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134 lines
3.2 KiB
134 lines
3.2 KiB
/* |
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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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