This patch adds a simple typec switch driver for cases which only
needs some simple operations but a dedicated driver is required,
current driver only supports GPIO toggle to switch the super speed
active channel according to typec orientation.
Signed-off-by: Li Jun <jun.li@xxxxxxx>
---
Changes for v6:
- Use general mux control for typec switch, currently only support
max 2 GPIOs to control one typec switch with 3 states: orientation
normal(cc1), reverse(cc2), none(deselected both channels).
Changes for v5:
- A few changes address Andy's comment, remove gpio check as it's
optional, add module name for Kconfig, use correct header files,
and other minor changes.
- Remove the mutex lock as it's not required currently.
Changes for v4:
- Change driver name to be switch simple from switch GPIO, to make it
generic for possible extention.
- Use compatiable "typec-orientation-switch" instead of bool property
for switch matching.
- Make acitve channel selection GPIO to be optional.
- Remove Andy's R-b tag since the driver changes a lot.
Change for v3:
- Remove file name in driver description.
- Add Andy Shevchenko's Reviewed-by tag.
Changes for v2:
- Use the correct head files for gpio api and of_device_id:
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
- Add driver dependency on GPIOLIB
drivers/usb/typec/mux/Kconfig | 10 +++
drivers/usb/typec/mux/Makefile | 1 +
drivers/usb/typec/mux/switch-simple.c | 126 ++++++++++++++++++++++++++++++++++
3 files changed, 137 insertions(+)
diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig
index a4dbd11..11320d7 100644
--- a/drivers/usb/typec/mux/Kconfig
+++ b/drivers/usb/typec/mux/Kconfig
@@ -18,4 +18,14 @@ 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_SWITCH_SIMPLE
+ tristate "Type-C orientation switch simple driver"
+ depends on GPIOLIB
+ help
+ Say Y or M if your system need a simple driver for typec switch
+ control, like use GPIO to select active channel.
+
+ To compile this driver as a module, choose M here: the
+ module will be called switch-simple.
+
endmenu
diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile
index 280a6f5..712d0ad 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_SWITCH_SIMPLE) += switch-simple.o
diff --git a/drivers/usb/typec/mux/switch-simple.c b/drivers/usb/typec/mux/switch-simple.c
new file mode 100644
index 0000000..4671169
--- /dev/null
+++ b/drivers/usb/typec/mux/switch-simple.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Type-C switch simple control driver
+ *
+ * Copyright 2020 NXP
+ * Author: Jun Li <jun.li@xxxxxxx>
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/mux/driver.h>
+#include <linux/platform_device.h>
+#include <linux/usb/typec_mux.h>
+
+struct typec_switch_simple {
+ struct typec_switch *sw;
+ struct mux_control *mux;
+ struct gpio_descs *switch_gpios;
+};
+
+static int typec_switch_simple_mux_set(struct mux_control *mux, int state)
+{
+ struct typec_switch_simple *typec_ss = mux_chip_priv(mux->chip);
+ DECLARE_BITMAP(values, BITS_PER_TYPE(state));
+
+ values[0] = state;
+ gpiod_set_array_value_cansleep(typec_ss->switch_gpios->ndescs,
+ typec_ss->switch_gpios->desc,
+ typec_ss->switch_gpios->info,
+ values);
+
+ return 0;
+}
+
+static const struct mux_control_ops typec_switch_mux_ops = {
+ .set = typec_switch_simple_mux_set,
+};
+
+static int typec_switch_simple_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mux_chip *mux_chip;
+ struct typec_switch_desc sw_desc;
+ struct typec_switch_simple *typec_ss;
+ int idle_state;
+ int pins;
+ int ret;
+
+ pins = gpiod_count(dev, "switch");
+ mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*typec_ss));
+ if (IS_ERR(mux_chip))
+ return PTR_ERR(mux_chip);
+
+ typec_ss = mux_chip_priv(mux_chip);
+ mux_chip->ops = &typec_switch_mux_ops;
+
+ /* Get the super speed active channel selection GPIO */
+ typec_ss->switch_gpios = devm_gpiod_get_array_optional(dev,
+ "switch", GPIOD_OUT_LOW);
+ if (IS_ERR(typec_ss->switch_gpios))
+ return PTR_ERR(typec_ss->switch_gpios);
+
+ if (pins) {
+ WARN_ON(pins != typec_ss->switch_gpios->ndescs || pins > 2);
+ mux_chip->mux->states = pins + 1;
+ }
+
+ ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);
+ if (ret >= 0 && idle_state != MUX_IDLE_AS_IS) {
+ if (idle_state < 0 || idle_state >= mux_chip->mux->states) {
+ dev_err(dev, "invalid idle-state %u\n", idle_state);
+ return -EINVAL;
+ }
+ mux_chip->mux->idle_state = idle_state;
+ }
+
+ ret = devm_mux_chip_register(dev, mux_chip);
+ if (ret < 0)
+ return ret;
+
+ platform_set_drvdata(pdev, typec_ss);
+ sw_desc.drvdata = typec_ss;
+ sw_desc.fwnode = dev->fwnode;
+
+ typec_ss->sw = typec_switch_register(&mux_chip->dev, &sw_desc);
+ if (IS_ERR(typec_ss->sw)) {
+ dev_err(dev, "Error registering typec switch: %ld\n",
+ PTR_ERR(typec_ss->sw));
+ return PTR_ERR(typec_ss->sw);
+ }
+
+ return 0;
+}
+
+static int typec_switch_simple_remove(struct platform_device *pdev)
+{
+ struct typec_switch_simple *typec_ss = platform_get_drvdata(pdev);
+
+ typec_switch_unregister(typec_ss->sw);
+
+ return 0;
+}
+
+static const struct of_device_id of_typec_switch_simple_match[] = {
+ { .compatible = "typec-orientation-switch" },
+ { /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_typec_switch_simple_match);
+
+static struct platform_driver typec_switch_simple_driver = {
+ .probe = typec_switch_simple_probe,
+ .remove = typec_switch_simple_remove,
+ .driver = {
+ .name = "typec-switch-simple",
+ .of_match_table = of_typec_switch_simple_match,
+ },
+};
+
+module_platform_driver(typec_switch_simple_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("TypeC Orientation Switch Simple driver");
+MODULE_AUTHOR("Jun Li <jun.li@xxxxxxx>");
--
2.7.4
