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/err.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24 #include <linux/delay.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/power_supply.h>
  27 #include <linux/mfd/tps65090.h>
  28
  29 #define TPS65090_REG_INTR_STS   0x00
  30 #define TPS65090_REG_INTR_MASK  0x02
  31 #define TPS65090_REG_CG_CTRL0   0x04
  32 #define TPS65090_REG_CG_CTRL1   0x05
  33 #define TPS65090_REG_CG_CTRL2   0x06
  34 #define TPS65090_REG_CG_CTRL3   0x07
  35 #define TPS65090_REG_CG_CTRL4   0x08
  36 #define TPS65090_REG_CG_CTRL5   0x09
  37 #define TPS65090_REG_CG_STATUS1 0x0a
  38 #define TPS65090_REG_CG_STATUS2 0x0b
  39
  40 #define TPS65090_CHARGER_ENABLE BIT(0)
  41 #define TPS65090_VACG           BIT(1)
  42 #define TPS65090_NOITERM        BIT(5)
  43
  44 struct tps65090_charger {
  45         struct  device  *dev;
  46         int     ac_online;
  47         int     prev_ac_online;
  48         int     irq;
  49         struct power_supply     ac;
  50         struct tps65090_platform_data *pdata;
  51 };
  52
  53 static enum power_supply_property tps65090_ac_props[] = {
  54         POWER_SUPPLY_PROP_ONLINE,
  55 };
  56
  57 static int tps65090_low_chrg_current(struct tps65090_charger *charger)
  58 {
  59         int ret;
  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         ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
  77                             &ctrl0);
  78         if (ret < 0) {
  79                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
  80                                 __func__, TPS65090_REG_CG_CTRL0);
  81                 return ret;
  82         }
  83
  84         ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
  85                                 (ctrl0 | TPS65090_CHARGER_ENABLE));
  86         if (ret < 0) {
  87                 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
  88                                 __func__, TPS65090_REG_CG_CTRL0);
  89                 return ret;
  90         }
  91         return 0;
  92 }
  93
  94 static int tps65090_config_charger(struct tps65090_charger *charger)
  95 {
  96         uint8_t intrmask = 0;
  97         int ret;
  98
  99         if (charger->pdata->enable_low_current_chrg) {
 100                 ret = tps65090_low_chrg_current(charger);
 101                 if (ret < 0) {
 102                         dev_err(charger->dev,
 103                                 "error configuring low charge current\n");
 104                         return ret;
 105                 }
 106         }
 107
 108         /* Enable the VACG interrupt for AC power detect */
 109         ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
 110                             &intrmask);
 111         if (ret < 0) {
 112                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 113                         __func__, TPS65090_REG_INTR_MASK);
 114                 return ret;
 115         }
 116
 117         ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
 118                              (intrmask | TPS65090_VACG));
 119         if (ret < 0) {
 120                 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
 121                         __func__, TPS65090_REG_CG_CTRL0);
 122                 return ret;
 123         }
 124
 125         return 0;
 126 }
 127
 128 static int tps65090_ac_get_property(struct power_supply *psy,
 129                         enum power_supply_property psp,
 130                         union power_supply_propval *val)
 131 {
 132         struct tps65090_charger *charger = container_of(psy,
 133                                         struct tps65090_charger, ac);
 134
 135         if (psp == POWER_SUPPLY_PROP_ONLINE) {
 136                 val->intval = charger->ac_online;
 137                 charger->prev_ac_online = charger->ac_online;
 138                 return 0;
 139         }
 140         return -EINVAL;
 141 }
 142
 143 static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
 144 {
 145         struct tps65090_charger *charger = dev_id;
 146         int ret;
 147         uint8_t status1 = 0;
 148         uint8_t intrsts = 0;
 149
 150         ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
 151                             &status1);
 152         if (ret < 0) {
 153                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 154                                 __func__, TPS65090_REG_CG_STATUS1);
 155                 return IRQ_HANDLED;
 156         }
 157         msleep(75);
 158         ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
 159                             &intrsts);
 160         if (ret < 0) {
 161                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 162                                 __func__, TPS65090_REG_INTR_STS);
 163                 return IRQ_HANDLED;
 164         }
 165
 166         if (intrsts & TPS65090_VACG) {
 167                 ret = tps65090_enable_charging(charger);
 168                 if (ret < 0)
 169                         return IRQ_HANDLED;
 170                 charger->ac_online = 1;
 171         } else {
 172                 charger->ac_online = 0;
 173         }
 174
 175         /* Clear interrupts. */
 176         ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_STS, 0x00);
 177         if (ret < 0) {
 178                 dev_err(charger->dev, "%s(): Error in writing reg 0x%x\n",
 179                                 __func__, TPS65090_REG_INTR_STS);
 180         }
 181
 182         if (charger->prev_ac_online != charger->ac_online)
 183                 power_supply_changed(&charger->ac);
 184
 185         return IRQ_HANDLED;
 186 }
 187
 188 #if defined(CONFIG_OF)
 189
 190 #include <linux/of_device.h>
 191
 192 static struct tps65090_platform_data *
 193                 tps65090_parse_dt_charger_data(struct platform_device *pdev)
 194 {
 195         struct tps65090_platform_data *pdata;
 196         struct device_node *np = pdev->dev.of_node;
 197         unsigned int prop;
 198
 199         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 200         if (!pdata) {
 201                 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
 202                 return NULL;
 203         }
 204
 205         prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
 206         pdata->enable_low_current_chrg = prop;
 207
 208         pdata->irq_base = -1;
 209
 210         return pdata;
 211
 212 }
 213 #else
 214 static struct tps65090_platform_data *
 215                 tps65090_parse_dt_charger_data(struct platform_device *pdev)
 216 {
 217         return NULL;
 218 }
 219 #endif
 220
 221 static int tps65090_charger_probe(struct platform_device *pdev)
 222 {
 223         struct tps65090_charger *cdata;
 224         struct tps65090_platform_data *pdata;
 225         uint8_t status1 = 0;
 226         int ret;
 227         int irq;
 228
 229         pdata = dev_get_platdata(pdev->dev.parent);
 230
 231         if (!pdata && pdev->dev.of_node)
 232                 pdata = tps65090_parse_dt_charger_data(pdev);
 233
 234         if (!pdata) {
 235                 dev_err(&pdev->dev, "%s():no platform data available\n",
 236                                 __func__);
 237                 return -ENODEV;
 238         }
 239
 240         cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
 241         if (!cdata) {
 242                 dev_err(&pdev->dev, "failed to allocate memory status\n");
 243                 return -ENOMEM;
 244         }
 245
 246         platform_set_drvdata(pdev, cdata);
 247
 248         cdata->dev                      = &pdev->dev;
 249         cdata->pdata                    = pdata;
 250
 251         cdata->ac.name                  = "tps65090-ac";
 252         cdata->ac.type                  = POWER_SUPPLY_TYPE_MAINS;
 253         cdata->ac.get_property          = tps65090_ac_get_property;
 254         cdata->ac.properties            = tps65090_ac_props;
 255         cdata->ac.num_properties        = ARRAY_SIZE(tps65090_ac_props);
 256         cdata->ac.supplied_to           = pdata->supplied_to;
 257         cdata->ac.num_supplicants       = pdata->num_supplicants;
 258         cdata->ac.of_node               = pdev->dev.of_node;
 259
 260         ret = power_supply_register(&pdev->dev, &cdata->ac);
 261         if (ret) {
 262                 dev_err(&pdev->dev, "failed: power supply register\n");
 263                 return ret;
 264         }
 265
 266         irq = platform_get_irq(pdev, 0);
 267         if (irq <= 0) {
 268                 dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
 269                 ret = irq;
 270                 goto fail_unregister_supply;
 271         }
 272
 273         cdata->irq = irq;
 274
 275         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 276                 tps65090_charger_isr, 0, "tps65090-charger", cdata);
 277         if (ret) {
 278                 dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
 279                         ret);
 280                 goto fail_free_irq;
 281         }
 282
 283         ret = tps65090_config_charger(cdata);
 284         if (ret < 0) {
 285                 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
 286                 goto fail_free_irq;
 287         }
 288
 289         /* Check for charger presence */
 290         ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
 291                         &status1);
 292         if (ret < 0) {
 293                 dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
 294                         TPS65090_REG_CG_STATUS1);
 295                 goto fail_free_irq;
 296         }
 297
 298         if (status1 != 0) {
 299                 ret = tps65090_enable_charging(cdata);
 300                 if (ret < 0) {
 301                         dev_err(cdata->dev, "error enabling charger\n");
 302                         goto fail_free_irq;
 303                 }
 304                 cdata->ac_online = 1;
 305                 power_supply_changed(&cdata->ac);
 306         }
 307
 308         return 0;
 309
 310 fail_free_irq:
 311         devm_free_irq(cdata->dev, irq, cdata);
 312 fail_unregister_supply:
 313         power_supply_unregister(&cdata->ac);
 314
 315         return ret;
 316 }
 317
 318 static int tps65090_charger_remove(struct platform_device *pdev)
 319 {
 320         struct tps65090_charger *cdata = platform_get_drvdata(pdev);
 321
 322         devm_free_irq(cdata->dev, cdata->irq, cdata);
 323         power_supply_unregister(&cdata->ac);
 324
 325         return 0;
 326 }
 327
 328 static struct of_device_id of_tps65090_charger_match[] = {
 329         { .compatible = "ti,tps65090-charger", },
 330         { /* end */ }
 331 };
 332
 333 static struct platform_driver tps65090_charger_driver = {
 334         .driver = {
 335                 .name   = "tps65090-charger",
 336                 .of_match_table = of_tps65090_charger_match,
 337                 .owner  = THIS_MODULE,
 338         },
 339         .probe  = tps65090_charger_probe,
 340         .remove = tps65090_charger_remove,
 341 };
 342 module_platform_driver(tps65090_charger_driver);
 343
 344 MODULE_LICENSE("GPL v2");
 345 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
 346 MODULE_DESCRIPTION("tps65090 battery charger driver");