linux-kernel - [PATCH v2 2/2] pmbus: ltc2978: add regulator gating

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1408741894-24879-3-git-send-email-atull@opensource.altera.com>
Date:	Fri, 22 Aug 2014 16:11:34 -0500
From:	<atull@...nsource.altera.com>
To:	<linux@...ck-us.net>, <jdelvare@...e.de>
CC:	<lm-sensors@...sensors.org>, <lgirdwood@...il.com>,
	<broonie@...nel.org>, <linux-kernel@...r.kernel.org>,
	<delicious.quinoa@...il.com>, <dinguyen@...nsource.altera.com>,
	<yvanderv@...nsource.altera.com>,
	Alan Tull <atull@...nsource.altera.com>
Subject: [PATCH v2 2/2] pmbus: ltc2978: add regulator gating

From: Alan Tull <atull@...nsource.altera.com>

Add regulator with support for enabling or disabling all
supplies.

Signed-off-by: Alan Tull <atull@...nsource.altera.com>

v2:  Remove '#include <linux/regulator/machine.h>'
     Kconfig fixes
     Remove hardwired regulator_init_data
---
 drivers/hwmon/pmbus/Kconfig   |    7 +++++
 drivers/hwmon/pmbus/ltc2978.c |   60 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 6e1e493..79117b7 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -56,6 +56,13 @@ config SENSORS_LTC2978
 	  This driver can also be built as a module. If so, the module will
 	  be called ltc2978.
 
+config SENSORS_LTC2978_REGULATOR
+	boolean "Regulator support for LTC2974, LTC2978, LTC3880, and LTC3883"
+	depends on SENSORS_LTC2978 && REGULATOR
+	help
+	  If you say yes here you get regulator support for Linear
+	  Technology LTC2974, LTC2978, LTC3880, and LTC3883.
+
 config SENSORS_MAX16064
 	tristate "Maxim MAX16064"
 	default n
diff --git a/drivers/hwmon/pmbus/ltc2978.c b/drivers/hwmon/pmbus/ltc2978.c
index e24ed52..2bdcfe2 100644
--- a/drivers/hwmon/pmbus/ltc2978.c
+++ b/drivers/hwmon/pmbus/ltc2978.c
@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
+#include <linux/regulator/driver.h>
 #include <linux/slab.h>
 #include <linux/i2c.h>
 #include "pmbus.h"
@@ -151,6 +152,60 @@ static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
 	return ret;
 }
 
+#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
+static int ltc2978_write_pmbus_operation(struct regulator_dev *rdev, u8 value)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	int ret;
+
+	ret = pmbus_set_page(client, 0xff);
+	if (ret < 0)
+		return ret;
+
+	return i2c_smbus_write_byte_data(client, PMBUS_OPERATION, value);
+}
+
+static int ltc2978_enable_all(struct regulator_dev *rdev)
+{
+	return ltc2978_write_pmbus_operation(rdev, 0x80);
+}
+
+static int ltc2978_disable_all(struct regulator_dev *rdev)
+{
+	return ltc2978_write_pmbus_operation(rdev, 0);
+}
+
+static int ltc2978_is_enabled(struct regulator_dev *rdev)
+{
+	struct device *dev = rdev_get_dev(rdev);
+	struct i2c_client *client = to_i2c_client(dev->parent);
+	int ret;
+
+	ret = pmbus_set_page(client, 0xff);
+	if (ret < 0)
+		return ret;
+
+	ret = i2c_smbus_read_byte_data(client, PMBUS_OPERATION);
+	if (ret < 0)
+		return ret;
+
+	return !!(ret & 0x80);
+}
+
+static struct regulator_ops ltc2978_regulator_ops = {
+	.enable = ltc2978_enable_all,
+	.disable = ltc2978_disable_all,
+	.is_enabled = ltc2978_is_enabled,
+};
+
+static const struct regulator_desc ltc2978_reg_desc = {
+	.name = "ltc2978",
+	.ops = &ltc2978_regulator_ops,
+	.owner = THIS_MODULE,
+};
+#endif
+
 static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
 {
 	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
@@ -487,6 +542,11 @@ static int ltc2978_probe(struct i2c_client *client,
 	default:
 		return -ENODEV;
 	}
+
+#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
+	info->reg_desc = &ltc2978_reg_desc;
+#endif
+
 	return pmbus_do_probe(client, id, info);
 }
 
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/