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Date: Wed, 10 Jul 2013 19:25:38 +0800
From: Wei Ni <wni@...dia.com>
To: <khali@...ux-fr.org>, <swarren@...dotorg.org>,
<linux@...ck-us.net>, <thierry.reding@...il.com>
CC: <lm-sensors@...sensors.org>, <linux-kernel@...r.kernel.org>,
<linux-tegra@...r.kernel.org>, Wei Ni <wni@...dia.com>
Subject: [PATCH v2 2/3] hwmon: (lm90) add support to handle IRQ.
When the temperature exceed the limit range value,
the driver can handle the interrupt.
Signed-off-by: Wei Ni <wni@...dia.com>
---
drivers/hwmon/lm90.c | 77 +++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 64 insertions(+), 13 deletions(-)
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 2cb7f8e..88ff362 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -89,6 +89,7 @@
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
+#include <linux/interrupt.h>
/*
* Addresses to scan
@@ -179,6 +180,19 @@ enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
#define LM90_HAVE_TEMP3 (1 << 6) /* 3rd temperature sensor */
#define LM90_HAVE_BROKEN_ALERT (1 << 7) /* Broken alert */
+/* LM90 status */
+#define LM90_LTHRM (1 << 0) /* local THERM limit tripped */
+#define LM90_RTHRM (1 << 1) /* remote THERM limit tripped */
+#define LM90_OPEN (1 << 2) /* remote is an open circuit */
+#define LM90_RLOW (1 << 3) /* remote low temp limit tripped */
+#define LM90_RHIGH (1 << 4) /* remote high temp limit tripped */
+#define LM90_LLOW (1 << 5) /* local low temp limit tripped */
+#define LM90_LHIGH (1 << 6) /* local high temp limit tripped */
+#define LM90_BUSY (1 << 7) /* ADC is converting */
+
+#define MAX6696_RLOW (1 << 3) /* remote2 low temp limit tripped */
+#define MAX6696_RHIGH (1 << 4) /* remote2 high temp limit tripped */
+
/*
* Driver data (common to all clients)
*/
@@ -1423,6 +1437,43 @@ static void lm90_init_client(struct i2c_client *client)
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
+static void lm90_alarm_status(struct i2c_client *client,
+ u8 alarms, u8 alarms_max6696)
+{
+ if (alarms & (LM90_LLOW | LM90_LHIGH | LM90_LTHRM))
+ dev_warn(&client->dev,
+ "temp%d out of range, please check!\n", 1);
+ if (alarms & (LM90_RLOW | LM90_RHIGH | LM90_RTHRM))
+ dev_warn(&client->dev,
+ "temp%d out of range, please check!\n", 2);
+ if (alarms & LM90_OPEN)
+ dev_warn(&client->dev,
+ "temp%d diode open, please check!\n", 2);
+
+ if (alarms_max6696 & (MAX6696_RLOW | MAX6696_RHIGH))
+ dev_warn(&client->dev,
+ "temp%d out of range, please check!\n", 3);
+}
+
+static irqreturn_t lm90_irq_thread(int irq, void *dev_id)
+{
+ struct lm90_data *data = dev_id;
+ struct i2c_client *client = to_i2c_client(data->hwmon_dev->parent);
+ u8 alarms, alarms_max6696 = 0;
+
+ lm90_read_reg(client, LM90_REG_R_STATUS, &alarms);
+
+ if (data->kind == max6696)
+ lm90_read_reg(client, MAX6696_REG_R_STATUS2, &alarms_max6696);
+
+ if ((alarms & 0x7f) == 0 && (alarms_max6696 & 0xfe) == 0) {
+ return IRQ_NONE;
+ } else {
+ lm90_alarm_status(client, alarms, alarms_max6696);
+ return IRQ_HANDLED;
+ }
+}
+
static int lm90_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1499,6 +1550,18 @@ static int lm90_probe(struct i2c_client *client,
goto exit_remove_files;
}
+ if (client->irq >= 0) {
+ dev_dbg(dev, "lm90 IRQ: %d\n", client->irq);
+ err = devm_request_threaded_irq(dev, client->irq,
+ NULL, lm90_irq_thread,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "lm90", data);
+ if (err < 0) {
+ dev_err(dev, "cannot request interrupt\n");
+ goto exit_remove_files;
+ }
+ }
+
return 0;
exit_remove_files:
@@ -1532,19 +1595,7 @@ static void lm90_alert(struct i2c_client *client, unsigned int flag)
if ((alarms & 0x7f) == 0 && (alarms2 & 0xfe) == 0) {
dev_info(&client->dev, "Everything OK\n");
} else {
- if (alarms & 0x61)
- dev_warn(&client->dev,
- "temp%d out of range, please check!\n", 1);
- if (alarms & 0x1a)
- dev_warn(&client->dev,
- "temp%d out of range, please check!\n", 2);
- if (alarms & 0x04)
- dev_warn(&client->dev,
- "temp%d diode open, please check!\n", 2);
-
- if (alarms2 & 0x18)
- dev_warn(&client->dev,
- "temp%d out of range, please check!\n", 3);
+ lm90_alarm_status(client, alarms, alarms2);
/*
* Disable ALERT# output, because these chips don't implement
--
1.7.9.5
--
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