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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)
38
39struct 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
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
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
71static 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
97static 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
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
134static 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
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) {
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
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
197static 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
219static 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
231static 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
239static 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
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
335fail_unregister_supply:
336 power_supply_unregister(cdata->ac);
337
338 return ret;
339}
340
341static 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
352static const struct of_device_id of_tps65090_charger_match[] = {
353 { .compatible = "ti,tps65090-charger", },
354 { }
355};
356
357static struct platform_driver tps65090_charger_driver = {
358 .driver = {
359 .name = "tps65090-charger",
360 .of_match_table = of_tps65090_charger_match,
361 },
362 .probe = tps65090_charger_probe,
363 .remove = tps65090_charger_remove,
364};
365module_platform_driver(tps65090_charger_driver);
366
367MODULE_LICENSE("GPL v2");
368MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
369MODULE_DESCRIPTION("tps65090 battery charger driver");
370
