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16f10918 ST |
1 | /* |
2 | * da9210-regulator.c - Regulator device driver for DA9210 | |
3 | * Copyright (C) 2013 Dialog Semiconductor Ltd. | |
4 | * | |
5 | * This library is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU Library General Public | |
7 | * License as published by the Free Software Foundation; either | |
8 | * version 2 of the License, or (at your option) any later version. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Library General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Library General Public | |
16 | * License along with this library; if not, write to the | |
17 | * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, | |
18 | * Boston, MA 02110-1301, USA. | |
19 | */ | |
20 | ||
21 | #include <linux/err.h> | |
22 | #include <linux/i2c.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/regulator/driver.h> | |
27 | #include <linux/regulator/machine.h> | |
937433c2 | 28 | #include <linux/regulator/of_regulator.h> |
16f10918 ST |
29 | #include <linux/regmap.h> |
30 | ||
31 | #include "da9210-regulator.h" | |
32 | ||
33 | struct da9210 { | |
34 | struct regulator_dev *rdev; | |
35 | struct regmap *regmap; | |
36 | }; | |
37 | ||
38 | static const struct regmap_config da9210_regmap_config = { | |
39 | .reg_bits = 8, | |
40 | .val_bits = 8, | |
41 | }; | |
42 | ||
43 | static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, | |
44 | int max_uA); | |
45 | static int da9210_get_current_limit(struct regulator_dev *rdev); | |
46 | ||
47 | static struct regulator_ops da9210_buck_ops = { | |
48 | .enable = regulator_enable_regmap, | |
49 | .disable = regulator_disable_regmap, | |
50 | .is_enabled = regulator_is_enabled_regmap, | |
51 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
52 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
53 | .list_voltage = regulator_list_voltage_linear, | |
54 | .set_current_limit = da9210_set_current_limit, | |
55 | .get_current_limit = da9210_get_current_limit, | |
56 | }; | |
57 | ||
58 | /* Default limits measured in millivolts and milliamps */ | |
59 | #define DA9210_MIN_MV 300 | |
60 | #define DA9210_MAX_MV 1570 | |
61 | #define DA9210_STEP_MV 10 | |
62 | ||
63 | /* Current limits for buck (uA) indices corresponds with register values */ | |
64 | static const int da9210_buck_limits[] = { | |
65 | 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, | |
66 | 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 | |
67 | }; | |
68 | ||
69 | static const struct regulator_desc da9210_reg = { | |
70 | .name = "DA9210", | |
71 | .id = 0, | |
72 | .ops = &da9210_buck_ops, | |
73 | .type = REGULATOR_VOLTAGE, | |
74 | .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, | |
75 | .min_uV = (DA9210_MIN_MV * 1000), | |
76 | .uV_step = (DA9210_STEP_MV * 1000), | |
77 | .vsel_reg = DA9210_REG_VBUCK_A, | |
78 | .vsel_mask = DA9210_VBUCK_MASK, | |
79 | .enable_reg = DA9210_REG_BUCK_CONT, | |
80 | .enable_mask = DA9210_BUCK_EN, | |
81 | .owner = THIS_MODULE, | |
82 | }; | |
83 | ||
84 | static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, | |
85 | int max_uA) | |
86 | { | |
87 | struct da9210 *chip = rdev_get_drvdata(rdev); | |
88 | unsigned int sel; | |
89 | int i; | |
90 | ||
91 | /* search for closest to maximum */ | |
92 | for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) { | |
93 | if (min_uA <= da9210_buck_limits[i] && | |
94 | max_uA >= da9210_buck_limits[i]) { | |
95 | sel = i; | |
96 | sel = sel << DA9210_BUCK_ILIM_SHIFT; | |
97 | return regmap_update_bits(chip->regmap, | |
98 | DA9210_REG_BUCK_ILIM, | |
99 | DA9210_BUCK_ILIM_MASK, sel); | |
100 | } | |
101 | } | |
102 | ||
103 | return -EINVAL; | |
104 | } | |
105 | ||
106 | static int da9210_get_current_limit(struct regulator_dev *rdev) | |
107 | { | |
108 | struct da9210 *chip = rdev_get_drvdata(rdev); | |
109 | unsigned int data; | |
110 | unsigned int sel; | |
111 | int ret; | |
112 | ||
113 | ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data); | |
114 | if (ret < 0) | |
115 | return ret; | |
116 | ||
117 | /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */ | |
118 | sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT; | |
119 | ||
120 | return da9210_buck_limits[sel]; | |
121 | } | |
122 | ||
123 | /* | |
124 | * I2C driver interface functions | |
125 | */ | |
126 | static int da9210_i2c_probe(struct i2c_client *i2c, | |
127 | const struct i2c_device_id *id) | |
128 | { | |
129 | struct da9210 *chip; | |
937433c2 GL |
130 | struct device *dev = &i2c->dev; |
131 | struct da9210_pdata *pdata = dev_get_platdata(dev); | |
16f10918 ST |
132 | struct regulator_dev *rdev = NULL; |
133 | struct regulator_config config = { }; | |
134 | int error; | |
135 | ||
136 | chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL); | |
6c48acfb | 137 | if (!chip) |
16f10918 | 138 | return -ENOMEM; |
16f10918 ST |
139 | |
140 | chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); | |
141 | if (IS_ERR(chip->regmap)) { | |
142 | error = PTR_ERR(chip->regmap); | |
143 | dev_err(&i2c->dev, "Failed to allocate register map: %d\n", | |
144 | error); | |
145 | return error; | |
146 | } | |
147 | ||
148 | config.dev = &i2c->dev; | |
937433c2 GL |
149 | config.init_data = pdata ? &pdata->da9210_constraints : |
150 | of_get_regulator_init_data(dev, dev->of_node); | |
16f10918 ST |
151 | config.driver_data = chip; |
152 | config.regmap = chip->regmap; | |
937433c2 | 153 | config.of_node = dev->of_node; |
16f10918 | 154 | |
11c0da7b | 155 | rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config); |
16f10918 ST |
156 | if (IS_ERR(rdev)) { |
157 | dev_err(&i2c->dev, "Failed to register DA9210 regulator\n"); | |
158 | return PTR_ERR(rdev); | |
159 | } | |
160 | ||
161 | chip->rdev = rdev; | |
162 | ||
163 | i2c_set_clientdata(i2c, chip); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
16f10918 ST |
168 | static const struct i2c_device_id da9210_i2c_id[] = { |
169 | {"da9210", 0}, | |
170 | {}, | |
171 | }; | |
172 | ||
173 | MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); | |
174 | ||
175 | static struct i2c_driver da9210_regulator_driver = { | |
176 | .driver = { | |
177 | .name = "da9210", | |
178 | .owner = THIS_MODULE, | |
179 | }, | |
180 | .probe = da9210_i2c_probe, | |
16f10918 ST |
181 | .id_table = da9210_i2c_id, |
182 | }; | |
183 | ||
184 | module_i2c_driver(da9210_regulator_driver); | |
185 | ||
186 | MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); | |
187 | MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210"); | |
188 | MODULE_LICENSE("GPL v2"); |