336 строки
8.6 KiB
C
336 строки
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Azoteq IQS620A/621/622/624/625 Keys and Switches
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*
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* Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
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*/
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#include <linux/device.h>
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#include <linux/input.h>
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#include <linux/kernel.h>
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#include <linux/mfd/iqs62x.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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enum {
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IQS62X_SW_HALL_N,
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IQS62X_SW_HALL_S,
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};
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static const char * const iqs62x_switch_names[] = {
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[IQS62X_SW_HALL_N] = "hall-switch-north",
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[IQS62X_SW_HALL_S] = "hall-switch-south",
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};
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struct iqs62x_switch_desc {
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enum iqs62x_event_flag flag;
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unsigned int code;
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bool enabled;
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};
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struct iqs62x_keys_private {
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struct iqs62x_core *iqs62x;
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struct input_dev *input;
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struct notifier_block notifier;
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struct iqs62x_switch_desc switches[ARRAY_SIZE(iqs62x_switch_names)];
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unsigned int keycode[IQS62X_NUM_KEYS];
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unsigned int keycodemax;
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u8 interval;
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};
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static int iqs62x_keys_parse_prop(struct platform_device *pdev,
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struct iqs62x_keys_private *iqs62x_keys)
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{
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struct fwnode_handle *child;
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unsigned int val;
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int ret, i;
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ret = device_property_count_u32(&pdev->dev, "linux,keycodes");
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if (ret > IQS62X_NUM_KEYS) {
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dev_err(&pdev->dev, "Too many keycodes present\n");
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return -EINVAL;
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} else if (ret < 0) {
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dev_err(&pdev->dev, "Failed to count keycodes: %d\n", ret);
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return ret;
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}
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iqs62x_keys->keycodemax = ret;
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ret = device_property_read_u32_array(&pdev->dev, "linux,keycodes",
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iqs62x_keys->keycode,
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iqs62x_keys->keycodemax);
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if (ret) {
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dev_err(&pdev->dev, "Failed to read keycodes: %d\n", ret);
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return ret;
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}
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for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++) {
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child = device_get_named_child_node(&pdev->dev,
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iqs62x_switch_names[i]);
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if (!child)
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continue;
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ret = fwnode_property_read_u32(child, "linux,code", &val);
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if (ret) {
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dev_err(&pdev->dev, "Failed to read switch code: %d\n",
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ret);
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return ret;
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}
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iqs62x_keys->switches[i].code = val;
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iqs62x_keys->switches[i].enabled = true;
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if (fwnode_property_present(child, "azoteq,use-prox"))
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iqs62x_keys->switches[i].flag = (i == IQS62X_SW_HALL_N ?
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IQS62X_EVENT_HALL_N_P :
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IQS62X_EVENT_HALL_S_P);
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else
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iqs62x_keys->switches[i].flag = (i == IQS62X_SW_HALL_N ?
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IQS62X_EVENT_HALL_N_T :
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IQS62X_EVENT_HALL_S_T);
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}
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return 0;
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}
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static int iqs62x_keys_init(struct iqs62x_keys_private *iqs62x_keys)
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{
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struct iqs62x_core *iqs62x = iqs62x_keys->iqs62x;
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enum iqs62x_event_flag flag;
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unsigned int event_reg, val;
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unsigned int event_mask = 0;
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int ret, i;
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switch (iqs62x->dev_desc->prod_num) {
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case IQS620_PROD_NUM:
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case IQS621_PROD_NUM:
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case IQS622_PROD_NUM:
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event_reg = IQS620_GLBL_EVENT_MASK;
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/*
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* Discreet button, hysteresis and SAR UI flags represent keys
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* and are unmasked if mapped to a valid keycode.
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*/
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for (i = 0; i < iqs62x_keys->keycodemax; i++) {
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if (iqs62x_keys->keycode[i] == KEY_RESERVED)
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continue;
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if (iqs62x_events[i].reg == IQS62X_EVENT_PROX)
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event_mask |= iqs62x->dev_desc->prox_mask;
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else if (iqs62x_events[i].reg == IQS62X_EVENT_HYST)
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event_mask |= (iqs62x->dev_desc->hyst_mask |
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iqs62x->dev_desc->sar_mask);
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}
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ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->hall_flags,
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&val);
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if (ret)
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return ret;
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/*
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* Hall UI flags represent switches and are unmasked if their
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* corresponding child nodes are present.
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*/
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for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++) {
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if (!(iqs62x_keys->switches[i].enabled))
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continue;
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flag = iqs62x_keys->switches[i].flag;
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if (iqs62x_events[flag].reg != IQS62X_EVENT_HALL)
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continue;
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event_mask |= iqs62x->dev_desc->hall_mask;
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input_report_switch(iqs62x_keys->input,
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iqs62x_keys->switches[i].code,
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(val & iqs62x_events[flag].mask) ==
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iqs62x_events[flag].val);
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}
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input_sync(iqs62x_keys->input);
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break;
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case IQS624_PROD_NUM:
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event_reg = IQS624_HALL_UI;
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/*
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* Interval change events represent keys and are unmasked if
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* either wheel movement flag is mapped to a valid keycode.
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*/
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if (iqs62x_keys->keycode[IQS62X_EVENT_WHEEL_UP] != KEY_RESERVED)
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event_mask |= IQS624_HALL_UI_INT_EVENT;
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if (iqs62x_keys->keycode[IQS62X_EVENT_WHEEL_DN] != KEY_RESERVED)
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event_mask |= IQS624_HALL_UI_INT_EVENT;
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ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->interval,
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&val);
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if (ret)
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return ret;
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iqs62x_keys->interval = val;
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break;
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default:
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return 0;
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}
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return regmap_update_bits(iqs62x->regmap, event_reg, event_mask, 0);
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}
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static int iqs62x_keys_notifier(struct notifier_block *notifier,
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unsigned long event_flags, void *context)
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{
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struct iqs62x_event_data *event_data = context;
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struct iqs62x_keys_private *iqs62x_keys;
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int ret, i;
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iqs62x_keys = container_of(notifier, struct iqs62x_keys_private,
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notifier);
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if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
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ret = iqs62x_keys_init(iqs62x_keys);
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if (ret) {
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dev_err(iqs62x_keys->input->dev.parent,
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"Failed to re-initialize device: %d\n", ret);
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return NOTIFY_BAD;
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}
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return NOTIFY_OK;
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}
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for (i = 0; i < iqs62x_keys->keycodemax; i++) {
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if (iqs62x_events[i].reg == IQS62X_EVENT_WHEEL &&
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event_data->interval == iqs62x_keys->interval)
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continue;
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input_report_key(iqs62x_keys->input, iqs62x_keys->keycode[i],
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event_flags & BIT(i));
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}
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for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++)
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if (iqs62x_keys->switches[i].enabled)
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input_report_switch(iqs62x_keys->input,
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iqs62x_keys->switches[i].code,
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event_flags &
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BIT(iqs62x_keys->switches[i].flag));
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input_sync(iqs62x_keys->input);
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if (event_data->interval == iqs62x_keys->interval)
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return NOTIFY_OK;
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/*
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* Each frame contains at most one wheel event (up or down), in which
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* case a complementary release cycle is emulated.
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*/
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if (event_flags & BIT(IQS62X_EVENT_WHEEL_UP)) {
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input_report_key(iqs62x_keys->input,
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iqs62x_keys->keycode[IQS62X_EVENT_WHEEL_UP],
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0);
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input_sync(iqs62x_keys->input);
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} else if (event_flags & BIT(IQS62X_EVENT_WHEEL_DN)) {
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input_report_key(iqs62x_keys->input,
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iqs62x_keys->keycode[IQS62X_EVENT_WHEEL_DN],
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0);
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input_sync(iqs62x_keys->input);
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}
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iqs62x_keys->interval = event_data->interval;
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return NOTIFY_OK;
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}
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static int iqs62x_keys_probe(struct platform_device *pdev)
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{
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struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
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struct iqs62x_keys_private *iqs62x_keys;
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struct input_dev *input;
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int ret, i;
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iqs62x_keys = devm_kzalloc(&pdev->dev, sizeof(*iqs62x_keys),
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GFP_KERNEL);
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if (!iqs62x_keys)
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return -ENOMEM;
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platform_set_drvdata(pdev, iqs62x_keys);
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ret = iqs62x_keys_parse_prop(pdev, iqs62x_keys);
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if (ret)
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return ret;
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input = devm_input_allocate_device(&pdev->dev);
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if (!input)
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return -ENOMEM;
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input->keycodemax = iqs62x_keys->keycodemax;
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input->keycode = iqs62x_keys->keycode;
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input->keycodesize = sizeof(*iqs62x_keys->keycode);
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input->name = iqs62x->dev_desc->dev_name;
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input->id.bustype = BUS_I2C;
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for (i = 0; i < iqs62x_keys->keycodemax; i++)
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if (iqs62x_keys->keycode[i] != KEY_RESERVED)
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input_set_capability(input, EV_KEY,
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iqs62x_keys->keycode[i]);
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for (i = 0; i < ARRAY_SIZE(iqs62x_keys->switches); i++)
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if (iqs62x_keys->switches[i].enabled)
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input_set_capability(input, EV_SW,
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iqs62x_keys->switches[i].code);
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iqs62x_keys->iqs62x = iqs62x;
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iqs62x_keys->input = input;
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ret = iqs62x_keys_init(iqs62x_keys);
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if (ret) {
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dev_err(&pdev->dev, "Failed to initialize device: %d\n", ret);
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return ret;
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}
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ret = input_register_device(iqs62x_keys->input);
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if (ret) {
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dev_err(&pdev->dev, "Failed to register device: %d\n", ret);
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return ret;
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}
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iqs62x_keys->notifier.notifier_call = iqs62x_keys_notifier;
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ret = blocking_notifier_chain_register(&iqs62x_keys->iqs62x->nh,
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&iqs62x_keys->notifier);
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if (ret)
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dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret);
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return ret;
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}
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static int iqs62x_keys_remove(struct platform_device *pdev)
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{
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struct iqs62x_keys_private *iqs62x_keys = platform_get_drvdata(pdev);
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int ret;
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ret = blocking_notifier_chain_unregister(&iqs62x_keys->iqs62x->nh,
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&iqs62x_keys->notifier);
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if (ret)
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dev_err(&pdev->dev, "Failed to unregister notifier: %d\n", ret);
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return ret;
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}
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static struct platform_driver iqs62x_keys_platform_driver = {
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.driver = {
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.name = "iqs62x-keys",
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},
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.probe = iqs62x_keys_probe,
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.remove = iqs62x_keys_remove,
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};
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module_platform_driver(iqs62x_keys_platform_driver);
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MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
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MODULE_DESCRIPTION("Azoteq IQS620A/621/622/624/625 Keys and Switches");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:iqs62x-keys");
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