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@xxxxxx> --- .../devicetree/bindings/input/matrix-keypad.txt | 52 ++++++++++ drivers/input/keyboard/matrix_keypad.c | 104 +++++++++++++++++++- 2 files changed, 155 insertions(+), 1 deletion(-) create mode 100644 Documentation/devicetree/bindings/input/matrix-keypad.txt diff --git a/Documentation/devicetree/bindings/input/matrix-keypad.txt b/Documentation/devicetree/bindings/input/matrix-keypad.txt new file mode 100644 index 0000000..50aaa6e --- /dev/null +++ b/Documentation/devicetree/bindings/input/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 "matix-keypad" +- keypad,num-row-gpios: Number of row lines connected to the keypad + controller. +- keypad,num-col-gpios: Number of column lines connected to the keypad + controller. +- 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. + +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 +- clustered-irq-flags: have clustered irq flags + +Example: + matrix-keypad { + compatible = "matrix-keypad"; + keypad,num-row-gpios = <3>; + keypad,num-col-gpios = <2>; + 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..39e480d 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 +397,91 @@ 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; + 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; + } + + of_property_read_u32(np, "keypad,num-row-gpios", &pdata->num_row_gpios); + of_property_read_u32(np, "keypad,num-col-gpios", &pdata->num_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); + + pdata->row_gpios = devm_kzalloc(dev, sizeof(unsigned int) * + pdata->num_row_gpios, GFP_KERNEL); + pdata->col_gpios = devm_kzalloc(dev, sizeof(unsigned int) * + pdata->num_col_gpios, GFP_KERNEL); + if (!pdata->row_gpios || !pdata->col_gpios) { + dev_err(dev, "could not allocate memory for gpios\n"); + return NULL; + } + + for (row = 0; row < pdata->num_row_gpios; row++) + pdata->row_gpios[row] = of_get_named_gpio(np, "row-gpios", row); + + for (col = 0; col < pdata->num_col_gpios; col++) + pdata->col_gpios[col] = of_get_named_gpio(np, "col-gpios", col); + + 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 +492,10 @@ 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 +579,16 @@ 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 = "matrix-keypad" }, + {}, +}; +MODULE_DEVICE_TABLE(of, matrix_keypad_dt_match); +#else +#define matrix_keypad_dt_match NULL +#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 = matrix_keypad_dt_match, }, }; module_platform_driver(matrix_keypad_driver); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html