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Date: Mon, 20 Jun 2011 19:06:37 +0530
From: ashishj3 <ashish.jangam@...tcummins.com>
To: <guenter.roeck@...csson.com>
CC: <randy.dunlap@...cle.com>, <linux-kernel@...r.kernel.org>,
<lm-sensors@...sensors.org>, <dchen@...semi.com>
Subject: [PATCHv5 6/11] HWMON: moved DA9052 battery temperature lookup
table to a common place
Signed-off-by: David Dajun Chen <dchen@...semi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@...tcummins.com>
---
Changes since v4:
- DA9052 battery temperature lookup table tbat_lookup[] is moved to a
common MFD header file were both Battery and Hwmon module can access
it.
- tbat_lookup[] table is now in mill degree celsius.
- removed couple of intermidate temporary variables.
- removed extra blank lines.
- used common path error handling.
- couple of code formatting errors.
diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c
index 0e54508..f7797dc 100755
--- a/drivers/hwmon/da9052-hwmon.c
+++ b/drivers/hwmon/da9052-hwmon.c
@@ -29,6 +29,7 @@ struct da9052_hwmon {
struct device *class_device;
struct mutex hwmon_lock;
};
+
static const char * const input_names[] = {
[DA9052_ADC_VDDOUT] = "VDDOUT",
[DA9052_ADC_ICH] = "CHARGING CURRENT",
@@ -41,40 +42,6 @@ static const char * const input_names[] = {
[DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE",
};
-/*
- * TBAT look-up table is computed from the R90 reg (8 bit register)
- * reading as below.
- * TBAT = 1/(t1+1/298) - 273
- * where t1 = (1/B)* ln(( ADCval * 2.5)/(R25*ITBAT*255))
- * Default values are R25 = 10e3, B = 3380, ITBAT = 50e-6
- * Example:
- * R25=10E3, B=3380, ITBAT=50e-6, ADCVAL=62d calculates
- * TBAT = 20 degrees Centrigrade
- * For R90 reading of 0, a value of -1 is returned, as log of 0
- * is undefined.
-*/
-static const int8_t tbat_lookup[] = {
- -1, 183, 144, 124, 111, 102, 94, 88, 83, 79, 75, 72, 69, 66, 63,
- 61, 59, 57, 55, 53, 52, 50, 49, 48, 46, 45, 44, 43, 42,
- 41, 40, 39, 38, 37, 36, 35, 35, 34, 33, 32, 32, 31, 30,
- 30, 29, 28, 28, 27, 27, 26, 26, 25, 25, 24, 24, 23, 23,
- 22, 22, 21, 21, 20, 20, 20, 19, 19, 18, 18, 18, 17, 17,
- 17, 16, 16, 16, 15, 15, 15, 14, 14, 14, 13, 13, 13, 12,
- 12, 12, 12, 11, 11, 11, 11, 10, 10, 10, 10, 9, 9, 9,
- 9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 6, 6, 6, 6,
- 6, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 3, 3,
- 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1,
- 1, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -1, -1,
- -2, -2, -2, -2, -2, -2, -2, -3, -3, -3, -3, -3, -3, -3,
- -3, -4, -4, -4, -4, -4, -4, -4, -4, -5, -5, -5, -5, -5,
- -5, -5, -5, -5, -6, -6, -6, -6, -6, -6, -6, -6, -6, -7,
- -7, -7, -7, -7, -7, -7, -7, -7, -8, -8, -8, -8, -8, -8,
- -8, -8, -8, -8, -8, -9, -9, -9, -9, -9, -9, -9, -9, -9,
- -9, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, -11,
- -11, -11, -11, -11, -11, -11, -11, -11, -11, -11, -12, -12, -12, -12,
- -12, -12, -12
-};
-
static int da9052_enable_vddout_channel(struct da9052 *da9052)
{
int ret;
@@ -84,6 +51,7 @@ static int da9052_enable_vddout_channel(struct da9052 *da9052)
return ret;
ret |= DA9052_ADCCONT_AUTOVDDEN;
+
return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
}
@@ -96,12 +64,12 @@ static int da9052_disable_vddout_channel(struct da9052 *da9052)
return ret;
ret &= ~DA9052_ADCCONT_AUTOVDDEN;
- return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
+ return da9052_reg_write(da9052, DA9052_ADC_CONT_REG, ret);
}
static ssize_t da9052_read_vddout(struct device *dev,
- struct device_attribute *devattr, char *buf)
+ struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int ret, vdd = -1;
@@ -126,13 +94,14 @@ static ssize_t da9052_read_vddout(struct device *dev,
mutex_unlock(&hwmon->hwmon_lock);
return sprintf(buf, "%d\n", vdd);
}
+
hwmon_err:
mutex_unlock(&hwmon->hwmon_lock);
return ret;
}
static ssize_t da9052_read_ich(struct device *dev,
- struct device_attribute *devattr, char *buf)
+ struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int ret;
@@ -142,21 +111,15 @@ static ssize_t da9052_read_ich(struct device *dev,
return ret;
/* Equivalent to 3.9mA/bit in register ICHG_AV */
- ret = DIV_ROUND_CLOSEST(ret * 39, 10);
- return sprintf(buf, "%d\n", ret);
+ return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(ret * 39, 10));
}
static ssize_t da9052_read_tbat(struct device *dev,
- struct device_attribute *devattr, char *buf)
+ struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
- int ret, tbat;
- ret = da9052_reg_read(hwmon->da9052, DA9052_TBAT_RES_REG);
- if (ret < 0)
- return ret;
- tbat = tbat_lookup[ret];
- return sprintf(buf, "%d\n", (tbat*1000));
+ return sprintf(buf, "%d\n", da9052_adc_temperature_read(hwmon->da9052));
}
static ssize_t da9052_read_vbat(struct device *dev,
@@ -173,7 +136,8 @@ static ssize_t da9052_read_vbat(struct device *dev,
}
static ssize_t da9052_read_misc_channel(struct device *dev,
- struct device_attribute *devattr, char *buf)
+ struct device_attribute *devattr,
+ char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int channel = to_sensor_dev_attr(devattr)->index;
@@ -187,29 +151,25 @@ static ssize_t da9052_read_misc_channel(struct device *dev,
}
static ssize_t da9052_read_tjunc(struct device *dev,
- struct device_attribute *devattr, char *buf)
+ struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
- int temp;
- int ret;
+ int tjunc, toffset;
- ret = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
- if (ret < 0)
- return ret;
+ tjunc = da9052_reg_read(hwmon->da9052, DA9052_TJUNC_RES_REG);
+ if (tjunc < 0)
+ return tjunc;
- temp = ret;
-
- ret = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
- if (ret < 0)
- return ret;
+ toffset = da9052_reg_read(hwmon->da9052, DA9052_T_OFFSET_REG);
+ if (toffset < 0)
+ return toffset;
/* Degrees celsius = 1.708 * (TJUNC_RES - T_OFFSET) - 108.8 */
- ret = 1708 * (temp - ret) - 108800;
- return sprintf(buf, "%d\n", ret);
+ return sprintf(buf, "%d\n", 1708 * (tjunc - toffset) - 108800);
}
static ssize_t da9052_read_vbbat(struct device *dev,
- struct device_attribute *devattr, char *buf)
+ struct device_attribute *devattr, char *buf)
{
struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
int ret;
@@ -223,7 +183,8 @@ static ssize_t da9052_read_vbbat(struct device *dev,
}
static ssize_t da9052_hwmon_show_name(struct device *dev,
- struct device_attribute *devattr, char *buf)
+ struct device_attribute *devattr,
+ char *buf)
{
return sprintf(buf, "da9052-hwmon\n");
}
@@ -232,47 +193,47 @@ static ssize_t show_label(struct device *dev,
struct device_attribute *devattr, char *buf)
{
return sprintf(buf, "%s\n",
- input_names[to_sensor_dev_attr(devattr)->index]);
+ input_names[to_sensor_dev_attr(devattr)->index]);
}
static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL,
- DA9052_ADC_ICH);
+ DA9052_ADC_ICH);
static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_ICH);
+ DA9052_ADC_ICH);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL,
- DA9052_ADC_VBAT);
+ DA9052_ADC_VBAT);
static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_VBAT);
+ DA9052_ADC_VBAT);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL,
- DA9052_ADC_IN4);
+ DA9052_ADC_IN4);
static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_IN4);
+ DA9052_ADC_IN4);
static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL,
- DA9052_ADC_IN5);
+ DA9052_ADC_IN5);
static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_IN5);
+ DA9052_ADC_IN5);
static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL,
- DA9052_ADC_IN6);
+ DA9052_ADC_IN6);
static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_IN6);
+ DA9052_ADC_IN6);
static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL,
- DA9052_ADC_VBBAT);
+ DA9052_ADC_VBBAT);
static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_VBBAT);
+ DA9052_ADC_VBBAT);
+
static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL,
- DA9052_ADC_ICH);
+ DA9052_ADC_ICH);
static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_ICH);
+ DA9052_ADC_ICH);
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, da9052_read_tbat, NULL,
- DA9052_ADC_TBAT);
+ DA9052_ADC_TBAT);
static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_TBAT);
-
+ DA9052_ADC_TBAT);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tjunc, NULL,
- DA9052_ADC_TJUNC);
+ DA9052_ADC_TJUNC);
static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL,
- DA9052_ADC_TJUNC);
+ DA9052_ADC_TJUNC);
static DEVICE_ATTR(name, S_IRUGO, da9052_hwmon_show_name, NULL);
@@ -323,12 +284,13 @@ static int __init da9052_hwmon_probe(struct platform_device *pdev)
hwmon->class_device = hwmon_device_register(&pdev->dev);
if (IS_ERR(hwmon->class_device)) {
ret = PTR_ERR(hwmon->class_device);
- sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
- goto err_mem;
+ goto err_sysfs;
}
return 0;
+err_sysfs:
+ sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
err_mem:
kfree(hwmon);
return ret;
@@ -340,24 +302,22 @@ static int __devexit da9052_hwmon_remove(struct platform_device *pdev)
hwmon_device_unregister(hwmon->class_device);
sysfs_remove_group(&pdev->dev.kobj, &da9052_attr_group);
- mutex_destroy(&hwmon->hwmon_lock);
kfree(hwmon);
+
return 0;
}
static struct platform_driver da9052_hwmon_driver = {
+ .probe = da9052_hwmon_probe,
+ .remove = __devexit_p(da9052_hwmon_remove),
.driver = {
- .name = "da9052-hwmon",
- .owner = THIS_MODULE,
+ .name = "da9052-hwmon",
+ .owner = THIS_MODULE,
},
- .probe = da9052_hwmon_probe,
- .remove = __devexit_p(da9052_hwmon_remove),
-
};
static int __init da9052_hwmon_init(void)
{
-
return platform_driver_register(&da9052_hwmon_driver);
}
module_init(da9052_hwmon_init);
@@ -370,7 +330,5 @@ module_exit(da9052_hwmon_exit);
MODULE_AUTHOR("David Dajun Chen <dchen@...semi.com>");
MODULE_DESCRIPTION("DA9052 HWMON driver");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:da9052-hwmon");
-
-
--
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