[PATCH v5] Input: matrix-keypad - Add device tree support
AnilKumar, Chimata
anilkumar at ti.com
Thu Nov 15 18:07:33 EST 2012
On Sun, Nov 11, 2012 at 08:05:18, Rob Herring wrote:
> On 11/10/2012 03:40 PM, AnilKumar Ch wrote:
> > Add device tree support to matrix keypad driver and usage details
> > are added to device tree documentation. Driver was tested on AM335x
> > EVM.
> >
> > Signed-off-by: AnilKumar Ch <anilkumar at ti.com>
>
> Acked-by: Rob Herring <rob.herring at calxeda.com>
Hi Dmitry,
If there are no further comments on this patch, could you please
take this in?
Thanks
AnilKumar
>
> > ---
> > This patch was tested on AM335x-EVM and based on linux-next, cleanly
> > applies on top of "input/next"
> >
> > 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
> >
> > .../bindings/input/gpio-matrix-keypad.txt | 46 +++++++++
> > drivers/input/keyboard/matrix_keypad.c | 104 +++++++++++++++++++-
> > 2 files changed, 149 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..ead641c
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/input/gpio-matrix-keypad.txt
> > @@ -0,0 +1,46 @@
> > +* 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
> > +
> > +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..3ba8cfb 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 +397,93 @@ 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);
> > +
> > + 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 +494,10 @@ 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 +581,14 @@ 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 +596,7 @@ 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);
> >
>
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