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Wed, 13 May 2020 22:22:47 -0800 Received: from MTKMBS02N2.mediatek.inc (172.21.101.101) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 13 May 2020 23:21:44 -0700 Received: from mtkcas07.mediatek.inc (172.21.101.84) by mtkmbs02n2.mediatek.inc (172.21.101.101) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 14 May 2020 14:21:34 +0800 Received: from localhost.localdomain (10.15.20.246) by mtkcas07.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 14 May 2020 14:21:33 +0800 From: Fengping Yu To: Yingjoe Chen , Dmitry Torokhov , Andy Shevchenko , Marco Felsch Subject: [PATCH v7 2/3] drivers: input: keyboard: Add mtk keypad driver Date: Thu, 14 May 2020 14:17:48 +0800 Message-ID: <20200514061747.25466-3-fengping.yu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20200514061747.25466-1-fengping.yu@mediatek.com> References: <20200514061747.25466-1-fengping.yu@mediatek.com> MIME-Version: 1.0 X-TM-SNTS-SMTP: 56F992E7500F722AFCD75B8C62F31F147CFFD378102CA1068D068A4125932E722000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200513_232253_214500_9E48A56E X-CRM114-Status: GOOD ( 16.50 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "fengping.yu" , linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org From: "fengping.yu" This adds matrix keypad support for Mediatek SoCs. Signed-off-by: fengping.yu --- drivers/input/keyboard/Kconfig | 8 ++ drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/mtk-kpd.c | 223 +++++++++++++++++++++++++++++++ 3 files changed, 232 insertions(+) create mode 100644 drivers/input/keyboard/mtk-kpd.c diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index 28de965a08d5..6bae95a5f90b 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -782,6 +782,14 @@ config KEYBOARD_BCM To compile this driver as a module, choose M here: the module will be called bcm-keypad. +config KEYBOARD_MTK_KPD + tristate "MediaTek Keypad Support" + depends on OF && HAVE_CLK + help + Say Y here if you want to use the keypad on MediaTek SoCs. + If unsure, say N. + To compile this driver as a module, choose M here: the + module will be called mtk-kpd. config KEYBOARD_MTK_PMIC tristate "MediaTek PMIC keys support" depends on MFD_MT6397 diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile index 1d689fdd5c00..6c9d852c377e 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -43,6 +43,7 @@ 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-$(CONFIG_KEYBOARD_MTK_KPD) += mtk-kpd.o obj-$(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..a538f89d6696 --- /dev/null +++ b/drivers/input/keyboard/mtk-kpd.c @@ -0,0 +1,223 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 MediaTek Inc. + * Author Terry Chang + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define KPD_NAME "mtk-kpd" + +#define KP_MEM 0x0004 +#define KP_DEBOUNCE 0x0018 + +#define KPD_DEBOUNCE_MASK GENMASK(13, 0) +#define KPD_DEBOUNCE_MAX_US 256000 /*256ms */ +#define KPD_NUM_MEMS 5 +#define KPD_NUM_BITS 136 /* 4 * 32 + 8 MEM5 only use 8 BITS */ + +struct mtk_keypad { + struct regmap *regmap; + struct input_dev *input_dev; + struct clk *clk; + void __iomem *base; + bool wakeup; + u32 n_rows; + u32 n_cols; + DECLARE_BITMAP(keymap_state, KPD_NUM_BITS); +}; + +static const struct regmap_config keypad_regmap_cfg = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = sizeof(u32), + .max_register = 0x0024, +}; + +static irqreturn_t kpd_irq_handler(int irq, void *dev_id) +{ + struct mtk_keypad *keypad = dev_id; + unsigned short *keycode = keypad->input_dev->keycode; + DECLARE_BITMAP(new_state, KPD_NUM_BITS); + DECLARE_BITMAP(change, KPD_NUM_BITS); + int bit_nr; + int pressed; + unsigned short code; + + regmap_raw_read(keypad->regmap, KP_MEM, new_state, KPD_NUM_MEMS); + + bitmap_xor(change, new_state, keypad->keymap_state, KPD_NUM_BITS); + + for_each_set_bit(bit_nr, change, KPD_NUM_BITS) { + /* 1: not pressed, 0: pressed */ + pressed = !test_bit(bit_nr, new_state); + dev_dbg(&keypad->input_dev->dev, "%s", + pressed ? "pressed" : "released"); + + /* 32bit register only use low 16bit as keypad mem register */ + code = keycode[bit_nr - 16 * (BITS_TO_U32(bit_nr) - 1)]; + + 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); + } + + bitmap_copy(keypad->keymap_state, new_state, KPD_NUM_BITS); + + return IRQ_HANDLED; +} + +static int kpd_pdrv_probe(struct platform_device *pdev) +{ + struct mtk_keypad *keypad; + struct pinctrl *keypad_pinctrl; + struct pinctrl_state *kpd_default; + unsigned int irqnr; + u32 debounce; + int ret; + + keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL); + if (!keypad) + return -ENOMEM; + keypad->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(keypad->base)) + return PTR_ERR(keypad->base); + + keypad->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, + keypad->base, &keypad_regmap_cfg); + if (IS_ERR(keypad->regmap)) { + dev_err(&pdev->dev, + "regmap init failed:%ld\n", PTR_ERR(keypad->regmap)); + return PTR_ERR(keypad->regmap); + } + + bitmap_fill(keypad->keymap_state, KPD_NUM_BITS); + + keypad->input_dev = devm_input_allocate_device(&pdev->dev); + if (!keypad->input_dev) { + dev_err(&pdev->dev, "Failed to allocate input dev\n"); + return -ENOMEM; + } + + keypad->input_dev->name = KPD_NAME; + keypad->input_dev->id.bustype = BUS_HOST; + + ret = matrix_keypad_parse_properties(&pdev->dev, &keypad->n_rows, + &keypad->n_cols); + if (ret) { + dev_err(&pdev->dev, "Failed to parse keypad params\n"); + return ret; + } + + ret = device_property_read_u32(&pdev->dev, "mediatek,debounce-us", + &debounce); + if (ret) { + dev_err(&pdev->dev, "Failed to read mediatek debounce time\n"); + return ret; + } + + if (debounce > KPD_DEBOUNCE_MAX_US) { + dev_err(&pdev->dev, "Debounce time exceeds the maximum allowed time 256ms\n"); + return -EINVAL; + } + + keypad->wakeup = device_property_read_bool(&pdev->dev, "wakeup-source"); + + dev_dbg(&pdev->dev, "n_row=%d n_col=%d debounce=%d\n", + keypad->n_rows, keypad->n_cols, debounce); + + ret = matrix_keypad_build_keymap(NULL, NULL, + keypad->n_rows, + keypad->n_cols, + NULL, + keypad->input_dev); + if (ret) { + dev_err(&pdev->dev, "Failed to build keymap\n"); + return ret; + } + + input_set_drvdata(keypad->input_dev, keypad); + + regmap_write(keypad->regmap, KP_DEBOUNCE, + debounce * 32 / 1000 & KPD_DEBOUNCE_MASK); + + keypad->clk = devm_clk_get(&pdev->dev, "kpd"); + if (IS_ERR(keypad->clk)) { + return PTR_ERR(keypad->clk); + } + + ret = clk_prepare_enable(keypad->clk); + if (ret) { + dev_err(&pdev->dev, "cannot prepare/enable keypad clock\n"); + return ret; + } + + devm_add_action_or_reset(&pdev->dev, + (void (*)(void *))clk_disable_unprepare, + keypad->clk); + + keypad_pinctrl = devm_pinctrl_get(&pdev->dev); + if (IS_ERR(keypad_pinctrl)) { + return PTR_ERR(keypad_pinctrl); + } + + kpd_default = pinctrl_lookup_state(keypad_pinctrl, "default"); + if (IS_ERR(kpd_default)) { + dev_err(&pdev->dev, "No default pinctrl state\n"); + return PTR_ERR(kpd_default); + } + + pinctrl_select_state(keypad_pinctrl, kpd_default); + + irqnr = platform_get_irq(pdev, 0); + if (irqnr < 0) { + dev_err(&pdev->dev, "Failed to get irq\n"); + return -irqnr; + } + + ret = devm_request_threaded_irq(&pdev->dev, irqnr, + NULL, kpd_irq_handler, 0, + KPD_NAME, keypad); + if (ret) { + dev_err(&pdev->dev, "Failed to request IRQ#%d:%d\n", + irqnr, ret); + return ret; + } + + ret = input_register_device(keypad->input_dev); + if (ret) { + dev_err(&pdev->dev, "Failed to register device\n"); + return ret; + } + + device_init_wakeup(&pdev->dev, keypad->wakeup); + + return 0; +} + +static const struct of_device_id kpd_of_match[] = { + {.compatible = "mediatek,kp"}, + {/*sentinel*/} +}; + +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");