platform/x86: Add support for Basin Cove power button

This provides a new input driver for supporting the power button on
Basin Cove PMIC, found on Intel Merrifield-based devices.

The driver follows the design used in intel_chtdc_ti_pwrbtn.c module.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index a1ed131..85b92a9 100644 (file)
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -1263,6 +1263,17 @@ config INTEL_CHTDC_TI_PWRBTN
          To compile this driver as a module, choose M here: the module
          will be called intel_chtdc_ti_pwrbtn.
 
+config INTEL_MRFLD_PWRBTN
+       tristate "Intel Merrifield Basin Cove power button driver"
+       depends on INTEL_SOC_PMIC_MRFLD
+       depends on INPUT
+       ---help---
+         This option adds a power button driver for Basin Cove PMIC
+         on Intel Merrifield devices.
+
+         To compile this driver as a module, choose M here: the module
+         will be called intel_mrfld_pwrbtn.
+
 config I2C_MULTI_INSTANTIATE
        tristate "I2C multi instantiate pseudo device driver"
        depends on I2C && ACPI

diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 86cb766..87b0069 100644 (file)
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -94,6 +94,7 @@ obj-$(CONFIG_PMC_ATOM)                += pmc_atom.o
 obj-$(CONFIG_MLX_PLATFORM)     += mlx-platform.o
 obj-$(CONFIG_INTEL_TURBO_MAX_3) += intel_turbo_max_3.o
 obj-$(CONFIG_INTEL_CHTDC_TI_PWRBTN)    += intel_chtdc_ti_pwrbtn.o
+obj-$(CONFIG_INTEL_MRFLD_PWRBTN)       += intel_mrfld_pwrbtn.o
 obj-$(CONFIG_I2C_MULTI_INSTANTIATE)    += i2c-multi-instantiate.o
 obj-$(CONFIG_INTEL_ATOMISP2_PM)        += intel_atomisp2_pm.o
 obj-$(CONFIG_PCENGINES_APU2)   += pcengines-apuv2.o

diff --git a/drivers/platform/x86/intel_mrfld_pwrbtn.c b/drivers/platform/x86/intel_mrfld_pwrbtn.c
new file mode 100644 (file)
index 0000000..d58fea5
--- /dev/null
+++ b/drivers/platform/x86/intel_mrfld_pwrbtn.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Power-button driver for Basin Cove PMIC
+ *
+ * Copyright (c) 2019, Intel Corporation.
+ * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+ */
+
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/mfd/intel_soc_pmic.h>
+#include <linux/mfd/intel_soc_pmic_mrfld.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/slab.h>
+
+#define BCOVE_PBSTATUS         0x27
+#define BCOVE_PBSTATUS_PBLVL   BIT(4)  /* 1 - release, 0 - press */
+
+static irqreturn_t mrfld_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);
+       unsigned int state;
+       int ret;
+
+       ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
+       if (ret)
+               return IRQ_NONE;
+
+       dev_dbg(dev, "PBSTATUS=0x%x\n", state);
+       input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
+       input_sync(input);
+
+       regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
+       return IRQ_HANDLED;
+}
+
+static int mrfld_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, ret;
+
+       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->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, mrfld_pwrbtn_interrupt,
+                                       IRQF_ONESHOT | IRQF_SHARED, pdev->name,
+                                       input);
+       if (ret)
+               return ret;
+
+       regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
+       regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);
+
+       device_init_wakeup(dev, true);
+       dev_pm_set_wake_irq(dev, irq);
+       return 0;
+}
+
+static int mrfld_pwrbtn_remove(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+
+       dev_pm_clear_wake_irq(dev);
+       device_init_wakeup(dev, false);
+       return 0;
+}
+
+static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
+       { .name = "mrfld_bcove_pwrbtn" },
+       {}
+};
+MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
+
+static struct platform_driver mrfld_pwrbtn_driver = {
+       .driver = {
+               .name   = "mrfld_bcove_pwrbtn",
+       },
+       .probe          = mrfld_pwrbtn_probe,
+       .remove         = mrfld_pwrbtn_remove,
+       .id_table       = mrfld_pwrbtn_id_table,
+};
+module_platform_driver(mrfld_pwrbtn_driver);
+
+MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
+MODULE_LICENSE("GPL v2");