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From: Parshuram Thombare <pthombar@cadence.com>
To: <bbrezillon@kernel.org>, <vitor.soares@synopsys.com>
Cc: mparab@cadence.com, Parshuram Thombare <pthombar@cadence.com>,
	praneeth@ti.com, linux-kernel@vger.kernel.org, pgaj@cadence.com,
	linux-i3c@lists.infradead.org
Subject: [PATCH v8 6/7] i3c: master: sysfs key for acquire bus
Date: Sun, 31 May 2020 09:15:46 +0200
Message-ID: <1590909346-7434-1-git-send-email-pthombar@cadence.com> (raw)
In-Reply-To: <1590909063-6013-1-git-send-email-pthombar@cadence.com>

Added support to acquire I3C bus through sysfs interface.

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

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index de3cb39df9ff..17c0c9a6099d 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -596,6 +596,23 @@ 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,
@@ -606,6 +623,7 @@ static struct attribute *i3c_masterdev_attrs[] = {
 	&dev_attr_pid.attr,
 	&dev_attr_dynamic_address.attr,
 	&dev_attr_hdrcap.attr,
+	&dev_attr_i3c_acquire_bus.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(i3c_masterdev);
-- 
2.17.1


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  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-31  7:11 [PATCH v8 0/7] I3C mastership handover support Parshuram Thombare
2020-05-31  7:11 ` [PATCH v8 1/7] i3c: master: master initialization flow document Parshuram Thombare
2020-05-31  7:12 ` [PATCH v8 2/7] i3c: master: use i3c_master_register only for main master Parshuram Thombare
2020-05-31  7:13 ` [PATCH v8 3/7] i3c: master: add i3c_secondary_master_register Parshuram Thombare
2020-05-31  7:14 ` [PATCH v8 4/7] i3c: master: add mastership handover support Parshuram Thombare
2020-05-31  7:15 ` [PATCH v8 5/7] i3c: master: add defslvs processing Parshuram Thombare
2020-05-31  7:15 ` Parshuram Thombare [this message]
2020-05-31  7:16 ` [PATCH v8 7/7] i3c: master: mastership handover, defslvs processing in cdns controller driver Parshuram Thombare

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