diff options
Diffstat (limited to 'drivers/mfd/rn5t618.c')
| -rw-r--r-- | drivers/mfd/rn5t618.c | 70 |
1 files changed, 58 insertions, 12 deletions
diff --git a/drivers/mfd/rn5t618.c b/drivers/mfd/rn5t618.c index 0ad51d792feb..ee94080e1cbb 100644 --- a/drivers/mfd/rn5t618.c +++ b/drivers/mfd/rn5t618.c @@ -2,6 +2,7 @@ * MFD core driver for Ricoh RN5T618 PMIC * * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> + * Copyright (C) 2016 Toradex AG * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -11,10 +12,13 @@ * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#include <linux/delay.h> #include <linux/i2c.h> #include <linux/mfd/core.h> #include <linux/mfd/rn5t618.h> #include <linux/module.h> +#include <linux/of_device.h> +#include <linux/reboot.h> #include <linux/regmap.h> static const struct mfd_cell rn5t618_cells[] = { @@ -48,28 +52,64 @@ static const struct regmap_config rn5t618_regmap_config = { }; static struct rn5t618 *rn5t618_pm_power_off; +static struct notifier_block rn5t618_restart_handler; -static void rn5t618_power_off(void) +static void rn5t618_trigger_poweroff_sequence(bool repower) { /* disable automatic repower-on */ regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT, - RN5T618_REPCNT_REPWRON, 0); + RN5T618_REPCNT_REPWRON, + repower ? RN5T618_REPCNT_REPWRON : 0); /* start power-off sequence */ regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT, RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF); } +static void rn5t618_power_off(void) +{ + rn5t618_trigger_poweroff_sequence(false); +} + +static int rn5t618_restart(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + rn5t618_trigger_poweroff_sequence(true); + + /* + * Re-power factor detection on PMIC side is not instant. 1ms + * proved to be enough time until reset takes effect. + */ + mdelay(1); + + return NOTIFY_DONE; +} + +static const struct of_device_id rn5t618_of_match[] = { + { .compatible = "ricoh,rn5t567", .data = (void *)RN5T567 }, + { .compatible = "ricoh,rn5t618", .data = (void *)RN5T618 }, + { } +}; +MODULE_DEVICE_TABLE(of, rn5t618_of_match); + static int rn5t618_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { + const struct of_device_id *of_id; struct rn5t618 *priv; int ret; + of_id = of_match_device(rn5t618_of_match, &i2c->dev); + if (!of_id) { + dev_err(&i2c->dev, "Failed to find matching DT ID\n"); + return -EINVAL; + } + priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; i2c_set_clientdata(i2c, priv); + priv->variant = (long)of_id->data; priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config); if (IS_ERR(priv->regmap)) { @@ -85,9 +125,21 @@ static int rn5t618_i2c_probe(struct i2c_client *i2c, return ret; } - if (!pm_power_off) { - rn5t618_pm_power_off = priv; - pm_power_off = rn5t618_power_off; + rn5t618_pm_power_off = priv; + if (of_device_is_system_power_controller(i2c->dev.of_node)) { + if (!pm_power_off) + pm_power_off = rn5t618_power_off; + else + dev_warn(&i2c->dev, "Poweroff callback already assigned\n"); + } + + rn5t618_restart_handler.notifier_call = rn5t618_restart; + rn5t618_restart_handler.priority = 192; + + ret = register_restart_handler(&rn5t618_restart_handler); + if (ret) { + dev_err(&i2c->dev, "cannot register restart handler, %d\n", ret); + return ret; } return 0; @@ -105,12 +157,6 @@ static int rn5t618_i2c_remove(struct i2c_client *i2c) return 0; } -static const struct of_device_id rn5t618_of_match[] = { - { .compatible = "ricoh,rn5t618" }, - { } -}; -MODULE_DEVICE_TABLE(of, rn5t618_of_match); - static const struct i2c_device_id rn5t618_i2c_id[] = { { } }; @@ -129,5 +175,5 @@ static struct i2c_driver rn5t618_i2c_driver = { module_i2c_driver(rn5t618_i2c_driver); MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); -MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver"); +MODULE_DESCRIPTION("Ricoh RN5T567/618 MFD driver"); MODULE_LICENSE("GPL v2"); |