Commit | Line | Data |
---|---|---|
e3e8d1c9 MV |
1 | /* |
2 | * Battery measurement code for Zipit Z2 | |
3 | * | |
4 | * Copyright (C) 2009 Peter Edwards <sweetlilmre@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | */ | |
11 | ||
e3e8d1c9 | 12 | #include <linux/module.h> |
e3e8d1c9 | 13 | #include <linux/gpio.h> |
56b925fc | 14 | #include <linux/i2c.h> |
e3e8d1c9 MV |
15 | #include <linux/interrupt.h> |
16 | #include <linux/irq.h> | |
56b925fc MV |
17 | #include <linux/power_supply.h> |
18 | #include <linux/slab.h> | |
e3e8d1c9 MV |
19 | #include <linux/z2_battery.h> |
20 | ||
21 | #define Z2_DEFAULT_NAME "Z2" | |
22 | ||
23 | struct z2_charger { | |
297d716f KK |
24 | struct z2_battery_info *info; |
25 | int bat_status; | |
26 | struct i2c_client *client; | |
27 | struct power_supply *batt_ps; | |
28 | struct power_supply_desc batt_ps_desc; | |
29 | struct mutex work_lock; | |
30 | struct work_struct bat_work; | |
e3e8d1c9 MV |
31 | }; |
32 | ||
33 | static unsigned long z2_read_bat(struct z2_charger *charger) | |
34 | { | |
35 | int data; | |
36 | data = i2c_smbus_read_byte_data(charger->client, | |
37 | charger->info->batt_I2C_reg); | |
38 | if (data < 0) | |
39 | return 0; | |
40 | ||
41 | return data * charger->info->batt_mult / charger->info->batt_div; | |
42 | } | |
43 | ||
44 | static int z2_batt_get_property(struct power_supply *batt_ps, | |
45 | enum power_supply_property psp, | |
46 | union power_supply_propval *val) | |
47 | { | |
297d716f | 48 | struct z2_charger *charger = power_supply_get_drvdata(batt_ps); |
e3e8d1c9 MV |
49 | struct z2_battery_info *info = charger->info; |
50 | ||
51 | switch (psp) { | |
52 | case POWER_SUPPLY_PROP_STATUS: | |
53 | val->intval = charger->bat_status; | |
54 | break; | |
55 | case POWER_SUPPLY_PROP_TECHNOLOGY: | |
56 | val->intval = info->batt_tech; | |
57 | break; | |
58 | case POWER_SUPPLY_PROP_VOLTAGE_NOW: | |
59 | if (info->batt_I2C_reg >= 0) | |
60 | val->intval = z2_read_bat(charger); | |
61 | else | |
62 | return -EINVAL; | |
63 | break; | |
64 | case POWER_SUPPLY_PROP_VOLTAGE_MAX: | |
65 | if (info->max_voltage >= 0) | |
66 | val->intval = info->max_voltage; | |
67 | else | |
68 | return -EINVAL; | |
69 | break; | |
70 | case POWER_SUPPLY_PROP_VOLTAGE_MIN: | |
71 | if (info->min_voltage >= 0) | |
72 | val->intval = info->min_voltage; | |
73 | else | |
74 | return -EINVAL; | |
75 | break; | |
76 | case POWER_SUPPLY_PROP_PRESENT: | |
77 | val->intval = 1; | |
78 | break; | |
79 | default: | |
80 | return -EINVAL; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static void z2_batt_ext_power_changed(struct power_supply *batt_ps) | |
87 | { | |
297d716f KK |
88 | struct z2_charger *charger = power_supply_get_drvdata(batt_ps); |
89 | ||
e3e8d1c9 MV |
90 | schedule_work(&charger->bat_work); |
91 | } | |
92 | ||
93 | static void z2_batt_update(struct z2_charger *charger) | |
94 | { | |
95 | int old_status = charger->bat_status; | |
96 | struct z2_battery_info *info; | |
97 | ||
98 | info = charger->info; | |
99 | ||
100 | mutex_lock(&charger->work_lock); | |
101 | ||
102 | charger->bat_status = (info->charge_gpio >= 0) ? | |
103 | (gpio_get_value(info->charge_gpio) ? | |
104 | POWER_SUPPLY_STATUS_CHARGING : | |
105 | POWER_SUPPLY_STATUS_DISCHARGING) : | |
106 | POWER_SUPPLY_STATUS_UNKNOWN; | |
107 | ||
108 | if (old_status != charger->bat_status) { | |
297d716f KK |
109 | pr_debug("%s: %i -> %i\n", charger->batt_ps->desc->name, |
110 | old_status, | |
111 | charger->bat_status); | |
112 | power_supply_changed(charger->batt_ps); | |
e3e8d1c9 MV |
113 | } |
114 | ||
115 | mutex_unlock(&charger->work_lock); | |
116 | } | |
117 | ||
118 | static void z2_batt_work(struct work_struct *work) | |
119 | { | |
120 | struct z2_charger *charger; | |
121 | charger = container_of(work, struct z2_charger, bat_work); | |
122 | z2_batt_update(charger); | |
123 | } | |
124 | ||
125 | static irqreturn_t z2_charge_switch_irq(int irq, void *devid) | |
126 | { | |
127 | struct z2_charger *charger = devid; | |
128 | schedule_work(&charger->bat_work); | |
129 | return IRQ_HANDLED; | |
130 | } | |
131 | ||
132 | static int z2_batt_ps_init(struct z2_charger *charger, int props) | |
133 | { | |
134 | int i = 0; | |
135 | enum power_supply_property *prop; | |
136 | struct z2_battery_info *info = charger->info; | |
137 | ||
a223246f VK |
138 | if (info->charge_gpio >= 0) |
139 | props++; /* POWER_SUPPLY_PROP_STATUS */ | |
e3e8d1c9 MV |
140 | if (info->batt_tech >= 0) |
141 | props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */ | |
142 | if (info->batt_I2C_reg >= 0) | |
143 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */ | |
144 | if (info->max_voltage >= 0) | |
145 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */ | |
146 | if (info->min_voltage >= 0) | |
147 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */ | |
148 | ||
149 | prop = kzalloc(props * sizeof(*prop), GFP_KERNEL); | |
150 | if (!prop) | |
151 | return -ENOMEM; | |
152 | ||
153 | prop[i++] = POWER_SUPPLY_PROP_PRESENT; | |
154 | if (info->charge_gpio >= 0) | |
155 | prop[i++] = POWER_SUPPLY_PROP_STATUS; | |
156 | if (info->batt_tech >= 0) | |
157 | prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY; | |
158 | if (info->batt_I2C_reg >= 0) | |
159 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW; | |
160 | if (info->max_voltage >= 0) | |
161 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX; | |
162 | if (info->min_voltage >= 0) | |
163 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN; | |
164 | ||
165 | if (!info->batt_name) { | |
166 | dev_info(&charger->client->dev, | |
167 | "Please consider setting proper battery " | |
168 | "name in platform definition file, falling " | |
169 | "back to name \" Z2_DEFAULT_NAME \"\n"); | |
297d716f | 170 | charger->batt_ps_desc.name = Z2_DEFAULT_NAME; |
e3e8d1c9 | 171 | } else |
297d716f | 172 | charger->batt_ps_desc.name = info->batt_name; |
e3e8d1c9 | 173 | |
297d716f KK |
174 | charger->batt_ps_desc.properties = prop; |
175 | charger->batt_ps_desc.num_properties = props; | |
176 | charger->batt_ps_desc.type = POWER_SUPPLY_TYPE_BATTERY; | |
177 | charger->batt_ps_desc.get_property = z2_batt_get_property; | |
178 | charger->batt_ps_desc.external_power_changed = | |
179 | z2_batt_ext_power_changed; | |
180 | charger->batt_ps_desc.use_for_apm = 1; | |
e3e8d1c9 MV |
181 | |
182 | return 0; | |
183 | } | |
184 | ||
c8afa640 | 185 | static int z2_batt_probe(struct i2c_client *client, |
e3e8d1c9 MV |
186 | const struct i2c_device_id *id) |
187 | { | |
188 | int ret = 0; | |
189 | int props = 1; /* POWER_SUPPLY_PROP_PRESENT */ | |
190 | struct z2_charger *charger; | |
191 | struct z2_battery_info *info = client->dev.platform_data; | |
297d716f | 192 | struct power_supply_config psy_cfg = {}; |
e3e8d1c9 MV |
193 | |
194 | if (info == NULL) { | |
195 | dev_err(&client->dev, | |
196 | "Please set platform device platform_data" | |
197 | " to a valid z2_battery_info pointer!\n"); | |
198 | return -EINVAL; | |
199 | } | |
200 | ||
201 | charger = kzalloc(sizeof(*charger), GFP_KERNEL); | |
202 | if (charger == NULL) | |
203 | return -ENOMEM; | |
204 | ||
205 | charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN; | |
206 | charger->info = info; | |
207 | charger->client = client; | |
208 | i2c_set_clientdata(client, charger); | |
297d716f | 209 | psy_cfg.drv_data = charger; |
e3e8d1c9 MV |
210 | |
211 | mutex_init(&charger->work_lock); | |
212 | ||
213 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) { | |
214 | ret = gpio_request(info->charge_gpio, "BATT CHRG"); | |
215 | if (ret) | |
216 | goto err; | |
217 | ||
218 | ret = gpio_direction_input(info->charge_gpio); | |
219 | if (ret) | |
220 | goto err2; | |
221 | ||
dced35ae TG |
222 | irq_set_irq_type(gpio_to_irq(info->charge_gpio), |
223 | IRQ_TYPE_EDGE_BOTH); | |
e3e8d1c9 | 224 | ret = request_irq(gpio_to_irq(info->charge_gpio), |
3b176b25 | 225 | z2_charge_switch_irq, 0, |
e3e8d1c9 MV |
226 | "AC Detect", charger); |
227 | if (ret) | |
228 | goto err3; | |
229 | } | |
230 | ||
231 | ret = z2_batt_ps_init(charger, props); | |
232 | if (ret) | |
233 | goto err3; | |
234 | ||
235 | INIT_WORK(&charger->bat_work, z2_batt_work); | |
236 | ||
297d716f KK |
237 | charger->batt_ps = power_supply_register(&client->dev, |
238 | &charger->batt_ps_desc, | |
239 | &psy_cfg); | |
240 | if (IS_ERR(charger->batt_ps)) { | |
241 | ret = PTR_ERR(charger->batt_ps); | |
e3e8d1c9 | 242 | goto err4; |
297d716f | 243 | } |
e3e8d1c9 MV |
244 | |
245 | schedule_work(&charger->bat_work); | |
246 | ||
247 | return 0; | |
248 | ||
249 | err4: | |
297d716f | 250 | kfree(charger->batt_ps_desc.properties); |
e3e8d1c9 MV |
251 | err3: |
252 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) | |
253 | free_irq(gpio_to_irq(info->charge_gpio), charger); | |
254 | err2: | |
255 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) | |
256 | gpio_free(info->charge_gpio); | |
257 | err: | |
258 | kfree(charger); | |
259 | return ret; | |
260 | } | |
261 | ||
415ec69f | 262 | static int z2_batt_remove(struct i2c_client *client) |
e3e8d1c9 MV |
263 | { |
264 | struct z2_charger *charger = i2c_get_clientdata(client); | |
265 | struct z2_battery_info *info = charger->info; | |
266 | ||
bc51e7ff | 267 | cancel_work_sync(&charger->bat_work); |
297d716f | 268 | power_supply_unregister(charger->batt_ps); |
e3e8d1c9 | 269 | |
297d716f | 270 | kfree(charger->batt_ps_desc.properties); |
e3e8d1c9 MV |
271 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) { |
272 | free_irq(gpio_to_irq(info->charge_gpio), charger); | |
273 | gpio_free(info->charge_gpio); | |
274 | } | |
275 | ||
276 | kfree(charger); | |
277 | ||
278 | return 0; | |
279 | } | |
280 | ||
281 | #ifdef CONFIG_PM | |
906649de | 282 | static int z2_batt_suspend(struct device *dev) |
e3e8d1c9 | 283 | { |
906649de | 284 | struct i2c_client *client = to_i2c_client(dev); |
bc51e7ff TH |
285 | struct z2_charger *charger = i2c_get_clientdata(client); |
286 | ||
43829731 | 287 | flush_work(&charger->bat_work); |
e3e8d1c9 MV |
288 | return 0; |
289 | } | |
290 | ||
906649de | 291 | static int z2_batt_resume(struct device *dev) |
e3e8d1c9 | 292 | { |
906649de | 293 | struct i2c_client *client = to_i2c_client(dev); |
e3e8d1c9 MV |
294 | struct z2_charger *charger = i2c_get_clientdata(client); |
295 | ||
296 | schedule_work(&charger->bat_work); | |
297 | return 0; | |
298 | } | |
906649de MV |
299 | |
300 | static const struct dev_pm_ops z2_battery_pm_ops = { | |
301 | .suspend = z2_batt_suspend, | |
302 | .resume = z2_batt_resume, | |
303 | }; | |
304 | ||
305 | #define Z2_BATTERY_PM_OPS (&z2_battery_pm_ops) | |
306 | ||
e3e8d1c9 | 307 | #else |
906649de | 308 | #define Z2_BATTERY_PM_OPS (NULL) |
e3e8d1c9 MV |
309 | #endif |
310 | ||
311 | static const struct i2c_device_id z2_batt_id[] = { | |
312 | { "aer915", 0 }, | |
313 | { } | |
314 | }; | |
dcbc9169 | 315 | MODULE_DEVICE_TABLE(i2c, z2_batt_id); |
e3e8d1c9 MV |
316 | |
317 | static struct i2c_driver z2_batt_driver = { | |
318 | .driver = { | |
319 | .name = "z2-battery", | |
320 | .owner = THIS_MODULE, | |
906649de | 321 | .pm = Z2_BATTERY_PM_OPS |
e3e8d1c9 MV |
322 | }, |
323 | .probe = z2_batt_probe, | |
28ea73f4 | 324 | .remove = z2_batt_remove, |
e3e8d1c9 MV |
325 | .id_table = z2_batt_id, |
326 | }; | |
5ff92e7a | 327 | module_i2c_driver(z2_batt_driver); |
e3e8d1c9 MV |
328 | |
329 | MODULE_LICENSE("GPL"); | |
330 | MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>"); | |
331 | MODULE_DESCRIPTION("Zipit Z2 battery driver"); |