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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> | |
19 | #include <linux/gpio.h> | |
20 | #include <linux/regmap.h> | |
21 | #include <linux/of_gpio.h> | |
22 | #include <linux/bitops.h> | |
23 | ||
24 | #define SBS_CHARGER_REG_SPEC_INFO 0x11 | |
25 | #define SBS_CHARGER_REG_STATUS 0x13 | |
26 | #define SBS_CHARGER_REG_ALARM_WARNING 0x16 | |
27 | ||
28 | #define SBS_CHARGER_STATUS_CHARGE_INHIBITED BIT(1) | |
29 | #define SBS_CHARGER_STATUS_RES_COLD BIT(9) | |
30 | #define SBS_CHARGER_STATUS_RES_HOT BIT(10) | |
31 | #define SBS_CHARGER_STATUS_BATTERY_PRESENT BIT(14) | |
32 | #define SBS_CHARGER_STATUS_AC_PRESENT BIT(15) | |
33 | ||
34 | #define SBS_CHARGER_POLL_TIME 500 | |
35 | ||
36 | struct sbs_info { | |
37 | struct i2c_client *client; | |
38 | struct power_supply *power_supply; | |
39 | struct regmap *regmap; | |
40 | struct delayed_work work; | |
41 | unsigned int last_state; | |
42 | }; | |
43 | ||
44 | static int sbs_get_property(struct power_supply *psy, | |
45 | enum power_supply_property psp, | |
46 | union power_supply_propval *val) | |
47 | { | |
48 | struct sbs_info *chip = power_supply_get_drvdata(psy); | |
49 | unsigned int reg; | |
50 | ||
51 | reg = chip->last_state; | |
52 | ||
53 | switch (psp) { | |
54 | case POWER_SUPPLY_PROP_PRESENT: | |
55 | val->intval = !!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT); | |
56 | break; | |
57 | ||
58 | case POWER_SUPPLY_PROP_ONLINE: | |
59 | val->intval = !!(reg & SBS_CHARGER_STATUS_AC_PRESENT); | |
60 | break; | |
61 | ||
62 | case POWER_SUPPLY_PROP_STATUS: | |
63 | val->intval = POWER_SUPPLY_STATUS_UNKNOWN; | |
64 | ||
65 | if (!(reg & SBS_CHARGER_STATUS_BATTERY_PRESENT)) | |
66 | val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; | |
67 | else if (reg & SBS_CHARGER_STATUS_AC_PRESENT && | |
68 | !(reg & SBS_CHARGER_STATUS_CHARGE_INHIBITED)) | |
69 | val->intval = POWER_SUPPLY_STATUS_CHARGING; | |
70 | else | |
71 | val->intval = POWER_SUPPLY_STATUS_DISCHARGING; | |
72 | ||
73 | break; | |
74 | ||
75 | case POWER_SUPPLY_PROP_HEALTH: | |
76 | if (reg & SBS_CHARGER_STATUS_RES_COLD) | |
77 | val->intval = POWER_SUPPLY_HEALTH_COLD; | |
78 | if (reg & SBS_CHARGER_STATUS_RES_HOT) | |
79 | val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; | |
80 | else | |
81 | val->intval = POWER_SUPPLY_HEALTH_GOOD; | |
82 | ||
83 | break; | |
84 | ||
85 | default: | |
86 | return -EINVAL; | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static int sbs_check_state(struct sbs_info *chip) | |
93 | { | |
94 | unsigned int reg; | |
95 | int ret; | |
96 | ||
97 | ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, ®); | |
98 | if (!ret && reg != chip->last_state) { | |
99 | chip->last_state = reg; | |
100 | power_supply_changed(chip->power_supply); | |
101 | return 1; | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static void sbs_delayed_work(struct work_struct *work) | |
108 | { | |
109 | struct sbs_info *chip = container_of(work, struct sbs_info, work.work); | |
110 | ||
111 | sbs_check_state(chip); | |
112 | ||
113 | schedule_delayed_work(&chip->work, | |
114 | msecs_to_jiffies(SBS_CHARGER_POLL_TIME)); | |
115 | } | |
116 | ||
117 | static irqreturn_t sbs_irq_thread(int irq, void *data) | |
118 | { | |
119 | struct sbs_info *chip = data; | |
120 | int ret; | |
121 | ||
122 | ret = sbs_check_state(chip); | |
123 | ||
124 | return ret ? IRQ_HANDLED : IRQ_NONE; | |
125 | } | |
126 | ||
127 | static enum power_supply_property sbs_properties[] = { | |
128 | POWER_SUPPLY_PROP_STATUS, | |
129 | POWER_SUPPLY_PROP_PRESENT, | |
130 | POWER_SUPPLY_PROP_ONLINE, | |
131 | POWER_SUPPLY_PROP_HEALTH, | |
132 | }; | |
133 | ||
134 | static bool sbs_readable_reg(struct device *dev, unsigned int reg) | |
135 | { | |
dba83476 | 136 | return reg >= SBS_CHARGER_REG_SPEC_INFO; |
feb583e3 NSJ |
137 | } |
138 | ||
139 | static bool sbs_volatile_reg(struct device *dev, unsigned int reg) | |
140 | { | |
141 | switch (reg) { | |
142 | case SBS_CHARGER_REG_STATUS: | |
143 | return true; | |
144 | } | |
145 | ||
146 | return false; | |
147 | } | |
148 | ||
149 | static const struct regmap_config sbs_regmap = { | |
150 | .reg_bits = 8, | |
151 | .val_bits = 16, | |
152 | .max_register = SBS_CHARGER_REG_ALARM_WARNING, | |
153 | .readable_reg = sbs_readable_reg, | |
154 | .volatile_reg = sbs_volatile_reg, | |
155 | .val_format_endian = REGMAP_ENDIAN_LITTLE, /* since based on SMBus */ | |
156 | }; | |
157 | ||
158 | static const struct power_supply_desc sbs_desc = { | |
159 | .name = "sbs-charger", | |
160 | .type = POWER_SUPPLY_TYPE_MAINS, | |
161 | .properties = sbs_properties, | |
162 | .num_properties = ARRAY_SIZE(sbs_properties), | |
163 | .get_property = sbs_get_property, | |
164 | }; | |
165 | ||
166 | static int sbs_probe(struct i2c_client *client, | |
167 | const struct i2c_device_id *id) | |
168 | { | |
169 | struct power_supply_config psy_cfg = {}; | |
170 | struct sbs_info *chip; | |
171 | int ret, val; | |
172 | ||
173 | chip = devm_kzalloc(&client->dev, sizeof(struct sbs_info), GFP_KERNEL); | |
174 | if (!chip) | |
175 | return -ENOMEM; | |
176 | ||
177 | chip->client = client; | |
178 | psy_cfg.of_node = client->dev.of_node; | |
179 | psy_cfg.drv_data = chip; | |
180 | ||
181 | i2c_set_clientdata(client, chip); | |
182 | ||
183 | chip->regmap = devm_regmap_init_i2c(client, &sbs_regmap); | |
184 | if (IS_ERR(chip->regmap)) | |
185 | return PTR_ERR(chip->regmap); | |
186 | ||
187 | /* | |
188 | * Before we register, we need to make sure we can actually talk | |
189 | * to the battery. | |
190 | */ | |
191 | ret = regmap_read(chip->regmap, SBS_CHARGER_REG_STATUS, &val); | |
192 | if (ret) { | |
193 | dev_err(&client->dev, "Failed to get device status\n"); | |
194 | return ret; | |
195 | } | |
196 | chip->last_state = val; | |
197 | ||
198 | chip->power_supply = devm_power_supply_register(&client->dev, &sbs_desc, | |
199 | &psy_cfg); | |
200 | if (IS_ERR(chip->power_supply)) { | |
201 | dev_err(&client->dev, "Failed to register power supply\n"); | |
202 | return PTR_ERR(chip->power_supply); | |
203 | } | |
204 | ||
205 | /* | |
206 | * The sbs-charger spec doesn't impose the use of an interrupt. So in | |
207 | * the case it wasn't provided we use polling in order get the charger's | |
208 | * status. | |
209 | */ | |
210 | if (client->irq) { | |
211 | ret = devm_request_threaded_irq(&client->dev, client->irq, | |
212 | NULL, sbs_irq_thread, | |
213 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
214 | dev_name(&client->dev), chip); | |
215 | if (ret) { | |
216 | dev_err(&client->dev, "Failed to request irq, %d\n", ret); | |
217 | return ret; | |
218 | } | |
219 | } else { | |
220 | INIT_DELAYED_WORK(&chip->work, sbs_delayed_work); | |
221 | schedule_delayed_work(&chip->work, | |
222 | msecs_to_jiffies(SBS_CHARGER_POLL_TIME)); | |
223 | } | |
224 | ||
225 | dev_info(&client->dev, | |
226 | "%s: smart charger device registered\n", client->name); | |
227 | ||
228 | return 0; | |
229 | } | |
230 | ||
231 | static int sbs_remove(struct i2c_client *client) | |
232 | { | |
233 | struct sbs_info *chip = i2c_get_clientdata(client); | |
234 | ||
235 | cancel_delayed_work_sync(&chip->work); | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | #ifdef CONFIG_OF | |
241 | static const struct of_device_id sbs_dt_ids[] = { | |
242 | { .compatible = "sbs,sbs-charger" }, | |
243 | { }, | |
244 | }; | |
245 | MODULE_DEVICE_TABLE(of, sbs_dt_ids); | |
246 | #endif | |
247 | ||
248 | static const struct i2c_device_id sbs_id[] = { | |
249 | { "sbs-charger", 0 }, | |
250 | { } | |
251 | }; | |
252 | MODULE_DEVICE_TABLE(i2c, sbs_id); | |
253 | ||
254 | static struct i2c_driver sbs_driver = { | |
255 | .probe = sbs_probe, | |
256 | .remove = sbs_remove, | |
257 | .id_table = sbs_id, | |
258 | .driver = { | |
259 | .name = "sbs-charger", | |
260 | .of_match_table = of_match_ptr(sbs_dt_ids), | |
261 | }, | |
262 | }; | |
263 | module_i2c_driver(sbs_driver); | |
264 | ||
265 | MODULE_AUTHOR("Nicolas Saenz Julienne <nicolassaenzj@gmail.com>"); | |
266 | MODULE_DESCRIPTION("SBS smart charger driver"); | |
267 | MODULE_LICENSE("GPL v2"); |