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>
26 #define DRVNAME "axp20x-usb-power-supply"
28 #define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5)
29 #define AXP20X_PWR_STATUS_VBUS_USED BIT(4)
31 #define AXP20X_USB_STATUS_VBUS_VALID BIT(2)
33 #define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000)
34 #define AXP20X_VBUS_CLIMIT_MASK 3
35 #define AXP20X_VBUC_CLIMIT_900mA 0
36 #define AXP20X_VBUC_CLIMIT_500mA 1
37 #define AXP20X_VBUC_CLIMIT_100mA 2
38 #define AXP20X_VBUC_CLIMIT_NONE 3
40 #define AXP20X_ADC_EN1_VBUS_CURR BIT(2)
41 #define AXP20X_ADC_EN1_VBUS_VOLT BIT(3)
43 #define AXP20X_VBUS_MON_VBUS_VALID BIT(3)
45 struct axp20x_usb_power {
46 struct device_node *np;
47 struct regmap *regmap;
48 struct power_supply *supply;
52 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
54 struct axp20x_usb_power *power = devid;
56 power_supply_changed(power->supply);
61 static int axp20x_usb_power_get_property(struct power_supply *psy,
62 enum power_supply_property psp, union power_supply_propval *val)
64 struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
65 unsigned int input, v;
69 case POWER_SUPPLY_PROP_VOLTAGE_MIN:
70 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
74 val->intval = AXP20X_VBUS_VHOLD_uV(v);
76 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
77 ret = axp20x_read_variable_width(power->regmap,
78 AXP20X_VBUS_V_ADC_H, 12);
82 val->intval = ret * 1700; /* 1 step = 1.7 mV */
84 case POWER_SUPPLY_PROP_CURRENT_MAX:
85 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
89 switch (v & AXP20X_VBUS_CLIMIT_MASK) {
90 case AXP20X_VBUC_CLIMIT_100mA:
91 if (power->axp20x_id == AXP202_ID) {
94 val->intval = -1; /* No 100mA limit */
97 case AXP20X_VBUC_CLIMIT_500mA:
100 case AXP20X_VBUC_CLIMIT_900mA:
101 val->intval = 900000;
103 case AXP20X_VBUC_CLIMIT_NONE:
108 case POWER_SUPPLY_PROP_CURRENT_NOW:
109 ret = axp20x_read_variable_width(power->regmap,
110 AXP20X_VBUS_I_ADC_H, 12);
114 val->intval = ret * 375; /* 1 step = 0.375 mA */
120 /* All the properties below need the input-status reg value */
121 ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
126 case POWER_SUPPLY_PROP_HEALTH:
127 if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
128 val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
132 val->intval = POWER_SUPPLY_HEALTH_GOOD;
134 if (power->axp20x_id == AXP202_ID) {
135 ret = regmap_read(power->regmap,
136 AXP20X_USB_OTG_STATUS, &v);
140 if (!(v & AXP20X_USB_STATUS_VBUS_VALID))
142 POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
145 case POWER_SUPPLY_PROP_PRESENT:
146 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
148 case POWER_SUPPLY_PROP_ONLINE:
149 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
158 static enum power_supply_property axp20x_usb_power_properties[] = {
159 POWER_SUPPLY_PROP_HEALTH,
160 POWER_SUPPLY_PROP_PRESENT,
161 POWER_SUPPLY_PROP_ONLINE,
162 POWER_SUPPLY_PROP_VOLTAGE_MIN,
163 POWER_SUPPLY_PROP_VOLTAGE_NOW,
164 POWER_SUPPLY_PROP_CURRENT_MAX,
165 POWER_SUPPLY_PROP_CURRENT_NOW,
168 static enum power_supply_property axp22x_usb_power_properties[] = {
169 POWER_SUPPLY_PROP_HEALTH,
170 POWER_SUPPLY_PROP_PRESENT,
171 POWER_SUPPLY_PROP_ONLINE,
172 POWER_SUPPLY_PROP_VOLTAGE_MIN,
173 POWER_SUPPLY_PROP_CURRENT_MAX,
176 static const struct power_supply_desc axp20x_usb_power_desc = {
177 .name = "axp20x-usb",
178 .type = POWER_SUPPLY_TYPE_USB,
179 .properties = axp20x_usb_power_properties,
180 .num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
181 .get_property = axp20x_usb_power_get_property,
184 static const struct power_supply_desc axp22x_usb_power_desc = {
185 .name = "axp20x-usb",
186 .type = POWER_SUPPLY_TYPE_USB,
187 .properties = axp22x_usb_power_properties,
188 .num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
189 .get_property = axp20x_usb_power_get_property,
192 static int axp20x_usb_power_probe(struct platform_device *pdev)
194 struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
195 struct power_supply_config psy_cfg = {};
196 struct axp20x_usb_power *power;
197 static const char * const axp20x_irq_names[] = { "VBUS_PLUGIN",
198 "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID", NULL };
199 static const char * const axp22x_irq_names[] = {
200 "VBUS_PLUGIN", "VBUS_REMOVAL", NULL };
201 static const char * const *irq_names;
202 const struct power_supply_desc *usb_power_desc;
205 if (!of_device_is_available(pdev->dev.of_node))
209 dev_err(&pdev->dev, "Parent drvdata not set\n");
213 power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL);
217 power->axp20x_id = (int)of_device_get_match_data(&pdev->dev);
219 power->np = pdev->dev.of_node;
220 power->regmap = axp20x->regmap;
222 if (power->axp20x_id == AXP202_ID) {
223 /* Enable vbus valid checking */
224 ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON,
225 AXP20X_VBUS_MON_VBUS_VALID,
226 AXP20X_VBUS_MON_VBUS_VALID);
230 /* Enable vbus voltage and current measurement */
231 ret = regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
232 AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT,
233 AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT);
237 usb_power_desc = &axp20x_usb_power_desc;
238 irq_names = axp20x_irq_names;
239 } else if (power->axp20x_id == AXP221_ID) {
240 usb_power_desc = &axp22x_usb_power_desc;
241 irq_names = axp22x_irq_names;
243 dev_err(&pdev->dev, "Unsupported AXP variant: %ld\n",
248 psy_cfg.of_node = pdev->dev.of_node;
249 psy_cfg.drv_data = power;
251 power->supply = devm_power_supply_register(&pdev->dev, usb_power_desc,
253 if (IS_ERR(power->supply))
254 return PTR_ERR(power->supply);
256 /* Request irqs after registering, as irqs may trigger immediately */
257 for (i = 0; irq_names[i]; i++) {
258 irq = platform_get_irq_byname(pdev, irq_names[i]);
260 dev_warn(&pdev->dev, "No IRQ for %s: %d\n",
264 irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
265 ret = devm_request_any_context_irq(&pdev->dev, irq,
266 axp20x_usb_power_irq, 0, DRVNAME, power);
268 dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n",
275 static const struct of_device_id axp20x_usb_power_match[] = {
277 .compatible = "x-powers,axp202-usb-power-supply",
278 .data = (void *)AXP202_ID,
280 .compatible = "x-powers,axp221-usb-power-supply",
281 .data = (void *)AXP221_ID,
282 }, { /* sentinel */ }
284 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
286 static struct platform_driver axp20x_usb_power_driver = {
287 .probe = axp20x_usb_power_probe,
290 .of_match_table = axp20x_usb_power_match,
294 module_platform_driver(axp20x_usb_power_driver);
296 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
297 MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
298 MODULE_LICENSE("GPL");