[PATCH v3 10/12] usb: typec: driver for Pericom PI3USB30532 Type-C cross switch

Hans de Goede
2018-02-26T09:09:23Z

Add a driver for the Pericom PI3USB30532 Type-C cross switch /
mux chip found on some devices with a Type-C port.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
-Cleanup pi3usb30532_set_conf() error handling
-Add Heikki's Reviewed-by

Changes in v1:
-This is a rewrite of my previous driver which was using the
drivers/mux framework to use the new drivers/usb/typec/mux framework
---
MAINTAINERS | 6 ++
drivers/usb/typec/Kconfig | 2 +
drivers/usb/typec/Makefile | 1 +
drivers/usb/typec/mux/Kconfig | 10 ++
drivers/usb/typec/mux/Makefile | 3 +
drivers/usb/typec/mux/pi3usb30532.c | 178 ++++++++++++++++++++++++++++++++++++
6 files changed, 200 insertions(+)
create mode 100644 drivers/usb/typec/mux/Kconfig
create mode 100644 drivers/usb/typec/mux/Makefile
create mode 100644 drivers/usb/typec/mux/pi3usb30532.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 523f14b4216d..cc66ac1b9ee0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14530,6 +14530,12 @@ F: drivers/usb/
F: include/linux/usb.h
F: include/linux/usb/

+USB TYPEC PI3USB30532 MUX DRIVER
+M: Hans de Goede <hdegoede@redhat.com>
+L: linux-usb@vger.kernel.org
+S: Maintained
+F: drivers/usb/typec/mux/pi3usb30532.c
+
USB TYPEC SUBSYSTEM
M: Heikki Krogerus <heikki.krogerus@linux.intel.com>
L: linux-usb@vger.kernel.org
diff --git a/drivers/usb/typec/Kconfig b/drivers/usb/typec/Kconfig
index a2a0684e7c82..030f88cb0c3f 100644
--- a/drivers/usb/typec/Kconfig
+++ b/drivers/usb/typec/Kconfig
@@ -85,4 +85,6 @@ config TYPEC_TPS6598X
If you choose to build this driver as a dynamically linked module, the
module will be called tps6598x.ko.

+source "drivers/usb/typec/mux/Kconfig"
+
endif # TYPEC
diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
index 56b2e9516ec1..1f599a6c30cc 100644
--- a/drivers/usb/typec/Makefile
+++ b/drivers/usb/typec/Makefile
@@ -6,3 +6,4 @@ obj-y += fusb302/
obj-$(CONFIG_TYPEC_WCOVE) += typec_wcove.o
obj-$(CONFIG_TYPEC_UCSI) += ucsi/
obj-$(CONFIG_TYPEC_TPS6598X) += tps6598x.o
+obj-$(CONFIG_TYPEC) += mux/
diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig
new file mode 100644
index 000000000000..9a954d2b8d8f
--- /dev/null
+++ b/drivers/usb/typec/mux/Kconfig
@@ -0,0 +1,10 @@
+menu "USB Type-C Multiplexer/DeMultiplexer Switch support"
+
+config TYPEC_MUX_PI3USB30532
+ tristate "Pericom PI3USB30532 Type-C cross switch driver"
+ depends on I2C
+ help
+ Say Y or M if your system has a Pericom PI3USB30532 Type-C cross
+ switch / mux chip found on some devices with a Type-C port.
+
+endmenu
diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile
new file mode 100644
index 000000000000..1332e469b8a0
--- /dev/null
+++ b/drivers/usb/typec/mux/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o
diff --git a/drivers/usb/typec/mux/pi3usb30532.c b/drivers/usb/typec/mux/pi3usb30532.c
new file mode 100644
index 000000000000..86cda9f388f3
--- /dev/null
+++ b/drivers/usb/typec/mux/pi3usb30532.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Pericom PI3USB30532 Type-C cross switch / mux driver
+ *
+ * Copyright (c) 2017-2018 Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/usb/tcpm.h>
+#include <linux/usb/typec_mux.h>
+
+#define PI3USB30532_CONF 0x00
+
+#define PI3USB30532_CONF_OPEN 0x00
+#define PI3USB30532_CONF_SWAP 0x01
+#define PI3USB30532_CONF_4LANE_DP 0x02
+#define PI3USB30532_CONF_USB3 0x04
+#define PI3USB30532_CONF_USB3_AND_2LANE_DP 0x06
+
+struct pi3usb30532 {
+ struct i2c_client *client;
+ struct mutex lock; /* protects the cached conf register */
+ struct typec_switch sw;
+ struct typec_mux mux;
+ u8 conf;
+};
+
+static int pi3usb30532_set_conf(struct pi3usb30532 *pi, u8 new_conf)
+{
+ int ret = 0;
+
+ if (pi->conf == new_conf)
+ return 0;
+
+ ret = i2c_smbus_write_byte_data(pi->client, PI3USB30532_CONF, new_conf);
+ if (ret) {
+ dev_err(&pi->client->dev, "Error writing conf: %d\n", ret);
+ return ret;
+ }
+
+ pi->conf = new_conf;
+ return 0;
+}
+
+static int pi3usb30532_sw_set(struct typec_switch *sw,
+ enum typec_orientation orientation)
+{
+ struct pi3usb30532 *pi = container_of(sw, struct pi3usb30532, sw);
+ u8 new_conf;
+ int ret;
+
+ mutex_lock(&pi->lock);
+ new_conf = pi->conf;
+
+ switch (orientation) {
+ case TYPEC_ORIENTATION_NONE:
+ new_conf = PI3USB30532_CONF_OPEN;
+ break;
+ case TYPEC_ORIENTATION_NORMAL:
+ new_conf &= ~PI3USB30532_CONF_SWAP;
+ break;
+ case TYPEC_ORIENTATION_REVERSE:
+ new_conf |= PI3USB30532_CONF_SWAP;
+ break;
+ };
+
+ ret = pi3usb30532_set_conf(pi, new_conf);
+ mutex_unlock(&pi->lock);
+
+ return ret;
+}
+
+static int pi3usb30532_mux_set(struct typec_mux *mux, int state)
+{
+ struct pi3usb30532 *pi = container_of(mux, struct pi3usb30532, mux);
+ u8 new_conf;
+ int ret;
+
+ mutex_lock(&pi->lock);
+ new_conf = pi->conf;
+
+ switch (state) {
+ case TYPEC_MUX_NONE:
+ new_conf = PI3USB30532_CONF_OPEN;
+ break;
+ case TYPEC_MUX_USB:
+ new_conf = (new_conf & PI3USB30532_CONF_SWAP) |
+ PI3USB30532_CONF_USB3;
+ break;
+ case TYPEC_MUX_DP:
+ new_conf = (new_conf & PI3USB30532_CONF_SWAP) |
+ PI3USB30532_CONF_4LANE_DP;
+ break;
+ case TYPEC_MUX_DOCK:
+ new_conf = (new_conf & PI3USB30532_CONF_SWAP) |
+ PI3USB30532_CONF_USB3_AND_2LANE_DP;
+ break;
+ };
+
+ ret = pi3usb30532_set_conf(pi, new_conf);
+ mutex_unlock(&pi->lock);
+
+ return ret;
+}
+
+static int pi3usb30532_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct pi3usb30532 *pi;
+ int ret;
+
+ pi = devm_kzalloc(dev, sizeof(*pi), GFP_KERNEL);
+ if (!pi)
+ return -ENOMEM;
+
+ pi->client = client;
+ pi->sw.dev = dev;
+ pi->sw.set = pi3usb30532_sw_set;
+ pi->mux.dev = dev;
+ pi->mux.set = pi3usb30532_mux_set;
+ mutex_init(&pi->lock);
+
+ ret = i2c_smbus_read_byte_data(client, PI3USB30532_CONF);
+ if (ret < 0) {
+ dev_err(dev, "Error reading config register %d\n", ret);
+ return ret;
+ }
+ pi->conf = ret;
+
+ ret = typec_switch_register(&pi->sw);
+ if (ret) {
+ dev_err(dev, "Error registering typec switch: %d\n", ret);
+ return ret;
+ }
+
+ ret = typec_mux_register(&pi->mux);
+ if (ret) {
+ typec_switch_unregister(&pi->sw);
+ dev_err(dev, "Error registering typec mux: %d\n", ret);
+ return ret;
+ }
+
+ i2c_set_clientdata(client, pi);
+ return 0;
+}
+
+static int pi3usb30532_remove(struct i2c_client *client)
+{
+ struct pi3usb30532 *pi = i2c_get_clientdata(client);
+
+ typec_mux_unregister(&pi->mux);
+ typec_switch_unregister(&pi->sw);
+ return 0;
+}
+
+static const struct i2c_device_id pi3usb30532_table[] = {
+ { "pi3usb30532" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, pi3usb30532_table);
+
+static struct i2c_driver pi3usb30532_driver = {
+ .driver = {
+ .name = "pi3usb30532",
+ },
+ .probe_new = pi3usb30532_probe,
+ .remove = pi3usb30532_remove,
+ .id_table = pi3usb30532_table,
+};
+
+module_i2c_driver(pi3usb30532_driver);
+
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_DESCRIPTION("Pericom PI3USB30532 Type-C mux driver");
+MODULE_LICENSE("GPL");
--
2.14.3