277 lines
7.1 KiB
C
277 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OnKey device driver for DA9063, DA9062 and DA9061 PMICs
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* Copyright (C) 2015 Dialog Semiconductor Ltd.
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*/
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#include <linux/devm-helpers.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/workqueue.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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#include <linux/mfd/da9063/core.h>
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#include <linux/mfd/da9063/registers.h>
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#include <linux/mfd/da9062/core.h>
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#include <linux/mfd/da9062/registers.h>
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struct da906x_chip_config {
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/* REGS */
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int onkey_status;
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int onkey_pwr_signalling;
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int onkey_fault_log;
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int onkey_shutdown;
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/* MASKS */
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int onkey_nonkey_mask;
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int onkey_nonkey_lock_mask;
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int onkey_key_reset_mask;
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int onkey_shutdown_mask;
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/* NAMES */
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const char *name;
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};
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struct da9063_onkey {
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struct delayed_work work;
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struct input_dev *input;
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struct device *dev;
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struct regmap *regmap;
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const struct da906x_chip_config *config;
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char phys[32];
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bool key_power;
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};
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static const struct da906x_chip_config da9063_regs = {
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/* REGS */
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.onkey_status = DA9063_REG_STATUS_A,
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.onkey_pwr_signalling = DA9063_REG_CONTROL_B,
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.onkey_fault_log = DA9063_REG_FAULT_LOG,
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.onkey_shutdown = DA9063_REG_CONTROL_F,
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/* MASKS */
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.onkey_nonkey_mask = DA9063_NONKEY,
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.onkey_nonkey_lock_mask = DA9063_NONKEY_LOCK,
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.onkey_key_reset_mask = DA9063_KEY_RESET,
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.onkey_shutdown_mask = DA9063_SHUTDOWN,
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/* NAMES */
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.name = DA9063_DRVNAME_ONKEY,
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};
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static const struct da906x_chip_config da9062_regs = {
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/* REGS */
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.onkey_status = DA9062AA_STATUS_A,
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.onkey_pwr_signalling = DA9062AA_CONTROL_B,
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.onkey_fault_log = DA9062AA_FAULT_LOG,
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.onkey_shutdown = DA9062AA_CONTROL_F,
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/* MASKS */
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.onkey_nonkey_mask = DA9062AA_NONKEY_MASK,
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.onkey_nonkey_lock_mask = DA9062AA_NONKEY_LOCK_MASK,
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.onkey_key_reset_mask = DA9062AA_KEY_RESET_MASK,
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.onkey_shutdown_mask = DA9062AA_SHUTDOWN_MASK,
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/* NAMES */
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.name = "da9062-onkey",
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};
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static const struct of_device_id da9063_compatible_reg_id_table[] = {
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{ .compatible = "dlg,da9063-onkey", .data = &da9063_regs },
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{ .compatible = "dlg,da9062-onkey", .data = &da9062_regs },
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{ },
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};
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MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
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static void da9063_poll_on(struct work_struct *work)
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{
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struct da9063_onkey *onkey = container_of(work,
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struct da9063_onkey,
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work.work);
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const struct da906x_chip_config *config = onkey->config;
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unsigned int val;
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int fault_log = 0;
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bool poll = true;
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int error;
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/* Poll to see when the pin is released */
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error = regmap_read(onkey->regmap,
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config->onkey_status,
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&val);
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if (error) {
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dev_err(onkey->dev,
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"Failed to read ON status: %d\n", error);
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goto err_poll;
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}
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if (!(val & config->onkey_nonkey_mask)) {
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error = regmap_update_bits(onkey->regmap,
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config->onkey_pwr_signalling,
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config->onkey_nonkey_lock_mask,
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0);
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if (error) {
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dev_err(onkey->dev,
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"Failed to reset the Key Delay %d\n", error);
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goto err_poll;
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}
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input_report_key(onkey->input, KEY_POWER, 0);
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input_sync(onkey->input);
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poll = false;
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}
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/*
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* If the fault log KEY_RESET is detected, then clear it
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* and shut down the system.
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*/
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error = regmap_read(onkey->regmap,
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config->onkey_fault_log,
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&fault_log);
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if (error) {
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dev_warn(&onkey->input->dev,
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"Cannot read FAULT_LOG: %d\n", error);
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} else if (fault_log & config->onkey_key_reset_mask) {
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error = regmap_write(onkey->regmap,
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config->onkey_fault_log,
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config->onkey_key_reset_mask);
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if (error) {
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dev_warn(&onkey->input->dev,
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"Cannot reset KEY_RESET fault log: %d\n",
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error);
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} else {
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/* at this point we do any S/W housekeeping
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* and then send shutdown command
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*/
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dev_dbg(&onkey->input->dev,
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"Sending SHUTDOWN to PMIC ...\n");
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error = regmap_write(onkey->regmap,
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config->onkey_shutdown,
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config->onkey_shutdown_mask);
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if (error)
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dev_err(&onkey->input->dev,
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"Cannot SHUTDOWN PMIC: %d\n",
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error);
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}
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}
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err_poll:
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if (poll)
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schedule_delayed_work(&onkey->work, msecs_to_jiffies(50));
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}
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static irqreturn_t da9063_onkey_irq_handler(int irq, void *data)
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{
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struct da9063_onkey *onkey = data;
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const struct da906x_chip_config *config = onkey->config;
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unsigned int val;
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int error;
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error = regmap_read(onkey->regmap,
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config->onkey_status,
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&val);
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if (onkey->key_power && !error && (val & config->onkey_nonkey_mask)) {
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input_report_key(onkey->input, KEY_POWER, 1);
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input_sync(onkey->input);
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schedule_delayed_work(&onkey->work, 0);
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dev_dbg(onkey->dev, "KEY_POWER long press.\n");
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} else {
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input_report_key(onkey->input, KEY_POWER, 1);
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input_sync(onkey->input);
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input_report_key(onkey->input, KEY_POWER, 0);
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input_sync(onkey->input);
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dev_dbg(onkey->dev, "KEY_POWER short press.\n");
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}
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return IRQ_HANDLED;
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}
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static int da9063_onkey_probe(struct platform_device *pdev)
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{
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struct da9063_onkey *onkey;
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const struct of_device_id *match;
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int irq;
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int error;
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match = of_match_node(da9063_compatible_reg_id_table,
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pdev->dev.of_node);
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if (!match)
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return -ENXIO;
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onkey = devm_kzalloc(&pdev->dev, sizeof(struct da9063_onkey),
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GFP_KERNEL);
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if (!onkey) {
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dev_err(&pdev->dev, "Failed to allocate memory.\n");
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return -ENOMEM;
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}
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onkey->config = match->data;
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onkey->dev = &pdev->dev;
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onkey->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!onkey->regmap) {
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dev_err(&pdev->dev, "Parent regmap unavailable.\n");
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return -ENXIO;
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}
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onkey->key_power = !of_property_read_bool(pdev->dev.of_node,
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"dlg,disable-key-power");
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onkey->input = devm_input_allocate_device(&pdev->dev);
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if (!onkey->input) {
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dev_err(&pdev->dev, "Failed to allocated input device.\n");
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return -ENOMEM;
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}
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onkey->input->name = onkey->config->name;
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snprintf(onkey->phys, sizeof(onkey->phys), "%s/input0",
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onkey->config->name);
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onkey->input->phys = onkey->phys;
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onkey->input->dev.parent = &pdev->dev;
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input_set_capability(onkey->input, EV_KEY, KEY_POWER);
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error = devm_delayed_work_autocancel(&pdev->dev, &onkey->work,
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da9063_poll_on);
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if (error) {
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dev_err(&pdev->dev,
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"Failed to add cancel poll action: %d\n",
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error);
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return error;
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}
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irq = platform_get_irq_byname(pdev, "ONKEY");
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if (irq < 0)
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return irq;
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error = devm_request_threaded_irq(&pdev->dev, irq,
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NULL, da9063_onkey_irq_handler,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"ONKEY", onkey);
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if (error) {
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dev_err(&pdev->dev,
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"Failed to request IRQ %d: %d\n", irq, error);
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return error;
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}
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error = input_register_device(onkey->input);
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if (error) {
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dev_err(&pdev->dev,
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"Failed to register input device: %d\n", error);
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return error;
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}
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return 0;
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}
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static struct platform_driver da9063_onkey_driver = {
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.probe = da9063_onkey_probe,
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.driver = {
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.name = DA9063_DRVNAME_ONKEY,
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.of_match_table = da9063_compatible_reg_id_table,
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},
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};
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module_platform_driver(da9063_onkey_driver);
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MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
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MODULE_DESCRIPTION("Onkey device driver for Dialog DA9063, DA9062 and DA9061");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:" DA9063_DRVNAME_ONKEY);
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