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Wed, 22 Apr 2020 17:25:10 -0800 Received: from MTKMBS02N1.mediatek.inc (172.21.101.77) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 22 Apr 2020 18:25:15 -0700 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs02n1.mediatek.inc (172.21.101.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 23 Apr 2020 09:25:10 +0800 Received: from localhost.localdomain (10.15.20.246) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 23 Apr 2020 09:25:14 +0800 From: Fengping yu To: Dmitry Torokhov , Andy Shevchenko , Marco Felsch , Yingjoe Chen Subject: [PATCH v5 3/3] drivers: input: keyboard: add mtk keypad driver Date: Thu, 23 Apr 2020 09:20:02 +0800 Message-ID: <20200423011958.30521-4-fengping.yu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20200423011958.30521-1-fengping.yu@mediatek.com> References: <20200423011958.30521-1-fengping.yu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200422_182521_976755_4C3A84C6 X-CRM114-Status: GOOD ( 16.13 ) 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 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [216.200.240.184 listed in list.dnswl.org] 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 Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -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 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-input@vger.kernel.org, "fengping.yu" , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: "fengping.yu" Signed-off-by: fengping.yu --- drivers/input/keyboard/Kconfig | 9 ++ drivers/input/keyboard/Makefile | 1 + drivers/input/keyboard/mtk-kpd.c | 242 +++++++++++++++++++++++++++++++ 3 files changed, 252 insertions(+) create mode 100644 drivers/input/keyboard/mtk-kpd.c diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig index 4706ff09f0e8..4a387d8683b1 100644 --- a/drivers/input/keyboard/Kconfig +++ b/drivers/input/keyboard/Kconfig @@ -772,6 +772,15 @@ 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" + 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. + 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 f5b17524adf2..63324d3e36c5 100644 --- a/drivers/input/keyboard/Makefile +++ b/drivers/input/keyboard/Makefile @@ -42,6 +42,7 @@ 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..7f8f091b2734 --- /dev/null +++ b/drivers/input/keyboard/mtk-kpd.c @@ -0,0 +1,242 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 MediaTek Inc. + * Author Terry Chang + */ +#include +#include +#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 256000 +#define KPD_NUM_MEMS 5 +#define KPD_NUM_BITS 136 /* 4 * 32 + 8 MEM5 only use 8 BITS */ +#define BITS_TO_U32(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32)) + +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; + DECLARE_BITMAP(keymap_state, KPD_NUM_BITS); +}; + +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; + DECLARE_BITMAP(new_state, KPD_NUM_BITS); + DECLARE_BITMAP(change, KPD_NUM_BITS); + int bit_nr; + int pressed; + unsigned short code; + + memcpy_fromio(new_state, keypad->base + KP_MEM, KPD_NUM_MEMS); + + bitmap_xor(change, new_state, keypad->keymap_state, KPD_NUM_BITS); + + for_each_set_bit(bit_nr, change, KPD_NUM_BITS) { + pressed = test_bit(bit_nr, new_state) == 0U; + dev_dbg(&keypad->input_dev->dev, "%s", + pressed ? "pressed" : "released"); + + /* per 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_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 = device_property_read_u32(dev, "mediatek,debounce-us", + &keypad->key_debounce); + if (ret) { + dev_err(dev, "Failed to read mediatek debounce time\n"); + return ret; + } + + if (keypad->key_debounce > KPD_DEBOUNCE_MAX) { + dev_err(dev, "Debounce time exceeds the maximum allowed time 256ms\n"); + return -EINVAL; + } + + keypad->wakeup = device_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_pdrv_probe(struct platform_device *pdev) +{ + struct mtk_keypad *keypad; + struct pinctrl *keypad_pinctrl; + struct pinctrl_state *kpd_default; + int ret; + + keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL); + if (!keypad) + return -ENOMEM; + + 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 = kpd_get_dts_info(keypad); + if (ret) { + dev_err(&pdev->dev, "Failed to get dts info\n"); + return ret; + } + + 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); + + keypad->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(keypad->base)) { + dev_err(&pdev->dev, "Failed to get resource and iomap keypad\n"); + return PTR_ERR(keypad->base); + } + + if (keypad->key_debounce > KPD_DEBOUNCE_MAX) { + dev_err(&pdev->dev, "Invalid debounce time value.\n"); + return -EINVAL; + } + + 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)) { + 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; + } + + keypad_pinctrl = devm_pinctrl_get(&pdev->dev); + if (IS_ERR(keypad_pinctrl)) { + ret = PTR_ERR(keypad_pinctrl); + goto disable_kpd_clk; + } + + kpd_default = pinctrl_lookup_state(keypad_pinctrl, "default"); + if (IS_ERR(kpd_default)) { + dev_err(&pdev->dev, "No default pinctrl state\n"); + ret = PTR_ERR(kpd_default); + goto disable_kpd_clk; + } + + pinctrl_select_state(keypad_pinctrl, kpd_default); + + keypad->irqnr = platform_get_irq(pdev, 0); + if (keypad->irqnr < 0) { + dev_err(&pdev->dev, "Failed to get irq\n"); + ret = -keypad->irqnr; + goto disable_kpd_clk; + } + + ret = devm_request_irq(&pdev->dev, keypad->irqnr, + kpd_irq_handler, 0, + KPD_NAME, keypad); + if (ret) { + dev_err(&pdev->dev, "Failed to request IRQ#%d:%d\n", + keypad->irqnr, ret); + goto disable_kpd_clk; + } + + ret = input_register_device(keypad->input_dev); + if (ret) { + dev_err(&pdev->dev, "Failed to register device\n"); + goto disable_kpd_clk; + } + + device_init_wakeup(&pdev->dev, keypad->wakeup); + + platform_set_drvdata(pdev, keypad); + + return 0; + +disable_kpd_clk: + clk_disable_unprepare(keypad->clk); + return ret; +} + +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");