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/init.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/of_device.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/power_supply.h>
  27 #include <linux/slab.h>
  28
  29 #include <linux/mfd/tps65090.h>
  30
  31 #define TPS65090_REG_INTR_STS   0x00
  32 #define TPS65090_REG_INTR_MASK  0x02
  33 #define TPS65090_REG_CG_CTRL0   0x04
  34 #define TPS65090_REG_CG_CTRL1   0x05
  35 #define TPS65090_REG_CG_CTRL2   0x06
  36 #define TPS65090_REG_CG_CTRL3   0x07
  37 #define TPS65090_REG_CG_CTRL4   0x08
  38 #define TPS65090_REG_CG_CTRL5   0x09
  39 #define TPS65090_REG_CG_STATUS1 0x0a
  40 #define TPS65090_REG_CG_STATUS2 0x0b
  41
  42 #define TPS65090_CHARGER_ENABLE BIT(0)
  43 #define TPS65090_VACG           BIT(1)
  44 #define TPS65090_NOITERM        BIT(5)
  45
  46 struct tps65090_charger {
  47         struct  device  *dev;
  48         int     ac_online;
  49         int     prev_ac_online;
  50         int     irq;
  51         struct power_supply     ac;
  52         struct tps65090_platform_data *pdata;
  53 };
  54
  55 static enum power_supply_property tps65090_ac_props[] = {
  56         POWER_SUPPLY_PROP_ONLINE,
  57 };
  58
  59 static int tps65090_low_chrg_current(struct tps65090_charger *charger)
  60 {
  61         int ret;
  62
  63         ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
  64                         TPS65090_NOITERM);
  65         if (ret < 0) {
  66                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
  67                         __func__, TPS65090_REG_CG_CTRL5);
  68                 return ret;
  69         }
  70         return 0;
  71 }
  72
  73 static int tps65090_enable_charging(struct tps65090_charger *charger)
  74 {
  75         int ret;
  76         uint8_t ctrl0 = 0;
  77
  78         ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
  79                             &ctrl0);
  80         if (ret < 0) {
  81                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
  82                                 __func__, TPS65090_REG_CG_CTRL0);
  83                 return ret;
  84         }
  85
  86         ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
  87                                 (ctrl0 | TPS65090_CHARGER_ENABLE));
  88         if (ret < 0) {
  89                 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
  90                                 __func__, TPS65090_REG_CG_CTRL0);
  91                 return ret;
  92         }
  93         return 0;
  94 }
  95
  96 static int tps65090_config_charger(struct tps65090_charger *charger)
  97 {
  98         uint8_t intrmask = 0;
  99         int ret;
 100
 101         if (charger->pdata->enable_low_current_chrg) {
 102                 ret = tps65090_low_chrg_current(charger);
 103                 if (ret < 0) {
 104                         dev_err(charger->dev,
 105                                 "error configuring low charge current\n");
 106                         return ret;
 107                 }
 108         }
 109
 110         /* Enable the VACG interrupt for AC power detect */
 111         ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
 112                             &intrmask);
 113         if (ret < 0) {
 114                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
 115                         __func__, TPS65090_REG_INTR_MASK);
 116                 return ret;
 117         }
 118
 119         ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
 120                              (intrmask | TPS65090_VACG));
 121         if (ret < 0) {
 122                 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
 123                         __func__, TPS65090_REG_CG_CTRL0);
 124                 return ret;
 125         }
 126
 127         return 0;
 128 }
 129
 130 static int tps65090_ac_get_property(struct power_supply *psy,
 131                         enum power_supply_property psp,
 132                         union power_supply_propval *val)
 133 {
 134         struct tps65090_charger *charger = container_of(psy,
 135                                         struct tps65090_charger, ac);
 136
 137         if (psp == POWER_SUPPLY_PROP_ONLINE) {
 138                 val->intval = charger->ac_online;
 139                 charger->prev_ac_online = charger->ac_online;
 140                 return 0;
 141         }
 142         return -EINVAL;
 143 }
 144
 145 static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
 146 {
 147         struct tps65090_charger *charger = dev_id;
 148         int ret;
 149         uint8_t status1 = 0;
 150         uint8_t intrsts = 0;
 151
 152         ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
 153                             &status1);
 154         if (ret < 0) {
 155                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 156                                 __func__, TPS65090_REG_CG_STATUS1);
 157                 return IRQ_HANDLED;
 158         }
 159         msleep(75);
 160         ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
 161                             &intrsts);
 162         if (ret < 0) {
 163                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 164                                 __func__, TPS65090_REG_INTR_STS);
 165                 return IRQ_HANDLED;
 166         }
 167
 168         if (intrsts & TPS65090_VACG) {
 169                 ret = tps65090_enable_charging(charger);
 170                 if (ret < 0)
 171                         return IRQ_HANDLED;
 172                 charger->ac_online = 1;
 173         } else {
 174                 charger->ac_online = 0;
 175         }
 176
 177         /* Clear interrupts. */
 178         ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_STS, 0x00);
 179         if (ret < 0) {
 180                 dev_err(charger->dev, "%s(): Error in writing reg 0x%x\n",
 181                                 __func__, TPS65090_REG_INTR_STS);
 182         }
 183
 184         if (charger->prev_ac_online != charger->ac_online)
 185                 power_supply_changed(&charger->ac);
 186
 187         return IRQ_HANDLED;
 188 }
 189
 190 static struct tps65090_platform_data *
 191                 tps65090_parse_dt_charger_data(struct platform_device *pdev)
 192 {
 193         struct tps65090_platform_data *pdata;
 194         struct device_node *np = pdev->dev.of_node;
 195         unsigned int prop;
 196
 197         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 198         if (!pdata) {
 199                 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
 200                 return NULL;
 201         }
 202
 203         prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
 204         pdata->enable_low_current_chrg = prop;
 205
 206         pdata->irq_base = -1;
 207
 208         return pdata;
 209
 210 }
 211
 212 static int tps65090_charger_probe(struct platform_device *pdev)
 213 {
 214         struct tps65090_charger *cdata;
 215         struct tps65090_platform_data *pdata;
 216         uint8_t status1 = 0;
 217         int ret;
 218         int irq;
 219
 220         pdata = dev_get_platdata(pdev->dev.parent);
 221
 222         if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
 223                 pdata = tps65090_parse_dt_charger_data(pdev);
 224
 225         if (!pdata) {
 226                 dev_err(&pdev->dev, "%s():no platform data available\n",
 227                                 __func__);
 228                 return -ENODEV;
 229         }
 230
 231         cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
 232         if (!cdata) {
 233                 dev_err(&pdev->dev, "failed to allocate memory status\n");
 234                 return -ENOMEM;
 235         }
 236
 237         platform_set_drvdata(pdev, cdata);
 238
 239         cdata->dev                      = &pdev->dev;
 240         cdata->pdata                    = pdata;
 241
 242         cdata->ac.name                  = "tps65090-ac";
 243         cdata->ac.type                  = POWER_SUPPLY_TYPE_MAINS;
 244         cdata->ac.get_property          = tps65090_ac_get_property;
 245         cdata->ac.properties            = tps65090_ac_props;
 246         cdata->ac.num_properties        = ARRAY_SIZE(tps65090_ac_props);
 247         cdata->ac.supplied_to           = pdata->supplied_to;
 248         cdata->ac.num_supplicants       = pdata->num_supplicants;
 249         cdata->ac.of_node               = pdev->dev.of_node;
 250
 251         ret = power_supply_register(&pdev->dev, &cdata->ac);
 252         if (ret) {
 253                 dev_err(&pdev->dev, "failed: power supply register\n");
 254                 return ret;
 255         }
 256
 257         irq = platform_get_irq(pdev, 0);
 258         if (irq <= 0) {
 259                 dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
 260                 ret = irq;
 261                 goto fail_unregister_supply;
 262         }
 263
 264         cdata->irq = irq;
 265
 266         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 267                 tps65090_charger_isr, 0, "tps65090-charger", cdata);
 268         if (ret) {
 269                 dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
 270                         ret);
 271                 goto fail_unregister_supply;
 272         }
 273
 274         ret = tps65090_config_charger(cdata);
 275         if (ret < 0) {
 276                 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
 277                 goto fail_unregister_supply;
 278         }
 279
 280         /* Check for charger presence */
 281         ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
 282                         &status1);
 283         if (ret < 0) {
 284                 dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
 285                         TPS65090_REG_CG_STATUS1);
 286                 goto fail_unregister_supply;
 287         }
 288
 289         if (status1 != 0) {
 290                 ret = tps65090_enable_charging(cdata);
 291                 if (ret < 0) {
 292                         dev_err(cdata->dev, "error enabling charger\n");
 293                         goto fail_unregister_supply;
 294                 }
 295                 cdata->ac_online = 1;
 296                 power_supply_changed(&cdata->ac);
 297         }
 298
 299         return 0;
 300
 301 fail_unregister_supply:
 302         power_supply_unregister(&cdata->ac);
 303
 304         return ret;
 305 }
 306
 307 static int tps65090_charger_remove(struct platform_device *pdev)
 308 {
 309         struct tps65090_charger *cdata = platform_get_drvdata(pdev);
 310
 311         power_supply_unregister(&cdata->ac);
 312
 313         return 0;
 314 }
 315
 316 static struct of_device_id of_tps65090_charger_match[] = {
 317         { .compatible = "ti,tps65090-charger", },
 318         { /* end */ }
 319 };
 320
 321 static struct platform_driver tps65090_charger_driver = {
 322         .driver = {
 323                 .name   = "tps65090-charger",
 324                 .of_match_table = of_tps65090_charger_match,
 325                 .owner  = THIS_MODULE,
 326         },
 327         .probe  = tps65090_charger_probe,
 328         .remove = tps65090_charger_remove,
 329 };
 330 module_platform_driver(tps65090_charger_driver);
 331
 332 MODULE_LICENSE("GPL v2");
 333 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
 334 MODULE_DESCRIPTION("tps65090 battery charger driver");