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Linux/drivers/power/jz4740-battery.c

  1 /*
  2  * Battery measurement code for Ingenic JZ SOC.
  3  *
  4  * Copyright (C) 2009 Jiejing Zhang <kzjeef@gmail.com>
  5  * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
  6  *
  7  * based on tosa_battery.c
  8  *
  9  * Copyright (C) 2008 Marek Vasut <marek.vasut@gmail.com>
 10 *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License version 2 as
 13  * published by the Free Software Foundation.
 14  *
 15  */
 16 
 17 #include <linux/interrupt.h>
 18 #include <linux/kernel.h>
 19 #include <linux/module.h>
 20 #include <linux/platform_device.h>
 21 #include <linux/slab.h>
 22 #include <linux/io.h>
 23 
 24 #include <linux/delay.h>
 25 #include <linux/err.h>
 26 #include <linux/gpio.h>
 27 #include <linux/mfd/core.h>
 28 #include <linux/power_supply.h>
 29 
 30 #include <linux/power/jz4740-battery.h>
 31 #include <linux/jz4740-adc.h>
 32 
 33 struct jz_battery {
 34         struct jz_battery_platform_data *pdata;
 35         struct platform_device *pdev;
 36 
 37         void __iomem *base;
 38 
 39         int irq;
 40         int charge_irq;
 41 
 42         const struct mfd_cell *cell;
 43 
 44         int status;
 45         long voltage;
 46 
 47         struct completion read_completion;
 48 
 49         struct power_supply *battery;
 50         struct power_supply_desc battery_desc;
 51         struct delayed_work work;
 52 
 53         struct mutex lock;
 54 };
 55 
 56 static inline struct jz_battery *psy_to_jz_battery(struct power_supply *psy)
 57 {
 58         return power_supply_get_drvdata(psy);
 59 }
 60 
 61 static irqreturn_t jz_battery_irq_handler(int irq, void *devid)
 62 {
 63         struct jz_battery *battery = devid;
 64 
 65         complete(&battery->read_completion);
 66         return IRQ_HANDLED;
 67 }
 68 
 69 static long jz_battery_read_voltage(struct jz_battery *battery)
 70 {
 71         long t;
 72         unsigned long val;
 73         long voltage;
 74 
 75         mutex_lock(&battery->lock);
 76 
 77         reinit_completion(&battery->read_completion);
 78 
 79         enable_irq(battery->irq);
 80         battery->cell->enable(battery->pdev);
 81 
 82         t = wait_for_completion_interruptible_timeout(&battery->read_completion,
 83                 HZ);
 84 
 85         if (t > 0) {
 86                 val = readw(battery->base) & 0xfff;
 87 
 88                 if (battery->pdata->info.voltage_max_design <= 2500000)
 89                         val = (val * 78125UL) >> 7UL;
 90                 else
 91                         val = ((val * 924375UL) >> 9UL) + 33000;
 92                 voltage = (long)val;
 93         } else {
 94                 voltage = t ? t : -ETIMEDOUT;
 95         }
 96 
 97         battery->cell->disable(battery->pdev);
 98         disable_irq(battery->irq);
 99 
100         mutex_unlock(&battery->lock);
101 
102         return voltage;
103 }
104 
105 static int jz_battery_get_capacity(struct power_supply *psy)
106 {
107         struct jz_battery *jz_battery = psy_to_jz_battery(psy);
108         struct power_supply_info *info = &jz_battery->pdata->info;
109         long voltage;
110         int ret;
111         int voltage_span;
112 
113         voltage = jz_battery_read_voltage(jz_battery);
114 
115         if (voltage < 0)
116                 return voltage;
117 
118         voltage_span = info->voltage_max_design - info->voltage_min_design;
119         ret = ((voltage - info->voltage_min_design) * 100) / voltage_span;
120 
121         if (ret > 100)
122                 ret = 100;
123         else if (ret < 0)
124                 ret = 0;
125 
126         return ret;
127 }
128 
129 static int jz_battery_get_property(struct power_supply *psy,
130         enum power_supply_property psp, union power_supply_propval *val)
131 {
132         struct jz_battery *jz_battery = psy_to_jz_battery(psy);
133         struct power_supply_info *info = &jz_battery->pdata->info;
134         long voltage;
135 
136         switch (psp) {
137         case POWER_SUPPLY_PROP_STATUS:
138                 val->intval = jz_battery->status;
139                 break;
140         case POWER_SUPPLY_PROP_TECHNOLOGY:
141                 val->intval = jz_battery->pdata->info.technology;
142                 break;
143         case POWER_SUPPLY_PROP_HEALTH:
144                 voltage = jz_battery_read_voltage(jz_battery);
145                 if (voltage < info->voltage_min_design)
146                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
147                 else
148                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
149                 break;
150         case POWER_SUPPLY_PROP_CAPACITY:
151                 val->intval = jz_battery_get_capacity(psy);
152                 break;
153         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
154                 val->intval = jz_battery_read_voltage(jz_battery);
155                 if (val->intval < 0)
156                         return val->intval;
157                 break;
158         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
159                 val->intval = info->voltage_max_design;
160                 break;
161         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
162                 val->intval = info->voltage_min_design;
163                 break;
164         case POWER_SUPPLY_PROP_PRESENT:
165                 val->intval = 1;
166                 break;
167         default:
168                 return -EINVAL;
169         }
170         return 0;
171 }
172 
173 static void jz_battery_external_power_changed(struct power_supply *psy)
174 {
175         struct jz_battery *jz_battery = psy_to_jz_battery(psy);
176 
177         mod_delayed_work(system_wq, &jz_battery->work, 0);
178 }
179 
180 static irqreturn_t jz_battery_charge_irq(int irq, void *data)
181 {
182         struct jz_battery *jz_battery = data;
183 
184         mod_delayed_work(system_wq, &jz_battery->work, 0);
185 
186         return IRQ_HANDLED;
187 }
188 
189 static void jz_battery_update(struct jz_battery *jz_battery)
190 {
191         int status;
192         long voltage;
193         bool has_changed = false;
194         int is_charging;
195 
196         if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
197                 is_charging = gpio_get_value(jz_battery->pdata->gpio_charge);
198                 is_charging ^= jz_battery->pdata->gpio_charge_active_low;
199                 if (is_charging)
200                         status = POWER_SUPPLY_STATUS_CHARGING;
201                 else
202                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
203 
204                 if (status != jz_battery->status) {
205                         jz_battery->status = status;
206                         has_changed = true;
207                 }
208         }
209 
210         voltage = jz_battery_read_voltage(jz_battery);
211         if (abs(voltage - jz_battery->voltage) < 50000) {
212                 jz_battery->voltage = voltage;
213                 has_changed = true;
214         }
215 
216         if (has_changed)
217                 power_supply_changed(jz_battery->battery);
218 }
219 
220 static enum power_supply_property jz_battery_properties[] = {
221         POWER_SUPPLY_PROP_STATUS,
222         POWER_SUPPLY_PROP_TECHNOLOGY,
223         POWER_SUPPLY_PROP_HEALTH,
224         POWER_SUPPLY_PROP_CAPACITY,
225         POWER_SUPPLY_PROP_VOLTAGE_NOW,
226         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
227         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
228         POWER_SUPPLY_PROP_PRESENT,
229 };
230 
231 static void jz_battery_work(struct work_struct *work)
232 {
233         /* Too small interval will increase system workload */
234         const int interval = HZ * 30;
235         struct jz_battery *jz_battery = container_of(work, struct jz_battery,
236                                             work.work);
237 
238         jz_battery_update(jz_battery);
239         schedule_delayed_work(&jz_battery->work, interval);
240 }
241 
242 static int jz_battery_probe(struct platform_device *pdev)
243 {
244         int ret = 0;
245         struct jz_battery_platform_data *pdata = pdev->dev.parent->platform_data;
246         struct power_supply_config psy_cfg = {};
247         struct jz_battery *jz_battery;
248         struct power_supply_desc *battery_desc;
249         struct resource *mem;
250 
251         if (!pdata) {
252                 dev_err(&pdev->dev, "No platform_data supplied\n");
253                 return -ENXIO;
254         }
255 
256         jz_battery = devm_kzalloc(&pdev->dev, sizeof(*jz_battery), GFP_KERNEL);
257         if (!jz_battery) {
258                 dev_err(&pdev->dev, "Failed to allocate driver structure\n");
259                 return -ENOMEM;
260         }
261 
262         jz_battery->cell = mfd_get_cell(pdev);
263 
264         jz_battery->irq = platform_get_irq(pdev, 0);
265         if (jz_battery->irq < 0) {
266                 dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
267                 return jz_battery->irq;
268         }
269 
270         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
271 
272         jz_battery->base = devm_ioremap_resource(&pdev->dev, mem);
273         if (IS_ERR(jz_battery->base))
274                 return PTR_ERR(jz_battery->base);
275 
276         battery_desc = &jz_battery->battery_desc;
277         battery_desc->name = pdata->info.name;
278         battery_desc->type = POWER_SUPPLY_TYPE_BATTERY;
279         battery_desc->properties        = jz_battery_properties;
280         battery_desc->num_properties    = ARRAY_SIZE(jz_battery_properties);
281         battery_desc->get_property      = jz_battery_get_property;
282         battery_desc->external_power_changed =
283                                         jz_battery_external_power_changed;
284         battery_desc->use_for_apm       = 1;
285 
286         psy_cfg.drv_data = jz_battery;
287 
288         jz_battery->pdata = pdata;
289         jz_battery->pdev = pdev;
290 
291         init_completion(&jz_battery->read_completion);
292         mutex_init(&jz_battery->lock);
293 
294         INIT_DELAYED_WORK(&jz_battery->work, jz_battery_work);
295 
296         ret = request_irq(jz_battery->irq, jz_battery_irq_handler, 0, pdev->name,
297                         jz_battery);
298         if (ret) {
299                 dev_err(&pdev->dev, "Failed to request irq %d\n", ret);
300                 return ret;
301         }
302         disable_irq(jz_battery->irq);
303 
304         if (gpio_is_valid(pdata->gpio_charge)) {
305                 ret = gpio_request(pdata->gpio_charge, dev_name(&pdev->dev));
306                 if (ret) {
307                         dev_err(&pdev->dev, "charger state gpio request failed.\n");
308                         goto err_free_irq;
309                 }
310                 ret = gpio_direction_input(pdata->gpio_charge);
311                 if (ret) {
312                         dev_err(&pdev->dev, "charger state gpio set direction failed.\n");
313                         goto err_free_gpio;
314                 }
315 
316                 jz_battery->charge_irq = gpio_to_irq(pdata->gpio_charge);
317 
318                 if (jz_battery->charge_irq >= 0) {
319                         ret = request_irq(jz_battery->charge_irq,
320                                     jz_battery_charge_irq,
321                                     IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
322                                     dev_name(&pdev->dev), jz_battery);
323                         if (ret) {
324                                 dev_err(&pdev->dev, "Failed to request charge irq: %d\n", ret);
325                                 goto err_free_gpio;
326                         }
327                 }
328         } else {
329                 jz_battery->charge_irq = -1;
330         }
331 
332         if (jz_battery->pdata->info.voltage_max_design <= 2500000)
333                 jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB,
334                         JZ_ADC_CONFIG_BAT_MB);
335         else
336                 jz4740_adc_set_config(pdev->dev.parent, JZ_ADC_CONFIG_BAT_MB, 0);
337 
338         jz_battery->battery = power_supply_register(&pdev->dev, battery_desc,
339                                                         &psy_cfg);
340         if (IS_ERR(jz_battery->battery)) {
341                 dev_err(&pdev->dev, "power supply battery register failed.\n");
342                 ret = PTR_ERR(jz_battery->battery);
343                 goto err_free_charge_irq;
344         }
345 
346         platform_set_drvdata(pdev, jz_battery);
347         schedule_delayed_work(&jz_battery->work, 0);
348 
349         return 0;
350 
351 err_free_charge_irq:
352         if (jz_battery->charge_irq >= 0)
353                 free_irq(jz_battery->charge_irq, jz_battery);
354 err_free_gpio:
355         if (gpio_is_valid(pdata->gpio_charge))
356                 gpio_free(jz_battery->pdata->gpio_charge);
357 err_free_irq:
358         free_irq(jz_battery->irq, jz_battery);
359         return ret;
360 }
361 
362 static int jz_battery_remove(struct platform_device *pdev)
363 {
364         struct jz_battery *jz_battery = platform_get_drvdata(pdev);
365 
366         cancel_delayed_work_sync(&jz_battery->work);
367 
368         if (gpio_is_valid(jz_battery->pdata->gpio_charge)) {
369                 if (jz_battery->charge_irq >= 0)
370                         free_irq(jz_battery->charge_irq, jz_battery);
371                 gpio_free(jz_battery->pdata->gpio_charge);
372         }
373 
374         power_supply_unregister(jz_battery->battery);
375 
376         free_irq(jz_battery->irq, jz_battery);
377 
378         return 0;
379 }
380 
381 #ifdef CONFIG_PM
382 static int jz_battery_suspend(struct device *dev)
383 {
384         struct jz_battery *jz_battery = dev_get_drvdata(dev);
385 
386         cancel_delayed_work_sync(&jz_battery->work);
387         jz_battery->status = POWER_SUPPLY_STATUS_UNKNOWN;
388 
389         return 0;
390 }
391 
392 static int jz_battery_resume(struct device *dev)
393 {
394         struct jz_battery *jz_battery = dev_get_drvdata(dev);
395 
396         schedule_delayed_work(&jz_battery->work, 0);
397 
398         return 0;
399 }
400 
401 static const struct dev_pm_ops jz_battery_pm_ops = {
402         .suspend        = jz_battery_suspend,
403         .resume         = jz_battery_resume,
404 };
405 
406 #define JZ_BATTERY_PM_OPS (&jz_battery_pm_ops)
407 #else
408 #define JZ_BATTERY_PM_OPS NULL
409 #endif
410 
411 static struct platform_driver jz_battery_driver = {
412         .probe          = jz_battery_probe,
413         .remove         = jz_battery_remove,
414         .driver = {
415                 .name = "jz4740-battery",
416                 .pm = JZ_BATTERY_PM_OPS,
417         },
418 };
419 
420 module_platform_driver(jz_battery_driver);
421 
422 MODULE_ALIAS("platform:jz4740-battery");
423 MODULE_LICENSE("GPL");
424 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
425 MODULE_DESCRIPTION("JZ4740 SoC battery driver");
426 

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