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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 | ||
a223246f VK |
137 | if (info->charge_gpio >= 0) |
138 | props++; /* POWER_SUPPLY_PROP_STATUS */ | |
e3e8d1c9 MV |
139 | if (info->batt_tech >= 0) |
140 | props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */ | |
141 | if (info->batt_I2C_reg >= 0) | |
142 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */ | |
143 | if (info->max_voltage >= 0) | |
144 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */ | |
145 | if (info->min_voltage >= 0) | |
146 | props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */ | |
147 | ||
148 | prop = kzalloc(props * sizeof(*prop), GFP_KERNEL); | |
149 | if (!prop) | |
150 | return -ENOMEM; | |
151 | ||
152 | prop[i++] = POWER_SUPPLY_PROP_PRESENT; | |
153 | if (info->charge_gpio >= 0) | |
154 | prop[i++] = POWER_SUPPLY_PROP_STATUS; | |
155 | if (info->batt_tech >= 0) | |
156 | prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY; | |
157 | if (info->batt_I2C_reg >= 0) | |
158 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW; | |
159 | if (info->max_voltage >= 0) | |
160 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX; | |
161 | if (info->min_voltage >= 0) | |
162 | prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN; | |
163 | ||
164 | if (!info->batt_name) { | |
165 | dev_info(&charger->client->dev, | |
166 | "Please consider setting proper battery " | |
167 | "name in platform definition file, falling " | |
168 | "back to name \" Z2_DEFAULT_NAME \"\n"); | |
169 | charger->batt_ps.name = Z2_DEFAULT_NAME; | |
170 | } else | |
171 | charger->batt_ps.name = info->batt_name; | |
172 | ||
173 | charger->batt_ps.properties = prop; | |
174 | charger->batt_ps.num_properties = props; | |
175 | charger->batt_ps.type = POWER_SUPPLY_TYPE_BATTERY; | |
176 | charger->batt_ps.get_property = z2_batt_get_property; | |
177 | charger->batt_ps.external_power_changed = z2_batt_ext_power_changed; | |
178 | charger->batt_ps.use_for_apm = 1; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int __devinit z2_batt_probe(struct i2c_client *client, | |
184 | const struct i2c_device_id *id) | |
185 | { | |
186 | int ret = 0; | |
187 | int props = 1; /* POWER_SUPPLY_PROP_PRESENT */ | |
188 | struct z2_charger *charger; | |
189 | struct z2_battery_info *info = client->dev.platform_data; | |
190 | ||
191 | if (info == NULL) { | |
192 | dev_err(&client->dev, | |
193 | "Please set platform device platform_data" | |
194 | " to a valid z2_battery_info pointer!\n"); | |
195 | return -EINVAL; | |
196 | } | |
197 | ||
198 | charger = kzalloc(sizeof(*charger), GFP_KERNEL); | |
199 | if (charger == NULL) | |
200 | return -ENOMEM; | |
201 | ||
202 | charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN; | |
203 | charger->info = info; | |
204 | charger->client = client; | |
205 | i2c_set_clientdata(client, charger); | |
206 | ||
207 | mutex_init(&charger->work_lock); | |
208 | ||
209 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) { | |
210 | ret = gpio_request(info->charge_gpio, "BATT CHRG"); | |
211 | if (ret) | |
212 | goto err; | |
213 | ||
214 | ret = gpio_direction_input(info->charge_gpio); | |
215 | if (ret) | |
216 | goto err2; | |
217 | ||
dced35ae TG |
218 | irq_set_irq_type(gpio_to_irq(info->charge_gpio), |
219 | IRQ_TYPE_EDGE_BOTH); | |
e3e8d1c9 | 220 | ret = request_irq(gpio_to_irq(info->charge_gpio), |
3b176b25 | 221 | z2_charge_switch_irq, 0, |
e3e8d1c9 MV |
222 | "AC Detect", charger); |
223 | if (ret) | |
224 | goto err3; | |
225 | } | |
226 | ||
227 | ret = z2_batt_ps_init(charger, props); | |
228 | if (ret) | |
229 | goto err3; | |
230 | ||
231 | INIT_WORK(&charger->bat_work, z2_batt_work); | |
232 | ||
233 | ret = power_supply_register(&client->dev, &charger->batt_ps); | |
234 | if (ret) | |
235 | goto err4; | |
236 | ||
237 | schedule_work(&charger->bat_work); | |
238 | ||
239 | return 0; | |
240 | ||
241 | err4: | |
242 | kfree(charger->batt_ps.properties); | |
243 | err3: | |
244 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) | |
245 | free_irq(gpio_to_irq(info->charge_gpio), charger); | |
246 | err2: | |
247 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) | |
248 | gpio_free(info->charge_gpio); | |
249 | err: | |
250 | kfree(charger); | |
251 | return ret; | |
252 | } | |
253 | ||
254 | static int __devexit z2_batt_remove(struct i2c_client *client) | |
255 | { | |
256 | struct z2_charger *charger = i2c_get_clientdata(client); | |
257 | struct z2_battery_info *info = charger->info; | |
258 | ||
bc51e7ff | 259 | cancel_work_sync(&charger->bat_work); |
e3e8d1c9 MV |
260 | power_supply_unregister(&charger->batt_ps); |
261 | ||
262 | kfree(charger->batt_ps.properties); | |
263 | if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) { | |
264 | free_irq(gpio_to_irq(info->charge_gpio), charger); | |
265 | gpio_free(info->charge_gpio); | |
266 | } | |
267 | ||
268 | kfree(charger); | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | #ifdef CONFIG_PM | |
906649de | 274 | static int z2_batt_suspend(struct device *dev) |
e3e8d1c9 | 275 | { |
906649de | 276 | struct i2c_client *client = to_i2c_client(dev); |
bc51e7ff TH |
277 | struct z2_charger *charger = i2c_get_clientdata(client); |
278 | ||
279 | flush_work_sync(&charger->bat_work); | |
e3e8d1c9 MV |
280 | return 0; |
281 | } | |
282 | ||
906649de | 283 | static int z2_batt_resume(struct device *dev) |
e3e8d1c9 | 284 | { |
906649de | 285 | struct i2c_client *client = to_i2c_client(dev); |
e3e8d1c9 MV |
286 | struct z2_charger *charger = i2c_get_clientdata(client); |
287 | ||
288 | schedule_work(&charger->bat_work); | |
289 | return 0; | |
290 | } | |
906649de MV |
291 | |
292 | static const struct dev_pm_ops z2_battery_pm_ops = { | |
293 | .suspend = z2_batt_suspend, | |
294 | .resume = z2_batt_resume, | |
295 | }; | |
296 | ||
297 | #define Z2_BATTERY_PM_OPS (&z2_battery_pm_ops) | |
298 | ||
e3e8d1c9 | 299 | #else |
906649de | 300 | #define Z2_BATTERY_PM_OPS (NULL) |
e3e8d1c9 MV |
301 | #endif |
302 | ||
303 | static const struct i2c_device_id z2_batt_id[] = { | |
304 | { "aer915", 0 }, | |
305 | { } | |
306 | }; | |
dcbc9169 | 307 | MODULE_DEVICE_TABLE(i2c, z2_batt_id); |
e3e8d1c9 MV |
308 | |
309 | static struct i2c_driver z2_batt_driver = { | |
310 | .driver = { | |
311 | .name = "z2-battery", | |
312 | .owner = THIS_MODULE, | |
906649de | 313 | .pm = Z2_BATTERY_PM_OPS |
e3e8d1c9 MV |
314 | }, |
315 | .probe = z2_batt_probe, | |
0bea4b86 | 316 | .remove = __devexit_p(z2_batt_remove), |
e3e8d1c9 MV |
317 | .id_table = z2_batt_id, |
318 | }; | |
5ff92e7a | 319 | module_i2c_driver(z2_batt_driver); |
e3e8d1c9 MV |
320 | |
321 | MODULE_LICENSE("GPL"); | |
322 | MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>"); | |
323 | MODULE_DESCRIPTION("Zipit Z2 battery driver"); |