Input: cros_ec_keyb - handle x86 detachable/convertible Chromebooks

[platform/kernel/linux-starfive.git] / drivers / input / keyboard / cros_ec_keyb.c

diff --git a/drivers/input/keyboard/cros_ec_keyb.c b/drivers/input/keyboard/cros_ec_keyb.c
index cc73a14..c14136b 100644 (file)
--- a/drivers/input/keyboard/cros_ec_keyb.c
+++ b/drivers/input/keyboard/cros_ec_keyb.c
@@ -12,6 +12,7 @@
 // expensive.
 
 #include <linux/module.h>
+#include <linux/acpi.h>
 #include <linux/bitops.h>
 #include <linux/i2c.h>
 #include <linux/input.h>
@@ -518,6 +519,50 @@ static int cros_ec_keyb_register_bs(struct cros_ec_keyb *ckdev,
        return 0;
 }
 
+static void cros_ec_keyb_parse_vivaldi_physmap(struct cros_ec_keyb *ckdev)
+{
+       u32 *physmap = ckdev->vdata.function_row_physmap;
+       unsigned int row, col, scancode;
+       int n_physmap;
+       int error;
+       int i;
+
+       n_physmap = device_property_count_u32(ckdev->dev,
+                                             "function-row-physmap");
+       if (n_physmap <= 0)
+               return;
+
+       if (n_physmap >= VIVALDI_MAX_FUNCTION_ROW_KEYS) {
+               dev_warn(ckdev->dev,
+                        "only up to %d top row keys is supported (%d specified)\n",
+                        VIVALDI_MAX_FUNCTION_ROW_KEYS, n_physmap);
+               n_physmap = VIVALDI_MAX_FUNCTION_ROW_KEYS;
+       }
+
+       error = device_property_read_u32_array(ckdev->dev,
+                                              "function-row-physmap",
+                                              physmap, n_physmap);
+       if (error) {
+               dev_warn(ckdev->dev,
+                        "failed to parse function-row-physmap property: %d\n",
+                        error);
+               return;
+       }
+
+       /*
+        * Convert (in place) from row/column encoding to matrix "scancode"
+        * used by the driver.
+        */
+       for (i = 0; i < n_physmap; i++) {
+               row = KEY_ROW(physmap[i]);
+               col = KEY_COL(physmap[i]);
+               scancode = MATRIX_SCAN_CODE(row, col, ckdev->row_shift);
+               physmap[i] = scancode;
+       }
+
+       ckdev->vdata.num_function_row_keys = n_physmap;
+}
+
 /**
  * cros_ec_keyb_register_matrix - Register matrix keys
  *
@@ -534,11 +579,6 @@ static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev)
        struct input_dev *idev;
        const char *phys;
        int err;
-       struct property *prop;
-       const __be32 *p;
-       u32 *physmap;
-       u32 key_pos;
-       unsigned int row, col, scancode, n_physmap;
 
        err = matrix_keypad_parse_properties(dev, &ckdev->rows, &ckdev->cols);
        if (err)
@@ -573,7 +613,7 @@ static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev)
        idev->id.product = 0;
        idev->dev.parent = dev;
 
-       ckdev->ghost_filter = of_property_read_bool(dev->of_node,
+       ckdev->ghost_filter = device_property_read_bool(dev,
                                        "google,needs-ghost-filter");
 
        err = matrix_keypad_build_keymap(NULL, NULL, ckdev->rows, ckdev->cols,
@@ -589,22 +629,7 @@ static int cros_ec_keyb_register_matrix(struct cros_ec_keyb *ckdev)
        input_set_drvdata(idev, ckdev);
        ckdev->idev = idev;
        cros_ec_keyb_compute_valid_keys(ckdev);
-
-       physmap = ckdev->vdata.function_row_physmap;
-       n_physmap = 0;
-       of_property_for_each_u32(dev->of_node, "function-row-physmap",
-                                prop, p, key_pos) {
-               if (n_physmap == VIVALDI_MAX_FUNCTION_ROW_KEYS) {
-                       dev_warn(dev, "Only support up to %d top row keys\n",
-                                VIVALDI_MAX_FUNCTION_ROW_KEYS);
-                       break;
-               }
-               row = KEY_ROW(key_pos);
-               col = KEY_COL(key_pos);
-               scancode = MATRIX_SCAN_CODE(row, col, ckdev->row_shift);
-               physmap[n_physmap++] = scancode;
-       }
-       ckdev->vdata.num_function_row_keys = n_physmap;
+       cros_ec_keyb_parse_vivaldi_physmap(ckdev);
 
        err = input_register_device(ckdev->idev);
        if (err) {
@@ -653,14 +678,19 @@ static const struct attribute_group cros_ec_keyb_attr_group = {
 
 static int cros_ec_keyb_probe(struct platform_device *pdev)
 {
-       struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
+       struct cros_ec_device *ec;
        struct device *dev = &pdev->dev;
        struct cros_ec_keyb *ckdev;
        bool buttons_switches_only = device_get_match_data(dev);
        int err;
 
-       if (!dev->of_node)
-               return -ENODEV;
+       /*
+        * If the parent ec device has not been probed yet, defer the probe of
+        * this keyboard/button driver until later.
+        */
+       ec = dev_get_drvdata(pdev->dev.parent);
+       if (!ec)
+               return -EPROBE_DEFER;
 
        ckdev = devm_kzalloc(dev, sizeof(*ckdev), GFP_KERNEL);
        if (!ckdev)
@@ -713,6 +743,14 @@ static int cros_ec_keyb_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id cros_ec_keyb_acpi_match[] = {
+       { "GOOG0007", true },
+       { }
+};
+MODULE_DEVICE_TABLE(acpi, cros_ec_keyb_acpi_match);
+#endif
+
 #ifdef CONFIG_OF
 static const struct of_device_id cros_ec_keyb_of_match[] = {
        { .compatible = "google,cros-ec-keyb" },
@@ -730,6 +768,7 @@ static struct platform_driver cros_ec_keyb_driver = {
        .driver = {
                .name = "cros-ec-keyb",
                .of_match_table = of_match_ptr(cros_ec_keyb_of_match),
+               .acpi_match_table = ACPI_PTR(cros_ec_keyb_acpi_match),
                .pm = &cros_ec_keyb_pm_ops,
        },
 };