Git Repo - linux.git/blame_incremental

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Commit	Line	Data
	1	/*
	2	* MFD core driver for Ricoh RN5T618 PMIC
	3	*
	4	* Copyright (C) 2014 Beniamino Galvani <[email protected]>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* version 2 as published by the Free Software Foundation.
	9	*
	10	* You should have received a copy of the GNU General Public License
	11	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	12	*/
	13
	14	#include <linux/i2c.h>
	15	#include <linux/mfd/core.h>
	16	#include <linux/mfd/rn5t618.h>
	17	#include <linux/module.h>
	18	#include <linux/regmap.h>
	19
	20	static const struct mfd_cell rn5t618_cells[] = {
	21	{ .name = "rn5t618-regulator" },
	22	{ .name = "rn5t618-wdt" },
	23	};
	24
	25	static bool rn5t618_volatile_reg(struct device *dev, unsigned int reg)
	26	{
	27	switch (reg) {
	28	case RN5T618_WATCHDOGCNT:
	29	case RN5T618_DCIRQ:
	30	case RN5T618_ILIMDATAH ... RN5T618_AIN0DATAL:
	31	case RN5T618_IR_ADC1 ... RN5T618_IR_ADC3:
	32	case RN5T618_IR_GPR:
	33	case RN5T618_IR_GPF:
	34	case RN5T618_MON_IOIN:
	35	case RN5T618_INTMON:
	36	return true;
	37	default:
	38	return false;
	39	}
	40	}
	41
	42	static const struct regmap_config rn5t618_regmap_config = {
	43	.reg_bits = 8,
	44	.val_bits = 8,
	45	.volatile_reg = rn5t618_volatile_reg,
	46	.max_register = RN5T618_MAX_REG,
	47	.cache_type = REGCACHE_RBTREE,
	48	};
	49
	50	static struct rn5t618 *rn5t618_pm_power_off;
	51
	52	static void rn5t618_power_off(void)
	53	{
	54	/* disable automatic repower-on */
	55	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_REPCNT,
	56	RN5T618_REPCNT_REPWRON, 0);
	57	/* start power-off sequence */
	58	regmap_update_bits(rn5t618_pm_power_off->regmap, RN5T618_SLPCNT,
	59	RN5T618_SLPCNT_SWPWROFF, RN5T618_SLPCNT_SWPWROFF);
	60	}
	61
	62	static int rn5t618_i2c_probe(struct i2c_client *i2c,
	63	const struct i2c_device_id *id)
	64	{
	65	struct rn5t618 *priv;
	66	int ret;
	67
	68	priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL);
	69	if (!priv)
	70	return -ENOMEM;
	71
	72	i2c_set_clientdata(i2c, priv);
	73
	74	priv->regmap = devm_regmap_init_i2c(i2c, &rn5t618_regmap_config);
	75	if (IS_ERR(priv->regmap)) {
	76	ret = PTR_ERR(priv->regmap);
	77	dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
	78	return ret;
	79	}
	80
	81	ret = devm_mfd_add_devices(&i2c->dev, -1, rn5t618_cells,
	82	ARRAY_SIZE(rn5t618_cells), NULL, 0, NULL);
	83	if (ret) {
	84	dev_err(&i2c->dev, "failed to add sub-devices: %d\n", ret);
	85	return ret;
	86	}
	87
	88	if (!pm_power_off) {
	89	rn5t618_pm_power_off = priv;
	90	pm_power_off = rn5t618_power_off;
	91	}
	92
	93	return 0;
	94	}
	95
	96	static int rn5t618_i2c_remove(struct i2c_client *i2c)
	97	{
	98	struct rn5t618 *priv = i2c_get_clientdata(i2c);
	99
	100	if (priv == rn5t618_pm_power_off) {
	101	rn5t618_pm_power_off = NULL;
	102	pm_power_off = NULL;
	103	}
	104
	105	return 0;
	106	}
	107
	108	static const struct of_device_id rn5t618_of_match[] = {
	109	{ .compatible = "ricoh,rn5t618" },
	110	{ }
	111	};
	112	MODULE_DEVICE_TABLE(of, rn5t618_of_match);
	113
	114	static const struct i2c_device_id rn5t618_i2c_id[] = {
	115	{ }
	116	};
	117	MODULE_DEVICE_TABLE(i2c, rn5t618_i2c_id);
	118
	119	static struct i2c_driver rn5t618_i2c_driver = {
	120	.driver = {
	121	.name = "rn5t618",
	122	.of_match_table = of_match_ptr(rn5t618_of_match),
	123	},
	124	.probe = rn5t618_i2c_probe,
	125	.remove = rn5t618_i2c_remove,
	126	.id_table = rn5t618_i2c_id,
	127	};
	128
	129	module_i2c_driver(rn5t618_i2c_driver);
	130
	131	MODULE_AUTHOR("Beniamino Galvani <[email protected]>");
	132	MODULE_DESCRIPTION("Ricoh RN5T618 MFD driver");
	133	MODULE_LICENSE("GPL v2");