From patchwork Wed Oct 4 14:56:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Duje_Mihanovi=C4=87?= X-Patchwork-Id: 13408869 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC89C15EBA for ; Wed, 4 Oct 2023 14:56:52 +0000 (UTC) Received: from mx.skole.hr (mx1.hosting.skole.hr [161.53.165.185]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 04B97C1; Wed, 4 Oct 2023 07:56:49 -0700 (PDT) Received: from mx1.hosting.skole.hr (localhost.localdomain [127.0.0.1]) by mx.skole.hr (mx.skole.hr) with ESMTP id 84E2384CBD; Wed, 4 Oct 2023 16:56:48 +0200 (CEST) From: =?utf-8?q?Duje_Mihanovi=C4=87?= Date: Wed, 04 Oct 2023 16:56:30 +0200 Subject: [PATCH RFC v5 6/6] input: ads7846: Move wait_for_sync() logic to driver Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231004-pxa-gpio-v5-6-d99ae6fceea8@skole.hr> References: <20231004-pxa-gpio-v5-0-d99ae6fceea8@skole.hr> In-Reply-To: <20231004-pxa-gpio-v5-0-d99ae6fceea8@skole.hr> To: Daniel Mack , Haojian Zhuang , Robert Jarzmik , Russell King , Alan Stern , Greg Kroah-Hartman , Linus Walleij , Bartosz Golaszewski , Andy Shevchenko , Dmitry Torokhov , Mark Brown Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-gpio@vger.kernel.org, linux-input@vger.kernel.org, linux-spi@vger.kernel.org, =?utf-8?q?Duje_Mih?= =?utf-8?q?anovi=C4=87?= X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=4268; i=duje.mihanovic@skole.hr; h=from:subject:message-id; bh=mfGlDLCki8NV8tuIB3jWgW4BpAW+ImMtQkJ8rvZ0eFs=; b=owEBbQKS/ZANAwAIAZoRnrBCLZbhAcsmYgBlHX0ko6QF0tV1IpOHpld/KlsqWZMXejAlxwX4p RioSchfOkqJAjMEAAEIAB0WIQRT351NnD/hEPs2LXiaEZ6wQi2W4QUCZR19JAAKCRCaEZ6wQi2W 4UDJEACL1rzW0OK+OZlq0VZP+NcIBMKUVlmXswhE+c4fqQzKRHdfqVHJ+HNX/f5un7+vbog19mN ghkrHhQ3na+v7tbB2lKBHQfIkfqt8Lpzo4yxZoj/xheHAaTNmC95iIzDcDejfXhn1RFqiCyg8f2 b1/VcmMwKpw881LCL3rBkpws3D6d7E9E8p1Iv62fMYRXgHsm9SJdGxCLx649Z1XT+cw63ERxQAc 9CO8OfRrwX0q2ip4aToA8AjddXA3MPIIfOn61sJh+k6xC/18IuQ5CMeF+R1pmMI4BBELNM0HWPt 4C9GwnRQFfLR2q1IgIuSYYOwKP6xizY6fYWOGeI+oXLqEjpe9yAz+xo+AV3k8SHdrTJfA5wO+Fm 2qZ50mDe3kerUqoOWAsSBf3aejym2q3i84DPemXqPkfk1Gog8R/0LyJtNh/SbP6F3zsmo58N4oo xdxemvjNCm64z0s5l+RJYxZTPB006qGhmS6UReKLHSR7GeV7mm78+y88WQ49BadsUCNol5i5nEH hEJdwUnulJII8uLcsjyGEMJMSK4j+szRDYFuxVo2eaT+cVTDsja40QF3WUhK8qBiCfQHAYeaSZl jqXP36EKy0W8BZkP9wqRrtlYzTa74nY/n4Xw2C4T6g6zXwQzfXyg5HxYpH0xmh2Cbr733QVkoKv JVBGQIlAgoCRiaw== X-Developer-Key: i=duje.mihanovic@skole.hr; a=openpgp; fpr=53DF9D4D9C3FE110FB362D789A119EB0422D96E1 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net If this code is left in the board file, the sync GPIO would have to be separated into another lookup table during conversion to the GPIO descriptor API (which is also done in this patch). The only user of this code (Sharp Spitz) is also converted in this patch. Suggested-by: Linus Walleij Reviewed-by: Linus Walleij Acked-by: Mark Brown Signed-off-by: Duje Mihanović Reviewed-by: Bartosz Golaszewski --- arch/arm/mach-pxa/spitz.c | 12 ++---------- drivers/input/touchscreen/ads7846.c | 22 +++++++++++++++------- include/linux/spi/ads7846.h | 1 - 3 files changed, 17 insertions(+), 18 deletions(-) diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c index 26ec29c9cd1b..e8bc0249b503 100644 --- a/arch/arm/mach-pxa/spitz.c +++ b/arch/arm/mach-pxa/spitz.c @@ -520,22 +520,12 @@ static inline void spitz_leds_init(void) {} * SSP Devices ******************************************************************************/ #if defined(CONFIG_SPI_PXA2XX) || defined(CONFIG_SPI_PXA2XX_MODULE) -static void spitz_ads7846_wait_for_hsync(void) -{ - while (gpio_get_value(SPITZ_GPIO_HSYNC)) - cpu_relax(); - - while (!gpio_get_value(SPITZ_GPIO_HSYNC)) - cpu_relax(); -} - static struct ads7846_platform_data spitz_ads7846_info = { .model = 7846, .vref_delay_usecs = 100, .x_plate_ohms = 419, .y_plate_ohms = 486, .pressure_max = 1024, - .wait_for_sync = spitz_ads7846_wait_for_hsync, }; static struct gpiod_lookup_table spitz_ads7846_gpio_table = { @@ -543,6 +533,8 @@ static struct gpiod_lookup_table spitz_ads7846_gpio_table = { .table = { GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_TP_INT, "pendown", GPIO_ACTIVE_LOW), + GPIO_LOOKUP("gpio-pxa", SPITZ_GPIO_HSYNC, + "sync", GPIO_ACTIVE_LOW), { } }, }; diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c index faea40dd66d0..139b0f3735d0 100644 --- a/drivers/input/touchscreen/ads7846.c +++ b/drivers/input/touchscreen/ads7846.c @@ -138,8 +138,7 @@ struct ads7846 { void *filter_data; int (*get_pendown_state)(void); struct gpio_desc *gpio_pendown; - - void (*wait_for_sync)(void); + struct gpio_desc *sync; }; enum ads7846_filter { @@ -636,9 +635,15 @@ static const struct attribute_group ads784x_attr_group = { }; /*--------------------------------------------------------------------------*/ - -static void null_wait_for_sync(void) +static void ads7846_wait_for_sync_gpio(struct ads7846 *ts) { + if (!ts->sync) + return; + while (!gpiod_get_value(ts->sync)) + cpu_relax(); + + while (gpiod_get_value(ts->sync)) + cpu_relax(); } static int ads7846_debounce_filter(void *ads, int data_idx, int *val) @@ -803,7 +808,7 @@ static void ads7846_read_state(struct ads7846 *ts) packet->last_cmd_idx = 0; while (true) { - ts->wait_for_sync(); + ads7846_wait_for_sync_gpio(ts); m = &ts->msg[msg_idx]; error = spi_sync(ts->spi, m); @@ -1261,8 +1266,6 @@ static int ads7846_probe(struct spi_device *spi) ts->penirq_recheck_delay_usecs = pdata->penirq_recheck_delay_usecs; - ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync; - snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(dev)); snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model); @@ -1361,6 +1364,11 @@ static int ads7846_probe(struct spi_device *spi) if (err) return err; + ts->sync = devm_gpiod_get_optional(dev, "sync", GPIOD_IN); + if (IS_ERR(ts->sync)) + return dev_err_probe(dev, PTR_ERR(ts->sync), + "Failed to get sync GPIO"); + err = input_register_device(input_dev); if (err) return err; diff --git a/include/linux/spi/ads7846.h b/include/linux/spi/ads7846.h index a04c1c34c344..fa7c4f119023 100644 --- a/include/linux/spi/ads7846.h +++ b/include/linux/spi/ads7846.h @@ -38,7 +38,6 @@ struct ads7846_platform_data { int gpio_pendown_debounce; /* platform specific debounce time for * the gpio_pendown */ int (*get_pendown_state)(void); - void (*wait_for_sync)(void); bool wakeup; unsigned long irq_flags; };