1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Battery charger driver for TI's tps65090 |
4 | * |
5 | * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. |
6 | |
7 | */ |
8 | #include <linux/delay.h> |
9 | #include <linux/err.h> |
10 | #include <linux/freezer.h> |
11 | #include <linux/init.h> |
12 | #include <linux/interrupt.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/kthread.h> |
15 | #include <linux/module.h> |
16 | #include <linux/of.h> |
17 | #include <linux/platform_device.h> |
18 | #include <linux/power_supply.h> |
19 | #include <linux/slab.h> |
20 | |
21 | #include <linux/mfd/tps65090.h> |
22 | |
23 | #define TPS65090_CHARGER_ENABLE BIT(0) |
24 | #define TPS65090_VACG BIT(1) |
25 | #define TPS65090_NOITERM BIT(5) |
26 | |
27 | #define POLL_INTERVAL (HZ * 2) /* Used when no irq */ |
28 | |
29 | struct tps65090_charger { |
30 | struct device *dev; |
31 | int ac_online; |
32 | int prev_ac_online; |
33 | int irq; |
34 | struct task_struct *poll_task; |
35 | bool passive_mode; |
36 | struct power_supply *ac; |
37 | struct tps65090_platform_data *pdata; |
38 | }; |
39 | |
40 | static enum power_supply_property tps65090_ac_props[] = { |
41 | POWER_SUPPLY_PROP_ONLINE, |
42 | }; |
43 | |
44 | static int tps65090_low_chrg_current(struct tps65090_charger *charger) |
45 | { |
46 | int ret; |
47 | |
48 | if (charger->passive_mode) |
49 | return 0; |
50 | |
51 | ret = tps65090_write(dev: charger->dev->parent, TPS65090_REG_CG_CTRL5, |
52 | TPS65090_NOITERM); |
53 | if (ret < 0) { |
54 | dev_err(charger->dev, "%s(): error reading in register 0x%x\n" , |
55 | __func__, TPS65090_REG_CG_CTRL5); |
56 | return ret; |
57 | } |
58 | return 0; |
59 | } |
60 | |
61 | static int tps65090_enable_charging(struct tps65090_charger *charger) |
62 | { |
63 | int ret; |
64 | uint8_t ctrl0 = 0; |
65 | |
66 | if (charger->passive_mode) |
67 | return 0; |
68 | |
69 | ret = tps65090_read(dev: charger->dev->parent, TPS65090_REG_CG_CTRL0, |
70 | val: &ctrl0); |
71 | if (ret < 0) { |
72 | dev_err(charger->dev, "%s(): error reading in register 0x%x\n" , |
73 | __func__, TPS65090_REG_CG_CTRL0); |
74 | return ret; |
75 | } |
76 | |
77 | ret = tps65090_write(dev: charger->dev->parent, TPS65090_REG_CG_CTRL0, |
78 | val: (ctrl0 | TPS65090_CHARGER_ENABLE)); |
79 | if (ret < 0) { |
80 | dev_err(charger->dev, "%s(): error writing in register 0x%x\n" , |
81 | __func__, TPS65090_REG_CG_CTRL0); |
82 | return ret; |
83 | } |
84 | return 0; |
85 | } |
86 | |
87 | static int tps65090_config_charger(struct tps65090_charger *charger) |
88 | { |
89 | uint8_t intrmask = 0; |
90 | int ret; |
91 | |
92 | if (charger->passive_mode) |
93 | return 0; |
94 | |
95 | if (charger->pdata->enable_low_current_chrg) { |
96 | ret = tps65090_low_chrg_current(charger); |
97 | if (ret < 0) { |
98 | dev_err(charger->dev, |
99 | "error configuring low charge current\n" ); |
100 | return ret; |
101 | } |
102 | } |
103 | |
104 | /* Enable the VACG interrupt for AC power detect */ |
105 | ret = tps65090_read(dev: charger->dev->parent, TPS65090_REG_INTR_MASK, |
106 | val: &intrmask); |
107 | if (ret < 0) { |
108 | dev_err(charger->dev, "%s(): error reading in register 0x%x\n" , |
109 | __func__, TPS65090_REG_INTR_MASK); |
110 | return ret; |
111 | } |
112 | |
113 | ret = tps65090_write(dev: charger->dev->parent, TPS65090_REG_INTR_MASK, |
114 | val: (intrmask | TPS65090_VACG)); |
115 | if (ret < 0) { |
116 | dev_err(charger->dev, "%s(): error writing in register 0x%x\n" , |
117 | __func__, TPS65090_REG_CG_CTRL0); |
118 | return ret; |
119 | } |
120 | |
121 | return 0; |
122 | } |
123 | |
124 | static int tps65090_ac_get_property(struct power_supply *psy, |
125 | enum power_supply_property psp, |
126 | union power_supply_propval *val) |
127 | { |
128 | struct tps65090_charger *charger = power_supply_get_drvdata(psy); |
129 | |
130 | if (psp == POWER_SUPPLY_PROP_ONLINE) { |
131 | val->intval = charger->ac_online; |
132 | charger->prev_ac_online = charger->ac_online; |
133 | return 0; |
134 | } |
135 | return -EINVAL; |
136 | } |
137 | |
138 | static irqreturn_t tps65090_charger_isr(int irq, void *dev_id) |
139 | { |
140 | struct tps65090_charger *charger = dev_id; |
141 | int ret; |
142 | uint8_t status1 = 0; |
143 | uint8_t intrsts = 0; |
144 | |
145 | ret = tps65090_read(dev: charger->dev->parent, TPS65090_REG_CG_STATUS1, |
146 | val: &status1); |
147 | if (ret < 0) { |
148 | dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n" , |
149 | __func__, TPS65090_REG_CG_STATUS1); |
150 | return IRQ_HANDLED; |
151 | } |
152 | msleep(msecs: 75); |
153 | ret = tps65090_read(dev: charger->dev->parent, TPS65090_REG_INTR_STS, |
154 | val: &intrsts); |
155 | if (ret < 0) { |
156 | dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n" , |
157 | __func__, TPS65090_REG_INTR_STS); |
158 | return IRQ_HANDLED; |
159 | } |
160 | |
161 | if (intrsts & TPS65090_VACG) { |
162 | ret = tps65090_enable_charging(charger); |
163 | if (ret < 0) |
164 | return IRQ_HANDLED; |
165 | charger->ac_online = 1; |
166 | } else { |
167 | charger->ac_online = 0; |
168 | } |
169 | |
170 | /* Clear interrupts. */ |
171 | if (!charger->passive_mode) { |
172 | ret = tps65090_write(dev: charger->dev->parent, |
173 | TPS65090_REG_INTR_STS, val: 0x00); |
174 | if (ret < 0) { |
175 | dev_err(charger->dev, |
176 | "%s(): Error in writing reg 0x%x\n" , |
177 | __func__, TPS65090_REG_INTR_STS); |
178 | } |
179 | } |
180 | |
181 | if (charger->prev_ac_online != charger->ac_online) |
182 | power_supply_changed(psy: charger->ac); |
183 | |
184 | return IRQ_HANDLED; |
185 | } |
186 | |
187 | static struct tps65090_platform_data * |
188 | tps65090_parse_dt_charger_data(struct platform_device *pdev) |
189 | { |
190 | struct tps65090_platform_data *pdata; |
191 | struct device_node *np = pdev->dev.of_node; |
192 | unsigned int prop; |
193 | |
194 | pdata = devm_kzalloc(dev: &pdev->dev, size: sizeof(*pdata), GFP_KERNEL); |
195 | if (!pdata) { |
196 | dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n" ); |
197 | return NULL; |
198 | } |
199 | |
200 | prop = of_property_read_bool(np, propname: "ti,enable-low-current-chrg" ); |
201 | pdata->enable_low_current_chrg = prop; |
202 | |
203 | pdata->irq_base = -1; |
204 | |
205 | return pdata; |
206 | |
207 | } |
208 | |
209 | static int tps65090_charger_poll_task(void *data) |
210 | { |
211 | set_freezable(); |
212 | |
213 | while (!kthread_should_stop()) { |
214 | schedule_timeout_interruptible(POLL_INTERVAL); |
215 | try_to_freeze(); |
216 | tps65090_charger_isr(irq: -1, dev_id: data); |
217 | } |
218 | return 0; |
219 | } |
220 | |
221 | static const struct power_supply_desc tps65090_charger_desc = { |
222 | .name = "tps65090-ac" , |
223 | .type = POWER_SUPPLY_TYPE_MAINS, |
224 | .get_property = tps65090_ac_get_property, |
225 | .properties = tps65090_ac_props, |
226 | .num_properties = ARRAY_SIZE(tps65090_ac_props), |
227 | }; |
228 | |
229 | static int tps65090_charger_probe(struct platform_device *pdev) |
230 | { |
231 | struct tps65090_charger *cdata; |
232 | struct tps65090_platform_data *pdata; |
233 | struct power_supply_config psy_cfg = {}; |
234 | uint8_t status1 = 0; |
235 | int ret; |
236 | int irq; |
237 | |
238 | pdata = dev_get_platdata(dev: pdev->dev.parent); |
239 | |
240 | if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node) |
241 | pdata = tps65090_parse_dt_charger_data(pdev); |
242 | |
243 | if (!pdata) { |
244 | dev_err(&pdev->dev, "%s():no platform data available\n" , |
245 | __func__); |
246 | return -ENODEV; |
247 | } |
248 | |
249 | cdata = devm_kzalloc(dev: &pdev->dev, size: sizeof(*cdata), GFP_KERNEL); |
250 | if (!cdata) { |
251 | dev_err(&pdev->dev, "failed to allocate memory status\n" ); |
252 | return -ENOMEM; |
253 | } |
254 | |
255 | platform_set_drvdata(pdev, data: cdata); |
256 | |
257 | cdata->dev = &pdev->dev; |
258 | cdata->pdata = pdata; |
259 | |
260 | psy_cfg.supplied_to = pdata->supplied_to; |
261 | psy_cfg.num_supplicants = pdata->num_supplicants; |
262 | psy_cfg.of_node = pdev->dev.of_node; |
263 | psy_cfg.drv_data = cdata; |
264 | |
265 | cdata->ac = power_supply_register(parent: &pdev->dev, desc: &tps65090_charger_desc, |
266 | cfg: &psy_cfg); |
267 | if (IS_ERR(ptr: cdata->ac)) { |
268 | dev_err(&pdev->dev, "failed: power supply register\n" ); |
269 | return PTR_ERR(ptr: cdata->ac); |
270 | } |
271 | |
272 | irq = platform_get_irq(pdev, 0); |
273 | if (irq < 0) |
274 | irq = -ENXIO; |
275 | cdata->irq = irq; |
276 | |
277 | ret = tps65090_config_charger(charger: cdata); |
278 | if (ret < 0) { |
279 | dev_err(&pdev->dev, "charger config failed, err %d\n" , ret); |
280 | goto fail_unregister_supply; |
281 | } |
282 | |
283 | /* Check for charger presence */ |
284 | ret = tps65090_read(dev: cdata->dev->parent, TPS65090_REG_CG_STATUS1, |
285 | val: &status1); |
286 | if (ret < 0) { |
287 | dev_err(cdata->dev, "%s(): Error in reading reg 0x%x" , __func__, |
288 | TPS65090_REG_CG_STATUS1); |
289 | goto fail_unregister_supply; |
290 | } |
291 | |
292 | if (status1 != 0) { |
293 | ret = tps65090_enable_charging(charger: cdata); |
294 | if (ret < 0) { |
295 | dev_err(cdata->dev, "error enabling charger\n" ); |
296 | goto fail_unregister_supply; |
297 | } |
298 | cdata->ac_online = 1; |
299 | power_supply_changed(psy: cdata->ac); |
300 | } |
301 | |
302 | if (irq != -ENXIO) { |
303 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq, NULL, |
304 | thread_fn: tps65090_charger_isr, IRQF_ONESHOT, devname: "tps65090-charger" , dev_id: cdata); |
305 | if (ret) { |
306 | dev_err(cdata->dev, |
307 | "Unable to register irq %d err %d\n" , irq, |
308 | ret); |
309 | goto fail_unregister_supply; |
310 | } |
311 | } else { |
312 | cdata->poll_task = kthread_run(tps65090_charger_poll_task, |
313 | cdata, "ktps65090charger" ); |
314 | cdata->passive_mode = true; |
315 | if (IS_ERR(ptr: cdata->poll_task)) { |
316 | ret = PTR_ERR(ptr: cdata->poll_task); |
317 | dev_err(cdata->dev, |
318 | "Unable to run kthread err %d\n" , ret); |
319 | goto fail_unregister_supply; |
320 | } |
321 | } |
322 | |
323 | return 0; |
324 | |
325 | fail_unregister_supply: |
326 | power_supply_unregister(psy: cdata->ac); |
327 | |
328 | return ret; |
329 | } |
330 | |
331 | static void tps65090_charger_remove(struct platform_device *pdev) |
332 | { |
333 | struct tps65090_charger *cdata = platform_get_drvdata(pdev); |
334 | |
335 | if (cdata->irq == -ENXIO) |
336 | kthread_stop(k: cdata->poll_task); |
337 | power_supply_unregister(psy: cdata->ac); |
338 | } |
339 | |
340 | static const struct of_device_id of_tps65090_charger_match[] = { |
341 | { .compatible = "ti,tps65090-charger" , }, |
342 | { /* end */ } |
343 | }; |
344 | MODULE_DEVICE_TABLE(of, of_tps65090_charger_match); |
345 | |
346 | static struct platform_driver tps65090_charger_driver = { |
347 | .driver = { |
348 | .name = "tps65090-charger" , |
349 | .of_match_table = of_tps65090_charger_match, |
350 | }, |
351 | .probe = tps65090_charger_probe, |
352 | .remove_new = tps65090_charger_remove, |
353 | }; |
354 | module_platform_driver(tps65090_charger_driver); |
355 | |
356 | MODULE_LICENSE("GPL v2" ); |
357 | MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>" ); |
358 | MODULE_DESCRIPTION("tps65090 battery charger driver" ); |
359 | |