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Linux/drivers/power/wm97xx_battery.c

  1 /*
  2  * linux/drivers/power/wm97xx_battery.c
  3  *
  4  * Battery measurement code for WM97xx
  5  *
  6  * based on tosa_battery.c
  7  *
  8  * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
  9  *
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License version 2 as
 12  * published by the Free Software Foundation.
 13  *
 14  */
 15 
 16 #include <linux/init.h>
 17 #include <linux/kernel.h>
 18 #include <linux/module.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/power_supply.h>
 21 #include <linux/wm97xx.h>
 22 #include <linux/spinlock.h>
 23 #include <linux/interrupt.h>
 24 #include <linux/gpio.h>
 25 #include <linux/irq.h>
 26 #include <linux/slab.h>
 27 
 28 static struct work_struct bat_work;
 29 static DEFINE_MUTEX(work_lock);
 30 static int bat_status = POWER_SUPPLY_STATUS_UNKNOWN;
 31 static enum power_supply_property *prop;
 32 
 33 static unsigned long wm97xx_read_bat(struct power_supply *bat_ps)
 34 {
 35         struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
 36         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
 37 
 38         return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
 39                                         pdata->batt_aux) * pdata->batt_mult /
 40                                         pdata->batt_div;
 41 }
 42 
 43 static unsigned long wm97xx_read_temp(struct power_supply *bat_ps)
 44 {
 45         struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
 46         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
 47 
 48         return wm97xx_read_aux_adc(dev_get_drvdata(bat_ps->dev->parent),
 49                                         pdata->temp_aux) * pdata->temp_mult /
 50                                         pdata->temp_div;
 51 }
 52 
 53 static int wm97xx_bat_get_property(struct power_supply *bat_ps,
 54                             enum power_supply_property psp,
 55                             union power_supply_propval *val)
 56 {
 57         struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
 58         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
 59 
 60         switch (psp) {
 61         case POWER_SUPPLY_PROP_STATUS:
 62                 val->intval = bat_status;
 63                 break;
 64         case POWER_SUPPLY_PROP_TECHNOLOGY:
 65                 val->intval = pdata->batt_tech;
 66                 break;
 67         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 68                 if (pdata->batt_aux >= 0)
 69                         val->intval = wm97xx_read_bat(bat_ps);
 70                 else
 71                         return -EINVAL;
 72                 break;
 73         case POWER_SUPPLY_PROP_TEMP:
 74                 if (pdata->temp_aux >= 0)
 75                         val->intval = wm97xx_read_temp(bat_ps);
 76                 else
 77                         return -EINVAL;
 78                 break;
 79         case POWER_SUPPLY_PROP_VOLTAGE_MAX:
 80                 if (pdata->max_voltage >= 0)
 81                         val->intval = pdata->max_voltage;
 82                 else
 83                         return -EINVAL;
 84                 break;
 85         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 86                 if (pdata->min_voltage >= 0)
 87                         val->intval = pdata->min_voltage;
 88                 else
 89                         return -EINVAL;
 90                 break;
 91         case POWER_SUPPLY_PROP_PRESENT:
 92                 val->intval = 1;
 93                 break;
 94         default:
 95                 return -EINVAL;
 96         }
 97         return 0;
 98 }
 99 
100 static void wm97xx_bat_external_power_changed(struct power_supply *bat_ps)
101 {
102         schedule_work(&bat_work);
103 }
104 
105 static void wm97xx_bat_update(struct power_supply *bat_ps)
106 {
107         int old_status = bat_status;
108         struct wm97xx_pdata *wmdata = bat_ps->dev->parent->platform_data;
109         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
110 
111         mutex_lock(&work_lock);
112 
113         bat_status = (pdata->charge_gpio >= 0) ?
114                         (gpio_get_value(pdata->charge_gpio) ?
115                         POWER_SUPPLY_STATUS_DISCHARGING :
116                         POWER_SUPPLY_STATUS_CHARGING) :
117                         POWER_SUPPLY_STATUS_UNKNOWN;
118 
119         if (old_status != bat_status) {
120                 pr_debug("%s: %i -> %i\n", bat_ps->name, old_status,
121                                         bat_status);
122                 power_supply_changed(bat_ps);
123         }
124 
125         mutex_unlock(&work_lock);
126 }
127 
128 static struct power_supply bat_ps = {
129         .type                   = POWER_SUPPLY_TYPE_BATTERY,
130         .get_property           = wm97xx_bat_get_property,
131         .external_power_changed = wm97xx_bat_external_power_changed,
132         .use_for_apm            = 1,
133 };
134 
135 static void wm97xx_bat_work(struct work_struct *work)
136 {
137         wm97xx_bat_update(&bat_ps);
138 }
139 
140 static irqreturn_t wm97xx_chrg_irq(int irq, void *data)
141 {
142         schedule_work(&bat_work);
143         return IRQ_HANDLED;
144 }
145 
146 #ifdef CONFIG_PM
147 static int wm97xx_bat_suspend(struct device *dev)
148 {
149         flush_work(&bat_work);
150         return 0;
151 }
152 
153 static int wm97xx_bat_resume(struct device *dev)
154 {
155         schedule_work(&bat_work);
156         return 0;
157 }
158 
159 static const struct dev_pm_ops wm97xx_bat_pm_ops = {
160         .suspend        = wm97xx_bat_suspend,
161         .resume         = wm97xx_bat_resume,
162 };
163 #endif
164 
165 static int wm97xx_bat_probe(struct platform_device *dev)
166 {
167         int ret = 0;
168         int props = 1;  /* POWER_SUPPLY_PROP_PRESENT */
169         int i = 0;
170         struct wm97xx_pdata *wmdata = dev->dev.platform_data;
171         struct wm97xx_batt_pdata *pdata;
172 
173         if (!wmdata) {
174                 dev_err(&dev->dev, "No platform data supplied\n");
175                 return -EINVAL;
176         }
177 
178         pdata = wmdata->batt_pdata;
179 
180         if (dev->id != -1)
181                 return -EINVAL;
182 
183         if (!pdata) {
184                 dev_err(&dev->dev, "No platform_data supplied\n");
185                 return -EINVAL;
186         }
187 
188         if (gpio_is_valid(pdata->charge_gpio)) {
189                 ret = gpio_request(pdata->charge_gpio, "BATT CHRG");
190                 if (ret)
191                         goto err;
192                 ret = gpio_direction_input(pdata->charge_gpio);
193                 if (ret)
194                         goto err2;
195                 ret = request_irq(gpio_to_irq(pdata->charge_gpio),
196                                 wm97xx_chrg_irq, 0,
197                                 "AC Detect", dev);
198                 if (ret)
199                         goto err2;
200                 props++;        /* POWER_SUPPLY_PROP_STATUS */
201         }
202 
203         if (pdata->batt_tech >= 0)
204                 props++;        /* POWER_SUPPLY_PROP_TECHNOLOGY */
205         if (pdata->temp_aux >= 0)
206                 props++;        /* POWER_SUPPLY_PROP_TEMP */
207         if (pdata->batt_aux >= 0)
208                 props++;        /* POWER_SUPPLY_PROP_VOLTAGE_NOW */
209         if (pdata->max_voltage >= 0)
210                 props++;        /* POWER_SUPPLY_PROP_VOLTAGE_MAX */
211         if (pdata->min_voltage >= 0)
212                 props++;        /* POWER_SUPPLY_PROP_VOLTAGE_MIN */
213 
214         prop = kzalloc(props * sizeof(*prop), GFP_KERNEL);
215         if (!prop) {
216                 ret = -ENOMEM;
217                 goto err3;
218         }
219 
220         prop[i++] = POWER_SUPPLY_PROP_PRESENT;
221         if (pdata->charge_gpio >= 0)
222                 prop[i++] = POWER_SUPPLY_PROP_STATUS;
223         if (pdata->batt_tech >= 0)
224                 prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY;
225         if (pdata->temp_aux >= 0)
226                 prop[i++] = POWER_SUPPLY_PROP_TEMP;
227         if (pdata->batt_aux >= 0)
228                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW;
229         if (pdata->max_voltage >= 0)
230                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX;
231         if (pdata->min_voltage >= 0)
232                 prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN;
233 
234         INIT_WORK(&bat_work, wm97xx_bat_work);
235 
236         if (!pdata->batt_name) {
237                 dev_info(&dev->dev, "Please consider setting proper battery "
238                                 "name in platform definition file, falling "
239                                 "back to name \"wm97xx-batt\"\n");
240                 bat_ps.name = "wm97xx-batt";
241         } else
242                 bat_ps.name = pdata->batt_name;
243 
244         bat_ps.properties = prop;
245         bat_ps.num_properties = props;
246 
247         ret = power_supply_register(&dev->dev, &bat_ps);
248         if (!ret)
249                 schedule_work(&bat_work);
250         else
251                 goto err4;
252 
253         return 0;
254 err4:
255         kfree(prop);
256 err3:
257         if (gpio_is_valid(pdata->charge_gpio))
258                 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
259 err2:
260         if (gpio_is_valid(pdata->charge_gpio))
261                 gpio_free(pdata->charge_gpio);
262 err:
263         return ret;
264 }
265 
266 static int wm97xx_bat_remove(struct platform_device *dev)
267 {
268         struct wm97xx_pdata *wmdata = dev->dev.platform_data;
269         struct wm97xx_batt_pdata *pdata = wmdata->batt_pdata;
270 
271         if (pdata && gpio_is_valid(pdata->charge_gpio)) {
272                 free_irq(gpio_to_irq(pdata->charge_gpio), dev);
273                 gpio_free(pdata->charge_gpio);
274         }
275         cancel_work_sync(&bat_work);
276         power_supply_unregister(&bat_ps);
277         kfree(prop);
278         return 0;
279 }
280 
281 static struct platform_driver wm97xx_bat_driver = {
282         .driver = {
283                 .name   = "wm97xx-battery",
284                 .owner  = THIS_MODULE,
285 #ifdef CONFIG_PM
286                 .pm     = &wm97xx_bat_pm_ops,
287 #endif
288         },
289         .probe          = wm97xx_bat_probe,
290         .remove         = wm97xx_bat_remove,
291 };
292 
293 module_platform_driver(wm97xx_bat_driver);
294 
295 MODULE_LICENSE("GPL");
296 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
297 MODULE_DESCRIPTION("WM97xx battery driver");
298 

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