From: Robin Gong <b38343@xxxxxxxxxxxxx> add snvs power key driver. It work in imx chips after i.mx6sx Signed-off-by: Robin Gong <b38343@xxxxxxxxxxxxx> Signed-off-by: Frank Li <Frank.Li@xxxxxxxxxxxxx> --- Change from V1 to V2 - Remove SOC_IMX6SX depend - Add "TO compile the deiver as module.. " - Change license 2015 - BIT(x) - use pdev->dev.of_node - iounmap at remove - use linux,keycode - use linux,wakeup - Remove irq >=0 check at devm_regust_irq - Remove IRQF_NO_SUSPEND - Register irq after allocate device to avoid race condition - add devm_add_action to remove del_timer_sync drivers/input/keyboard/Kconfig | 9 ++ drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/snvs_pwrkey.c | 239 +++++++++++++++++++++++++++++++++++ 3 files changed, 249 insertions(+) create mode 100644 drivers/input/keyboard/snvs_pwrkey.c diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index 106fbac..6c1c7de 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -400,6 +400,15 @@ config KEYBOARD_MPR121 To compile this driver as a module, choose M here: the module will be called mpr121_touchkey. +config KEYBOARD_SNVS_PWRKEY + tristate "IMX SNVS Power Key Driver" + help + This is the snvs powerkey driver for the Freescale i.MX application + processors that are newer than i.MX6 SX. + + To compile this driver as a module, choose M here; the + module will be called snvs_pwrkey. + config KEYBOARD_IMX tristate "IMX keypad support" depends on ARCH_MXC diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index df28d55..1d416dd 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -51,6 +51,7 @@ obj-$(CONFIG_KEYBOARD_QT1070) += qt1070.o obj-$(CONFIG_KEYBOARD_QT2160) += qt2160.o obj-$(CONFIG_KEYBOARD_SAMSUNG) += samsung-keypad.o obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o +obj-$(CONFIG_KEYBOARD_SNVS_PWRKEY) += snvs_pwrkey.o obj-$(CONFIG_KEYBOARD_SPEAR) += spear-keyboard.o obj-$(CONFIG_KEYBOARD_STMPE) += stmpe-keypad.o obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o diff --git a/drivers/input/keyboard/snvs_pwrkey.c b/drivers/input/keyboard/snvs_pwrkey.c new file mode 100644 index 0000000..e4c2de3 --- /dev/null +++ b/drivers/input/keyboard/snvs_pwrkey.c @@ -0,0 +1,239 @@ +/* + * Copyright (C) 2015 Freescale Semiconductor, Inc. All Rights Reserved. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#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/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> + +#define SNVS_LPSR_REG 0x4C /* LP Status Register */ +#define SNVS_LPCR_REG 0x38 /* LP Control Register */ +#define SNVS_HPSR_REG 0x14 +#define SNVS_HPSR_BTN BIT(6) +#define SNVS_LPSR_SPO BIT(18) +#define SNVS_LPCR_DEP_EN BIT(5) + +struct pwrkey_drv_data { + void __iomem *ioaddr; + int irq; + int keycode; + int keystate; /* 1:pressed */ + int wakeup; + struct timer_list check_timer; + struct input_dev *input; +}; + +static void imx_imx_snvs_check_for_events(unsigned long data) +{ + struct pwrkey_drv_data *pdata = (struct pwrkey_drv_data *) data; + struct input_dev *input = pdata->input; + void __iomem *ioaddr = pdata->ioaddr; + u32 state; + + state = ((readl_relaxed(ioaddr + SNVS_HPSR_REG) & SNVS_HPSR_BTN) ? + 1 : 0); + + /* only report new event if status changed */ + if (state ^ pdata->keystate) { + pdata->keystate = state; + input_event(input, EV_KEY, pdata->keycode, state); + input_sync(input); + pm_relax(pdata->input->dev.parent); + } + + /* repeat check if pressed long */ + if (state) { + mod_timer(&pdata->check_timer, + jiffies + msecs_to_jiffies(60)); + } +} + +static irqreturn_t imx_snvs_pwrkey_interrupt(int irq, void *dev_id) +{ + struct platform_device *pdev = dev_id; + struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); + void __iomem *ioaddr = pdata->ioaddr; + u32 lp_status; + + pm_wakeup_event(pdata->input->dev.parent, 0); + lp_status = readl_relaxed(ioaddr + SNVS_LPSR_REG); + if (lp_status & SNVS_LPSR_SPO) + mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(2)); + + /* clear SPO status */ + writel_relaxed(lp_status, ioaddr + SNVS_LPSR_REG); + + return IRQ_HANDLED; +} + +static void imx_snvs_pwrkey_act(void *pdata) +{ + struct pwrkey_drv_data *pd = pdata; + + del_timer_sync(&pd->check_timer); +} + +static int imx_snvs_pwrkey_probe(struct platform_device *pdev) +{ + struct pwrkey_drv_data *pdata = NULL; + struct input_dev *input = NULL; + struct device_node *np; + void __iomem *ioaddr; + u32 val; + int ret = 0; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + /* Get SNVS register Page */ + np = pdev->dev.of_node; + if (!np) + return -ENODEV; + pdata->ioaddr = of_iomap(np, 0); + if (IS_ERR(pdata->ioaddr)) + return PTR_ERR(pdata->ioaddr); + + if (of_property_read_u32(np, "linux,keycode", &pdata->keycode)) { + pdata->keycode = KEY_POWER; + dev_warn(&pdev->dev, "KEY_POWER without setting in dts\n"); + } + + pdata->wakeup = !!of_get_property(np, "linux,wakeup", NULL); + + pdata->irq = platform_get_irq(pdev, 0); + if (pdata->irq < 0) { + dev_err(&pdev->dev, "no irq defined in platform data\n"); + return -EINVAL; + } + + ioaddr = pdata->ioaddr; + val = readl_relaxed(ioaddr + SNVS_LPCR_REG); + val |= SNVS_LPCR_DEP_EN, + writel_relaxed(val, ioaddr + SNVS_LPCR_REG); + /* clear the unexpected interrupt before driver ready */ + val = readl_relaxed(ioaddr + SNVS_LPSR_REG); + if (val & SNVS_LPSR_SPO) + writel_relaxed(val | SNVS_LPSR_SPO, ioaddr + SNVS_LPSR_REG); + + setup_timer(&pdata->check_timer, + imx_imx_snvs_check_for_events, (unsigned long) pdata); + + 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 = "snvs-pwrkey/input0"; + input->id.bustype = BUS_HOST; + input->evbit[0] = BIT_MASK(EV_KEY); + + input_set_capability(input, EV_KEY, pdata->keycode); + + /* input customer action to cancel release timer */ + ret = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata); + if (ret) { + dev_err(&pdev->dev, "failed to register remove action\n"); + return ret; + } + + ret = devm_request_irq(&pdev->dev, pdata->irq, + imx_snvs_pwrkey_interrupt, + 0, pdev->name, pdev); + + if (ret) { + dev_err(&pdev->dev, "interrupt not available.\n"); + return ret; + } + + ret = input_register_device(input); + if (ret < 0) { + dev_err(&pdev->dev, "failed to register input device\n"); + input_free_device(input); + return ret; + } + + pdata->input = input; + platform_set_drvdata(pdev, pdata); + + device_init_wakeup(&pdev->dev, pdata->wakeup); + + dev_info(&pdev->dev, "i.MX snvs powerkey probed\n"); + + return 0; +} + +static int imx_snvs_pwrkey_remove(struct platform_device *pdev) +{ + struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); + + input_unregister_device(pdata->input); + iounmap(pdata->ioaddr); + + return 0; +} + +static int imx_snvs_pwrkey_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); + + if (device_may_wakeup(&pdev->dev)) + enable_irq_wake(pdata->irq); + + return 0; +} + +static int imx_snvs_pwrkey_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct pwrkey_drv_data *pdata = platform_get_drvdata(pdev); + + if (device_may_wakeup(&pdev->dev)) + disable_irq_wake(pdata->irq); + + return 0; +} + +static const struct of_device_id imx_snvs_pwrkey_ids[] = { + { .compatible = "fsl,imx6sx-snvs-pwrkey" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, imx_snvs_pwrkey_ids); + +static SIMPLE_DEV_PM_OPS(imx_snvs_pwrkey_pm_ops, imx_snvs_pwrkey_suspend, + imx_snvs_pwrkey_resume); + +static struct platform_driver imx_snvs_pwrkey_driver = { + .driver = { + .name = "snvs_pwrkey", + .owner = THIS_MODULE, + .pm = &imx_snvs_pwrkey_pm_ops, + .of_match_table = imx_snvs_pwrkey_ids, + }, + .probe = imx_snvs_pwrkey_probe, + .remove = imx_snvs_pwrkey_remove, +}; +module_platform_driver(imx_snvs_pwrkey_driver); + +MODULE_AUTHOR("Freescale Semiconductor"); +MODULE_DESCRIPTION("i.MX snvs power key Driver"); +MODULE_LICENSE("GPL"); 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