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_CG_CTRL0   0x04
  31 #define TPS65090_REG_CG_CTRL1   0x05
  32 #define TPS65090_REG_CG_CTRL2   0x06
  33 #define TPS65090_REG_CG_CTRL3   0x07
  34 #define TPS65090_REG_CG_CTRL4   0x08
  35 #define TPS65090_REG_CG_CTRL5   0x09
  36 #define TPS65090_REG_CG_STATUS1 0x0a
  37 #define TPS65090_REG_CG_STATUS2 0x0b
  38
  39 #define TPS65090_CHARGER_ENABLE BIT(0)
  40 #define TPS65090_VACG           BIT(1)
  41 #define TPS65090_NOITERM        BIT(5)
  42
  43 struct tps65090_charger {
  44         struct  device  *dev;
  45         int     ac_online;
  46         int     prev_ac_online;
  47         int     irq;
  48         struct power_supply     ac;
  49         struct tps65090_platform_data *pdata;
  50 };
  51
  52 static enum power_supply_property tps65090_ac_props[] = {
  53         POWER_SUPPLY_PROP_ONLINE,
  54 };
  55
  56 static int tps65090_low_chrg_current(struct tps65090_charger *charger)
  57 {
  58         int ret;
  59
  60         ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
  61                         TPS65090_NOITERM);
  62         if (ret < 0) {
  63                 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
  64                         __func__, TPS65090_REG_CG_CTRL5);
  65                 return ret;
  66         }
  67         return 0;
  68 }
  69
  70 static int tps65090_enable_charging(struct tps65090_charger *charger,
  71         uint8_t enable)
  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 reading 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         int ret;
  97
  98         if (charger->pdata->enable_low_current_chrg) {
  99                 ret = tps65090_low_chrg_current(charger);
 100                 if (ret < 0) {
 101                         dev_err(charger->dev,
 102                                 "error configuring low charge current\n");
 103                         return ret;
 104                 }
 105         }
 106
 107         return 0;
 108 }
 109
 110 static int tps65090_ac_get_property(struct power_supply *psy,
 111                         enum power_supply_property psp,
 112                         union power_supply_propval *val)
 113 {
 114         struct tps65090_charger *charger = container_of(psy,
 115                                         struct tps65090_charger, ac);
 116
 117         if (psp == POWER_SUPPLY_PROP_ONLINE) {
 118                 val->intval = charger->ac_online;
 119                 charger->prev_ac_online = charger->ac_online;
 120                 return 0;
 121         }
 122         return -EINVAL;
 123 }
 124
 125 static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
 126 {
 127         struct tps65090_charger *charger = dev_id;
 128         int ret;
 129         uint8_t status1 = 0;
 130         uint8_t intrsts = 0;
 131
 132         ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
 133                             &status1);
 134         if (ret < 0) {
 135                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 136                                 __func__, TPS65090_REG_CG_STATUS1);
 137                 return IRQ_HANDLED;
 138         }
 139         msleep(75);
 140         ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
 141                             &intrsts);
 142         if (ret < 0) {
 143                 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
 144                                 __func__, TPS65090_REG_INTR_STS);
 145                 return IRQ_HANDLED;
 146         }
 147
 148         if (intrsts & TPS65090_VACG) {
 149                 ret = tps65090_enable_charging(charger, 1);
 150                 if (ret < 0)
 151                         return IRQ_HANDLED;
 152                 charger->ac_online = 1;
 153         } else {
 154                 charger->ac_online = 0;
 155         }
 156
 157         if (charger->prev_ac_online != charger->ac_online)
 158                 power_supply_changed(&charger->ac);
 159
 160         return IRQ_HANDLED;
 161 }
 162
 163 #if defined(CONFIG_OF)
 164
 165 #include <linux/of_device.h>
 166
 167 static struct tps65090_platform_data *
 168                 tps65090_parse_dt_charger_data(struct platform_device *pdev)
 169 {
 170         struct tps65090_platform_data *pdata;
 171         struct device_node *np = pdev->dev.parent->of_node;
 172         unsigned int prop;
 173
 174         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
 175         if (!pdata) {
 176                 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
 177                 return NULL;
 178         }
 179
 180         prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
 181         pdata->enable_low_current_chrg = prop;
 182
 183         pdata->irq_base = -1;
 184
 185         return pdata;
 186
 187 }
 188 #else
 189 static struct tps65090_platform_data *
 190                 tps65090_parse_dt_charger_data(struct platform_device *pdev)
 191 {
 192         return NULL;
 193 }
 194 #endif
 195
 196 static int tps65090_charger_probe(struct platform_device *pdev)
 197 {
 198         struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
 199         struct tps65090_charger *cdata;
 200         struct tps65090_platform_data *pdata;
 201         uint8_t status1 = 0;
 202         int ret;
 203         int irq;
 204
 205         pdata = dev_get_platdata(pdev->dev.parent);
 206
 207         if (!pdata && tps65090_mfd->dev->of_node)
 208                 pdata = tps65090_parse_dt_charger_data(pdev);
 209
 210         if (!pdata) {
 211                 dev_err(&pdev->dev, "%s():no platform data available\n",
 212                                 __func__);
 213                 return -ENODEV;
 214         }
 215
 216         cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
 217         if (!cdata) {
 218                 dev_err(&pdev->dev, "failed to allocate memory status\n");
 219                 return -ENOMEM;
 220         }
 221
 222         dev_set_drvdata(&pdev->dev, cdata);
 223
 224         cdata->dev                      = &pdev->dev;
 225         cdata->pdata                    = pdata;
 226
 227         cdata->ac.name                  = "tps65090-ac";
 228         cdata->ac.type                  = POWER_SUPPLY_TYPE_MAINS;
 229         cdata->ac.get_property          = tps65090_ac_get_property;
 230         cdata->ac.properties            = tps65090_ac_props;
 231         cdata->ac.num_properties        = ARRAY_SIZE(tps65090_ac_props);
 232         cdata->ac.supplied_to           = pdata->supplied_to;
 233         cdata->ac.num_supplicants       = pdata->num_supplicants;
 234
 235         ret = power_supply_register(&pdev->dev, &cdata->ac);
 236         if (ret) {
 237                 dev_err(&pdev->dev, "failed: power supply register\n");
 238                 return ret;
 239         }
 240
 241         irq = platform_get_irq(pdev, 0);
 242         if (irq <= 0) {
 243                 dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
 244                 ret = irq;
 245                 goto fail_unregister_supply;
 246         }
 247
 248         cdata->irq = irq;
 249
 250         ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 251                 tps65090_charger_isr, 0, "tps65090-charger", cdata);
 252         if (ret) {
 253                 dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
 254                         ret);
 255                 goto fail_free_irq;
 256         }
 257
 258         ret = tps65090_config_charger(cdata);
 259         if (ret < 0) {
 260                 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
 261                 goto fail_free_irq;
 262         }
 263
 264         /* Check for charger presence */
 265         ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
 266                         &status1);
 267         if (ret < 0) {
 268                 dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
 269                         TPS65090_REG_CG_STATUS1);
 270                 goto fail_free_irq;
 271         }
 272
 273         if (status1 != 0) {
 274                 ret = tps65090_enable_charging(cdata, 1);
 275                 if (ret < 0) {
 276                         dev_err(cdata->dev, "error enabling charger\n");
 277                         goto fail_free_irq;
 278                 }
 279                 cdata->ac_online = 1;
 280                 power_supply_changed(&cdata->ac);
 281         }
 282
 283         return 0;
 284
 285 fail_free_irq:
 286         devm_free_irq(cdata->dev, irq, cdata);
 287 fail_unregister_supply:
 288         power_supply_unregister(&cdata->ac);
 289
 290         return ret;
 291 }
 292
 293 static int tps65090_charger_remove(struct platform_device *pdev)
 294 {
 295         struct tps65090_charger *cdata = dev_get_drvdata(&pdev->dev);
 296
 297         devm_free_irq(cdata->dev, cdata->irq, cdata);
 298         power_supply_unregister(&cdata->ac);
 299
 300         return 0;
 301 }
 302
 303 static struct platform_driver tps65090_charger_driver = {
 304         .driver = {
 305                 .name   = "tps65090-charger",
 306                 .owner  = THIS_MODULE,
 307         },
 308         .probe  = tps65090_charger_probe,
 309         .remove = tps65090_charger_remove,
 310 };
 311 module_platform_driver(tps65090_charger_driver);
 312
 313 MODULE_LICENSE("GPL v2");
 314 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
 315 MODULE_DESCRIPTION("tps65090 battery charger driver");