summaryrefslogtreecommitdiffstats
path: root/drivers/power/tps65090-charger.c
blob: 0f4e5971dff5b979331753d08f53d6e27b4fbf33 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
/*
 * Battery charger driver for TI's tps65090
 *
 * Copyright (c) 2013, NVIDIA CORPORATION.  All rights reserved.

 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.

 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/freezer.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>

#include <linux/mfd/tps65090.h>

#define TPS65090_CHARGER_ENABLE	BIT(0)
#define TPS65090_VACG		BIT(1)
#define TPS65090_NOITERM	BIT(5)

#define POLL_INTERVAL		(HZ * 2)	/* Used when no irq */

struct tps65090_charger {
	struct	device	*dev;
	int	ac_online;
	int	prev_ac_online;
	int	irq;
	struct task_struct	*poll_task;
	bool			passive_mode;
	struct power_supply	ac;
	struct tps65090_platform_data *pdata;
};

static enum power_supply_property tps65090_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
};

static int tps65090_low_chrg_current(struct tps65090_charger *charger)
{
	int ret;

	if (charger->passive_mode)
		return 0;

	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5,
			TPS65090_NOITERM);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
			__func__, TPS65090_REG_CG_CTRL5);
		return ret;
	}
	return 0;
}

static int tps65090_enable_charging(struct tps65090_charger *charger)
{
	int ret;
	uint8_t ctrl0 = 0;

	if (charger->passive_mode)
		return 0;

	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0,
			    &ctrl0);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
				__func__, TPS65090_REG_CG_CTRL0);
		return ret;
	}

	ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0,
				(ctrl0 | TPS65090_CHARGER_ENABLE));
	if (ret < 0) {
		dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
				__func__, TPS65090_REG_CG_CTRL0);
		return ret;
	}
	return 0;
}

static int tps65090_config_charger(struct tps65090_charger *charger)
{
	uint8_t intrmask = 0;
	int ret;

	if (charger->passive_mode)
		return 0;

	if (charger->pdata->enable_low_current_chrg) {
		ret = tps65090_low_chrg_current(charger);
		if (ret < 0) {
			dev_err(charger->dev,
				"error configuring low charge current\n");
			return ret;
		}
	}

	/* Enable the VACG interrupt for AC power detect */
	ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
			    &intrmask);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
			__func__, TPS65090_REG_INTR_MASK);
		return ret;
	}

	ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
			     (intrmask | TPS65090_VACG));
	if (ret < 0) {
		dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
			__func__, TPS65090_REG_CG_CTRL0);
		return ret;
	}

	return 0;
}

static int tps65090_ac_get_property(struct power_supply *psy,
			enum power_supply_property psp,
			union power_supply_propval *val)
{
	struct tps65090_charger *charger = container_of(psy,
					struct tps65090_charger, ac);

	if (psp == POWER_SUPPLY_PROP_ONLINE) {
		val->intval = charger->ac_online;
		charger->prev_ac_online = charger->ac_online;
		return 0;
	}
	return -EINVAL;
}

static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
{
	struct tps65090_charger *charger = dev_id;
	int ret;
	uint8_t status1 = 0;
	uint8_t intrsts = 0;

	ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
			    &status1);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
				__func__, TPS65090_REG_CG_STATUS1);
		return IRQ_HANDLED;
	}
	msleep(75);
	ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
			    &intrsts);
	if (ret < 0) {
		dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
				__func__, TPS65090_REG_INTR_STS);
		return IRQ_HANDLED;
	}

	if (intrsts & TPS65090_VACG) {
		ret = tps65090_enable_charging(charger);
		if (ret < 0)
			return IRQ_HANDLED;
		charger->ac_online = 1;
	} else {
		charger->ac_online = 0;
	}

	/* Clear interrupts. */
	if (!charger->passive_mode) {
		ret = tps65090_write(charger->dev->parent,
				     TPS65090_REG_INTR_STS, 0x00);
		if (ret < 0) {
			dev_err(charger->dev,
				"%s(): Error in writing reg 0x%x\n",
				__func__, TPS65090_REG_INTR_STS);
		}
	}

	if (charger->prev_ac_online != charger->ac_online)
		power_supply_changed(&charger->ac);

	return IRQ_HANDLED;
}

static struct tps65090_platform_data *
		tps65090_parse_dt_charger_data(struct platform_device *pdev)
{
	struct tps65090_platform_data *pdata;
	struct device_node *np = pdev->dev.of_node;
	unsigned int prop;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata) {
		dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
		return NULL;
	}

	prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
	pdata->enable_low_current_chrg = prop;

	pdata->irq_base = -1;

	return pdata;

}

static int tps65090_charger_poll_task(void *data)
{
	set_freezable();

	while (!kthread_should_stop()) {
		schedule_timeout_interruptible(POLL_INTERVAL);
		try_to_freeze();
		tps65090_charger_isr(-1, data);
	}
	return 0;
}

static int tps65090_charger_probe(struct platform_device *pdev)
{
	struct tps65090_charger *cdata;
	struct tps65090_platform_data *pdata;
	uint8_t status1 = 0;
	int ret;
	int irq;

	pdata = dev_get_platdata(pdev->dev.parent);

	if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node)
		pdata = tps65090_parse_dt_charger_data(pdev);

	if (!pdata) {
		dev_err(&pdev->dev, "%s():no platform data available\n",
				__func__);
		return -ENODEV;
	}

	cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
	if (!cdata) {
		dev_err(&pdev->dev, "failed to allocate memory status\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, cdata);

	cdata->dev			= &pdev->dev;
	cdata->pdata			= pdata;

	cdata->ac.name			= "tps65090-ac";
	cdata->ac.type			= POWER_SUPPLY_TYPE_MAINS;
	cdata->ac.get_property		= tps65090_ac_get_property;
	cdata->ac.properties		= tps65090_ac_props;
	cdata->ac.num_properties	= ARRAY_SIZE(tps65090_ac_props);
	cdata->ac.supplied_to		= pdata->supplied_to;
	cdata->ac.num_supplicants	= pdata->num_supplicants;
	cdata->ac.of_node		= pdev->dev.of_node;

	ret = power_supply_register(&pdev->dev, &cdata->ac);
	if (ret) {
		dev_err(&pdev->dev, "failed: power supply register\n");
		return ret;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
		irq = -ENXIO;
	cdata->irq = irq;

	ret = tps65090_config_charger(cdata);
	if (ret < 0) {
		dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
		goto fail_unregister_supply;
	}

	/* Check for charger presence */
	ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
			&status1);
	if (ret < 0) {
		dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
			TPS65090_REG_CG_STATUS1);
		goto fail_unregister_supply;
	}

	if (status1 != 0) {
		ret = tps65090_enable_charging(cdata);
		if (ret < 0) {
			dev_err(cdata->dev, "error enabling charger\n");
			goto fail_unregister_supply;
		}
		cdata->ac_online = 1;
		power_supply_changed(&cdata->ac);
	}

	if (irq != -ENXIO) {
		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
			tps65090_charger_isr, 0, "tps65090-charger", cdata);
		if (ret) {
			dev_err(cdata->dev,
				"Unable to register irq %d err %d\n", irq,
				ret);
			goto fail_unregister_supply;
		}
	} else {
		cdata->poll_task = kthread_run(tps65090_charger_poll_task,
					      cdata, "ktps65090charger");
		cdata->passive_mode = true;
		if (IS_ERR(cdata->poll_task)) {
			ret = PTR_ERR(cdata->poll_task);
			dev_err(cdata->dev,
				"Unable to run kthread err %d\n", ret);
			goto fail_unregister_supply;
		}
	}

	return 0;

fail_unregister_supply:
	power_supply_unregister(&cdata->ac);

	return ret;
}

static int tps65090_charger_remove(struct platform_device *pdev)
{
	struct tps65090_charger *cdata = platform_get_drvdata(pdev);

	if (cdata->irq == -ENXIO)
		kthread_stop(cdata->poll_task);
	power_supply_unregister(&cdata->ac);

	return 0;
}

static struct of_device_id of_tps65090_charger_match[] = {
	{ .compatible = "ti,tps65090-charger", },
	{ /* end */ }
};

static struct platform_driver tps65090_charger_driver = {
	.driver	= {
		.name	= "tps65090-charger",
		.of_match_table = of_tps65090_charger_match,
	},
	.probe	= tps65090_charger_probe,
	.remove = tps65090_charger_remove,
};
module_platform_driver(tps65090_charger_driver);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
MODULE_DESCRIPTION("tps65090 battery charger driver");