Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752071AbcDUMGj (ORCPT ); Thu, 21 Apr 2016 08:06:39 -0400 Received: from mx0a-001ae601.pphosted.com ([67.231.149.25]:44037 "EHLO mx0a-001ae601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751849AbcDUMGi (ORCPT ); Thu, 21 Apr 2016 08:06:38 -0400 Authentication-Results: ppops.net; spf=none smtp.mail=rf@opensource.wolfsonmicro.com From: Richard Fitzgerald To: CC: , , Subject: [PATCH] regulator: core: Add debugfs to show constraint flags Date: Thu, 21 Apr 2016 13:06:34 +0100 Message-ID: <1461240394-4080-1-git-send-email-rf@opensource.wolfsonmicro.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=1 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1603290000 definitions=main-1604210197 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2288 Lines: 78 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 --- drivers/regulator/core.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index e0b7642..e0d13fc 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1272,6 +1272,49 @@ static void unset_regulator_supplies(struct regulator_dev *rdev) } } +#ifdef CONFIG_DEBUG_FS +static int 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\nboot_on: %u\napply_uV: %u\nramp_disable: %u\n" + "soft_start: %u\npull_down: %u\nover_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 +1370,9 @@ 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); } /* -- 1.9.1