Re: [PATCH V3 2/2] drivers: input: keyboard: add mtk keypad driver

On Tue, Jan 14, 2020 at 1:39 PM fengping.yu [off-list ref] wrote:

kpd_get_keymap_state(keypad->base + KP_MEM1, new_state);

+
+       for (i = 0; i < KPD_NUM_MEMS; i++) {
+               change = new_state[i] ^ keypad->keymap_state[i];
+               if (!change)
+                       continue;
+
+               for_each_set_bit(bit_nr, &change, 32) {
+                       mask = 1 << bit_nr;
+                       pressed = (new_state[i] & mask) == 0U;
+                       dev_dbg(&keypad->input_dev->dev,
+                               "%s", pressed ? "pressed" : "released");
+
+                       code = keycode[MATRIX_SCAN_CODE(i, bit_nr, row_shift)];
+
+                       input_report_key(keypad->input_dev, code, pressed);
+                       input_sync(keypad->input_dev);
+
+                       dev_dbg(&keypad->input_dev->dev,
+                               "report Linux keycode = %d\n", code);
+               }
+       }
+
+       memcpy(keypad->keymap_state, new_state, sizeof(new_state));
+
+       enable_irq(keypad->irqnr);
+
+       return IRQ_HANDLED;
+}
+
+static int kpd_get_dts_info(struct mtk_keypad *keypad)
+{
+       int ret;
+       struct device *dev = keypad->input_dev->dev.parent;
+       struct device_node *node = dev->of_node;
+
+       ret = matrix_keypad_parse_properties(dev, &keypad->n_rows,
+                                            &keypad->n_cols);
+
+       if (ret) {
+               dev_err(dev, "failed to parse keypad params.\n");
+               return ret;
+       }
+
+       ret = of_property_read_u32(node, "mediatek,debounce-us",
+                                  &keypad->key_debounce);
+       if (ret) {
+               pr_debug("read mediatek,debounce-us error.\n");
+               return ret;
+       }
+
+       keypad->wakeup = of_property_read_bool(node, "wakeup-source");
+
+       dev_dbg(dev, "n_row=%d n_col=%d debounce=%d.\n",
+               keypad->n_rows, keypad->n_cols,
+               keypad->key_debounce);
+
+       return 0;
+}
+
+static int kpd_gpio_init(struct device *dev)
+{
+       struct pinctrl *keypad_pinctrl;
+       struct pinctrl_state *kpd_default;
+
+       keypad_pinctrl = devm_pinctrl_get(dev);
+       if (IS_ERR(keypad_pinctrl)) {
+               dev_err(dev, "Cannot find keypad_pinctrl!\n");
+
+               return PTR_ERR(keypad_pinctrl);
+       }
+
+       kpd_default = pinctrl_lookup_state(keypad_pinctrl, "default");
+       if (IS_ERR(kpd_default)) {
+               dev_err(dev, "Cannot find ecall_state!\n");
+
+               return PTR_ERR(kpd_default);
+       }
+
+       return pinctrl_select_state(keypad_pinctrl, kpd_default);
+}
+
+static int kpd_pdrv_probe(struct platform_device *pdev)
+{
+       struct mtk_keypad *keypad;
+       struct resource *res;
+       int err;
+
+       if (!pdev->dev.of_node) {
+               dev_err(&pdev->dev, "No device tree data present.\n");
+               return -EINVAL;
+       }
+
+       keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
+       if (!keypad)
+               return -ENOMEM;
+
+       memset(keypad->keymap_state, 0xff, sizeof(keypad->keymap_state));
+
+       keypad->input_dev = devm_input_allocate_device(&pdev->dev);
+       if (!keypad->input_dev) {
+               dev_err(&pdev->dev, "input allocate device fail.\n");
+               return -ENOMEM;
+       }
+
+       keypad->input_dev->name = KPD_NAME;
+       keypad->input_dev->id.bustype = BUS_HOST;
+       keypad->input_dev->dev.parent = &pdev->dev;
+
+       err = kpd_get_dts_info(keypad);
+       if (err) {
+               dev_err(&pdev->dev, "get dts info failed.\n");
+               return err;
+       }
+
+       err = matrix_keypad_build_keymap(NULL, NULL,
+                                       keypad->n_rows,
+                                       keypad->n_cols,
+                                       NULL,
+                                       keypad->input_dev);
+
+       if (err) {
+               dev_err(&pdev->dev, "build keymap failed.\n");
+               return err;
+       }
+
+       input_set_drvdata(keypad->input_dev, keypad);
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               dev_err(&pdev->dev, "get IO memory resource failed.\n");
+               return -ENODEV;
+       }
+
+       keypad->base = devm_ioremap_resource(&pdev->dev, res);
+       if (IS_ERR(keypad->base)) {
+               dev_err(&pdev->dev, "KP iomap failed\n");
+               return PTR_ERR(keypad->base);
+       }
+
+       writew((keypad->key_debounce * 32 / 1000 & KPD_DEBOUNCE_MASK),
+               keypad->base + KP_DEBOUNCE);
+
+       keypad->clk = devm_clk_get(&pdev->dev, "kpd");
+       if (IS_ERR(keypad->clk)) {
+               dev_err(&pdev->dev, "get kpd-clk fail.\n");
+               return PTR_ERR(keypad->clk);
+       }
+
+       err = clk_prepare_enable(keypad->clk);
+       if (err) {
+               dev_err(&pdev->dev, "kpd-clk prepare enable failed.\n");
+               return err;
+       }
+
+       err = kpd_gpio_init(&pdev->dev);
+       if (err) {
+               dev_err(&pdev->dev, "gpio init failed\n");
+               return err;
+       }
+
+       keypad->irqnr = platform_get_irq(pdev, 0);
+       if (!keypad->irqnr) {
+               dev_err(&pdev->dev, "KP get irqnr failed\n");
+               return -EINVAL;
+       }
+
+       err = devm_request_irq(&pdev->dev, keypad->irqnr,
+                               kpd_irq_handler, 0,
+                               KPD_NAME, keypad);
+       if (err) {
+               dev_err(&pdev->dev, "register IRQ failed.\n");
+               return err;
+       }
+
+       err = input_register_device(keypad->input_dev);
+       if (err) {
+               dev_err(&pdev->dev, "register input device failed.\n");
+               return err;
+       }
+
+       device_init_wakeup(&pdev->dev, keypad->wakeup);
+
+       platform_set_drvdata(pdev, keypad);
+
+       return 0;
+}
+
+static const struct of_device_id kpd_of_match[] = {
+       {.compatible = "mediatek,kp"},
+       {}
+};
+
+static struct platform_driver kpd_pdrv = {
+       .probe = kpd_pdrv_probe,
+       .driver = {
+                  .name = KPD_NAME,
+                  .of_match_table = kpd_of_match,
+       },
+};
+
+module_platform_driver(kpd_pdrv);
+
+MODULE_AUTHOR("Mediatek Corporation");
+MODULE_DESCRIPTION("MTK Keypad (KPD) Driver");
+MODULE_LICENSE("GPL");
--
2.18.0
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