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Linux/drivers/power/tps65090-charger.c

  1 /*
  2  * Battery charger driver for TI's tps65090
  3  *
  4  * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.
  5 
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms and conditions of the GNU General Public License,
  8  * version 2, as published by the Free Software Foundation.
  9 
 10  * This program is distributed in the hope it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13  * more details.
 14 
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 17  */
 18 #include <linux/delay.h>
 19 #include <linux/err.h>
 20 #include <linux/freezer.h>
 21 #include <linux/init.h>
 22 #include <linux/interrupt.h>
 23 #include <linux/kernel.h>
 24 #include <linux/kthread.h>
 25 #include <linux/module.h>
 26 #include <linux/of_device.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/power_supply.h>
 29 #include <linux/slab.h>
 30 
 31 #include <linux/mfd/tps65090.h>
 32 
 33 #define TPS65090_CHARGER_ENABLE BIT(0)
 34 #define TPS65090_VACG           BIT(1)
 35 #define TPS65090_NOITERM        BIT(5)
 36 
 37 #define POLL_INTERVAL           (HZ * 2)        /* Used when no irq */
 38 
 39 struct tps65090_charger {
 40         struct  device  *dev;
 41         int     ac_online;
 42         int     prev_ac_online;
 43         int     irq;
 44         struct task_struct      *poll_task;
 45         bool                    passive_mode;
 46         struct power_supply     ac;
 47         struct tps65090_platform_data *pdata;
 48 };
 49 
 50 static enum power_supply_property tps65090_ac_props[] = {
 51         POWER_SUPPLY_PROP_ONLINE,
 52 };
 53 
 54 static int tps65090_low_chrg_current(struct tps65090_charger *charger)
 55 {
 56         int ret;
 57 
 58         if (charger->passive_mode)
 59                 return 0;
 60 
 61         ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
 62                         TPS65090_NOITERM);
 63         if (ret < 0) {
 64                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 65                         __func__, TPS65090_REG_CG_CTRL5);
 66                 return ret;
 67         }
 68         return 0;
 69 }
 70 
 71 static int tps65090_enable_charging(struct tps65090_charger *charger)
 72 {
 73         int ret;
 74         uint8_t ctrl0 = 0;
 75 
 76         if (charger->passive_mode)
 77                 return 0;
 78 
 79         ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
 80                             &ctrl0);
 81         if (ret < 0) {
 82                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 83                                 __func__, TPS65090_REG_CG_CTRL0);
 84                 return ret;
 85         }
 86 
 87         ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
 88                                 (ctrl0 | TPS65090_CHARGER_ENABLE));
 89         if (ret < 0) {
 90                 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
 91                                 __func__, TPS65090_REG_CG_CTRL0);
 92                 return ret;
 93         }
 94         return 0;
 95 }
 96 
 97 static int tps65090_config_charger(struct tps65090_charger *charger)
 98 {
 99         uint8_t intrmask = 0;
100         int ret;
101 
102         if (charger->passive_mode)
103                 return 0;
104 
105         if (charger->pdata->enable_low_current_chrg) {
106                 ret = tps65090_low_chrg_current(charger);
107                 if (ret < 0) {
108                         dev_err(charger->dev,
109                                 "error configuring low charge current\n");
110                         return ret;
111                 }
112         }
113 
114         /* Enable the VACG interrupt for AC power detect */
115         ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
116                             &intrmask);
117         if (ret < 0) {
118                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
119                         __func__, TPS65090_REG_INTR_MASK);
120                 return ret;
121         }
122 
123         ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
124                              (intrmask | TPS65090_VACG));
125         if (ret < 0) {
126                 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
127                         __func__, TPS65090_REG_CG_CTRL0);
128                 return ret;
129         }
130 
131         return 0;
132 }
133 
134 static int tps65090_ac_get_property(struct power_supply *psy,
135                         enum power_supply_property psp,
136                         union power_supply_propval *val)
137 {
138         struct tps65090_charger *charger = container_of(psy,
139                                         struct tps65090_charger, ac);
140 
141         if (psp == POWER_SUPPLY_PROP_ONLINE) {
142                 val->intval = charger->ac_online;
143                 charger->prev_ac_online = charger->ac_online;
144                 return 0;
145         }
146         return -EINVAL;
147 }
148 
149 static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
150 {
151         struct tps65090_charger *charger = dev_id;
152         int ret;
153         uint8_t status1 = 0;
154         uint8_t intrsts = 0;
155 
156         ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
157                             &status1);
158         if (ret < 0) {
159                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
160                                 __func__, TPS65090_REG_CG_STATUS1);
161                 return IRQ_HANDLED;
162         }
163         msleep(75);
164         ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
165                             &intrsts);
166         if (ret < 0) {
167                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
168                                 __func__, TPS65090_REG_INTR_STS);
169                 return IRQ_HANDLED;
170         }
171 
172         if (intrsts & TPS65090_VACG) {
173                 ret = tps65090_enable_charging(charger);
174                 if (ret < 0)
175                         return IRQ_HANDLED;
176                 charger->ac_online = 1;
177         } else {
178                 charger->ac_online = 0;
179         }
180 
181         /* Clear interrupts. */
182         if (!charger->passive_mode) {
183                 ret = tps65090_write(charger->dev->parent,
184                                      TPS65090_REG_INTR_STS, 0x00);
185                 if (ret < 0) {
186                         dev_err(charger->dev,
187                                 "%s(): Error in writing reg 0x%x\n",
188                                 __func__, TPS65090_REG_INTR_STS);
189                 }
190         }
191 
192         if (charger->prev_ac_online != charger->ac_online)
193                 power_supply_changed(&charger->ac);
194 
195         return IRQ_HANDLED;
196 }
197 
198 static struct tps65090_platform_data *
199                 tps65090_parse_dt_charger_data(struct platform_device *pdev)
200 {
201         struct tps65090_platform_data *pdata;
202         struct device_node *np = pdev->dev.of_node;
203         unsigned int prop;
204 
205         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
206         if (!pdata) {
207                 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
208                 return NULL;
209         }
210 
211         prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
212         pdata->enable_low_current_chrg = prop;
213 
214         pdata->irq_base = -1;
215 
216         return pdata;
217 
218 }
219 
220 static int tps65090_charger_poll_task(void *data)
221 {
222         set_freezable();
223 
224         while (!kthread_should_stop()) {
225                 schedule_timeout_interruptible(POLL_INTERVAL);
226                 try_to_freeze();
227                 tps65090_charger_isr(-1, data);
228         }
229         return 0;
230 }
231 
232 static int tps65090_charger_probe(struct platform_device *pdev)
233 {
234         struct tps65090_charger *cdata;
235         struct tps65090_platform_data *pdata;
236         uint8_t status1 = 0;
237         int ret;
238         int irq;
239 
240         pdata = dev_get_platdata(pdev->dev.parent);
241 
242         if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
243                 pdata = tps65090_parse_dt_charger_data(pdev);
244 
245         if (!pdata) {
246                 dev_err(&pdev->dev, "%s():no platform data available\n",
247                                 __func__);
248                 return -ENODEV;
249         }
250 
251         cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
252         if (!cdata) {
253                 dev_err(&pdev->dev, "failed to allocate memory status\n");
254                 return -ENOMEM;
255         }
256 
257         platform_set_drvdata(pdev, cdata);
258 
259         cdata->dev                      = &pdev->dev;
260         cdata->pdata                    = pdata;
261 
262         cdata->ac.name                  = "tps65090-ac";
263         cdata->ac.type                  = POWER_SUPPLY_TYPE_MAINS;
264         cdata->ac.get_property          = tps65090_ac_get_property;
265         cdata->ac.properties            = tps65090_ac_props;
266         cdata->ac.num_properties        = ARRAY_SIZE(tps65090_ac_props);
267         cdata->ac.supplied_to           = pdata->supplied_to;
268         cdata->ac.num_supplicants       = pdata->num_supplicants;
269         cdata->ac.of_node               = pdev->dev.of_node;
270 
271         ret = power_supply_register(&pdev->dev, &cdata->ac);
272         if (ret) {
273                 dev_err(&pdev->dev, "failed: power supply register\n");
274                 return ret;
275         }
276 
277         irq = platform_get_irq(pdev, 0);
278         if (irq < 0)
279                 irq = -ENXIO;
280         cdata->irq = irq;
281 
282         ret = tps65090_config_charger(cdata);
283         if (ret < 0) {
284                 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
285                 goto fail_unregister_supply;
286         }
287 
288         /* Check for charger presence */
289         ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
290                         &status1);
291         if (ret < 0) {
292                 dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
293                         TPS65090_REG_CG_STATUS1);
294                 goto fail_unregister_supply;
295         }
296 
297         if (status1 != 0) {
298                 ret = tps65090_enable_charging(cdata);
299                 if (ret < 0) {
300                         dev_err(cdata->dev, "error enabling charger\n");
301                         goto fail_unregister_supply;
302                 }
303                 cdata->ac_online = 1;
304                 power_supply_changed(&cdata->ac);
305         }
306 
307         if (irq != -ENXIO) {
308                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
309                         tps65090_charger_isr, 0, "tps65090-charger", cdata);
310                 if (ret) {
311                         dev_err(cdata->dev,
312                                 "Unable to register irq %d err %d\n", irq,
313                                 ret);
314                         goto fail_unregister_supply;
315                 }
316         } else {
317                 cdata->poll_task = kthread_run(tps65090_charger_poll_task,
318                                               cdata, "ktps65090charger");
319                 cdata->passive_mode = true;
320                 if (IS_ERR(cdata->poll_task)) {
321                         ret = PTR_ERR(cdata->poll_task);
322                         dev_err(cdata->dev,
323                                 "Unable to run kthread err %d\n", ret);
324                         goto fail_unregister_supply;
325                 }
326         }
327 
328         return 0;
329 
330 fail_unregister_supply:
331         power_supply_unregister(&cdata->ac);
332 
333         return ret;
334 }
335 
336 static int tps65090_charger_remove(struct platform_device *pdev)
337 {
338         struct tps65090_charger *cdata = platform_get_drvdata(pdev);
339 
340         if (cdata->irq == -ENXIO)
341                 kthread_stop(cdata->poll_task);
342         power_supply_unregister(&cdata->ac);
343 
344         return 0;
345 }
346 
347 static struct of_device_id of_tps65090_charger_match[] = {
348         { .compatible = "ti,tps65090-charger", },
349         { /* end */ }
350 };
351 
352 static struct platform_driver tps65090_charger_driver = {
353         .driver = {
354                 .name   = "tps65090-charger",
355                 .of_match_table = of_tps65090_charger_match,
356                 .owner  = THIS_MODULE,
357         },
358         .probe  = tps65090_charger_probe,
359         .remove = tps65090_charger_remove,
360 };
361 module_platform_driver(tps65090_charger_driver);
362 
363 MODULE_LICENSE("GPL v2");
364 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
365 MODULE_DESCRIPTION("tps65090 battery charger driver");
366 

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