From 2d80a91b2f2a96f38877bc328dac135d69564911 Mon Sep 17 00:00:00 2001 From: Richard Fitzgerald 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 Signed-off-by: Mark Brown --- 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, ®ulator->min_uV); debugfs_create_u32("max_uV", 0444, regulator->debugfs, ®ulator->max_uV); + debugfs_create_file("constraint_flags", 0444, + regulator->debugfs, regulator, + &constraint_flags_fops); } /* -- 2.20.1