2018-06-19 18:19:14 +00:00
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// SPDX-License-Identifier: GPL-2.0+
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//
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// Driver for the IMX SNVS ON/OFF Power Key
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// Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved.
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2015-05-26 16:26:00 +00:00
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2021-10-16 04:19:33 +00:00
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#include <linux/clk.h>
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2015-05-26 16:26:00 +00:00
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/platform_device.h>
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2019-04-03 22:15:44 +00:00
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#include <linux/pm_wakeirq.h>
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2015-05-26 16:26:00 +00:00
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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2019-11-25 20:40:47 +00:00
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#define SNVS_HPVIDR1_REG 0xF8
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#define SNVS_LPSR_REG 0x4C /* LP Status Register */
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#define SNVS_LPCR_REG 0x38 /* LP Control Register */
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#define SNVS_HPSR_REG 0x14
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#define SNVS_HPSR_BTN BIT(6)
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#define SNVS_LPSR_SPO BIT(18)
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#define SNVS_LPCR_DEP_EN BIT(5)
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2015-05-26 16:26:00 +00:00
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2019-11-25 20:40:47 +00:00
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#define DEBOUNCE_TIME 30
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#define REPEAT_INTERVAL 60
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2015-05-26 16:26:00 +00:00
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struct pwrkey_drv_data {
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struct regmap *snvs;
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int irq;
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int keycode;
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int keystate; /* 1:pressed */
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int wakeup;
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struct timer_list check_timer;
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struct input_dev *input;
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2019-11-25 20:40:47 +00:00
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u8 minor_rev;
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2015-05-26 16:26:00 +00:00
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};
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2017-10-24 16:40:57 +00:00
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static void imx_imx_snvs_check_for_events(struct timer_list *t)
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2015-05-26 16:26:00 +00:00
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{
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2017-10-24 16:40:57 +00:00
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struct pwrkey_drv_data *pdata = from_timer(pdata, t, check_timer);
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2015-05-26 16:26:00 +00:00
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struct input_dev *input = pdata->input;
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u32 state;
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regmap_read(pdata->snvs, SNVS_HPSR_REG, &state);
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state = state & SNVS_HPSR_BTN ? 1 : 0;
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/* only report new event if status changed */
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if (state ^ pdata->keystate) {
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pdata->keystate = state;
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input_event(input, EV_KEY, pdata->keycode, state);
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input_sync(input);
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pm_relax(pdata->input->dev.parent);
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}
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/* repeat check if pressed long */
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if (state) {
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mod_timer(&pdata->check_timer,
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jiffies + msecs_to_jiffies(REPEAT_INTERVAL));
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}
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}
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static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev);
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2019-11-25 20:40:47 +00:00
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struct input_dev *input = pdata->input;
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2015-05-26 16:26:00 +00:00
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u32 lp_status;
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2019-11-25 20:40:47 +00:00
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pm_wakeup_event(input->dev.parent, 0);
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2015-05-26 16:26:00 +00:00
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regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status);
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2019-11-25 20:40:47 +00:00
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if (lp_status & SNVS_LPSR_SPO) {
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if (pdata->minor_rev == 0) {
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/*
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* The first generation i.MX6 SoCs only sends an
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* interrupt on button release. To mimic power-key
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* usage, we'll prepend a press event.
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*/
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input_report_key(input, pdata->keycode, 1);
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input_sync(input);
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input_report_key(input, pdata->keycode, 0);
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input_sync(input);
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pm_relax(input->dev.parent);
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} else {
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mod_timer(&pdata->check_timer,
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jiffies + msecs_to_jiffies(DEBOUNCE_TIME));
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}
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}
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2015-05-26 16:26:00 +00:00
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/* clear SPO status */
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regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
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return IRQ_HANDLED;
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}
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2021-10-16 04:19:33 +00:00
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static void imx_snvs_pwrkey_disable_clk(void *data)
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{
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clk_disable_unprepare(data);
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}
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2015-05-26 16:26:00 +00:00
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static void imx_snvs_pwrkey_act(void *pdata)
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{
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struct pwrkey_drv_data *pd = pdata;
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del_timer_sync(&pd->check_timer);
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}
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static int imx_snvs_pwrkey_probe(struct platform_device *pdev)
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{
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2019-12-05 01:56:24 +00:00
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struct pwrkey_drv_data *pdata;
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struct input_dev *input;
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2015-05-26 16:26:00 +00:00
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struct device_node *np;
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2021-10-16 04:19:33 +00:00
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struct clk *clk;
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2015-05-26 16:26:00 +00:00
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int error;
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2019-11-25 20:40:47 +00:00
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u32 vid;
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2015-05-26 16:26:00 +00:00
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/* Get SNVS register Page */
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np = pdev->dev.of_node;
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if (!np)
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return -ENODEV;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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2015-10-26 08:45:01 +00:00
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pdata->snvs = syscon_regmap_lookup_by_phandle(np, "regmap");
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2016-03-08 19:06:39 +00:00
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if (IS_ERR(pdata->snvs)) {
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2015-05-26 16:26:00 +00:00
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dev_err(&pdev->dev, "Can't get snvs syscon\n");
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2016-03-08 19:06:39 +00:00
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return PTR_ERR(pdata->snvs);
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2015-05-26 16:26:00 +00:00
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}
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if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) {
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pdata->keycode = KEY_POWER;
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dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n");
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}
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2021-10-16 04:19:33 +00:00
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clk = devm_clk_get_optional(&pdev->dev, NULL);
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if (IS_ERR(clk)) {
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dev_err(&pdev->dev, "Failed to get snvs clock (%pe)\n", clk);
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return PTR_ERR(clk);
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}
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error = clk_prepare_enable(clk);
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if (error) {
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dev_err(&pdev->dev, "Failed to enable snvs clock (%pe)\n",
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ERR_PTR(error));
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return error;
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}
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error = devm_add_action_or_reset(&pdev->dev,
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imx_snvs_pwrkey_disable_clk, clk);
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if (error) {
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dev_err(&pdev->dev,
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"Failed to register clock cleanup handler (%pe)\n",
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ERR_PTR(error));
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return error;
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}
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2015-07-15 02:36:37 +00:00
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pdata->wakeup = of_property_read_bool(np, "wakeup-source");
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2015-05-26 16:26:00 +00:00
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pdata->irq = platform_get_irq(pdev, 0);
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2019-08-14 17:46:38 +00:00
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if (pdata->irq < 0)
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2015-05-26 16:26:00 +00:00
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return -EINVAL;
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2019-11-25 20:40:47 +00:00
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regmap_read(pdata->snvs, SNVS_HPVIDR1_REG, &vid);
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pdata->minor_rev = vid & 0xff;
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2015-05-26 16:26:00 +00:00
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regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN);
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/* clear the unexpected interrupt before driver ready */
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regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO);
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2017-10-24 16:40:57 +00:00
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timer_setup(&pdata->check_timer, imx_imx_snvs_check_for_events, 0);
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2015-05-26 16:26:00 +00:00
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input = devm_input_allocate_device(&pdev->dev);
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if (!input) {
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dev_err(&pdev->dev, "failed to allocate the input device\n");
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return -ENOMEM;
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}
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input->name = pdev->name;
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input->phys = "snvs-pwrkey/input0";
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input->id.bustype = BUS_HOST;
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input_set_capability(input, EV_KEY, pdata->keycode);
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/* input customer action to cancel release timer */
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error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata);
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if (error) {
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dev_err(&pdev->dev, "failed to register remove action\n");
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return error;
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}
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2019-04-03 22:14:44 +00:00
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pdata->input = input;
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platform_set_drvdata(pdev, pdata);
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2015-05-26 16:26:00 +00:00
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error = devm_request_irq(&pdev->dev, pdata->irq,
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imx_snvs_pwrkey_interrupt,
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0, pdev->name, pdev);
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if (error) {
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dev_err(&pdev->dev, "interrupt not available.\n");
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return error;
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}
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error = input_register_device(input);
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if (error < 0) {
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dev_err(&pdev->dev, "failed to register input device\n");
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return error;
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}
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device_init_wakeup(&pdev->dev, pdata->wakeup);
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2019-04-03 22:15:44 +00:00
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error = dev_pm_set_wake_irq(&pdev->dev, pdata->irq);
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if (error)
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dev_err(&pdev->dev, "irq wake enable failed.\n");
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2015-05-26 16:26:00 +00:00
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return 0;
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}
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static const struct of_device_id imx_snvs_pwrkey_ids[] = {
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{ .compatible = "fsl,sec-v4.0-pwrkey" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids);
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static struct platform_driver imx_snvs_pwrkey_driver = {
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.driver = {
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.name = "snvs_pwrkey",
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.of_match_table = imx_snvs_pwrkey_ids,
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},
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.probe = imx_snvs_pwrkey_probe,
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};
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module_platform_driver(imx_snvs_pwrkey_driver);
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MODULE_AUTHOR("Freescale Semiconductor");
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MODULE_DESCRIPTION("i.MX snvs power key Driver");
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MODULE_LICENSE("GPL");
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