linux-kernel - [ 22/82] hwmon: (pmbus/ltc2978) Fix peak attribute handling

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Message-Id: <20130318042146.472232541@decadent.org.uk>
Date:	Mon, 18 Mar 2013 04:22:06 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Guenter Roeck <linux@...ck-us.net>,
	Jean Delvare <khali@...ux-fr.org>
Subject: [ 22/82] hwmon: (pmbus/ltc2978) Fix peak attribute handling

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@...ck-us.net>

commit dbd712c2272764a536e29ad6841dba74989a39d9 upstream.

Peak attributes were not initialized and cleared correctly.
Also, temp2_max is only supported on page 0 and thus does not need to be
an array.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: Jean Delvare <khali@...ux-fr.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hwmon/pmbus/ltc2978.c |   28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -62,7 +62,7 @@ struct ltc2978_data {
 	int temp_min, temp_max;
 	int vout_min[8], vout_max[8];
 	int iout_max[2];
-	int temp2_max[2];
+	int temp2_max;
 	struct pmbus_driver_info info;
 };
 
@@ -204,10 +204,9 @@ static int ltc3880_read_word_data(struct
 		ret = pmbus_read_word_data(client, page,
 					   LTC3880_MFR_TEMPERATURE2_PEAK);
 		if (ret >= 0) {
-			if (lin11_to_val(ret)
-			    > lin11_to_val(data->temp2_max[page]))
-				data->temp2_max[page] = ret;
-			ret = data->temp2_max[page];
+			if (lin11_to_val(ret) > lin11_to_val(data->temp2_max))
+				data->temp2_max = ret;
+			ret = data->temp2_max;
 		}
 		break;
 	case PMBUS_VIRT_READ_VIN_MIN:
@@ -248,11 +247,11 @@ static int ltc2978_write_word_data(struc
 
 	switch (reg) {
 	case PMBUS_VIRT_RESET_IOUT_HISTORY:
-		data->iout_max[page] = 0x7fff;
+		data->iout_max[page] = 0x7c00;
 		ret = ltc2978_clear_peaks(client, page, data->id);
 		break;
 	case PMBUS_VIRT_RESET_TEMP2_HISTORY:
-		data->temp2_max[page] = 0x7fff;
+		data->temp2_max = 0x7c00;
 		ret = ltc2978_clear_peaks(client, page, data->id);
 		break;
 	case PMBUS_VIRT_RESET_VOUT_HISTORY:
@@ -262,12 +261,12 @@ static int ltc2978_write_word_data(struc
 		break;
 	case PMBUS_VIRT_RESET_VIN_HISTORY:
 		data->vin_min = 0x7bff;
-		data->vin_max = 0;
+		data->vin_max = 0x7c00;
 		ret = ltc2978_clear_peaks(client, page, data->id);
 		break;
 	case PMBUS_VIRT_RESET_TEMP_HISTORY:
 		data->temp_min = 0x7bff;
-		data->temp_max = 0x7fff;
+		data->temp_max = 0x7c00;
 		ret = ltc2978_clear_peaks(client, page, data->id);
 		break;
 	default:
@@ -323,10 +322,11 @@ static int ltc2978_probe(struct i2c_clie
 	info = &data->info;
 	info->write_word_data = ltc2978_write_word_data;
 
-	data->vout_min[0] = 0xffff;
 	data->vin_min = 0x7bff;
+	data->vin_max = 0x7c00;
 	data->temp_min = 0x7bff;
-	data->temp_max = 0x7fff;
+	data->temp_max = 0x7c00;
+	data->temp2_max = 0x7c00;
 
 	switch (id->driver_data) {
 	case ltc2978:
@@ -338,7 +338,6 @@ static int ltc2978_probe(struct i2c_clie
 		for (i = 1; i < 8; i++) {
 			info->func[i] = PMBUS_HAVE_VOUT
 			  | PMBUS_HAVE_STATUS_VOUT;
-			data->vout_min[i] = 0xffff;
 		}
 		break;
 	case ltc3880:
@@ -354,12 +353,15 @@ static int ltc2978_probe(struct i2c_clie
 		  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
 		  | PMBUS_HAVE_POUT
 		  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
-		data->vout_min[1] = 0xffff;
+		data->iout_max[0] = 0x7c00;
+		data->iout_max[1] = 0x7c00;
 		break;
 	default:
 		ret = -ENODEV;
 		goto err_mem;
 	}
+	for (i = 0; i < info->pages; i++)
+		data->vout_min[i] = 0xffff;
 
 	ret = pmbus_do_probe(client, id, info);
 	if (ret)


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