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path: root/drivers/input/keyboard/tegra-kbc.c
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Diffstat (limited to 'drivers/input/keyboard/tegra-kbc.c')
-rw-r--r--drivers/input/keyboard/tegra-kbc.c85
1 files changed, 53 insertions, 32 deletions
diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index a5a77915c650..cf3228b0ab90 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -55,6 +55,7 @@
#define KBC_ROW_CFG0_0 0x8
#define KBC_COL_CFG0_0 0x18
+#define KBC_TO_CNT_0 0x24
#define KBC_INIT_DLY_0 0x28
#define KBC_RPT_DLY_0 0x2c
#define KBC_KP_ENT0_0 0x30
@@ -70,6 +71,7 @@ struct tegra_kbc {
spinlock_t lock;
unsigned int repoll_dly;
unsigned long cp_dly_jiffies;
+ unsigned int cp_to_wkup_dly;
bool use_fn_map;
bool use_ghost_filter;
const struct tegra_kbc_platform_data *pdata;
@@ -258,12 +260,10 @@ static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
u32 val = 0;
unsigned int i;
unsigned int num_down = 0;
- unsigned long flags;
bool fn_keypress = false;
bool key_in_same_row = false;
bool key_in_same_col = false;
- spin_lock_irqsave(&kbc->lock, flags);
for (i = 0; i < KBC_MAX_KPENT; i++) {
if ((i % 4) == 0)
val = readl(kbc->mmio + KBC_KP_ENT0_0 + i);
@@ -292,7 +292,7 @@ static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
* any 2 of the 3 keys share a row, and any 2 of them share a column.
* If so ignore the key presses for this iteration.
*/
- if ((kbc->use_ghost_filter) && (num_down >= 3)) {
+ if (kbc->use_ghost_filter && num_down >= 3) {
for (i = 0; i < num_down; i++) {
unsigned int j;
u8 curr_col = scancodes[i] & 0x07;
@@ -325,8 +325,6 @@ static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
}
}
- spin_unlock_irqrestore(&kbc->lock, flags);
-
/* Ignore the key presses for this iteration? */
if (key_in_same_col && key_in_same_row)
return;
@@ -341,6 +339,18 @@ static void tegra_kbc_report_keys(struct tegra_kbc *kbc)
kbc->num_pressed_keys = num_down;
}
+static void tegra_kbc_set_fifo_interrupt(struct tegra_kbc *kbc, bool enable)
+{
+ u32 val;
+
+ val = readl(kbc->mmio + KBC_CONTROL_0);
+ if (enable)
+ val |= KBC_CONTROL_FIFO_CNT_INT_EN;
+ else
+ val &= ~KBC_CONTROL_FIFO_CNT_INT_EN;
+ writel(val, kbc->mmio + KBC_CONTROL_0);
+}
+
static void tegra_kbc_keypress_timer(unsigned long data)
{
struct tegra_kbc *kbc = (struct tegra_kbc *)data;
@@ -348,6 +358,8 @@ static void tegra_kbc_keypress_timer(unsigned long data)
u32 val;
unsigned int i;
+ spin_lock_irqsave(&kbc->lock, flags);
+
val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf;
if (val) {
unsigned long dly;
@@ -369,26 +381,19 @@ static void tegra_kbc_keypress_timer(unsigned long data)
kbc->num_pressed_keys = 0;
/* All keys are released so enable the keypress interrupt */
- spin_lock_irqsave(&kbc->lock, flags);
- val = readl(kbc->mmio + KBC_CONTROL_0);
- val |= KBC_CONTROL_FIFO_CNT_INT_EN;
- writel(val, kbc->mmio + KBC_CONTROL_0);
- spin_unlock_irqrestore(&kbc->lock, flags);
+ tegra_kbc_set_fifo_interrupt(kbc, true);
}
+
+ spin_unlock_irqrestore(&kbc->lock, flags);
}
static irqreturn_t tegra_kbc_isr(int irq, void *args)
{
struct tegra_kbc *kbc = args;
- u32 val, ctl;
+ unsigned long flags;
+ u32 val;
- /*
- * Until all keys are released, defer further processing to
- * the polling loop in tegra_kbc_keypress_timer
- */
- ctl = readl(kbc->mmio + KBC_CONTROL_0);
- ctl &= ~KBC_CONTROL_FIFO_CNT_INT_EN;
- writel(ctl, kbc->mmio + KBC_CONTROL_0);
+ spin_lock_irqsave(&kbc->lock, flags);
/*
* Quickly bail out & reenable interrupts if the fifo threshold
@@ -399,15 +404,15 @@ static irqreturn_t tegra_kbc_isr(int irq, void *args)
if (val & KBC_INT_FIFO_CNT_INT_STATUS) {
/*
- * Schedule timer to run when hardware is in continuous
- * polling mode.
+ * Until all keys are released, defer further processing to
+ * the polling loop in tegra_kbc_keypress_timer.
*/
+ tegra_kbc_set_fifo_interrupt(kbc, false);
mod_timer(&kbc->timer, jiffies + kbc->cp_dly_jiffies);
- } else {
- ctl |= KBC_CONTROL_FIFO_CNT_INT_EN;
- writel(ctl, kbc->mmio + KBC_CONTROL_0);
}
+ spin_unlock_irqrestore(&kbc->lock, flags);
+
return IRQ_HANDLED;
}
@@ -455,7 +460,6 @@ static void tegra_kbc_config_pins(struct tegra_kbc *kbc)
static int tegra_kbc_start(struct tegra_kbc *kbc)
{
const struct tegra_kbc_platform_data *pdata = kbc->pdata;
- unsigned long flags;
unsigned int debounce_cnt;
u32 val = 0;
@@ -493,7 +497,6 @@ static int tegra_kbc_start(struct tegra_kbc *kbc)
* Atomically clear out any remaining entries in the key FIFO
* and enable keyboard interrupts.
*/
- spin_lock_irqsave(&kbc->lock, flags);
while (1) {
val = readl(kbc->mmio + KBC_INT_0);
val >>= 4;
@@ -504,7 +507,6 @@ static int tegra_kbc_start(struct tegra_kbc *kbc)
val = readl(kbc->mmio + KBC_KP_ENT1_0);
}
writel(0x7, kbc->mmio + KBC_INT_0);
- spin_unlock_irqrestore(&kbc->lock, flags);
enable_irq(kbc->irq);
@@ -734,18 +736,30 @@ static int tegra_kbc_suspend(struct device *dev)
struct platform_device *pdev = to_platform_device(dev);
struct tegra_kbc *kbc = platform_get_drvdata(pdev);
+ mutex_lock(&kbc->idev->mutex);
if (device_may_wakeup(&pdev->dev)) {
- tegra_kbc_setup_wakekeys(kbc, true);
- enable_irq_wake(kbc->irq);
+ disable_irq(kbc->irq);
+ del_timer_sync(&kbc->timer);
+ tegra_kbc_set_fifo_interrupt(kbc, false);
+
/* Forcefully clear the interrupt status */
writel(0x7, kbc->mmio + KBC_INT_0);
+ /*
+ * Store the previous resident time of continuous polling mode.
+ * Force the keyboard into interrupt mode.
+ */
+ kbc->cp_to_wkup_dly = readl(kbc->mmio + KBC_TO_CNT_0);
+ writel(0, kbc->mmio + KBC_TO_CNT_0);
+
+ tegra_kbc_setup_wakekeys(kbc, true);
msleep(30);
+
+ enable_irq_wake(kbc->irq);
} else {
- mutex_lock(&kbc->idev->mutex);
if (kbc->idev->users)
tegra_kbc_stop(kbc);
- mutex_unlock(&kbc->idev->mutex);
}
+ mutex_unlock(&kbc->idev->mutex);
return 0;
}
@@ -756,15 +770,22 @@ static int tegra_kbc_resume(struct device *dev)
struct tegra_kbc *kbc = platform_get_drvdata(pdev);
int err = 0;
+ mutex_lock(&kbc->idev->mutex);
if (device_may_wakeup(&pdev->dev)) {
disable_irq_wake(kbc->irq);
tegra_kbc_setup_wakekeys(kbc, false);
+
+ /* Restore the resident time of continuous polling mode. */
+ writel(kbc->cp_to_wkup_dly, kbc->mmio + KBC_TO_CNT_0);
+
+ tegra_kbc_set_fifo_interrupt(kbc, true);
+
+ enable_irq(kbc->irq);
} else {
- mutex_lock(&kbc->idev->mutex);
if (kbc->idev->users)
err = tegra_kbc_start(kbc);
- mutex_unlock(&kbc->idev->mutex);
}
+ mutex_unlock(&kbc->idev->mutex);
return err;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 23:52:42 +0100