Input: add Qualcomm PM8941 power key driver
authorCourtney Cavin <courtney.cavin@sonymobile.com>
Sat, 21 Mar 2015 04:45:59 +0000 (21:45 -0700)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>
Sat, 21 Mar 2015 04:59:55 +0000 (21:59 -0700)
Signed-off-by: Courtney Cavin <courtney.cavin@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Tested-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt [new file with mode: 0644]
drivers/input/misc/Kconfig
drivers/input/misc/Makefile
drivers/input/misc/pm8941-pwrkey.c [new file with mode: 0644]

diff --git a/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt b/Documentation/devicetree/bindings/input/qcom,pm8941-pwrkey.txt
new file mode 100644 (file)
index 0000000..07bf55f
--- /dev/null
@@ -0,0 +1,43 @@
+Qualcomm PM8941 PMIC Power Key
+
+PROPERTIES
+
+- compatible:
+       Usage: required
+       Value type: <string>
+       Definition: must be one of:
+                   "qcom,pm8941-pwrkey"
+
+- reg:
+       Usage: required
+       Value type: <prop-encoded-array>
+       Definition: base address of registers for block
+
+- interrupts:
+       Usage: required
+       Value type: <prop-encoded-array>
+       Definition: key change interrupt; The format of the specifier is
+                   defined by the binding document describing the node's
+                   interrupt parent.
+
+- debounce:
+       Usage: optional
+       Value type: <u32>
+       Definition: time in microseconds that key must be pressed or released
+                   for state change interrupt to trigger.
+
+- bias-pull-up:
+       Usage: optional
+       Value type: <empty>
+       Definition: presence of this property indicates that the KPDPWR_N pin
+                   should be configured for pull up.
+
+EXAMPLE
+
+       pwrkey@800 {
+               compatible = "qcom,pm8941-pwrkey";
+               reg = <0x800>;
+               interrupts = <0x0 0x8 0 IRQ_TYPE_EDGE_BOTH>;
+               debounce = <15625>;
+               bias-pull-up;
+       };
index ef542f7ad944b0aee985d66667d21d7d7f339936..4436ab1b9735d608821309eea92b486a1bc147e2 100644 (file)
@@ -115,6 +115,18 @@ 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 PM8941 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
index 75b58841d5a76f01ababe4532c384dde125304fb..78ba4c1b8532c5093c4259f69761cf7a0b751d3b 100644 (file)
@@ -50,6 +50,7 @@ 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 (file)
index 0000000..867db8a
--- /dev/null
@@ -0,0 +1,293 @@
+/*
+ * 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/delay.h>
+#include <linux/errno.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/log2.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+#define PON_REV2                       0x01
+
+#define PON_RT_STS                     0x10
+#define  PON_KPDPWR_N_SET              BIT(0)
+
+#define PON_PS_HOLD_RST_CTL            0x5a
+#define PON_PS_HOLD_RST_CTL2           0x5b
+#define  PON_PS_HOLD_ENABLE            BIT(7)
+#define  PON_PS_HOLD_TYPE_MASK         0x0f
+#define  PON_PS_HOLD_TYPE_SHUTDOWN     4
+#define  PON_PS_HOLD_TYPE_HARD_RESET   7
+
+#define PON_PULL_CTL                   0x70
+#define  PON_KPDPWR_PULL_UP            BIT(1)
+
+#define PON_DBC_CTL                    0x71
+#define  PON_DBC_DELAY_MASK            0x7
+
+
+struct pm8941_pwrkey {
+       struct device *dev;
+       int irq;
+       u32 baseaddr;
+       struct regmap *regmap;
+       struct input_dev *input;
+
+       unsigned int revision;
+       struct notifier_block reboot_notifier;
+};
+
+static int pm8941_reboot_notify(struct notifier_block *nb,
+                               unsigned long code, void *unused)
+{
+       struct pm8941_pwrkey *pwrkey = container_of(nb, struct pm8941_pwrkey,
+                                                   reboot_notifier);
+       unsigned int enable_reg;
+       unsigned int reset_type;
+       int error;
+
+       /* PMICs with revision 0 have the enable bit in same register as ctrl */
+       if (pwrkey->revision == 0)
+               enable_reg = PON_PS_HOLD_RST_CTL;
+       else
+               enable_reg = PON_PS_HOLD_RST_CTL2;
+
+       error = regmap_update_bits(pwrkey->regmap,
+                                  pwrkey->baseaddr + enable_reg,
+                                  PON_PS_HOLD_ENABLE,
+                                  0);
+       if (error)
+               dev_err(pwrkey->dev,
+                       "unable to clear ps hold reset enable: %d\n",
+                       error);
+
+       /*
+        * Updates of PON_PS_HOLD_ENABLE requires 3 sleep cycles between
+        * writes.
+        */
+       usleep_range(100, 1000);
+
+       switch (code) {
+       case SYS_HALT:
+       case SYS_POWER_OFF:
+               reset_type = PON_PS_HOLD_TYPE_SHUTDOWN;
+               break;
+       case SYS_RESTART:
+       default:
+               reset_type = PON_PS_HOLD_TYPE_HARD_RESET;
+               break;
+       };
+
+       error = regmap_update_bits(pwrkey->regmap,
+                                  pwrkey->baseaddr + PON_PS_HOLD_RST_CTL,
+                                  PON_PS_HOLD_TYPE_MASK,
+                                  reset_type);
+       if (error)
+               dev_err(pwrkey->dev, "unable to set ps hold reset type: %d\n",
+                       error);
+
+       error = regmap_update_bits(pwrkey->regmap,
+                                  pwrkey->baseaddr + enable_reg,
+                                  PON_PS_HOLD_ENABLE,
+                                  PON_PS_HOLD_ENABLE);
+       if (error)
+               dev_err(pwrkey->dev, "unable to re-set enable: %d\n", error);
+
+       return NOTIFY_DONE;
+}
+
+static irqreturn_t pm8941_pwrkey_irq(int irq, void *_data)
+{
+       struct pm8941_pwrkey *pwrkey = _data;
+       unsigned int sts;
+       int error;
+
+       error = regmap_read(pwrkey->regmap,
+                           pwrkey->baseaddr + PON_RT_STS, &sts);
+       if (error)
+               return IRQ_HANDLED;
+
+       input_report_key(pwrkey->input, KEY_POWER, !!(sts & PON_KPDPWR_N_SET));
+       input_sync(pwrkey->input);
+
+       return IRQ_HANDLED;
+}
+
+static int __maybe_unused 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 __maybe_unused 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;
+}
+
+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 error;
+
+       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->dev = &pdev->dev;
+
+       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;
+       }
+
+       error = of_property_read_u32(pdev->dev.of_node, "reg",
+                                    &pwrkey->baseaddr);
+       if (error)
+               return error;
+
+       error = regmap_read(pwrkey->regmap, pwrkey->baseaddr + PON_REV2,
+                           &pwrkey->revision);
+       if (error) {
+               dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
+               return error;
+       }
+
+       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);
+
+       error = regmap_update_bits(pwrkey->regmap,
+                                  pwrkey->baseaddr + PON_DBC_CTL,
+                                  PON_DBC_DELAY_MASK,
+                                  req_delay);
+       if (error) {
+               dev_err(&pdev->dev, "failed to set debounce: %d\n", error);
+               return error;
+       }
+
+       error = regmap_update_bits(pwrkey->regmap,
+                                  pwrkey->baseaddr + PON_PULL_CTL,
+                                  PON_KPDPWR_PULL_UP,
+                                  pull_up ? PON_KPDPWR_PULL_UP : 0);
+       if (error) {
+               dev_err(&pdev->dev, "failed to set pull: %d\n", error);
+               return error;
+       }
+
+       error = devm_request_threaded_irq(&pdev->dev, pwrkey->irq,
+                                         NULL, pm8941_pwrkey_irq,
+                                         IRQF_ONESHOT,
+                                         "pm8941_pwrkey", pwrkey);
+       if (error) {
+               dev_err(&pdev->dev, "failed requesting IRQ: %d\n", error);
+               return error;
+       }
+
+       error = input_register_device(pwrkey->input);
+       if (error) {
+               dev_err(&pdev->dev, "failed to register input device: %d\n",
+                       error);
+               return error;
+       }
+
+       pwrkey->reboot_notifier.notifier_call = pm8941_reboot_notify,
+       error = register_reboot_notifier(&pwrkey->reboot_notifier);
+       if (error) {
+               dev_err(&pdev->dev, "failed to register reboot notifier: %d\n",
+                       error);
+               return error;
+       }
+
+       platform_set_drvdata(pdev, pwrkey);
+       device_init_wakeup(&pdev->dev, 1);
+
+       return 0;
+}
+
+static int pm8941_pwrkey_remove(struct platform_device *pdev)
+{
+       struct pm8941_pwrkey *pwrkey = platform_get_drvdata(pdev);
+
+       device_init_wakeup(&pdev->dev, 0);
+       unregister_reboot_notifier(&pwrkey->reboot_notifier);
+
+       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",
+               .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");