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Subject[PATCH v10 07/18] input: cyapa: add sysfs interfaces supported in the cyapa driver
Date
Add device's basic control and features supported in cyapa driver through
sysfs file system interfaces. These interfaces are commonly used in
pre- and after production, for trackpad device state checking, managing
and firmware image updating.
These interfaces including mode, firmware_version and product_id interfaces
for reading firmware version and trackpad device product id values,
and including update_fw interface to command firmware image update
process. Also including baseline and calibrate interfaces for
reading and checking trackpad device's sensors states.
TEST=test on Chromebooks.

Signed-off-by: Dudley Du <dudl@cypress.com>
---
drivers/input/mouse/cyapa.c | 267 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 267 insertions(+)

diff --git a/drivers/input/mouse/cyapa.c b/drivers/input/mouse/cyapa.c
index 51c0d86..80a21ed 100644
--- a/drivers/input/mouse/cyapa.c
+++ b/drivers/input/mouse/cyapa.c
@@ -32,6 +32,8 @@
#define CYAPA_ADAPTER_FUNC_SMBUS 2
#define CYAPA_ADAPTER_FUNC_BOTH 3

+#define CYAPA_FW_NAME "cyapa.bin"
+
const char unique_str[] = "CYTRA";

/* Returns 0 on success, else negative errno on failure. */
@@ -702,6 +704,258 @@ static int cyapa_start_runtime(struct cyapa *cyapa)
}
#endif /* CONFIG_PM_RUNTIME */

+static ssize_t cyapa_show_fm_ver(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int error;
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+ error = scnprintf(buf, PAGE_SIZE, "%d.%d\n", cyapa->fw_maj_ver,
+ cyapa->fw_min_ver);
+ mutex_unlock(&cyapa->state_sync_lock);
+ return error;
+}
+
+static ssize_t cyapa_show_product_id(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ int size;
+ int error;
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+ size = scnprintf(buf, PAGE_SIZE, "%s\n", cyapa->product_id);
+ mutex_unlock(&cyapa->state_sync_lock);
+ return size;
+}
+
+static int cyapa_firmware(struct cyapa *cyapa, const char *fw_name)
+{
+ struct device *dev = &cyapa->client->dev;
+ const struct firmware *fw;
+ int error;
+
+ error = request_firmware(&fw, fw_name, dev);
+ if (error) {
+ dev_err(dev, "Could not load firmware from %s: %d\n",
+ fw_name, error);
+ return error;
+ }
+
+ if (cyapa->ops->check_fw) {
+ error = cyapa->ops->check_fw(cyapa, fw);
+ if (error) {
+ dev_err(dev, "Invalid CYAPA firmware image: %s\n",
+ fw_name);
+ goto done;
+ }
+ } else {
+ dev_err(dev, "No valid device ops->check_fw handler set.\n");
+ error = -ENODEV;
+ goto done;
+ }
+
+ /*
+ * Resume the potentially suspended device because doing FW
+ * update on a device not in the FULL mode has a chance to
+ * fail.
+ */
+ pm_runtime_get_sync(dev);
+
+ if (cyapa->ops->bl_enter) {
+ error = cyapa->ops->bl_enter(cyapa);
+ if (error)
+ goto err_detect;
+ }
+
+ if (cyapa->ops->bl_activate) {
+ error = cyapa->ops->bl_activate(cyapa);
+ if (error)
+ goto err_detect;
+ }
+
+ if (cyapa->ops->bl_initiate) {
+ error = cyapa->ops->bl_initiate(cyapa, fw);
+ if (error)
+ goto err_detect;
+ }
+
+ if (cyapa->ops->update_fw) {
+ error = cyapa->ops->update_fw(cyapa, fw);
+ if (error)
+ goto err_detect;
+ }
+
+ if (cyapa->ops->bl_verify_app_integrity) {
+ error = cyapa->ops->bl_verify_app_integrity(cyapa);
+ if (error)
+ goto err_detect;
+ }
+
+err_detect:
+ pm_runtime_put_noidle(dev);
+
+done:
+ release_firmware(fw);
+ return error;
+}
+
+static ssize_t cyapa_update_fw_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ char fw_name[64];
+ int error;
+
+ if (count > 64) {
+ dev_err(dev, "File name too long\n");
+ return -EINVAL;
+ }
+
+ memcpy(fw_name, buf, count);
+ if (fw_name[count - 1] == '\n')
+ fw_name[count - 1] = '\0';
+ else
+ fw_name[count] = '\0';
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+
+ if (cyapa->operational)
+ cyapa->operational = false;
+
+ error = cyapa_firmware(cyapa, fw_name);
+ if (error)
+ dev_err(dev, "firmware update failed: %d\n", error);
+ else
+ dev_dbg(dev, "firmware update successfully done.\n");
+
+ /*
+ * Redetect trackpad device states because firmware update process
+ * will reset trackpad device into bootloader mode.
+ */
+ cyapa_detect(cyapa);
+
+ mutex_unlock(&cyapa->state_sync_lock);
+
+ return error ? error : count;
+}
+
+static ssize_t cyapa_calibrate_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ int error;
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+
+ if (!cyapa->ops->calibrate_store) {
+ dev_err(dev, "Calibrate operation not supported.\n");
+ error = -ENOTSUPP;
+ } else {
+ error = cyapa->ops->calibrate_store(dev, attr, buf, count);
+ }
+
+ mutex_unlock(&cyapa->state_sync_lock);
+ return error < 0 ? error : count;
+}
+
+static ssize_t cyapa_show_baseline(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ ssize_t error;
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+
+ if (!cyapa->ops->show_baseline) {
+ dev_err(dev, "Calibrate operation not supported.\n");
+ error = -ENOTSUPP;
+ } else {
+ error = cyapa->ops->show_baseline(dev, attr, buf);
+ }
+
+ mutex_unlock(&cyapa->state_sync_lock);
+ return error;
+}
+
+static char *cyapa_state_to_string(struct cyapa *cyapa)
+{
+ switch (cyapa->state) {
+ case CYAPA_STATE_BL_BUSY:
+ return "bootloader busy";
+ case CYAPA_STATE_BL_IDLE:
+ return "bootloader idle";
+ case CYAPA_STATE_BL_ACTIVE:
+ return "bootloader active";
+ case CYAPA_STATE_GEN5_BL:
+ return "bootloader";
+ case CYAPA_STATE_OP:
+ case CYAPA_STATE_GEN5_APP:
+ return "operational";
+ default:
+ return "invalid mode";
+ }
+}
+
+static ssize_t cyapa_show_mode(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ int size;
+ int error;
+
+ error = mutex_lock_interruptible(&cyapa->state_sync_lock);
+ if (error)
+ return error;
+
+ size = scnprintf(buf, PAGE_SIZE, "gen%d %s\n",
+ cyapa->gen, cyapa_state_to_string(cyapa));
+
+ mutex_unlock(&cyapa->state_sync_lock);
+ return size;
+}
+
+static DEVICE_ATTR(firmware_version, S_IRUGO, cyapa_show_fm_ver, NULL);
+static DEVICE_ATTR(product_id, S_IRUGO, cyapa_show_product_id, NULL);
+static DEVICE_ATTR(update_fw, S_IWUSR, NULL, cyapa_update_fw_store);
+static DEVICE_ATTR(baseline, S_IRUGO, cyapa_show_baseline, NULL);
+static DEVICE_ATTR(calibrate, S_IWUSR, NULL, cyapa_calibrate_store);
+static DEVICE_ATTR(mode, S_IRUGO, cyapa_show_mode, NULL);
+
+static struct attribute *cyapa_sysfs_entries[] = {
+ &dev_attr_firmware_version.attr,
+ &dev_attr_product_id.attr,
+ &dev_attr_update_fw.attr,
+ &dev_attr_baseline.attr,
+ &dev_attr_calibrate.attr,
+ &dev_attr_mode.attr,
+ NULL,
+};
+
+static const struct attribute_group cyapa_sysfs_group = {
+ .attrs = cyapa_sysfs_entries,
+};
+
+static void cyapa_remove_sysfs_group(void *data)
+{
+ struct cyapa *cyapa = data;
+
+ sysfs_remove_group(&cyapa->client->dev.kobj, &cyapa_sysfs_group);
+}
+
/*
* Returns:
* 0 Driver and device initialization successfully done.
@@ -773,6 +1027,19 @@ static int cyapa_probe(struct i2c_client *client,
return error;
}

+ error = sysfs_create_group(&client->dev.kobj, &cyapa_sysfs_group);
+ if (error) {
+ dev_err(dev, "failed to create sysfs entries: %d\n", error);
+ return error;
+ }
+
+ error = devm_add_action(dev, cyapa_remove_sysfs_group, cyapa);
+ if (error) {
+ cyapa_remove_sysfs_group(cyapa);
+ dev_err(dev, "failed to add sysfs cleanup action: %d\n", error);
+ return error;
+ }
+
#ifdef CONFIG_PM_SLEEP
if (device_can_wakeup(dev)) {
error = sysfs_merge_group(&client->dev.kobj,
--
1.9.1


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