[PATCH] platform/x86: Add new intel_atomisp2_led driver

From: Hans de Goede
Date: Sat May 09 2020 - 09:07:17 EST

Many Bay Trail and Cherry Trail devices come with a camera attached to
Intel's Image Signal Processor. Linux currently does not have a driver for
these, so they do not work as a camera.

Some of these camera's have a status LED which is controlled through a GPIO
in some cases, e.g. on the Asus T100TA and Asus T200TA, there is a firmware
issue where the LED gets turned on at boot.

This commit adds a Linux LED driver for the camera LED on these devices.
This driver will turn the LED off at boot and also allows controlling the
LED (so the user can repurpose it) through the sysfs LED interface.

Which GPIO is attached to the LED is usually not described in the ACPI
tables, so this driver contains per-system info about the GPIO inside the
driver. This means that this driver only works on systems the driver knows
about.

Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
MAINTAINERS | 6 ++
drivers/platform/x86/Kconfig | 21 ++++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/intel_atomisp2_led.c | 118 ++++++++++++++++++++++
4 files changed, 146 insertions(+)
create mode 100644 drivers/platform/x86/intel_atomisp2_led.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 2926327e4976..d85e009260ec 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8499,6 +8499,12 @@ L: platform-driver-x86@xxxxxxxxxxxxxxx
S: Maintained
F: drivers/platform/x86/intel_atomisp2_pm.c

+INTEL ATOMISP2 LED DRIVER
+M: Hans de Goede <hdegoede@xxxxxxxxxx>
+L: platform-driver-x86@xxxxxxxxxxxxxxx
+S: Maintained
+F: drivers/platform/x86/intel_atomisp2_led.c
+
INTEL C600 SERIES SAS CONTROLLER DRIVER
M: Intel SCU Linux support <intel-linux-scu@xxxxxxxxx>
M: Artur Paszkiewicz <artur.paszkiewicz@xxxxxxxxx>
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 0ad7ad8cf8e1..1af4c97447a2 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -750,6 +750,27 @@ config INTEL_ATOMISP2_PM
To compile this driver as a module, choose M here: the module
will be called intel_atomisp2_pm.

+config INTEL_ATOMISP2_LED
+ tristate "Intel AtomISP2 camera LED driver"
+ depends on GPIOLIB && LEDS_GPIO
+ help
+ Many Bay Trail and Cherry Trail devices come with a camera attached
+ to Intel's Image Signal Processor. Linux currently does not have a
+ driver for these, so they do not work as a camera. Some of these
+ camera's have a LED which is controlled through a GPIO.
+
+ Some of these devices have a firmware issue where the LED gets turned
+ on at boot. This driver will turn the LED off at boot and also allows
+ controlling the LED (repurposing it) through the sysfs LED interface.
+
+ Which GPIO is attached to the LED is usually not described in the
+ ACPI tables, so this driver contains per-system info about the GPIO
+ inside the driver, this means that this driver only works on systems
+ the driver knows about.
+
+ To compile this driver as a module, choose M here: the module
+ will be called intel_atomisp2_led.
+
config INTEL_CHT_INT33FE
tristate "Intel Cherry Trail ACPI INT33FE Driver"
depends on X86 && ACPI && I2C && REGULATOR
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 53408d965874..969581237abb 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o

# Intel
obj-$(CONFIG_INTEL_ATOMISP2_PM) += intel_atomisp2_pm.o
+obj-$(CONFIG_INTEL_ATOMISP2_LED) += intel_atomisp2_led.o
obj-$(CONFIG_INTEL_CHT_INT33FE) += intel_cht_int33fe.o
intel_cht_int33fe-objs := intel_cht_int33fe_common.o \
intel_cht_int33fe_typec.o \
diff --git a/drivers/platform/x86/intel_atomisp2_led.c b/drivers/platform/x86/intel_atomisp2_led.c
new file mode 100644
index 000000000000..fb704956cd9d
--- /dev/null
+++ b/drivers/platform/x86/intel_atomisp2_led.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for controlling LEDs for cameras connected to the Intel atomisp2
+ * The main purpose of this driver is to turn off LEDs which are on at boot.
+ *
+ * Copyright (C) 2020 Hans de Goede <hdegoede@xxxxxxxxxx>
+ */
+
+#include <linux/dmi.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/machine.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+
+/* This must be leds-gpio as the leds-gpio driver binds to the name */
+#define DEV_NAME "leds-gpio"
+
+static const struct gpio_led atomisp2_leds[] = {
+ {
+ .name = "atomisp2::camera",
+ .default_state = LEDS_GPIO_DEFSTATE_OFF,
+ },
+};
+
+static const struct gpio_led_platform_data atomisp2_leds_pdata = {
+ .num_leds = ARRAY_SIZE(atomisp2_leds),
+ .leds = atomisp2_leds,
+};
+
+static struct gpiod_lookup_table asus_t100ta_lookup = {
+ .dev_id = DEV_NAME,
+ .table = {
+ GPIO_LOOKUP_IDX("INT33FC:02", 8, NULL, 0, GPIO_ACTIVE_HIGH),
+ { }
+ }
+};
+
+static struct gpiod_lookup_table asus_t100chi_lookup = {
+ .dev_id = DEV_NAME,
+ .table = {
+ GPIO_LOOKUP_IDX("INT33FC:01", 24, NULL, 0, GPIO_ACTIVE_HIGH),
+ { }
+ }
+};
+
+static const struct dmi_system_id atomisp2_led_systems[] __initconst = {
+ {
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100TA"),
+ },
+ .driver_data = &asus_t100ta_lookup,
+ },
+ {
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T200TA"),
+ },
+ .driver_data = &asus_t100ta_lookup,
+ },
+ {
+ .matches = {
+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "T100CHI"),
+ },
+ .driver_data = &asus_t100chi_lookup,
+ },
+ {} /* Terminating entry */
+};
+MODULE_DEVICE_TABLE(dmi, atomisp2_led_systems);
+
+static struct gpiod_lookup_table *gpio_lookup;
+static struct platform_device *pdev;
+
+static int __init atomisp2_led_init(void)
+{
+ const struct dmi_system_id *system;
+
+ system = dmi_first_match(atomisp2_led_systems);
+ if (!system)
+ return -ENODEV;
+
+ gpio_lookup = system->driver_data;
+ gpiod_add_lookup_table(gpio_lookup);
+
+ pdev = platform_device_register_resndata(NULL,
+ DEV_NAME, PLATFORM_DEVID_NONE,
+ NULL, 0, &atomisp2_leds_pdata,
+ sizeof(atomisp2_leds_pdata));
+ if (IS_ERR(pdev)) {
+ gpiod_remove_lookup_table(gpio_lookup);
+ return PTR_ERR(pdev);
+ }
+
+ return 0;
+}
+
+static void __exit atomisp2_led_cleanup(void)
+{
+ platform_device_unregister(pdev);
+ gpiod_remove_lookup_table(gpio_lookup);
+}
+
+module_init(atomisp2_led_init);
+module_exit(atomisp2_led_cleanup);
+
+/*
+ * The ACPI INIT method from Asus WMI's code on the T100TA and T200TA turns the
+ * LED on (without the WMI interface allowing further control over the LED).
+ * Ensure we are loaded after asus-nb-wmi so that we turn the LED off again.
+ */
+MODULE_SOFTDEP("pre: asus_nb_wmi");
+MODULE_AUTHOR("Hans de Goede <hdegoede@xxxxxxxxxx");
+MODULE_DESCRIPTION("Intel atomisp2 camera LED driver");
+MODULE_LICENSE("GPL");
--
2.26.0