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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>
This commit is contained in:
Gwendal Grignou 2019-06-11 00:12:36 -07:00 committed by Lee Jones
parent ac195d9428
commit ecc2ca47f3
1 changed files with 69 additions and 0 deletions
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69
drivers/mfd/cros_ec_dev.c
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@ -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)) {