[PATCH 1/2] input: Add Qualcomm PM8941 power key driver

Bjorn Andersson
2014-10-07T01:11:52Z

From: Courtney Cavin <courtney.cavin@sonymobile.com>

Signed-off-by: Courtney Cavin <courtney.cavin@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
---
drivers/input/misc/Kconfig | 12 +++
drivers/input/misc/Makefile | 1 +
drivers/input/misc/pm8941-pwrkey.c | 196 ++++++++++++++++++++++++++++++++++++
3 files changed, 209 insertions(+)
create mode 100644 drivers/input/misc/pm8941-pwrkey.c

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 2ff4425..abe615c 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -105,6 +105,18 @@ config INPUT_PCSPKR
To compile this driver as a module, choose M here: the
module will be called pcspkr.

+config INPUT_PM8941_PWRKEY
+ tristate "Qualcomm PM8X41 power key support"
+ depends on MFD_SPMI_PMIC
+ help
+ Say Y here if you want support for the power key usually found
+ on boards using a Qualcomm PM8941 compatible PMIC.
+
+ If unsure, say Y.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pm8941-pwrkey.
+
config INPUT_PM8XXX_VIBRATOR
tristate "Qualcomm PM8XXX vibrator support"
depends on MFD_PM8XXX
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 4955ad3..e4ab02c 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o
obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o
obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o
obj-$(CONFIG_INPUT_PCSPKR) += pcspkr.o
+obj-$(CONFIG_INPUT_PM8941_PWRKEY) += pm8941-pwrkey.o
obj-$(CONFIG_INPUT_PM8XXX_VIBRATOR) += pm8xxx-vibrator.o
obj-$(CONFIG_INPUT_PMIC8XXX_PWRKEY) += pmic8xxx-pwrkey.o
obj-$(CONFIG_INPUT_POWERMATE) += powermate.o
diff --git a/drivers/input/misc/pm8941-pwrkey.c b/drivers/input/misc/pm8941-pwrkey.c
new file mode 100644
index 0000000..58df8bc
--- /dev/null
+++ b/drivers/input/misc/pm8941-pwrkey.c
@@ -0,0 +1,196 @@
+/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
+ * Copyright (c) 2014, Sony Mobile Communications Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/log2.h>
+#include <linux/of.h>
+
+#define PON_RT_STS 0x10
+#define PON_PULL_CTL 0x70
+#define PON_DBC_CTL 0x71
+
+#define PON_DBC_DELAY_MASK 0x7
+#define PON_KPDPWR_N_SET BIT(0)
+#define PON_KPDPWR_PULL_UP BIT(1)
+
+struct pm8941_pwrkey {
+ int irq;
+ u32 baseaddr;
+ struct regmap *regmap;
+ struct input_dev *input;
+};
+
+static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data)
+{
+ struct pm8941_pwrkey *pwrkey = _data;
+ unsigned int sts;
+ int rc;
+
+ rc = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_RT_STS, &sts);
+ if (rc)
+ return IRQ_HANDLED;
+
+ input_report_key(pwrkey->input, KEY_POWER, !!(sts & PON_KPDPWR_N_SET));
+ input_sync(pwrkey->input);
+
+ return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pm8941_pwrkey_suspend(struct device *dev)
+{
+ struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(pwrkey->irq);
+
+ return 0;
+}
+
+static int pm8941_pwrkey_resume(struct device *dev)
+{
+ struct pm8941_pwrkey *pwrkey = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(pwrkey->irq);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pm8941_pwr_key_pm_ops,
+ pm8941_pwrkey_suspend, pm8941_pwrkey_resume);
+
+static int pm8941_pwrkey_probe(struct platform_device *pdev)
+{
+ struct pm8941_pwrkey *pwrkey;
+ bool pull_up;
+ u32 req_delay;
+ int rc;
+
+ if (of_property_read_u32(pdev->dev.of_node, "debounce", &req_delay))
+ req_delay = 15625;
+
+ if (req_delay > 2000000 || req_delay == 0) {
+ dev_err(&pdev->dev, "invalid debounce time: %u\n", req_delay);
+ return -EINVAL;
+ }
+
+ pull_up = of_property_read_bool(pdev->dev.of_node, "bias-pull-up");
+
+ pwrkey = devm_kzalloc(&pdev->dev, sizeof(*pwrkey), GFP_KERNEL);
+ if (!pwrkey)
+ return -ENOMEM;
+
+ pwrkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!pwrkey->regmap) {
+ dev_err(&pdev->dev, "failed to locate regmap\n");
+ return -ENODEV;
+ }
+
+ pwrkey->irq = platform_get_irq(pdev, 0);
+ if (pwrkey->irq < 0) {
+ dev_err(&pdev->dev, "failed to get irq\n");
+ return pwrkey->irq;
+ }
+
+ rc = of_property_read_u32(pdev->dev.of_node, "reg", &pwrkey->baseaddr);
+ if (rc)
+ return rc;
+
+ pwrkey->input = devm_input_allocate_device(&pdev->dev);
+ if (!pwrkey->input) {
+ dev_dbg(&pdev->dev, "unable to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ input_set_capability(pwrkey->input, EV_KEY, KEY_POWER);
+
+ pwrkey->input->name = "pm8941_pwrkey";
+ pwrkey->input->phys = "pm8941_pwrkey/input0";
+
+ req_delay = (req_delay << 6) / USEC_PER_SEC;
+ req_delay = ilog2(req_delay);
+
+ rc = regmap_update_bits(pwrkey->regmap, pwrkey->baseaddr + PON_DBC_CTL,
+ PON_DBC_DELAY_MASK, req_delay);
+ if (rc) {
+ dev_err(&pdev->dev, "failed to set debounce: %d\n", rc);
+ return rc;
+ }
+
+ rc = regmap_update_bits(pwrkey->regmap,
+ pwrkey->baseaddr + PON_PULL_CTL, PON_KPDPWR_PULL_UP,
+ pull_up ? PON_KPDPWR_PULL_UP : 0);
+ if (rc) {
+ dev_err(&pdev->dev, "failed to set pull: %d\n", rc);
+ return rc;
+ }
+
+ rc = devm_request_threaded_irq(&pdev->dev, pwrkey->irq,
+ NULL, pm8941_pwrkey_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ "pm8941_pwrkey", pwrkey);
+ if (rc) {
+ dev_err(&pdev->dev, "failed requesting IRQ: %d\n", rc);
+ return rc;
+ }
+
+ rc = input_register_device(pwrkey->input);
+ if (rc) {
+ dev_err(&pdev->dev, "failed to register input device: %d\n",
+ rc);
+ return rc;
+ }
+
+ platform_set_drvdata(pdev, pwrkey);
+ device_init_wakeup(&pdev->dev, 1);
+
+ return 0;
+}
+
+static int pm8941_pwrkey_remove(struct platform_device *pdev)
+{
+ device_init_wakeup(&pdev->dev, 0);
+
+ return 0;
+}
+
+static const struct of_device_id pm8941_pwr_key_id_table[] = {
+ { .compatible = "qcom,pm8941-pwrkey" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pm8941_pwr_key_id_table);
+
+static struct platform_driver pm8941_pwrkey_driver = {
+ .probe = pm8941_pwrkey_probe,
+ .remove = pm8941_pwrkey_remove,
+ .driver = {
+ .name = "pm8941-pwrkey",
+ .owner = THIS_MODULE,
+ .pm = &pm8941_pwr_key_pm_ops,
+ .of_match_table = of_match_ptr(pm8941_pwr_key_id_table),
+ },
+};
+module_platform_driver(pm8941_pwrkey_driver);
+
+MODULE_DESCRIPTION("PM8941 Power Key driver");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5