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Sun, 01 Feb 2026 02:44:15 -0800 (PST) From: Svyatoslav Ryhel To: Lee Jones , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Dmitry Torokhov , Pavel Machek , Arnd Bergmann , Greg Kroah-Hartman , Sebastian Reichel , Svyatoslav Ryhel , =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= , Ion Agorria Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH v1 4/9] mfd: Add driver for Asus Transformer embedded controller Date: Sun, 1 Feb 2026 12:43:38 +0200 Message-ID: <20260201104343.79231-5-clamor95@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260201104343.79231-1-clamor95@gmail.com> References: <20260201104343.79231-1-clamor95@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Micha=C5=82 Miros=C5=82aw Support Nuvoton NPCE795-based ECs as used in Asus Transformer TF201, TF300T, TF300TG, TF300TL and TF700T pad and dock, as well as TF101 dock and TF600T, P1801-T and TF701T pad. This is a glue driver handling detection and common operations for EC's functions. Co-developed-by: Svyatoslav Ryhel Signed-off-by: Svyatoslav Ryhel Signed-off-by: Micha=C5=82 Miros=C5=82aw --- drivers/mfd/Kconfig | 14 ++ drivers/mfd/Makefile | 1 + drivers/mfd/asus-ec.c | 460 ++++++++++++++++++++++++++++++++++++ include/linux/mfd/asus-ec.h | 101 +++++++- 4 files changed, 573 insertions(+), 3 deletions(-) create mode 100644 drivers/mfd/asus-ec.c diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 7192c9d1d268..c7b32a4e65fa 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -137,6 +137,20 @@ config MFD_AAT2870_CORE additional drivers must be enabled in order to use the functionality of the device. =20 +config MFD_ASUSEC + tristate "ASUS embedded controller" + depends on I2C && OF + select SYSFS + select ASUS_DOCKRAM + help + Support ECs as found in ASUS Transformer's Pad and Mobile Dock. + + This provides shared glue for functional part drivers: + leds-asusec, serio-asusec, asusec-ext-keys, asusec-battery. + + This driver can also be built as a module. If so, the module + will be called asus-ec. + config MFD_AT91_USART tristate "AT91 USART Driver" select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index e75e8045c28a..b676922601ba 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_MFD_88PM805) +=3D 88pm805.o 88pm80x.o obj-$(CONFIG_MFD_88PM886_PMIC) +=3D 88pm886.o obj-$(CONFIG_MFD_ACT8945A) +=3D act8945a.o obj-$(CONFIG_MFD_SM501) +=3D sm501.o +obj-$(CONFIG_MFD_ASUSEC) +=3D asus-ec.o obj-$(CONFIG_ARCH_BCM2835) +=3D bcm2835-pm.o obj-$(CONFIG_MFD_BCM590XX) +=3D bcm590xx.o obj-$(CONFIG_MFD_BD9571MWV) +=3D bd9571mwv.o diff --git a/drivers/mfd/asus-ec.c b/drivers/mfd/asus-ec.c new file mode 100644 index 000000000000..09a914a963fe --- /dev/null +++ b/drivers/mfd/asus-ec.c @@ -0,0 +1,460 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ASUS EC driver + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define ASUSEC_RSP_BUFFER_SIZE 8 + +struct asus_ec_chip_data { + const char *name; + const struct mfd_cell *mfd_devices; + unsigned int num_devices; +}; + +struct asus_ec_data { + struct asusec_info info; + struct mutex ecreq_lock; /* prevent simultaneous access */ + struct gpio_desc *ecreq; + struct i2c_client *self; + const struct asus_ec_chip_data *data; + u8 ec_data[DOCKRAM_ENTRY_BUFSIZE]; + bool logging_disabled; +}; + +#define to_ec_data(ec) \ + container_of(ec, struct asus_ec_data, info) + +static void asus_ec_remove_notifier(struct device *dev, void *res) +{ + struct asusec_info *ec =3D dev_get_drvdata(dev->parent); + struct notifier_block **nb =3D res; + + blocking_notifier_chain_unregister(&ec->notify_list, *nb); +} + +int devm_asus_ec_register_notifier(struct platform_device *pdev, + struct notifier_block *nb) +{ + struct asusec_info *ec =3D dev_get_drvdata(pdev->dev.parent); + struct notifier_block **res; + int ret; + + res =3D devres_alloc(asus_ec_remove_notifier, sizeof(*res), GFP_KERNEL); + if (!res) + return -ENOMEM; + + *res =3D nb; + ret =3D blocking_notifier_chain_register(&ec->notify_list, nb); + if (ret) { + devres_free(res); + return ret; + } + + devres_add(&pdev->dev, res); + + return 0; +} +EXPORT_SYMBOL_GPL(devm_asus_ec_register_notifier); + +static int asus_ec_signal_request(const struct asusec_info *ec) +{ + struct asus_ec_data *priv =3D to_ec_data(ec); + + guard(mutex)(&priv->ecreq_lock); + + dev_dbg(&priv->self->dev, "EC request\n"); + + gpiod_set_value_cansleep(priv->ecreq, 1); + msleep(50); + + gpiod_set_value_cansleep(priv->ecreq, 0); + msleep(200); + + return 0; +} + +static int asus_ec_write(struct asus_ec_data *priv, u16 data) +{ + int ret =3D i2c_smbus_write_word_data(priv->self, 0x64, data); + + dev_dbg(&priv->self->dev, "EC write: %04x, ret =3D %d\n", data, ret); + return ret; +} + +static int asus_ec_read(struct asus_ec_data *priv, bool in_irq) +{ + int ret =3D i2c_smbus_read_i2c_block_data(priv->self, 0x6A, + sizeof(priv->ec_data), + priv->ec_data); + + dev_dbg(&priv->self->dev, "EC read: %*ph, ret =3D %d%s\n", + sizeof(priv->ec_data), priv->ec_data, + ret, in_irq ? "; in irq" : ""); + + return ret; +} + +int asus_ec_i2c_command(const struct asusec_info *ec, u16 data) +{ + return asus_ec_write(to_ec_data(ec), data); +} +EXPORT_SYMBOL_GPL(asus_ec_i2c_command); + +static void asus_ec_clear_buffer(struct asus_ec_data *priv) +{ + int retry =3D ASUSEC_RSP_BUFFER_SIZE; + + while (retry--) { + if (asus_ec_read(priv, false) < 0) + continue; + + if (priv->ec_data[1] & ASUSEC_OBF_MASK) + continue; + + break; + } +} + +static int asus_ec_log_info(struct asus_ec_data *priv, unsigned int reg, + const char *name, char **out) +{ + char buf[DOCKRAM_ENTRY_BUFSIZE]; + int ret; + + ret =3D asus_dockram_read(priv->info.dockram, reg, buf); + if (ret < 0) + return ret; + + if (!priv->logging_disabled) + dev_info(&priv->self->dev, "%-14s: %.*s\n", name, buf[0], buf + 1); + + if (out) + *out =3D kstrndup(buf + 1, buf[0], GFP_KERNEL); + + return 0; +} + +static int asus_ec_reset(struct asus_ec_data *priv) +{ + int retry, ret; + + for (retry =3D 0; retry < 3; retry++) { + ret =3D asus_ec_write(priv, 0); + if (!ret) + return 0; + + msleep(300); + } + + return ret; +} + +static int asus_ec_magic_debug(struct asus_ec_data *priv) +{ + u64 flag; + int ret; + + ret =3D asus_ec_get_ctl(&priv->info, &flag); + if (ret < 0) + return ret; + + flag &=3D ASUSEC_CTL_SUSB_MODE; + dev_info(&priv->self->dev, "EC FW behaviour: %s\n", + flag ? "susb on when receive ec_req" : "susb on when system wakeup"); + + return 0; +} + +static int asus_ec_set_factory_mode(struct asus_ec_data *priv, bool on) +{ + dev_info(&priv->self->dev, "Entering %s mode.\n", on ? "factory" : "norma= l"); + return asus_ec_update_ctl(&priv->info, ASUSEC_CTL_FACTORY_MODE, + on ? ASUSEC_CTL_FACTORY_MODE : 0); +} + +static void asus_ec_handle_smi(struct asus_ec_data *priv, unsigned int cod= e); + +static irqreturn_t asus_ec_interrupt(int irq, void *dev_id) +{ + struct asus_ec_data *priv =3D dev_id; + unsigned long notify_action; + int ret; + + ret =3D asus_ec_read(priv, true); + if (ret <=3D 0 || !(priv->ec_data[1] & ASUSEC_OBF_MASK)) + return IRQ_NONE; + + notify_action =3D priv->ec_data[1]; + if (notify_action & ASUSEC_SMI_MASK) { + unsigned int code =3D priv->ec_data[2]; + + asus_ec_handle_smi(priv, code); + + notify_action |=3D code << 8; + dev_dbg(&priv->self->dev, "SMI code: 0x%02x\n", code); + } + + blocking_notifier_call_chain(&priv->info.notify_list, + notify_action, priv->ec_data); + + return IRQ_HANDLED; +} + +static int asus_ec_detect(struct asus_ec_data *priv) +{ + char *model =3D NULL; + int ret; + + ret =3D asus_ec_reset(priv); + if (ret) + goto err_exit; + + asus_ec_clear_buffer(priv); + + ret =3D asus_ec_log_info(priv, ASUSEC_DOCKRAM_INFO_MODEL, "model", &model= ); + if (ret) + goto err_exit; + + ret =3D asus_ec_log_info(priv, ASUSEC_DOCKRAM_INFO_FW, "FW version", NULL= ); + if (ret) + goto err_exit; + + ret =3D asus_ec_log_info(priv, ASUSEC_DOCKRAM_INFO_CFGFMT, "Config format= ", NULL); + if (ret) + goto err_exit; + + ret =3D asus_ec_log_info(priv, ASUSEC_DOCKRAM_INFO_HW, "HW version", NULL= ); + if (ret) + goto err_exit; + + priv->logging_disabled =3D true; + + ret =3D asus_ec_magic_debug(priv); + if (ret) + goto err_exit; + + priv->info.model =3D model; + priv->info.name =3D priv->data->name; + + if (device_property_read_bool(&priv->self->dev, "asus,clear-factory-mode"= )) + asus_ec_set_factory_mode(priv, false); + +err_exit: + if (ret) + dev_err(&priv->self->dev, "failed to access EC: %d\n", ret); + + return ret; +} + +static void asus_ec_handle_smi(struct asus_ec_data *priv, unsigned int cod= e) +{ + dev_dbg(&priv->self->dev, "SMI interrupt: 0x%02x\n", code); + + switch (code) { + case ASUSEC_SMI_HANDSHAKE: + case ASUSEC_SMI_RESET: + asus_ec_detect(priv); + break; + } +} + +static ssize_t ec_request_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct asusec_info *ec =3D dev_get_drvdata(dev); + + asus_ec_signal_request(ec); + + return count; +} + +static ssize_t ec_irq_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct asusec_info *ec =3D dev_get_drvdata(dev); + struct asus_ec_data *priv =3D to_ec_data(ec); + + irq_wake_thread(priv->self->irq, priv); + + return count; +} + +static DEVICE_ATTR_WO(ec_request); +static DEVICE_ATTR_WO(ec_irq); + +static struct attribute *asus_ec_attributes[] =3D { + &dev_attr_ec_request.attr, + &dev_attr_ec_irq.attr, + NULL +}; + +static const struct attribute_group asus_ec_attr_group =3D { + .attrs =3D asus_ec_attributes, +}; + +static void asus_ec_sysfs_release(void *data) +{ + struct i2c_client *client =3D data; + + sysfs_remove_link(&client->dev.kobj, "dockram"); +} + +static int asus_ec_probe(struct i2c_client *client) +{ + struct asus_ec_data *priv; + int ret; + + priv =3D devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->data =3D device_get_match_data(&client->dev); + if (!priv->data) + return -ENODEV; + + i2c_set_clientdata(client, priv); + priv->self =3D client; + + priv->info.dockram =3D devm_asus_dockram_get(&client->dev); + if (IS_ERR(priv->info.dockram)) + return dev_err_probe(&client->dev, PTR_ERR(priv->info.dockram), + "failed to get dockram\n"); + + priv->ecreq =3D devm_gpiod_get(&client->dev, "request", GPIOD_OUT_LOW); + if (IS_ERR(priv->ecreq)) + return dev_err_probe(&client->dev, PTR_ERR(priv->ecreq), + "failed to get request GPIO\n"); + + BLOCKING_INIT_NOTIFIER_HEAD(&priv->info.notify_list); + mutex_init(&priv->ecreq_lock); + + ret =3D devm_device_add_group(&client->dev, &asus_ec_attr_group); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to create sysfs attributes\n"); + + ret =3D sysfs_create_link(&client->dev.kobj, + &priv->info.dockram->dev.kobj, + "dockram"); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to create sysfs link 'dockram'\n"); + + ret =3D devm_add_action_or_reset(&client->dev, asus_ec_sysfs_release, + client); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to register sysfs release\n"); + + asus_ec_signal_request(&priv->info); + + ret =3D asus_ec_detect(priv); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to detect EC version\n"); + + ret =3D devm_request_threaded_irq(&client->dev, client->irq, + NULL, &asus_ec_interrupt, + IRQF_ONESHOT | IRQF_SHARED, + client->name, priv); + if (ret) + return dev_err_probe(&client->dev, ret, + "failed to register IRQ\n"); + + /* Parent I2C controller uses DMA, ASUS EC and child devices do not */ + client->dev.coherent_dma_mask =3D 0; + client->dev.dma_mask =3D &client->dev.coherent_dma_mask; + + return devm_mfd_add_devices(&client->dev, 0, priv->data->mfd_devices, + priv->data->num_devices, NULL, 0, NULL); +} + +static const struct mfd_cell asus_ec_pad_mfd_devices[] =3D { + { + .name =3D "asus-ec-battery", + .id =3D 0, + .of_compatible =3D "asus,ec-battery", + }, { + .name =3D "asus-ec-charger", + .id =3D 0, + .of_compatible =3D "asus,ec-charger", + }, { + .name =3D "asus-ec-led", + .id =3D 0, + .of_compatible =3D "asus,ec-led", + }, +}; + +static const struct mfd_cell asus_ec_dock_mfd_devices[] =3D { + { + .name =3D "asus-ec-battery", + .id =3D 1, + .of_compatible =3D "asus,ec-battery", + }, { + .name =3D "asus-ec-charger", + .id =3D 1, + .of_compatible =3D "asus,ec-charger", + }, { + .name =3D "asus-ec-led", + .id =3D 1, + .of_compatible =3D "asus,ec-led", + }, { + .name =3D "asus-ec-keys", + .of_compatible =3D "asus,ec-keys", + }, { + .name =3D "asus-ec-kbc", + .of_compatible =3D "asus,ec-kbc", + }, +}; + +static const struct asus_ec_chip_data asus_ec_pad_data =3D { + .name =3D "pad", + .mfd_devices =3D asus_ec_pad_mfd_devices, + .num_devices =3D ARRAY_SIZE(asus_ec_pad_mfd_devices), +}; + +static const struct asus_ec_chip_data asus_ec_dock_data =3D { + .name =3D "dock", + .mfd_devices =3D asus_ec_dock_mfd_devices, + .num_devices =3D ARRAY_SIZE(asus_ec_dock_mfd_devices), +}; + +static const struct of_device_id asus_ec_match[] =3D { + { .compatible =3D "asus,ec-pad", .data =3D &asus_ec_pad_data }, + { .compatible =3D "asus,ec-dock", .data =3D &asus_ec_dock_data }, + { } +}; +MODULE_DEVICE_TABLE(of, asus_ec_match); + +static struct i2c_driver asus_ec_driver =3D { + .driver =3D { + .name =3D "asus-ec", + .of_match_table =3D asus_ec_match, + }, + .probe =3D asus_ec_probe, +}; +module_i2c_driver(asus_ec_driver); + +MODULE_AUTHOR("Micha=C5=82 Miros=C5=82aw "); +MODULE_AUTHOR("Svyatoslav Ryhel "); +MODULE_DESCRIPTION("ASUS Transformer's EC driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/asus-ec.h b/include/linux/mfd/asus-ec.h index bc4efa37f5ba..11b16295afcd 100644 --- a/include/linux/mfd/asus-ec.h +++ b/include/linux/mfd/asus-ec.h @@ -2,8 +2,76 @@ #ifndef __MISC_ASUS_EC_H #define __MISC_ASUS_EC_H =20 +#include +#include +#include + struct i2c_client; =20 +struct asusec_info { + const char *model; + const char *name; + struct i2c_client *dockram; + struct workqueue_struct *wq; + struct blocking_notifier_head notify_list; +}; + +#define DOCKRAM_ENTRIES 0x100 +#define DOCKRAM_ENTRY_SIZE 32 +#define DOCKRAM_ENTRY_BUFSIZE (DOCKRAM_ENTRY_SIZE + 1) + +/* interrupt sources */ +#define ASUSEC_OBF_MASK BIT(0) +#define ASUSEC_KEY_MASK BIT(2) +#define ASUSEC_KBC_MASK BIT(3) +#define ASUSEC_AUX_MASK BIT(5) +#define ASUSEC_SCI_MASK BIT(6) +#define ASUSEC_SMI_MASK BIT(7) + +/* SMI notification codes */ +#define ASUSEC_SMI_POWER_NOTIFY 0x31 /* [un]plugging USB cable */ +#define ASUSEC_SMI_HANDSHAKE 0x50 /* response to ec_req edge */ +#define ASUSEC_SMI_WAKE 0x53 +#define ASUSEC_SMI_RESET 0x5f +#define ASUSEC_SMI_ADAPTER_EVENT 0x60 /* [un]plugging charger to dock */ +#define ASUSEC_SMI_BACKLIGHT_ON 0x63 +#define ASUSEC_SMI_AUDIO_DOCK_IN 0x70 + +#define ASUSEC_SMI_ACTION(code) (ASUSEC_SMI_MASK | ASUSEC_OBF_MASK | \ + (ASUSEC_SMI_##code << 8)) + +/* control register [0x0A] layout */ +#define ASUSEC_CTL_SIZE 8 + +/* + * EC reports power from 40-pin connector in the LSB of the control + * register. The following values have been observed (xor 0x02): + * + * PAD-ec no-plug 0x40 / PAD-ec DOCK 0x20 / DOCK-ec no-plug 0x40 + * PAD-ec AC 0x25 / PAD-ec DOCK+AC 0x24 / DOCK-ec AC 0x25 + * PAD-ec USB 0x45 / PAD-ec DOCK+USB 0x24 / DOCK-ec USB 0x41 + */ + +#define ASUSEC_CTL_DIRECT_POWER_SOURCE BIT_ULL(0) +#define ASUSEC_STAT_CHARGING BIT_ULL(2) +#define ASUSEC_CTL_FULL_POWER_SOURCE BIT_ULL(5) +#define ASUSEC_CTL_SUSB_MODE BIT_ULL(11) +#define ASUSEC_CMD_SUSPEND_S3 BIT_ULL(41) +#define ASUSEC_CTL_TEST_DISCHARGE BIT_ULL(43) +#define ASUSEC_CMD_SUSPEND_INHIBIT BIT_ULL(45) +#define ASUSEC_CTL_FACTORY_MODE BIT_ULL(46) +#define ASUSEC_CTL_KEEP_AWAKE BIT_ULL(47) +#define ASUSEC_CTL_USB_CHARGE BIT_ULL(50) +#define ASUSEC_CMD_SWITCH_HDMI BIT_ULL(70) +#define ASUSEC_CMD_WIN_SHUTDOWN BIT_ULL(76) + +#define ASUSEC_DOCKRAM_INFO_MODEL 0x01 +#define ASUSEC_DOCKRAM_INFO_FW 0x02 +#define ASUSEC_DOCKRAM_INFO_CFGFMT 0x03 +#define ASUSEC_DOCKRAM_INFO_HW 0x04 +#define ASUSEC_DOCKRAM_CONTROL 0x0a +#define ASUSEC_DOCKRAM_BATT_CTL 0x14 + /* dockram comm */ int asus_dockram_read(struct i2c_client *client, int reg, char *buf); int asus_dockram_write(struct i2c_client *client, int reg, const char *buf= ); @@ -11,8 +79,35 @@ int asus_dockram_access_ctl(struct i2c_client *client, u64 *out, u64 mask, u64 xor); struct i2c_client *devm_asus_dockram_get(struct device *parent); =20 -#define DOCKRAM_ENTRIES 0x100 -#define DOCKRAM_ENTRY_SIZE 32 -#define DOCKRAM_ENTRY_BUFSIZE (DOCKRAM_ENTRY_SIZE + 1) +/* EC public API */ +static inline struct asusec_info *cell_to_ec(struct platform_device *pdev) +{ + return dev_get_drvdata(pdev->dev.parent); +} + +static inline int asus_ec_get_ctl(const struct asusec_info *ec, u64 *out) +{ + return asus_dockram_access_ctl(ec->dockram, out, 0, 0); +} + +static inline int asus_ec_update_ctl(const struct asusec_info *ec, + u64 mask, u64 xor) +{ + return asus_dockram_access_ctl(ec->dockram, NULL, mask, xor); +} + +static inline int asus_ec_set_ctl_bits(const struct asusec_info *ec, u64 m= ask) +{ + return asus_dockram_access_ctl(ec->dockram, NULL, mask, mask); +} + +static inline int asus_ec_clear_ctl_bits(const struct asusec_info *ec, u64= mask) +{ + return asus_dockram_access_ctl(ec->dockram, NULL, mask, 0); +} + +int asus_ec_i2c_command(const struct asusec_info *ec, u16 data); +int devm_asus_ec_register_notifier(struct platform_device *dev, + struct notifier_block *nb); =20 #endif /* __MISC_ASUS_EC_H */ --=20 2.51.0