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");