/*
- * drivers/hwmon/tsc210x_sensors.c
- *
- * hwmon interface for TSC210X sensors
+ * tsc210x_sensors.c - hwmon interface to TI TSC210x sensors
*
* Copyright (c) 2005-2007 Andrzej Zaborowski <balrog@zabor.org>
*
#include <linux/spi/tsc210x.h>
+
+/*
+ * TI TSC210x chips include an ADC that's shared between various
+ * sensors (temperature, battery, vAUX, etc) and the touchscreen.
+ * This driver packages access to the non-touchscreen sensors
+ * available on a given board.
+ */
+
struct tsc210x_hwmon {
int bat[2], aux[2], temp[2];
struct class_device *dev;
struct tsc210x_config *pdata;
#ifdef CONFIG_APM
+ /* prevent APM from colliding with normal hwmon accessors */
spinlock_t apm_lock;
#endif
};
#ifdef CONFIG_APM
-# define apm_lock() spin_lock(&hwmon->apm_lock)
-# define apm_unlock() spin_unlock(&hwmon->apm_lock)
+# define apm_lock(h) spin_lock(&(h)->apm_lock)
+# define apm_unlock(h) spin_unlock(&(h)->apm_lock)
#else
-# define apm_lock()
-# define apm_unlock()
+# define apm_lock(h) do { } while (0)
+# define apm_unlock(h) do { } while (0)
#endif
-static void tsc210x_ports(struct tsc210x_hwmon *hwmon, int bat[], int aux[])
+static void tsc210x_ports(void *context, int bat[], int aux[])
{
- apm_lock();
+ struct tsc210x_hwmon *hwmon = context;
+
+ apm_lock(hwmon);
+
+ /* FIXME for tsc2101 and tsc2111, battery voltage is:
+ * VBAT = (5 * VREF * (bat[x])) / (2 ^ bits)
+ * For tsc2100 and tsc2102, use "6" not "5"; that formula ignores
+ * an external 100-300 Ohm resistor making the right value be just
+ * a bit over 5 (or 6).
+ *
+ * FIXME the vAUX measurements need scaling too, but in that case
+ * there's no *internal* voltage divider so just scale to VREF.
+ *
+ * --> This code needs to know VREF, the VBAT multiplier, and
+ * the precision. For now, assume VREF 1.25V and 12 bits.
+ * When an external reference is used, it normally won't
+ * match the 1.25V (or 2.5V) values supported internally...
+ *
+ * --> Output units should become milliVolts; currently they are
+ * dimensionless...
+ */
hwmon->bat[0] = bat[0];
hwmon->bat[1] = bat[1];
+
hwmon->aux[0] = aux[0];
hwmon->aux[1] = aux[1];
- apm_unlock();
+
+ apm_unlock(hwmon);
}
-static void tsc210x_temp1(struct tsc210x_hwmon *hwmon, int temp)
+/* FIXME temp sensors also need scaling so values are milliVolts...
+ * temperature (given calibration data) should be millidegrees C.
+ */
+
+static void tsc210x_temp1(void *context, int temp)
{
- apm_lock();
+ struct tsc210x_hwmon *hwmon = context;
+
+ apm_lock(hwmon);
hwmon->temp[0] = temp;
- apm_unlock();
+ apm_unlock(hwmon);
}
-static void tsc210x_temp2(struct tsc210x_hwmon *hwmon, int temp)
+static void tsc210x_temp2(void *context, int temp)
{
- apm_lock();
+ struct tsc210x_hwmon *hwmon = context;
+
+ apm_lock(hwmon);
hwmon->temp[1] = temp;
- apm_unlock();
+ apm_unlock(hwmon);
}
#define TSC210X_INPUT(devname, field) \
static ssize_t tsc_show_ ## devname(struct device *dev, \
struct device_attribute *devattr, char *buf) \
{ \
- struct tsc210x_hwmon *hwmon = (struct tsc210x_hwmon *) \
- platform_get_drvdata(to_platform_device(dev)); \
+ struct tsc210x_hwmon *hwmon = dev_get_drvdata(dev); \
return sprintf(buf, "%i\n", hwmon->field); \
} \
static DEVICE_ATTR(devname ## _input, S_IRUGO, tsc_show_ ## devname, NULL);
static ssize_t tsc_show_temp1(struct device *dev,
struct device_attribute *devattr, char *buf)
{
- struct tsc210x_hwmon *hwmon = (struct tsc210x_hwmon *)
- platform_get_drvdata(to_platform_device(dev));
- int t1, t2;
- int diff, value;
-
- t1 = hwmon->temp[0];
- t2 = hwmon->temp[1];
+ struct tsc210x_hwmon *hwmon = dev_get_drvdata(dev);
+ int t1 = hwmon->temp[0];
+ int t2 = hwmon->temp[1];
+ int diff;
+ int value;
/*
* Use method #2 (differential) to calculate current temperature.
* 273150 is zero degrees Celcius.
*/
diff = hwmon->pdata->temp_at25c[1] - hwmon->pdata->temp_at25c[0];
- BUG_ON(diff == 0);
value = (t2 - t1) * 298150 / diff; /* This is in Kelvins now */
value -= 273150; /* Celcius millidegree */
static void tsc210x_get_power_status(struct apm_power_info *info)
{
struct tsc210x_hwmon *hwmon = apm_hwmon;
- apm_lock();
+
+ apm_lock(hwmon);
hwmon->pdata->apm_report(info, hwmon->bat);
- apm_unlock();
+ apm_unlock(hwmon);
}
#endif
hwmon = (struct tsc210x_hwmon *)
kzalloc(sizeof(struct tsc210x_hwmon), GFP_KERNEL);
if (!hwmon) {
- printk(KERN_ERR "%s: allocation failed\n", __FUNCTION__);
+ dev_dbg(&pdev->dev, "allocation failed\n");
return -ENOMEM;
}
hwmon->dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(hwmon->dev)) {
kfree(hwmon);
- printk(KERN_ERR "%s: Class registration failed\n",
- __FUNCTION__);
+ dev_dbg(&pdev->dev, "registration failed\n");
return PTR_ERR(hwmon->dev);
}
if (pdata->monitor & (TSC_BAT1 | TSC_BAT2 | TSC_AUX1 | TSC_AUX2))
status |= tsc210x_ports_cb(pdev->dev.parent,
- (tsc210x_ports_t) tsc210x_ports, hwmon);
+ tsc210x_ports, hwmon);
if (pdata->monitor & TSC_TEMP) {
status |= tsc210x_temp1_cb(pdev->dev.parent,
- (tsc210x_temp_t) tsc210x_temp1, hwmon);
+ tsc210x_temp1, hwmon);
status |= tsc210x_temp2_cb(pdev->dev.parent,
- (tsc210x_temp_t) tsc210x_temp2, hwmon);
+ tsc210x_temp2, hwmon);
}
if (status) {
- tsc210x_ports_cb(pdev->dev.parent, 0, 0);
- tsc210x_temp1_cb(pdev->dev.parent, 0, 0);
- tsc210x_temp2_cb(pdev->dev.parent, 0, 0);
- platform_set_drvdata(pdev, 0);
+ tsc210x_ports_cb(pdev->dev.parent, NULL, NULL);
+ tsc210x_temp1_cb(pdev->dev.parent, NULL, NULL);
+ tsc210x_temp2_cb(pdev->dev.parent, NULL, NULL);
+ platform_set_drvdata(pdev, NULL);
#ifdef CONFIG_APM
if (pdata->apm_report)
apm_get_power_status = 0;
if (pdata->monitor & TSC_TEMP) {
status |= device_create_file(&pdev->dev, &dev_attr_in4_input);
status |= device_create_file(&pdev->dev, &dev_attr_in5_input);
- status |= device_create_file(&pdev->dev, &dev_attr_temp1_input);
+
+ if ((pdata->temp_at25c[1] - pdata->temp_at25c[0]) == 0)
+ dev_warn(&pdev->dev, "No temp calibration data.\n");
+ else
+ status |= device_create_file(&pdev->dev,
+ &dev_attr_temp1_input);
}
if (status) /* Not fatal */
- printk(KERN_ERR "%s: Creating one or more "
- "attribute files failed\n", __FUNCTION__);
+ dev_dbg(&pdev->dev, "Creating one or more "
+ "attribute files failed\n");
return 0;
}
-static int tsc210x_hwmon_remove(struct platform_device *pdev)
+static int __exit tsc210x_hwmon_remove(struct platform_device *pdev)
{
struct tsc210x_hwmon *dev = platform_get_drvdata(pdev);
- tsc210x_ports_cb(pdev->dev.parent, 0, 0);
- tsc210x_temp1_cb(pdev->dev.parent, 0, 0);
- tsc210x_temp2_cb(pdev->dev.parent, 0, 0);
- platform_set_drvdata(pdev, 0);
+ tsc210x_ports_cb(pdev->dev.parent, NULL, NULL);
+ tsc210x_temp1_cb(pdev->dev.parent, NULL, NULL);
+ tsc210x_temp2_cb(pdev->dev.parent, NULL, NULL);
+ platform_set_drvdata(pdev, NULL);
#ifdef CONFIG_APM
if (dev->pdata->apm_report)
apm_get_power_status = 0;
}
static struct platform_driver tsc210x_hwmon_driver = {
- .probe = tsc210x_hwmon_probe,
- .remove = tsc210x_hwmon_remove,
+ .probe = tsc210x_hwmon_probe,
+ .remove = __exit_p(tsc210x_hwmon_remove),
/* Nothing to do on suspend/resume */
.driver = {
.name = "tsc210x-hwmon",
static int __init tsc210x_hwmon_init(void)
{
+ /* can't use driver_probe() here since the parent device
+ * gets registered "late"
+ */
return platform_driver_register(&tsc210x_hwmon_driver);
}
+module_init(tsc210x_hwmon_init);
static void __exit tsc210x_hwmon_exit(void)
{
platform_driver_unregister(&tsc210x_hwmon_driver);
}
-
-module_init(tsc210x_hwmon_init);
module_exit(tsc210x_hwmon_exit);
MODULE_AUTHOR("Andrzej Zaborowski");
projects / linux-2.6-omap-h63xx.git / blobdiff