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");