log messages
>>  if a set parameter is wrong. Show functions already return an error value
>>  to the user; a log message indicating the error again just creates noise.
>>  For one boolean set during probe (is_efuse_valid), each subsequent show results
>>  in a log message if it is false. Some errors result in multiple log messages.
>
> A user tries to set an invalid temperature threshold. The user should
> be notified about this. The invalid temperature will not be set. The user
> should not be allowed to set an invalid temperature. It is to inform
> the user about precisely the problem with the parameter.
>
> In some of the samples the bandgap is not trimmed and hence
> temperature reported will be wrong. So every time a user tries to read
> he is alerted that the temperatures are not accurate.
>
>> - Wrong use of EINVAL throughout the driver (EINVAL is "Invalid Argument")
>
> Ok. I will correct this.

When the temperature is out of range can i return -EDOM?
Any suggestions?

>
>> - excessive ( )
>
> Ok.
>
>> - linear search through a sorted array is very expensive. Consider using a binary search.
>
> Yes. I will implement binary search.
>
>> - temp_to_adc_conversion return code (error if negative) is not checked properly.
>
> Ok. I will add checks.
>
>>
>> I am sure there are other problems, but those are difficult to find with all the noise
>> above.
>>
>> Guenter
>>
>>> ---
>>>  Documentation/hwmon/omap_temp_sensor |   27 +
>>>  drivers/hwmon/Kconfig                |   11 +
>>>  drivers/hwmon/Makefile               |    1 +
>>>  drivers/hwmon/omap_temp_sensor.c     |  918 ++++++++++++++++++++++++++++++++++
>>>  4 files changed, 957 insertions(+), 0 deletions(-)
>>>  create mode 100644 Documentation/hwmon/omap_temp_sensor
>>>  create mode 100644 drivers/hwmon/omap_temp_sensor.c
>>>
>>> diff --git a/Documentation/hwmon/omap_temp_sensor b/Documentation/hwmon/omap_temp_sensor
>>> new file mode 100644
>>> index 0000000..e01a6d6
>>> --- /dev/null
>>> +++ b/Documentation/hwmon/omap_temp_sensor
>>> @@ -0,0 +1,27 @@
>>> +Kernel driver omap_temp_sensor
>>> +==============================
>>> +
>>> +Supported chips:
>>> +  * Texas Instruments OMAP4460
>>> +    Prefix: 'omap_temp_sensor'
>>> +    Datasheet: http://focus.ti.com/docs/prod/folders/print/tmp102.html
>>> +
>>> +Author:
>>> +        J Keerthy <j-keerthy@xxxxxx>
>>> +
>>> +Description
>>> +-----------
>>> +
>>> +The Texas Instruments OMAP4 family of chips have a bandgap temperature sensor.
>>> +The temperature sensor feature is used to convert the temperature of the device
>>> +into a decimal value coded on 10 bits. An internal ADC is used for conversion.
>>> +The recommended operating temperatures must be in the range -40 degree Celsius
>>> +to 123 degree celsius for standard conversion.
>>> +The thresholds are programmable and upon crossing the thresholds an interrupt
>>> +is generated. The OMAP temperature sensor has a programmable update rate in
>>> +milli seconds.
>>> +(Currently the driver programs a default of 2000 milli seconds).
>>> +
>>> +The driver provides the common sysfs-interface for temperatures (see
>>> +Documentation/hwmon/sysfs-interface under Temperatures).
>>> +
>>> 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..586a361
>>> --- /dev/null
>>> +++ b/drivers/hwmon/omap_temp_sensor.c
>>> @@ -0,0 +1,918 @@
>>> +/*
>>> + * 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>
>>> +#include <linux/io.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/init.h>
>>> +#include <plat/omap_device.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 <linux/delay.h>
>>> +#include <plat/temperature_sensor.h>
>>> +
>>> +#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");
>>> +               mutex_unlock(&temp_sensor->sensor_mutex);
>>> +               return -EINVAL;
>>> +       }
>>> +
>>> +       temp = adc_to_temp_conversion(temp);
>>> +       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");
>>> +               mutex_unlock(&temp_sensor->sensor_mutex);
>>> +               return -EINVAL;
>>> +       }
>>> +
>>> +       temp = adc_to_temp_conversion(temp);
>>> +       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 * 1000 / (temp_sensor->clk_rate);
>>> +
>>> +out:
>>> +       mutex_unlock(&temp_sensor->sensor_mutex);
>>> +       if (!ret)
>>> +               return sprintf(buf, "%d\n", temp);
>>> +
>>> +       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);
>>> +
>>> +       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;
>>> +
>>> +       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");
>>> +               goto out;
>>> +       }
>>> +
>>> +       temp_sensor->clk_on = 1;
>>> +
>>> +out:
>>> +       return ret;
>>> +}
>>> +
>>> +static int omap_temp_sensor_clk_disable(struct omap_temp_sensor *temp_sensor)
>>> +{
>>> +       u32 ret = 0;
>>> +
>>> +       if (!temp_sensor->clk_on) {
>>> +               dev_err(temp_sensor->hwmon_dev, "clock already off\n");
>>> +               goto out;
>>> +       }
>>> +
>>> +       /* 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");
>>> +               goto out;
>>> +       }
>>> +       temp_sensor->clk_on = 0;
>>> +
>>> +out:
>>> +       return ret;
>>> +}
>>> +
>>> +static irqreturn_t omap_talert_irq_handler(int irq, void *data)
>>> +{
>>> +       struct omap_temp_sensor         *temp_sensor;
>>> +       int                             t_hot, t_cold, temp;
>>> +
>>> +       temp_sensor = data;
>>> +       mutex_lock(&temp_sensor->sensor_mutex);
>>> +
>>> +       /* Read the status of t_hot */
>>> +       t_hot = omap_temp_sensor_readl(temp_sensor,
>>> +                       temp_sensor->registers->bgap_status)
>>> +                       & temp_sensor->registers->status_hot_mask;
>>> +
>>> +       /* Read the status of t_cold */
>>> +       t_cold = omap_temp_sensor_readl(temp_sensor,
>>> +                       temp_sensor->registers->bgap_status)
>>> +                       & temp_sensor->registers->status_cold_mask;
>>> +
>>> +       temp = omap_temp_sensor_readl(temp_sensor,
>>> +                       temp_sensor->registers->bgap_mask_ctrl);
>>> +       /*
>>> +        * One TALERT interrupt: Two sources
>>> +        * If the interrupt is due to t_hot then mask t_hot and
>>> +        * and unmask t_cold else mask t_cold and unmask t_hot
>>> +        */
>>> +       if (t_hot) {
>>> +               temp &= ~(temp_sensor->registers->mask_hot_mask);
>>> +               temp |= temp_sensor->registers->mask_cold_mask;
>>> +       } else if (t_cold) {
>>> +               temp &= ~(temp_sensor->registers->mask_cold_mask);
>>> +               temp |= temp_sensor->registers->mask_hot_mask;
>>> +       }
>>> +
>>> +       omap_temp_sensor_writel(temp_sensor, temp,
>>> +               temp_sensor->registers->bgap_mask_ctrl);
>>> +
>>> +       /* kobject_uvent to user space telling thermal threshold crossed */
>>> +       kobject_uevent(&temp_sensor->hwmon_dev->kobj, KOBJ_CHANGE);
>>> +
>>> +       mutex_unlock(&temp_sensor->sensor_mutex);
>>> +
>>> +       return IRQ_HANDLED;
>>> +}
>>> +
>>> +static int __devinit omap_temp_sensor_probe(struct platform_device *pdev)
>>> +{
>>> +       struct omap_temp_sensor_pdata   *pdata  = pdev->dev.platform_data;
>>> +       struct omap_temp_sensor         *temp_sensor;
>>> +       struct resource                 *mem;
>>> +       int                             ret = 0;
>>> +       int                             val, clk_rate;
>>> +
>>> +       if (!pdata) {
>>> +               dev_err(&pdev->dev, "platform data missing\n");
>>> +               return -EINVAL;
>>> +       }
>>> +
>>> +       temp_sensor = kzalloc(sizeof(*temp_sensor), GFP_KERNEL);
>>> +       if (!temp_sensor)
>>> +               return -ENOMEM;
>>> +
>>> +       mutex_init(&temp_sensor->sensor_mutex);
>>> +
>>> +       mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>> +       if (!mem) {
>>> +               dev_err(&pdev->dev, "no mem resource\n");
>>> +               ret = -ENOMEM;
>>> +               goto plat_res_err;
>>> +       }
>>> +
>>> +       temp_sensor->irq = platform_get_irq_byname(pdev, "thermal_alert");
>>> +       if (temp_sensor->irq < 0) {
>>> +               dev_err(&pdev->dev, "get_irq_byname failed\n");
>>> +               ret = temp_sensor->irq;
>>> +               goto plat_res_err;
>>> +       }
>>> +
>>> +       temp_sensor->phy_base = ioremap(mem->start, resource_size(mem));
>>> +       temp_sensor->clock = NULL;
>>> +       temp_sensor->registers = pdata->registers;
>>> +       temp_sensor->hwmon_dev = &pdev->dev;
>>> +
>>> +       pm_runtime_enable(&pdev->dev);
>>> +       pm_runtime_irq_safe(&pdev->dev);
>>> +
>>> +       /*
>>> +        * check if the efuse has a non-zero value if not
>>> +        * it is an untrimmed sample and the temperatures
>>> +        * may not be accurate
>>> +        */
>>> +
>>> +       if (omap_temp_sensor_readl(temp_sensor,
>>> +                       temp_sensor->registers->bgap_efuse))
>>> +               temp_sensor->is_efuse_valid = 1;
>>> +
>>> +       platform_set_drvdata(pdev, temp_sensor);
>>> +       dev_set_drvdata(&pdev->dev, temp_sensor);
>>> +       temp_sensor->clock = clk_get(temp_sensor->hwmon_dev, "fck");
>>> +       if (IS_ERR(temp_sensor->clock)) {
>>> +               ret = PTR_ERR(temp_sensor->clock);
>>> +               dev_err(temp_sensor->hwmon_dev,
>>> +                       "unable to get fclk: %d\n", ret);
>>> +               ret = -EINVAL;
>>> +               goto plat_res_err;
>>> +       }
>>> +
>>> +       ret = omap_temp_sensor_clk_enable(temp_sensor);
>>> +       if (ret) {
>>> +               dev_err(&pdev->dev, "Cannot enable temp sensor\n");
>>> +               goto clken_err;
>>> +       }
>>> +
>>> +       clk_rate = clk_round_rate(temp_sensor->clock, 2000000);
>>> +       if (clk_rate < 1000000 || clk_rate == 0xffffffff) {
>>> +               dev_err(&pdev->dev, "Error round rate\n");
>>> +               ret = -EINVAL;
>>> +               goto clken_err;
>>> +       }
>>> +
>>> +       ret = clk_set_rate(temp_sensor->clock, clk_rate);
>>> +       if (ret) {
>>> +               dev_err(&pdev->dev, "Cannot set clock rate\n");
>>> +               goto clken_err;
>>> +       }
>>> +
>>> +       temp_sensor->clk_rate = clk_rate;
>>> +       omap_enable_continuous_mode(temp_sensor, 1);
>>> +       omap_configure_temp_sensor_thresholds(temp_sensor);
>>> +       /* 1 ms */
>>> +       omap_configure_temp_sensor_counter(temp_sensor, 1);
>>> +
>>> +       /* Wait till the first conversion is done wait for at least 1ms */
>>> +       usleep_range(1000, 2000);
>>> +
>>> +       /* Read the temperature once due to hw issue*/
>>> +       omap_temp_sensor_readl(temp_sensor,
>>> +                       temp_sensor->registers->temp_sensor_ctrl);
>>> +
>>> +       /* Set 2 seconds time as default counter */
>>> +       omap_configure_temp_sensor_counter(temp_sensor,
>>> +                                               temp_sensor->clk_rate * 2);
>>> +
>>> +       temp_sensor->hwmon_dev = hwmon_device_register(&pdev->dev);
>>> +       if (IS_ERR(temp_sensor->hwmon_dev)) {
>>> +               dev_err(&pdev->dev, "hwmon_device_register failed.\n");
>>> +               ret = PTR_ERR(temp_sensor->hwmon_dev);
>>> +               goto hwmon_reg_err;
>>> +       }
>>> +
>>> +       ret = sysfs_create_group(&pdev->dev.kobj,
>>> +                                &omap_temp_sensor_group);
>>> +       if (ret) {
>>> +               dev_err(&pdev->dev, "could not create sysfs files\n");
>>> +               goto sysfs_create_err;
>>> +       }
>>> +
>>> +       kobject_uevent(&temp_sensor->hwmon_dev->kobj, KOBJ_ADD);
>>> +
>>> +       ret = request_threaded_irq(temp_sensor->irq, NULL,
>>> +               omap_talert_irq_handler, IRQF_TRIGGER_RISING | IRQF_ONESHOT,
>>> +                       "temp_sensor", temp_sensor);
>>> +       if (ret) {
>>> +               dev_err(&pdev->dev, "Request threaded irq failed.\n");
>>> +               goto req_irq_err;
>>> +       }
>>> +
>>> +       /* unmask the T_COLD and unmask T_HOT at init */
>>> +       val = omap_temp_sensor_readl(temp_sensor,
>>> +               temp_sensor->registers->bgap_mask_ctrl);
>>> +       val |= temp_sensor->registers->mask_cold_mask
>>> +               | temp_sensor->registers->mask_hot_mask;
>>> +
>>> +       omap_temp_sensor_writel(temp_sensor, val,
>>> +               temp_sensor->registers->bgap_mask_ctrl);
>>> +
>>> +       return 0;
>>> +
>>> +req_irq_err:
>>> +       kobject_uevent(&temp_sensor->hwmon_dev->kobj, KOBJ_REMOVE);
>>> +       sysfs_remove_group(&temp_sensor->hwmon_dev->kobj,
>>> +                               &omap_temp_sensor_group);
>>> +sysfs_create_err:
>>> +       hwmon_device_unregister(&pdev->dev);
>>> +hwmon_reg_err:
>>> +       omap_temp_sensor_clk_disable(temp_sensor);
>>> +clken_err:
>>> +       clk_put(temp_sensor->clock);
>>> +plat_res_err:
>>> +       mutex_destroy(&temp_sensor->sensor_mutex);
>>> +       kfree(temp_sensor);
>>> +       return ret;
>>> +}
>>> +
>>> +static int __devexit omap_temp_sensor_remove(struct platform_device *pdev)
>>> +{
>>> +       struct omap_temp_sensor *temp_sensor = platform_get_drvdata(pdev);
>>> +
>>> +       hwmon_device_unregister(&pdev->dev);
>>> +       kobject_uevent(&temp_sensor->hwmon_dev->kobj, KOBJ_REMOVE);
>>> +       sysfs_remove_group(&temp_sensor->hwmon_dev->kobj,
>>> +                       &omap_temp_sensor_group);
>>> +       omap_temp_sensor_clk_disable(temp_sensor);
>>> +       clk_put(temp_sensor->clock);
>>> +       platform_set_drvdata(pdev, NULL);
>>> +       free_irq(temp_sensor->irq, temp_sensor);
>>> +       mutex_destroy(&temp_sensor->sensor_mutex);
>>> +       kfree(temp_sensor);
>>> +
>>> +       return 0;
>>> +}
>>> +
>>> +#ifdef CONFIG_PM
>>> +static void omap_temp_sensor_save_ctxt(struct omap_temp_sensor *temp_sensor)
>>> +{
>>> +       temp_sensor->temp_sensor_ctrl = omap_temp_sensor_readl(temp_sensor,
>>> +               temp_sensor->registers->temp_sensor_ctrl);
>>> +       temp_sensor->bg_ctrl = omap_temp_sensor_readl(temp_sensor,
>>> +               temp_sensor->registers->bgap_mask_ctrl);
>>> +       temp_sensor->bg_counter = omap_temp_sensor_readl(temp_sensor,
>>> +               temp_sensor->registers->bgap_counter);
>>> +       temp_sensor->bg_threshold = omap_temp_sensor_readl(temp_sensor,
>>> +               temp_sensor->registers->bgap_threshold);
>>> +       temp_sensor->temp_sensor_tshut_threshold =
>>> +               omap_temp_sensor_readl(temp_sensor,
>>> +               temp_sensor->registers->thsut_threshold);
>>> +}
>>> +
>>> +static void omap_temp_sensor_restore_ctxt(struct omap_temp_sensor *temp_sensor)
>>> +{
>>> +       omap_temp_sensor_writel(temp_sensor,
>>> +                               temp_sensor->temp_sensor_ctrl,
>>> +                               temp_sensor->registers->temp_sensor_ctrl);
>>> +       omap_temp_sensor_writel(temp_sensor,
>>> +                               temp_sensor->bg_ctrl,
>>> +                               temp_sensor->registers->bgap_mask_ctrl);
>>> +       omap_temp_sensor_writel(temp_sensor,
>>> +                               temp_sensor->bg_counter,
>>> +                               temp_sensor->registers->bgap_counter);
>>> +       omap_temp_sensor_writel(temp_sensor,
>>> +                               temp_sensor->bg_threshold,
>>> +                               temp_sensor->registers->bgap_threshold);
>>> +       omap_temp_sensor_writel(temp_sensor,
>>> +                               temp_sensor->temp_sensor_tshut_threshold,
>>> +                               temp_sensor->registers->thsut_threshold);
>>> +}
>>> +
>>> +static int omap_temp_sensor_suspend(struct device *dev)
>>> +{
>>> +       struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev);
>>> +
>>> +       omap_temp_sensor_save_ctxt(temp_sensor);
>>> +
>>> +       return 0;
>>> +}
>>> +
>>> +static int omap_temp_sensor_resume(struct device *dev)
>>> +{
>>> +       struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev);
>>> +
>>> +       omap_temp_sensor_restore_ctxt(temp_sensor);
>>> +
>>> +       return 0;
>>> +}
>>> +
>>> +static int omap_temp_sensor_runtime_suspend(struct device *dev)
>>> +{
>>> +       struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev);
>>> +
>>> +       omap_temp_sensor_save_ctxt(temp_sensor);
>>> +
>>> +       return 0;
>>> +}
>>> +
>>> +static int omap_temp_sensor_runtime_resume(struct device *dev)
>>> +{
>>> +       static int context_loss_count;
>>> +       int temp;
>>> +       struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev);
>>> +
>>> +       temp = omap_device_get_context_loss_count(to_platform_device(dev));
>>> +
>>> +       if (temp != context_loss_count && context_loss_count != 0)
>>> +               omap_temp_sensor_restore_ctxt(temp_sensor);
>>> +
>>> +       context_loss_count = temp;
>>> +
>>> +       return 0;
>>> +}
>>> +
>>> +static const struct dev_pm_ops omap_temp_sensor_dev_pm_ops = {
>>> +       .suspend = omap_temp_sensor_suspend,
>>> +       .resume = omap_temp_sensor_resume,
>>> +       .runtime_suspend = omap_temp_sensor_runtime_suspend,
>>> +       .runtime_resume = omap_temp_sensor_runtime_resume,
>>> +};
>>> +
>>> +#endif
>>> +
>>> +static struct platform_driver omap_temp_sensor_driver = {
>>> +       .probe = omap_temp_sensor_probe,
>>> +       .remove = omap_temp_sensor_remove,
>>> +       .driver = {
>>> +                       .name = "omap_temp_sensor",
>>> +#ifdef CONFIG_PM
>>> +                       .pm = &omap_temp_sensor_dev_pm_ops,
>>> +#endif
>>> +                  },
>>> +};
>>> +
>>> +int __init omap_temp_sensor_init(void)
>>> +{
>>> +       return platform_driver_register(&omap_temp_sensor_driver);
>>> +}
>>> +module_init(omap_temp_sensor_init);
>>> +
>>> +static void __exit omap_temp_sensor_exit(void)
>>> +{
>>> +       platform_driver_unregister(&omap_temp_sensor_driver);
>>> +}
>>> +module_exit(omap_temp_sensor_exit);
>>> +
>>> +MODULE_DESCRIPTION("OMAP446X temperature sensor Driver");
>>> +MODULE_LICENSE("GPL");
>>> +MODULE_ALIAS("platform:" DRIVER_NAME);
>>> +MODULE_AUTHOR("J Keerthy <j-keerthy@xxxxxx>");
>>> --
>>> 1.7.0.4
>>>
>>
>
>
>
> --
> Regards and Thanks,
> Keerthy
>



-- 
Regards and Thanks,
Keerthy

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