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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
31struct 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
40static enum power_supply_property max8903_charger_props[] = {
41 POWER_SUPPLY_PROP_STATUS,
42 POWER_SUPPLY_PROP_ONLINE,
43 POWER_SUPPLY_PROP_HEALTH,
44};
45
46static 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
81static 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
96 if (pdata->dcm)
97 gpio_set_value(pdata->dcm, ta_in ? 1 : 0);
98
99
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
122static 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
137
138
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
161static 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
182static 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;
211 ta_in = gpio_get_value(gpio) ? 0 : 1;
212
213 gpio = pdata->dcm;
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
335err_usb_irq:
336 if (pdata->usb_valid)
337 free_irq(gpio_to_irq(pdata->uok), data);
338err_dc_irq:
339 if (pdata->dc_valid)
340 free_irq(gpio_to_irq(pdata->dok), data);
341err_psy:
342 power_supply_unregister(&data->psy);
343err:
344 return ret;
345}
346
347static 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
366static 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
375module_platform_driver(max8903_driver);
376
377MODULE_LICENSE("GPL");
378MODULE_DESCRIPTION("MAX8903 Charger Driver");
379MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
380MODULE_ALIAS("platform:max8903-charger");
381
