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From: Jiada Wang <jiada_wang@mentor.com>
To: <jikos@kernel.org>, <benjamin.tissoires@redhat.com>,
	<rydberg@bitmath.org>, <dmitry.torokhov@gmail.com>,
	<nick@shmanahar.org>
Cc: <linux-input@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<erosca@de.adit-jv.com>, <Andrew_Gabbasov@mentor.com>,
	<jiada_wang@mentor.com>
Subject: [PATCH v6 46/48] input: atmel_mxt_ts: added sysfs interface to update atmel T38 data
Date: Fri, 22 Nov 2019 17:24:00 +0900
Message-ID: <20191122082402.18173-47-jiada_wang@mentor.com> (raw)
In-Reply-To: <20191122082402.18173-1-jiada_wang@mentor.com>

From: Naveen Chakka <Naveen.Chakka@in.bosch.com>

Atmel touch controller contains T38 object where a user can store its own
data of length 64 bytes. T38 data will not be part of checksum
calculation on executing T6 BACKUP command.

format used to update the T38 data is given below:

<offset> <length> <actual_data>

offset: offset address of the data to be written in the t38 object
	(in decimal)

length: length of the data to be written into the t38 object(in decimal)

data: actual data bytes to be written into the t38 object
      (values should be in hex)

Ex:
1. 0 2 10 20
updates first two bytes of the t38 data with values 10 and 20

2. 19 6 10 2f 30 4a 50 60
updates 6 bytes of t38 data from the index 19-24 with hex values

Signed-off-by: Naveen Chakka <Naveen.Chakka@in.bosch.com>
Signed-off-by: Sanjeev Chugh <sanjeev_chugh@mentor.com>
Signed-off-by: George G. Davis <george_davis@mentor.com>
Signed-off-by: Jiada Wang <jiada_wang@mentor.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 102 +++++++++++++++++++++++
 1 file changed, 102 insertions(+)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index d22a00ec69c1..a867960dc59b 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -4027,6 +4027,106 @@ static ssize_t mxt_touch_device_status(struct device *dev, struct
 	return ret;
 }
 
+static ssize_t mxt_t38_data_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct mxt_data *data = dev_get_drvdata(dev);
+	struct mxt_object *object;
+	size_t count = 0, size;
+	u8 i, *t38_buf;
+
+	if (!data->object_table)
+		return -ENXIO;
+
+	object = mxt_get_object(data, MXT_SPT_USERDATA_T38);
+	size = mxt_obj_size(object);
+
+	/* Pre-allocate buffer large enough to hold max size of t38 object.*/
+	t38_buf = kmalloc(size, GFP_KERNEL);
+	if (!t38_buf)
+		return -ENOMEM;
+
+	count = __mxt_read_reg(data->client, object->start_address,
+			       size, t38_buf);
+	if (count)
+		goto end;
+
+	for (i = 0; i < size; i++)
+		count += scnprintf(buf + count, PAGE_SIZE - count,
+				   "[%2u]: %02x\n", i, t38_buf[i]);
+	count += scnprintf(buf + count, PAGE_SIZE - count, "\n");
+end:
+	kfree(t38_buf);
+	return count;
+}
+
+static ssize_t mxt_t38_data_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct mxt_data *data = dev_get_drvdata(dev);
+	struct mxt_object *object;
+	ssize_t ret = 0, pos, offset;
+	unsigned int i, len, index;
+	u8 *t38_buf;
+
+	if (!data->object_table)
+		return -ENXIO;
+
+	object = mxt_get_object(data, MXT_SPT_USERDATA_T38);
+
+	/* Pre-allocate buffer large enough to hold max size of t38 object.*/
+	t38_buf = kmalloc(mxt_obj_size(object), GFP_KERNEL);
+	if (!t38_buf)
+		return -ENOMEM;
+
+	ret = sscanf(buf, "%zd %d%zd", &offset, &len, &pos);
+	if (ret != 2) {
+		dev_err(dev, "Bad format: Invalid parameter to update t38\n");
+		ret = -EINVAL;
+		goto end;
+	}
+
+	if (len == 0) {
+		dev_err(dev,
+			"Bad format: Data length should not be equal to 0\n");
+		ret = -EINVAL;
+		goto end;
+	}
+
+	if (offset < 0 || ((offset + len) > 64)) {
+		dev_err(dev, "Invalid offset value to update t38\n");
+		ret = -EINVAL;
+		goto end;
+	}
+
+	index = pos;
+	for (i = 0; i < len; i++) {
+		ret = sscanf(buf + index, "%hhx%zd", t38_buf + i, &pos);
+		if (ret != 1) {
+			dev_err(dev, "Bad format: Invalid Data\n");
+			ret = -EINVAL;
+			goto end;
+		}
+		index += pos;
+	}
+
+	ret = __mxt_write_reg(data->client, object->start_address + offset,
+			      len, t38_buf);
+	if (ret)
+		goto end;
+
+	ret = mxt_t6_command(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE,
+			     true);
+	if (ret)
+		dev_err(dev, "backup command failed\n");
+	else
+		ret = count;
+end:
+	kfree(t38_buf);
+	return ret;
+}
+
 static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
 static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
 static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
@@ -4039,6 +4139,7 @@ static DEVICE_ATTR(debug_v2_enable, S_IWUSR | S_IRUSR, NULL,
 static DEVICE_ATTR(debug_notify, S_IRUGO, mxt_debug_notify_show, NULL);
 static DEVICE_ATTR(t25, 0600, mxt_t25_selftest_show, mxt_t25_selftest_store);
 static DEVICE_ATTR(touch_dev_stat, 0444, mxt_touch_device_status, NULL);
+static DEVICE_ATTR(t38_data, 0600, mxt_t38_data_show, mxt_t38_data_store);
 
 static struct attribute *mxt_attrs[] = {
 	&dev_attr_fw_version.attr,
@@ -4051,6 +4152,7 @@ static struct attribute *mxt_attrs[] = {
 	&dev_attr_debug_notify.attr,
 	&dev_attr_t25.attr,
 	&dev_attr_touch_dev_stat.attr,
+	&dev_attr_t38_data.attr,
 	NULL
 };
 
-- 
2.17.1


  parent reply index

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-22  8:23 [PATCH v6 00/48] atmel_mxt_ts misc Jiada Wang
2019-11-22  8:23 ` [PATCH v6 01/48] Input: introduce input_mt_report_slot_inactive Jiada Wang
2019-11-22  8:23 ` [PATCH v6 02/48] Input: atmel_mxt_ts - rework sysfs init/remove Jiada Wang
2019-11-22  8:23 ` [PATCH v6 03/48] Input: atmel_mxt_ts - only read messages in mxt_acquire_irq() when necessary Jiada Wang
2019-11-22  8:23 ` [PATCH v6 04/48] Input: atmel_mxt_ts - split large i2c transfers into blocks Jiada Wang
2019-11-22  8:23 ` [PATCH v6 05/48] Input: atmel_mxt_ts - output status from T48 Noise Supression Jiada Wang
2019-11-22  8:23 ` [PATCH v6 06/48] Input: atmel_mxt_ts - output status from T42 Touch Suppression Jiada Wang
2019-11-22  8:23 ` [PATCH v6 07/48] Input: atmel_mxt_ts - implement T9 vector/orientation support Jiada Wang
2019-11-22  8:23 ` [PATCH v6 08/48] Input: atmel_mxt_ts - implement T15 Key Array support Jiada Wang
2019-11-22  8:23 ` [PATCH v6 09/48] Input: atmel_mxt_ts - handle reports from T47 Stylus object Jiada Wang
2019-11-22  8:23 ` [PATCH v6 10/48] Input: atmel_mxt_ts - implement support for T107 active stylus Jiada Wang
2019-11-22  8:23 ` [PATCH v6 11/48] Input: atmel_mxt_ts - add debug for T92 gesture and T93 touch seq msgs Jiada Wang
2019-11-22  8:23 ` [PATCH v6 12/48] Input: atmel_mxt_ts - release touch state during suspend Jiada Wang
2019-11-22  8:23 ` [PATCH v6 13/48] Input: atmel_mxt_ts - add regulator control support Jiada Wang
2019-11-22  8:23 ` [PATCH v6 14/48] Input: atmel_mxt_ts - report failures in suspend/resume Jiada Wang
2019-11-22  8:23 ` [PATCH v6 15/48] Input: atmel_mxt_ts - allow specification of firmware file name Jiada Wang
2019-11-22  8:23 ` [PATCH v6 16/48] Input: atmel_mxt_ts - handle cfg filename via pdata/sysfs Jiada Wang
2019-11-22  8:23 ` [PATCH v6 17/48] Input: atmel_mxt_ts - allow input name to be specified in platform data Jiada Wang
2019-11-22  8:23 ` [PATCH v6 18/48] Input: atmel_mxt_ts - add config checksum attribute to sysfs Jiada Wang
2019-11-22  8:23 ` [PATCH v6 19/48] Input: atmel_mxt_ts - refactor firmware flash to extract context into struct Jiada Wang
2019-11-22  8:23 ` [PATCH v6 20/48] Input: atmel_mxt_ts - refactor code to enter bootloader into separate func Jiada Wang
2019-11-22  8:23 ` [PATCH v6 21/48] Input: atmel_mxt_ts - combine bootloader version query with probe Jiada Wang
2019-11-22  8:23 ` [PATCH v6 22/48] Input: atmel_mxt_ts - improve bootloader state machine handling Jiada Wang
2019-11-22  8:23 ` [PATCH v6 23/48] Input: atmel_mxt_ts - rename bl_completion to chg_completion Jiada Wang
2019-11-22  8:23 ` [PATCH v6 24/48] Input: atmel_mxt_ts - make bootloader interrupt driven Jiada Wang
2019-11-22  8:23 ` [PATCH v6 25/48] Input: atmel_mxt_ts - delay enabling IRQ when not using regulators Jiada Wang
2019-11-22  8:23 ` [PATCH v6 26/48] Input: atmel_mxt_ts - implement I2C retries Jiada Wang
2019-11-22  8:23 ` [PATCH v6 27/48] Input: atmel_mxt_ts - orientation is not present in hover Jiada Wang
2019-11-22  8:23 ` [PATCH v6 28/48] Input: atmel_mxt_ts - implement debug output for messages Jiada Wang
2019-11-22  8:23 ` [PATCH v6 29/48] Input: atmel_mxt_ts - implement improved debug message interface Jiada Wang
2019-11-22  8:23 ` [PATCH v6 30/48] Input: atmel_mxt_ts - eliminate data->raw_info_block Jiada Wang
2019-11-22  8:23 ` [PATCH v6 31/48] Input: atmel_mxt_ts - Change call-points of mxt_free_* functions Jiada Wang
2019-11-22  8:23 ` [PATCH v6 32/48] Input: atmel_mxt_ts - rely on calculated_crc rather than file config_crc Jiada Wang
2019-11-22  8:23 ` [PATCH v6 33/48] input: atmel_mxt_ts: export GPIO reset line via sysfs Jiada Wang
2019-11-22  8:23 ` [PATCH v6 34/48] input: atmel_mxt_ts: Add Missing Delay for reset handling of Atmel touch panel controller in detachable displays Jiada Wang
2019-11-22  8:23 ` [PATCH v6 35/48] Input: atmel_mxt_ts: Add support for run self-test routine Jiada Wang
2019-11-22  8:23 ` [PATCH v6 36/48] Input: atmel_mxt_ts: Limit the max bytes transferred in an i2c transaction Jiada Wang
2019-11-22  8:23 ` [PATCH v6 37/48] Input: atmel_mxt_ts: return error from mxt_process_messages_until_invalid() Jiada Wang
2019-11-22  8:23 ` [PATCH v6 38/48] Input: Atmel: improve error handling in mxt_start() Jiada Wang
2019-11-22  8:23 ` [PATCH v6 39/48] Input: Atmel: improve error handling in mxt_initialize() Jiada Wang
2019-11-22  8:23 ` [PATCH v6 40/48] Input: Atmel: improve error handling in mxt_update_cfg() Jiada Wang
2019-11-22  8:23 ` [PATCH v6 41/48] Input: Atmel: Improve error handling in mxt_initialize_input_device() Jiada Wang
2019-11-22  8:23 ` [PATCH v6 42/48] Input: Atmel: handle ReportID "0x00" while processing T5 messages Jiada Wang
2019-11-22  8:23 ` [PATCH v6 43/48] Input: Atmel: use T44 object to process " Jiada Wang
2019-11-22  8:23 ` [PATCH v6 44/48] Input: atmel_mxt_ts: use gpiod_set_value_cansleep for reset pin Jiada Wang
2019-11-22  8:23 ` [PATCH v6 45/48] input: touchscreen: atmel_mxt_ts: Added sysfs entry for touchscreen status Jiada Wang
2019-11-22  8:24 ` Jiada Wang [this message]
2019-11-22  8:24 ` [PATCH v6 47/48] Input: atmel_mxt_ts: Implement synchronization during various operation Jiada Wang
2019-11-22  8:24 ` [PATCH v6 48/48] Input: atmel_mxt_ts - Fix compilation warning Jiada Wang
2020-01-10 12:04 ` [PATCH v6 00/48] atmel_mxt_ts misc Jiada Wang

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