On Fri, May 15, 2015 at 09:36:28PM +0800, Frank.Li@xxxxxxxxxxxxx wrote: > From: Robin Gong <b38343@xxxxxxxxxxxxx> > > add snvs power key driver. > It work in imx chips after i.mx6sx > > ON/OFF key used power on/off whole system. > This driver make it wakeup from suspend state when short press > ON/OFF key. > > Long time press will trig SNVS power off chip without software > intervention. > > Signed-off-by: Robin Gong <b38343@xxxxxxxxxxxxx> > Signed-off-by: Frank Li <Frank.Li@xxxxxxxxxxxxx> Acked-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> > --- > drivers/input/keyboard/Kconfig | 11 ++ > drivers/input/keyboard/Makefile | 1 + > drivers/input/keyboard/snvs_pwrkey.c | 232 +++++++++++++++++++++++++++++++++++ > 3 files changed, 244 insertions(+) > create mode 100644 drivers/input/keyboard/snvs_pwrkey.c > > diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig > index 106fbac..61b3fab 100644 > --- a/drivers/input/keyboard/Kconfig > +++ b/drivers/input/keyboard/Kconfig > @@ -400,6 +400,17 @@ 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" > + depends on SOC_IMX6SX > + depends on OF > + 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..98c340e > --- /dev/null > +++ b/drivers/input/keyboard/snvs_pwrkey.c > @@ -0,0 +1,232 @@ > +/* > + * Driver for the IMX SNVS ON/OFF Power Key > + * 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> > +#include <linux/mfd/syscon.h> > +#include <linux/regmap.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) > + > +#define DEBOUNCE_TIME 30 > +#define REPEAT_INTERVAL 60 > + > +struct pwrkey_drv_data { > + struct regmap *snvs; > + 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; > + u32 state; > + > + regmap_read(pdata->snvs, SNVS_HPSR_REG, &state); > + state = state & 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(REPEAT_INTERVAL)); > + } > +} > + > +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); > + u32 lp_status; > + > + pm_wakeup_event(pdata->input->dev.parent, 0); > + > + regmap_read(pdata->snvs, SNVS_LPSR_REG, &lp_status); > + if (lp_status & SNVS_LPSR_SPO) > + mod_timer(&pdata->check_timer, jiffies + msecs_to_jiffies(DEBOUNCE_TIME)); > + > + /* clear SPO status */ > + regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO); > + > + 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, *snvs_np; > + int error; > + > + /* Get SNVS register Page */ > + np = pdev->dev.of_node; > + if (!np) > + return -ENODEV; > + > + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); > + if (!pdata) > + return -ENOMEM; > + > + snvs_np = of_get_parent(pdev->dev.of_node); > + if (!snvs_np) > + return -ENODEV; > + > + pdata->snvs = syscon_node_to_regmap(snvs_np); > + of_node_put(snvs_np); > + > + if (!pdata->snvs) { > + pr_err("Can't get snvs syscon\n"); > + return -ENODEV; > + } > + > + 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_property_read_bool(np, "wakeup"); > + > + pdata->irq = platform_get_irq(pdev, 0); > + if (pdata->irq < 0) { > + dev_err(&pdev->dev, "no irq defined in platform data\n"); > + return -EINVAL; > + } > + > + regmap_update_bits(pdata->snvs, SNVS_LPCR_REG, SNVS_LPCR_DEP_EN, SNVS_LPCR_DEP_EN); > + > + /* clear the unexpected interrupt before driver ready */ > + regmap_write(pdata->snvs, SNVS_LPSR_REG, SNVS_LPSR_SPO); > + > + 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_set_capability(input, EV_KEY, pdata->keycode); > + > + /* input customer action to cancel release timer */ > + error = devm_add_action(&pdev->dev, imx_snvs_pwrkey_act, pdata); > + if (error) { > + dev_err(&pdev->dev, "failed to register remove action\n"); > + return error; > + } > + > + error = devm_request_irq(&pdev->dev, pdata->irq, > + imx_snvs_pwrkey_interrupt, > + 0, pdev->name, pdev); > + > + if (error) { > + dev_err(&pdev->dev, "interrupt not available.\n"); > + return error; > + } > + > + error = input_register_device(input); > + if (error < 0) { > + dev_err(&pdev->dev, "failed to register input device\n"); > + input_free_device(input); > + return error; > + } > + > + pdata->input = input; > + platform_set_drvdata(pdev, pdata); > + > + device_init_wakeup(&pdev->dev, pdata->wakeup); > + > + 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,sec-v4.0-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", > + .pm = &imx_snvs_pwrkey_pm_ops, > + .of_match_table = imx_snvs_pwrkey_ids, > + }, > + .probe = imx_snvs_pwrkey_probe, > +}; > +module_platform_driver(imx_snvs_pwrkey_driver); > + > +MODULE_AUTHOR("Freescale Semiconductor"); > +MODULE_DESCRIPTION("i.MX snvs power key Driver"); > +MODULE_LICENSE("GPL"); > -- > 1.9.1 > -- Dmitry -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
