diff options
Diffstat (limited to 'drivers/input/misc/nxp-bbnsm-pwrkey.c')
| -rw-r--r-- | drivers/input/misc/nxp-bbnsm-pwrkey.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/drivers/input/misc/nxp-bbnsm-pwrkey.c b/drivers/input/misc/nxp-bbnsm-pwrkey.c new file mode 100644 index 0000000000..1d99206dd3 --- /dev/null +++ b/drivers/input/misc/nxp-bbnsm-pwrkey.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// Copyright 2022 NXP. + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/input.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/jiffies.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/pm_wakeirq.h> +#include <linux/regmap.h> + +#define BBNSM_CTRL 0x8 +#define BBNSM_INT_EN 0x10 +#define BBNSM_EVENTS 0x14 +#define BBNSM_PAD_CTRL 0x24 + +#define BBNSM_BTN_PRESSED BIT(7) +#define BBNSM_PWR_ON BIT(6) +#define BBNSM_BTN_OFF BIT(5) +#define BBNSM_EMG_OFF BIT(4) +#define BBNSM_PWRKEY_EVENTS (BBNSM_PWR_ON | BBNSM_BTN_OFF | BBNSM_EMG_OFF) +#define BBNSM_DP_EN BIT(24) + +#define DEBOUNCE_TIME 30 +#define REPEAT_INTERVAL 60 + +struct bbnsm_pwrkey { + struct regmap *regmap; + int irq; + int keycode; + int keystate; /* 1:pressed */ + struct timer_list check_timer; + struct input_dev *input; +}; + +static void bbnsm_pwrkey_check_for_events(struct timer_list *t) +{ + struct bbnsm_pwrkey *bbnsm = from_timer(bbnsm, t, check_timer); + struct input_dev *input = bbnsm->input; + u32 state; + + regmap_read(bbnsm->regmap, BBNSM_EVENTS, &state); + + state = state & BBNSM_BTN_PRESSED ? 1 : 0; + + /* only report new event if status changed */ + if (state ^ bbnsm->keystate) { + bbnsm->keystate = state; + input_event(input, EV_KEY, bbnsm->keycode, state); + input_sync(input); + pm_relax(bbnsm->input->dev.parent); + } + + /* repeat check if pressed long */ + if (state) + mod_timer(&bbnsm->check_timer, + jiffies + msecs_to_jiffies(REPEAT_INTERVAL)); +} + +static irqreturn_t bbnsm_pwrkey_interrupt(int irq, void *dev_id) +{ + struct platform_device *pdev = dev_id; + struct bbnsm_pwrkey *bbnsm = platform_get_drvdata(pdev); + u32 event; + + regmap_read(bbnsm->regmap, BBNSM_EVENTS, &event); + if (!(event & BBNSM_BTN_OFF)) + return IRQ_NONE; + + pm_wakeup_event(bbnsm->input->dev.parent, 0); + + mod_timer(&bbnsm->check_timer, + jiffies + msecs_to_jiffies(DEBOUNCE_TIME)); + + /* clear PWR OFF */ + regmap_write(bbnsm->regmap, BBNSM_EVENTS, BBNSM_BTN_OFF); + + return IRQ_HANDLED; +} + +static void bbnsm_pwrkey_act(void *pdata) +{ + struct bbnsm_pwrkey *bbnsm = pdata; + + timer_shutdown_sync(&bbnsm->check_timer); +} + +static int bbnsm_pwrkey_probe(struct platform_device *pdev) +{ + struct bbnsm_pwrkey *bbnsm; + struct input_dev *input; + struct device_node *np = pdev->dev.of_node; + int error; + + bbnsm = devm_kzalloc(&pdev->dev, sizeof(*bbnsm), GFP_KERNEL); + if (!bbnsm) + return -ENOMEM; + + bbnsm->regmap = syscon_node_to_regmap(np->parent); + if (IS_ERR(bbnsm->regmap)) { + dev_err(&pdev->dev, "bbnsm pwerkey get regmap failed\n"); + return PTR_ERR(bbnsm->regmap); + } + + if (device_property_read_u32(&pdev->dev, "linux,code", + &bbnsm->keycode)) { + bbnsm->keycode = KEY_POWER; + dev_warn(&pdev->dev, "key code is not specified, using default KEY_POWER\n"); + } + + bbnsm->irq = platform_get_irq(pdev, 0); + if (bbnsm->irq < 0) + return -EINVAL; + + /* config the BBNSM power related register */ + regmap_update_bits(bbnsm->regmap, BBNSM_CTRL, BBNSM_DP_EN, BBNSM_DP_EN); + + /* clear the unexpected interrupt before driver ready */ + regmap_write_bits(bbnsm->regmap, BBNSM_EVENTS, BBNSM_PWRKEY_EVENTS, + BBNSM_PWRKEY_EVENTS); + + timer_setup(&bbnsm->check_timer, bbnsm_pwrkey_check_for_events, 0); + + input = devm_input_allocate_device(&pdev->dev); + if (!input) { + dev_err(&pdev->dev, "failed to allocate the input device\n"); + return -ENOMEM; + } + + input->name = pdev->name; + input->phys = "bbnsm-pwrkey/input0"; + input->id.bustype = BUS_HOST; + + input_set_capability(input, EV_KEY, bbnsm->keycode); + + /* input customer action to cancel release timer */ + error = devm_add_action(&pdev->dev, bbnsm_pwrkey_act, bbnsm); + if (error) { + dev_err(&pdev->dev, "failed to register remove action\n"); + return error; + } + + bbnsm->input = input; + platform_set_drvdata(pdev, bbnsm); + + error = devm_request_irq(&pdev->dev, bbnsm->irq, bbnsm_pwrkey_interrupt, + IRQF_SHARED, pdev->name, pdev); + if (error) { + dev_err(&pdev->dev, "interrupt not available.\n"); + return error; + } + + error = input_register_device(input); + if (error) { + dev_err(&pdev->dev, "failed to register input device\n"); + return error; + } + + device_init_wakeup(&pdev->dev, true); + error = dev_pm_set_wake_irq(&pdev->dev, bbnsm->irq); + if (error) + dev_warn(&pdev->dev, "irq wake enable failed.\n"); + + return 0; +} + +static const struct of_device_id bbnsm_pwrkey_ids[] = { + { .compatible = "nxp,imx93-bbnsm-pwrkey" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, bbnsm_pwrkey_ids); + +static struct platform_driver bbnsm_pwrkey_driver = { + .driver = { + .name = "bbnsm_pwrkey", + .of_match_table = bbnsm_pwrkey_ids, + }, + .probe = bbnsm_pwrkey_probe, +}; +module_platform_driver(bbnsm_pwrkey_driver); + +MODULE_AUTHOR("Jacky Bai <ping.bai@nxp.com>"); +MODULE_DESCRIPTION("NXP bbnsm power key Driver"); +MODULE_LICENSE("GPL"); |