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Sat, 06 Jun 2026 08:06:08 -0700 (PDT) From: Jun Yan To: Dmitry Torokhov , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: Jun Yan , linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/8] Input: cap11xx - add reset gpio support Date: Sat, 6 Jun 2026 23:03:58 +0800 Message-ID: <20260606150458.250606-6-jerrysteve1101@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260606150458.250606-1-jerrysteve1101@gmail.com> References: <20260606150458.250606-1-jerrysteve1101@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Some CAP11xx devices (CAP1126/CAP1188) have a dedicated RESET pin. Add hardware reset operation to improve device reliability and ensure proper initialization on probe. Signed-off-by: Jun Yan --- drivers/input/keyboard/cap11xx.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/input/keyboard/cap11xx.c b/drivers/input/keyboard/cap11xx.c index 686174722204..7015aa7654ce 100644 --- a/drivers/input/keyboard/cap11xx.c +++ b/drivers/input/keyboard/cap11xx.c @@ -43,6 +43,10 @@ #define CAP11XX_MANUFACTURER_ID 0x5d +#define CAP11XX_T_RST_FILT_MIN 10000 +#define CAP11XX_T_RST_ON_MIN 400000 +#define CAP11XX_T_RST_ON_MAX 500000 + #ifdef CONFIG_LEDS_CLASS struct cap11xx_led { struct cap11xx_priv *priv; @@ -55,6 +59,7 @@ struct cap11xx_priv { struct regmap *regmap; struct device *dev; struct input_dev *idev; + struct gpio_desc *reset_gpio; const struct cap11xx_hw_model *model; struct cap11xx_led *leds; @@ -452,6 +457,17 @@ static int cap11xx_i2c_probe(struct i2c_client *i2c_client) if (IS_ERR(priv->regmap)) return PTR_ERR(priv->regmap); + priv->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(priv->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(priv->reset_gpio), + "Failed to get 'reset' GPIO\n"); + if (priv->reset_gpio) { + gpiod_set_value_cansleep(priv->reset_gpio, 1); + usleep_range(CAP11XX_T_RST_FILT_MIN, CAP11XX_T_RST_FILT_MIN * 2); + gpiod_set_value_cansleep(priv->reset_gpio, 0); + usleep_range(CAP11XX_T_RST_ON_MIN, CAP11XX_T_RST_ON_MAX); + } + error = regmap_read(priv->regmap, CAP11XX_REG_PRODUCT_ID, &val); if (error) return dev_err_probe(dev, error, "Failed to read product ID\n"); -- 2.54.0