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mfd: rohm-bd71828: Add power off functionality

Browse Source 
Since the chip can power off the system, add the corresponding
functionality.
Based on https://github.com/kobolabs/Kobo-Reader/raw/master/hw/imx6sll-clara2e/kernel.tar.bz2

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Acked-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/20240402111700.494004-3-andreas@kemnade.info
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Andreas Kemnade 2024-04-02 13:17:00 +02:00 committed by Lee Jones
parent 714ae2ab78
commit 5549eeedcd
2 changed files with 38 additions and 1 deletions
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36
drivers/mfd/rohm-bd71828.c
View File

@ -464,6 +464,27 @@ static int set_clk_mode(struct device *dev, struct regmap *regmap,
OUT32K_MODE_CMOS);
}
static struct i2c_client *bd71828_dev;
static void bd71828_power_off(void)
{
while (true) {
s32 val;
/* We are not allowed to sleep, so do not use regmap involving mutexes here. */
val = i2c_smbus_read_byte_data(bd71828_dev, BD71828_REG_PS_CTRL_1);
if (val >= 0)
i2c_smbus_write_byte_data(bd71828_dev,
BD71828_REG_PS_CTRL_1,
BD71828_MASK_STATE_HBNT | (u8)val);
mdelay(500);
}
}
static void bd71828_remove_poweroff(void *data)
{
pm_power_off = NULL;
}
static int bd71828_i2c_probe(struct i2c_client *i2c)
{
struct regmap_irq_chip_data *irq_data;
@ -542,7 +563,20 @@ static int bd71828_i2c_probe(struct i2c_client *i2c)
ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO, mfd, cells,
NULL, 0, regmap_irq_get_domain(irq_data));
if (ret)
dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
return dev_err_probe(&i2c->dev, ret, "Failed to create subdevices\n");
if (of_device_is_system_power_controller(i2c->dev.of_node) &&
chip_type == ROHM_CHIP_TYPE_BD71828) {
if (!pm_power_off) {
bd71828_dev = i2c;
pm_power_off = bd71828_power_off;
ret = devm_add_action_or_reset(&i2c->dev,
bd71828_remove_poweroff,
NULL);
} else {
dev_warn(&i2c->dev, "Poweroff callback already assigned\n");
}
}
return ret;
}

3
include/linux/mfd/rohm-bd71828.h
View File

@ -4,6 +4,7 @@
#ifndef __LINUX_MFD_BD71828_H__
#define __LINUX_MFD_BD71828_H__
#include <linux/bits.h>
#include <linux/mfd/rohm-generic.h>
#include <linux/mfd/rohm-shared.h>
@ -41,6 +42,8 @@ enum {
#define BD71828_REG_PS_CTRL_2 0x05
#define BD71828_REG_PS_CTRL_3 0x06
#define BD71828_MASK_STATE_HBNT BIT(1)
//#define BD71828_REG_SWRESET 0x06
#define BD71828_MASK_RUN_LVL_CTRL 0x30