linux-kernel - Applied "regulator: core: Add debugfs to show constraint flags" to the regulator tree

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Message-Id: <E1atYej-0002ku-A4@debutante>
Date:	Fri, 22 Apr 2016 11:49:49 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Cc:	Mark Brown <broonie@...nel.org>, broonie@...nel.org,
	lgirdwood@...il.com, linux-kernel@...r.kernel.org,
	patches@...nsource.wolfsonmicro.com
Subject: Applied "regulator: core: Add debugfs to show constraint flags" to the regulator tree

The patch

   regulator: core: Add debugfs to show constraint flags

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 2d80a91b2f2a96f38877bc328dac135d69564911 Mon Sep 17 00:00:00 2001
From: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Date: Thu, 21 Apr 2016 17:23:21 +0100
Subject: [PATCH] regulator: core: Add debugfs to show constraint flags

There are debugfs entries for voltage and current, but not for
the constraint flags. It's useful for debugging to be able to
see what these flags are so this patch adds a new debugfs file.
We can't use debugfs_create_bool for this because the flags are
bitfields, so as this needs a special read callback they have been
collected into a single file that lists all the flags.

Signed-off-by: Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 drivers/regulator/core.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e0b764284773..73381752ff78 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1272,6 +1272,55 @@ static void unset_regulator_supplies(struct regulator_dev *rdev)
 	}
 }
 
+#ifdef CONFIG_DEBUG_FS
+static ssize_t constraint_flags_read_file(struct file *file,
+					  char __user *user_buf,
+					  size_t count, loff_t *ppos)
+{
+	const struct regulator *regulator = file->private_data;
+	const struct regulation_constraints *c = regulator->rdev->constraints;
+	char *buf;
+	ssize_t ret;
+
+	if (!c)
+		return 0;
+
+	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	ret = snprintf(buf, PAGE_SIZE,
+			"always_on: %u\n"
+			"boot_on: %u\n"
+			"apply_uV: %u\n"
+			"ramp_disable: %u\n"
+			"soft_start: %u\n"
+			"pull_down: %u\n"
+			"over_current_protection: %u\n",
+			c->always_on,
+			c->boot_on,
+			c->apply_uV,
+			c->ramp_disable,
+			c->soft_start,
+			c->pull_down,
+			c->over_current_protection);
+
+	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+	kfree(buf);
+
+	return ret;
+}
+
+#endif
+
+static const struct file_operations constraint_flags_fops = {
+#ifdef CONFIG_DEBUG_FS
+	.open = simple_open,
+	.read = constraint_flags_read_file,
+	.llseek = default_llseek,
+#endif
+};
+
 #define REG_STR_SIZE	64
 
 static struct regulator *create_regulator(struct regulator_dev *rdev,
@@ -1327,6 +1376,9 @@ static struct regulator *create_regulator(struct regulator_dev *rdev,
 				   &regulator->min_uV);
 		debugfs_create_u32("max_uV", 0444, regulator->debugfs,
 				   &regulator->max_uV);
+		debugfs_create_file("constraint_flags", 0444,
+				    regulator->debugfs, regulator,
+				    &constraint_flags_fops);
 	}
 
 	/*
-- 
2.8.0.rc3