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Message-Id: <20170824081141.5018-3-tiwai@suse.de>
Date: Thu, 24 Aug 2017 10:11:40 +0200
From: Takashi Iwai <tiwai@...e.de>
To: linux-kernel@...r.kernel.org
Cc: Lee Jones <lee.jones@...aro.org>,
Darren Hart <dvhart@...radead.org>,
Andy Shevchenko <andy@...radead.org>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Johannes Stezenbach <js@...21.net>,
platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: [PATCH v2 2/3] platform/x86: Add support for Dollar Cove TI power button
This provides a new input driver for supporting the power button on
Dollar Cove TI PMIC, found on Cherrytrail-based devices.
The patch is based on the original work by Intel, found at:
https://github.com/01org/ProductionKernelQuilts
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=193891
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
v1->v2:
* Move power-button driver to platform/x86, driver renames accordingly
* Add missing wake-irq cleanup to power-button driver
drivers/platform/x86/Kconfig | 8 +++
drivers/platform/x86/Makefile | 1 +
drivers/platform/x86/intel_dc_ti_pwrbtn.c | 96 +++++++++++++++++++++++++++++++
3 files changed, 105 insertions(+)
create mode 100644 drivers/platform/x86/intel_dc_ti_pwrbtn.c
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 80b87954f6dd..25ab9f6ba533 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1139,6 +1139,14 @@ config SILEAD_DMI
with the OS-image for the device. This option supplies the missing
information. Enable this for x86 tablets with Silead touchscreens.
+config INTEL_DC_TI_PWRBTN
+ tristate "Dollar Cove TI power button driver"
+ depends on INTEL_SOC_PMIC_DC_TI
+ depends on INPUT
+ help
+ Say Y here fi you want to have a power button driver for
+ Dollar Cove TI PMIC.
+
endif # X86_PLATFORM_DEVICES
config PMC_ATOM
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 91cec1751461..1ce5c18d249e 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -83,3 +83,4 @@ obj-$(CONFIG_PMC_ATOM) += pmc_atom.o
obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
obj-$(CONFIG_MLX_CPLD_PLATFORM) += mlxcpld-hotplug.o
obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
+obj-$(CONFIG_INTEL_DC_TI_PWRBTN) += intel_dc_ti_pwrbtn.o
diff --git a/drivers/platform/x86/intel_dc_ti_pwrbtn.c b/drivers/platform/x86/intel_dc_ti_pwrbtn.c
new file mode 100644
index 000000000000..1a40f55699fb
--- /dev/null
+++ b/drivers/platform/x86/intel_dc_ti_pwrbtn.c
@@ -0,0 +1,96 @@
+/*
+ * Power-button driver for Dollar Cove TI PMIC
+ * Copyright (C) 2014 Intel Corp
+ * Copyright (c) 2017 Takashi Iwai <tiwai@...e.de>
+ */
+
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/slab.h>
+
+#define DC_TI_SIRQ_REG 0x3
+#define SIRQ_PWRBTN_REL (1 << 0)
+
+static irqreturn_t dc_ti_pwrbtn_interrupt(int irq, void *dev_id)
+{
+ struct input_dev *input = dev_id;
+ struct device *dev = input->dev.parent;
+ struct regmap *regmap = dev_get_drvdata(dev);
+ int state;
+
+ if (!regmap_read(regmap, DC_TI_SIRQ_REG, &state)) {
+ dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
+ state &= SIRQ_PWRBTN_REL;
+ input_event(input, EV_KEY, KEY_POWER, !state);
+ input_sync(input);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int dc_ti_pwrbtn_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
+ struct input_dev *input;
+ int irq;
+ int ret;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ return -EINVAL;
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+ input->name = pdev->name;
+ input->phys = "power-button/input0";
+ input->id.bustype = BUS_HOST;
+ input->dev.parent = dev;
+ input_set_capability(input, EV_KEY, KEY_POWER);
+ ret = input_register_device(input);
+ if (ret)
+ return ret;
+
+ dev_set_drvdata(dev, pmic->regmap);
+
+ ret = devm_request_threaded_irq(dev, irq, NULL, dc_ti_pwrbtn_interrupt,
+ 0, KBUILD_MODNAME, input);
+ if (ret)
+ return ret;
+
+ device_init_wakeup(dev, true);
+ dev_pm_set_wake_irq(dev, irq);
+ return 0;
+}
+
+static int dc_ti_pwrbtn_remove(struct platform_device *pdev)
+{
+ dev_pm_clear_wake_irq(&pdev->dev);
+ device_init_wakeup(&pdev->dev, false);
+ return 0;
+}
+
+static struct platform_device_id dc_ti_pwrbtn_id_table[] = {
+ { .name = "dc_ti_pwrbtn" },
+ {},
+};
+MODULE_DEVICE_TABLE(platform, dc_ti_pwrbtn_id_table);
+
+static struct platform_driver dc_ti_pwrbtn_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ },
+ .probe = dc_ti_pwrbtn_probe,
+ .remove = dc_ti_pwrbtn_remove,
+ .id_table = dc_ti_pwrbtn_id_table,
+};
+module_platform_driver(dc_ti_pwrbtn_driver);
+
+MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
+MODULE_LICENSE("GPL v2");
--
2.14.0
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