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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 { | |
24 | struct z2_battery_info *info; | |
25 | int bat_status; | |
26 | struct i2c_client *client; | |
27 | struct power_supply batt_ps; | |
28 | struct mutex work_lock; | |
29 | struct work_struct bat_work; | |
30 | }; | |
31 | ||
32 | static unsigned long z2_read_bat(struct z2_charger *charger) | |
33 | { | |
34 | int data; | |
35 | data = i2c_smbus_read_byte_data(charger->client, | |
36 | charger->info->batt_I2C_reg); | |
37 | if (data < 0) | |
38 | return 0; | |
39 | ||
40 | return data * charger->info->batt_mult / charger->info->batt_div; | |
41 | } | |
42 | ||
43 | static int z2_batt_get_property(struct power_supply *batt_ps, | |
44 | enum power_supply_property psp, | |
45 | union power_supply_propval *val) | |
46 | { | |
47 | struct z2_charger *charger = container_of(batt_ps, struct z2_charger, | |
48 | batt_ps); | |
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 | { | |
88 | struct z2_charger *charger = container_of(batt_ps, struct z2_charger, | |
89 | batt_ps); | |
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) { | |
109 | pr_debug("%s: %i -> %i\n", charger->batt_ps.name, old_status, | |
110 | charger->bat_status); | |
111 | power_supply_changed(&charger->batt_ps); | |
112 | } | |
113 | ||
114 | mutex_unlock(&charger->work_lock); | |
115 | } | |
116 | ||
117 | static void z2_batt_work(struct work_struct *work) | |
118 | { | |
119 | struct z2_charger *charger; | |
120 | charger = container_of(work, struct z2_charger, bat_work); | |
121 | z2_batt_update(charger); | |
122 | } | |
123 | ||
124 | static irqreturn_t z2_charge_switch_irq(int irq, void *devid) | |
125 | { | |
126 | struct z2_charger *charger = devid; | |
127 | schedule_work(&charger->bat_work); | |
128 | return IRQ_HANDLED; | |
129 | } | |
130 | ||
131 | static int z2_batt_ps_init(struct z2_charger *charger, int props) | |
132 | { | |
133 | int i = 0; | |
134 | enum power_supply_property *prop; | |
135 | struct z2_battery_info *info = charger->info; | |
136 | ||
137 | if (info->batt_tech >= 0) | |
138 | props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */ | |
139 | if (info->batt_I2C_reg >= 0) | |
140 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */ | |
141 | if (info->max_voltage >= 0) | |
142 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */ | |
143 | if (info->min_voltage >= 0) | |
144 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */ | |
145 | ||
146 | prop = kzalloc(props * sizeof(*prop), GFP_KERNEL); | |
147 | if (!prop) | |
148 | return -ENOMEM; | |
149 | ||
150 | prop[i++] = POWER_SUPPLY_PROP_PRESENT; | |
151 | if (info->charge_gpio >= 0) | |
152 | prop[i++] = POWER_SUPPLY_PROP_STATUS; | |
153 | if (info->batt_tech >= 0) | |
154 | prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY; | |
155 | if (info->batt_I2C_reg >= 0) | |
156 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW; | |
157 | if (info->max_voltage >= 0) | |
158 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX; | |
159 | if (info->min_voltage >= 0) | |
160 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN; | |
161 | ||
162 | if (!info->batt_name) { | |
163 | dev_info(&charger->client->dev, | |
164 | "Please consider setting proper battery " | |
165 | "name in platform definition file, falling " | |
166 | "back to name \" Z2_DEFAULT_NAME \"\n"); | |
167 | charger->batt_ps.name = Z2_DEFAULT_NAME; | |
168 | } else | |
169 | charger->batt_ps.name = info->batt_name; | |
170 | ||
171 | charger->batt_ps.properties = prop; | |
172 | charger->batt_ps.num_properties = props; | |
173 | charger->batt_ps.type = POWER_SUPPLY_TYPE_BATTERY; | |
174 | charger->batt_ps.get_property = z2_batt_get_property; | |
175 | charger->batt_ps.external_power_changed = z2_batt_ext_power_changed; | |
176 | charger->batt_ps.use_for_apm = 1; | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
181 | static int __devinit z2_batt_probe(struct i2c_client *client, | |
182 | const struct i2c_device_id *id) | |
183 | { | |
184 | int ret = 0; | |
185 | int props = 1; /* POWER_SUPPLY_PROP_PRESENT */ | |
186 | struct z2_charger *charger; | |
187 | struct z2_battery_info *info = client->dev.platform_data; | |
188 | ||
189 | if (info == NULL) { | |
190 | dev_err(&client->dev, | |
191 | "Please set platform device platform_data" | |
192 | " to a valid z2_battery_info pointer!\n"); | |
193 | return -EINVAL; | |
194 | } | |
195 | ||
196 | charger = kzalloc(sizeof(*charger), GFP_KERNEL); | |
197 | if (charger == NULL) | |
198 | return -ENOMEM; | |
199 | ||
200 | charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN; | |
201 | charger->info = info; | |
202 | charger->client = client; | |
203 | i2c_set_clientdata(client, charger); | |
204 | ||
205 | mutex_init(&charger->work_lock); | |
206 | ||
207 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) { | |
208 | ret = gpio_request(info->charge_gpio, "BATT CHRG"); | |
209 | if (ret) | |
210 | goto err; | |
211 | ||
212 | ret = gpio_direction_input(info->charge_gpio); | |
213 | if (ret) | |
214 | goto err2; | |
215 | ||
216 | set_irq_type(gpio_to_irq(info->charge_gpio), | |
217 | IRQ_TYPE_EDGE_BOTH); | |
218 | ret = request_irq(gpio_to_irq(info->charge_gpio), | |
219 | z2_charge_switch_irq, IRQF_DISABLED, | |
220 | "AC Detect", charger); | |
221 | if (ret) | |
222 | goto err3; | |
223 | } | |
224 | ||
225 | ret = z2_batt_ps_init(charger, props); | |
226 | if (ret) | |
227 | goto err3; | |
228 | ||
229 | INIT_WORK(&charger->bat_work, z2_batt_work); | |
230 | ||
231 | ret = power_supply_register(&client->dev, &charger->batt_ps); | |
232 | if (ret) | |
233 | goto err4; | |
234 | ||
235 | schedule_work(&charger->bat_work); | |
236 | ||
237 | return 0; | |
238 | ||
239 | err4: | |
240 | kfree(charger->batt_ps.properties); | |
241 | err3: | |
242 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) | |
243 | free_irq(gpio_to_irq(info->charge_gpio), charger); | |
244 | err2: | |
245 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) | |
246 | gpio_free(info->charge_gpio); | |
247 | err: | |
248 | kfree(charger); | |
249 | return ret; | |
250 | } | |
251 | ||
252 | static int __devexit z2_batt_remove(struct i2c_client *client) | |
253 | { | |
254 | struct z2_charger *charger = i2c_get_clientdata(client); | |
255 | struct z2_battery_info *info = charger->info; | |
256 | ||
257 | flush_scheduled_work(); | |
258 | power_supply_unregister(&charger->batt_ps); | |
259 | ||
260 | kfree(charger->batt_ps.properties); | |
261 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) { | |
262 | free_irq(gpio_to_irq(info->charge_gpio), charger); | |
263 | gpio_free(info->charge_gpio); | |
264 | } | |
265 | ||
266 | kfree(charger); | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | #ifdef CONFIG_PM | |
272 | static int z2_batt_suspend(struct i2c_client *client, pm_message_t state) | |
273 | { | |
274 | flush_scheduled_work(); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | static int z2_batt_resume(struct i2c_client *client) | |
279 | { | |
280 | struct z2_charger *charger = i2c_get_clientdata(client); | |
281 | ||
282 | schedule_work(&charger->bat_work); | |
283 | return 0; | |
284 | } | |
285 | #else | |
286 | #define z2_batt_suspend NULL | |
287 | #define z2_batt_resume NULL | |
288 | #endif | |
289 | ||
290 | static const struct i2c_device_id z2_batt_id[] = { | |
291 | { "aer915", 0 }, | |
292 | { } | |
293 | }; | |
294 | ||
295 | static struct i2c_driver z2_batt_driver = { | |
296 | .driver = { | |
297 | .name = "z2-battery", | |
298 | .owner = THIS_MODULE, | |
299 | }, | |
300 | .probe = z2_batt_probe, | |
301 | .remove = z2_batt_remove, | |
302 | .suspend = z2_batt_suspend, | |
303 | .resume = z2_batt_resume, | |
304 | .id_table = z2_batt_id, | |
305 | }; | |
306 | ||
307 | static int __init z2_batt_init(void) | |
308 | { | |
309 | return i2c_add_driver(&z2_batt_driver); | |
310 | } | |
311 | ||
312 | static void __exit z2_batt_exit(void) | |
313 | { | |
314 | i2c_del_driver(&z2_batt_driver); | |
315 | } | |
316 | ||
317 | module_init(z2_batt_init); | |
318 | module_exit(z2_batt_exit); | |
319 | ||
320 | MODULE_LICENSE("GPL"); | |
321 | MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>"); | |
322 | MODULE_DESCRIPTION("Zipit Z2 battery driver"); |