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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, \ | |
4335f653 | 23 | _delay, _lr, _cr) \ |
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24 | [_id] = { \ |
25 | .desc = { \ | |
26 | .name = _name, \ | |
27 | .id = _id, \ | |
28 | .of_match = of_match_ptr(_of), \ | |
29 | .regulators_node = of_match_ptr("regulators"),\ | |
30 | .ops = &_ops, \ | |
31 | .n_voltages = _n, \ | |
32 | .type = REGULATOR_VOLTAGE, \ | |
33 | .owner = THIS_MODULE, \ | |
34 | .vsel_reg = _vr, \ | |
35 | .vsel_mask = _vm, \ | |
36 | .enable_reg = _er, \ | |
37 | .enable_mask = _em, \ | |
38 | .ramp_delay = _delay, \ | |
39 | .linear_ranges = _lr, \ | |
4335f653 | 40 | .n_linear_ranges = ARRAY_SIZE(_lr), \ |
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41 | }, \ |
42 | .ctrl2_reg = _cr, \ | |
43 | } | |
44 | ||
45 | struct lp873x_regulator { | |
46 | struct regulator_desc desc; | |
47 | unsigned int ctrl2_reg; | |
48 | }; | |
49 | ||
50 | static const struct lp873x_regulator regulators[]; | |
51 | ||
52 | static const struct regulator_linear_range buck0_buck1_ranges[] = { | |
53 | REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0), | |
54 | REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000), | |
55 | REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000), | |
56 | REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000), | |
57 | }; | |
58 | ||
59 | static const struct regulator_linear_range ldo0_ldo1_ranges[] = { | |
60 | REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000), | |
61 | }; | |
62 | ||
63 | static unsigned int lp873x_buck_ramp_delay[] = { | |
64 | 30000, 15000, 10000, 7500, 3800, 1900, 940, 470 | |
65 | }; | |
66 | ||
67 | /* LP873X BUCK current limit */ | |
68 | static const unsigned int lp873x_buck_uA[] = { | |
69 | 1500000, 2000000, 2500000, 3000000, 3500000, 4000000, | |
70 | }; | |
71 | ||
72 | static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev, | |
73 | int ramp_delay) | |
74 | { | |
75 | int id = rdev_get_id(rdev); | |
76 | struct lp873x *lp873 = rdev_get_drvdata(rdev); | |
77 | unsigned int reg; | |
78 | int ret; | |
79 | ||
80 | if (ramp_delay <= 470) | |
81 | reg = 7; | |
82 | else if (ramp_delay <= 940) | |
83 | reg = 6; | |
84 | else if (ramp_delay <= 1900) | |
85 | reg = 5; | |
86 | else if (ramp_delay <= 3800) | |
87 | reg = 4; | |
88 | else if (ramp_delay <= 7500) | |
89 | reg = 3; | |
90 | else if (ramp_delay <= 10000) | |
91 | reg = 2; | |
92 | else if (ramp_delay <= 15000) | |
93 | reg = 1; | |
94 | else | |
95 | reg = 0; | |
96 | ||
97 | ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg, | |
98 | LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE, | |
99 | reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE)); | |
100 | if (ret) { | |
101 | dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg]; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int lp873x_buck_set_current_limit(struct regulator_dev *rdev, | |
111 | int min_uA, int max_uA) | |
112 | { | |
113 | int id = rdev_get_id(rdev); | |
114 | struct lp873x *lp873 = rdev_get_drvdata(rdev); | |
115 | int i; | |
116 | ||
117 | for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) { | |
118 | if (lp873x_buck_uA[i] >= min_uA && | |
119 | lp873x_buck_uA[i] <= max_uA) | |
120 | return regmap_update_bits(lp873->regmap, | |
121 | regulators[id].ctrl2_reg, | |
122 | LP873X_BUCK0_CTRL_2_BUCK0_ILIM, | |
123 | i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM)); | |
124 | } | |
125 | ||
126 | return -EINVAL; | |
127 | } | |
128 | ||
129 | static int lp873x_buck_get_current_limit(struct regulator_dev *rdev) | |
130 | { | |
131 | int id = rdev_get_id(rdev); | |
132 | struct lp873x *lp873 = rdev_get_drvdata(rdev); | |
133 | int ret; | |
134 | unsigned int val; | |
135 | ||
136 | ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val); | |
137 | if (ret) | |
138 | return ret; | |
139 | ||
140 | val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >> | |
141 | __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM); | |
142 | ||
143 | return (val < ARRAY_SIZE(lp873x_buck_uA)) ? | |
144 | lp873x_buck_uA[val] : -EINVAL; | |
145 | } | |
146 | ||
147 | /* Operations permitted on BUCK0, BUCK1 */ | |
148 | static struct regulator_ops lp873x_buck01_ops = { | |
149 | .is_enabled = regulator_is_enabled_regmap, | |
150 | .enable = regulator_enable_regmap, | |
151 | .disable = regulator_disable_regmap, | |
152 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
153 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
154 | .list_voltage = regulator_list_voltage_linear_range, | |
155 | .map_voltage = regulator_map_voltage_linear_range, | |
156 | .set_voltage_time_sel = regulator_set_voltage_time_sel, | |
157 | .set_ramp_delay = lp873x_buck_set_ramp_delay, | |
158 | .set_current_limit = lp873x_buck_set_current_limit, | |
159 | .get_current_limit = lp873x_buck_get_current_limit, | |
160 | }; | |
161 | ||
162 | /* Operations permitted on LDO0 and LDO1 */ | |
163 | static struct regulator_ops lp873x_ldo01_ops = { | |
164 | .is_enabled = regulator_is_enabled_regmap, | |
165 | .enable = regulator_enable_regmap, | |
166 | .disable = regulator_disable_regmap, | |
167 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
168 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
169 | .list_voltage = regulator_list_voltage_linear_range, | |
170 | .map_voltage = regulator_map_voltage_linear_range, | |
171 | }; | |
172 | ||
173 | static const struct lp873x_regulator regulators[] = { | |
174 | LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops, | |
175 | 256, LP873X_REG_BUCK0_VOUT, | |
176 | LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1, | |
177 | LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000, | |
4335f653 | 178 | buck0_buck1_ranges, LP873X_REG_BUCK0_CTRL_2), |
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179 | LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops, |
180 | 256, LP873X_REG_BUCK1_VOUT, | |
181 | LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1, | |
182 | LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000, | |
4335f653 | 183 | buck0_buck1_ranges, LP873X_REG_BUCK1_CTRL_2), |
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184 | LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26, |
185 | LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET, | |
186 | LP873X_REG_LDO0_CTRL, | |
4335f653 | 187 | LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 0xFF), |
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188 | LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26, |
189 | LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET, | |
190 | LP873X_REG_LDO1_CTRL, | |
4335f653 | 191 | LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 0xFF), |
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192 | }; |
193 | ||
194 | static int lp873x_regulator_probe(struct platform_device *pdev) | |
195 | { | |
196 | struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent); | |
197 | struct regulator_config config = { }; | |
198 | struct regulator_dev *rdev; | |
199 | int i; | |
200 | ||
201 | platform_set_drvdata(pdev, lp873); | |
202 | ||
203 | config.dev = &pdev->dev; | |
204 | config.dev->of_node = lp873->dev->of_node; | |
205 | config.driver_data = lp873; | |
206 | config.regmap = lp873->regmap; | |
207 | ||
208 | for (i = 0; i < ARRAY_SIZE(regulators); i++) { | |
209 | rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc, | |
210 | &config); | |
211 | if (IS_ERR(rdev)) { | |
212 | dev_err(lp873->dev, "failed to register %s regulator\n", | |
213 | pdev->name); | |
214 | return PTR_ERR(rdev); | |
215 | } | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static const struct platform_device_id lp873x_regulator_id_table[] = { | |
222 | { "lp873x-regulator", }, | |
223 | { /* sentinel */ } | |
224 | }; | |
225 | MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table); | |
226 | ||
227 | static struct platform_driver lp873x_regulator_driver = { | |
228 | .driver = { | |
229 | .name = "lp873x-pmic", | |
230 | }, | |
231 | .probe = lp873x_regulator_probe, | |
232 | .id_table = lp873x_regulator_id_table, | |
233 | }; | |
234 | module_platform_driver(lp873x_regulator_driver); | |
235 | ||
236 | MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>"); | |
237 | MODULE_DESCRIPTION("LP873X voltage regulator driver"); | |
238 | MODULE_ALIAS("platform:lp873x-pmic"); | |
239 | MODULE_LICENSE("GPL v2"); |