From patchwork Wed Mar 25 13:33:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Jiada" X-Patchwork-Id: 208015 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ADC0FC43331 for ; Wed, 25 Mar 2020 13:37:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86329207FC for ; Wed, 25 Mar 2020 13:37:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727840AbgCYNhJ (ORCPT ); Wed, 25 Mar 2020 09:37:09 -0400 Received: from esa4.mentor.iphmx.com ([68.232.137.252]:34650 "EHLO esa4.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728150AbgCYNhI (ORCPT ); Wed, 25 Mar 2020 09:37:08 -0400 IronPort-SDR: YrbTvNW9E+iPlMBenf+6J8gON1v0Tvbk3sl1zjjxSev92CpxySOzsg0JARiiZSqf2SJPjz/Gm+ SmP23Am0hFzhgcvczpNDzU2yOXCFXbGFhPOH3HeIdu5nJGaGFygmki7KDRJL9DMhdxDfsG0mbB 3sbLJtOh0YE4miLn4HRooT+O0hHqaWxg9HmyBCWrrOqj3fNjF7rXmtvtNKJ1c9UMGvRx/Vpevi dKxmEzh+l7H3FualfmLtBLeDFv3sr5DTRsS9IjWQzKgvf212qRtIe0WjkA5TD0tVxhC7iPaqxL sQo= X-IronPort-AV: E=Sophos;i="5.72,304,1580803200"; d="scan'208";a="47143565" Received: from orw-gwy-01-in.mentorg.com ([192.94.38.165]) by esa4.mentor.iphmx.com with ESMTP; 25 Mar 2020 05:37:08 -0800 IronPort-SDR: ixKe6D8LQ1VM26PLOiYIoYTI9G0uEJF5mWinRJuN4rGjgIB72ahnyyXlqLNxepIsFqgJweIe8O ZdjrMIVABTaQL8dZxh030doa+1ews5fN0Do0CC+Zu7criAfPrxVupV00neQ3awSuNX59K4ugtP 6r4zl4TXYHkreskskrCn6GB68iWNmZXZFKr5iclRJh2YZruiL1xWiGDqH+KtYO0b4HRQ6QVQNv CjHlYoYv+WGtnWMVg+nbVdS9NodNt4lKtKZqfM2LDjPfy7EaVuBcmG1gM4+Gk5fqj39Ooi7APF FrI= From: Jiada Wang To: , , , , , CC: , , , , Subject: [PATCH v9 52/55] input: touchscreen: atmel_mxt_ts: Added sysfs entry for touchscreen status Date: Wed, 25 Mar 2020 06:33:31 -0700 Message-ID: <20200325133334.19346-53-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200325133334.19346-1-jiada_wang@mentor.com> References: <20200325133334.19346-1-jiada_wang@mentor.com> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Naveen Chakka To know the current communication status of the touch controller during runtime, sysfs interface is added sysfs interface: /sys/class/i2c-dev/i2c-*/device/*/touch_dev_stat Executing the above sysfs interface provides two output values 1)Status of the touch device value 0 represents device is inactive value 1 represents device is active 2)Error counter value represents the number of times device in inactive since last read Signed-off-by: Naveen Chakka Signed-off-by: Sanjeev Chugh Signed-off-by: George G. Davis [jiada: Rename mxt_touch_device_status to touch_dev_stat_show Replace DEVICE_ATTR to DEVICE_ATTR_RO] Signed-off-by: Jiada Wang --- drivers/input/touchscreen/atmel_mxt_ts.c | 112 +++++++++++++++++++++-- 1 file changed, 105 insertions(+), 7 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 14bd64d194b0..0cd807988382 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -222,6 +223,7 @@ enum t100_type { #define MXT_CHG_DELAY 100 /* msec */ #define MXT_POWERON_DELAY 150 /* msec */ #define MXT_BOOTLOADER_WAIT 36E5 /* 1 minute */ +#define MXT_WATCHDOG_TIMEOUT 1000 /* msec */ /* Command to unlock bootloader */ #define MXT_UNLOCK_CMD_MSB 0xaa @@ -317,6 +319,12 @@ struct mxt_flash { struct delayed_work work; }; +struct mxt_statusinfo { + bool dev_status; + bool intp_triggered; + u32 error_count; +}; + /* Each client has this additional data */ struct mxt_data { struct i2c_client *client; @@ -372,6 +380,9 @@ struct mxt_data { const char *pcfg_name; const char *input_name; struct mxt_flash *flash; + struct work_struct watchdog_work; + struct timer_list watchdog_timer; + struct mxt_statusinfo mxt_status; /* Cached parameters from object table */ u16 T5_address; @@ -1621,11 +1632,30 @@ static int mxt_process_messages(struct mxt_data *data) return total_handled; } +static void mxt_start_wd_timer(struct mxt_data *data) +{ + mod_timer(&data->watchdog_timer, jiffies + + msecs_to_jiffies(MXT_WATCHDOG_TIMEOUT)); +} + +static void mxt_stop_wd_timer(struct mxt_data *data) +{ + /* + * Ensure we wait until the watchdog timer + * running on a different CPU finishes + */ + del_timer_sync(&data->watchdog_timer); + cancel_work_sync(&data->watchdog_work); + del_timer_sync(&data->watchdog_timer); +} + static irqreturn_t mxt_interrupt(int irq, void *dev_id) { struct mxt_data *data = dev_id; int ret; + data->mxt_status.intp_triggered = true; + if (data->in_bootloader) { complete(&data->chg_completion); @@ -1633,21 +1663,25 @@ static irqreturn_t mxt_interrupt(int irq, void *dev_id) cancel_delayed_work_sync(&data->flash->work); ret = mxt_check_bootloader(data); - return IRQ_RETVAL(ret); + ret = IRQ_RETVAL(ret); + goto exit; } - if (!data->object_table) - return IRQ_HANDLED; + if (!data->object_table) { + ret = IRQ_HANDLED; + goto exit; + } if (data->T44_address) ret = mxt_process_messages_t44(data); else ret = mxt_process_messages(data); - if (ret <= 0) - return IRQ_NONE; - else - return IRQ_HANDLED; + ret = (ret <= 0) ? IRQ_NONE : IRQ_HANDLED; + +exit: + data->mxt_status.intp_triggered = false; + return ret; } static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset, @@ -2969,6 +3003,39 @@ static int mxt_bootloader_status(struct mxt_data *data) return 0; } +static void mxt_watchdog_timer(struct timer_list *t) +{ + struct mxt_data *data = from_timer(data, t, watchdog_timer); + + if (!work_pending(&data->watchdog_work)) { + if (!data->mxt_status.intp_triggered) + schedule_work(&data->watchdog_work); + } + + mxt_start_wd_timer(data); +} + +static void mxt_watchdog_work(struct work_struct *work) +{ + struct mxt_data *data = + container_of(work, struct mxt_data, watchdog_work); + u16 info_buf; + int ret = 0; + u8 size = 2; + + if (data->suspended || data->in_bootloader) + return; + + ret = __mxt_read_reg(data->client, 0, size, &info_buf); + + if (ret) { + data->mxt_status.error_count++; + data->mxt_status.dev_status = false; + } else { + data->mxt_status.dev_status = true; + } +} + static int mxt_initialize(struct mxt_data *data) { struct i2c_client *client = data->client; @@ -3956,6 +4023,22 @@ static const struct attribute_group mxt_fw_attr_group = { .attrs = mxt_fw_attrs, }; +static ssize_t touch_dev_stat_show(struct device *dev, struct + device_attribute * attr, char *buf) +{ + struct mxt_data *data = dev_get_drvdata(dev); + int ret = 0; + + if (data->mxt_status.dev_status) + data->mxt_status.error_count = 0; + + ret = snprintf(buf, PAGE_SIZE, "%d %d\n", data->mxt_status.dev_status, + data->mxt_status.error_count); + /* clear the error counter once it is read */ + data->mxt_status.error_count = 0; + return ret; +} + static DEVICE_ATTR_RO(fw_version); static DEVICE_ATTR_RO(hw_version); static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL); @@ -3965,6 +4048,7 @@ static DEVICE_ATTR_RW(debug_enable); static DEVICE_ATTR_RW(debug_v2_enable); static DEVICE_ATTR_RO(debug_notify); static DEVICE_ATTR_RW(t25_selftest); +static DEVICE_ATTR_RO(touch_dev_stat); static struct attribute *mxt_attrs[] = { &dev_attr_fw_version.attr, @@ -3976,6 +4060,7 @@ static struct attribute *mxt_attrs[] = { &dev_attr_debug_v2_enable.attr, &dev_attr_debug_notify.attr, &dev_attr_t25_selftest.attr, + &dev_attr_touch_dev_stat.attr, NULL }; @@ -4329,6 +4414,13 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) msleep(MXT_RESET_TIME); } + INIT_WORK(&data->watchdog_work, mxt_watchdog_work); + + /* setup watchdog timer */ + timer_setup(&data->watchdog_timer, mxt_watchdog_timer, 0); + + mxt_start_wd_timer(data); + error = mxt_initialize(data); if (error) goto err_free_object; @@ -4343,8 +4435,11 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) return 0; err_free_object: + cancel_work_sync(&data->watchdog_work); + mxt_stop_wd_timer(data); mxt_free_input_device(data); mxt_free_object_table(data); + del_timer(&data->watchdog_timer); if (data->reset_gpio) { sysfs_remove_link(&client->dev.kobj, "reset"); gpiod_unexport(data->reset_gpio); @@ -4367,6 +4462,9 @@ static int mxt_remove(struct i2c_client *client) mxt_free_input_device(data); mxt_free_object_table(data); + cancel_work_sync(&data->watchdog_work); + mxt_stop_wd_timer(data); + return 0; }