2 * AXP20x PMIC USB power supply status driver
4 * Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
5 * Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
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.
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>
20 #include <linux/of_device.h>
21 #include <linux/platform_device.h>
22 #include <linux/power_supply.h>
23 #include <linux/regmap.h>
24 #include <linux/slab.h>
25 #include <linux/iio/consumer.h>
27 #define DRVNAME "axp20x-usb-power-supply"
29 #define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5)
30 #define AXP20X_PWR_STATUS_VBUS_USED BIT(4)
32 #define AXP20X_USB_STATUS_VBUS_VALID BIT(2)
34 #define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000)
35 #define AXP20X_VBUS_VHOLD_MASK GENMASK(5, 3)
36 #define AXP20X_VBUS_VHOLD_OFFSET 3
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
43 #define AXP20X_ADC_EN1_VBUS_CURR BIT(2)
44 #define AXP20X_ADC_EN1_VBUS_VOLT BIT(3)
46 #define AXP20X_VBUS_MON_VBUS_VALID BIT(3)
48 struct axp20x_usb_power {
49 struct device_node *np;
50 struct regmap *regmap;
51 struct power_supply *supply;
52 enum axp20x_variants axp20x_id;
53 struct iio_channel *vbus_v;
54 struct iio_channel *vbus_i;
57 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
59 struct axp20x_usb_power *power = devid;
61 power_supply_changed(power->supply);
66 static int axp20x_usb_power_get_property(struct power_supply *psy,
67 enum power_supply_property psp, union power_supply_propval *val)
69 struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
70 unsigned int input, v;
74 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
75 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
79 val->intval = AXP20X_VBUS_VHOLD_uV(v);
81 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
82 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
83 ret = iio_read_channel_processed(power->vbus_v,
89 * IIO framework gives mV but Power Supply framework
96 ret = axp20x_read_variable_width(power->regmap,
97 AXP20X_VBUS_V_ADC_H, 12);
101 val->intval = ret * 1700; /* 1 step = 1.7 mV */
103 case POWER_SUPPLY_PROP_CURRENT_MAX:
104 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
108 switch (v & AXP20X_VBUS_CLIMIT_MASK) {
109 case AXP20X_VBUC_CLIMIT_100mA:
110 if (power->axp20x_id == AXP221_ID)
111 val->intval = -1; /* No 100mA limit */
113 val->intval = 100000;
115 case AXP20X_VBUC_CLIMIT_500mA:
116 val->intval = 500000;
118 case AXP20X_VBUC_CLIMIT_900mA:
119 val->intval = 900000;
121 case AXP20X_VBUC_CLIMIT_NONE:
126 case POWER_SUPPLY_PROP_CURRENT_NOW:
127 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
128 ret = iio_read_channel_processed(power->vbus_i,
134 * IIO framework gives mA but Power Supply framework
141 ret = axp20x_read_variable_width(power->regmap,
142 AXP20X_VBUS_I_ADC_H, 12);
146 val->intval = ret * 375; /* 1 step = 0.375 mA */
152 /* All the properties below need the input-status reg value */
153 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
158 case POWER_SUPPLY_PROP_HEALTH:
159 if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
160 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
164 val->intval = POWER_SUPPLY_HEALTH_GOOD;
166 if (power->axp20x_id == AXP202_ID) {
167 ret = regmap_read(power->regmap,
168 AXP20X_USB_OTG_STATUS, &v);
172 if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
174 POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
177 case POWER_SUPPLY_PROP_PRESENT:
178 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
180 case POWER_SUPPLY_PROP_ONLINE:
181 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
190 static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
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);
216 static int axp20x_usb_power_set_current_max(struct axp20x_usb_power *power,
223 if (power->axp20x_id == AXP221_ID)
227 val = (900000 - intval) / 400000;
228 return regmap_update_bits(power->regmap,
229 AXP20X_VBUS_IPSOUT_MGMT,
230 AXP20X_VBUS_CLIMIT_MASK, val);
238 static int axp20x_usb_power_set_property(struct power_supply *psy,
239 enum power_supply_property psp,
240 const union power_supply_propval *val)
242 struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
245 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
246 return axp20x_usb_power_set_voltage_min(power, val->intval);
248 case POWER_SUPPLY_PROP_CURRENT_MAX:
249 return axp20x_usb_power_set_current_max(power, val->intval);
258 static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
259 enum power_supply_property psp)
261 return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
262 psp == POWER_SUPPLY_PROP_CURRENT_MAX;
265 static enum power_supply_property axp20x_usb_power_properties[] = {
266 POWER_SUPPLY_PROP_HEALTH,
267 POWER_SUPPLY_PROP_PRESENT,
268 POWER_SUPPLY_PROP_ONLINE,
269 POWER_SUPPLY_PROP_VOLTAGE_MIN,
270 POWER_SUPPLY_PROP_VOLTAGE_NOW,
271 POWER_SUPPLY_PROP_CURRENT_MAX,
272 POWER_SUPPLY_PROP_CURRENT_NOW,
275 static enum power_supply_property axp22x_usb_power_properties[] = {
276 POWER_SUPPLY_PROP_HEALTH,
277 POWER_SUPPLY_PROP_PRESENT,
278 POWER_SUPPLY_PROP_ONLINE,
279 POWER_SUPPLY_PROP_VOLTAGE_MIN,
280 POWER_SUPPLY_PROP_CURRENT_MAX,
283 static const struct power_supply_desc axp20x_usb_power_desc = {
284 .name = "axp20x-usb",
285 .type = POWER_SUPPLY_TYPE_USB,
286 .properties = axp20x_usb_power_properties,
287 .num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
288 .property_is_writeable = axp20x_usb_power_prop_writeable,
289 .get_property = axp20x_usb_power_get_property,
290 .set_property = axp20x_usb_power_set_property,
293 static const struct power_supply_desc axp22x_usb_power_desc = {
294 .name = "axp20x-usb",
295 .type = POWER_SUPPLY_TYPE_USB,
296 .properties = axp22x_usb_power_properties,
297 .num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
298 .property_is_writeable = axp20x_usb_power_prop_writeable,
299 .get_property = axp20x_usb_power_get_property,
300 .set_property = axp20x_usb_power_set_property,
303 static int configure_iio_channels(struct platform_device *pdev,
304 struct axp20x_usb_power *power)
306 power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
307 if (IS_ERR(power->vbus_v)) {
308 if (PTR_ERR(power->vbus_v) == -ENODEV)
309 return -EPROBE_DEFER;
310 return PTR_ERR(power->vbus_v);
313 power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
314 if (IS_ERR(power->vbus_i)) {
315 if (PTR_ERR(power->vbus_i) == -ENODEV)
316 return -EPROBE_DEFER;
317 return PTR_ERR(power->vbus_i);
323 static int configure_adc_registers(struct axp20x_usb_power *power)
325 /* Enable vbus voltage and current measurement */
326 return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
327 AXP20X_ADC_EN1_VBUS_CURR |
328 AXP20X_ADC_EN1_VBUS_VOLT,
329 AXP20X_ADC_EN1_VBUS_CURR |
330 AXP20X_ADC_EN1_VBUS_VOLT);
333 static int axp20x_usb_power_probe(struct platform_device *pdev)
335 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
336 struct power_supply_config psy_cfg = {};
337 struct axp20x_usb_power *power;
338 static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
339 "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
340 static const char * const axp22x_irq_names[] = {
341 "VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
342 static const char * const *irq_names;
343 const struct power_supply_desc *usb_power_desc;
346 if (!of_device_is_available(pdev->dev.of_node))
350 dev_err(&pdev->dev, "Parent drvdata not set\n");
354 power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
358 power->axp20x_id = (enum axp20x_variants)of_device_get_match_data(
361 power->np = pdev->dev.of_node;
362 power->regmap = axp20x->regmap;
364 if (power->axp20x_id == AXP202_ID) {
365 /* Enable vbus valid checking */
366 ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
367 AXP20X_VBUS_MON_VBUS_VALID,
368 AXP20X_VBUS_MON_VBUS_VALID);
372 if (IS_ENABLED(CONFIG_AXP20X_ADC))
373 ret = configure_iio_channels(pdev, power);
375 ret = configure_adc_registers(power);
380 usb_power_desc = &axp20x_usb_power_desc;
381 irq_names = axp20x_irq_names;
382 } else if (power->axp20x_id == AXP221_ID ||
383 power->axp20x_id == AXP223_ID) {
384 usb_power_desc = &axp22x_usb_power_desc;
385 irq_names = axp22x_irq_names;
387 dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
392 psy_cfg.of_node = pdev->dev.of_node;
393 psy_cfg.drv_data = power;
395 power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
397 if (IS_ERR(power->supply))
398 return PTR_ERR(power->supply);
400 /* Request irqs after registering, as irqs may trigger immediately */
401 for (i = 0; irq_names[i]; i++) {
402 irq = platform_get_irq_byname(pdev, irq_names[i]);
404 dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
408 irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
409 ret = devm_request_any_context_irq(&pdev->dev, irq,
410 axp20x_usb_power_irq, 0, DRVNAME, power);
412 dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
419 static const struct of_device_id axp20x_usb_power_match[] = {
421 .compatible = "x-powers,axp202-usb-power-supply",
422 .data = (void *)AXP202_ID,
424 .compatible = "x-powers,axp221-usb-power-supply",
425 .data = (void *)AXP221_ID,
427 .compatible = "x-powers,axp223-usb-power-supply",
428 .data = (void *)AXP223_ID,
429 }, { /* sentinel */ }
431 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
433 static struct platform_driver axp20x_usb_power_driver = {
434 .probe = axp20x_usb_power_probe,
437 .of_match_table = axp20x_usb_power_match,
441 module_platform_driver(axp20x_usb_power_driver);
443 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
444 MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
445 MODULE_LICENSE("GPL");