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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> | |
20 | #include <linux/platform_device.h> | |
21 | #include <linux/power_supply.h> | |
22 | #include <linux/regmap.h> | |
23 | #include <linux/slab.h> | |
24 | ||
25 | #define DRVNAME "axp20x-usb-power-supply" | |
26 | ||
27 | #define AXP20X_PWR_STATUS_VBUS_PRESENT BIT(5) | |
28 | #define AXP20X_PWR_STATUS_VBUS_USED BIT(4) | |
29 | ||
30 | #define AXP20X_USB_STATUS_VBUS_VALID BIT(2) | |
31 | ||
32 | #define AXP20X_VBUS_VHOLD_uV(b) (4000000 + (((b) >> 3) & 7) * 100000) | |
33 | #define AXP20X_VBUS_CLIMIT_MASK 3 | |
34 | #define AXP20X_VBUC_CLIMIT_900mA 0 | |
35 | #define AXP20X_VBUC_CLIMIT_500mA 1 | |
36 | #define AXP20X_VBUC_CLIMIT_100mA 2 | |
37 | #define AXP20X_VBUC_CLIMIT_NONE 3 | |
38 | ||
39 | #define AXP20X_ADC_EN1_VBUS_CURR BIT(2) | |
40 | #define AXP20X_ADC_EN1_VBUS_VOLT BIT(3) | |
41 | ||
42 | #define AXP20X_VBUS_MON_VBUS_VALID BIT(3) | |
43 | ||
44 | struct axp20x_usb_power { | |
45 | struct regmap *regmap; | |
46 | struct power_supply *supply; | |
47 | }; | |
48 | ||
49 | static irqreturn_t axp20x_usb_power_irq(int irq, void *devid) | |
50 | { | |
51 | struct axp20x_usb_power *power = devid; | |
52 | ||
53 | power_supply_changed(power->supply); | |
54 | ||
55 | return IRQ_HANDLED; | |
56 | } | |
57 | ||
58 | static int axp20x_usb_power_get_property(struct power_supply *psy, | |
59 | enum power_supply_property psp, union power_supply_propval *val) | |
60 | { | |
61 | struct axp20x_usb_power *power = power_supply_get_drvdata(psy); | |
62 | unsigned int input, v; | |
63 | int ret; | |
64 | ||
65 | switch (psp) { | |
66 | case POWER_SUPPLY_PROP_VOLTAGE_MIN: | |
67 | ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v); | |
68 | if (ret) | |
69 | return ret; | |
70 | ||
71 | val->intval = AXP20X_VBUS_VHOLD_uV(v); | |
72 | return 0; | |
73 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
74 | ret = axp20x_read_variable_width(power->regmap, | |
75 | AXP20X_VBUS_V_ADC_H, 12); | |
76 | if (ret < 0) | |
77 | return ret; | |
78 | ||
79 | val->intval = ret * 1700; /* 1 step = 1.7 mV */ | |
80 | return 0; | |
81 | case POWER_SUPPLY_PROP_CURRENT_MAX: | |
82 | ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v); | |
83 | if (ret) | |
84 | return ret; | |
85 | ||
86 | switch (v & AXP20X_VBUS_CLIMIT_MASK) { | |
87 | case AXP20X_VBUC_CLIMIT_100mA: | |
88 | val->intval = 100000; | |
89 | break; | |
90 | case AXP20X_VBUC_CLIMIT_500mA: | |
91 | val->intval = 500000; | |
92 | break; | |
93 | case AXP20X_VBUC_CLIMIT_900mA: | |
94 | val->intval = 900000; | |
95 | break; | |
96 | case AXP20X_VBUC_CLIMIT_NONE: | |
97 | val->intval = -1; | |
98 | break; | |
99 | } | |
100 | return 0; | |
101 | case POWER_SUPPLY_PROP_CURRENT_NOW: | |
102 | ret = axp20x_read_variable_width(power->regmap, | |
103 | AXP20X_VBUS_I_ADC_H, 12); | |
104 | if (ret < 0) | |
105 | return ret; | |
106 | ||
107 | val->intval = ret * 375; /* 1 step = 0.375 mA */ | |
108 | return 0; | |
109 | default: | |
110 | break; | |
111 | } | |
112 | ||
113 | /* All the properties below need the input-status reg value */ | |
114 | ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input); | |
115 | if (ret) | |
116 | return ret; | |
117 | ||
118 | switch (psp) { | |
119 | case POWER_SUPPLY_PROP_HEALTH: | |
120 | if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) { | |
121 | val->intval = POWER_SUPPLY_HEALTH_UNKNOWN; | |
122 | break; | |
123 | } | |
124 | ||
125 | ret = regmap_read(power->regmap, AXP20X_USB_OTG_STATUS, &v); | |
126 | if (ret) | |
127 | return ret; | |
128 | ||
129 | if (!(v & AXP20X_USB_STATUS_VBUS_VALID)) { | |
130 | val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; | |
131 | break; | |
132 | } | |
133 | ||
134 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
135 | break; | |
136 | case POWER_SUPPLY_PROP_PRESENT: | |
137 | val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT); | |
138 | break; | |
139 | case POWER_SUPPLY_PROP_ONLINE: | |
140 | val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED); | |
141 | break; | |
142 | default: | |
143 | return -EINVAL; | |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static enum power_supply_property axp20x_usb_power_properties[] = { | |
150 | POWER_SUPPLY_PROP_HEALTH, | |
151 | POWER_SUPPLY_PROP_PRESENT, | |
152 | POWER_SUPPLY_PROP_ONLINE, | |
153 | POWER_SUPPLY_PROP_VOLTAGE_MIN, | |
154 | POWER_SUPPLY_PROP_VOLTAGE_NOW, | |
155 | POWER_SUPPLY_PROP_CURRENT_MAX, | |
156 | POWER_SUPPLY_PROP_CURRENT_NOW, | |
157 | }; | |
158 | ||
159 | static const struct power_supply_desc axp20x_usb_power_desc = { | |
160 | .name = "axp20x-usb", | |
161 | .type = POWER_SUPPLY_TYPE_USB, | |
162 | .properties = axp20x_usb_power_properties, | |
163 | .num_properties = ARRAY_SIZE(axp20x_usb_power_properties), | |
164 | .get_property = axp20x_usb_power_get_property, | |
165 | }; | |
166 | ||
167 | static int axp20x_usb_power_probe(struct platform_device *pdev) | |
168 | { | |
169 | struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); | |
170 | struct power_supply_config psy_cfg = {}; | |
171 | struct axp20x_usb_power *power; | |
172 | static const char * const irq_names[] = { "VBUS_PLUGIN", | |
173 | "VBUS_REMOVAL", "VBUS_VALID", "VBUS_NOT_VALID" }; | |
174 | int i, irq, ret; | |
175 | ||
176 | if (!of_device_is_available(pdev->dev.of_node)) | |
177 | return -ENODEV; | |
178 | ||
179 | if (!axp20x) { | |
180 | dev_err(&pdev->dev, "Parent drvdata not set\n"); | |
181 | return -EINVAL; | |
182 | } | |
183 | ||
184 | power = devm_kzalloc(&pdev->dev, sizeof(*power), GFP_KERNEL); | |
185 | if (!power) | |
186 | return -ENOMEM; | |
187 | ||
188 | power->regmap = axp20x->regmap; | |
189 | ||
190 | /* Enable vbus valid checking */ | |
191 | ret = regmap_update_bits(power->regmap, AXP20X_VBUS_MON, | |
192 | AXP20X_VBUS_MON_VBUS_VALID, AXP20X_VBUS_MON_VBUS_VALID); | |
193 | if (ret) | |
194 | return ret; | |
195 | ||
196 | /* Enable vbus voltage and current measurement */ | |
197 | ret = regmap_update_bits(power->regmap, AXP20X_ADC_EN1, | |
198 | AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT, | |
199 | AXP20X_ADC_EN1_VBUS_CURR | AXP20X_ADC_EN1_VBUS_VOLT); | |
200 | if (ret) | |
201 | return ret; | |
202 | ||
203 | psy_cfg.of_node = pdev->dev.of_node; | |
204 | psy_cfg.drv_data = power; | |
205 | ||
206 | power->supply = devm_power_supply_register(&pdev->dev, | |
207 | &axp20x_usb_power_desc, &psy_cfg); | |
208 | if (IS_ERR(power->supply)) | |
209 | return PTR_ERR(power->supply); | |
210 | ||
211 | /* Request irqs after registering, as irqs may trigger immediately */ | |
212 | for (i = 0; i < ARRAY_SIZE(irq_names); i++) { | |
213 | irq = platform_get_irq_byname(pdev, irq_names[i]); | |
214 | if (irq < 0) { | |
215 | dev_warn(&pdev->dev, "No IRQ for %s: %d\n", | |
216 | irq_names[i], irq); | |
217 | continue; | |
218 | } | |
219 | irq = regmap_irq_get_virq(axp20x->regmap_irqc, irq); | |
220 | ret = devm_request_any_context_irq(&pdev->dev, irq, | |
221 | axp20x_usb_power_irq, 0, DRVNAME, power); | |
222 | if (ret < 0) | |
223 | dev_warn(&pdev->dev, "Error requesting %s IRQ: %d\n", | |
224 | irq_names[i], ret); | |
225 | } | |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
230 | static const struct of_device_id axp20x_usb_power_match[] = { | |
231 | { .compatible = "x-powers,axp202-usb-power-supply" }, | |
232 | { } | |
233 | }; | |
234 | MODULE_DEVICE_TABLE(of, axp20x_usb_power_match); | |
235 | ||
236 | static struct platform_driver axp20x_usb_power_driver = { | |
237 | .probe = axp20x_usb_power_probe, | |
238 | .driver = { | |
239 | .name = DRVNAME, | |
240 | .of_match_table = axp20x_usb_power_match, | |
241 | }, | |
242 | }; | |
243 | ||
244 | module_platform_driver(axp20x_usb_power_driver); | |
245 | ||
246 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
247 | MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver"); | |
248 | MODULE_LICENSE("GPL"); |