Add device tree support to matrix keypad driver and usage details
are added to device tree documentation. Also modified the driver
according to recent update of matrix_keypad_build_keymap(), which
automatically allocate memory for keymap.
Signed-off-by: AnilKumar Ch <anilkumar@xxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
This patch was tested on AM335x-EVM and based on linux-next, cleanly
applies on top of "input/next"
Changes from v5:
- Updated based on Dmitry's patch.
* Modified the driver acc. to matrix_keypad_build_keymap()
recent update.
* Combined row_gpios & col_gpios devm_kzalloc's to single
devm_kzalloc.
* Added proper return values for different failures in
matrix_keypad_parse_dt().
Changes from v4:
- Removed clustered-irq support through DT. This should be
added if any platform requires in the future.
Changes from v3:
- Incorporated Stephen Warren's review comments on v3
* Added description to clustered-irq-flags binding
Changes from v2:
- Incorporated Stephen Warren's review comments on v2
* Renamed the bindings file to gpio-matrix-keypad.txt
* Added description to clustered-irq binding
Changes from v1:
- Incorporated Rob's review comments on v1
* Changed matix-keypad compatible to gpio-matrix-keypad
* Removed unnecessary props (num of gpios)
* Used of_match_ptr()
- Removed first patch based on Dmitry's comments on v1
drivers/input/keyboard/matrix_keypad.c | 119 ++++++++++++++++++++++++++------
1 file changed, 97 insertions(+), 22 deletions(-)
diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c
index 18b7237..05d3a96 100644
--- a/drivers/input/keyboard/matrix_keypad.c
+++ b/drivers/input/keyboard/matrix_keypad.c
@@ -23,6 +23,9 @@
#include <linux/gpio.h>
#include <linux/input/matrix_keypad.h>
#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
struct matrix_keypad {
const struct matrix_keypad_platform_data *pdata;
@@ -37,8 +40,6 @@ struct matrix_keypad {
bool scan_pending;
bool stopped;
bool gpio_all_disabled;
-
- unsigned short keycodes[];
};
/*
@@ -118,6 +119,7 @@ static void matrix_keypad_scan(struct work_struct *work)
struct matrix_keypad *keypad =
container_of(work, struct matrix_keypad, work.work);
struct input_dev *input_dev = keypad->input_dev;
+ const unsigned short *keycodes = input_dev->keycode;
const struct matrix_keypad_platform_data *pdata = keypad->pdata;
uint32_t new_state[MATRIX_MAX_COLS];
int row, col, code;
@@ -153,7 +155,7 @@ static void matrix_keypad_scan(struct work_struct *work)
code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
input_event(input_dev, EV_MSC, MSC_SCAN, code);
input_report_key(input_dev,
- keypad->keycodes[code],
+ keycodes[code],
new_state[col] & (1 << row));
}
}
@@ -394,33 +396,95 @@ static void matrix_keypad_free_gpio(struct matrix_keypad *keypad)
gpio_free(pdata->col_gpios[i]);
}
+#ifdef CONFIG_OF
+static struct matrix_keypad_platform_data * __devinit
+matrix_keypad_parse_dt(struct device *dev)
+{
+ struct matrix_keypad_platform_data *pdata;
+ struct device_node *np = dev->of_node;
+ unsigned int *gpios;
+ int i;
+
+ if (!np) {
+ dev_err(dev, "device lacks DT data\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(dev, "could not allocate memory for platform data\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ pdata->num_row_gpios = of_gpio_named_count(np, "row-gpios");
+ pdata->num_col_gpios = of_gpio_named_count(np, "col-gpios");
+ if (!pdata->num_row_gpios || !pdata->num_col_gpios) {
+ dev_err(dev, "number of keypad rows/columns not specified\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (of_get_property(np, "linux,no-autorepeat", NULL))
+ pdata->no_autorepeat = true;
+ if (of_get_property(np, "linux,wakeup", NULL))
+ pdata->wakeup = true;
+ if (of_get_property(np, "gpio-activelow", NULL))
+ pdata->active_low = true;
+
+ of_property_read_u32(np, "debounce-delay-ms", &pdata->debounce_ms);
+ of_property_read_u32(np, "col-scan-delay-us",
+ &pdata->col_scan_delay_us);
+
+ gpios = devm_kzalloc(dev,
+ sizeof(unsigned int) *
+ (pdata->num_row_gpios + pdata->num_col_gpios),
+ GFP_KERNEL);
+ if (!gpios) {
+ dev_err(dev, "could not allocate memory for gpios\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ for (i = 0; i < pdata->num_row_gpios; i++)
+ gpios[i] = of_get_named_gpio(np, "row-gpios", i);
+
+ for (i = 0; i < pdata->num_col_gpios; i++)
+ gpios[pdata->num_row_gpios + i] =
+ of_get_named_gpio(np, "col-gpios", i);
+
+ pdata->row_gpios = gpios;
+ pdata->col_gpios = &gpios[pdata->num_row_gpios];
+
+ return pdata;
+}
+#else
+static inline struct matrix_keypad_platform_data *
+matrix_keypad_parse_dt(struct device *dev)
+{
+ dev_err(dev, "no platform data defined\n");
+
+ return ERR_PTR(-EINVAL);
+}
+#endif
+
static int __devinit matrix_keypad_probe(struct platform_device *pdev)
{
const struct matrix_keypad_platform_data *pdata;
- const struct matrix_keymap_data *keymap_data;
struct matrix_keypad *keypad;
struct input_dev *input_dev;
- unsigned int row_shift;
- size_t keymap_size;
int err;
- pdata = pdev->dev.platform_data;
+ pdata = dev_get_platdata(&pdev->dev);
if (!pdata) {
- dev_err(&pdev->dev, "no platform data defined\n");
- return -EINVAL;
- }
-
- keymap_data = pdata->keymap_data;
- if (!keymap_data) {
+ pdata = matrix_keypad_parse_dt(&pdev->dev);
+ if (IS_ERR(pdata)) {
+ dev_err(&pdev->dev, "no platform data defined\n");
+ return PTR_ERR(pdata);
+ }
+ } else if (!pdata->keymap_data) {
dev_err(&pdev->dev, "no keymap data defined\n");
return -EINVAL;
}
- row_shift = get_count_order(pdata->num_col_gpios);
- keymap_size = (pdata->num_row_gpios << row_shift) *
- sizeof(keypad->keycodes[0]);
- keypad = kzalloc(sizeof(struct matrix_keypad) + keymap_size,
- GFP_KERNEL);
+ keypad = kzalloc(sizeof(struct matrix_keypad), GFP_KERNEL);
input_dev = input_allocate_device();
if (!keypad || !input_dev) {
err = -ENOMEM;
@@ -429,7 +493,7 @@ static int __devinit matrix_keypad_probe(struct platform_device *pdev)
keypad->input_dev = input_dev;
keypad->pdata = pdata;
- keypad->row_shift = row_shift;
+ keypad->row_shift = get_count_order(pdata->num_col_gpios);
keypad->stopped = true;
INIT_DELAYED_WORK(&keypad->work, matrix_keypad_scan);
spin_lock_init(&keypad->lock);
@@ -440,12 +504,14 @@ static int __devinit matrix_keypad_probe(struct platform_device *pdev)
input_dev->open = matrix_keypad_start;
input_dev->close = matrix_keypad_stop;
- err = matrix_keypad_build_keymap(keymap_data, NULL,
+ err = matrix_keypad_build_keymap(pdata->keymap_data, NULL,
pdata->num_row_gpios,
pdata->num_col_gpios,
- keypad->keycodes, input_dev);
- if (err)
+ NULL, input_dev);
+ if (err) {
+ dev_err(&pdev->dev, "failed to build keymap\n");
goto err_free_mem;
+ }
if (!pdata->no_autorepeat)
__set_bit(EV_REP, input_dev->evbit);
@@ -488,6 +554,14 @@ static int __devexit matrix_keypad_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_OF
+static const struct of_device_id matrix_keypad_dt_match[] = {
+ { .compatible = "gpio-matrix-keypad" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, matrix_keypad_dt_match);
+#endif
+
static struct platform_driver matrix_keypad_driver = {
.probe = matrix_keypad_probe,
.remove = __devexit_p(matrix_keypad_remove),
@@ -495,6 +569,7 @@ static struct platform_driver matrix_keypad_driver = {
.name = "matrix-keypad",
.owner = THIS_MODULE,
.pm = &matrix_keypad_pm_ops,
+ .of_match_table = of_match_ptr(matrix_keypad_dt_match),
},
};
module_platform_driver(matrix_keypad_driver);
--
1.7.9.5
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