linux-kernel - [PATCH v10 6/7] i3c: master: sysfs key for acquire bus

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Date:   Mon, 30 Nov 2020 07:20:02 +0100
From:   Parshuram Thombare <pthombar@...ence.com>
To:     <alexandre.belloni@...tlin.com>, <slongerbeam@...il.com>,
        <vitor.soares@...opsys.com>
CC:     <linux-i3c@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <mparab@...ence.com>, <praneeth@...com>,
        Parshuram Thombare <pthombar@...ence.com>
Subject: [PATCH v10 6/7] i3c: master: sysfs key for acquire bus

Added support to acquire I3C bus through sysfs interface.

Signed-off-by: Parshuram Thombare <pthombar@...ence.com>
---
 drivers/i3c/master.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index c01ba00..beb7495 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -581,6 +581,23 @@ static ssize_t i2c_scl_frequency_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(i2c_scl_frequency);
 
+static ssize_t i3c_acquire_bus_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	struct i3c_master_controller *master = dev_to_i3cmaster(dev);
+	int ret;
+
+	i3c_bus_normaluse_lock(&master->bus);
+	ret = i3c_master_acquire_bus(master);
+	i3c_bus_normaluse_unlock(&master->bus);
+	if (!ret)
+		i3c_master_enable_mr_events(master);
+
+	return ret ?: count;
+}
+static DEVICE_ATTR_WO(i3c_acquire_bus);
+
 static struct attribute *i3c_masterdev_attrs[] = {
 	&dev_attr_mode.attr,
 	&dev_attr_current_master.attr,
@@ -591,6 +608,7 @@ static ssize_t i2c_scl_frequency_show(struct device *dev,
 	&dev_attr_pid.attr,
 	&dev_attr_dynamic_address.attr,
 	&dev_attr_hdrcap.attr,
+	&dev_attr_i3c_acquire_bus.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(i3c_masterdev);
-- 
1.7.1