1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // |
3 | // da9210-regulator.c - Regulator device driver for DA9210 |
4 | // Copyright (C) 2013 Dialog Semiconductor Ltd. |
5 | |
6 | #include <linux/err.h> |
7 | #include <linux/i2c.h> |
8 | #include <linux/module.h> |
9 | #include <linux/interrupt.h> |
10 | #include <linux/irq.h> |
11 | #include <linux/regulator/driver.h> |
12 | #include <linux/regulator/machine.h> |
13 | #include <linux/of.h> |
14 | #include <linux/regulator/of_regulator.h> |
15 | #include <linux/regmap.h> |
16 | |
17 | #include "da9210-regulator.h" |
18 | |
19 | struct da9210 { |
20 | struct regulator_dev *rdev; |
21 | struct regmap *regmap; |
22 | }; |
23 | |
24 | static const struct regmap_config da9210_regmap_config = { |
25 | .reg_bits = 8, |
26 | .val_bits = 8, |
27 | }; |
28 | |
29 | static const struct regulator_ops da9210_buck_ops = { |
30 | .enable = regulator_enable_regmap, |
31 | .disable = regulator_disable_regmap, |
32 | .is_enabled = regulator_is_enabled_regmap, |
33 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
34 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
35 | .list_voltage = regulator_list_voltage_linear, |
36 | .set_current_limit = regulator_set_current_limit_regmap, |
37 | .get_current_limit = regulator_get_current_limit_regmap, |
38 | }; |
39 | |
40 | /* Default limits measured in millivolts and milliamps */ |
41 | #define DA9210_MIN_MV 300 |
42 | #define DA9210_MAX_MV 1570 |
43 | #define DA9210_STEP_MV 10 |
44 | |
45 | /* Current limits for buck (uA) indices corresponds with register values */ |
46 | static const unsigned int da9210_buck_limits[] = { |
47 | 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, |
48 | 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000 |
49 | }; |
50 | |
51 | static const struct regulator_desc da9210_reg = { |
52 | .name = "DA9210" , |
53 | .id = 0, |
54 | .ops = &da9210_buck_ops, |
55 | .type = REGULATOR_VOLTAGE, |
56 | .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1, |
57 | .min_uV = (DA9210_MIN_MV * 1000), |
58 | .uV_step = (DA9210_STEP_MV * 1000), |
59 | .vsel_reg = DA9210_REG_VBUCK_A, |
60 | .vsel_mask = DA9210_VBUCK_MASK, |
61 | .enable_reg = DA9210_REG_BUCK_CONT, |
62 | .enable_mask = DA9210_BUCK_EN, |
63 | .owner = THIS_MODULE, |
64 | .curr_table = da9210_buck_limits, |
65 | .n_current_limits = ARRAY_SIZE(da9210_buck_limits), |
66 | .csel_reg = DA9210_REG_BUCK_ILIM, |
67 | .csel_mask = DA9210_BUCK_ILIM_MASK, |
68 | }; |
69 | |
70 | static irqreturn_t da9210_irq_handler(int irq, void *data) |
71 | { |
72 | struct da9210 *chip = data; |
73 | unsigned int val, handled = 0; |
74 | int error, ret = IRQ_NONE; |
75 | |
76 | error = regmap_read(map: chip->regmap, DA9210_REG_EVENT_B, val: &val); |
77 | if (error < 0) |
78 | goto error_i2c; |
79 | |
80 | if (val & DA9210_E_OVCURR) { |
81 | regulator_notifier_call_chain(rdev: chip->rdev, |
82 | REGULATOR_EVENT_OVER_CURRENT, |
83 | NULL); |
84 | handled |= DA9210_E_OVCURR; |
85 | } |
86 | if (val & DA9210_E_NPWRGOOD) { |
87 | regulator_notifier_call_chain(rdev: chip->rdev, |
88 | REGULATOR_EVENT_UNDER_VOLTAGE, |
89 | NULL); |
90 | handled |= DA9210_E_NPWRGOOD; |
91 | } |
92 | if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) { |
93 | regulator_notifier_call_chain(rdev: chip->rdev, |
94 | REGULATOR_EVENT_OVER_TEMP, NULL); |
95 | handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT); |
96 | } |
97 | if (val & DA9210_E_VMAX) { |
98 | regulator_notifier_call_chain(rdev: chip->rdev, |
99 | REGULATOR_EVENT_REGULATION_OUT, |
100 | NULL); |
101 | handled |= DA9210_E_VMAX; |
102 | } |
103 | |
104 | if (handled) { |
105 | /* Clear handled events */ |
106 | error = regmap_write(map: chip->regmap, DA9210_REG_EVENT_B, val: handled); |
107 | if (error < 0) |
108 | goto error_i2c; |
109 | |
110 | ret = IRQ_HANDLED; |
111 | } |
112 | |
113 | return ret; |
114 | |
115 | error_i2c: |
116 | dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n" , error); |
117 | return ret; |
118 | } |
119 | |
120 | /* |
121 | * I2C driver interface functions |
122 | */ |
123 | |
124 | static const struct of_device_id __maybe_unused da9210_dt_ids[] = { |
125 | { .compatible = "dlg,da9210" , }, |
126 | { } |
127 | }; |
128 | MODULE_DEVICE_TABLE(of, da9210_dt_ids); |
129 | |
130 | static int da9210_i2c_probe(struct i2c_client *i2c) |
131 | { |
132 | struct da9210 *chip; |
133 | struct device *dev = &i2c->dev; |
134 | struct da9210_pdata *pdata = dev_get_platdata(dev); |
135 | struct regulator_dev *rdev = NULL; |
136 | struct regulator_config config = { }; |
137 | int error; |
138 | |
139 | chip = devm_kzalloc(dev: &i2c->dev, size: sizeof(struct da9210), GFP_KERNEL); |
140 | if (!chip) |
141 | return -ENOMEM; |
142 | |
143 | chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config); |
144 | if (IS_ERR(ptr: chip->regmap)) { |
145 | error = PTR_ERR(ptr: chip->regmap); |
146 | dev_err(&i2c->dev, "Failed to allocate register map: %d\n" , |
147 | error); |
148 | return error; |
149 | } |
150 | |
151 | config.dev = &i2c->dev; |
152 | config.init_data = pdata ? &pdata->da9210_constraints : |
153 | of_get_regulator_init_data(dev, node: dev->of_node, desc: &da9210_reg); |
154 | config.driver_data = chip; |
155 | config.regmap = chip->regmap; |
156 | config.of_node = dev->of_node; |
157 | |
158 | /* Mask all interrupt sources to deassert interrupt line */ |
159 | error = regmap_write(map: chip->regmap, DA9210_REG_MASK_A, val: ~0); |
160 | if (!error) |
161 | error = regmap_write(map: chip->regmap, DA9210_REG_MASK_B, val: ~0); |
162 | if (error) { |
163 | dev_err(&i2c->dev, "Failed to write to mask reg: %d\n" , error); |
164 | return error; |
165 | } |
166 | |
167 | rdev = devm_regulator_register(dev: &i2c->dev, regulator_desc: &da9210_reg, config: &config); |
168 | if (IS_ERR(ptr: rdev)) { |
169 | dev_err(&i2c->dev, "Failed to register DA9210 regulator\n" ); |
170 | return PTR_ERR(ptr: rdev); |
171 | } |
172 | |
173 | chip->rdev = rdev; |
174 | if (i2c->irq) { |
175 | error = devm_request_threaded_irq(dev: &i2c->dev, irq: i2c->irq, NULL, |
176 | thread_fn: da9210_irq_handler, |
177 | IRQF_TRIGGER_LOW | |
178 | IRQF_ONESHOT | IRQF_SHARED, |
179 | devname: "da9210" , dev_id: chip); |
180 | if (error) { |
181 | dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n" , |
182 | i2c->irq, error); |
183 | return error; |
184 | } |
185 | |
186 | error = regmap_update_bits(map: chip->regmap, DA9210_REG_MASK_B, |
187 | DA9210_M_OVCURR | DA9210_M_NPWRGOOD | |
188 | DA9210_M_TEMP_WARN | |
189 | DA9210_M_TEMP_CRIT | DA9210_M_VMAX, val: 0); |
190 | if (error < 0) { |
191 | dev_err(&i2c->dev, "Failed to update mask reg: %d\n" , |
192 | error); |
193 | return error; |
194 | } |
195 | } else { |
196 | dev_warn(&i2c->dev, "No IRQ configured\n" ); |
197 | } |
198 | |
199 | i2c_set_clientdata(client: i2c, data: chip); |
200 | |
201 | return 0; |
202 | } |
203 | |
204 | static const struct i2c_device_id da9210_i2c_id[] = { |
205 | {"da9210" , 0}, |
206 | {}, |
207 | }; |
208 | |
209 | MODULE_DEVICE_TABLE(i2c, da9210_i2c_id); |
210 | |
211 | static struct i2c_driver da9210_regulator_driver = { |
212 | .driver = { |
213 | .name = "da9210" , |
214 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
215 | .of_match_table = of_match_ptr(da9210_dt_ids), |
216 | }, |
217 | .probe = da9210_i2c_probe, |
218 | .id_table = da9210_i2c_id, |
219 | }; |
220 | |
221 | module_i2c_driver(da9210_regulator_driver); |
222 | |
223 | MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>" ); |
224 | MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210" ); |
225 | MODULE_LICENSE("GPL v2" ); |
226 | |