mfd: cros_ec_dev: Register cros_ec_accel_legacy driver as a subdevice

With this patch, the cros_ec_ctl driver will register the legacy
accelerometer driver (named cros_ec_accel_legacy) if it fails to
register sensors through the usual path cros_ec_sensors_register().
This legacy device is present on Chromebook devices with older EC
firmware only supporting deprecated EC commands:
- Glimmer based devices [Intel SOC using LPC transport]
- Veyron minnie devices [ARM SOC using SPI transport]

Tested-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/cros_ec_dev.c b/drivers/mfd/cros_ec_dev.c
index a47223d..eb77bf6 100644 (file)
--- a/drivers/mfd/cros_ec_dev.c
+++ b/drivers/mfd/cros_ec_dev.c
@@ -383,6 +383,72 @@ error:
        kfree(msg);
 }
 
+static struct cros_ec_sensor_platform sensor_platforms[] = {
+       { .sensor_num = 0 },
+       { .sensor_num = 1 }
+};
+
+static const struct mfd_cell cros_ec_accel_legacy_cells[] = {
+       {
+               .name = "cros-ec-accel-legacy",
+               .platform_data = &sensor_platforms[0],
+               .pdata_size = sizeof(struct cros_ec_sensor_platform),
+       },
+       {
+               .name = "cros-ec-accel-legacy",
+               .platform_data = &sensor_platforms[1],
+               .pdata_size = sizeof(struct cros_ec_sensor_platform),
+       }
+};
+
+static void cros_ec_accel_legacy_register(struct cros_ec_dev *ec)
+{
+       struct cros_ec_device *ec_dev = ec->ec_dev;
+       u8 status;
+       int ret;
+
+       /*
+        * ECs that need legacy support are the main EC, directly connected to
+        * the AP.
+        */
+       if (ec->cmd_offset != 0)
+               return;
+
+       /*
+        * Check if EC supports direct memory reads and if EC has
+        * accelerometers.
+        */
+       if (ec_dev->cmd_readmem) {
+               ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS, 1,
+                                         &status);
+               if (ret < 0) {
+                       dev_warn(ec->dev, "EC direct read error.\n");
+                       return;
+               }
+
+               /* Check if EC has accelerometers. */
+               if (!(status & EC_MEMMAP_ACC_STATUS_PRESENCE_BIT)) {
+                       dev_info(ec->dev, "EC does not have accelerometers.\n");
+                       return;
+               }
+       }
+
+       /*
+        * The device may still support accelerometers:
+        * it would be an older ARM based device that do not suppor the
+        * EC_CMD_GET_FEATURES command.
+        *
+        * Register 2 accelerometers, we will fail in the IIO driver if there
+        * are no sensors.
+        */
+       ret = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
+                             cros_ec_accel_legacy_cells,
+                             ARRAY_SIZE(cros_ec_accel_legacy_cells),
+                             NULL, 0, NULL);
+       if (ret)
+               dev_err(ec_dev->dev, "failed to add EC sensors\n");
+}
+
 static const struct mfd_cell cros_ec_cec_cells[] = {
        { .name = "cros-ec-cec" }
 };
@@ -488,6 +554,9 @@ static int ec_device_probe(struct platform_device *pdev)
        /* check whether this EC is a sensor hub. */
        if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
                cros_ec_sensors_register(ec);
+       else
+               /* Workaroud for older EC firmware */
+               cros_ec_accel_legacy_register(ec);
 
        /* Check whether this EC instance has CEC host command support */
        if (cros_ec_check_features(ec, EC_FEATURE_CEC)) {