Re: [PATCH 3/4] input: Add MediaTek PMIC keys support
From: Chen Zhong
Date: Wed Aug 02 2017 - 09:42:03 EST
Hi Dmitry,
Thanks for your suggestions. I will fix them in the next version.
On Tue, 2017-08-01 at 22:10 -0700, Dmitry Torokhov wrote:
> Hi Chen,
>
> On Wed, Aug 02, 2017 at 11:17:19AM +0800, Chen Zhong wrote:
> > This patch add support to handle MediaTek PMIC MT6397/MT6323 key
> > interrupts including pwrkey and homekey, also add setting for
> > long press key shutdown behavior.
> >
> > Signed-off-by: Chen Zhong <chen.zhong@xxxxxxxxxxxx>
> > ---
> > drivers/input/keyboard/mtk-pmic-keys.c | 320 ++++++++++++++++++++++++++++++++
> > 1 file changed, 320 insertions(+)
> > create mode 100644 drivers/input/keyboard/mtk-pmic-keys.c
> >
> > diff --git a/drivers/input/keyboard/mtk-pmic-keys.c b/drivers/input/keyboard/mtk-pmic-keys.c
> > new file mode 100644
> > index 0000000..0ea7d17
> > --- /dev/null
> > +++ b/drivers/input/keyboard/mtk-pmic-keys.c
> > @@ -0,0 +1,320 @@
> > +/*
> > + * Copyright (C) 2017 MediaTek, Inc.
> > + *
> > + * Author: Chen Zhong <chen.zhong@xxxxxxxxxxxx>
> > + *
> > + * This software is licensed under the terms of the GNU General Public
> > + * License version 2, as published by the Free Software Foundation, and
> > + * may be copied, distributed, and modified under those terms.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
> > +#include <linux/ioctl.h>
>
> Why do you need ioctl.h?
Indeed no need here, this will be deleted.
>
> > +#include <linux/module.h>
> > +#include <linux/kernel.h>
> > +#include <linux/input.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/kernel.h>
> > +#include <linux/of.h>
> > +#include <linux/of_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/mfd/mt6323/registers.h>
> > +#include <linux/mfd/mt6397/registers.h>
> > +#include <linux/mfd/mt6397/core.h>
> > +#include <linux/slab.h>
> > +#include <linux/irqdomain.h>
> > +
> > +#define PWRKEY_RST_EN_MASK 0x1
> > +#define PWRKEY_RST_EN_SHIFT 6
> > +#define HOMEKEY_RST_EN_MASK 0x1
> > +#define HOMEKEY_RST_EN_SHIFT 5
> > +#define RST_DU_MASK 0x3
> > +#define RST_DU_SHIFT 8
>
> Align macro values with tabs please.
I will fix the coding style issues here and below.
>
> > +
> > +struct pmic_keys_regs {
> > + u32 deb_reg;
> > + u32 deb_mask;
> > + u32 intsel_reg;
> > + u32 intsel_mask;
> > +};
> > +
> > +#define PMIC_KEYS_REGS(_deb_reg, _deb_mask, _intsel_reg, _intsel_mask) \
> > +{ \
> > + .deb_reg = _deb_reg, \
> > + .deb_mask = _deb_mask, \
> > + .intsel_reg = _intsel_reg, \
> > + .intsel_mask = _intsel_mask, \
> > +}
> > +
> > +struct pmic_regs {
> > + const struct pmic_keys_regs pwrkey_regs;
> > + const struct pmic_keys_regs homekey_regs;
> > + u32 pmic_rst_reg;
> > +};
> > +
> > +static const struct pmic_regs mt6397_regs = {
> > + .pwrkey_regs = PMIC_KEYS_REGS(MT6397_CHRSTATUS,
> > + 0x8, MT6397_INT_RSV, 0x10),
> > + .homekey_regs = PMIC_KEYS_REGS(MT6397_OCSTATUS2,
> > + 0x10, MT6397_INT_RSV, 0x8),
> > + .pmic_rst_reg = MT6397_TOP_RST_MISC,
> > +};
> > +
> > +static const struct pmic_regs mt6323_regs = {
> > + .pwrkey_regs = PMIC_KEYS_REGS(MT6323_CHRSTATUS,
> > + 0x2, MT6323_INT_MISC_CON, 0x10),
> > + .homekey_regs = PMIC_KEYS_REGS(MT6323_CHRSTATUS,
> > + 0x4, MT6323_INT_MISC_CON, 0x8),
> > + .pmic_rst_reg = MT6323_TOP_RST_MISC,
> > +};
> > +
> > +struct pmic_keys_info {
> > + struct mtk_pmic_keys *keys;
> > + const struct pmic_keys_regs *regs;
> > + int keycode;
> > + int irq;
> > + u32 hw_irq;
> > +};
> > +
> > +struct mtk_pmic_keys {
> > + struct input_dev *input_dev;
> > + struct device *dev;
> > + struct regmap *regmap;
> > + struct irq_domain *irq_domain;
> > + struct pmic_keys_info pwrkey, homekey;
> > +};
> > +
> > +enum long_press_mode {
> > + LP_DISABLE,
> > + LP_ONEKEY,
> > + LP_TWOKEY,
> > +};
> > +
> > +static void long_press_reset_setup(struct mtk_pmic_keys *keys, u32 pmic_rst_reg)
> > +{
> > + int ret;
> > + u32 long_press_mode, long_press_duration;
> > +
> > + ret = of_property_read_u32(keys->dev->of_node,
> > + "mediatek,long-press-duration", &long_press_duration);
> > + if (ret)
> > + long_press_duration = 0;
> > +
> > + regmap_update_bits(keys->regmap, pmic_rst_reg,
> > + RST_DU_MASK << RST_DU_SHIFT,
> > + long_press_duration << RST_DU_SHIFT);
>
> Please align arguments with the opening parenthesis.
>
>
> > + regmap_update_bits(keys->regmap, pmic_rst_reg,
> > + PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT,
> > + PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT);
> > +
> > + ret = of_property_read_u32(keys->dev->of_node,
> > + "mediatek,long-press-mode", &long_press_mode);
> > +
> > + if (!ret && long_press_mode == LP_ONEKEY) {
> > + regmap_update_bits(keys->regmap, pmic_rst_reg,
> > + HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT, 0);
> > + } else if (!ret && long_press_mode == LP_TWOKEY) {
> > + regmap_update_bits(keys->regmap, pmic_rst_reg,
> > + HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT,
> > + HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT);
> > + } else {
> > + regmap_update_bits(keys->regmap, pmic_rst_reg,
> > + PWRKEY_RST_EN_MASK << PWRKEY_RST_EN_SHIFT, 0);
> > + regmap_update_bits(keys->regmap, pmic_rst_reg,
> > + HOMEKEY_RST_EN_MASK << HOMEKEY_RST_EN_SHIFT, 0);
> > + }
>
> if (ret)
> long_press_mode = LP_DISABLE;
>
> switch (long_press_mode) {
> case LP_ONEKEY:
> ...
> case LP_TWOKEY:
> ...
> case LP_DISABLE:
> default:
> ...
> };
Got it.
>
> > +}
> > +
> > +static irqreturn_t mtk_pmic_keys_irq_handler_thread(int irq, void *data)
> > +{
> > + struct pmic_keys_info *info = data;
> > + u32 key_deb, pressed;
> > +
> > + regmap_read(info->keys->regmap, info->regs->deb_reg, &key_deb);
> > +
> > + key_deb &= info->regs->deb_mask;
> > +
> > + pressed = !key_deb;
> > +
> > + input_report_key(info->keys->input_dev, info->keycode, pressed);
> > + input_sync(info->keys->input_dev);
> > +
> > + dev_info(info->keys->dev, "[PMICKEYS] (%s) key =%d using PMIC\n",
> > + pressed ? "pressed" : "released", info->keycode);
>
> dev_dbg()?
>
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int mtk_pmic_key_setup(struct mtk_pmic_keys *keys,
> > + const char *propname, struct pmic_keys_info *info, bool wakeup)
> > +{
> > + int ret;
> > +
> > + ret = of_property_read_u32(keys->dev->of_node,
> > + propname, &info->keycode);
> > + if (ret)
> > + return 0;
> > +
> > + if (!info->keycode)
> > + return 0;
> > +
> > + info->keys = keys;
> > +
> > + ret = regmap_update_bits(keys->regmap, info->regs->intsel_reg,
> > + info->regs->intsel_mask, info->regs->intsel_mask);
> > + if (ret < 0)
> > + return ret;
> > +
> > + info->irq = irq_create_mapping(keys->irq_domain, info->hw_irq);
> > + if (info->irq <= 0)
> > + return -EINVAL;
>
> This is wrong. The leaf driver should not have to create and manage IRQ
> mappings, the core module should do that. In fact, you should pass IRQ
> domain to devm_mfd_add_devices() and it will create mapping for IRQ
> resources automatically.
>
OK, I will pass IRQ domain to devm_mfd_add_devices() in mfd core driver
and remove the mapping here.
> > +
> > + ret = devm_request_threaded_irq(keys->dev, info->irq, NULL,
> > + mtk_pmic_keys_irq_handler_thread,
> > + IRQF_ONESHOT | IRQF_TRIGGER_HIGH,
> > + "mtk-pmic-keys", info);
> > + if (ret) {
> > + dev_err(keys->dev, "Failed to request IRQ: %d: %d\n",
> > + info->irq, ret);
> > + return ret;
> > + }
> > +
> > + if (wakeup)
> > + irq_set_irq_wake(info->irq, 1);
> > +
> > + __set_bit(info->keycode, keys->input_dev->keybit);
>
> input_set_capability(keys->input_dev, EV_KEY, info->keycode);
>
Got it.
> > +
> > + return 0;
> > +}
> > +
> > +static void mtk_pmic_keys_dispose_irq(struct mtk_pmic_keys *keys)
> > +{
> > + if (keys->pwrkey.irq)
> > + irq_dispose_mapping(keys->pwrkey.irq);
> > +
> > + if (keys->homekey.irq)
> > + irq_dispose_mapping(keys->homekey.irq);
> > +}
> > +
> > +static const struct of_device_id of_pmic_keys_match_tbl[] = {
> > + {
> > + .compatible = "mediatek,mt6397-keys",
> > + .data = &mt6397_regs,
> > + }, {
> > + .compatible = "mediatek,mt6323-keys",
> > + .data = &mt6323_regs,
> > + }, {
> > + /* sentinel */
> > + }
> > +};
> > +MODULE_DEVICE_TABLE(of, of_pmic_keys_match_tbl);
> > +
> > +static int mtk_pmic_keys_probe(struct platform_device *pdev)
> > +{
> > + int ret;
> > + struct resource *res;
> > + struct mt6397_chip *pmic_chip = dev_get_drvdata(pdev->dev.parent);
> > + struct mtk_pmic_keys *keys;
> > + const struct pmic_regs *pmic_regs;
> > + struct input_dev *input_dev;
> > + const struct of_device_id *of_id =
> > + of_match_device(of_pmic_keys_match_tbl, &pdev->dev);
> > +
> > + keys = devm_kzalloc(&pdev->dev,
> > + sizeof(struct mtk_pmic_keys), GFP_KERNEL);
>
> sizeof(*keys)
>
> > + if (!keys)
> > + return -ENOMEM;
> > +
> > + keys->dev = &pdev->dev;
> > + keys->regmap = pmic_chip->regmap;
> > + keys->irq_domain = pmic_chip->irq_domain;
> > +
> > + pmic_regs = of_id->data;
> > + keys->pwrkey.regs = &pmic_regs->pwrkey_regs;
> > + keys->homekey.regs = &pmic_regs->homekey_regs;
> > + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > + if (!res) {
> > + dev_err(&pdev->dev, "no IRQ resource\n");
> > + return -ENODEV;
> > + }
> > +
> > + keys->pwrkey.hw_irq = res->start;
> > + keys->homekey.hw_irq = res->end;
>
> Why not 2 IRQ resources, one for pwrkey and another is for homekey?
>
I will split them to 2 IRQ resources.
> > +
> > + keys->input_dev = input_dev = devm_input_allocate_device(keys->dev);
> > + if (!input_dev) {
> > + dev_err(&pdev->dev, "[PMICKEYS] input allocate device fail.\n");
> > + return -ENOMEM;
> > + }
> > +
> > + input_dev->name = "mtk-pmic-keys";
> > + input_dev->id.bustype = BUS_HOST;
> > + input_dev->id.vendor = 0x0001;
> > + input_dev->id.product = 0x0001;
> > + input_dev->id.version = 0x0001;
> > + input_dev->dev.parent = &pdev->dev;
> > +
> > + __set_bit(EV_KEY, input_dev->evbit);
>
> Not needed.
OK, I wil remove the not needed ones here and below.
>
> > +
> > + ret = mtk_pmic_key_setup(keys, "mediatek,pwrkey-code",
> > + &keys->pwrkey, true);
> > + if (ret)
> > + goto out_dispose_irq;
> > +
> > + ret = mtk_pmic_key_setup(keys, "mediatek,homekey-code",
> > + &keys->homekey, false);
> > + if (ret)
> > + goto out_dispose_irq;
> > +
> > + ret = input_register_device(input_dev);
> > + if (ret) {
> > + dev_err(&pdev->dev,
> > + "[PMICKEYS] register input device failed (%d)\n", ret);
> > + input_free_device(input_dev);
>
> Not needed as device is allocated with devm.
>
> > + return ret;
> > + }
> > +
> > + input_set_drvdata(input_dev, keys);
>
> I do not believe you use input_get_drvdata() anywhere.
>
OK, I will remove this operation.
> > +
> > + long_press_reset_setup(keys, pmic_regs->pmic_rst_reg);
> > +
> > + return 0;
> > +
> > +out_dispose_irq:
> > + mtk_pmic_keys_dispose_irq(keys);
> > + return ret;
> > +}
> > +
> > +static int mtk_pmic_keys_remove(struct platform_device *pdev)
> > +{
> > + struct mtk_pmic_keys *keys = platform_get_drvdata(pdev);
> > +
> > + mtk_pmic_keys_dispose_irq(keys);
> > +
> > + input_unregister_device(keys->input_dev);
>
> Not needed as input device is registered with devm.
>
> > +
> > + return 0;
> > +}
> > +
> > +static struct platform_driver pmic_keys_pdrv = {
> > + .probe = mtk_pmic_keys_probe,
> > + .remove = mtk_pmic_keys_remove,
> > + .driver = {
> > + .name = "mtk-pmic-keys",
> > + .owner = THIS_MODULE,
>
> Not needed.
>
> > + .of_match_table = of_pmic_keys_match_tbl,
> > + },
> > +};
> > +
> > +module_platform_driver(pmic_keys_pdrv);
> > +
> > +MODULE_LICENSE("GPL v2");
> > +MODULE_AUTHOR("Chen Zhong <chen.zhong@xxxxxxxxxxxx>");
> > +MODULE_DESCRIPTION("MTK pmic-keys driver v0.1");
> > +MODULE_ALIAS("keypad:pmic");
>
> This is a curious alias. Why is it needed?
It is not needed, will be removed.
>
> Thanks.
>