From patchwork Tue Dec 12 12:49:10 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nikita Travkin X-Patchwork-Id: 753369 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=trvn.ru header.i=@trvn.ru header.b="y8MLTrV8" Received: from box.trvn.ru (box.trvn.ru [194.87.146.52]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10CF5AC; Tue, 12 Dec 2023 04:49:25 -0800 (PST) Received: from authenticated-user (box.trvn.ru [194.87.146.52]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by box.trvn.ru (Postfix) with ESMTPSA id 6766641BE1; Tue, 12 Dec 2023 17:49:21 +0500 (+05) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=trvn.ru; s=mail; t=1702385363; bh=bLWcdGu2RKUhZxMWfmXCck/0u3LerjAcqrCSgmGkXzg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=y8MLTrV8+Feo7en1zbLZ9IPTYfQn05qYvEU2eZ1kf7F8VGXh1ItLDlLC7fZPCcnls JZj9UK4ziCcWENP2ddn4jClQvLN0t2xJzsI23OyCzzQMkAbxFJkSRWMei4o2ZZx5rY Zn5daDUsIdnek08GVz3xDnBlqaVEq8bwF+yn8LJADIwSgxAv9MqPAcCxf00yoTFVaU ixzqJHDkXNwTxYyykYvTfPTWur3ciw22jDiaD6c4MJGGPaUTa+t+fcbpZUYLsBUm7a uCRzEqPcIOasmfSRbKaXbwfcPfbFsx9esVvzIEn0CMhPfh0X3koPGEjGcj3Pj2lhlr +rixITsftwj4g== From: Nikita Travkin Date: Tue, 12 Dec 2023 17:49:10 +0500 Subject: [PATCH v2 2/3] power: supply: Add Acer Aspire 1 embedded controller driver Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231212-aspire1-ec-v2-2-ca495ea0a7ac@trvn.ru> References: <20231212-aspire1-ec-v2-0-ca495ea0a7ac@trvn.ru> In-Reply-To: <20231212-aspire1-ec-v2-0-ca495ea0a7ac@trvn.ru> To: Sebastian Reichel , Rob Herring , Krzysztof Kozlowski , Conor Dooley , cros-qcom-dts-watchers@chromium.org, Andy Gross , Bjorn Andersson , Konrad Dybcio Cc: linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Nikita Travkin X-Developer-Signature: v=1; a=openpgp-sha256; l=14885; i=nikita@trvn.ru; h=from:subject:message-id; bh=bLWcdGu2RKUhZxMWfmXCck/0u3LerjAcqrCSgmGkXzg=; b=owEBbQKS/ZANAwAIAUMc7O4oGb91AcsmYgBleFbOs+0eEvQzm0yjMnP246+NA9MrztopUd49d Autgyg6H3uJAjMEAAEIAB0WIQTAhK9UUj+qg34uxUdDHOzuKBm/dQUCZXhWzgAKCRBDHOzuKBm/ dSxzD/46FbyfW7+idqibPa+gGW0GVSB2lcvpsuK7RVum8qX7ToVLVAzc0RgUGV7IZVvroaN2M6y /aXIyCvhlYxlRWKEKTQ+T+8xpowD86BHPkyPw0veYb5HjQHAIaZrZ8TTsOdPBUAP20pIAO1Y7vp /pdRD6FB7V3jO23IDNL+UZQxTNe1+LyY4jL4+gRZIM+0yJRyZWjytCRJVauirTAYDD3n6GMv5Es fk4fAwKm30EsXN+Wv6ODoRVhTuuNM/CZP4gKXtAK+d3g6/MD3A/i1BlhdOS5m8TsHAIJ6tEpOg3 LgoY57/O72f856HjYHOH68Rw0eUeXfgStmJVJbzVenLwPkvNHWjYbklDRV4FSQ1dPjIXDl+96I1 rT3vYVt5Tb3iNxrUt1zb/u6xfWWR6WU0pGmNETNQgdXo48YjHkUDL5MP06BydgeQyga2SgGvwWb rUM9y/Zs3tOQ4hYypmV3wgWJUxLcnryTJO3MZZhvYICfA+uCdXJNt9CG7f4K+fnnLKsjHbL+9vg gu4BtJd2KyQZcgU4HYydmDZxfv0kg9FBUbw3m/4a+vwsHpytocWyOdIqtba5asA2ntgQZef4SFC l+4M3zANheKB60whF5DOvWDWnK0S22KooN+QwARCIRKvip+OpI+1Yg8sd0GRCgieaHenAJQi1+m SyXPY5MKcf4s1lQ== X-Developer-Key: i=nikita@trvn.ru; a=openpgp; fpr=C084AF54523FAA837E2EC547431CECEE2819BF75 Acer Aspire 1 is a Snapdragon 7c based laptop. It uses an embedded controller to control the charging and battery management, as well as to perform a set of misc functions. Unfortunately, while all this functionality is implemented in ACPI, it's currently not possible to use ACPI to boot Linux on such Qualcomm devices. To allow Linux to still support the features provided by EC, this driver reimplments the relevant ACPI parts. This allows us to boot the laptop with Device Tree and retain all the features. Signed-off-by: Nikita Travkin --- drivers/power/supply/Kconfig | 14 ++ drivers/power/supply/Makefile | 1 + drivers/power/supply/acer-aspire1-ec.c | 433 +++++++++++++++++++++++++++++++++ 3 files changed, 448 insertions(+) diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index f21cb05815ec..47d2ad14447b 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -984,4 +984,18 @@ config FUEL_GAUGE_MM8013 the state of charge, temperature, cycle count, actual and design capacity, etc. +config EC_ACER_ASPIRE1 + tristate "Acer Aspire 1 Emedded Controller driver" + depends on I2C + depends on DRM + help + Say Y here to enable the EC driver for the (Snapdragon-based) + Acer Aspire 1 laptop. The EC handles battery and charging + monitoring as well as some misc functions like the lid sensor + and USB Type-C DP HPD events. + + This driver provides battery and AC status support for the mentioned + laptop where this information is not properly exposed via the + standard ACPI devices. + endif # POWER_SUPPLY diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index 58b567278034..6049c87820c0 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -114,3 +114,4 @@ obj-$(CONFIG_CHARGER_SURFACE) += surface_charger.o obj-$(CONFIG_BATTERY_UG3105) += ug3105_battery.o obj-$(CONFIG_CHARGER_QCOM_SMB2) += qcom_pmi8998_charger.o obj-$(CONFIG_FUEL_GAUGE_MM8013) += mm8013.o +obj-$(CONFIG_EC_ACER_ASPIRE1) += acer-aspire1-ec.o diff --git a/drivers/power/supply/acer-aspire1-ec.c b/drivers/power/supply/acer-aspire1-ec.c new file mode 100644 index 000000000000..efc773a21a2f --- /dev/null +++ b/drivers/power/supply/acer-aspire1-ec.c @@ -0,0 +1,433 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2023, Nikita Travkin */ + +#include +#include +#include +#include +#include +#include + +#include +#include + +#define ASPIRE_EC_EVENT 0x05 + +#define ASPIRE_EC_EVENT_WATCHDOG 0x20 +#define ASPIRE_EC_EVENT_LID_CLOSE 0x9b +#define ASPIRE_EC_EVENT_LID_OPEN 0x9c +#define ASPIRE_EC_EVENT_FG_INF_CHG 0x85 +#define ASPIRE_EC_EVENT_FG_STA_CHG 0xc6 +#define ASPIRE_EC_EVENT_HPD_DIS 0xa3 +#define ASPIRE_EC_EVENT_HPD_CON 0xa4 + +#define ASPIRE_EC_FG_DYNAMIC 0x07 +#define ASPIRE_EC_FG_STATIC 0x08 + +#define ASPIRE_EC_FG_FLAG_PRESENT BIT(0) +#define ASPIRE_EC_FG_FLAG_FULL BIT(1) +#define ASPIRE_EC_FG_FLAG_DISCHARGING BIT(2) +#define ASPIRE_EC_FG_FLAG_CHARGING BIT(3) + +#define ASPIRE_EC_RAM_READ 0x20 +#define ASPIRE_EC_RAM_WRITE 0x21 + +#define ASPIRE_EC_RAM_WATCHDOG 0x19 +#define ASPIRE_EC_RAM_KBD_MODE 0x43 + +#define ASPIRE_EC_RAM_KBD_FN_EN BIT(0) +#define ASPIRE_EC_RAM_KBD_MEDIA_ON_TOP BIT(5) +#define ASPIRE_EC_RAM_KBD_ALWAYS_SET BIT(6) +#define ASPIRE_EC_RAM_KBD_NUM_LAYER_EN BIT(7) + +#define ASPIRE_EC_RAM_KBD_MODE_2 0x60 + +#define ASPIRE_EC_RAM_KBD_MEDIA_NOTIFY BIT(3) + +#define ASPIRE_EC_RAM_HPD_STATUS 0xf4 +#define ASPIRE_EC_HPD_CONNECTED 0x03 + +#define ASPIRE_EC_RAM_LID_STATUS 0x4c +#define ASPIRE_EC_LID_OPEN BIT(6) + +struct aspire_ec { + struct i2c_client *client; + struct power_supply *psy; + struct input_dev *idev; + + bool bridge_configured; + struct drm_bridge bridge; + struct work_struct work; +}; + +struct aspire_ec_psy_static_data { + u8 unk1; + u8 flags; + __le16 unk2; + __le16 voltage_design; + __le16 capacity_full; + __le16 unk3; + __le16 serial; + u8 model_id; + u8 vendor_id; +} __packed; + +static const char * const aspire_ec_psy_battery_model[] = { + "AP18C4K", + "AP18C8K", + "AP19B8K", + "AP16M4J", + "AP16M5J", +}; + +static const char * const aspire_ec_psy_battery_vendor[] = { + "SANYO", + "SONY", + "PANASONIC", + "SAMSUNG", + "SIMPLO", + "MOTOROLA", + "CELXPERT", + "LGC", + "GETAC", + "MURATA", +}; + +struct aspire_ec_psy_dynamic_data { + u8 unk1; + u8 flags; + u8 unk2; + __le16 capacity_now; + __le16 voltage_now; + __le16 current_now; + __le16 unk3; + __le16 unk4; +} __packed; + +static int aspire_ec_psy_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct aspire_ec *ec = power_supply_get_drvdata(psy); + struct aspire_ec_psy_static_data sdat; + struct aspire_ec_psy_dynamic_data ddat; + + i2c_smbus_read_i2c_block_data(ec->client, ASPIRE_EC_FG_STATIC, sizeof(sdat), (u8 *)&sdat); + i2c_smbus_read_i2c_block_data(ec->client, ASPIRE_EC_FG_DYNAMIC, sizeof(ddat), (u8 *)&ddat); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + if (ddat.flags & ASPIRE_EC_FG_FLAG_CHARGING) + val->intval = POWER_SUPPLY_STATUS_CHARGING; + else if (ddat.flags & ASPIRE_EC_FG_FLAG_DISCHARGING) + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + else if (ddat.flags & ASPIRE_EC_FG_FLAG_FULL) + val->intval = POWER_SUPPLY_STATUS_FULL; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + val->intval = le16_to_cpu(ddat.voltage_now) * 1000; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: + val->intval = le16_to_cpu(sdat.voltage_design) * 1000; + break; + + case POWER_SUPPLY_PROP_CHARGE_NOW: + val->intval = le16_to_cpu(ddat.capacity_now) * 1000; + break; + + case POWER_SUPPLY_PROP_CHARGE_FULL: + val->intval = le16_to_cpu(sdat.capacity_full) * 1000; + break; + + case POWER_SUPPLY_PROP_CAPACITY: + val->intval = le16_to_cpu(ddat.capacity_now) * 100; + val->intval /= le16_to_cpu(sdat.capacity_full); + break; + + case POWER_SUPPLY_PROP_CURRENT_NOW: + val->intval = (s16)le16_to_cpu(ddat.current_now) * 1000; + break; + + case POWER_SUPPLY_PROP_PRESENT: + val->intval = 1; + break; + + case POWER_SUPPLY_PROP_SCOPE: + val->intval = POWER_SUPPLY_SCOPE_SYSTEM; + break; + + case POWER_SUPPLY_PROP_MODEL_NAME: + if (sdat.model_id - 1 < ARRAY_SIZE(aspire_ec_psy_battery_model)) + val->strval = aspire_ec_psy_battery_model[sdat.model_id - 1]; + else + val->strval = "Unknown"; + break; + + case POWER_SUPPLY_PROP_MANUFACTURER: + if (sdat.vendor_id - 3 < ARRAY_SIZE(aspire_ec_psy_battery_vendor)) + val->strval = aspire_ec_psy_battery_vendor[sdat.vendor_id - 3]; + else + val->strval = "Unknown"; + break; + + default: + return -EINVAL; + } + + return 0; +} + +static enum power_supply_property aspire_ec_psy_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, + POWER_SUPPLY_PROP_CHARGE_NOW, + POWER_SUPPLY_PROP_CHARGE_FULL, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_SCOPE, + POWER_SUPPLY_PROP_MODEL_NAME, + POWER_SUPPLY_PROP_MANUFACTURER, +}; + +static const struct power_supply_desc aspire_ec_psy_desc = { + .name = "aspire-ec", + .type = POWER_SUPPLY_TYPE_BATTERY, + .get_property = aspire_ec_psy_get_property, + .properties = aspire_ec_psy_props, + .num_properties = ARRAY_SIZE(aspire_ec_psy_props), +}; + +static int aspire_ec_ram_read(struct i2c_client *client, u8 off, u8 *data, u8 data_len) +{ + i2c_smbus_write_byte_data(client, ASPIRE_EC_RAM_READ, off); + i2c_smbus_read_i2c_block_data(client, ASPIRE_EC_RAM_READ, data_len, data); + return 0; +} + +static int aspire_ec_ram_write(struct i2c_client *client, u8 off, u8 data) +{ + u8 tmp[2] = {off, data}; + + i2c_smbus_write_i2c_block_data(client, ASPIRE_EC_RAM_WRITE, sizeof(tmp), tmp); + return 0; +} + +static irqreturn_t aspire_ec_irq_handler(int irq, void *data) +{ + struct aspire_ec *ec = data; + int id; + u8 tmp; + + /* + * The original ACPI firmware actually has a small sleep in the handler. + * + * It seems like in most cases it's not needed but when the device + * just exits suspend, our i2c driver has a brief time where data + * transfer is not possible yet. So this delay allows us to suppress + * quite a bunch of spurious error messages in dmesg. Thus it's kept. + */ + usleep_range(15000, 30000); + + id = i2c_smbus_read_byte_data(ec->client, ASPIRE_EC_EVENT); + if (id < 0) { + dev_err(&ec->client->dev, "Failed to read event id: %pe\n", ERR_PTR(id)); + return IRQ_HANDLED; + } + + switch (id) { + case 0x0: /* No event */ + break; + + case ASPIRE_EC_EVENT_WATCHDOG: + /* + * Here acpi responds to the event and clears some bit. + * Notify (\_SB.I2C3.BAT1, 0x81) // Information Change + * Notify (\_SB.I2C3.ADP1, 0x80) // Status Change + */ + aspire_ec_ram_read(ec->client, ASPIRE_EC_RAM_WATCHDOG, &tmp, sizeof(tmp)); + aspire_ec_ram_write(ec->client, ASPIRE_EC_RAM_WATCHDOG, tmp & 0xbf); + break; + + case ASPIRE_EC_EVENT_LID_CLOSE: + /* Notify (\_SB.LID0, 0x80) // Status Change */ + input_report_switch(ec->idev, SW_LID, 1); + input_sync(ec->idev); + break; + + case ASPIRE_EC_EVENT_LID_OPEN: + /* Notify (\_SB.LID0, 0x80) // Status Change */ + input_report_switch(ec->idev, SW_LID, 0); + input_sync(ec->idev); + break; + + case ASPIRE_EC_EVENT_FG_INF_CHG: + /* Notify (\_SB.I2C3.BAT1, 0x81) // Information Change */ + case ASPIRE_EC_EVENT_FG_STA_CHG: + /* Notify (\_SB.I2C3.BAT1, 0x80) // Status Change */ + power_supply_changed(ec->psy); + break; + + case ASPIRE_EC_EVENT_HPD_DIS: + if (ec->bridge_configured) + drm_bridge_hpd_notify(&ec->bridge, connector_status_disconnected); + break; + + case ASPIRE_EC_EVENT_HPD_CON: + if (ec->bridge_configured) + drm_bridge_hpd_notify(&ec->bridge, connector_status_connected); + break; + + default: + dev_warn(&ec->client->dev, "Unknown event id=0x%x\n", id); + } + + return IRQ_HANDLED; +} + +static int aspire_ec_bridge_attach(struct drm_bridge *bridge, enum drm_bridge_attach_flags flags) +{ + return flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR ? 0 : -EINVAL; +} + +static void aspire_ec_bridge_update_hpd_work(struct work_struct *work) +{ + struct aspire_ec *ec = container_of(work, struct aspire_ec, work); + u8 tmp; + + aspire_ec_ram_read(ec->client, ASPIRE_EC_RAM_HPD_STATUS, &tmp, sizeof(tmp)); + if (tmp == ASPIRE_EC_HPD_CONNECTED) + drm_bridge_hpd_notify(&ec->bridge, connector_status_connected); + else + drm_bridge_hpd_notify(&ec->bridge, connector_status_disconnected); +} + +static void aspire_ec_bridge_hpd_enable(struct drm_bridge *bridge) +{ + struct aspire_ec *ec = container_of(bridge, struct aspire_ec, bridge); + + schedule_work(&ec->work); +} + +static const struct drm_bridge_funcs aspire_ec_bridge_funcs = { + .hpd_enable = aspire_ec_bridge_hpd_enable, + .attach = aspire_ec_bridge_attach, +}; + +static int aspire_ec_probe(struct i2c_client *client) +{ + struct power_supply_config psy_cfg = {0}; + struct device *dev = &client->dev; + struct fwnode_handle *fwnode; + struct aspire_ec *ec; + int ret; + u8 tmp; + + ec = devm_kzalloc(dev, sizeof(*ec), GFP_KERNEL); + if (!ec) + return -ENOMEM; + + ec->client = client; + i2c_set_clientdata(client, ec); + + /* Battery status reports */ + psy_cfg.drv_data = ec; + ec->psy = devm_power_supply_register(dev, &aspire_ec_psy_desc, &psy_cfg); + if (IS_ERR(ec->psy)) + return dev_err_probe(dev, PTR_ERR(ec->psy), + "Failed to register power supply\n"); + + /* Lid switch */ + ec->idev = devm_input_allocate_device(dev); + if (!ec->idev) + return -ENOMEM; + + ec->idev->name = "aspire-ec"; + ec->idev->phys = "aspire-ec/input0"; + input_set_capability(ec->idev, EV_SW, SW_LID); + + ret = input_register_device(ec->idev); + if (ret) + return dev_err_probe(dev, ret, "Input device register failed\n"); + + /* Enable the keyboard fn keys */ + tmp = ASPIRE_EC_RAM_KBD_FN_EN | ASPIRE_EC_RAM_KBD_ALWAYS_SET; + if (device_property_read_bool(dev, "acer,media-keys-on-top")) + tmp |= ASPIRE_EC_RAM_KBD_MEDIA_ON_TOP; + aspire_ec_ram_write(client, ASPIRE_EC_RAM_KBD_MODE, tmp); + + aspire_ec_ram_read(client, ASPIRE_EC_RAM_KBD_MODE_2, &tmp, sizeof(tmp)); + tmp |= ASPIRE_EC_RAM_KBD_MEDIA_NOTIFY; + aspire_ec_ram_write(client, ASPIRE_EC_RAM_KBD_MODE_2, tmp); + + /* External Type-C display attach reports */ + fwnode = device_get_named_child_node(dev, "connector"); + if (fwnode) { + INIT_WORK(&ec->work, aspire_ec_bridge_update_hpd_work); + ec->bridge.funcs = &aspire_ec_bridge_funcs; + ec->bridge.of_node = to_of_node(fwnode); + ec->bridge.ops = DRM_BRIDGE_OP_HPD; + ec->bridge.type = DRM_MODE_CONNECTOR_USB; + + ret = devm_drm_bridge_add(dev, &ec->bridge); + if (ret) { + fwnode_handle_put(fwnode); + return dev_err_probe(dev, ret, "Failed to register drm bridge\n"); + } + + ec->bridge_configured = true; + } + + ret = devm_request_threaded_irq(dev, client->irq, NULL, + aspire_ec_irq_handler, IRQF_ONESHOT, + dev_name(dev), ec); + if (ret) + return dev_err_probe(dev, ret, "Failed to request irq\n"); + + return 0; +} + +static int aspire_ec_resume(struct device *dev) +{ + struct aspire_ec *ec = i2c_get_clientdata(to_i2c_client(dev)); + u8 tmp; + + aspire_ec_ram_read(ec->client, ASPIRE_EC_RAM_LID_STATUS, &tmp, sizeof(tmp)); + input_report_switch(ec->idev, SW_LID, !!(tmp & ASPIRE_EC_LID_OPEN)); + input_sync(ec->idev); + + return 0; +} + +static const struct i2c_device_id aspire_ec_id[] = { + { "aspire1-ec", }, + { } +}; +MODULE_DEVICE_TABLE(i2c, aspire_ec_id); + +static const struct of_device_id aspire_ec_of_match[] = { + { .compatible = "acer,aspire1-ec", }, + { } +}; +MODULE_DEVICE_TABLE(of, aspire_ec_of_match); + +static DEFINE_SIMPLE_DEV_PM_OPS(aspire_ec_pm_ops, NULL, aspire_ec_resume); + +static struct i2c_driver aspire_ec_driver = { + .driver = { + .name = "aspire-ec", + .of_match_table = aspire_ec_of_match, + .pm = pm_sleep_ptr(&aspire_ec_pm_ops), + }, + .probe = aspire_ec_probe, + .id_table = aspire_ec_id, +}; +module_i2c_driver(aspire_ec_driver); + +MODULE_DESCRIPTION("Acer Aspire 1 embedded controller"); +MODULE_AUTHOR("Nikita Travkin "); +MODULE_LICENSE("GPL");