1/*
2 * Regulator driver for RICOH RC5T583 power management chip.
3 *
4 * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
5 * Author: Laxman dewangan <ldewangan@nvidia.com>
6 *
7 * based on code
8 *      Copyright (C) 2011 RICOH COMPANY,LTD
9 *
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms and conditions of the GNU General Public License,
13 * version 2, as published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
18 * more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
22 *
23 */
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/slab.h>
28#include <linux/err.h>
29#include <linux/platform_device.h>
30#include <linux/regulator/driver.h>
31#include <linux/regulator/machine.h>
32#include <linux/gpio.h>
33#include <linux/mfd/rc5t583.h>
34
35struct rc5t583_regulator_info {
36	int			deepsleep_id;
37
38	/* Regulator register address.*/
39	uint8_t			reg_disc_reg;
40	uint8_t			disc_bit;
41	uint8_t			deepsleep_reg;
42
43	/* Regulator specific turn-on delay  and voltage settling time*/
44	int			enable_uv_per_us;
45
46	/* Used by regulator core */
47	struct regulator_desc	desc;
48};
49
50struct rc5t583_regulator {
51	struct rc5t583_regulator_info *reg_info;
52	struct regulator_dev	*rdev;
53};
54
55static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
56{
57	struct rc5t583_regulator *reg = rdev_get_drvdata(rdev);
58	int vsel = regulator_get_voltage_sel_regmap(rdev);
59	int curr_uV = regulator_list_voltage_linear(rdev, vsel);
60
61	return DIV_ROUND_UP(curr_uV, reg->reg_info->enable_uv_per_us);
62}
63
64static struct regulator_ops rc5t583_ops = {
65	.is_enabled		= regulator_is_enabled_regmap,
66	.enable			= regulator_enable_regmap,
67	.disable		= regulator_disable_regmap,
68	.enable_time		= rc5t583_regulator_enable_time,
69	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
70	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
71	.list_voltage		= regulator_list_voltage_linear,
72	.map_voltage		= regulator_map_voltage_linear,
73	.set_voltage_time_sel	= regulator_set_voltage_time_sel,
74};
75
76#define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
77		_vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
78{								\
79	.reg_disc_reg	= RC5T583_REG_##_disc_reg,		\
80	.disc_bit	= _disc_bit,				\
81	.deepsleep_reg	= RC5T583_REG_##_id##DAC_DS,		\
82	.enable_uv_per_us = _enable_mv * 1000,			\
83	.deepsleep_id	= RC5T583_DS_##_id,			\
84	.desc = {						\
85		.name = "rc5t583-regulator-"#_id,		\
86		.id = RC5T583_REGULATOR_##_id,			\
87		.n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
88		.ops = &rc5t583_ops,				\
89		.type = REGULATOR_VOLTAGE,			\
90		.owner = THIS_MODULE,				\
91		.vsel_reg = RC5T583_REG_##_id##DAC,		\
92		.vsel_mask = _vout_mask,			\
93		.enable_reg = RC5T583_REG_##_en_reg,		\
94		.enable_mask = BIT(_en_bit),			\
95		.min_uV	= _min_mv * 1000,			\
96		.uV_step = _step_uV,				\
97		.ramp_delay = 40 * 1000,			\
98	},							\
99}
100
101static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
102	RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
103	RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
104	RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
105	RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
106	RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
107	RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
108	RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
109	RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
110	RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
111	RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
112	RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
113	RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
114	RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
115	RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
116};
117
118static int rc5t583_regulator_probe(struct platform_device *pdev)
119{
120	struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
121	struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
122	struct regulator_config config = { };
123	struct rc5t583_regulator *reg = NULL;
124	struct rc5t583_regulator *regs;
125	struct regulator_dev *rdev;
126	struct rc5t583_regulator_info *ri;
127	int ret;
128	int id;
129
130	if (!pdata) {
131		dev_err(&pdev->dev, "No platform data, exiting...\n");
132		return -ENODEV;
133	}
134
135	regs = devm_kzalloc(&pdev->dev, RC5T583_REGULATOR_MAX *
136			sizeof(struct rc5t583_regulator), GFP_KERNEL);
137	if (!regs)
138		return -ENOMEM;
139
140
141	for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
142		reg = &regs[id];
143		ri = &rc5t583_reg_info[id];
144		reg->reg_info = ri;
145
146		if (ri->deepsleep_id == RC5T583_DS_NONE)
147			goto skip_ext_pwr_config;
148
149		ret = rc5t583_ext_power_req_config(rc5t583->dev,
150				ri->deepsleep_id,
151				pdata->regulator_ext_pwr_control[id],
152				pdata->regulator_deepsleep_slot[id]);
153		/*
154		 * Configuring external control is not a major issue,
155		 * just give warning.
156		 */
157		if (ret < 0)
158			dev_warn(&pdev->dev,
159				"Failed to configure ext control %d\n", id);
160
161skip_ext_pwr_config:
162		config.dev = &pdev->dev;
163		config.init_data = pdata->reg_init_data[id];
164		config.driver_data = reg;
165		config.regmap = rc5t583->regmap;
166
167		rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
168		if (IS_ERR(rdev)) {
169			dev_err(&pdev->dev, "Failed to register regulator %s\n",
170						ri->desc.name);
171			return PTR_ERR(rdev);
172		}
173		reg->rdev = rdev;
174	}
175	platform_set_drvdata(pdev, regs);
176	return 0;
177}
178
179static struct platform_driver rc5t583_regulator_driver = {
180	.driver	= {
181		.name	= "rc5t583-regulator",
182	},
183	.probe		= rc5t583_regulator_probe,
184};
185
186static int __init rc5t583_regulator_init(void)
187{
188	return platform_driver_register(&rc5t583_regulator_driver);
189}
190subsys_initcall(rc5t583_regulator_init);
191
192static void __exit rc5t583_regulator_exit(void)
193{
194	platform_driver_unregister(&rc5t583_regulator_driver);
195}
196module_exit(rc5t583_regulator_exit);
197
198MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
199MODULE_DESCRIPTION("RC5T583 regulator driver");
200MODULE_ALIAS("platform:rc5t583-regulator");
201MODULE_LICENSE("GPL v2");
202