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-rw-r--r--drivers/input/keyboard/sun4i-lradc-keys.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/input/keyboard/sun4i-lradc-keys.c b/drivers/input/keyboard/sun4i-lradc-keys.c
index 15aa81942a10..e52505667df3 100644
--- a/drivers/input/keyboard/sun4i-lradc-keys.c
+++ b/drivers/input/keyboard/sun4i-lradc-keys.c
@@ -14,6 +14,7 @@
* there are no boards known to use channel 1.
*/
+#include <linux/clk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/input.h>
@@ -25,6 +26,7 @@
#include <linux/pm_wakeirq.h>
#include <linux/pm_wakeup.h>
#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
#include <linux/slab.h>
#define LRADC_CTRL 0x00
@@ -60,10 +62,12 @@
/* struct lradc_variant - Describe sun4i-a10-lradc-keys hardware variant
* @divisor_numerator: The numerator of lradc Vref internally divisor
* @divisor_denominator: The denominator of lradc Vref internally divisor
+ * @has_clock_reset: If the binding requires a clock and reset
*/
struct lradc_variant {
u8 divisor_numerator;
u8 divisor_denominator;
+ bool has_clock_reset;
};
static const struct lradc_variant lradc_variant_a10 = {
@@ -85,6 +89,8 @@ struct sun4i_lradc_data {
struct device *dev;
struct input_dev *input;
void __iomem *base;
+ struct clk *clk;
+ struct reset_control *reset;
struct regulator *vref_supply;
struct sun4i_lradc_keymap *chan0_map;
const struct lradc_variant *variant;
@@ -142,6 +148,14 @@ static int sun4i_lradc_open(struct input_dev *dev)
if (error)
return error;
+ error = reset_control_deassert(lradc->reset);
+ if (error)
+ goto err_disable_reg;
+
+ error = clk_prepare_enable(lradc->clk);
+ if (error)
+ goto err_assert_reset;
+
lradc->vref = regulator_get_voltage(lradc->vref_supply) *
lradc->variant->divisor_numerator /
lradc->variant->divisor_denominator;
@@ -155,6 +169,13 @@ static int sun4i_lradc_open(struct input_dev *dev)
writel(CHAN0_KEYUP_IRQ | CHAN0_KEYDOWN_IRQ, lradc->base + LRADC_INTC);
return 0;
+
+err_assert_reset:
+ reset_control_assert(lradc->reset);
+err_disable_reg:
+ regulator_disable(lradc->vref_supply);
+
+ return error;
}
static void sun4i_lradc_close(struct input_dev *dev)
@@ -166,6 +187,8 @@ static void sun4i_lradc_close(struct input_dev *dev)
SAMPLE_RATE(2), lradc->base + LRADC_CTRL);
writel(0, lradc->base + LRADC_INTC);
+ clk_disable_unprepare(lradc->clk);
+ reset_control_assert(lradc->reset);
regulator_disable(lradc->vref_supply);
}
@@ -244,6 +267,16 @@ static int sun4i_lradc_probe(struct platform_device *pdev)
return -EINVAL;
}
+ if (lradc->variant->has_clock_reset) {
+ lradc->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(lradc->clk))
+ return PTR_ERR(lradc->clk);
+
+ lradc->reset = devm_reset_control_get_exclusive(dev, NULL);
+ if (IS_ERR(lradc->reset))
+ return PTR_ERR(lradc->reset);
+ }
+
lradc->vref_supply = devm_regulator_get(dev, "vref");
if (IS_ERR(lradc->vref_supply))
return PTR_ERR(lradc->vref_supply);