From patchwork Fri May 8 05:56:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Jiada" X-Patchwork-Id: 11535595 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6C3EB1668 for ; Fri, 8 May 2020 05:59:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 591C02070B for ; Fri, 8 May 2020 05:59:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726877AbgEHF7W (ORCPT ); Fri, 8 May 2020 01:59:22 -0400 Received: from esa2.mentor.iphmx.com ([68.232.141.98]:22062 "EHLO esa2.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726807AbgEHF7V (ORCPT ); Fri, 8 May 2020 01:59:21 -0400 IronPort-SDR: 7ejFNV7DlasemuhOxpPQtyNZgAMj3OR6gQ3CkTQtrAtjmrFGg5MOldyU5JynAk/of83nm3rGLa 7D9FD0MWZ5WxyUtYC8xoXrFKB5W7rUHwqiyO8A1+qDeMtMMcfjJcyn5CJiLSdbXZtymEdfhNwd bwCbmgVeXkgosX4VNlSVeQ33JTKtibkopz8iftwP6kwjjYG+Uvh6Iu4sfy72d1lJO1GW+eylWI RcAZ6uruWJDvdoacOAJ04D/xs/vm2pdfTPsZohCdV6xklBZuIJChizSJMdjvo+jsTzfNs1oAqY KMM= X-IronPort-AV: E=Sophos;i="5.73,366,1583222400"; d="scan'208";a="48589123" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa2.mentor.iphmx.com with ESMTP; 07 May 2020 21:59:21 -0800 IronPort-SDR: GgCtuscyCbhiiPN+0Tz2L8HbHQXeC6i/Z4bXy7h9lbA9eNCTbvG00njYEbgZAwrjeRoYt9WJ76 0biTGB28/uASZyNXbhxP248k2dugZo9EV4yVhba7a8Yw9T63+IgxkTuvGlqtHhC6bsySNS2kDe vYmSnBswG9wMtg+0ZPdFn/L2SF6QbGDfD3I6dEP6wRm0O1M1ZDoyjAM1TemCoQyRfwWjTBSYmq pkLncJuEDOesAZiqD27ze0iudLZf000GE+lOocBmh36+fPKC7HMl9dipDhpHvmpa+QyhAi8vOy 0/w= From: Jiada Wang To: , , , , CC: , , , , Subject: [PATCH v11 37/56] Input: atmel_mxt_ts - implement improved debug message interface Date: Thu, 7 May 2020 22:56:37 -0700 Message-ID: <20200508055656.96389-38-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200508055656.96389-1-jiada_wang@mentor.com> References: <20200508055656.96389-1-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: Nick Dyer Implement improved debug message interface Signed-off-by: Nick Dyer (cherry picked from ndyer/linux/for-upstream commit 078569c13c88dcb6f8d882bfe17168587712df7d) [gdavis: Resolve forward port conflicts due to v4.14.51 commit 960fe000b1d3 ("Input: atmel_mxt_ts - fix the firmware update").] Signed-off-by: George G. Davis [gdavis: Squash fixes from Dirk Behme: - Input: atmel_mxt_ts - add missing unlock in error path - Input: atmel_mxt_ts - add missing unlock in error path - Input: atmel_mxt_ts - call mxt_debug_msg_remove() in error path - Input: atmel_mxt_ts - protect debug_v2_enabled by mutex Signed-off-by: Dirk Behme [gdavis: Squash fix from Vladimir Zapolskiy: - Input: atmel_mxt_ts - simplify debug_msg binary attribute handling] Signed-off-by: Vladimir Zapolskiy [jiada: Rename mxt_debug_notify_show to debug_notify_show Rename mxt_debug_v2_enable_store to debug_v2_enable_store Add debug_v2_enable_show Replace DEVICE_ATTR with DEVICE_ATTR_[RW|RO] ] Signed-off-by: Jiada Wang --- drivers/input/touchscreen/atmel_mxt_ts.c | 201 ++++++++++++++++++++++- 1 file changed, 200 insertions(+), 1 deletion(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 7d48c4d1f57d..92c883087a4f 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -243,6 +243,8 @@ enum t100_type { #define MXT_PIXELS_PER_MM 20 +#define DEBUG_MSG_MAX 200 + struct mxt_info { u8 family_id; u8 variant_id; @@ -337,6 +339,11 @@ struct mxt_data { u8 t100_aux_area; u8 t100_aux_vect; bool debug_enabled; + bool debug_v2_enabled; + u8 *debug_msg_data; + u16 debug_msg_count; + struct bin_attribute *debug_msg_attr; + struct mutex debug_msg_lock; u8 max_reportid; u32 config_crc; u32 info_crc; @@ -469,6 +476,144 @@ static void mxt_dump_message(struct mxt_data *data, u8 *message) data->T5_msg_size, message); } +static void mxt_debug_msg_enable(struct mxt_data *data) +{ + struct device *dev = &data->client->dev; + + if (data->debug_v2_enabled) + return; + + mutex_lock(&data->debug_msg_lock); + + data->debug_msg_data = kcalloc(DEBUG_MSG_MAX, + data->T5_msg_size, GFP_KERNEL); + if (!data->debug_msg_data) { + mutex_unlock(&data->debug_msg_lock); + return; + } + + data->debug_v2_enabled = true; + mutex_unlock(&data->debug_msg_lock); + + dev_dbg(dev, "Enabled message output\n"); +} + +static void mxt_debug_msg_disable(struct mxt_data *data) +{ + struct device *dev = &data->client->dev; + + if (!data->debug_v2_enabled) + return; + + mutex_lock(&data->debug_msg_lock); + + data->debug_v2_enabled = false; + + kfree(data->debug_msg_data); + data->debug_msg_data = NULL; + data->debug_msg_count = 0; + mutex_unlock(&data->debug_msg_lock); + dev_dbg(dev, "Disabled message output\n"); +} + +static void mxt_debug_msg_add(struct mxt_data *data, u8 *msg) +{ + struct device *dev = &data->client->dev; + + mutex_lock(&data->debug_msg_lock); + + if (!data->debug_msg_data) { + mutex_unlock(&data->debug_msg_lock); + dev_err(dev, "No buffer!\n"); + return; + } + + if (data->debug_msg_count < DEBUG_MSG_MAX) { + memcpy(data->debug_msg_data + + data->debug_msg_count * data->T5_msg_size, + msg, + data->T5_msg_size); + data->debug_msg_count++; + } else { + dev_dbg(dev, "Discarding %u messages\n", data->debug_msg_count); + data->debug_msg_count = 0; + } + + mutex_unlock(&data->debug_msg_lock); + + sysfs_notify(&data->client->dev.kobj, NULL, "debug_notify"); +} + +static ssize_t mxt_debug_msg_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, loff_t off, size_t bytes) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct mxt_data *data = dev_get_drvdata(dev); + int count; + size_t bytes_read; + + if (!data->debug_msg_data) { + dev_err(dev, "No buffer!\n"); + return 0; + } + + count = bytes / data->T5_msg_size; + + if (count > DEBUG_MSG_MAX) + count = DEBUG_MSG_MAX; + + mutex_lock(&data->debug_msg_lock); + + if (count > data->debug_msg_count) + count = data->debug_msg_count; + + bytes_read = count * data->T5_msg_size; + + memcpy(buf, data->debug_msg_data, bytes_read); + data->debug_msg_count = 0; + + mutex_unlock(&data->debug_msg_lock); + + return bytes_read; +} + +static struct bin_attribute debug_msg_attr = { + .attr = { + .name = "debug_msg", + .mode = 0444, + }, + .read = mxt_debug_msg_read, +}; + +static int mxt_debug_msg_init(struct mxt_data *data) +{ + /* + * Binary attribute is not used in callback, removal is done by name, + * so it is safe to update a single struct bin_attribute entity + */ + debug_msg_attr.size = data->T5_msg_size * DEBUG_MSG_MAX; + + if (sysfs_create_bin_file(&data->client->dev.kobj, + &debug_msg_attr) < 0) { + dev_err(&data->client->dev, "Failed to create %s\n", + debug_msg_attr.attr.name); + return -EINVAL; + } + + data->debug_msg_attr = &debug_msg_attr; + + return 0; +} + +static void mxt_debug_msg_remove(struct mxt_data *data) +{ + if (data->debug_msg_attr) { + sysfs_remove_bin_file(&data->client->dev.kobj, + data->debug_msg_attr); + data->debug_msg_attr = NULL; + } +} + static int mxt_wait_for_completion(struct mxt_data *data, struct completion *comp, unsigned int timeout_ms) @@ -1257,6 +1402,9 @@ static int mxt_proc_message(struct mxt_data *data, u8 *message) if (dump) mxt_dump_message(data, message); + if (data->debug_v2_enabled) + mxt_debug_msg_add(data, message); + return 1; } @@ -2660,6 +2808,10 @@ static int mxt_initialize(struct mxt_data *data) if (error) return error; + error = mxt_debug_msg_init(data); + if (error) + goto err_free_sysfs; + error = request_firmware_nowait(THIS_MODULE, true, data->cfg_name ? data->cfg_name : MXT_CFG_NAME, @@ -2669,11 +2821,13 @@ static int mxt_initialize(struct mxt_data *data) if (error) { dev_err(&client->dev, "Failed to invoke firmware loader: %d\n", error); - goto err_free_sysfs; + goto err_free_dbg_msg; } return 0; +err_free_dbg_msg: + mxt_debug_msg_remove(data); err_free_sysfs: mxt_sysfs_remove(data); return error; @@ -3335,6 +3489,7 @@ static int mxt_enter_bootloader(struct mxt_data *data) return ret; data->in_bootloader = true; + mxt_debug_msg_remove(data); mxt_sysfs_remove(data); mxt_free_input_device(data); mxt_free_object_table(data); @@ -3506,6 +3661,44 @@ static ssize_t update_cfg_store(struct device *dev, return ret; } +static ssize_t debug_notify_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "0\n"); +} + +static ssize_t debug_v2_enable_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + struct mxt_data *data = dev_get_drvdata(dev); + u8 i; + ssize_t ret; + + if (kstrtou8(buf, 0, &i) == 0 && i < 2) { + if (i == 1) + mxt_debug_msg_enable(data); + else + mxt_debug_msg_disable(data); + + ret = count; + } else { + dev_dbg(dev, "debug_enabled write error\n"); + ret = -EINVAL; + } + + return ret; +} + +static ssize_t debug_v2_enable_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct mxt_data *data = dev_get_drvdata(dev); + char c; + + c = data->debug_v2_enabled ? '1' : '0'; + return scnprintf(buf, PAGE_SIZE, "%c\n", c); +} + static ssize_t debug_enable_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -3553,6 +3746,8 @@ static DEVICE_ATTR_RO(object); static DEVICE_ATTR_WO(update_cfg); static DEVICE_ATTR_RO(config_crc); static DEVICE_ATTR_RW(debug_enable); +static DEVICE_ATTR_RW(debug_v2_enable); +static DEVICE_ATTR_RO(debug_notify); static struct attribute *mxt_attrs[] = { &dev_attr_fw_version.attr, @@ -3561,6 +3756,8 @@ static struct attribute *mxt_attrs[] = { &dev_attr_update_cfg.attr, &dev_attr_config_crc.attr, &dev_attr_debug_enable.attr, + &dev_attr_debug_v2_enable.attr, + &dev_attr_debug_notify.attr, NULL }; @@ -3851,6 +4048,7 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) init_completion(&data->chg_completion); init_completion(&data->reset_completion); init_completion(&data->crc_completion); + mutex_init(&data->debug_msg_lock); data->suspend_mode = dmi_check_system(chromebook_T9_suspend_dmi) ? MXT_SUSPEND_T9_CTRL : MXT_SUSPEND_DEEP_SLEEP; @@ -3916,6 +4114,7 @@ static int mxt_remove(struct i2c_client *client) disable_irq(data->irq); sysfs_remove_group(&client->dev.kobj, &mxt_fw_attr_group); + mxt_debug_msg_remove(data); mxt_sysfs_remove(data); mxt_free_input_device(data); mxt_free_object_table(data);