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 MODULE_DEVICE_TABLE(of, of_tps65090_charger_match); 357 358 static struct platform_driver tps65090_charger_driver = { 359 .driver = { 360 .name = "tps65090-charger", 361 .of_match_table = of_tps65090_charger_match, 362 }, 363 .probe = tps65090_charger_probe, 364 .remove = tps65090_charger_remove, 365 }; 366 module_platform_driver(tps65090_charger_driver); 367 368 MODULE_LICENSE("GPL v2"); 369 MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>"); 370 MODULE_DESCRIPTION("tps65090 battery charger driver"); 371