input: ft5x06: create secure touch sysfs files
This patch creates two sysfs files for secure touch - secure_touch and secure_touch_enable which will be accessed by secure ui app. We also define the store and show function for these sysfs files. Change-Id: I4bc156de12a8b41c3640c4f1fb2d32ca3d8b5b43 Signed-off-by: Abinaya P <abinayap@codeaurora.org>
This commit is contained in:
Abinaya P
parent
fb11f3cfe6
commit
93d6b9b0b4
1 changed files with 176 additions and 9 deletions
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@ -208,6 +208,8 @@
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#define PINCTRL_STATE_SUSPEND "pmx_ts_suspend"
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#define PINCTRL_STATE_RELEASE "pmx_ts_release"
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static irqreturn_t ft5x06_ts_interrupt(int irq, void *data);
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enum {
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FT_BLOADER_VERSION_LZ4 = 0,
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FT_BLOADER_VERSION_Z7 = 1,
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@ -246,6 +248,7 @@ struct ft5x06_ts_data {
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struct ft5x06_gesture_platform_data *gesture_pdata;
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struct regulator *vdd;
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struct regulator *vcc_i2c;
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struct mutex ft_clk_io_ctrl_mutex;
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char fw_name[FT_FW_NAME_MAX_LEN];
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bool loading_fw;
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u8 family_id;
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@ -305,7 +308,12 @@ static irqreturn_t ft5x06_filter_interrupt(struct ft5x06_ts_data *data)
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return IRQ_NONE;
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}
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static void ft5x06_secure_touch_stop(struct ft5x06_ts_data *data, int blocking)
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/*
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* 'blocking' variable will have value 'true' when we want to prevent the driver
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* from accessing the xPU/SMMU protected HW resources while the session is
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* active.
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*/
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static void ft5x06_secure_touch_stop(struct ft5x06_ts_data *data, bool blocking)
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{
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if (atomic_read(&data->st_enabled)) {
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atomic_set(&data->st_pending_irqs, -1);
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@ -315,6 +323,125 @@ static void ft5x06_secure_touch_stop(struct ft5x06_ts_data *data, int blocking)
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&data->st_powerdown);
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}
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}
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static int ft5x06_bus_get(struct ft5x06_ts_data *data)
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{
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int retval;
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mutex_lock(&data->ft_clk_io_ctrl_mutex);
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retval = pm_runtime_get_sync(data->client->adapter->dev.parent);
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mutex_unlock(&data->ft_clk_io_ctrl_mutex);
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return retval;
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}
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static void ft5x06_bus_put(struct ft5x06_ts_data *data)
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{
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mutex_lock(&data->ft_clk_io_ctrl_mutex);
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pm_runtime_put_sync(data->client->adapter->dev.parent);
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mutex_unlock(&data->ft_clk_io_ctrl_mutex);
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}
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static ssize_t ft5x06_secure_touch_enable_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ft5x06_ts_data *data = dev_get_drvdata(dev);
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return scnprintf(buf, PAGE_SIZE, "%d", atomic_read(&data->st_enabled));
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}
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/*
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* Accept only "0" and "1" valid values.
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* "0" will reset the st_enabled flag, then wake up the reading process and
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* the interrupt handler.
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* The bus driver is notified via pm_runtime that it is not required to stay
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* awake anymore.
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* It will also make sure the queue of events is emptied in the controller,
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* in case a touch happened in between the secure touch being disabled and
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* the local ISR being ungated.
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* "1" will set the st_enabled flag and clear the st_pending_irqs flag.
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* The bus driver is requested via pm_runtime to stay awake.
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*/
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static ssize_t ft5x06_secure_touch_enable_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct ft5x06_ts_data *data = dev_get_drvdata(dev);
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unsigned long value;
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int err = 0;
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if (count > 2)
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return -EINVAL;
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err = kstrtoul(buf, 10, &value);
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if (err != 0)
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return err;
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err = count;
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switch (value) {
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case 0:
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if (atomic_read(&data->st_enabled) == 0)
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break;
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ft5x06_bus_put(data);
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atomic_set(&data->st_enabled, 0);
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ft5x06_secure_touch_notify(data);
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complete(&data->st_irq_processed);
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ft5x06_ts_interrupt(data->client->irq, data);
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complete(&data->st_powerdown);
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break;
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case 1:
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if (atomic_read(&data->st_enabled)) {
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err = -EBUSY;
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break;
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}
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synchronize_irq(data->client->irq);
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if (ft5x06_bus_get(data) < 0) {
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dev_err(data->client->dev.parent,
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"focalTech_bus_get failed\n");
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err = -EIO;
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break;
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}
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reinit_completion(&data->st_powerdown);
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reinit_completion(&data->st_irq_processed);
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atomic_set(&data->st_enabled, 1);
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atomic_set(&data->st_pending_irqs, 0);
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break;
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default:
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dev_err(data->client->dev.parent,
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"unsupported value: %lu\n", value);
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err = -EINVAL;
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break;
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}
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return err;
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}
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/*
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* This function returns whether there are pending interrupts, or
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* other error conditions that need to be signaled to the userspace library,
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* according tot he following logic:
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* - st_enabled is 0 if secure touch is not enabled, returning -EBADF
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* - st_pending_irqs is -1 to signal that secure touch is in being stopped,
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* returning -EINVAL
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* - st_pending_irqs is 1 to signal that there is a pending irq, returning
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* the value "1" to the sysfs read operation
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* - st_pending_irqs is 0 (only remaining case left) if the pending interrupt
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* has been processed, so the interrupt handler can be allowed to continue.
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*/
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static ssize_t ft5x06_secure_touch_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ft5x06_ts_data *data = dev_get_drvdata(dev);
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int val = 0;
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if (atomic_read(&data->st_enabled) == 0)
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return -EBADF;
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if (atomic_cmpxchg(&data->st_pending_irqs, -1, 0) == -1)
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return -EINVAL;
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if (atomic_cmpxchg(&data->st_pending_irqs, 1, 0) == 1)
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val = 1;
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else
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complete(&data->st_irq_processed);
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return scnprintf(buf, PAGE_SIZE, "%u", val);
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}
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#else
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static void ft5x06_secure_touch_init(struct ft5x06_ts_data *data)
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{
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@ -323,11 +450,21 @@ static irqreturn_t ft5x06_filter_interrupt(struct ft5x06_ts_data *data)
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{
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return IRQ_NONE;
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}
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static void ft5x06_secure_touch_stop(struct ft5x06_ts_data *data, int blocking)
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static void ft5x06_secure_touch_stop(struct ft5x06_ts_data *data, bool blocking)
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{
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}
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#endif
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static struct device_attribute attrs[] = {
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#if defined(CONFIG_FT_SECURE_TOUCH)
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__ATTR(secure_touch_enable, (S_IRUGO | S_IWUSR | S_IWGRP),
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ft5x06_secure_touch_enable_show,
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ft5x06_secure_touch_enable_store),
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__ATTR(secure_touch, S_IRUGO,
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ft5x06_secure_touch_show, NULL),
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#endif
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};
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static inline bool ft5x06_gesture_support_enabled(void)
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{
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return config_enabled(CONFIG_TOUCHSCREEN_FT5X06_GESTURE);
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@ -1125,7 +1262,7 @@ static int ft5x06_ts_suspend(struct device *dev)
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return 0;
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}
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ft5x06_secure_touch_stop(data, 1);
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ft5x06_secure_touch_stop(data, true);
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if (ft5x06_gesture_support_enabled() && data->pdata->gesture_support &&
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device_may_wakeup(dev) &&
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@ -1153,7 +1290,7 @@ static int ft5x06_ts_resume(struct device *dev)
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return 0;
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}
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ft5x06_secure_touch_stop(data, 1);
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ft5x06_secure_touch_stop(data, true);
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if (ft5x06_gesture_support_enabled() && data->pdata->gesture_support &&
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device_may_wakeup(dev) &&
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@ -1257,7 +1394,13 @@ static void ft5x06_ts_early_suspend(struct early_suspend *handler)
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struct ft5x06_ts_data,
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early_suspend);
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ft5x06_secure_touch_stop(data, 0);
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/*
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* During early suspend/late resume, the driver doesn't access xPU/SMMU
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* protected HW resources. So, there is no compelling need to block,
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* but notifying the userspace that a power event has occurred is
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* enough. Hence 'blocking' variable can be set to false.
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*/
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ft5x06_secure_touch_stop(data, false);
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ft5x06_ts_suspend(&data->client->dev);
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}
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@ -1267,7 +1410,7 @@ static void ft5x06_ts_late_resume(struct early_suspend *handler)
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struct ft5x06_ts_data,
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early_suspend);
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ft5x06_secure_touch_stop(data, 0);
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ft5x06_secure_touch_stop(data, false);
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ft5x06_ts_resume(&data->client->dev);
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}
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#endif
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@ -2058,7 +2201,8 @@ static int ft5x06_ts_probe(struct i2c_client *client,
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struct dentry *temp;
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u8 reg_value;
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u8 reg_addr;
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int err, len;
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int err, len, retval, attr_count;
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if (client->dev.of_node) {
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pdata = devm_kzalloc(&client->dev,
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sizeof(struct ft5x06_ts_platform_data), GFP_KERNEL);
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@ -2360,7 +2504,20 @@ static int ft5x06_ts_probe(struct i2c_client *client,
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/*Initialize secure touch */
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ft5x06_secure_touch_init(data);
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ft5x06_secure_touch_stop(data, 1);
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ft5x06_secure_touch_stop(data, true);
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mutex_init(&(data->ft_clk_io_ctrl_mutex));
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/* Creation of secure touch sysfs files */
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for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
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retval = sysfs_create_file(&data->input_dev->dev.kobj,
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&attrs[attr_count].attr);
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if (retval < 0) {
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dev_err(&client->dev,
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"%s: Failed to create sysfs attributes\n",
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__func__);
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goto free_secure_touch_sysfs;
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}
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}
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ft5x06_update_fw_ver(data);
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ft5x06_update_fw_vendor_id(data);
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@ -2389,6 +2546,11 @@ static int ft5x06_ts_probe(struct i2c_client *client,
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#endif
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return 0;
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free_secure_touch_sysfs:
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for (attr_count--; attr_count >= 0; attr_count--) {
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sysfs_remove_file(&data->input_dev->dev.kobj,
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&attrs[attr_count].attr);
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}
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free_debug_dir:
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debugfs_remove_recursive(data->dir);
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free_force_update_fw_sys:
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@ -2449,7 +2611,7 @@ unreg_inputdev:
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static int ft5x06_ts_remove(struct i2c_client *client)
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{
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struct ft5x06_ts_data *data = i2c_get_clientdata(client);
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int retval;
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int retval, attr_count;
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if (ft5x06_gesture_support_enabled() && data->pdata->gesture_support) {
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device_init_wakeup(&client->dev, 0);
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@ -2492,6 +2654,11 @@ static int ft5x06_ts_remove(struct i2c_client *client)
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}
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}
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for (attr_count = 0; attr_count < ARRAY_SIZE(attrs); attr_count++) {
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sysfs_remove_file(&data->input_dev->dev.kobj,
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&attrs[attr_count].attr);
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}
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if (data->pdata->power_on)
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data->pdata->power_on(false);
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else
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