Commit | Line | Data |
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69fb4dca HG |
1 | /* |
2 | * AXP20x PMIC USB power supply status driver | |
3 | * | |
4 | * Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com> | |
5 | * Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/device.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/mfd/axp20x.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/of.h> | |
0dcc70ca | 20 | #include <linux/of_device.h> |
69fb4dca HG |
21 | #include <linux/platform_device.h> |
22 | #include <linux/power_supply.h> | |
23 | #include <linux/regmap.h> | |
24 | #include <linux/slab.h> | |
33863c93 | 25 | #include <linux/iio/consumer.h> |
69fb4dca HG |
26 | |
27 | #define DRVNAME "axp20x-usb-power-supply" | |
28 | ||
29 | #define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5) | |
30 | #define AXP20X_PWR_STATUS_VBUS_USED BIT(4) | |
31 | ||
32 | #define AXP20X_USB_STATUS_VBUS_VALID BIT(2) | |
33 | ||
34 | #define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000) | |
5c3ff59b QS |
35 | #define AXP20X_VBUS_VHOLD_MASK GENMASK(5, 3) |
36 | #define AXP20X_VBUS_VHOLD_OFFSET 3 | |
69fb4dca HG |
37 | #define AXP20X_VBUS_CLIMIT_MASK 3 |
38 | #define AXP20X_VBUC_CLIMIT_900mA 0 | |
39 | #define AXP20X_VBUC_CLIMIT_500mA 1 | |
40 | #define AXP20X_VBUC_CLIMIT_100mA 2 | |
41 | #define AXP20X_VBUC_CLIMIT_NONE 3 | |
42 | ||
43 | #define AXP20X_ADC_EN1_VBUS_CURR BIT(2) | |
44 | #define AXP20X_ADC_EN1_VBUS_VOLT BIT(3) | |
45 | ||
46 | #define AXP20X_VBUS_MON_VBUS_VALID BIT(3) | |
47 | ||
48 | struct axp20x_usb_power { | |
cecbf8d5 | 49 | struct device_node *np; |
69fb4dca HG |
50 | struct regmap *regmap; |
51 | struct power_supply *supply; | |
15df6d98 | 52 | enum axp20x_variants axp20x_id; |
33863c93 QS |
53 | struct iio_channel *vbus_v; |
54 | struct iio_channel *vbus_i; | |
69fb4dca HG |
55 | }; |
56 | ||
57 | static irqreturn_t axp20x_usb_power_irq(int irq, void *devid) | |
58 | { | |
59 | struct axp20x_usb_power *power = devid; | |
60 | ||
61 | power_supply_changed(power->supply); | |
62 | ||
63 | return IRQ_HANDLED; | |
64 | } | |
65 | ||
66 | static int axp20x_usb_power_get_property(struct power_supply *psy, | |
67 | enum power_supply_property psp, union power_supply_propval *val) | |
68 | { | |
69 | struct axp20x_usb_power *power = power_supply_get_drvdata(psy); | |
70 | unsigned int input, v; | |
71 | int ret; | |
72 | ||
73 | switch (psp) { | |
74 | case POWER_SUPPLY_PROP_VOLTAGE_MIN: | |
75 | ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v); | |
76 | if (ret) | |
77 | return ret; | |
78 | ||
79 | val->intval = AXP20X_VBUS_VHOLD_uV(v); | |
80 | return 0; | |
81 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
33863c93 QS |
82 | if (IS_ENABLED(CONFIG_AXP20X_ADC)) { |
83 | ret = iio_read_channel_processed(power->vbus_v, | |
84 | &val->intval); | |
85 | if (ret) | |
86 | return ret; | |
87 | ||
88 | /* | |
89 | * IIO framework gives mV but Power Supply framework | |
90 | * gives uV. | |
91 | */ | |
92 | val->intval *= 1000; | |
93 | return 0; | |
94 | } | |
95 | ||
69fb4dca HG |
96 | ret = axp20x_read_variable_width(power->regmap, |
97 | AXP20X_VBUS_V_ADC_H, 12); | |
98 | if (ret < 0) | |
99 | return ret; | |
100 | ||
101 | val->intval = ret * 1700; /* 1 step = 1.7 mV */ | |
102 | return 0; | |
103 | case POWER_SUPPLY_PROP_CURRENT_MAX: | |
104 | ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v); | |
105 | if (ret) | |
106 | return ret; | |
107 | ||
108 | switch (v & AXP20X_VBUS_CLIMIT_MASK) { | |
109 | case AXP20X_VBUC_CLIMIT_100mA: | |
50111d3f | 110 | if (power->axp20x_id == AXP221_ID) |
cecbf8d5 | 111 | val->intval = -1; /* No 100mA limit */ |
50111d3f QS |
112 | else |
113 | val->intval = 100000; | |
69fb4dca HG |
114 | break; |
115 | case AXP20X_VBUC_CLIMIT_500mA: | |
116 | val->intval = 500000; | |
117 | break; | |
118 | case AXP20X_VBUC_CLIMIT_900mA: | |
119 | val->intval = 900000; | |
120 | break; | |
121 | case AXP20X_VBUC_CLIMIT_NONE: | |
122 | val->intval = -1; | |
123 | break; | |
124 | } | |
125 | return 0; | |
126 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
33863c93 QS |
127 | if (IS_ENABLED(CONFIG_AXP20X_ADC)) { |
128 | ret = iio_read_channel_processed(power->vbus_i, | |
129 | &val->intval); | |
130 | if (ret) | |
131 | return ret; | |
132 | ||
133 | /* | |
134 | * IIO framework gives mA but Power Supply framework | |
135 | * gives uA. | |
136 | */ | |
137 | val->intval *= 1000; | |
138 | return 0; | |
139 | } | |
140 | ||
69fb4dca HG |
141 | ret = axp20x_read_variable_width(power->regmap, |
142 | AXP20X_VBUS_I_ADC_H, 12); | |
143 | if (ret < 0) | |
144 | return ret; | |
145 | ||
146 | val->intval = ret * 375; /* 1 step = 0.375 mA */ | |
147 | return 0; | |
148 | default: | |
149 | break; | |
150 | } | |
151 | ||
152 | /* All the properties below need the input-status reg value */ | |
153 | ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input); | |
154 | if (ret) | |
155 | return ret; | |
156 | ||
157 | switch (psp) { | |
158 | case POWER_SUPPLY_PROP_HEALTH: | |
159 | if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) { | |
160 | val->intval = POWER_SUPPLY_HEALTH_UNKNOWN; | |
161 | break; | |
162 | } | |
163 | ||
cecbf8d5 | 164 | val->intval = POWER_SUPPLY_HEALTH_GOOD; |
69fb4dca | 165 | |
0dcc70ca | 166 | if (power->axp20x_id == AXP202_ID) { |
cecbf8d5 HG |
167 | ret = regmap_read(power->regmap, |
168 | AXP20X_USB_OTG_STATUS, &v); | |
169 | if (ret) | |
170 | return ret; | |
69fb4dca | 171 | |
cecbf8d5 HG |
172 | if (!(v & AXP20X_USB_STATUS_VBUS_VALID)) |
173 | val->intval = | |
174 | POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
175 | } | |
69fb4dca HG |
176 | break; |
177 | case POWER_SUPPLY_PROP_PRESENT: | |
178 | val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT); | |
179 | break; | |
180 | case POWER_SUPPLY_PROP_ONLINE: | |
181 | val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED); | |
182 | break; | |
183 | default: | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
5c3ff59b QS |
190 | static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power, |
191 | int intval) | |
192 | { | |
193 | int val; | |
194 | ||
195 | switch (intval) { | |
196 | case 4000000: | |
197 | case 4100000: | |
198 | case 4200000: | |
199 | case 4300000: | |
200 | case 4400000: | |
201 | case 4500000: | |
202 | case 4600000: | |
203 | case 4700000: | |
204 | val = (intval - 4000000) / 100000; | |
205 | return regmap_update_bits(power->regmap, | |
206 | AXP20X_VBUS_IPSOUT_MGMT, | |
207 | AXP20X_VBUS_VHOLD_MASK, | |
208 | val << AXP20X_VBUS_VHOLD_OFFSET); | |
209 | default: | |
210 | return -EINVAL; | |
211 | } | |
212 | ||
213 | return -EINVAL; | |
214 | } | |
215 | ||
216 | static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power, | |
217 | int intval) | |
218 | { | |
219 | int val; | |
220 | ||
221 | switch (intval) { | |
222 | case 100000: | |
223 | if (power->axp20x_id == AXP221_ID) | |
224 | return -EINVAL; | |
37bab356 | 225 | /* fall through */ |
5c3ff59b QS |
226 | case 500000: |
227 | case 900000: | |
228 | val = (900000 - intval) / 400000; | |
229 | return regmap_update_bits(power->regmap, | |
230 | AXP20X_VBUS_IPSOUT_MGMT, | |
231 | AXP20X_VBUS_CLIMIT_MASK, val); | |
232 | default: | |
233 | return -EINVAL; | |
234 | } | |
235 | ||
236 | return -EINVAL; | |
237 | } | |
238 | ||
239 | static int axp20x_usb_power_set_property(struct power_supply *psy, | |
240 | enum power_supply_property psp, | |
241 | const union power_supply_propval *val) | |
242 | { | |
243 | struct axp20x_usb_power *power = power_supply_get_drvdata(psy); | |
244 | ||
245 | switch (psp) { | |
246 | case POWER_SUPPLY_PROP_VOLTAGE_MIN: | |
247 | return axp20x_usb_power_set_voltage_min(power, val->intval); | |
248 | ||
249 | case POWER_SUPPLY_PROP_CURRENT_MAX: | |
250 | return axp20x_usb_power_set_current_max(power, val->intval); | |
251 | ||
252 | default: | |
253 | return -EINVAL; | |
254 | } | |
255 | ||
256 | return -EINVAL; | |
257 | } | |
258 | ||
259 | static int axp20x_usb_power_prop_writeable(struct power_supply *psy, | |
260 | enum power_supply_property psp) | |
261 | { | |
262 | return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN || | |
263 | psp == POWER_SUPPLY_PROP_CURRENT_MAX; | |
264 | } | |
265 | ||
69fb4dca HG |
266 | static enum power_supply_property axp20x_usb_power_properties[] = { |
267 | POWER_SUPPLY_PROP_HEALTH, | |
268 | POWER_SUPPLY_PROP_PRESENT, | |
269 | POWER_SUPPLY_PROP_ONLINE, | |
270 | POWER_SUPPLY_PROP_VOLTAGE_MIN, | |
271 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
272 | POWER_SUPPLY_PROP_CURRENT_MAX, | |
273 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
274 | }; | |
275 | ||
cecbf8d5 HG |
276 | static enum power_supply_property axp22x_usb_power_properties[] = { |
277 | POWER_SUPPLY_PROP_HEALTH, | |
278 | POWER_SUPPLY_PROP_PRESENT, | |
279 | POWER_SUPPLY_PROP_ONLINE, | |
280 | POWER_SUPPLY_PROP_VOLTAGE_MIN, | |
281 | POWER_SUPPLY_PROP_CURRENT_MAX, | |
282 | }; | |
283 | ||
69fb4dca HG |
284 | static const struct power_supply_desc axp20x_usb_power_desc = { |
285 | .name = "axp20x-usb", | |
286 | .type = POWER_SUPPLY_TYPE_USB, | |
287 | .properties = axp20x_usb_power_properties, | |
288 | .num_properties = ARRAY_SIZE(axp20x_usb_power_properties), | |
5c3ff59b | 289 | .property_is_writeable = axp20x_usb_power_prop_writeable, |
69fb4dca | 290 | .get_property = axp20x_usb_power_get_property, |
5c3ff59b | 291 | .set_property = axp20x_usb_power_set_property, |
69fb4dca HG |
292 | }; |
293 | ||
cecbf8d5 HG |
294 | static const struct power_supply_desc axp22x_usb_power_desc = { |
295 | .name = "axp20x-usb", | |
296 | .type = POWER_SUPPLY_TYPE_USB, | |
297 | .properties = axp22x_usb_power_properties, | |
298 | .num_properties = ARRAY_SIZE(axp22x_usb_power_properties), | |
5c3ff59b | 299 | .property_is_writeable = axp20x_usb_power_prop_writeable, |
cecbf8d5 | 300 | .get_property = axp20x_usb_power_get_property, |
5c3ff59b | 301 | .set_property = axp20x_usb_power_set_property, |
cecbf8d5 HG |
302 | }; |
303 | ||
33863c93 QS |
304 | static int configure_iio_channels(struct platform_device *pdev, |
305 | struct axp20x_usb_power *power) | |
306 | { | |
307 | power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v"); | |
308 | if (IS_ERR(power->vbus_v)) { | |
309 | if (PTR_ERR(power->vbus_v) == -ENODEV) | |
310 | return -EPROBE_DEFER; | |
311 | return PTR_ERR(power->vbus_v); | |
312 | } | |
313 | ||
314 | power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i"); | |
315 | if (IS_ERR(power->vbus_i)) { | |
316 | if (PTR_ERR(power->vbus_i) == -ENODEV) | |
317 | return -EPROBE_DEFER; | |
318 | return PTR_ERR(power->vbus_i); | |
319 | } | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | static int configure_adc_registers(struct axp20x_usb_power *power) | |
325 | { | |
326 | /* Enable vbus voltage and current measurement */ | |
327 | return regmap_update_bits(power->regmap, AXP20X_ADC_EN1, | |
328 | AXP20X_ADC_EN1_VBUS_CURR | | |
329 | AXP20X_ADC_EN1_VBUS_VOLT, | |
330 | AXP20X_ADC_EN1_VBUS_CURR | | |
331 | AXP20X_ADC_EN1_VBUS_VOLT); | |
332 | } | |
333 | ||
69fb4dca HG |
334 | static int axp20x_usb_power_probe(struct platform_device *pdev) |
335 | { | |
336 | struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); | |
337 | struct power_supply_config psy_cfg = {}; | |
338 | struct axp20x_usb_power *power; | |
cecbf8d5 HG |
339 | static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN", |
340 | "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL }; | |
341 | static const char * const axp22x_irq_names[] = { | |
342 | "VBUS_PLUGIN", "VBUS_REMOVAL", NULL }; | |
a4631820 | 343 | const char * const *irq_names; |
cecbf8d5 | 344 | const struct power_supply_desc *usb_power_desc; |
69fb4dca HG |
345 | int i, irq, ret; |
346 | ||
347 | if (!of_device_is_available(pdev->dev.of_node)) | |
348 | return -ENODEV; | |
349 | ||
350 | if (!axp20x) { | |
351 | dev_err(&pdev->dev, "Parent drvdata not set\n"); | |
352 | return -EINVAL; | |
353 | } | |
354 | ||
355 | power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL); | |
356 | if (!power) | |
357 | return -ENOMEM; | |
358 | ||
15df6d98 MS |
359 | power->axp20x_id = (enum axp20x_variants)of_device_get_match_data( |
360 | &pdev->dev); | |
0dcc70ca | 361 | |
cecbf8d5 | 362 | power->np = pdev->dev.of_node; |
69fb4dca HG |
363 | power->regmap = axp20x->regmap; |
364 | ||
0dcc70ca | 365 | if (power->axp20x_id == AXP202_ID) { |
cecbf8d5 HG |
366 | /* Enable vbus valid checking */ |
367 | ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON, | |
368 | AXP20X_VBUS_MON_VBUS_VALID, | |
369 | AXP20X_VBUS_MON_VBUS_VALID); | |
370 | if (ret) | |
371 | return ret; | |
69fb4dca | 372 | |
33863c93 QS |
373 | if (IS_ENABLED(CONFIG_AXP20X_ADC)) |
374 | ret = configure_iio_channels(pdev, power); | |
375 | else | |
376 | ret = configure_adc_registers(power); | |
377 | ||
cecbf8d5 HG |
378 | if (ret) |
379 | return ret; | |
380 | ||
381 | usb_power_desc = &axp20x_usb_power_desc; | |
382 | irq_names = axp20x_irq_names; | |
50111d3f QS |
383 | } else if (power->axp20x_id == AXP221_ID || |
384 | power->axp20x_id == AXP223_ID) { | |
cecbf8d5 HG |
385 | usb_power_desc = &axp22x_usb_power_desc; |
386 | irq_names = axp22x_irq_names; | |
387 | } else { | |
388 | dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n", | |
389 | axp20x->variant); | |
390 | return -EINVAL; | |
391 | } | |
69fb4dca HG |
392 | |
393 | psy_cfg.of_node = pdev->dev.of_node; | |
394 | psy_cfg.drv_data = power; | |
395 | ||
cecbf8d5 HG |
396 | power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc, |
397 | &psy_cfg); | |
69fb4dca HG |
398 | if (IS_ERR(power->supply)) |
399 | return PTR_ERR(power->supply); | |
400 | ||
401 | /* Request irqs after registering, as irqs may trigger immediately */ | |
cecbf8d5 | 402 | for (i = 0; irq_names[i]; i++) { |
69fb4dca HG |
403 | irq = platform_get_irq_byname(pdev, irq_names[i]); |
404 | if (irq < 0) { | |
405 | dev_warn(&pdev->dev, "No IRQ for %s: %d\n", | |
406 | irq_names[i], irq); | |
407 | continue; | |
408 | } | |
409 | irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq); | |
410 | ret = devm_request_any_context_irq(&pdev->dev, irq, | |
411 | axp20x_usb_power_irq, 0, DRVNAME, power); | |
412 | if (ret < 0) | |
413 | dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n", | |
414 | irq_names[i], ret); | |
415 | } | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | static const struct of_device_id axp20x_usb_power_match[] = { | |
0dcc70ca QS |
421 | { |
422 | .compatible = "x-powers,axp202-usb-power-supply", | |
423 | .data = (void *)AXP202_ID, | |
424 | }, { | |
425 | .compatible = "x-powers,axp221-usb-power-supply", | |
426 | .data = (void *)AXP221_ID, | |
50111d3f QS |
427 | }, { |
428 | .compatible = "x-powers,axp223-usb-power-supply", | |
429 | .data = (void *)AXP223_ID, | |
0dcc70ca | 430 | }, { /* sentinel */ } |
69fb4dca HG |
431 | }; |
432 | MODULE_DEVICE_TABLE(of, axp20x_usb_power_match); | |
433 | ||
434 | static struct platform_driver axp20x_usb_power_driver = { | |
435 | .probe = axp20x_usb_power_probe, | |
436 | .driver = { | |
437 | .name = DRVNAME, | |
438 | .of_match_table = axp20x_usb_power_match, | |
439 | }, | |
440 | }; | |
441 | ||
442 | module_platform_driver(axp20x_usb_power_driver); | |
443 | ||
444 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
445 | MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver"); | |
446 | MODULE_LICENSE("GPL"); |