Messages in this thread | | | From | Fabien Parent <> | Date | Tue, 18 Feb 2020 16:14:24 +0100 | Subject | Re: [PATCH V3 2/2] drivers: input: keyboard: add mtk keypad driver |
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On Tue, Jan 14, 2020 at 1:39 PM fengping.yu <fengping.yu@mediatek.com> wrote: > > Signed-off-by: fengping.yu <fengping.yu@mediatek.com> > > Add matrix keypad driver for MTK SoC. > > --- > arch/arm64/configs/defconfig | 1 + > drivers/input/keyboard/Kconfig | 8 + > drivers/input/keyboard/Makefile | 1 + > drivers/input/keyboard/mtk-kpd.c | 280 +++++++++++++++++++++++++++++++ > 4 files changed, 290 insertions(+) > create mode 100644 drivers/input/keyboard/mtk-kpd.c > > diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig > index 8e05c39eab08..62bed77ec127 100644 > --- a/arch/arm64/configs/defconfig > +++ b/arch/arm64/configs/defconfig > @@ -315,6 +315,7 @@ CONFIG_KEYBOARD_ADC=m > CONFIG_KEYBOARD_GPIO=y > CONFIG_KEYBOARD_SNVS_PWRKEY=m > CONFIG_KEYBOARD_CROS_EC=y > +CONFIG_KEYBOARD_MTK=y > CONFIG_INPUT_TOUCHSCREEN=y > CONFIG_TOUCHSCREEN_ATMEL_MXT=m > CONFIG_INPUT_MISC=y > diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig > index 8911bc2ec42a..01747a97536b 100644 > --- a/drivers/input/keyboard/Kconfig > +++ b/drivers/input/keyboard/Kconfig > @@ -775,4 +775,12 @@ config KEYBOARD_MTK_PMIC > To compile this driver as a module, choose M here: the > module will be called pmic-keys. > > +config KEYBOARD_MTK > + tristate "MediaTek Keypad Support" > + help > + Say Y here if you want to use the keypad. > + If unuse, say N. > + To compile this driver as a module, choose M here: the > + module will be called mtk-kpd. > + > endif > diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile > index 9510325c0c5d..daa654bcce6e 100644 > --- a/drivers/input/keyboard/Makefile > +++ b/drivers/input/keyboard/Makefile > @@ -41,6 +41,7 @@ obj-$(CONFIG_KEYBOARD_MATRIX) += matrix_keypad.o > obj-$(CONFIG_KEYBOARD_MAX7359) += max7359_keypad.o > obj-$(CONFIG_KEYBOARD_MCS) += mcs_touchkey.o > obj-$(CONFIG_KEYBOARD_MPR121) += mpr121_touchkey.o > +obj-$(CONFIG_KEYBOARD_MTK) += mtk-kpd.o > obj-$(CONFIG_KEYBOARD_MTK_PMIC) += mtk-pmic-keys.o > obj-$(CONFIG_KEYBOARD_NEWTON) += newtonkbd.o > obj-$(CONFIG_KEYBOARD_NOMADIK) += nomadik-ske-keypad.o > diff --git a/drivers/input/keyboard/mtk-kpd.c b/drivers/input/keyboard/mtk-kpd.c > new file mode 100644 > index 000000000000..e36461c9dd89 > --- /dev/null > +++ b/drivers/input/keyboard/mtk-kpd.c > @@ -0,0 +1,280 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2019 MediaTek Inc. > + * Author Terry Chang <terry.chang@mediatek.com> > + */ > +#include <linux/clk.h> > +#include <linux/fs.h> > +#include <linux/gpio.h> > +#include <linux/init.h> > +#include <linux/input/matrix_keypad.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/module.h> > +#include <linux/of_address.h> > +#include <linux/of_irq.h> > +#include <linux/pinctrl/consumer.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > + > +#define KPD_NAME "mtk-kpd" > + > +#define KP_STA 0x0000 > +#define KP_MEM1 0x0004 > +#define KP_MEM2 0x0008 > +#define KP_MEM3 0x000c > +#define KP_MEM4 0x0010 > +#define KP_MEM5 0x0014 > +#define KP_DEBOUNCE 0x0018 > +#define KP_SEL 0x0020 > +#define KP_EN 0x0024 > + > +#define KP_COL0_SEL BIT(10) > +#define KP_COL1_SEL BIT(11) > +#define KP_COL2_SEL BIT(12) > + > +#define KPD_DEBOUNCE_MASK GENMASK_ULL(13, 0) > + > +#define KPD_NUM_MEMS 5 > +#define KPD_MEM5_BITS 8 > +#define KPD_NUM_KEYS 72 /* 4 * 16 + KPD_MEM5_BITS */ > + > +struct mtk_keypad { > + struct input_dev *input_dev; > + struct clk *clk; > + void __iomem *base; > + unsigned int irqnr; > + bool wakeup; > + u32 key_debounce; > + u32 n_rows; > + u32 n_cols; > + u32 keymap_state[KPD_NUM_MEMS]; > +}; > + > +static void kpd_get_keymap_state(void __iomem *kp_base, u32 state[]) > +{ > + memset_io(state, 0xff, KPD_NUM_MEMS); > + memcpy_fromio(state, kp_base, KPD_NUM_MEMS); > +} > + > +static irqreturn_t kpd_irq_handler(int irq, void *dev_id) > +{ > + /* use _nosync to avoid deadlock */ > + struct mtk_keypad *keypad = dev_id; > + unsigned short *keycode = keypad->input_dev->keycode; > + u32 new_state[KPD_NUM_MEMS], mask; > + unsigned long change = 0; > + int bit_nr; > + int pressed; > + u32 row_shift = get_count_order(keypad->n_cols); > + unsigned short code; > + int i; > + > + disable_irq_nosync(keypad->irqnr); > + > + kpd_get_keymap_state(keypad->base, new_state);
kpd_get_keymap_state(keypad->base + KP_MEM1, new_state);
> + > + for (i = 0; i < KPD_NUM_MEMS; i++) { > + change = new_state[i] ^ keypad->keymap_state[i]; > + if (!change) > + continue; > + > + for_each_set_bit(bit_nr, &change, 32) { > + mask = 1 << bit_nr; > + pressed = (new_state[i] & mask) == 0U; > + dev_dbg(&keypad->input_dev->dev, > + "%s", pressed ? "pressed" : "released"); > + > + code = keycode[MATRIX_SCAN_CODE(i, bit_nr, row_shift)]; > + > + input_report_key(keypad->input_dev, code, pressed); > + input_sync(keypad->input_dev); > + > + dev_dbg(&keypad->input_dev->dev, > + "report Linux keycode = %d\n", code); > + } > + } > + > + memcpy(keypad->keymap_state, new_state, sizeof(new_state)); > + > + enable_irq(keypad->irqnr); > + > + return IRQ_HANDLED; > +} > + > +static int kpd_get_dts_info(struct mtk_keypad *keypad) > +{ > + int ret; > + struct device *dev = keypad->input_dev->dev.parent; > + struct device_node *node = dev->of_node; > + > + ret = matrix_keypad_parse_properties(dev, &keypad->n_rows, > + &keypad->n_cols); > + > + if (ret) { > + dev_err(dev, "failed to parse keypad params.\n"); > + return ret; > + } > + > + ret = of_property_read_u32(node, "mediatek,debounce-us", > + &keypad->key_debounce); > + if (ret) { > + pr_debug("read mediatek,debounce-us error.\n"); > + return ret; > + } > + > + keypad->wakeup = of_property_read_bool(node, "wakeup-source"); > + > + dev_dbg(dev, "n_row=%d n_col=%d debounce=%d.\n", > + keypad->n_rows, keypad->n_cols, > + keypad->key_debounce); > + > + return 0; > +} > + > +static int kpd_gpio_init(struct device *dev) > +{ > + struct pinctrl *keypad_pinctrl; > + struct pinctrl_state *kpd_default; > + > + keypad_pinctrl = devm_pinctrl_get(dev); > + if (IS_ERR(keypad_pinctrl)) { > + dev_err(dev, "Cannot find keypad_pinctrl!\n"); > + > + return PTR_ERR(keypad_pinctrl); > + } > + > + kpd_default = pinctrl_lookup_state(keypad_pinctrl, "default"); > + if (IS_ERR(kpd_default)) { > + dev_err(dev, "Cannot find ecall_state!\n"); > + > + return PTR_ERR(kpd_default); > + } > + > + return pinctrl_select_state(keypad_pinctrl, kpd_default); > +} > + > +static int kpd_pdrv_probe(struct platform_device *pdev) > +{ > + struct mtk_keypad *keypad; > + struct resource *res; > + int err; > + > + if (!pdev->dev.of_node) { > + dev_err(&pdev->dev, "No device tree data present.\n"); > + return -EINVAL; > + } > + > + keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL); > + if (!keypad) > + return -ENOMEM; > + > + memset(keypad->keymap_state, 0xff, sizeof(keypad->keymap_state)); > + > + keypad->input_dev = devm_input_allocate_device(&pdev->dev); > + if (!keypad->input_dev) { > + dev_err(&pdev->dev, "input allocate device fail.\n"); > + return -ENOMEM; > + } > + > + keypad->input_dev->name = KPD_NAME; > + keypad->input_dev->id.bustype = BUS_HOST; > + keypad->input_dev->dev.parent = &pdev->dev; > + > + err = kpd_get_dts_info(keypad); > + if (err) { > + dev_err(&pdev->dev, "get dts info failed.\n"); > + return err; > + } > + > + err = matrix_keypad_build_keymap(NULL, NULL, > + keypad->n_rows, > + keypad->n_cols, > + NULL, > + keypad->input_dev); > + > + if (err) { > + dev_err(&pdev->dev, "build keymap failed.\n"); > + return err; > + } > + > + input_set_drvdata(keypad->input_dev, keypad); > + > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!res) { > + dev_err(&pdev->dev, "get IO memory resource failed.\n"); > + return -ENODEV; > + } > + > + keypad->base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(keypad->base)) { > + dev_err(&pdev->dev, "KP iomap failed\n"); > + return PTR_ERR(keypad->base); > + } > + > + writew((keypad->key_debounce * 32 / 1000 & KPD_DEBOUNCE_MASK), > + keypad->base + KP_DEBOUNCE); > + > + keypad->clk = devm_clk_get(&pdev->dev, "kpd"); > + if (IS_ERR(keypad->clk)) { > + dev_err(&pdev->dev, "get kpd-clk fail.\n"); > + return PTR_ERR(keypad->clk); > + } > + > + err = clk_prepare_enable(keypad->clk); > + if (err) { > + dev_err(&pdev->dev, "kpd-clk prepare enable failed.\n"); > + return err; > + } > + > + err = kpd_gpio_init(&pdev->dev); > + if (err) { > + dev_err(&pdev->dev, "gpio init failed\n"); > + return err; > + } > + > + keypad->irqnr = platform_get_irq(pdev, 0); > + if (!keypad->irqnr) { > + dev_err(&pdev->dev, "KP get irqnr failed\n"); > + return -EINVAL; > + } > + > + err = devm_request_irq(&pdev->dev, keypad->irqnr, > + kpd_irq_handler, 0, > + KPD_NAME, keypad); > + if (err) { > + dev_err(&pdev->dev, "register IRQ failed.\n"); > + return err; > + } > + > + err = input_register_device(keypad->input_dev); > + if (err) { > + dev_err(&pdev->dev, "register input device failed.\n"); > + return err; > + } > + > + device_init_wakeup(&pdev->dev, keypad->wakeup); > + > + platform_set_drvdata(pdev, keypad); > + > + return 0; > +} > + > +static const struct of_device_id kpd_of_match[] = { > + {.compatible = "mediatek,kp"}, > + {} > +}; > + > +static struct platform_driver kpd_pdrv = { > + .probe = kpd_pdrv_probe, > + .driver = { > + .name = KPD_NAME, > + .of_match_table = kpd_of_match, > + }, > +}; > + > +module_platform_driver(kpd_pdrv); > + > +MODULE_AUTHOR("Mediatek Corporation"); > +MODULE_DESCRIPTION("MTK Keypad (KPD) Driver"); > +MODULE_LICENSE("GPL"); > -- > 2.18.0 > _______________________________________________ > Linux-mediatek mailing list > Linux-mediatek@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-mediatek
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