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Commit | Line | Data |
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6f8da5df RK |
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 | */ | |
e47bcba4 | 18 | #include <linux/delay.h> |
6f8da5df | 19 | #include <linux/err.h> |
193dcced | 20 | #include <linux/freezer.h> |
6f8da5df RK |
21 | #include <linux/init.h> |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/kernel.h> | |
193dcced | 24 | #include <linux/kthread.h> |
6f8da5df | 25 | #include <linux/module.h> |
e47bcba4 | 26 | #include <linux/of_device.h> |
6f8da5df RK |
27 | #include <linux/platform_device.h> |
28 | #include <linux/power_supply.h> | |
e47bcba4 MB |
29 | #include <linux/slab.h> |
30 | ||
6f8da5df RK |
31 | #include <linux/mfd/tps65090.h> |
32 | ||
6f8da5df RK |
33 | #define TPS65090_CHARGER_ENABLE BIT(0) |
34 | #define TPS65090_VACG BIT(1) | |
35 | #define TPS65090_NOITERM BIT(5) | |
36 | ||
193dcced DA |
37 | #define POLL_INTERVAL (HZ * 2) /* Used when no irq */ |
38 | ||
6f8da5df RK |
39 | struct tps65090_charger { |
40 | struct device *dev; | |
41 | int ac_online; | |
42 | int prev_ac_online; | |
43 | int irq; | |
193dcced DA |
44 | struct task_struct *poll_task; |
45 | bool passive_mode; | |
6f8da5df RK |
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 | ||
193dcced DA |
58 | if (charger->passive_mode) |
59 | return 0; | |
60 | ||
6f8da5df RK |
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 | ||
e2414217 | 71 | static int tps65090_enable_charging(struct tps65090_charger *charger) |
6f8da5df RK |
72 | { |
73 | int ret; | |
74 | uint8_t ctrl0 = 0; | |
75 | ||
193dcced DA |
76 | if (charger->passive_mode) |
77 | return 0; | |
78 | ||
6f8da5df RK |
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) { | |
e2414217 | 90 | dev_err(charger->dev, "%s(): error writing in register 0x%x\n", |
6f8da5df RK |
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 | { | |
e2414217 | 99 | uint8_t intrmask = 0; |
6f8da5df RK |
100 | int ret; |
101 | ||
193dcced DA |
102 | if (charger->passive_mode) |
103 | return 0; | |
104 | ||
6f8da5df RK |
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 | ||
e2414217 AC |
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 | ||
6f8da5df RK |
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 = container_of(psy, | |
139 | struct tps65090_charger, ac); | |
140 | ||
141 | if (psp == POWER_SUPPLY_PROP_ONLINE) { | |
142 | val->intval = charger->ac_online; | |
143 | charger->prev_ac_online = charger->ac_online; | |
144 | return 0; | |
145 | } | |
146 | return -EINVAL; | |
147 | } | |
148 | ||
149 | static irqreturn_t tps65090_charger_isr(int irq, void *dev_id) | |
150 | { | |
151 | struct tps65090_charger *charger = dev_id; | |
152 | int ret; | |
153 | uint8_t status1 = 0; | |
154 | uint8_t intrsts = 0; | |
155 | ||
156 | ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1, | |
157 | &status1); | |
158 | if (ret < 0) { | |
159 | dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n", | |
160 | __func__, TPS65090_REG_CG_STATUS1); | |
161 | return IRQ_HANDLED; | |
162 | } | |
163 | msleep(75); | |
164 | ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS, | |
165 | &intrsts); | |
166 | if (ret < 0) { | |
167 | dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n", | |
168 | __func__, TPS65090_REG_INTR_STS); | |
169 | return IRQ_HANDLED; | |
170 | } | |
171 | ||
172 | if (intrsts & TPS65090_VACG) { | |
e2414217 | 173 | ret = tps65090_enable_charging(charger); |
6f8da5df RK |
174 | if (ret < 0) |
175 | return IRQ_HANDLED; | |
176 | charger->ac_online = 1; | |
177 | } else { | |
178 | charger->ac_online = 0; | |
179 | } | |
180 | ||
e2414217 | 181 | /* Clear interrupts. */ |
193dcced DA |
182 | if (!charger->passive_mode) { |
183 | ret = tps65090_write(charger->dev->parent, | |
184 | TPS65090_REG_INTR_STS, 0x00); | |
185 | if (ret < 0) { | |
186 | dev_err(charger->dev, | |
187 | "%s(): Error in writing reg 0x%x\n", | |
e2414217 | 188 | __func__, TPS65090_REG_INTR_STS); |
193dcced | 189 | } |
e2414217 AC |
190 | } |
191 | ||
6f8da5df RK |
192 | if (charger->prev_ac_online != charger->ac_online) |
193 | power_supply_changed(&charger->ac); | |
194 | ||
195 | return IRQ_HANDLED; | |
196 | } | |
197 | ||
6f8da5df RK |
198 | static struct tps65090_platform_data * |
199 | tps65090_parse_dt_charger_data(struct platform_device *pdev) | |
200 | { | |
201 | struct tps65090_platform_data *pdata; | |
594f8f88 | 202 | struct device_node *np = pdev->dev.of_node; |
6f8da5df RK |
203 | unsigned int prop; |
204 | ||
205 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
206 | if (!pdata) { | |
207 | dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n"); | |
208 | return NULL; | |
209 | } | |
210 | ||
211 | prop = of_property_read_bool(np, "ti,enable-low-current-chrg"); | |
212 | pdata->enable_low_current_chrg = prop; | |
213 | ||
214 | pdata->irq_base = -1; | |
215 | ||
216 | return pdata; | |
217 | ||
218 | } | |
6f8da5df | 219 | |
193dcced DA |
220 | static int tps65090_charger_poll_task(void *data) |
221 | { | |
222 | set_freezable(); | |
223 | ||
224 | while (!kthread_should_stop()) { | |
225 | schedule_timeout_interruptible(POLL_INTERVAL); | |
226 | try_to_freeze(); | |
227 | tps65090_charger_isr(-1, data); | |
228 | } | |
229 | return 0; | |
230 | } | |
231 | ||
6f8da5df RK |
232 | static int tps65090_charger_probe(struct platform_device *pdev) |
233 | { | |
6f8da5df RK |
234 | struct tps65090_charger *cdata; |
235 | struct tps65090_platform_data *pdata; | |
236 | uint8_t status1 = 0; | |
237 | int ret; | |
238 | int irq; | |
239 | ||
240 | pdata = dev_get_platdata(pdev->dev.parent); | |
241 | ||
e47bcba4 | 242 | if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node) |
6f8da5df RK |
243 | pdata = tps65090_parse_dt_charger_data(pdev); |
244 | ||
245 | if (!pdata) { | |
246 | dev_err(&pdev->dev, "%s():no platform data available\n", | |
247 | __func__); | |
248 | return -ENODEV; | |
249 | } | |
250 | ||
251 | cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL); | |
252 | if (!cdata) { | |
253 | dev_err(&pdev->dev, "failed to allocate memory status\n"); | |
254 | return -ENOMEM; | |
255 | } | |
256 | ||
e0835879 | 257 | platform_set_drvdata(pdev, cdata); |
6f8da5df RK |
258 | |
259 | cdata->dev = &pdev->dev; | |
260 | cdata->pdata = pdata; | |
261 | ||
262 | cdata->ac.name = "tps65090-ac"; | |
263 | cdata->ac.type = POWER_SUPPLY_TYPE_MAINS; | |
264 | cdata->ac.get_property = tps65090_ac_get_property; | |
265 | cdata->ac.properties = tps65090_ac_props; | |
266 | cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props); | |
267 | cdata->ac.supplied_to = pdata->supplied_to; | |
268 | cdata->ac.num_supplicants = pdata->num_supplicants; | |
605860bc | 269 | cdata->ac.of_node = pdev->dev.of_node; |
6f8da5df RK |
270 | |
271 | ret = power_supply_register(&pdev->dev, &cdata->ac); | |
272 | if (ret) { | |
273 | dev_err(&pdev->dev, "failed: power supply register\n"); | |
274 | return ret; | |
275 | } | |
276 | ||
277 | irq = platform_get_irq(pdev, 0); | |
193dcced DA |
278 | if (irq < 0) |
279 | irq = -ENXIO; | |
6f8da5df RK |
280 | cdata->irq = irq; |
281 | ||
6f8da5df RK |
282 | ret = tps65090_config_charger(cdata); |
283 | if (ret < 0) { | |
284 | dev_err(&pdev->dev, "charger config failed, err %d\n", ret); | |
0ed81393 | 285 | goto fail_unregister_supply; |
6f8da5df RK |
286 | } |
287 | ||
288 | /* Check for charger presence */ | |
289 | ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1, | |
290 | &status1); | |
291 | if (ret < 0) { | |
292 | dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__, | |
293 | TPS65090_REG_CG_STATUS1); | |
0ed81393 | 294 | goto fail_unregister_supply; |
6f8da5df RK |
295 | } |
296 | ||
297 | if (status1 != 0) { | |
e2414217 | 298 | ret = tps65090_enable_charging(cdata); |
6f8da5df RK |
299 | if (ret < 0) { |
300 | dev_err(cdata->dev, "error enabling charger\n"); | |
0ed81393 | 301 | goto fail_unregister_supply; |
6f8da5df RK |
302 | } |
303 | cdata->ac_online = 1; | |
304 | power_supply_changed(&cdata->ac); | |
305 | } | |
306 | ||
193dcced DA |
307 | if (irq != -ENXIO) { |
308 | ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, | |
309 | tps65090_charger_isr, 0, "tps65090-charger", cdata); | |
310 | if (ret) { | |
311 | dev_err(cdata->dev, | |
312 | "Unable to register irq %d err %d\n", irq, | |
313 | ret); | |
314 | goto fail_unregister_supply; | |
315 | } | |
316 | } else { | |
317 | cdata->poll_task = kthread_run(tps65090_charger_poll_task, | |
318 | cdata, "ktps65090charger"); | |
319 | cdata->passive_mode = true; | |
320 | if (IS_ERR(cdata->poll_task)) { | |
321 | ret = PTR_ERR(cdata->poll_task); | |
322 | dev_err(cdata->dev, | |
323 | "Unable to run kthread err %d\n", ret); | |
324 | goto fail_unregister_supply; | |
325 | } | |
326 | } | |
327 | ||
6f8da5df RK |
328 | return 0; |
329 | ||
6f8da5df RK |
330 | fail_unregister_supply: |
331 | power_supply_unregister(&cdata->ac); | |
332 | ||
333 | return ret; | |
334 | } | |
335 | ||
336 | static int tps65090_charger_remove(struct platform_device *pdev) | |
337 | { | |
e0835879 | 338 | struct tps65090_charger *cdata = platform_get_drvdata(pdev); |
6f8da5df | 339 | |
193dcced DA |
340 | if (cdata->irq == -ENXIO) |
341 | kthread_stop(cdata->poll_task); | |
6f8da5df RK |
342 | power_supply_unregister(&cdata->ac); |
343 | ||
344 | return 0; | |
345 | } | |
346 | ||
594f8f88 RK |
347 | static struct of_device_id of_tps65090_charger_match[] = { |
348 | { .compatible = "ti,tps65090-charger", }, | |
349 | { /* end */ } | |
350 | }; | |
351 | ||
6f8da5df RK |
352 | static struct platform_driver tps65090_charger_driver = { |
353 | .driver = { | |
354 | .name = "tps65090-charger", | |
594f8f88 | 355 | .of_match_table = of_tps65090_charger_match, |
6f8da5df RK |
356 | .owner = THIS_MODULE, |
357 | }, | |
358 | .probe = tps65090_charger_probe, | |
359 | .remove = tps65090_charger_remove, | |
360 | }; | |
361 | module_platform_driver(tps65090_charger_driver); | |
362 | ||
363 | MODULE_LICENSE("GPL v2"); | |
364 | MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>"); | |
365 | MODULE_DESCRIPTION("tps65090 battery charger driver"); |