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Linux/drivers/power/max8903_charger.c

  1 /*
  2  * max8903_charger.c - Maxim 8903 USB/Adapter Charger Driver
  3  *
  4  * Copyright (C) 2011 Samsung Electronics
  5  * MyungJoo Ham <myungjoo.ham@samsung.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 20  *
 21  */
 22 
 23 #include <linux/gpio.h>
 24 #include <linux/interrupt.h>
 25 #include <linux/module.h>
 26 #include <linux/slab.h>
 27 #include <linux/power_supply.h>
 28 #include <linux/platform_device.h>
 29 #include <linux/power/max8903_charger.h>
 30 
 31 struct max8903_data {
 32         struct max8903_pdata pdata;
 33         struct device *dev;
 34         struct power_supply psy;
 35         bool fault;
 36         bool usb_in;
 37         bool ta_in;
 38 };
 39 
 40 static enum power_supply_property max8903_charger_props[] = {
 41         POWER_SUPPLY_PROP_STATUS, /* Charger status output */
 42         POWER_SUPPLY_PROP_ONLINE, /* External power source */
 43         POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
 44 };
 45 
 46 static int max8903_get_property(struct power_supply *psy,
 47                 enum power_supply_property psp,
 48                 union power_supply_propval *val)
 49 {
 50         struct max8903_data *data = container_of(psy,
 51                         struct max8903_data, psy);
 52 
 53         switch (psp) {
 54         case POWER_SUPPLY_PROP_STATUS:
 55                 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 56                 if (data->pdata.chg) {
 57                         if (gpio_get_value(data->pdata.chg) == 0)
 58                                 val->intval = POWER_SUPPLY_STATUS_CHARGING;
 59                         else if (data->usb_in || data->ta_in)
 60                                 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 61                         else
 62                                 val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 63                 }
 64                 break;
 65         case POWER_SUPPLY_PROP_ONLINE:
 66                 val->intval = 0;
 67                 if (data->usb_in || data->ta_in)
 68                         val->intval = 1;
 69                 break;
 70         case POWER_SUPPLY_PROP_HEALTH:
 71                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 72                 if (data->fault)
 73                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 74                 break;
 75         default:
 76                 return -EINVAL;
 77         }
 78         return 0;
 79 }
 80 
 81 static irqreturn_t max8903_dcin(int irq, void *_data)
 82 {
 83         struct max8903_data *data = _data;
 84         struct max8903_pdata *pdata = &data->pdata;
 85         bool ta_in;
 86         enum power_supply_type old_type;
 87 
 88         ta_in = gpio_get_value(pdata->dok) ? false : true;
 89 
 90         if (ta_in == data->ta_in)
 91                 return IRQ_HANDLED;
 92 
 93         data->ta_in = ta_in;
 94 
 95         /* Set Current-Limit-Mode 1:DC 0:USB */
 96         if (pdata->dcm)
 97                 gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
 98 
 99         /* Charger Enable / Disable (cen is negated) */
100         if (pdata->cen)
101                 gpio_set_value(pdata->cen, ta_in ? 0 :
102                                 (data->usb_in ? 0 : 1));
103 
104         dev_dbg(data->dev, "TA(DC-IN) Charger %s.\n", ta_in ?
105                         "Connected" : "Disconnected");
106 
107         old_type = data->psy.type;
108 
109         if (data->ta_in)
110                 data->psy.type = POWER_SUPPLY_TYPE_MAINS;
111         else if (data->usb_in)
112                 data->psy.type = POWER_SUPPLY_TYPE_USB;
113         else
114                 data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
115 
116         if (old_type != data->psy.type)
117                 power_supply_changed(&data->psy);
118 
119         return IRQ_HANDLED;
120 }
121 
122 static irqreturn_t max8903_usbin(int irq, void *_data)
123 {
124         struct max8903_data *data = _data;
125         struct max8903_pdata *pdata = &data->pdata;
126         bool usb_in;
127         enum power_supply_type old_type;
128 
129         usb_in = gpio_get_value(pdata->uok) ? false : true;
130 
131         if (usb_in == data->usb_in)
132                 return IRQ_HANDLED;
133 
134         data->usb_in = usb_in;
135 
136         /* Do not touch Current-Limit-Mode */
137 
138         /* Charger Enable / Disable (cen is negated) */
139         if (pdata->cen)
140                 gpio_set_value(pdata->cen, usb_in ? 0 :
141                                 (data->ta_in ? 0 : 1));
142 
143         dev_dbg(data->dev, "USB Charger %s.\n", usb_in ?
144                         "Connected" : "Disconnected");
145 
146         old_type = data->psy.type;
147 
148         if (data->ta_in)
149                 data->psy.type = POWER_SUPPLY_TYPE_MAINS;
150         else if (data->usb_in)
151                 data->psy.type = POWER_SUPPLY_TYPE_USB;
152         else
153                 data->psy.type = POWER_SUPPLY_TYPE_BATTERY;
154 
155         if (old_type != data->psy.type)
156                 power_supply_changed(&data->psy);
157 
158         return IRQ_HANDLED;
159 }
160 
161 static irqreturn_t max8903_fault(int irq, void *_data)
162 {
163         struct max8903_data *data = _data;
164         struct max8903_pdata *pdata = &data->pdata;
165         bool fault;
166 
167         fault = gpio_get_value(pdata->flt) ? false : true;
168 
169         if (fault == data->fault)
170                 return IRQ_HANDLED;
171 
172         data->fault = fault;
173 
174         if (fault)
175                 dev_err(data->dev, "Charger suffers a fault and stops.\n");
176         else
177                 dev_err(data->dev, "Charger recovered from a fault.\n");
178 
179         return IRQ_HANDLED;
180 }
181 
182 static int max8903_probe(struct platform_device *pdev)
183 {
184         struct max8903_data *data;
185         struct device *dev = &pdev->dev;
186         struct max8903_pdata *pdata = pdev->dev.platform_data;
187         int ret = 0;
188         int gpio;
189         int ta_in = 0;
190         int usb_in = 0;
191 
192         data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
193         if (data == NULL) {
194                 dev_err(dev, "Cannot allocate memory.\n");
195                 return -ENOMEM;
196         }
197         memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata));
198         data->dev = dev;
199         platform_set_drvdata(pdev, data);
200 
201         if (pdata->dc_valid == false && pdata->usb_valid == false) {
202                 dev_err(dev, "No valid power sources.\n");
203                 ret = -EINVAL;
204                 goto err;
205         }
206 
207         if (pdata->dc_valid) {
208                 if (pdata->dok && gpio_is_valid(pdata->dok) &&
209                                 pdata->dcm && gpio_is_valid(pdata->dcm)) {
210                         gpio = pdata->dok; /* PULL_UPed Interrupt */
211                         ta_in = gpio_get_value(gpio) ? 0 : 1;
212 
213                         gpio = pdata->dcm; /* Output */
214                         gpio_set_value(gpio, ta_in);
215                 } else {
216                         dev_err(dev, "When DC is wired, DOK and DCM should"
217                                         " be wired as well.\n");
218                         ret = -EINVAL;
219                         goto err;
220                 }
221         } else {
222                 if (pdata->dcm) {
223                         if (gpio_is_valid(pdata->dcm))
224                                 gpio_set_value(pdata->dcm, 0);
225                         else {
226                                 dev_err(dev, "Invalid pin: dcm.\n");
227                                 ret = -EINVAL;
228                                 goto err;
229                         }
230                 }
231         }
232 
233         if (pdata->usb_valid) {
234                 if (pdata->uok && gpio_is_valid(pdata->uok)) {
235                         gpio = pdata->uok;
236                         usb_in = gpio_get_value(gpio) ? 0 : 1;
237                 } else {
238                         dev_err(dev, "When USB is wired, UOK should be wired."
239                                         "as well.\n");
240                         ret = -EINVAL;
241                         goto err;
242                 }
243         }
244 
245         if (pdata->cen) {
246                 if (gpio_is_valid(pdata->cen)) {
247                         gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
248                 } else {
249                         dev_err(dev, "Invalid pin: cen.\n");
250                         ret = -EINVAL;
251                         goto err;
252                 }
253         }
254 
255         if (pdata->chg) {
256                 if (!gpio_is_valid(pdata->chg)) {
257                         dev_err(dev, "Invalid pin: chg.\n");
258                         ret = -EINVAL;
259                         goto err;
260                 }
261         }
262 
263         if (pdata->flt) {
264                 if (!gpio_is_valid(pdata->flt)) {
265                         dev_err(dev, "Invalid pin: flt.\n");
266                         ret = -EINVAL;
267                         goto err;
268                 }
269         }
270 
271         if (pdata->usus) {
272                 if (!gpio_is_valid(pdata->usus)) {
273                         dev_err(dev, "Invalid pin: usus.\n");
274                         ret = -EINVAL;
275                         goto err;
276                 }
277         }
278 
279         data->fault = false;
280         data->ta_in = ta_in;
281         data->usb_in = usb_in;
282 
283         data->psy.name = "max8903_charger";
284         data->psy.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
285                         ((usb_in) ? POWER_SUPPLY_TYPE_USB :
286                          POWER_SUPPLY_TYPE_BATTERY);
287         data->psy.get_property = max8903_get_property;
288         data->psy.properties = max8903_charger_props;
289         data->psy.num_properties = ARRAY_SIZE(max8903_charger_props);
290 
291         ret = power_supply_register(dev, &data->psy);
292         if (ret) {
293                 dev_err(dev, "failed: power supply register.\n");
294                 goto err;
295         }
296 
297         if (pdata->dc_valid) {
298                 ret = request_threaded_irq(gpio_to_irq(pdata->dok),
299                                 NULL, max8903_dcin,
300                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
301                                 "MAX8903 DC IN", data);
302                 if (ret) {
303                         dev_err(dev, "Cannot request irq %d for DC (%d)\n",
304                                         gpio_to_irq(pdata->dok), ret);
305                         goto err_psy;
306                 }
307         }
308 
309         if (pdata->usb_valid) {
310                 ret = request_threaded_irq(gpio_to_irq(pdata->uok),
311                                 NULL, max8903_usbin,
312                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
313                                 "MAX8903 USB IN", data);
314                 if (ret) {
315                         dev_err(dev, "Cannot request irq %d for USB (%d)\n",
316                                         gpio_to_irq(pdata->uok), ret);
317                         goto err_dc_irq;
318                 }
319         }
320 
321         if (pdata->flt) {
322                 ret = request_threaded_irq(gpio_to_irq(pdata->flt),
323                                 NULL, max8903_fault,
324                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
325                                 "MAX8903 Fault", data);
326                 if (ret) {
327                         dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
328                                         gpio_to_irq(pdata->flt), ret);
329                         goto err_usb_irq;
330                 }
331         }
332 
333         return 0;
334 
335 err_usb_irq:
336         if (pdata->usb_valid)
337                 free_irq(gpio_to_irq(pdata->uok), data);
338 err_dc_irq:
339         if (pdata->dc_valid)
340                 free_irq(gpio_to_irq(pdata->dok), data);
341 err_psy:
342         power_supply_unregister(&data->psy);
343 err:
344         return ret;
345 }
346 
347 static int max8903_remove(struct platform_device *pdev)
348 {
349         struct max8903_data *data = platform_get_drvdata(pdev);
350 
351         if (data) {
352                 struct max8903_pdata *pdata = &data->pdata;
353 
354                 if (pdata->flt)
355                         free_irq(gpio_to_irq(pdata->flt), data);
356                 if (pdata->usb_valid)
357                         free_irq(gpio_to_irq(pdata->uok), data);
358                 if (pdata->dc_valid)
359                         free_irq(gpio_to_irq(pdata->dok), data);
360                 power_supply_unregister(&data->psy);
361         }
362 
363         return 0;
364 }
365 
366 static struct platform_driver max8903_driver = {
367         .probe  = max8903_probe,
368         .remove = max8903_remove,
369         .driver = {
370                 .name   = "max8903-charger",
371                 .owner  = THIS_MODULE,
372         },
373 };
374 
375 module_platform_driver(max8903_driver);
376 
377 MODULE_LICENSE("GPL");
378 MODULE_DESCRIPTION("MAX8903 Charger Driver");
379 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
380 MODULE_ALIAS("platform:max8903-charger");
381 

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