[PATCH v4] Input: matrix-keypad - Add device tree support
AnilKumar, Chimata
anilkumar at ti.com
Wed Nov 7 20:38:38 EST 2012
On Wed, Nov 07, 2012 at 15:02:05, AnilKumar, Chimata wrote:
> Add device tree support to matrix keypad driver and usage details
> are added to device tree documentation. Driver was tested on AM335x
> EVM.
+Stephen
ACK from the reviewers (Rob Herring and Stephen Warren) of earlier
versions will help to get this in.
Thanks
AnilKumar
>
> Signed-off-by: AnilKumar Ch <anilkumar at ti.com>
> ---
> This patch was tested on AM335x-EVM and based on linux-next, cleanly
> applies on top of input/next
>
> 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
>
> .../bindings/input/gpio-matrix-keypad.txt | 52 ++++++++++
> drivers/input/keyboard/matrix_keypad.c | 107 +++++++++++++++++++-
> 2 files changed, 158 insertions(+), 1 deletion(-)
> create mode 100644 Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
>
> diff --git a/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
> new file mode 100644
> index 0000000..1acdfc4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
> @@ -0,0 +1,52 @@
> +* GPIO driven matrix keypad device tree bindings
> +
> +GPIO driven matrix keypad is used to interface a SoC with a matrix keypad.
> +The matrix keypad supports multiple row and column lines, a key can be
> +placed at each intersection of a unique row and a unique column. The matrix
> +keypad can sense a key-press and key-release by means of GPIO lines and
> +report the event using GPIO interrupts to the cpu.
> +
> +Required Properties:
> +- compatible: Should be "gpio-matrix-keypad"
> +- row-gpios: List of gpios used as row lines. The gpio specifier
> + for this property depends on the gpio controller to
> + which these row lines are connected.
> +- col-gpios: List of gpios used as column lines. The gpio specifier
> + for this property depends on the gpio controller to
> + which these column lines are connected.
> +- linux,keymap: The definition can be found at
> + bindings/input/matrix-keymap.txt
> +
> +Optional Properties:
> +- linux,no-autorepeat: do no enable autorepeat feature.
> +- linux,wakeup: use any event on keypad as wakeup event.
> +- debounce-delay-ms: debounce interval in milliseconds
> +- col-scan-delay-us: delay, measured in microseconds, that is needed
> + before we can scan keypad after activating column gpio
> +- clustered-irq: have clustered irq number, that is needed if the irq
> + is a combined irq source for the whole matrix keypad.
> + This is useful if rows and columns of the keypad are
> + connected to a GPIO expander.
> +- clustered-irq-flags: clustered irq flags to specify the interrupt line
> + behaviour among IRQF_TRIGGER_*
> +
> +Example:
> + matrix-keypad {
> + compatible = "gpio-matrix-keypad";
> + debounce-delay-ms = <5>;
> + col-scan-delay-us = <2>;
> +
> + row-gpios = <&gpio2 25 0
> + &gpio2 26 0
> + &gpio2 27 0>;
> +
> + col-gpios = <&gpio2 21 0
> + &gpio2 22 0>;
> +
> + linux,keymap = <0x0000008B
> + 0x0100009E
> + 0x02000069
> + 0x0001006A
> + 0x0101001C
> + 0x0201006C>;
> + };
> diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c
> index 18b7237..960e9b05 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;
> @@ -394,6 +397,96 @@ 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 *matrix_keypad_parse_dt(struct device *dev)
> +{
> + struct matrix_keypad_platform_data *pdata;
> + struct matrix_keymap_data *keymap_data;
> + struct device_node *np = dev->of_node;
> + unsigned int *row_gpios;
> + unsigned int *col_gpios;
> + struct property *prop;
> + int key_count = 0, length, row, col;
> + uint32_t *keymap;
> +
> + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata) {
> + dev_err(dev, "could not allocate memory for platform data\n");
> + return NULL;
> + }
> +
> + 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 NULL;
> + }
> +
> + keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
> + if (!keymap_data) {
> + dev_err(dev, "could not allocate memory for keymap data\n");
> + return NULL;
> + }
> + pdata->keymap_data = keymap_data;
> +
> + prop = of_find_property(np, "linux,keymap", &length);
> + if (!prop)
> + return NULL;
> +
> + key_count = length / sizeof(u32);
> + keymap_data->keymap_size = key_count;
> + keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
> + if (!keymap) {
> + dev_err(dev, "could not allocate memory for keymap\n");
> + return NULL;
> + }
> + keymap_data->keymap = keymap;
> +
> + of_property_read_u32_array(np, "linux,keymap", keymap, key_count);
> +
> + 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);
> + of_property_read_u32(np, "clustered-irq", &pdata->clustered_irq);
> + of_property_read_u32(np, "clustered-irq-flags",
> + &pdata->clustered_irq_flags);
> +
> + row_gpios = devm_kzalloc(dev, sizeof(unsigned int) *
> + pdata->num_row_gpios, GFP_KERNEL);
> + col_gpios = devm_kzalloc(dev, sizeof(unsigned int) *
> + pdata->num_col_gpios, GFP_KERNEL);
> + if (!row_gpios || !col_gpios) {
> + dev_err(dev, "could not allocate memory for gpios\n");
> + return NULL;
> + }
> +
> + for (row = 0; row < pdata->num_row_gpios; row++)
> + row_gpios[row] = of_get_named_gpio(np, "row-gpios", row);
> +
> + for (col = 0; col < pdata->num_col_gpios; col++)
> + col_gpios[col] = of_get_named_gpio(np, "col-gpios", col);
> +
> + pdata->row_gpios = row_gpios;
> + pdata->col_gpios = col_gpios;
> +
> + return pdata;
> +}
> +#else
> +static
> +struct matrix_keypad_platform_data *matrix_keypad_parse_dt(struct device *dev)
> +{
> + return NULL;
> +}
> +#endif
> +
> static int __devinit matrix_keypad_probe(struct platform_device *pdev)
> {
> const struct matrix_keypad_platform_data *pdata;
> @@ -404,7 +497,10 @@ static int __devinit matrix_keypad_probe(struct platform_device *pdev)
> size_t keymap_size;
> int err;
>
> - pdata = pdev->dev.platform_data;
> + if (pdev->dev.of_node)
> + pdata = matrix_keypad_parse_dt(&pdev->dev);
> + else
> + pdata = pdev->dev.platform_data;
> if (!pdata) {
> dev_err(&pdev->dev, "no platform data defined\n");
> return -EINVAL;
> @@ -488,6 +584,14 @@ 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 +599,7 @@ 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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