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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
feb583e3 NSJ |
2 | /* |
3 | * Copyright (c) 2016, Prodys S.L. | |
4 | * | |
feb583e3 NSJ |
5 | * This adds support for sbs-charger compilant chips as defined here: |
6 | * http://sbs-forum.org/specs/sbc110.pdf | |
7 | * | |
8 | * Implemetation based on sbs-battery.c | |
9 | */ | |
10 | ||
11 | #include <linux/init.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/err.h> | |
15 | #include <linux/power_supply.h> | |
16 | #include <linux/i2c.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/interrupt.h> | |
feb583e3 | 19 | #include <linux/regmap.h> |
feb583e3 | 20 | #include <linux/bitops.h> |
de85193c | 21 | #include <linux/devm-helpers.h> |
feb583e3 NSJ |
22 | |
23 | #define SBS_CHARGER_REG_SPEC_INFO 0x11 | |
24 | #define SBS_CHARGER_REG_STATUS 0x13 | |
25 | #define SBS_CHARGER_REG_ALARM_WARNING 0x16 | |
26 | ||
27 | #define SBS_CHARGER_STATUS_CHARGE_INHIBITED BIT(1) | |
28 | #define SBS_CHARGER_STATUS_RES_COLD BIT(9) | |
29 | #define SBS_CHARGER_STATUS_RES_HOT BIT(10) | |
30 | #define SBS_CHARGER_STATUS_BATTERY_PRESENT BIT(14) | |
31 | #define SBS_CHARGER_STATUS_AC_PRESENT BIT(15) | |
32 | ||
33 | #define SBS_CHARGER_POLL_TIME 500 | |
34 | ||
35 | struct sbs_info { | |
36 | struct i2c_client *client; | |
37 | struct power_supply *power_supply; | |
38 | struct regmap *regmap; | |
39 | struct delayed_work work; | |
40 | unsigned int last_state; | |
41 | }; | |
42 | ||
43 | static int sbs_get_property(struct power_supply *psy, | |
44 | enum power_supply_property psp, | |
45 | union power_supply_propval *val) | |
46 | { | |
47 | struct sbs_info *chip = power_supply_get_drvdata(psy); | |
48 | unsigned int reg; | |
49 | ||
50 | reg = chip->last_state; | |
51 | ||
52 | switch (psp) { | |
53 | case POWER_SUPPLY_PROP_PRESENT: | |
54 | val->intval = !!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT); | |
55 | break; | |
56 | ||
57 | case POWER_SUPPLY_PROP_ONLINE: | |
58 | val->intval = !!(reg & SBS_CHARGER_STATUS_AC_PRESENT); | |
59 | break; | |
60 | ||
61 | case POWER_SUPPLY_PROP_STATUS: | |
62 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
63 | ||
64 | if (!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT)) | |
65 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
66 | else if (reg & SBS_CHARGER_STATUS_AC_PRESENT && | |
67 | !(reg & SBS_CHARGER_STATUS_CHARGE_INHIBITED)) | |
68 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
69 | else | |
70 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
71 | ||
72 | break; | |
73 | ||
74 | case POWER_SUPPLY_PROP_HEALTH: | |
75 | if (reg & SBS_CHARGER_STATUS_RES_COLD) | |
76 | val->intval = POWER_SUPPLY_HEALTH_COLD; | |
77 | if (reg & SBS_CHARGER_STATUS_RES_HOT) | |
78 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
79 | else | |
80 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
81 | ||
82 | break; | |
83 | ||
84 | default: | |
85 | return -EINVAL; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int sbs_check_state(struct sbs_info *chip) | |
92 | { | |
93 | unsigned int reg; | |
94 | int ret; | |
95 | ||
96 | ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, ®); | |
97 | if (!ret && reg != chip->last_state) { | |
98 | chip->last_state = reg; | |
99 | power_supply_changed(chip->power_supply); | |
100 | return 1; | |
101 | } | |
102 | ||
103 | return 0; | |
104 | } | |
105 | ||
106 | static void sbs_delayed_work(struct work_struct *work) | |
107 | { | |
108 | struct sbs_info *chip = container_of(work, struct sbs_info, work.work); | |
109 | ||
110 | sbs_check_state(chip); | |
111 | ||
112 | schedule_delayed_work(&chip->work, | |
113 | msecs_to_jiffies(SBS_CHARGER_POLL_TIME)); | |
114 | } | |
115 | ||
116 | static irqreturn_t sbs_irq_thread(int irq, void *data) | |
117 | { | |
118 | struct sbs_info *chip = data; | |
119 | int ret; | |
120 | ||
121 | ret = sbs_check_state(chip); | |
122 | ||
123 | return ret ? IRQ_HANDLED : IRQ_NONE; | |
124 | } | |
125 | ||
126 | static enum power_supply_property sbs_properties[] = { | |
127 | POWER_SUPPLY_PROP_STATUS, | |
128 | POWER_SUPPLY_PROP_PRESENT, | |
129 | POWER_SUPPLY_PROP_ONLINE, | |
130 | POWER_SUPPLY_PROP_HEALTH, | |
131 | }; | |
132 | ||
133 | static bool sbs_readable_reg(struct device *dev, unsigned int reg) | |
134 | { | |
dba83476 | 135 | return reg >= SBS_CHARGER_REG_SPEC_INFO; |
feb583e3 NSJ |
136 | } |
137 | ||
138 | static bool sbs_volatile_reg(struct device *dev, unsigned int reg) | |
139 | { | |
140 | switch (reg) { | |
141 | case SBS_CHARGER_REG_STATUS: | |
142 | return true; | |
143 | } | |
144 | ||
145 | return false; | |
146 | } | |
147 | ||
148 | static const struct regmap_config sbs_regmap = { | |
149 | .reg_bits = 8, | |
150 | .val_bits = 16, | |
151 | .max_register = SBS_CHARGER_REG_ALARM_WARNING, | |
152 | .readable_reg = sbs_readable_reg, | |
153 | .volatile_reg = sbs_volatile_reg, | |
154 | .val_format_endian = REGMAP_ENDIAN_LITTLE, /* since based on SMBus */ | |
155 | }; | |
156 | ||
157 | static const struct power_supply_desc sbs_desc = { | |
158 | .name = "sbs-charger", | |
159 | .type = POWER_SUPPLY_TYPE_MAINS, | |
160 | .properties = sbs_properties, | |
161 | .num_properties = ARRAY_SIZE(sbs_properties), | |
162 | .get_property = sbs_get_property, | |
163 | }; | |
164 | ||
165 | static int sbs_probe(struct i2c_client *client, | |
166 | const struct i2c_device_id *id) | |
167 | { | |
168 | struct power_supply_config psy_cfg = {}; | |
169 | struct sbs_info *chip; | |
170 | int ret, val; | |
171 | ||
172 | chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL); | |
173 | if (!chip) | |
174 | return -ENOMEM; | |
175 | ||
176 | chip->client = client; | |
177 | psy_cfg.of_node = client->dev.of_node; | |
178 | psy_cfg.drv_data = chip; | |
179 | ||
180 | i2c_set_clientdata(client, chip); | |
181 | ||
182 | chip->regmap = devm_regmap_init_i2c(client, &sbs_regmap); | |
183 | if (IS_ERR(chip->regmap)) | |
184 | return PTR_ERR(chip->regmap); | |
185 | ||
186 | /* | |
187 | * Before we register, we need to make sure we can actually talk | |
188 | * to the battery. | |
189 | */ | |
190 | ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, &val); | |
e319f4e2 SR |
191 | if (ret) |
192 | return dev_err_probe(&client->dev, ret, "Failed to get device status\n"); | |
feb583e3 NSJ |
193 | chip->last_state = val; |
194 | ||
e319f4e2 SR |
195 | chip->power_supply = devm_power_supply_register(&client->dev, &sbs_desc, &psy_cfg); |
196 | if (IS_ERR(chip->power_supply)) | |
197 | return dev_err_probe(&client->dev, PTR_ERR(chip->power_supply), | |
198 | "Failed to register power supply\n"); | |
feb583e3 NSJ |
199 | |
200 | /* | |
201 | * The sbs-charger spec doesn't impose the use of an interrupt. So in | |
202 | * the case it wasn't provided we use polling in order get the charger's | |
203 | * status. | |
204 | */ | |
205 | if (client->irq) { | |
206 | ret = devm_request_threaded_irq(&client->dev, client->irq, | |
207 | NULL, sbs_irq_thread, | |
208 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
209 | dev_name(&client->dev), chip); | |
e319f4e2 SR |
210 | if (ret) |
211 | return dev_err_probe(&client->dev, ret, "Failed to request irq\n"); | |
feb583e3 | 212 | } else { |
de85193c CJ |
213 | ret = devm_delayed_work_autocancel(&client->dev, &chip->work, |
214 | sbs_delayed_work); | |
215 | if (ret) | |
216 | return dev_err_probe(&client->dev, ret, | |
217 | "Failed to init work for polling\n"); | |
218 | ||
feb583e3 NSJ |
219 | schedule_delayed_work(&chip->work, |
220 | msecs_to_jiffies(SBS_CHARGER_POLL_TIME)); | |
221 | } | |
222 | ||
223 | dev_info(&client->dev, | |
224 | "%s: smart charger device registered\n", client->name); | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
feb583e3 NSJ |
229 | #ifdef CONFIG_OF |
230 | static const struct of_device_id sbs_dt_ids[] = { | |
231 | { .compatible = "sbs,sbs-charger" }, | |
232 | { }, | |
233 | }; | |
234 | MODULE_DEVICE_TABLE(of, sbs_dt_ids); | |
235 | #endif | |
236 | ||
237 | static const struct i2c_device_id sbs_id[] = { | |
238 | { "sbs-charger", 0 }, | |
239 | { } | |
240 | }; | |
241 | MODULE_DEVICE_TABLE(i2c, sbs_id); | |
242 | ||
243 | static struct i2c_driver sbs_driver = { | |
244 | .probe = sbs_probe, | |
feb583e3 NSJ |
245 | .id_table = sbs_id, |
246 | .driver = { | |
247 | .name = "sbs-charger", | |
248 | .of_match_table = of_match_ptr(sbs_dt_ids), | |
249 | }, | |
250 | }; | |
251 | module_i2c_driver(sbs_driver); | |
252 | ||
253 | MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>"); | |
254 | MODULE_DESCRIPTION("SBS smart charger driver"); | |
255 | MODULE_LICENSE("GPL v2"); |