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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> | |
42457460 GU |
25 | #include <linux/interrupt.h> |
26 | #include <linux/irq.h> | |
16f10918 ST |
27 | #include <linux/slab.h> |
28 | #include <linux/regulator/driver.h> | |
29 | #include <linux/regulator/machine.h> | |
937433c2 | 30 | #include <linux/regulator/of_regulator.h> |
16f10918 ST |
31 | #include <linux/regmap.h> |
32 | ||
33 | #include "da9210-regulator.h" | |
34 | ||
35 | struct da9210 { | |
36 | struct regulator_dev *rdev; | |
37 | struct regmap *regmap; | |
38 | }; | |
39 | ||
40 | static const struct regmap_config da9210_regmap_config = { | |
41 | .reg_bits = 8, | |
42 | .val_bits = 8, | |
43 | }; | |
44 | ||
45 | static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, | |
46 | int max_uA); | |
47 | static int da9210_get_current_limit(struct regulator_dev *rdev); | |
48 | ||
49 | static struct regulator_ops da9210_buck_ops = { | |
50 | .enable = regulator_enable_regmap, | |
51 | .disable = regulator_disable_regmap, | |
52 | .is_enabled = regulator_is_enabled_regmap, | |
53 | .set_voltage_sel = regulator_set_voltage_sel_regmap, | |
54 | .get_voltage_sel = regulator_get_voltage_sel_regmap, | |
55 | .list_voltage = regulator_list_voltage_linear, | |
56 | .set_current_limit = da9210_set_current_limit, | |
57 | .get_current_limit = da9210_get_current_limit, | |
58 | }; | |
59 | ||
60 | /* Default limits measured in millivolts and milliamps */ | |
61 | #define DA9210_MIN_MV 300 | |
62 | #define DA9210_MAX_MV 1570 | |
63 | #define DA9210_STEP_MV 10 | |
64 | ||
65 | /* Current limits for buck (uA) indices corresponds with register values */ | |
66 | static const int da9210_buck_limits[] = { | |
67 | 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, | |
68 | 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 | |
69 | }; | |
70 | ||
71 | static const struct regulator_desc da9210_reg = { | |
72 | .name = "DA9210", | |
73 | .id = 0, | |
74 | .ops = &da9210_buck_ops, | |
75 | .type = REGULATOR_VOLTAGE, | |
76 | .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, | |
77 | .min_uV = (DA9210_MIN_MV * 1000), | |
78 | .uV_step = (DA9210_STEP_MV * 1000), | |
79 | .vsel_reg = DA9210_REG_VBUCK_A, | |
80 | .vsel_mask = DA9210_VBUCK_MASK, | |
81 | .enable_reg = DA9210_REG_BUCK_CONT, | |
82 | .enable_mask = DA9210_BUCK_EN, | |
83 | .owner = THIS_MODULE, | |
84 | }; | |
85 | ||
86 | static int da9210_set_current_limit(struct regulator_dev *rdev, int min_uA, | |
87 | int max_uA) | |
88 | { | |
89 | struct da9210 *chip = rdev_get_drvdata(rdev); | |
90 | unsigned int sel; | |
91 | int i; | |
92 | ||
93 | /* search for closest to maximum */ | |
94 | for (i = ARRAY_SIZE(da9210_buck_limits)-1; i >= 0; i--) { | |
95 | if (min_uA <= da9210_buck_limits[i] && | |
96 | max_uA >= da9210_buck_limits[i]) { | |
97 | sel = i; | |
98 | sel = sel << DA9210_BUCK_ILIM_SHIFT; | |
99 | return regmap_update_bits(chip->regmap, | |
100 | DA9210_REG_BUCK_ILIM, | |
101 | DA9210_BUCK_ILIM_MASK, sel); | |
102 | } | |
103 | } | |
104 | ||
105 | return -EINVAL; | |
106 | } | |
107 | ||
108 | static int da9210_get_current_limit(struct regulator_dev *rdev) | |
109 | { | |
110 | struct da9210 *chip = rdev_get_drvdata(rdev); | |
111 | unsigned int data; | |
112 | unsigned int sel; | |
113 | int ret; | |
114 | ||
115 | ret = regmap_read(chip->regmap, DA9210_REG_BUCK_ILIM, &data); | |
116 | if (ret < 0) | |
117 | return ret; | |
118 | ||
119 | /* select one of 16 values: 0000 (1600mA) to 1111 (4600mA) */ | |
120 | sel = (data & DA9210_BUCK_ILIM_MASK) >> DA9210_BUCK_ILIM_SHIFT; | |
121 | ||
122 | return da9210_buck_limits[sel]; | |
123 | } | |
124 | ||
42457460 GU |
125 | static irqreturn_t da9210_irq_handler(int irq, void *data) |
126 | { | |
127 | struct da9210 *chip = data; | |
128 | unsigned int val, handled = 0; | |
129 | int error, ret = IRQ_NONE; | |
130 | ||
131 | error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val); | |
132 | if (error < 0) | |
133 | goto error_i2c; | |
134 | ||
135 | if (val & DA9210_E_OVCURR) { | |
136 | regulator_notifier_call_chain(chip->rdev, | |
137 | REGULATOR_EVENT_OVER_CURRENT, | |
138 | NULL); | |
139 | handled |= DA9210_E_OVCURR; | |
140 | } | |
141 | if (val & DA9210_E_NPWRGOOD) { | |
142 | regulator_notifier_call_chain(chip->rdev, | |
143 | REGULATOR_EVENT_UNDER_VOLTAGE, | |
144 | NULL); | |
145 | handled |= DA9210_E_NPWRGOOD; | |
146 | } | |
147 | if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) { | |
148 | regulator_notifier_call_chain(chip->rdev, | |
149 | REGULATOR_EVENT_OVER_TEMP, NULL); | |
150 | handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT); | |
151 | } | |
152 | if (val & DA9210_E_VMAX) { | |
153 | regulator_notifier_call_chain(chip->rdev, | |
154 | REGULATOR_EVENT_REGULATION_OUT, | |
155 | NULL); | |
156 | handled |= DA9210_E_VMAX; | |
157 | } | |
158 | if (handled) { | |
159 | /* Clear handled events */ | |
160 | error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled); | |
161 | if (error < 0) | |
162 | goto error_i2c; | |
163 | ||
164 | ret = IRQ_HANDLED; | |
165 | } | |
166 | ||
167 | return ret; | |
168 | ||
169 | error_i2c: | |
170 | dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error); | |
171 | return ret; | |
172 | } | |
173 | ||
16f10918 ST |
174 | /* |
175 | * I2C driver interface functions | |
176 | */ | |
177 | static int da9210_i2c_probe(struct i2c_client *i2c, | |
178 | const struct i2c_device_id *id) | |
179 | { | |
180 | struct da9210 *chip; | |
937433c2 GL |
181 | struct device *dev = &i2c->dev; |
182 | struct da9210_pdata *pdata = dev_get_platdata(dev); | |
16f10918 ST |
183 | struct regulator_dev *rdev = NULL; |
184 | struct regulator_config config = { }; | |
185 | int error; | |
186 | ||
187 | chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL); | |
6c48acfb | 188 | if (!chip) |
16f10918 | 189 | return -ENOMEM; |
16f10918 ST |
190 | |
191 | chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); | |
192 | if (IS_ERR(chip->regmap)) { | |
193 | error = PTR_ERR(chip->regmap); | |
194 | dev_err(&i2c->dev, "Failed to allocate register map: %d\n", | |
195 | error); | |
196 | return error; | |
197 | } | |
198 | ||
199 | config.dev = &i2c->dev; | |
937433c2 | 200 | config.init_data = pdata ? &pdata->da9210_constraints : |
072e78b1 | 201 | of_get_regulator_init_data(dev, dev->of_node, &da9210_reg); |
16f10918 ST |
202 | config.driver_data = chip; |
203 | config.regmap = chip->regmap; | |
937433c2 | 204 | config.of_node = dev->of_node; |
16f10918 | 205 | |
4d9cbff5 GU |
206 | /* Mask all interrupt sources to deassert interrupt line */ |
207 | error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0); | |
208 | if (!error) | |
209 | error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0); | |
210 | if (error) { | |
211 | dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error); | |
212 | return error; | |
213 | } | |
214 | ||
11c0da7b | 215 | rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config); |
16f10918 ST |
216 | if (IS_ERR(rdev)) { |
217 | dev_err(&i2c->dev, "Failed to register DA9210 regulator\n"); | |
218 | return PTR_ERR(rdev); | |
219 | } | |
220 | ||
221 | chip->rdev = rdev; | |
42457460 GU |
222 | if (i2c->irq) { |
223 | error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL, | |
224 | da9210_irq_handler, | |
225 | IRQF_TRIGGER_LOW | | |
226 | IRQF_ONESHOT | IRQF_SHARED, | |
227 | "da9210", chip); | |
228 | if (error) { | |
229 | dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n", | |
230 | i2c->irq, error); | |
231 | return error; | |
232 | } | |
233 | ||
234 | error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B, | |
235 | DA9210_M_OVCURR | DA9210_M_NPWRGOOD | | |
236 | DA9210_M_TEMP_WARN | | |
237 | DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0); | |
238 | if (error < 0) { | |
239 | dev_err(&i2c->dev, "Failed to update mask reg: %d\n", | |
240 | error); | |
241 | return error; | |
242 | } | |
243 | } else { | |
244 | dev_warn(&i2c->dev, "No IRQ configured\n"); | |
245 | } | |
16f10918 ST |
246 | |
247 | i2c_set_clientdata(i2c, chip); | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
16f10918 ST |
252 | static const struct i2c_device_id da9210_i2c_id[] = { |
253 | {"da9210", 0}, | |
254 | {}, | |
255 | }; | |
256 | ||
257 | MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); | |
258 | ||
259 | static struct i2c_driver da9210_regulator_driver = { | |
260 | .driver = { | |
261 | .name = "da9210", | |
16f10918 ST |
262 | }, |
263 | .probe = da9210_i2c_probe, | |
16f10918 ST |
264 | .id_table = da9210_i2c_id, |
265 | }; | |
266 | ||
267 | module_i2c_driver(da9210_regulator_driver); | |
268 | ||
269 | MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>"); | |
270 | MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210"); | |
271 | MODULE_LICENSE("GPL v2"); |