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Ricoh RN5T618 is a power management IC which integrates 3 step-down DCDC converters, 7 low-dropout regulators, a Li-ion battery charger, fuel gauge, ADC, GPIOs and a watchdog timer. This commit adds a MFD core driver to support the I2C communication with the device. Signed-off-by: Beniamino Galvani <b.galvani@gmail.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
/*
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* MFD core driver for Ricoh RN5T618 PMIC
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*
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* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/rn5t618.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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static const struct mfd_cell rn5t618_cells[] = {
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{ .name = "rn5t618-regulator" },
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{ .name = "rn5t618-wdt" },
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};
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static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case RN5T618_WATCHDOGCNT:
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case RN5T618_DCIRQ:
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case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
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case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
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case RN5T618_IR_GPR:
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case RN5T618_IR_GPF:
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case RN5T618_MON_IOIN:
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case RN5T618_INTMON:
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return true;
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default:
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return false;
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}
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}
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static const struct regmap_config rn5t618_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = rn5t618_volatile_reg,
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.max_register = RN5T618_MAX_REG,
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.cache_type = REGCACHE_RBTREE,
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};
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static struct rn5t618 *rn5t618_pm_power_off;
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static void rn5t618_power_off(void)
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{
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/* disable automatic repower-on */
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regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
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RN5T618_REPCNT_REPWRON, 0);
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/* start power-off sequence */
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regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
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RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
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}
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static int rn5t618_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct rn5t618 *priv;
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int ret;
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priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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i2c_set_clientdata(i2c, priv);
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priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
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if (IS_ERR(priv->regmap)) {
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ret = PTR_ERR(priv->regmap);
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dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
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return ret;
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}
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ret = mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
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ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
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if (ret) {
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dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
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return ret;
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}
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if (!pm_power_off) {
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rn5t618_pm_power_off = priv;
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pm_power_off = rn5t618_power_off;
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}
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return 0;
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}
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static int rn5t618_i2c_remove(struct i2c_client *i2c)
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{
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struct rn5t618 *priv = i2c_get_clientdata(i2c);
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if (priv == rn5t618_pm_power_off) {
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rn5t618_pm_power_off = NULL;
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pm_power_off = NULL;
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}
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mfd_remove_devices(&i2c->dev);
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return 0;
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}
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static const struct of_device_id rn5t618_of_match[] = {
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{ .compatible = "ricoh,rn5t618" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, rn5t618_of_match);
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static const struct i2c_device_id rn5t618_i2c_id[] = {
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
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static struct i2c_driver rn5t618_i2c_driver = {
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.driver = {
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.name = "rn5t618",
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.of_match_table = of_match_ptr(rn5t618_of_match),
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},
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.probe = rn5t618_i2c_probe,
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.remove = rn5t618_i2c_remove,
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.id_table = rn5t618_i2c_id,
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};
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module_i2c_driver(rn5t618_i2c_driver);
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MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
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MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver");
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MODULE_LICENSE("GPL v2");
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