This driver provides access to the EC RAM of said embedded controller
attached to the I2C bus as well as optionally supporting its slightly weird
power-off/restart protocol.
A particular implementation of the EC firmware can be identified by a
model byte. If this driver identifies the Dell Ariel platform, it
registers the appropriate cells.
Signed-off-by: Lubomir Rintel <lkundrak@xxxxx>
---
drivers/mfd/Kconfig | 10 ++
drivers/mfd/Makefile | 1 +
drivers/mfd/ene-kb3930.c | 209 +++++++++++++++++++++++++++++++++++++++
3 files changed, 220 insertions(+)
create mode 100644 drivers/mfd/ene-kb3930.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 2b203290e7b9f..d34cf1a026c86 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -398,6 +398,16 @@ config MFD_DLN2
etc. must be enabled in order to use the functionality of
the device.
+config MFD_ENE_KB3930
+ tristate "ENE KB3930 Embedded Controller support"
+ depends on I2C
+ depends on MACH_MMP3_DT || COMPILE_TEST
+ select MFD_CORE
+ help
+ This adds support for accessing the registers on ENE KB3930, Embedded
+ Controller. Additional drivers such as LEDS_ARIEL must be enabled in
+ order to use the functionality of the device.
+
config MFD_EXYNOS_LPASS
tristate "Samsung Exynos SoC Low Power Audio Subsystem"
depends on ARCH_EXYNOS || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b83f172545e1e..ee9a5260a26cd 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_ARCH_BCM2835) += bcm2835-pm.o
obj-$(CONFIG_MFD_BCM590XX) += bcm590xx.o
obj-$(CONFIG_MFD_BD9571MWV) += bd9571mwv.o
obj-$(CONFIG_MFD_CROS_EC_DEV) += cros_ec_dev.o
+obj-$(CONFIG_MFD_ENE_KB3930) += ene-kb3930.o
obj-$(CONFIG_MFD_EXYNOS_LPASS) += exynos-lpass.o
obj-$(CONFIG_HTC_PASIC3) += htc-pasic3.o
diff --git a/drivers/mfd/ene-kb3930.c b/drivers/mfd/ene-kb3930.c
new file mode 100644
index 0000000000000..1123f3a1c816a
--- /dev/null
+++ b/drivers/mfd/ene-kb3930.c
@@ -0,0 +1,209 @@
+// SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0-or-later
+/*
+ * ENE KB3930 Embedded Controller Driver
+ *
+ * Copyright (C) 2020 Lubomir Rintel
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+
+enum {
+ EC_DATA_IN = 0x00,
+ EC_RAM_OUT = 0x80,
+ EC_RAM_IN = 0x81,
+};
+
+enum {
+ EC_MODEL_ID = 0x30,
+ EC_VERSION_MAJ = 0x31,
+ EC_VERSION_MIN = 0x32,
+};
+
+struct kb3930 {
+ struct i2c_client *client;
+ struct regmap *ec_ram;
+ struct gpio_descs *off_gpios;
+};
+
+struct kb3930 *global_kb3930;
+
+static void kb3930_off(struct kb3930 *priv, int poweroff)
+{
+ gpiod_direction_output(priv->off_gpios->desc[1], poweroff);
+
+ while (1) {
+ mdelay(50);
+ gpiod_direction_output(priv->off_gpios->desc[0], 0);
+ mdelay(50);
+ gpiod_direction_output(priv->off_gpios->desc[0], 1);
+ }
+}
+
+static int kb3930_restart(struct notifier_block *this,
+ unsigned long mode, void *cmd)
+{
+ kb3930_off(global_kb3930, 0);
+ return NOTIFY_DONE;
+}
+
+static void kb3930_power_off(void)
+{
+ kb3930_off(global_kb3930, 1);
+}
+
+static struct notifier_block kb3930_restart_nb = {
+ .notifier_call = kb3930_restart,
+ .priority = 128,
+};
+
+static const struct mfd_cell ariel_ec_cells[] = {
+ { .name = "dell-wyse-ariel-led", },
+ { .name = "dell-wyse-ariel-power", },
+};
+
+static int kb3930_ec_ram_reg_write(void *context, unsigned int reg,
+ unsigned int val)
+{
+ struct kb3930 *priv = context;
+
+ return i2c_smbus_write_word_data(priv->client, EC_RAM_OUT,
+ (val << 8) | reg);
+}
+
+static int kb3930_ec_ram_reg_read(void *context, unsigned int reg,
+ unsigned int *val)
+{
+ struct kb3930 *priv = context;
+ int ret;
+
+ ret = i2c_smbus_write_word_data(priv->client, EC_RAM_IN, reg);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_word_data(priv->client, EC_DATA_IN);
+ if (ret < 0)
+ return ret;
+
+ *val = ret >> 8;
+ return 0;
+}
+
+static const struct regmap_config kb3930_ec_ram_regmap_config = {
+ .name = "ec_ram",
+ .reg_bits = 8,
+ .val_bits = 8,
+ .reg_stride = 1,
+ .max_register = 0xff,
+ .reg_write = kb3930_ec_ram_reg_write,
+ .reg_read = kb3930_ec_ram_reg_read,
+ .fast_io = false,
+};
+
+static int kb3930_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct device_node *np = dev->of_node;
+ struct kb3930 *priv;
+ unsigned int model_id;
+ int ret;
+
+ if (global_kb3930)
+ return -EEXIST;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ global_kb3930 = priv;
+ priv->client = client;
+ i2c_set_clientdata(client, priv);
+
+ priv->ec_ram = devm_regmap_init(dev, NULL, priv,
+ &kb3930_ec_ram_regmap_config);
+ if (IS_ERR(priv->ec_ram))
+ return PTR_ERR(priv->ec_ram);
+
+ ret = regmap_read(priv->ec_ram, EC_MODEL_ID, &model_id);
+ if (ret < 0)
+ return ret;
+
+ if (model_id == 'J') {
+ ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
+ ariel_ec_cells,
+ ARRAY_SIZE(ariel_ec_cells),
+ NULL, 0, NULL);
+ if (ret < 0)
+ return ret;
+ } else {
+ dev_err(dev, "unknown board model: %02x\n", model_id);
+ return -ENODEV;
+ }
+
+ if (of_property_read_bool (np, "system-power-controller")) {
+ priv->off_gpios = devm_gpiod_get_array_optional(dev, "off",
+ GPIOD_IN);
+ }
+ if (IS_ERR(priv->off_gpios))
+ return PTR_ERR(priv->off_gpios);
+ if (priv->off_gpios->ndescs < 2) {
+ dev_err(dev, "invalid off-gpios property\n");
+ return -EINVAL;
+ }
+ if (priv->off_gpios) {
+ register_restart_handler(&kb3930_restart_nb);
+ if (pm_power_off == NULL)
+ pm_power_off = kb3930_power_off;
+ }
+
+ dev_info(dev, "ENE KB3930 Embedded Controller\n");
+ return 0;
+}
+
+static int kb3930_remove(struct i2c_client *client)
+{
+ struct kb3930 *priv = i2c_get_clientdata(client);
+
+ if (priv->off_gpios) {
+ if (pm_power_off == kb3930_power_off)
+ pm_power_off = NULL;
+ unregister_restart_handler(&kb3930_restart_nb);
+ }
+ global_kb3930 = NULL;
+
+ return 0;
+}
+
+static const struct i2c_device_id kb3930_ids[] = {
+ { "kb3930", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, kb3930_ids);
+
+static const struct of_device_id kb3930_dt_ids[] = {
+ { .compatible = "ene,kb3930" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, kb3930_dt_ids);
+
+static struct i2c_driver kb3930_driver = {
+ .probe = kb3930_probe,
+ .remove = kb3930_remove,
+ .driver = {
+ .name = "ene-kb3930",
+ .of_match_table = of_match_ptr(kb3930_dt_ids),
+ },
+ .id_table = kb3930_ids,
+};
+
+module_i2c_driver(kb3930_driver);
+
+MODULE_AUTHOR("Lubomir Rintel <lkundrak@xxxxx>");
+MODULE_DESCRIPTION("ENE KB3930 Embedded Controller Driver");
+MODULE_LICENSE("Dual BSD/GPL");
--
2.25.1
