2020-12-28 11:05:46 -05:00
|
|
|
// SPDX-License-Identifier: GPL-2.0+
|
|
|
|
/*
|
|
|
|
* Acer Iconia Tab A500 Embedded Controller Driver
|
|
|
|
*
|
|
|
|
* Copyright 2020 GRATE-driver project
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/delay.h>
|
|
|
|
#include <linux/i2c.h>
|
|
|
|
#include <linux/mfd/core.h>
|
|
|
|
#include <linux/module.h>
|
2023-07-14 13:47:27 -04:00
|
|
|
#include <linux/of.h>
|
2020-12-28 11:05:46 -05:00
|
|
|
#include <linux/reboot.h>
|
|
|
|
#include <linux/regmap.h>
|
|
|
|
|
|
|
|
#define A500_EC_I2C_ERR_TIMEOUT 500
|
|
|
|
#define A500_EC_POWER_CMD_TIMEOUT 1000
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Controller's firmware expects specific command opcodes to be used for the
|
|
|
|
* corresponding registers. Unsupported commands are skipped by the firmware.
|
|
|
|
*/
|
|
|
|
#define CMD_SHUTDOWN 0x0
|
|
|
|
#define CMD_WARM_REBOOT 0x0
|
|
|
|
#define CMD_COLD_REBOOT 0x1
|
|
|
|
|
|
|
|
enum {
|
|
|
|
REG_CURRENT_NOW = 0x03,
|
|
|
|
REG_SHUTDOWN = 0x52,
|
|
|
|
REG_WARM_REBOOT = 0x54,
|
|
|
|
REG_COLD_REBOOT = 0x55,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct i2c_client *a500_ec_client_pm_off;
|
|
|
|
|
|
|
|
static int a500_ec_read(void *context, const void *reg_buf, size_t reg_size,
|
|
|
|
void *val_buf, size_t val_sizel)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = context;
|
|
|
|
unsigned int reg, retries = 5;
|
|
|
|
u16 *ret_val = val_buf;
|
|
|
|
s32 ret = 0;
|
|
|
|
|
|
|
|
reg = *(u8 *)reg_buf;
|
|
|
|
|
|
|
|
while (retries-- > 0) {
|
|
|
|
ret = i2c_smbus_read_word_data(client, reg);
|
|
|
|
if (ret >= 0)
|
|
|
|
break;
|
|
|
|
|
|
|
|
msleep(A500_EC_I2C_ERR_TIMEOUT);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&client->dev, "read 0x%x failed: %d\n", reg, ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
*ret_val = ret;
|
|
|
|
|
|
|
|
if (reg == REG_CURRENT_NOW)
|
|
|
|
fsleep(10000);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int a500_ec_write(void *context, const void *data, size_t count)
|
|
|
|
{
|
|
|
|
struct i2c_client *client = context;
|
|
|
|
unsigned int reg, val, retries = 5;
|
|
|
|
s32 ret = 0;
|
|
|
|
|
|
|
|
reg = *(u8 *)(data + 0);
|
|
|
|
val = *(u16 *)(data + 1);
|
|
|
|
|
|
|
|
while (retries-- > 0) {
|
|
|
|
ret = i2c_smbus_write_word_data(client, reg, val);
|
|
|
|
if (ret >= 0)
|
|
|
|
break;
|
|
|
|
|
|
|
|
msleep(A500_EC_I2C_ERR_TIMEOUT);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(&client->dev, "write 0x%x failed: %d\n", reg, ret);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct regmap_config a500_ec_regmap_config = {
|
|
|
|
.name = "KB930",
|
|
|
|
.reg_bits = 8,
|
|
|
|
.val_bits = 16,
|
|
|
|
.max_register = 0xff,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct regmap_bus a500_ec_regmap_bus = {
|
|
|
|
.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
|
|
|
|
.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
|
|
|
|
.write = a500_ec_write,
|
|
|
|
.read = a500_ec_read,
|
|
|
|
.max_raw_read = 2,
|
|
|
|
};
|
|
|
|
|
|
|
|
static void a500_ec_poweroff(void)
|
|
|
|
{
|
|
|
|
i2c_smbus_write_word_data(a500_ec_client_pm_off,
|
|
|
|
REG_SHUTDOWN, CMD_SHUTDOWN);
|
|
|
|
|
|
|
|
mdelay(A500_EC_POWER_CMD_TIMEOUT);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int a500_ec_restart_notify(struct notifier_block *this,
|
|
|
|
unsigned long reboot_mode, void *data)
|
|
|
|
{
|
|
|
|
if (reboot_mode == REBOOT_WARM)
|
|
|
|
i2c_smbus_write_word_data(a500_ec_client_pm_off,
|
|
|
|
REG_WARM_REBOOT, CMD_WARM_REBOOT);
|
|
|
|
else
|
|
|
|
i2c_smbus_write_word_data(a500_ec_client_pm_off,
|
|
|
|
REG_COLD_REBOOT, CMD_COLD_REBOOT);
|
|
|
|
|
|
|
|
mdelay(A500_EC_POWER_CMD_TIMEOUT);
|
|
|
|
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block a500_ec_restart_handler = {
|
|
|
|
.notifier_call = a500_ec_restart_notify,
|
|
|
|
.priority = 200,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct mfd_cell a500_ec_cells[] = {
|
|
|
|
{ .name = "acer-a500-iconia-battery", },
|
|
|
|
{ .name = "acer-a500-iconia-leds", },
|
|
|
|
};
|
|
|
|
|
|
|
|
static int a500_ec_probe(struct i2c_client *client)
|
|
|
|
{
|
|
|
|
struct regmap *regmap;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
regmap = devm_regmap_init(&client->dev, &a500_ec_regmap_bus,
|
|
|
|
client, &a500_ec_regmap_config);
|
|
|
|
if (IS_ERR(regmap))
|
|
|
|
return PTR_ERR(regmap);
|
|
|
|
|
|
|
|
err = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO,
|
|
|
|
a500_ec_cells, ARRAY_SIZE(a500_ec_cells),
|
|
|
|
NULL, 0, NULL);
|
|
|
|
if (err) {
|
|
|
|
dev_err(&client->dev, "failed to add sub-devices: %d\n", err);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (of_device_is_system_power_controller(client->dev.of_node)) {
|
|
|
|
a500_ec_client_pm_off = client;
|
|
|
|
|
|
|
|
err = register_restart_handler(&a500_ec_restart_handler);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
if (!pm_power_off)
|
|
|
|
pm_power_off = a500_ec_poweroff;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2022-08-15 04:02:30 -04:00
|
|
|
static void a500_ec_remove(struct i2c_client *client)
|
2020-12-28 11:05:46 -05:00
|
|
|
{
|
|
|
|
if (of_device_is_system_power_controller(client->dev.of_node)) {
|
|
|
|
if (pm_power_off == a500_ec_poweroff)
|
|
|
|
pm_power_off = NULL;
|
|
|
|
|
|
|
|
unregister_restart_handler(&a500_ec_restart_handler);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct of_device_id a500_ec_match[] = {
|
|
|
|
{ .compatible = "acer,a500-iconia-ec" },
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, a500_ec_match);
|
|
|
|
|
|
|
|
static struct i2c_driver a500_ec_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "acer-a500-embedded-controller",
|
|
|
|
.of_match_table = a500_ec_match,
|
|
|
|
},
|
2023-05-15 14:27:52 -04:00
|
|
|
.probe = a500_ec_probe,
|
2020-12-28 11:05:46 -05:00
|
|
|
.remove = a500_ec_remove,
|
|
|
|
};
|
|
|
|
module_i2c_driver(a500_ec_driver);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("Acer Iconia Tab A500 Embedded Controller driver");
|
|
|
|
MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>");
|
|
|
|
MODULE_LICENSE("GPL");
|