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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 */
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
Andrew Chewe2414212013-06-06 14:12:43 -070030#define TPS65090_REG_INTR_MASK 0x02
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040031#define TPS65090_REG_CG_CTRL0 0x04
32#define TPS65090_REG_CG_CTRL1 0x05
33#define TPS65090_REG_CG_CTRL2 0x06
34#define TPS65090_REG_CG_CTRL3 0x07
35#define TPS65090_REG_CG_CTRL4 0x08
36#define TPS65090_REG_CG_CTRL5 0x09
37#define TPS65090_REG_CG_STATUS1 0x0a
38#define TPS65090_REG_CG_STATUS2 0x0b
39
40#define TPS65090_CHARGER_ENABLE BIT(0)
41#define TPS65090_VACG BIT(1)
42#define TPS65090_NOITERM BIT(5)
43
44struct tps65090_charger {
45 struct device *dev;
46 int ac_online;
47 int prev_ac_online;
48 int irq;
49 struct power_supply ac;
50 struct tps65090_platform_data *pdata;
51};
52
53static enum power_supply_property tps65090_ac_props[] = {
54 POWER_SUPPLY_PROP_ONLINE,
55};
56
57static int tps65090_low_chrg_current(struct tps65090_charger *charger)
58{
59 int ret;
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
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
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) {
Andrew Chewe2414212013-06-06 14:12:43 -070087 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040088 __func__, TPS65090_REG_CG_CTRL0);
89 return ret;
90 }
91 return 0;
92}
93
94static int tps65090_config_charger(struct tps65090_charger *charger)
95{
Andrew Chewe2414212013-06-06 14:12:43 -070096 uint8_t intrmask = 0;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -040097 int ret;
98
99 if (charger->pdata->enable_low_current_chrg) {
100 ret = tps65090_low_chrg_current(charger);
101 if (ret < 0) {
102 dev_err(charger->dev,
103 "error configuring low charge current\n");
104 return ret;
105 }
106 }
107
Andrew Chewe2414212013-06-06 14:12:43 -0700108 /* Enable the VACG interrupt for AC power detect */
109 ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK,
110 &intrmask);
111 if (ret < 0) {
112 dev_err(charger->dev, "%s(): error reading in register 0x%x\n",
113 __func__, TPS65090_REG_INTR_MASK);
114 return ret;
115 }
116
117 ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK,
118 (intrmask | TPS65090_VACG));
119 if (ret < 0) {
120 dev_err(charger->dev, "%s(): error writing in register 0x%x\n",
121 __func__, TPS65090_REG_CG_CTRL0);
122 return ret;
123 }
124
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400125 return 0;
126}
127
128static int tps65090_ac_get_property(struct power_supply *psy,
129 enum power_supply_property psp,
130 union power_supply_propval *val)
131{
132 struct tps65090_charger *charger = container_of(psy,
133 struct tps65090_charger, ac);
134
135 if (psp == POWER_SUPPLY_PROP_ONLINE) {
136 val->intval = charger->ac_online;
137 charger->prev_ac_online = charger->ac_online;
138 return 0;
139 }
140 return -EINVAL;
141}
142
143static irqreturn_t tps65090_charger_isr(int irq, void *dev_id)
144{
145 struct tps65090_charger *charger = dev_id;
146 int ret;
147 uint8_t status1 = 0;
148 uint8_t intrsts = 0;
149
150 ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1,
151 &status1);
152 if (ret < 0) {
153 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
154 __func__, TPS65090_REG_CG_STATUS1);
155 return IRQ_HANDLED;
156 }
157 msleep(75);
158 ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS,
159 &intrsts);
160 if (ret < 0) {
161 dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n",
162 __func__, TPS65090_REG_INTR_STS);
163 return IRQ_HANDLED;
164 }
165
166 if (intrsts & TPS65090_VACG) {
Andrew Chewe2414212013-06-06 14:12:43 -0700167 ret = tps65090_enable_charging(charger);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400168 if (ret < 0)
169 return IRQ_HANDLED;
170 charger->ac_online = 1;
171 } else {
172 charger->ac_online = 0;
173 }
174
Andrew Chewe2414212013-06-06 14:12:43 -0700175 /* Clear interrupts. */
176 ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_STS, 0x00);
177 if (ret < 0) {
178 dev_err(charger->dev, "%s(): Error in writing reg 0x%x\n",
179 __func__, TPS65090_REG_INTR_STS);
180 }
181
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400182 if (charger->prev_ac_online != charger->ac_online)
183 power_supply_changed(&charger->ac);
184
185 return IRQ_HANDLED;
186}
187
188#if defined(CONFIG_OF)
189
190#include <linux/of_device.h>
191
192static struct tps65090_platform_data *
193 tps65090_parse_dt_charger_data(struct platform_device *pdev)
194{
195 struct tps65090_platform_data *pdata;
Rhyland Klein594f8f82013-03-21 16:33:05 -0400196 struct device_node *np = pdev->dev.of_node;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400197 unsigned int prop;
198
199 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
200 if (!pdata) {
201 dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n");
202 return NULL;
203 }
204
205 prop = of_property_read_bool(np, "ti,enable-low-current-chrg");
206 pdata->enable_low_current_chrg = prop;
207
208 pdata->irq_base = -1;
209
210 return pdata;
211
212}
213#else
214static struct tps65090_platform_data *
215 tps65090_parse_dt_charger_data(struct platform_device *pdev)
216{
217 return NULL;
218}
219#endif
220
221static int tps65090_charger_probe(struct platform_device *pdev)
222{
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400223 struct tps65090_charger *cdata;
224 struct tps65090_platform_data *pdata;
225 uint8_t status1 = 0;
226 int ret;
227 int irq;
228
229 pdata = dev_get_platdata(pdev->dev.parent);
230
Rhyland Klein594f8f82013-03-21 16:33:05 -0400231 if (!pdata && pdev->dev.of_node)
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400232 pdata = tps65090_parse_dt_charger_data(pdev);
233
234 if (!pdata) {
235 dev_err(&pdev->dev, "%s():no platform data available\n",
236 __func__);
237 return -ENODEV;
238 }
239
240 cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL);
241 if (!cdata) {
242 dev_err(&pdev->dev, "failed to allocate memory status\n");
243 return -ENOMEM;
244 }
245
Jingoo Hane0835872013-05-23 19:34:39 +0900246 platform_set_drvdata(pdev, cdata);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400247
248 cdata->dev = &pdev->dev;
249 cdata->pdata = pdata;
250
251 cdata->ac.name = "tps65090-ac";
252 cdata->ac.type = POWER_SUPPLY_TYPE_MAINS;
253 cdata->ac.get_property = tps65090_ac_get_property;
254 cdata->ac.properties = tps65090_ac_props;
255 cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props);
256 cdata->ac.supplied_to = pdata->supplied_to;
257 cdata->ac.num_supplicants = pdata->num_supplicants;
Rhyland Klein605860b2013-06-10 17:26:41 -0400258 cdata->ac.of_node = pdev->dev.of_node;
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400259
260 ret = power_supply_register(&pdev->dev, &cdata->ac);
261 if (ret) {
262 dev_err(&pdev->dev, "failed: power supply register\n");
263 return ret;
264 }
265
266 irq = platform_get_irq(pdev, 0);
267 if (irq <= 0) {
268 dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq);
269 ret = irq;
270 goto fail_unregister_supply;
271 }
272
273 cdata->irq = irq;
274
275 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
276 tps65090_charger_isr, 0, "tps65090-charger", cdata);
277 if (ret) {
278 dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq,
279 ret);
280 goto fail_free_irq;
281 }
282
283 ret = tps65090_config_charger(cdata);
284 if (ret < 0) {
285 dev_err(&pdev->dev, "charger config failed, err %d\n", ret);
286 goto fail_free_irq;
287 }
288
289 /* Check for charger presence */
290 ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1,
291 &status1);
292 if (ret < 0) {
293 dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__,
294 TPS65090_REG_CG_STATUS1);
295 goto fail_free_irq;
296 }
297
298 if (status1 != 0) {
Andrew Chewe2414212013-06-06 14:12:43 -0700299 ret = tps65090_enable_charging(cdata);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400300 if (ret < 0) {
301 dev_err(cdata->dev, "error enabling charger\n");
302 goto fail_free_irq;
303 }
304 cdata->ac_online = 1;
305 power_supply_changed(&cdata->ac);
306 }
307
308 return 0;
309
310fail_free_irq:
311 devm_free_irq(cdata->dev, irq, cdata);
312fail_unregister_supply:
313 power_supply_unregister(&cdata->ac);
314
315 return ret;
316}
317
318static int tps65090_charger_remove(struct platform_device *pdev)
319{
Jingoo Hane0835872013-05-23 19:34:39 +0900320 struct tps65090_charger *cdata = platform_get_drvdata(pdev);
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400321
322 devm_free_irq(cdata->dev, cdata->irq, cdata);
323 power_supply_unregister(&cdata->ac);
324
325 return 0;
326}
327
Rhyland Klein594f8f82013-03-21 16:33:05 -0400328static struct of_device_id of_tps65090_charger_match[] = {
329 { .compatible = "ti,tps65090-charger", },
330 { /* end */ }
331};
332
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400333static struct platform_driver tps65090_charger_driver = {
334 .driver = {
335 .name = "tps65090-charger",
Rhyland Klein594f8f82013-03-21 16:33:05 -0400336 .of_match_table = of_tps65090_charger_match,
Rhyland Klein6f8da5d2013-03-12 18:08:09 -0400337 .owner = THIS_MODULE,
338 },
339 .probe = tps65090_charger_probe,
340 .remove = tps65090_charger_remove,
341};
342module_platform_driver(tps65090_charger_driver);
343
344MODULE_LICENSE("GPL v2");
345MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>");
346MODULE_DESCRIPTION("tps65090 battery charger driver");