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path: root/drivers/input/keyboard/nspire-keypad.c
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Diffstat (limited to 'drivers/input/keyboard/nspire-keypad.c')
-rw-r--r--drivers/input/keyboard/nspire-keypad.c56
1 files changed, 31 insertions, 25 deletions
diff --git a/drivers/input/keyboard/nspire-keypad.c b/drivers/input/keyboard/nspire-keypad.c
index 63d5e488137d..e9fa1423f136 100644
--- a/drivers/input/keyboard/nspire-keypad.c
+++ b/drivers/input/keyboard/nspire-keypad.c
@@ -93,9 +93,15 @@ static irqreturn_t nspire_keypad_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int nspire_keypad_chip_init(struct nspire_keypad *keypad)
+static int nspire_keypad_open(struct input_dev *input)
{
+ struct nspire_keypad *keypad = input_get_drvdata(input);
unsigned long val = 0, cycles_per_us, delay_cycles, row_delay_cycles;
+ int error;
+
+ error = clk_prepare_enable(keypad->clk);
+ if (error)
+ return error;
cycles_per_us = (clk_get_rate(keypad->clk) / 1000000);
if (cycles_per_us == 0)
@@ -121,30 +127,6 @@ static int nspire_keypad_chip_init(struct nspire_keypad *keypad)
keypad->int_mask = 1 << 1;
writel(keypad->int_mask, keypad->reg_base + KEYPAD_INTMSK);
- /* Disable GPIO interrupts to prevent hanging on touchpad */
- /* Possibly used to detect touchpad events */
- writel(0, keypad->reg_base + KEYPAD_UNKNOWN_INT);
- /* Acknowledge existing interrupts */
- writel(~0, keypad->reg_base + KEYPAD_UNKNOWN_INT_STS);
-
- return 0;
-}
-
-static int nspire_keypad_open(struct input_dev *input)
-{
- struct nspire_keypad *keypad = input_get_drvdata(input);
- int error;
-
- error = clk_prepare_enable(keypad->clk);
- if (error)
- return error;
-
- error = nspire_keypad_chip_init(keypad);
- if (error) {
- clk_disable_unprepare(keypad->clk);
- return error;
- }
-
return 0;
}
@@ -152,6 +134,11 @@ static void nspire_keypad_close(struct input_dev *input)
{
struct nspire_keypad *keypad = input_get_drvdata(input);
+ /* Disable interrupts */
+ writel(0, keypad->reg_base + KEYPAD_INTMSK);
+ /* Acknowledge existing interrupts */
+ writel(~0, keypad->reg_base + KEYPAD_INT);
+
clk_disable_unprepare(keypad->clk);
}
@@ -210,6 +197,25 @@ static int nspire_keypad_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ error = clk_prepare_enable(keypad->clk);
+ if (error) {
+ dev_err(&pdev->dev, "failed to enable clock\n");
+ return error;
+ }
+
+ /* Disable interrupts */
+ writel(0, keypad->reg_base + KEYPAD_INTMSK);
+ /* Acknowledge existing interrupts */
+ writel(~0, keypad->reg_base + KEYPAD_INT);
+
+ /* Disable GPIO interrupts to prevent hanging on touchpad */
+ /* Possibly used to detect touchpad events */
+ writel(0, keypad->reg_base + KEYPAD_UNKNOWN_INT);
+ /* Acknowledge existing GPIO interrupts */
+ writel(~0, keypad->reg_base + KEYPAD_UNKNOWN_INT_STS);
+
+ clk_disable_unprepare(keypad->clk);
+
input_set_drvdata(input, keypad);
input->id.bustype = BUS_HOST;