From patchwork Tue May 19 18:24:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Reichel X-Patchwork-Id: 11558491 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 7A245618 for ; Tue, 19 May 2020 18:25:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 696B420578 for ; Tue, 19 May 2020 18:25:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726059AbgESSZH (ORCPT ); Tue, 19 May 2020 14:25:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729286AbgESSZG (ORCPT ); Tue, 19 May 2020 14:25:06 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32DCCC08C5C0; Tue, 19 May 2020 11:25:06 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: sre) with ESMTPSA id 3142B2A2608 Received: by jupiter.universe (Postfix, from userid 1000) id 9C1BC480102; Tue, 19 May 2020 20:25:01 +0200 (CEST) From: Sebastian Reichel To: Dmitry Torokhov , Ahmet Inan , Martin Fuzzey Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@collabora.com, Sebastian Reichel Subject: [PATCHv2 4/5] Input: EXC3000: Add support to query model and fw_version Date: Tue, 19 May 2020 20:24:46 +0200 Message-Id: <20200519182447.73405-5-sebastian.reichel@collabora.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200519182447.73405-1-sebastian.reichel@collabora.com> References: <20200519182447.73405-1-sebastian.reichel@collabora.com> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Expose model and fw_version via sysfs. Also query the model in probe to make sure, that the I2C communication with the device works before successfully probing the driver. This is a bit complicated, since EETI devices do not have a sync interface. Sending the commands and directly reading does not work. Sending the command and waiting for some time is also not an option, since there might be touch events in the mean time. Last but not least we do not cache the results, since this interface can be used to check the I2C communication is still working as expected. Signed-off-by: Sebastian Reichel Reported-by: kbuild test robot --- drivers/input/touchscreen/exc3000.c | 138 +++++++++++++++++++++++++++- 1 file changed, 137 insertions(+), 1 deletion(-) diff --git a/drivers/input/touchscreen/exc3000.c b/drivers/input/touchscreen/exc3000.c index 9622cba514b3..1ae758bbf627 100644 --- a/drivers/input/touchscreen/exc3000.c +++ b/drivers/input/touchscreen/exc3000.c @@ -24,6 +24,9 @@ #define EXC3000_LEN_FRAME 66 #define EXC3000_LEN_POINT 10 +#define EXC3000_LEN_MODEL_NAME 16 +#define EXC3000_LEN_FW_VERSION 16 + #define EXC3000_MT1_EVENT 0x06 #define EXC3000_MT2_EVENT 0x18 @@ -64,6 +67,11 @@ struct exc3000_data { struct touchscreen_properties prop; struct timer_list timer; u8 buf[2 * EXC3000_LEN_FRAME]; + struct completion wait_event; + struct mutex query_lock; + int query_result; + char model[EXC3000_LEN_MODEL_NAME]; + char fw_version[EXC3000_LEN_FW_VERSION]; }; static void exc3000_report_slots(struct input_dev *input, @@ -149,6 +157,28 @@ static int exc3000_read_data(struct exc3000_data *data, return 0; } +static int exc3000_query_interrupt(struct exc3000_data *data) +{ + u8 *buf = data->buf; + int err; + + err = i2c_master_recv(data->client, buf, EXC3000_LEN_FRAME); + if (err < 0) + return err; + + if (buf[0] != 0x42) + return -EPROTO; + + if (buf[4] == 'E') + strlcpy(data->model, buf+5, sizeof(data->model)); + else if (buf[4] == 'D') + strlcpy(data->fw_version, buf+5, sizeof(data->fw_version)); + else + return -EPROTO; + + return 0; +} + static irqreturn_t exc3000_interrupt(int irq, void *dev_id) { struct exc3000_data *data = dev_id; @@ -157,6 +187,12 @@ static irqreturn_t exc3000_interrupt(int irq, void *dev_id) int slots, total_slots; int error; + if (mutex_is_locked(&data->query_lock)) { + data->query_result = exc3000_query_interrupt(data); + complete(&data->wait_event); + goto out; + } + error = exc3000_read_data(data, buf, &total_slots); if (error) { /* Schedule a timer to release "stuck" contacts */ @@ -184,11 +220,94 @@ static irqreturn_t exc3000_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +static int fw_version_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct exc3000_data *data = dev_get_drvdata(dev); + static const u8 request[68] = { + 0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'D', 0x00 + }; + struct i2c_client *client = data->client; + int err; + + mutex_lock(&data->query_lock); + + data->query_result = -ETIMEDOUT; + reinit_completion(&data->wait_event); + + err = i2c_master_send(client, request, sizeof(request)); + if (err < 0) { + mutex_unlock(&data->query_lock); + return err; + } + + wait_for_completion_interruptible_timeout(&data->wait_event, 1*HZ); + mutex_unlock(&data->query_lock); + + if (data->query_result < 0) + return data->query_result; + + return sprintf(buf, "%s\n", data->fw_version); +} +static DEVICE_ATTR_RO(fw_version); + +static ssize_t exc3000_get_model(struct exc3000_data *data) +{ + static const u8 request[68] = { + 0x67, 0x00, 0x42, 0x00, 0x03, 0x01, 'E', 0x00 + }; + struct i2c_client *client = data->client; + int err; + + mutex_lock(&data->query_lock); + data->query_result = -ETIMEDOUT; + reinit_completion(&data->wait_event); + + err = i2c_master_send(client, request, sizeof(request)); + if (err < 0) { + mutex_unlock(&data->query_lock); + return err; + } + + wait_for_completion_interruptible_timeout(&data->wait_event, 1 * HZ); + mutex_unlock(&data->query_lock); + + return data->query_result; +} + +static ssize_t model_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct exc3000_data *data = dev_get_drvdata(dev); + int err = exc3000_get_model(data); + + if (err < 0) + return err; + + return sprintf(buf, "%s\n", data->model); +} +static DEVICE_ATTR_RO(model); + +static struct attribute *sysfs_attrs[] = { + &dev_attr_fw_version.attr, + &dev_attr_model.attr, + NULL +}; + +static struct attribute_group exc3000_attribute_group = { + .attrs = sysfs_attrs +}; + +static const struct attribute_group *exc3000_attribute_groups[] = { + &exc3000_attribute_group, + NULL +}; + static int exc3000_probe(struct i2c_client *client) { struct exc3000_data *data; struct input_dev *input; - int error, max_xy; + int error, max_xy, retry; data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); if (!data) @@ -202,15 +321,19 @@ static int exc3000_probe(struct i2c_client *client) data->info = &exc3000_info[eeti_dev_id]; } timer_setup(&data->timer, exc3000_timer, 0); + init_completion(&data->wait_event); + mutex_init(&data->query_lock); input = devm_input_allocate_device(&client->dev); if (!input) return -ENOMEM; data->input = input; + input_set_drvdata(input, data); input->name = data->info->name; input->id.bustype = BUS_I2C; + input->dev.groups = exc3000_attribute_groups; max_xy = data->info->max_xy; input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0); @@ -233,6 +356,19 @@ static int exc3000_probe(struct i2c_client *client) if (error) return error; + for (retry = 0; retry < 3; ++retry) { + error = exc3000_get_model(data); + if (!error) + break; + dev_warn(&client->dev, "Retry %d get EETI EXC3000 model: %d\n", + retry + 1, error); + } + + if (error) + return error; + + dev_dbg(&client->dev, "TS Model: %s", data->model); + return 0; }