Merge tag 'iio-for-4.11b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[linux-2.6-microblaze.git] / drivers / regulator / lp873x-regulator.c
1 /*
2  * Regulator driver for LP873X PMIC
3  *
4  * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
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 version 2 as
8  * published by the Free Software Foundation.
9  *
10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11  * kind, whether expressed or implied; without even the implied warranty
12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License version 2 for more details.
14  */
15
16 #include <linux/module.h>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19
20 #include <linux/mfd/lp873x.h>
21
22 #define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
23                          _delay, _lr, _cr)                              \
24         [_id] = {                                                       \
25                 .desc = {                                               \
26                         .name                   = _name,                \
27                         .supply_name            = _of "-in",            \
28                         .id                     = _id,                  \
29                         .of_match               = of_match_ptr(_of),    \
30                         .regulators_node        = of_match_ptr("regulators"),\
31                         .ops                    = &_ops,                \
32                         .n_voltages             = _n,                   \
33                         .type                   = REGULATOR_VOLTAGE,    \
34                         .owner                  = THIS_MODULE,          \
35                         .vsel_reg               = _vr,                  \
36                         .vsel_mask              = _vm,                  \
37                         .enable_reg             = _er,                  \
38                         .enable_mask            = _em,                  \
39                         .ramp_delay             = _delay,               \
40                         .linear_ranges          = _lr,                  \
41                         .n_linear_ranges        = ARRAY_SIZE(_lr),      \
42                 },                                                      \
43                 .ctrl2_reg = _cr,                                       \
44         }
45
46 struct lp873x_regulator {
47         struct regulator_desc desc;
48         unsigned int ctrl2_reg;
49 };
50
51 static const struct lp873x_regulator regulators[];
52
53 static const struct regulator_linear_range buck0_buck1_ranges[] = {
54         REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
55         REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
56         REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
57         REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
58 };
59
60 static const struct regulator_linear_range ldo0_ldo1_ranges[] = {
61         REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
62 };
63
64 static unsigned int lp873x_buck_ramp_delay[] = {
65         30000, 15000, 10000, 7500, 3800, 1900, 940, 470
66 };
67
68 /* LP873X BUCK current limit */
69 static const unsigned int lp873x_buck_uA[] = {
70         1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
71 };
72
73 static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
74                                       int ramp_delay)
75 {
76         int id = rdev_get_id(rdev);
77         struct lp873x *lp873 = rdev_get_drvdata(rdev);
78         unsigned int reg;
79         int ret;
80
81         if (ramp_delay <= 470)
82                 reg = 7;
83         else if (ramp_delay <= 940)
84                 reg = 6;
85         else if (ramp_delay <= 1900)
86                 reg = 5;
87         else if (ramp_delay <= 3800)
88                 reg = 4;
89         else if (ramp_delay <= 7500)
90                 reg = 3;
91         else if (ramp_delay <= 10000)
92                 reg = 2;
93         else if (ramp_delay <= 15000)
94                 reg = 1;
95         else
96                 reg = 0;
97
98         ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
99                                  LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
100                                  reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
101         if (ret) {
102                 dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
103                 return ret;
104         }
105
106         rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
107
108         return 0;
109 }
110
111 static int lp873x_buck_set_current_limit(struct regulator_dev *rdev,
112                                          int min_uA, int max_uA)
113 {
114         int id = rdev_get_id(rdev);
115         struct lp873x *lp873 = rdev_get_drvdata(rdev);
116         int i;
117
118         for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) {
119                 if (lp873x_buck_uA[i] >= min_uA &&
120                     lp873x_buck_uA[i] <= max_uA)
121                         return regmap_update_bits(lp873->regmap,
122                                                   regulators[id].ctrl2_reg,
123                                                   LP873X_BUCK0_CTRL_2_BUCK0_ILIM,
124                                                   i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM));
125         }
126
127         return -EINVAL;
128 }
129
130 static int lp873x_buck_get_current_limit(struct regulator_dev *rdev)
131 {
132         int id = rdev_get_id(rdev);
133         struct lp873x *lp873 = rdev_get_drvdata(rdev);
134         int ret;
135         unsigned int val;
136
137         ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val);
138         if (ret)
139                 return ret;
140
141         val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >>
142                __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM);
143
144         return (val < ARRAY_SIZE(lp873x_buck_uA)) ?
145                         lp873x_buck_uA[val] : -EINVAL;
146 }
147
148 /* Operations permitted on BUCK0, BUCK1 */
149 static struct regulator_ops lp873x_buck01_ops = {
150         .is_enabled             = regulator_is_enabled_regmap,
151         .enable                 = regulator_enable_regmap,
152         .disable                = regulator_disable_regmap,
153         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
154         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
155         .list_voltage           = regulator_list_voltage_linear_range,
156         .map_voltage            = regulator_map_voltage_linear_range,
157         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
158         .set_ramp_delay         = lp873x_buck_set_ramp_delay,
159         .set_current_limit      = lp873x_buck_set_current_limit,
160         .get_current_limit      = lp873x_buck_get_current_limit,
161 };
162
163 /* Operations permitted on LDO0 and LDO1 */
164 static struct regulator_ops lp873x_ldo01_ops = {
165         .is_enabled             = regulator_is_enabled_regmap,
166         .enable                 = regulator_enable_regmap,
167         .disable                = regulator_disable_regmap,
168         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
169         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
170         .list_voltage           = regulator_list_voltage_linear_range,
171         .map_voltage            = regulator_map_voltage_linear_range,
172 };
173
174 static const struct lp873x_regulator regulators[] = {
175         LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
176                          256, LP873X_REG_BUCK0_VOUT,
177                          LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
178                          LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
179                          buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2),
180         LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
181                          256, LP873X_REG_BUCK1_VOUT,
182                          LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
183                          LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
184                          buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2),
185         LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
186                          LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
187                          LP873X_REG_LDO0_CTRL,
188                          LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF),
189         LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
190                          LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
191                          LP873X_REG_LDO1_CTRL,
192                          LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF),
193 };
194
195 static int lp873x_regulator_probe(struct platform_device *pdev)
196 {
197         struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
198         struct regulator_config config = { };
199         struct regulator_dev *rdev;
200         int i;
201
202         platform_set_drvdata(pdev, lp873);
203
204         config.dev = &pdev->dev;
205         config.dev->of_node = lp873->dev->of_node;
206         config.driver_data = lp873;
207         config.regmap = lp873->regmap;
208
209         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
210                 rdev = devm_regulator_register(&pdev->dev, &regulators[i].desc,
211                                                &config);
212                 if (IS_ERR(rdev)) {
213                         dev_err(lp873->dev, "failed to register %s regulator\n",
214                                 pdev->name);
215                         return PTR_ERR(rdev);
216                 }
217         }
218
219         return 0;
220 }
221
222 static const struct platform_device_id lp873x_regulator_id_table[] = {
223         { "lp873x-regulator", },
224         { /* sentinel */ }
225 };
226 MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
227
228 static struct platform_driver lp873x_regulator_driver = {
229         .driver = {
230                 .name = "lp873x-pmic",
231         },
232         .probe = lp873x_regulator_probe,
233         .id_table = lp873x_regulator_id_table,
234 };
235 module_platform_driver(lp873x_regulator_driver);
236
237 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
238 MODULE_DESCRIPTION("LP873X voltage regulator driver");
239 MODULE_ALIAS("platform:lp873x-pmic");
240 MODULE_LICENSE("GPL v2");