[PATCH v5] Input: matrix-keypad - Add device tree support
AnilKumar, Chimata
anilkumar at ti.com
Thu Nov 15 20:38:06 EST 2012
On Thu, Nov 15, 2012 at 13:52:30, Dmitry Torokhov wrote:
> Hi AnilKumar,
>
> On Thu, Nov 15, 2012 at 07:07:33AM +0000, AnilKumar, Chimata wrote:
> > 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?
>
> Actually, could you please try the version below? Note that it needs
> changes to matrix_keypad_build_keymap() found in 'next' branch of my
> tree (to allocate keymap if caller did not supply it).
>
Hi Dmitry,
Thanks for the patch. Minor fix should be required.
>
>
> Input: matrix-keypad - add device tree support
>
> From: AnilKumar Ch <anilkumar at ti.com>
>
> 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>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>
> ---
> .../bindings/input/gpio-matrix-keypad.txt | 46 ++++++++
> drivers/input/keyboard/matrix_keypad.c | 119 ++++++++++++++++----
> 2 files changed, 143 insertions(+), 22 deletions(-)
> 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..ebf6e8f 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) *
We can make above two lines into single.
> + (pdata->num_row_gpios + pdata->num_col_gpios),
> + GFP_KERNEL);
> + if (gpios) {
Above line should be replace with
if (!gpios) {
With this change, I have tested the driver. I will resubmit the patch
with this change.
Thanks
AnilKumar
> + 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);
> --
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