GNU Linux-libre 5.10.219-gnu1
[releases.git] / drivers / regulator / rc5t583-regulator.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Regulator driver for RICOH RC5T583 power management chip.
4  *
5  * Copyright (c) 2011-2012, NVIDIA CORPORATION.  All rights reserved.
6  * Author: Laxman dewangan <ldewangan@nvidia.com>
7  *
8  * based on code
9  *      Copyright (C) 2011 RICOH COMPANY,LTD
10  */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/slab.h>
15 #include <linux/err.h>
16 #include <linux/platform_device.h>
17 #include <linux/regulator/driver.h>
18 #include <linux/regulator/machine.h>
19 #include <linux/gpio.h>
20 #include <linux/mfd/rc5t583.h>
21
22 struct rc5t583_regulator_info {
23         int                     deepsleep_id;
24
25         /* Regulator register address.*/
26         uint8_t                 reg_disc_reg;
27         uint8_t                 disc_bit;
28         uint8_t                 deepsleep_reg;
29
30         /* Regulator specific turn-on delay  and voltage settling time*/
31         int                     enable_uv_per_us;
32
33         /* Used by regulator core */
34         struct regulator_desc   desc;
35 };
36
37 static int rc5t583_regulator_enable_time(struct regulator_dev *rdev)
38 {
39         struct rc5t583_regulator_info *reg_info = rdev_get_drvdata(rdev);
40         int vsel = regulator_get_voltage_sel_regmap(rdev);
41         int curr_uV = regulator_list_voltage_linear(rdev, vsel);
42
43         return DIV_ROUND_UP(curr_uV, reg_info->enable_uv_per_us);
44 }
45
46 static const struct regulator_ops rc5t583_ops = {
47         .is_enabled             = regulator_is_enabled_regmap,
48         .enable                 = regulator_enable_regmap,
49         .disable                = regulator_disable_regmap,
50         .enable_time            = rc5t583_regulator_enable_time,
51         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
52         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
53         .list_voltage           = regulator_list_voltage_linear,
54         .map_voltage            = regulator_map_voltage_linear,
55         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
56 };
57
58 #define RC5T583_REG(_id, _en_reg, _en_bit, _disc_reg, _disc_bit, \
59                 _vout_mask, _min_mv, _max_mv, _step_uV, _enable_mv) \
60 {                                                               \
61         .reg_disc_reg   = RC5T583_REG_##_disc_reg,              \
62         .disc_bit       = _disc_bit,                            \
63         .deepsleep_reg  = RC5T583_REG_##_id##DAC_DS,            \
64         .enable_uv_per_us = _enable_mv * 1000,                  \
65         .deepsleep_id   = RC5T583_DS_##_id,                     \
66         .desc = {                                               \
67                 .name = "rc5t583-regulator-"#_id,               \
68                 .id = RC5T583_REGULATOR_##_id,                  \
69                 .n_voltages = (_max_mv - _min_mv) * 1000 / _step_uV + 1, \
70                 .ops = &rc5t583_ops,                            \
71                 .type = REGULATOR_VOLTAGE,                      \
72                 .owner = THIS_MODULE,                           \
73                 .vsel_reg = RC5T583_REG_##_id##DAC,             \
74                 .vsel_mask = _vout_mask,                        \
75                 .enable_reg = RC5T583_REG_##_en_reg,            \
76                 .enable_mask = BIT(_en_bit),                    \
77                 .min_uV = _min_mv * 1000,                       \
78                 .uV_step = _step_uV,                            \
79                 .ramp_delay = 40 * 1000,                        \
80         },                                                      \
81 }
82
83 static struct rc5t583_regulator_info rc5t583_reg_info[RC5T583_REGULATOR_MAX] = {
84         RC5T583_REG(DC0, DC0CTL, 0, DC0CTL, 1, 0x7F, 700, 1500, 12500, 4),
85         RC5T583_REG(DC1, DC1CTL, 0, DC1CTL, 1, 0x7F, 700, 1500, 12500, 14),
86         RC5T583_REG(DC2, DC2CTL, 0, DC2CTL, 1, 0x7F, 900, 2400, 12500, 14),
87         RC5T583_REG(DC3, DC3CTL, 0, DC3CTL, 1, 0x7F, 900, 2400, 12500, 14),
88         RC5T583_REG(LDO0, LDOEN2, 0, LDODIS2, 0, 0x7F, 900, 3400, 25000, 160),
89         RC5T583_REG(LDO1, LDOEN2, 1, LDODIS2, 1, 0x7F, 900, 3400, 25000, 160),
90         RC5T583_REG(LDO2, LDOEN2, 2, LDODIS2, 2, 0x7F, 900, 3400, 25000, 160),
91         RC5T583_REG(LDO3, LDOEN2, 3, LDODIS2, 3, 0x7F, 900, 3400, 25000, 160),
92         RC5T583_REG(LDO4, LDOEN2, 4, LDODIS2, 4, 0x3F, 750, 1500, 12500, 133),
93         RC5T583_REG(LDO5, LDOEN2, 5, LDODIS2, 5, 0x7F, 900, 3400, 25000, 267),
94         RC5T583_REG(LDO6, LDOEN2, 6, LDODIS2, 6, 0x7F, 900, 3400, 25000, 133),
95         RC5T583_REG(LDO7, LDOEN2, 7, LDODIS2, 7, 0x7F, 900, 3400, 25000, 233),
96         RC5T583_REG(LDO8, LDOEN1, 0, LDODIS1, 0, 0x7F, 900, 3400, 25000, 233),
97         RC5T583_REG(LDO9, LDOEN1, 1, LDODIS1, 1, 0x7F, 900, 3400, 25000, 133),
98 };
99
100 static int rc5t583_regulator_probe(struct platform_device *pdev)
101 {
102         struct rc5t583 *rc5t583 = dev_get_drvdata(pdev->dev.parent);
103         struct rc5t583_platform_data *pdata = dev_get_platdata(rc5t583->dev);
104         struct regulator_config config = { };
105         struct regulator_dev *rdev;
106         struct rc5t583_regulator_info *ri;
107         int ret;
108         int id;
109
110         if (!pdata) {
111                 dev_err(&pdev->dev, "No platform data, exiting...\n");
112                 return -ENODEV;
113         }
114
115         for (id = 0; id < RC5T583_REGULATOR_MAX; ++id) {
116                 ri = &rc5t583_reg_info[id];
117
118                 if (ri->deepsleep_id == RC5T583_DS_NONE)
119                         goto skip_ext_pwr_config;
120
121                 ret = rc5t583_ext_power_req_config(rc5t583->dev,
122                                 ri->deepsleep_id,
123                                 pdata->regulator_ext_pwr_control[id],
124                                 pdata->regulator_deepsleep_slot[id]);
125                 /*
126                  * Configuring external control is not a major issue,
127                  * just give warning.
128                  */
129                 if (ret < 0)
130                         dev_warn(&pdev->dev,
131                                 "Failed to configure ext control %d\n", id);
132
133 skip_ext_pwr_config:
134                 config.dev = &pdev->dev;
135                 config.init_data = pdata->reg_init_data[id];
136                 config.driver_data = ri;
137                 config.regmap = rc5t583->regmap;
138
139                 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
140                 if (IS_ERR(rdev)) {
141                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
142                                                 ri->desc.name);
143                         return PTR_ERR(rdev);
144                 }
145         }
146         return 0;
147 }
148
149 static struct platform_driver rc5t583_regulator_driver = {
150         .driver = {
151                 .name   = "rc5t583-regulator",
152         },
153         .probe          = rc5t583_regulator_probe,
154 };
155
156 static int __init rc5t583_regulator_init(void)
157 {
158         return platform_driver_register(&rc5t583_regulator_driver);
159 }
160 subsys_initcall(rc5t583_regulator_init);
161
162 static void __exit rc5t583_regulator_exit(void)
163 {
164         platform_driver_unregister(&rc5t583_regulator_driver);
165 }
166 module_exit(rc5t583_regulator_exit);
167
168 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
169 MODULE_DESCRIPTION("RC5T583 regulator driver");
170 MODULE_ALIAS("platform:rc5t583-regulator");
171 MODULE_LICENSE("GPL v2");