blob: 1b4b5e09538e15cad0b5921b234929457e1f664a [file] [log] [blame]
Rhyland Klein6f8da5d2013-03-12 18:08:09 -04001/*
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 */
Manish Badarkhee47bcba2013-09-28 10:02:24 +053018#include <linux/delay.h>
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040019#include <linux/err.h>
Doug Anderson193dcce2014-06-20 14:42:03 -070020#include <linux/freezer.h>
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040021#include <linux/init.h>
22#include <linux/interrupt.h>
23#include <linux/kernel.h>
Doug Anderson193dcce2014-06-20 14:42:03 -070024#include <linux/kthread.h>
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040025#include <linux/module.h>
Manish Badarkhee47bcba2013-09-28 10:02:24 +053026#include <linux/of_device.h>
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040027#include <linux/platform_device.h>
28#include <linux/power_supply.h>
Manish Badarkhee47bcba2013-09-28 10:02:24 +053029#include <linux/slab.h>
30
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040031#include <linux/mfd/tps65090.h>
32
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040033#define TPS65090_CHARGER_ENABLE BIT(0)
34#define TPS65090_VACG BIT(1)
35#define TPS65090_NOITERM BIT(5)
36
Doug Anderson193dcce2014-06-20 14:42:03 -070037#define POLL_INTERVAL (HZ * 2) /* Used when no irq */
38
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040039struct tps65090_charger {
40 struct device *dev;
41 int ac_online;
42 int prev_ac_online;
43 int irq;
Doug Anderson193dcce2014-06-20 14:42:03 -070044 struct task_struct *poll_task;
45 bool passive_mode;
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +010046 struct power_supply *ac;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040047 struct tps65090_platform_data *pdata;
48};
49
50static enum power_supply_property tps65090_ac_props[] = {
51 POWER_SUPPLY_PROP_ONLINE,
52};
53
54static int tps65090_low_chrg_current(struct tps65090_charger *charger)
55{
56 int ret;
57
Doug Anderson193dcce2014-06-20 14:42:03 -070058 if (charger->passive_mode)
59 return 0;
60
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040061 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
Andrew Chewe2414212013-06-06 14:12:43 -070071static int tps65090_enable_charging(struct tps65090_charger *charger)
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040072{
73 int ret;
74 uint8_t ctrl0 = 0;
75
Doug Anderson193dcce2014-06-20 14:42:03 -070076 if (charger->passive_mode)
77 return 0;
78
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040079 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) {
Andrew Chewe2414212013-06-06 14:12:43 -070090 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040091 __func__, TPS65090_REG_CG_CTRL0);
92 return ret;
93 }
94 return 0;
95}
96
97static int tps65090_config_charger(struct tps65090_charger *charger)
98{
Andrew Chewe2414212013-06-06 14:12:43 -070099 uint8_t intrmask = 0;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400100 int ret;
101
Doug Anderson193dcce2014-06-20 14:42:03 -0700102 if (charger->passive_mode)
103 return 0;
104
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400105 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
Andrew Chewe2414212013-06-06 14:12:43 -0700114 /* 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
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400131 return 0;
132}
133
134static int tps65090_ac_get_property(struct power_supply *psy,
135 enum power_supply_property psp,
136 union power_supply_propval *val)
137{
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100138 struct tps65090_charger *charger = power_supply_get_drvdata(psy);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400139
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
148static 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) {
Andrew Chewe2414212013-06-06 14:12:43 -0700172 ret = tps65090_enable_charging(charger);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400173 if (ret < 0)
174 return IRQ_HANDLED;
175 charger->ac_online = 1;
176 } else {
177 charger->ac_online = 0;
178 }
179
Andrew Chewe2414212013-06-06 14:12:43 -0700180 /* Clear interrupts. */
Doug Anderson193dcce2014-06-20 14:42:03 -0700181 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",
Andrew Chewe2414212013-06-06 14:12:43 -0700187 __func__, TPS65090_REG_INTR_STS);
Doug Anderson193dcce2014-06-20 14:42:03 -0700188 }
Andrew Chewe2414212013-06-06 14:12:43 -0700189 }
190
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400191 if (charger->prev_ac_online != charger->ac_online)
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100192 power_supply_changed(charger->ac);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400193
194 return IRQ_HANDLED;
195}
196
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400197static struct tps65090_platform_data *
198 tps65090_parse_dt_charger_data(struct platform_device *pdev)
199{
200 struct tps65090_platform_data *pdata;
Rhyland Klein594f8f82013-03-21 16:33:05 -0400201 struct device_node *np = pdev->dev.of_node;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400202 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}
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400218
Doug Anderson193dcce2014-06-20 14:42:03 -0700219static 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
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100231static 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
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400239static int tps65090_charger_probe(struct platform_device *pdev)
240{
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400241 struct tps65090_charger *cdata;
242 struct tps65090_platform_data *pdata;
Krzysztof Kozlowski2dc92152015-03-12 08:44:02 +0100243 struct power_supply_config psy_cfg = {};
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400244 uint8_t status1 = 0;
245 int ret;
246 int irq;
247
248 pdata = dev_get_platdata(pdev->dev.parent);
249
Manish Badarkhee47bcba2013-09-28 10:02:24 +0530250 if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400251 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
Jingoo Hane0835872013-05-23 19:34:39 +0900265 platform_set_drvdata(pdev, cdata);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400266
267 cdata->dev = &pdev->dev;
268 cdata->pdata = pdata;
269
Krzysztof Kozlowski2dc92152015-03-12 08:44:02 +0100270 psy_cfg.supplied_to = pdata->supplied_to;
271 psy_cfg.num_supplicants = pdata->num_supplicants;
272 psy_cfg.of_node = pdev->dev.of_node;
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100273 psy_cfg.drv_data = cdata;
Krzysztof Kozlowski2dc92152015-03-12 08:44:02 +0100274
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100275 cdata->ac = power_supply_register(&pdev->dev, &tps65090_charger_desc,
276 &psy_cfg);
277 if (IS_ERR(cdata->ac)) {
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400278 dev_err(&pdev->dev, "failed: power supply register\n");
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100279 return PTR_ERR(cdata->ac);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400280 }
281
282 irq = platform_get_irq(pdev, 0);
Doug Anderson193dcce2014-06-20 14:42:03 -0700283 if (irq < 0)
284 irq = -ENXIO;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400285 cdata->irq = irq;
286
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400287 ret = tps65090_config_charger(cdata);
288 if (ret < 0) {
289 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
Wei Yongjun0ed81392013-09-23 18:04:19 +0800290 goto fail_unregister_supply;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400291 }
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);
Wei Yongjun0ed81392013-09-23 18:04:19 +0800299 goto fail_unregister_supply;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400300 }
301
302 if (status1 != 0) {
Andrew Chewe2414212013-06-06 14:12:43 -0700303 ret = tps65090_enable_charging(cdata);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400304 if (ret < 0) {
305 dev_err(cdata->dev, "error enabling charger\n");
Wei Yongjun0ed81392013-09-23 18:04:19 +0800306 goto fail_unregister_supply;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400307 }
308 cdata->ac_online = 1;
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100309 power_supply_changed(cdata->ac);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400310 }
311
Doug Anderson193dcce2014-06-20 14:42:03 -0700312 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
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400333 return 0;
334
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400335fail_unregister_supply:
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100336 power_supply_unregister(cdata->ac);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400337
338 return ret;
339}
340
341static int tps65090_charger_remove(struct platform_device *pdev)
342{
Jingoo Hane0835872013-05-23 19:34:39 +0900343 struct tps65090_charger *cdata = platform_get_drvdata(pdev);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400344
Doug Anderson193dcce2014-06-20 14:42:03 -0700345 if (cdata->irq == -ENXIO)
346 kthread_stop(cdata->poll_task);
Krzysztof Kozlowski297d7162015-03-12 08:44:11 +0100347 power_supply_unregister(cdata->ac);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400348
349 return 0;
350}
351
Fabian Frederick8fb08852015-03-16 20:17:12 +0100352static const struct of_device_id of_tps65090_charger_match[] = {
Rhyland Klein594f8f82013-03-21 16:33:05 -0400353 { .compatible = "ti,tps65090-charger", },
354 { /* end */ }
355};
Luis de Bethencourtc72b7bf2015-09-18 18:54:07 +0200356MODULE_DEVICE_TABLE(of, of_tps65090_charger_match);
Rhyland Klein594f8f82013-03-21 16:33:05 -0400357
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400358static struct platform_driver tps65090_charger_driver = {
359 .driver = {
360 .name = "tps65090-charger",
Rhyland Klein594f8f82013-03-21 16:33:05 -0400361 .of_match_table = of_tps65090_charger_match,
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400362 },
363 .probe = tps65090_charger_probe,
364 .remove = tps65090_charger_remove,
365};
366module_platform_driver(tps65090_charger_driver);
367
368MODULE_LICENSE("GPL v2");
369MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
370MODULE_DESCRIPTION("tps65090 battery charger driver");