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Message-Id: <20220301132010.115258-5-alvin@pqrs.dk>
Date: Tue, 1 Mar 2022 14:20:08 +0100
From: Alvin Ε ipraga <alvin@...s.dk>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Rob Herring <robh+dt@...nel.org>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
ipraga <alsi@...g-olufsen.dk>
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] usb: typec: mux: add TS5USBA224 driver
From: Alvin Ε ipraga <alsi@...g-olufsen.dk>
The TS5USBA224 USB High Speed/Audio switch mux is typically used
together with a Type-C port controller such as the TUSB320LAI. Below is
a simplified typical application on an embedded platform:
βββββββββββββββββββββββ βββββββββββββββββββββ
β β I2C β β
β ββββββββββββββββββββββββ€ I2C β
β TUSB320LAI β INT_N β β
β ββββββββββββββββββββββββ€ System-on- β
β β β Chip β
β CC1 CC2 β ββββββββββββ€ GPIO β
ββββ¬ββββ¬βββββββββββββββ β β β
β β β β USBOTG β
β β β β VBUS D+ D- β
β β β ββββββββ¬ββββββ¬ββββ¬βββ
β β ββββββββββββββββββββββββββββββββββββββββββ β β
β β β βββββββββββββ΄βββ β β
β β β β A_SEL β β β
β β β β β β β
β β β β D+ ββββββββββββββββββββββ β
β β β β β β
β β β ββββββββ€ D+/L D- ββββββββββββββββββββββββββ
β β β β β β
β β β β ββββ€ D-/R β Line_L
β β β β β β L ββββββββββββββββββββββββββ
β΄ β΄ β΄ β΄ β΄ β β Line_R
USB Type-C port β R ββββββββββββββββββββββββββ
β β
β TS5USBA224 β
ββββββββββββββββ
This driver controls the TS5USBA224 via the A_SEL pin. In addition, it
registers itself as a Type-C mux device. In the above scenario, the
driver may be notified via the port controller driver if the CC pins
indicate that an Audio Accessory is connected or not.
Signed-off-by: Alvin Ε ipraga <alsi@...g-olufsen.dk>
---
drivers/usb/typec/mux/Kconfig | 10 +++
drivers/usb/typec/mux/Makefile | 1 +
drivers/usb/typec/mux/ts5usba224.c | 102 +++++++++++++++++++++++++++++
3 files changed, 113 insertions(+)
create mode 100644 drivers/usb/typec/mux/ts5usba224.c
diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig
index edead555835e..82c25b117652 100644
--- a/drivers/usb/typec/mux/Kconfig
+++ b/drivers/usb/typec/mux/Kconfig
@@ -19,4 +19,14 @@ config TYPEC_MUX_INTEL_PMC
control the USB role switch and also the multiplexer/demultiplexer
switches used with USB Type-C Alternate Modes.
+config TYPEC_MUX_TS5USBA224
+ tristate "TI TS5USBA224 USB High Speed/Audio switch mux driver"
+ select GPIOLIB
+ help
+ Say Y or M if your system has a TI TS5USBA224 USB High Speed/Audio
+ switch mux controller paired with a USB Type-C port controller.
+
+ If you choose to build this driver as a dynamically linked module, the
+ module will be called ts5usba224.ko.
+
endmenu
diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile
index 280a6f553115..4b5f318656a0 100644
--- a/drivers/usb/typec/mux/Makefile
+++ b/drivers/usb/typec/mux/Makefile
@@ -2,3 +2,4 @@
obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o
obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o
+obj-$(CONFIG_TYPEC_MUX_TS5USBA224) += ts5usba224.o
diff --git a/drivers/usb/typec/mux/ts5usba224.c b/drivers/usb/typec/mux/ts5usba224.c
new file mode 100644
index 000000000000..4935dc8a0725
--- /dev/null
+++ b/drivers/usb/typec/mux/ts5usba224.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * TI TS5USBA224 USB 2.0/audio switch mux driver
+ *
+ * Copyright (c) 2021 Alvin Ε ipraga <alsi@...g-olufsen.dk>
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/usb/typec_altmode.h>
+#include <linux/usb/typec_mux.h>
+
+struct ts5usba224 {
+ struct device *dev;
+ struct typec_mux *mux;
+ struct gpio_desc *a_sel;
+};
+
+static int ts5usba224_mux_set(struct typec_mux *mux,
+ struct typec_mux_state *state)
+{
+ struct ts5usba224 *chip = typec_mux_get_drvdata(mux);
+
+ switch (state->mode) {
+ case TYPEC_MODE_AUDIO:
+ gpiod_set_value_cansleep(chip->a_sel, 1);
+ dev_dbg(chip->dev, "audio switch enabled\n");
+ break;
+ case TYPEC_STATE_USB:
+ case TYPEC_MODE_USB2:
+ default:
+ dev_dbg(chip->dev, "audio switch disabled\n");
+ gpiod_set_value_cansleep(chip->a_sel, 0);
+ break;
+ }
+
+ return 0;
+}
+
+static int ts5usba224_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct typec_mux_desc mux_desc = {};
+ struct ts5usba224 *chip;
+ int ret;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->dev = dev;
+
+ chip->a_sel = devm_gpiod_get(dev, "asel", GPIOD_OUT_LOW);
+ if (IS_ERR(chip->a_sel)) {
+ ret = PTR_ERR(chip->a_sel);
+ return dev_err_probe(dev, ret, "failed to get A_SEL GPIO\n");
+ }
+
+ mux_desc.drvdata = chip;
+ mux_desc.fwnode = dev->fwnode;
+ mux_desc.set = ts5usba224_mux_set;
+
+ chip->mux = typec_mux_register(dev, &mux_desc);
+ if (IS_ERR(chip->mux))
+ return PTR_ERR(chip->mux);
+
+ platform_set_drvdata(pdev, chip);
+
+ return 0;
+}
+
+static int ts5usba224_remove(struct platform_device *pdev)
+{
+ struct ts5usba224 *chip = platform_get_drvdata(pdev);
+
+ typec_mux_unregister(chip->mux);
+
+ return 0;
+}
+
+static const struct of_device_id ts5usba224_of_match[] = {
+ { .compatible = "ti,ts5usba224", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ts5usba224_of_match);
+
+static struct platform_driver ts5usba224_driver = {
+ .driver = {
+ .name = "ts5usba224",
+ .of_match_table = of_match_ptr(ts5usba224_of_match),
+ },
+ .probe = ts5usba224_probe,
+ .remove = ts5usba224_remove,
+};
+
+module_platform_driver(ts5usba224_driver);
+
+MODULE_AUTHOR("Alvin Ε ipraga <alsi@...g-olufsen.dk>");
+MODULE_DESCRIPTION("TI TS5USBA224 mux driver");
+MODULE_LICENSE("GPL");
--
2.35.1
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