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 
35 struct 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 
50 struct rc5t583_regulator {
51 	struct rc5t583_regulator_info *reg_info;
52 	struct regulator_dev	*rdev;
53 };
54 
55 static 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 
64 static const 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 
101 static 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 
118 static 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 
161 skip_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 
179 static struct platform_driver rc5t583_regulator_driver = {
180 	.driver	= {
181 		.name	= "rc5t583-regulator",
182 	},
183 	.probe		= rc5t583_regulator_probe,
184 };
185 
186 static int __init rc5t583_regulator_init(void)
187 {
188 	return platform_driver_register(&rc5t583_regulator_driver);
189 }
190 subsys_initcall(rc5t583_regulator_init);
191 
192 static void __exit rc5t583_regulator_exit(void)
193 {
194 	platform_driver_unregister(&rc5t583_regulator_driver);
195 }
196 module_exit(rc5t583_regulator_exit);
197 
198 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
199 MODULE_DESCRIPTION("RC5T583 regulator driver");
200 MODULE_ALIAS("platform:rc5t583-regulator");
201 MODULE_LICENSE("GPL v2");
202