On Thu, Sep 1, 2011 at 6:06 AM, Paul Walmsley <paul@xxxxxxxxx> wrote:
> Hi
>
> Some comments.
>
> On Wed, 31 Aug 2011, Keerthy wrote:
>
>> diff --git a/drivers/hwmon/omap_temp_sensor.c b/drivers/hwmon/omap_temp_sensor.c
>> new file mode 100644
>> index 0000000..67fa424
>> --- /dev/null
>> +++ b/drivers/hwmon/omap_temp_sensor.c
>> @@ -0,0 +1,881 @@
>
> You've done almost all the hard work to create kerneldoc-NANO compliant
> structure documentation, which is good. But a few important things are
> missing. Please review Documentation/kernel-doc-nano-HOWTO.txt.
Ok
>
>> +/*
>
> Should be /** to indicate kerneldoc.
Ok
>
>> + * omap_temp_sensor structure
>
> Should be "struct omap_temp_sensor" and should include a short
> description.
Ok
>
>> + * @hwmon_dev - hwmon device pointer
>> + * @pdev_dev - platform 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
>> + * @clk_on - Manages the current clock state
>> + */
>
>> +struct omap_temp_sensor {
>> + struct device *hwmon_dev;
>> + struct device *pdev_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 clk_on;
>> +};
>> +
>> +/*
>> + * Temperature values in milli degree celsius
>> + * ADC code values from 530 to 923
>> + */
>> +static int adc_to_temp[394] = {
>> + -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);
>> +}
>
> These are all SCM register accesses and need to go through a SCM driver.
Accessing SCM registers using ctrl_ functions?
>
>> +
>> +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 high, low, mid;
>> +
>> + if (temp < adc_to_temp[0] ||
>> + temp > adc_to_temp[OMAP_ADC_END_VALUE - OMAP_ADC_START_VALUE])
>> + return -EINVAL;
>> +
>> + high = OMAP_ADC_END_VALUE - OMAP_ADC_START_VALUE;
>> + low = 0;
>> + mid = (high + low) / 2;
>> +
>> + while (low < high) {
>> + if (temp < adc_to_temp[mid])
>> + high = mid - 1;
>> + else
>> + low = mid + 1;
>> + mid = (low + high) / 2;
>> + }
>> +
>> + return OMAP_ADC_START_VALUE + low;
>> +}
>> +
>> +static void omap_configure_temp_sensor_counter(struct omap_temp_sensor
>> + *temp_sensor, u32 counter)
>
> It doesn't seem necessary to include 'omap' in all these static function names.
>
Ok
>> +{
>> + 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)
>> +{
>> + u32 val;
>> +
>> + val = omap_temp_sensor_readl(temp_sensor,
>> + temp_sensor->registers->bgap_mode_ctrl);
>> +
>> + val |= 1 << __ffs(temp_sensor->registers->mode_ctrl_mask);
>> +
>> + omap_temp_sensor_writel(temp_sensor, val,
>> + temp_sensor->registers->bgap_mode_ctrl);
>> +}
>> +
>> +static void omap_temp_sensor_unmask_interrupts(struct omap_temp_sensor
>> + *temp_sensor, u8 hot, u8 cold)
>
> Your earlier static function names didn't include 'temp_sensor', but
> this one does. I'd suggest picking a standard function naming scheme
> and sticking to it.
Ok
>
>> +{
>> + u32 reg_val;
>> +
>> + reg_val = omap_temp_sensor_readl(temp_sensor,
>> + temp_sensor->registers->bgap_mask_ctrl);
>> + if (hot)
>> + reg_val |= temp_sensor->registers->mask_hot_mask;
>> + else
>> + reg_val &= ~temp_sensor->registers->mask_hot_mask;
>> +
>> + if (cold)
>> + reg_val |= temp_sensor->registers->mask_cold_mask;
>> + else
>> + reg_val &= ~temp_sensor->registers->mask_cold_mask;
>> +
>> + omap_temp_sensor_writel(temp_sensor, reg_val,
>> + temp_sensor->registers->bgap_mask_ctrl);
>> +}
>> +
>> +static void add_hyst(int adc_val, int hyst_val, int *thresh_val)
>> +{
>> + int temp = adc_to_temp_conversion(adc_val);
>> +
>> + temp += hyst_val;
>> +
>> + *thresh_val = temp_to_adc_conversion(temp);
>> +}
>> +
>> +static void omap_temp_sensor_configure_thresholds_mask(struct omap_temp_sensor
>> + *temp_sensor, bool set_hot, bool set_cold, int t_hot, int t_cold)
>
> Is there some reason why you don't just define a
>
> omap_temp_sensor_configure_hot_threshold()
>
> and
>
> omap_temp_sensor_configure_cold_threshold()
>
> ?
>
> Seems like that would be much more straightforward and would allow the
> removal of those set_{hot,cold} arguments.
Kept everything in one function. I can split it into separate functions.
>
>> +{
>> + int reg_val, cold, hot, temp;
>
> This function is really big and should be split up into several smaller
> functions. Common code should be shared if possible.
Ok
>
>> +
>> + if (set_hot) {
>> + /* obtain the T cold value */
>> + cold = omap_temp_sensor_readl(temp_sensor,
>> + temp_sensor->registers->bgap_threshold);
>> + cold = (cold & temp_sensor->registers->threshold_tcold_mask)
>> + >> __ffs(temp_sensor->registers->threshold_tcold_mask);
>
> This code should be hoisted up above the if statements. Only a single
> device read should be necessary to fetch both the hot and cold values.
> Then the near-duplicate code below to read the hot temperature can be
> removed.
>
> In fact, given that this patch has almost the same code several times,
> you should just put it into a static function or two and remove the
> duplicate code.
Ok. I will remove the duplicate code.
>
>> +
>> + if (t_hot < cold) {
>> + /* change the t_cold to t_hot - 5000 millidegrees */
>> + add_hyst(t_hot, NEG_HYST_VAL, &cold);
>> + /* 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 |= cold <<
>> + __ffs(temp_sensor->registers->threshold_tcold_mask);
>
> Looks like there are some indentation problems here. Those are more
> important than 80-column issues.
>
Ok
> Of course, you use temp_sensor->registers so much in this function, that
> many of the line length issues would go away if you used a shorter
> abbreviation at the beginning of this function, like:
>
> tsr = temp_sensor->registers;
Sure. Makes the code look neat.
>
>> + omap_temp_sensor_writel(temp_sensor, reg_val,
>> + temp_sensor->registers->bgap_threshold);
>> + t_cold = cold;
>> + }
>> +
>> + /* 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);
>> + }
>> +
>> + if (set_cold) {
>> + /* obtain the T HOT value */
>> + hot = omap_temp_sensor_readl(temp_sensor,
>> + temp_sensor->registers->bgap_threshold);
>> + hot = (hot & temp_sensor->registers->threshold_thot_mask) >>
>> + __ffs(temp_sensor->registers->threshold_thot_mask);
>
> See the earlier comment about hoisting.
Ok
>
>> + if (t_cold > hot) {
>> + /* change the t_hot to t_cold + 5000 millidegrees */
>> + add_hyst(t_cold, HYST_VAL, &hot);
>> + /* 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 |= (hot <<
>> + __ffs(temp_sensor->registers->threshold_thot_mask));
>> + omap_temp_sensor_writel(temp_sensor, reg_val,
>> + temp_sensor->registers->bgap_threshold);
>
> This is a duplicate of earlier code. Please consolidate.
Ok
>
>> + t_hot = hot;
>> + }
>> +
>> + /* 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);
>> + }
>> + /* obtain the T cold value */
>> + cold = omap_temp_sensor_readl(temp_sensor,
>> + temp_sensor->registers->bgap_threshold);
>> + cold = (cold & temp_sensor->registers->threshold_tcold_mask)
>> + >> __ffs(temp_sensor->registers->threshold_tcold_mask);
>> +
>> + /* obtain the T HOT value */
>> + hot = omap_temp_sensor_readl(temp_sensor,
>> + temp_sensor->registers->bgap_threshold);
>> + hot = (hot & temp_sensor->registers->threshold_thot_mask) >>
>> + __ffs(temp_sensor->registers->threshold_thot_mask);
>> +
>> + /* 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 current temperature is in-between the hot and cold thresholds
>> + * Enable both masks or in the init case enable both masks
>> + */
>> + if ((temp > cold && temp < hot) || (set_cold && set_hot))
>> + omap_temp_sensor_unmask_interrupts(temp_sensor, 1, 1);
>> +
>> + /*
>> + * If user sets the HIGH threshold(t_hot) greater than the current
>> + * temperature(temp) unmask the HOT interrupts
>> + */
>> + else if (hot > temp)
>> + omap_temp_sensor_unmask_interrupts(temp_sensor, 1, 0);
>> +
>> + /*
>> + * If user sets the LOW threshold(t_cold) lower than the current
>> + * temperature(temp) unmask the COLD interrupts
>> + */
>> + else
>> + omap_temp_sensor_unmask_interrupts(temp_sensor, 0, 1);
>
> This if statement is surely a violation of the spirit of
> Documentation/CodingStyle, if not the text itself.
>
> If you really need an if statement like this, try something like:
>
> if ((temp > cold && temp < hot) || (set_cold && set_hot)) {
> /*
> * If current temperature is in-between the hot and cold thresholds
> * Enable both masks or in the init case enable both masks
> */
>
> omap_temp_sensor_unmask_interrupts(temp_sensor, 1, 1);
> } else if (hot > temp) {
> /*
> * If user sets the HIGH threshold(t_hot) greater than the current
> * temperature(temp) unmask the HOT interrupts
> */
> omap_temp_sensor_unmask_interrupts(temp_sensor, 1, 0);
> } else {
> /*
> * If user sets the LOW threshold(t_cold) lower than the current
> * temperature(temp) unmask the COLD interrupts
> */
> omap_temp_sensor_unmask_interrupts(temp_sensor, 0, 1);
> }
>
Ok
>
>> +}
>> +
>> +/* Sysfs hook functions */
>
> These should be conditionally compiled out if sysfs isn't compiled in.
>
>> +
>> +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;
>> +
>> + 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);
>> + temp = adc_to_temp_conversion(temp);
>> +
>> + 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 t_hot;
>> +
>> + if (strict_strtol(buf, 10, &val))
>> + return -EINVAL;
>> + if (val < MIN_TEMP - HYST_VAL)
>> + return -EINVAL;
>> +
>> + t_hot = temp_to_adc_conversion(val);
>> + if (t_hot < 0)
>> + return t_hot;
>> +
>> + mutex_lock(&temp_sensor->sensor_mutex);
>> + omap_temp_sensor_configure_thresholds_mask(temp_sensor, 1, 0,
>> + t_hot, 0);
>> + 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;
>> +
>> + 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");
>> + return -EIO;
>> + }
>> +
>> + temp = adc_to_temp_conversion(temp);
>> +
>> + 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 t_cold;
>> + long val;
>> +
>> + if (strict_strtol(buf, 10, &val)) {
>> + count = -EINVAL;
>> + goto out;
>> + }
>> +
>> + if (val > MAX_TEMP - HYST_VAL) {
>> + count = -EINVAL;
>> + goto out;
>> + }
>> +
>> + t_cold = temp_to_adc_conversion(val);
>> + if (t_cold < 0)
>> + return t_cold;
>> +
>> +
>> + mutex_lock(&temp_sensor->sensor_mutex);
>> + omap_temp_sensor_configure_thresholds_mask(temp_sensor, 0, 1, 0,
>> + t_cold);
>> + mutex_unlock(&temp_sensor->sensor_mutex);
>> +
>> +out:
>> + return count;
>> +}
>> +
>> +static ssize_t show_update_interval(struct device *dev,
>> + struct device_attribute *devattr, char *buf)
>> +{
>> + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev);
>> + u32 temp;
>> +
>> + 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;
>> +
>> + return sprintf(buf, "%d\n", temp);
>> +}
>> +
>> +static ssize_t set_update_interval(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;
>> +
>> + if (strict_strtol(buf, 10, &val)) {
>> + count = -EINVAL;
>> + goto out;
>> + }
>> +
>> + if (val < 0)
>> + return -EINVAL;
>> + val *= temp_sensor->clk_rate / 1000;
>> + mutex_lock(&temp_sensor->sensor_mutex);
>> + omap_configure_temp_sensor_counter(temp_sensor, val);
>> + mutex_unlock(&temp_sensor->sensor_mutex);
>> +out:
>> + 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;
>> +
>> + temp = omap_temp_sensor_readl(temp_sensor,
>> + temp_sensor->registers->temp_sensor_ctrl);
>> + temp &= temp_sensor->registers->bgap_dtemp_mask;
>> +
>> + /* look up for temperature in the table and return the temperature */
>> + if (temp < OMAP_ADC_START_VALUE || temp > OMAP_ADC_END_VALUE)
>> + return -EIO;
>> +
>> + temp = adc_to_temp[temp - OMAP_ADC_START_VALUE];
>> +
>> + return sprintf(buf, "%d\n", temp);
>> +}
>> +
>> +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_interval, S_IWUSR | S_IRUGO,
>> + show_update_interval, set_update_interval, 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_interval.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->pdev_dev, "clock already on\n");
>> + goto out;
>> + }
>> +
>> + ret = pm_runtime_get_sync(temp_sensor->pdev_dev);
>> + if (ret < 0) {
>> + dev_err(temp_sensor->pdev_dev, "get sync failed\n");
>> + goto out;
>> + }
>> +
>> + temp_sensor->clk_on = 1;
>> +
>> +out:
>> + return ret;
>> +}
>> +
>> +static void omap_temp_sensor_clk_disable(struct omap_temp_sensor *temp_sensor)
>> +{
>> + /* Gate the clock */
>> + pm_runtime_put_sync(temp_sensor->hwmon_dev);
>> + temp_sensor->clk_on = 0;
>> +}
>> +
>> +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);
>> +
>> + if (temp_sensor->hwmon_dev)
>> + /* kobject_uvent to user space telling 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 clk_rate;
>> + u32 max_freq, min_freq;
>> +
>> + if (!pdata) {
>> + dev_err(&pdev->dev, "platform data missing\n");
>> + return -EINVAL;
>> + }
>> +
>> + temp_sensor = kzalloc(sizeof(*temp_sensor), GFP_KERNEL);
>> + if (!temp_sensor) {
>> + dev_err(&pdev->dev, "Memory allocation failed\n");
>> + 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));
>> + if (!temp_sensor->phy_base) {
>> + dev_err(&pdev->dev, "ioremap failed\n");
>> + ret = -ENOMEM;
>> + goto plat_res_err;
>> + }
>> +
>> + temp_sensor->clock = NULL;
>> + temp_sensor->registers = pdata->registers;
>> + temp_sensor->pdev_dev = &pdev->dev;
>> +
>> + if (pdata->max_freq && pdata->min_freq) {
>> + max_freq = pdata->max_freq;
>> + min_freq = pdata->min_freq;
>> + } else {
>> + max_freq = MAX_FREQ;
>> + min_freq = MIN_FREQ;
>> + }
>> +
>> + 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))
>> + dev_info(&pdev->dev,
>> + "Invalid EFUSE, Non-trimmed BGAP, Temp not accurate\n");
>> +
>> + dev_set_drvdata(&pdev->dev, temp_sensor);
>> + temp_sensor->clock = clk_get(&pdev->dev, "fck");
>> + if (IS_ERR(temp_sensor->clock)) {
>> + ret = PTR_ERR(temp_sensor->clock);
>> + dev_err(&pdev->dev,
>> + "unable to get fclk: %d\n", ret);
>> + goto plat_res_err;
>> + }
>> +
>> + ret = omap_temp_sensor_clk_enable(temp_sensor);
>> + if (ret)
>> + goto clken_err;
>> +
>> + clk_rate = clk_round_rate(temp_sensor->clock, max_freq);
>> + if (clk_rate < min_freq || clk_rate == 0xffffffff) {
>> + ret = -ENODEV;
>> + 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 clk cycle */
>> + 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);
>> +
>> + 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;
>> + }
>> +
>> + 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;
>> + }
>> +
>> + 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;
>> + }
>> +
>> + mutex_lock(&temp_sensor->sensor_mutex);
>> + omap_temp_sensor_configure_thresholds_mask(temp_sensor, 1, 1,
>> + T_HOT, T_COLD);
>> + mutex_unlock(&temp_sensor->sensor_mutex);
>> +
>> + return 0;
>> +
>> +hwmon_reg_err:
>> + sysfs_remove_group(&temp_sensor->hwmon_dev->kobj,
>> + &omap_temp_sensor_group);
>> +sysfs_create_err:
>> + free_irq(temp_sensor->irq, temp_sensor);
>> +req_irq_err:
>> + omap_temp_sensor_clk_disable(temp_sensor);
>> +clken_err:
>> + clk_put(temp_sensor->clock);
>> + iounmap(temp_sensor->phy_base);
>> +plat_res_err:
>> + dev_set_drvdata(&pdev->dev, NULL);
>> + 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);
>> + sysfs_remove_group(&temp_sensor->hwmon_dev->kobj,
>> + &omap_temp_sensor_group);
>> + free_irq(temp_sensor->irq, temp_sensor);
>> + omap_temp_sensor_clk_disable(temp_sensor);
>> + clk_put(temp_sensor->clock);
>> + iounmap(temp_sensor->phy_base);
>> + dev_set_drvdata(&pdev->dev, NULL);
>> + 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 int omap_temp_sensor_idle(struct device *dev)
>> +{
>> + return 0;
>> +}
>> +
>> +static const struct dev_pm_ops omap_temp_sensor_dev_pm_ops = {
>> + SET_SYSTEM_SLEEP_PM_OPS(omap_temp_sensor_suspend,
>> + omap_temp_sensor_resume)
>> + SET_RUNTIME_PM_OPS(omap_temp_sensor_runtime_suspend,
>> + omap_temp_sensor_runtime_resume, omap_temp_sensor_idle)
>> +};
>> +
>> +#define DEV_PM_OPS (&omap_temp_sensor_dev_pm_ops)
>> +#else
>> +#define DEV_PM_OPS NULL
>> +#endif
>> +
>> +static struct platform_driver omap_temp_sensor_driver = {
>> + .probe = omap_temp_sensor_probe,
>> + .remove = omap_temp_sensor_remove,
>> + .driver = {
>> + .name = "omap_temp_sensor",
>> + .pm = DEV_PM_OPS,
>> + },
>> +};
>> +
>> +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
>>
>> --
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>> the body of a message to majordomo@xxxxxxxxxxxxxxx
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
>
> - Paul
>
--
Regards and Thanks,
Keerthy
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