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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         struct power_supply_desc psy_desc;
 36         bool fault;
 37         bool usb_in;
 38         bool ta_in;
 39 };
 40 
 41 static enum power_supply_property max8903_charger_props[] = {
 42         POWER_SUPPLY_PROP_STATUS, /* Charger status output */
 43         POWER_SUPPLY_PROP_ONLINE, /* External power source */
 44         POWER_SUPPLY_PROP_HEALTH, /* Fault or OK */
 45 };
 46 
 47 static int max8903_get_property(struct power_supply *psy,
 48                 enum power_supply_property psp,
 49                 union power_supply_propval *val)
 50 {
 51         struct max8903_data *data = power_supply_get_drvdata(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_desc.type;
108 
109         if (data->ta_in)
110                 data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
111         else if (data->usb_in)
112                 data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
113         else
114                 data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
115 
116         if (old_type != data->psy_desc.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_desc.type;
147 
148         if (data->ta_in)
149                 data->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
150         else if (data->usb_in)
151                 data->psy_desc.type = POWER_SUPPLY_TYPE_USB;
152         else
153                 data->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
154 
155         if (old_type != data->psy_desc.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         struct power_supply_config psy_cfg = {};
188         int ret = 0;
189         int gpio;
190         int ta_in = 0;
191         int usb_in = 0;
192 
193         data = devm_kzalloc(dev, sizeof(struct max8903_data), GFP_KERNEL);
194         if (data == NULL) {
195                 dev_err(dev, "Cannot allocate memory.\n");
196                 return -ENOMEM;
197         }
198         memcpy(&data->pdata, pdata, sizeof(struct max8903_pdata));
199         data->dev = dev;
200         platform_set_drvdata(pdev, data);
201 
202         if (pdata->dc_valid == false && pdata->usb_valid == false) {
203                 dev_err(dev, "No valid power sources.\n");
204                 ret = -EINVAL;
205                 goto err;
206         }
207 
208         if (pdata->dc_valid) {
209                 if (pdata->dok && gpio_is_valid(pdata->dok) &&
210                                 pdata->dcm && gpio_is_valid(pdata->dcm)) {
211                         gpio = pdata->dok; /* PULL_UPed Interrupt */
212                         ta_in = gpio_get_value(gpio) ? 0 : 1;
213 
214                         gpio = pdata->dcm; /* Output */
215                         gpio_set_value(gpio, ta_in);
216                 } else {
217                         dev_err(dev, "When DC is wired, DOK and DCM should"
218                                         " be wired as well.\n");
219                         ret = -EINVAL;
220                         goto err;
221                 }
222         } else {
223                 if (pdata->dcm) {
224                         if (gpio_is_valid(pdata->dcm))
225                                 gpio_set_value(pdata->dcm, 0);
226                         else {
227                                 dev_err(dev, "Invalid pin: dcm.\n");
228                                 ret = -EINVAL;
229                                 goto err;
230                         }
231                 }
232         }
233 
234         if (pdata->usb_valid) {
235                 if (pdata->uok && gpio_is_valid(pdata->uok)) {
236                         gpio = pdata->uok;
237                         usb_in = gpio_get_value(gpio) ? 0 : 1;
238                 } else {
239                         dev_err(dev, "When USB is wired, UOK should be wired."
240                                         "as well.\n");
241                         ret = -EINVAL;
242                         goto err;
243                 }
244         }
245 
246         if (pdata->cen) {
247                 if (gpio_is_valid(pdata->cen)) {
248                         gpio_set_value(pdata->cen, (ta_in || usb_in) ? 0 : 1);
249                 } else {
250                         dev_err(dev, "Invalid pin: cen.\n");
251                         ret = -EINVAL;
252                         goto err;
253                 }
254         }
255 
256         if (pdata->chg) {
257                 if (!gpio_is_valid(pdata->chg)) {
258                         dev_err(dev, "Invalid pin: chg.\n");
259                         ret = -EINVAL;
260                         goto err;
261                 }
262         }
263 
264         if (pdata->flt) {
265                 if (!gpio_is_valid(pdata->flt)) {
266                         dev_err(dev, "Invalid pin: flt.\n");
267                         ret = -EINVAL;
268                         goto err;
269                 }
270         }
271 
272         if (pdata->usus) {
273                 if (!gpio_is_valid(pdata->usus)) {
274                         dev_err(dev, "Invalid pin: usus.\n");
275                         ret = -EINVAL;
276                         goto err;
277                 }
278         }
279 
280         data->fault = false;
281         data->ta_in = ta_in;
282         data->usb_in = usb_in;
283 
284         data->psy_desc.name = "max8903_charger";
285         data->psy_desc.type = (ta_in) ? POWER_SUPPLY_TYPE_MAINS :
286                         ((usb_in) ? POWER_SUPPLY_TYPE_USB :
287                          POWER_SUPPLY_TYPE_BATTERY);
288         data->psy_desc.get_property = max8903_get_property;
289         data->psy_desc.properties = max8903_charger_props;
290         data->psy_desc.num_properties = ARRAY_SIZE(max8903_charger_props);
291 
292         psy_cfg.drv_data = data;
293 
294         data->psy = power_supply_register(dev, &data->psy_desc, &psy_cfg);
295         if (IS_ERR(data->psy)) {
296                 dev_err(dev, "failed: power supply register.\n");
297                 ret = PTR_ERR(data->psy);
298                 goto err;
299         }
300 
301         if (pdata->dc_valid) {
302                 ret = request_threaded_irq(gpio_to_irq(pdata->dok),
303                                 NULL, max8903_dcin,
304                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
305                                 "MAX8903 DC IN", data);
306                 if (ret) {
307                         dev_err(dev, "Cannot request irq %d for DC (%d)\n",
308                                         gpio_to_irq(pdata->dok), ret);
309                         goto err_psy;
310                 }
311         }
312 
313         if (pdata->usb_valid) {
314                 ret = request_threaded_irq(gpio_to_irq(pdata->uok),
315                                 NULL, max8903_usbin,
316                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
317                                 "MAX8903 USB IN", data);
318                 if (ret) {
319                         dev_err(dev, "Cannot request irq %d for USB (%d)\n",
320                                         gpio_to_irq(pdata->uok), ret);
321                         goto err_dc_irq;
322                 }
323         }
324 
325         if (pdata->flt) {
326                 ret = request_threaded_irq(gpio_to_irq(pdata->flt),
327                                 NULL, max8903_fault,
328                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
329                                 "MAX8903 Fault", data);
330                 if (ret) {
331                         dev_err(dev, "Cannot request irq %d for Fault (%d)\n",
332                                         gpio_to_irq(pdata->flt), ret);
333                         goto err_usb_irq;
334                 }
335         }
336 
337         return 0;
338 
339 err_usb_irq:
340         if (pdata->usb_valid)
341                 free_irq(gpio_to_irq(pdata->uok), data);
342 err_dc_irq:
343         if (pdata->dc_valid)
344                 free_irq(gpio_to_irq(pdata->dok), data);
345 err_psy:
346         power_supply_unregister(data->psy);
347 err:
348         return ret;
349 }
350 
351 static int max8903_remove(struct platform_device *pdev)
352 {
353         struct max8903_data *data = platform_get_drvdata(pdev);
354 
355         if (data) {
356                 struct max8903_pdata *pdata = &data->pdata;
357 
358                 if (pdata->flt)
359                         free_irq(gpio_to_irq(pdata->flt), data);
360                 if (pdata->usb_valid)
361                         free_irq(gpio_to_irq(pdata->uok), data);
362                 if (pdata->dc_valid)
363                         free_irq(gpio_to_irq(pdata->dok), data);
364                 power_supply_unregister(data->psy);
365         }
366 
367         return 0;
368 }
369 
370 static struct platform_driver max8903_driver = {
371         .probe  = max8903_probe,
372         .remove = max8903_remove,
373         .driver = {
374                 .name   = "max8903-charger",
375         },
376 };
377 
378 module_platform_driver(max8903_driver);
379 
380 MODULE_LICENSE("GPL");
381 MODULE_DESCRIPTION("MAX8903 Charger Driver");
382 MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
383 MODULE_ALIAS("platform:max8903-charger");
384 

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