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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 = power_supply_get_drvdata(psy);
139 
140         if (psp == POWER_SUPPLY_PROP_ONLINE) {
141                 val->intval = charger->ac_online;
142                 charger->prev_ac_online = charger->ac_online;
143                 return 0;
144         }
145         return -EINVAL;
146 }
147 
148 static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
149 {
150         struct tps65090_charger *charger = dev_id;
151         int ret;
152         uint8_t status1 = 0;
153         uint8_t intrsts = 0;
154 
155         ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
156                             &status1);
157         if (ret < 0) {
158                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
159                                 __func__, TPS65090_REG_CG_STATUS1);
160                 return IRQ_HANDLED;
161         }
162         msleep(75);
163         ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
164                             &intrsts);
165         if (ret < 0) {
166                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
167                                 __func__, TPS65090_REG_INTR_STS);
168                 return IRQ_HANDLED;
169         }
170 
171         if (intrsts & TPS65090_VACG) {
172                 ret = tps65090_enable_charging(charger);
173                 if (ret < 0)
174                         return IRQ_HANDLED;
175                 charger->ac_online = 1;
176         } else {
177                 charger->ac_online = 0;
178         }
179 
180         /* Clear interrupts. */
181         if (!charger->passive_mode) {
182                 ret = tps65090_write(charger->dev->parent,
183                                      TPS65090_REG_INTR_STS, 0x00);
184                 if (ret < 0) {
185                         dev_err(charger->dev,
186                                 "%s(): Error in writing reg 0x%x\n",
187                                 __func__, TPS65090_REG_INTR_STS);
188                 }
189         }
190 
191         if (charger->prev_ac_online != charger->ac_online)
192                 power_supply_changed(charger->ac);
193 
194         return IRQ_HANDLED;
195 }
196 
197 static struct tps65090_platform_data *
198                 tps65090_parse_dt_charger_data(struct platform_device *pdev)
199 {
200         struct tps65090_platform_data *pdata;
201         struct device_node *np = pdev->dev.of_node;
202         unsigned int prop;
203 
204         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
205         if (!pdata) {
206                 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
207                 return NULL;
208         }
209 
210         prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
211         pdata->enable_low_current_chrg = prop;
212 
213         pdata->irq_base = -1;
214 
215         return pdata;
216 
217 }
218 
219 static int tps65090_charger_poll_task(void *data)
220 {
221         set_freezable();
222 
223         while (!kthread_should_stop()) {
224                 schedule_timeout_interruptible(POLL_INTERVAL);
225                 try_to_freeze();
226                 tps65090_charger_isr(-1, data);
227         }
228         return 0;
229 }
230 
231 static const struct power_supply_desc tps65090_charger_desc = {
232         .name                   = "tps65090-ac",
233         .type                   = POWER_SUPPLY_TYPE_MAINS,
234         .get_property           = tps65090_ac_get_property,
235         .properties             = tps65090_ac_props,
236         .num_properties         = ARRAY_SIZE(tps65090_ac_props),
237 };
238 
239 static int tps65090_charger_probe(struct platform_device *pdev)
240 {
241         struct tps65090_charger *cdata;
242         struct tps65090_platform_data *pdata;
243         struct power_supply_config psy_cfg = {};
244         uint8_t status1 = 0;
245         int ret;
246         int irq;
247 
248         pdata = dev_get_platdata(pdev->dev.parent);
249 
250         if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
251                 pdata = tps65090_parse_dt_charger_data(pdev);
252 
253         if (!pdata) {
254                 dev_err(&pdev->dev, "%s():no platform data available\n",
255                                 __func__);
256                 return -ENODEV;
257         }
258 
259         cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
260         if (!cdata) {
261                 dev_err(&pdev->dev, "failed to allocate memory status\n");
262                 return -ENOMEM;
263         }
264 
265         platform_set_drvdata(pdev, cdata);
266 
267         cdata->dev                      = &pdev->dev;
268         cdata->pdata                    = pdata;
269 
270         psy_cfg.supplied_to             = pdata->supplied_to;
271         psy_cfg.num_supplicants         = pdata->num_supplicants;
272         psy_cfg.of_node                 = pdev->dev.of_node;
273         psy_cfg.drv_data                = cdata;
274 
275         cdata->ac = power_supply_register(&pdev->dev, &tps65090_charger_desc,
276                         &psy_cfg);
277         if (IS_ERR(cdata->ac)) {
278                 dev_err(&pdev->dev, "failed: power supply register\n");
279                 return PTR_ERR(cdata->ac);
280         }
281 
282         irq = platform_get_irq(pdev, 0);
283         if (irq < 0)
284                 irq = -ENXIO;
285         cdata->irq = irq;
286 
287         ret = tps65090_config_charger(cdata);
288         if (ret < 0) {
289                 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
290                 goto fail_unregister_supply;
291         }
292 
293         /* Check for charger presence */
294         ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
295                         &status1);
296         if (ret < 0) {
297                 dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
298                         TPS65090_REG_CG_STATUS1);
299                 goto fail_unregister_supply;
300         }
301 
302         if (status1 != 0) {
303                 ret = tps65090_enable_charging(cdata);
304                 if (ret < 0) {
305                         dev_err(cdata->dev, "error enabling charger\n");
306                         goto fail_unregister_supply;
307                 }
308                 cdata->ac_online = 1;
309                 power_supply_changed(cdata->ac);
310         }
311 
312         if (irq != -ENXIO) {
313                 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
314                         tps65090_charger_isr, 0, "tps65090-charger", cdata);
315                 if (ret) {
316                         dev_err(cdata->dev,
317                                 "Unable to register irq %d err %d\n", irq,
318                                 ret);
319                         goto fail_unregister_supply;
320                 }
321         } else {
322                 cdata->poll_task = kthread_run(tps65090_charger_poll_task,
323                                               cdata, "ktps65090charger");
324                 cdata->passive_mode = true;
325                 if (IS_ERR(cdata->poll_task)) {
326                         ret = PTR_ERR(cdata->poll_task);
327                         dev_err(cdata->dev,
328                                 "Unable to run kthread err %d\n", ret);
329                         goto fail_unregister_supply;
330                 }
331         }
332 
333         return 0;
334 
335 fail_unregister_supply:
336         power_supply_unregister(cdata->ac);
337 
338         return ret;
339 }
340 
341 static int tps65090_charger_remove(struct platform_device *pdev)
342 {
343         struct tps65090_charger *cdata = platform_get_drvdata(pdev);
344 
345         if (cdata->irq == -ENXIO)
346                 kthread_stop(cdata->poll_task);
347         power_supply_unregister(cdata->ac);
348 
349         return 0;
350 }
351 
352 static const struct of_device_id of_tps65090_charger_match[] = {
353         { .compatible = "ti,tps65090-charger", },
354         { /* end */ }
355 };
356 
357 static struct platform_driver tps65090_charger_driver = {
358         .driver = {
359                 .name   = "tps65090-charger",
360                 .of_match_table = of_tps65090_charger_match,
361         },
362         .probe  = tps65090_charger_probe,
363         .remove = tps65090_charger_remove,
364 };
365 module_platform_driver(tps65090_charger_driver);
366 
367 MODULE_LICENSE("GPL v2");
368 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
369 MODULE_DESCRIPTION("tps65090 battery charger driver");
370 

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