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
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 9d2a6d6..88bf2f4 100644 (file)
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1184,6 +1184,17 @@ 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_CHTDC_TI_PWRBTN
+       tristate "Intel Cherry Trail Dollar Cove TI power button driver"
+       depends on INTEL_SOC_PMIC_CHTDC_TI
+       depends on INPUT
+       ---help---
+         This option adds a power button driver driver for Dollar Cove TI
+         PMIC on Intel Cherry Trail devices.
+
+         To compile this driver as a module, choose M here: the module
+         will be called intel_chtdc_ti_pwrbtn.
+
 endif # X86_PLATFORM_DEVICES
 
 config PMC_ATOM

diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 2996536..4f92dbf 100644 (file)
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -89,3 +89,4 @@ 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_CHTDC_TI_PWRBTN)    += intel_chtdc_ti_pwrbtn.o

diff --git a/drivers/platform/x86/intel_chtdc_ti_pwrbtn.c b/drivers/platform/x86/intel_chtdc_ti_pwrbtn.c
new file mode 100644 (file)
index 0000000..38b8e7c
--- /dev/null
+++ b/drivers/platform/x86/intel_chtdc_ti_pwrbtn.c
@@ -0,0 +1,93 @@
+/*
+ * Power-button driver for Dollar Cove TI PMIC
+ * Copyright (C) 2014 Intel Corp
+ * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
+ */
+
+#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 CHTDC_TI_SIRQ_REG      0x3
+#define SIRQ_PWRBTN_REL                BIT(0)
+
+static irqreturn_t chtdc_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, CHTDC_TI_SIRQ_REG, &state)) {
+               dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
+               input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));
+               input_sync(input);
+       }
+
+       return IRQ_HANDLED;
+}
+
+static int chtdc_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, err;
+
+       irq = platform_get_irq(pdev, 0);
+       if (irq < 0)
+               return irq;
+       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_set_capability(input, EV_KEY, KEY_POWER);
+       err = input_register_device(input);
+       if (err)
+               return err;
+
+       dev_set_drvdata(dev, pmic->regmap);
+
+       err = devm_request_threaded_irq(dev, irq, NULL,
+                                       chtdc_ti_pwrbtn_interrupt,
+                                       0, KBUILD_MODNAME, input);
+       if (err)
+               return err;
+
+       device_init_wakeup(dev, true);
+       dev_pm_set_wake_irq(dev, irq);
+       return 0;
+}
+
+static int chtdc_ti_pwrbtn_remove(struct platform_device *pdev)
+{
+       dev_pm_clear_wake_irq(&pdev->dev);
+       device_init_wakeup(&pdev->dev, false);
+       return 0;
+}
+
+static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
+       { .name = "chtdc_ti_pwrbtn" },
+       {},
+};
+MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);
+
+static struct platform_driver chtdc_ti_pwrbtn_driver = {
+       .driver = {
+               .name   = KBUILD_MODNAME,
+       },
+       .probe          = chtdc_ti_pwrbtn_probe,
+       .remove         = chtdc_ti_pwrbtn_remove,
+       .id_table       = chtdc_ti_pwrbtn_id_table,
+};
+module_platform_driver(chtdc_ti_pwrbtn_driver);
+
+MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
+MODULE_LICENSE("GPL v2");