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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 RK |
19 | #include <linux/err.h> |
20 | #include <linux/init.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
e47bcba4 | 24 | #include <linux/of_device.h> |
6f8da5df RK |
25 | #include <linux/platform_device.h> |
26 | #include <linux/power_supply.h> | |
e47bcba4 MB |
27 | #include <linux/slab.h> |
28 | ||
6f8da5df RK |
29 | #include <linux/mfd/tps65090.h> |
30 | ||
31 | #define TPS65090_REG_INTR_STS 0x00 | |
e2414217 | 32 | #define TPS65090_REG_INTR_MASK 0x02 |
6f8da5df RK |
33 | #define TPS65090_REG_CG_CTRL0 0x04 |
34 | #define TPS65090_REG_CG_CTRL1 0x05 | |
35 | #define TPS65090_REG_CG_CTRL2 0x06 | |
36 | #define TPS65090_REG_CG_CTRL3 0x07 | |
37 | #define TPS65090_REG_CG_CTRL4 0x08 | |
38 | #define TPS65090_REG_CG_CTRL5 0x09 | |
39 | #define TPS65090_REG_CG_STATUS1 0x0a | |
40 | #define TPS65090_REG_CG_STATUS2 0x0b | |
41 | ||
42 | #define TPS65090_CHARGER_ENABLE BIT(0) | |
43 | #define TPS65090_VACG BIT(1) | |
44 | #define TPS65090_NOITERM BIT(5) | |
45 | ||
46 | struct tps65090_charger { | |
47 | struct device *dev; | |
48 | int ac_online; | |
49 | int prev_ac_online; | |
50 | int irq; | |
51 | struct power_supply ac; | |
52 | struct tps65090_platform_data *pdata; | |
53 | }; | |
54 | ||
55 | static enum power_supply_property tps65090_ac_props[] = { | |
56 | POWER_SUPPLY_PROP_ONLINE, | |
57 | }; | |
58 | ||
59 | static int tps65090_low_chrg_current(struct tps65090_charger *charger) | |
60 | { | |
61 | int ret; | |
62 | ||
63 | ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5, | |
64 | TPS65090_NOITERM); | |
65 | if (ret < 0) { | |
66 | dev_err(charger->dev, "%s(): error reading in register 0x%x\n", | |
67 | __func__, TPS65090_REG_CG_CTRL5); | |
68 | return ret; | |
69 | } | |
70 | return 0; | |
71 | } | |
72 | ||
e2414217 | 73 | static int tps65090_enable_charging(struct tps65090_charger *charger) |
6f8da5df RK |
74 | { |
75 | int ret; | |
76 | uint8_t ctrl0 = 0; | |
77 | ||
78 | ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0, | |
79 | &ctrl0); | |
80 | if (ret < 0) { | |
81 | dev_err(charger->dev, "%s(): error reading in register 0x%x\n", | |
82 | __func__, TPS65090_REG_CG_CTRL0); | |
83 | return ret; | |
84 | } | |
85 | ||
86 | ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0, | |
87 | (ctrl0 | TPS65090_CHARGER_ENABLE)); | |
88 | if (ret < 0) { | |
e2414217 | 89 | dev_err(charger->dev, "%s(): error writing in register 0x%x\n", |
6f8da5df RK |
90 | __func__, TPS65090_REG_CG_CTRL0); |
91 | return ret; | |
92 | } | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static int tps65090_config_charger(struct tps65090_charger *charger) | |
97 | { | |
e2414217 | 98 | uint8_t intrmask = 0; |
6f8da5df RK |
99 | int ret; |
100 | ||
101 | if (charger->pdata->enable_low_current_chrg) { | |
102 | ret = tps65090_low_chrg_current(charger); | |
103 | if (ret < 0) { | |
104 | dev_err(charger->dev, | |
105 | "error configuring low charge current\n"); | |
106 | return ret; | |
107 | } | |
108 | } | |
109 | ||
e2414217 AC |
110 | /* Enable the VACG interrupt for AC power detect */ |
111 | ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_MASK, | |
112 | &intrmask); | |
113 | if (ret < 0) { | |
114 | dev_err(charger->dev, "%s(): error reading in register 0x%x\n", | |
115 | __func__, TPS65090_REG_INTR_MASK); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_MASK, | |
120 | (intrmask | TPS65090_VACG)); | |
121 | if (ret < 0) { | |
122 | dev_err(charger->dev, "%s(): error writing in register 0x%x\n", | |
123 | __func__, TPS65090_REG_CG_CTRL0); | |
124 | return ret; | |
125 | } | |
126 | ||
6f8da5df RK |
127 | return 0; |
128 | } | |
129 | ||
130 | static int tps65090_ac_get_property(struct power_supply *psy, | |
131 | enum power_supply_property psp, | |
132 | union power_supply_propval *val) | |
133 | { | |
134 | struct tps65090_charger *charger = container_of(psy, | |
135 | struct tps65090_charger, ac); | |
136 | ||
137 | if (psp == POWER_SUPPLY_PROP_ONLINE) { | |
138 | val->intval = charger->ac_online; | |
139 | charger->prev_ac_online = charger->ac_online; | |
140 | return 0; | |
141 | } | |
142 | return -EINVAL; | |
143 | } | |
144 | ||
145 | static irqreturn_t tps65090_charger_isr(int irq, void *dev_id) | |
146 | { | |
147 | struct tps65090_charger *charger = dev_id; | |
148 | int ret; | |
149 | uint8_t status1 = 0; | |
150 | uint8_t intrsts = 0; | |
151 | ||
152 | ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1, | |
153 | &status1); | |
154 | if (ret < 0) { | |
155 | dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n", | |
156 | __func__, TPS65090_REG_CG_STATUS1); | |
157 | return IRQ_HANDLED; | |
158 | } | |
159 | msleep(75); | |
160 | ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS, | |
161 | &intrsts); | |
162 | if (ret < 0) { | |
163 | dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n", | |
164 | __func__, TPS65090_REG_INTR_STS); | |
165 | return IRQ_HANDLED; | |
166 | } | |
167 | ||
168 | if (intrsts & TPS65090_VACG) { | |
e2414217 | 169 | ret = tps65090_enable_charging(charger); |
6f8da5df RK |
170 | if (ret < 0) |
171 | return IRQ_HANDLED; | |
172 | charger->ac_online = 1; | |
173 | } else { | |
174 | charger->ac_online = 0; | |
175 | } | |
176 | ||
e2414217 AC |
177 | /* Clear interrupts. */ |
178 | ret = tps65090_write(charger->dev->parent, TPS65090_REG_INTR_STS, 0x00); | |
179 | if (ret < 0) { | |
180 | dev_err(charger->dev, "%s(): Error in writing reg 0x%x\n", | |
181 | __func__, TPS65090_REG_INTR_STS); | |
182 | } | |
183 | ||
6f8da5df RK |
184 | if (charger->prev_ac_online != charger->ac_online) |
185 | power_supply_changed(&charger->ac); | |
186 | ||
187 | return IRQ_HANDLED; | |
188 | } | |
189 | ||
6f8da5df RK |
190 | static struct tps65090_platform_data * |
191 | tps65090_parse_dt_charger_data(struct platform_device *pdev) | |
192 | { | |
193 | struct tps65090_platform_data *pdata; | |
594f8f88 | 194 | struct device_node *np = pdev->dev.of_node; |
6f8da5df RK |
195 | unsigned int prop; |
196 | ||
197 | pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); | |
198 | if (!pdata) { | |
199 | dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n"); | |
200 | return NULL; | |
201 | } | |
202 | ||
203 | prop = of_property_read_bool(np, "ti,enable-low-current-chrg"); | |
204 | pdata->enable_low_current_chrg = prop; | |
205 | ||
206 | pdata->irq_base = -1; | |
207 | ||
208 | return pdata; | |
209 | ||
210 | } | |
6f8da5df RK |
211 | |
212 | static int tps65090_charger_probe(struct platform_device *pdev) | |
213 | { | |
6f8da5df RK |
214 | struct tps65090_charger *cdata; |
215 | struct tps65090_platform_data *pdata; | |
216 | uint8_t status1 = 0; | |
217 | int ret; | |
218 | int irq; | |
219 | ||
220 | pdata = dev_get_platdata(pdev->dev.parent); | |
221 | ||
e47bcba4 | 222 | if (IS_ENABLED(CONFIG_OF) && !pdata && pdev->dev.of_node) |
6f8da5df RK |
223 | pdata = tps65090_parse_dt_charger_data(pdev); |
224 | ||
225 | if (!pdata) { | |
226 | dev_err(&pdev->dev, "%s():no platform data available\n", | |
227 | __func__); | |
228 | return -ENODEV; | |
229 | } | |
230 | ||
231 | cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL); | |
232 | if (!cdata) { | |
233 | dev_err(&pdev->dev, "failed to allocate memory status\n"); | |
234 | return -ENOMEM; | |
235 | } | |
236 | ||
e0835879 | 237 | platform_set_drvdata(pdev, cdata); |
6f8da5df RK |
238 | |
239 | cdata->dev = &pdev->dev; | |
240 | cdata->pdata = pdata; | |
241 | ||
242 | cdata->ac.name = "tps65090-ac"; | |
243 | cdata->ac.type = POWER_SUPPLY_TYPE_MAINS; | |
244 | cdata->ac.get_property = tps65090_ac_get_property; | |
245 | cdata->ac.properties = tps65090_ac_props; | |
246 | cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props); | |
247 | cdata->ac.supplied_to = pdata->supplied_to; | |
248 | cdata->ac.num_supplicants = pdata->num_supplicants; | |
605860bc | 249 | cdata->ac.of_node = pdev->dev.of_node; |
6f8da5df RK |
250 | |
251 | ret = power_supply_register(&pdev->dev, &cdata->ac); | |
252 | if (ret) { | |
253 | dev_err(&pdev->dev, "failed: power supply register\n"); | |
254 | return ret; | |
255 | } | |
256 | ||
257 | irq = platform_get_irq(pdev, 0); | |
258 | if (irq <= 0) { | |
259 | dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq); | |
260 | ret = irq; | |
261 | goto fail_unregister_supply; | |
262 | } | |
263 | ||
264 | cdata->irq = irq; | |
265 | ||
266 | ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, | |
267 | tps65090_charger_isr, 0, "tps65090-charger", cdata); | |
268 | if (ret) { | |
269 | dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq, | |
270 | ret); | |
0ed81393 | 271 | goto fail_unregister_supply; |
6f8da5df RK |
272 | } |
273 | ||
274 | ret = tps65090_config_charger(cdata); | |
275 | if (ret < 0) { | |
276 | dev_err(&pdev->dev, "charger config failed, err %d\n", ret); | |
0ed81393 | 277 | goto fail_unregister_supply; |
6f8da5df RK |
278 | } |
279 | ||
280 | /* Check for charger presence */ | |
281 | ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1, | |
282 | &status1); | |
283 | if (ret < 0) { | |
284 | dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__, | |
285 | TPS65090_REG_CG_STATUS1); | |
0ed81393 | 286 | goto fail_unregister_supply; |
6f8da5df RK |
287 | } |
288 | ||
289 | if (status1 != 0) { | |
e2414217 | 290 | ret = tps65090_enable_charging(cdata); |
6f8da5df RK |
291 | if (ret < 0) { |
292 | dev_err(cdata->dev, "error enabling charger\n"); | |
0ed81393 | 293 | goto fail_unregister_supply; |
6f8da5df RK |
294 | } |
295 | cdata->ac_online = 1; | |
296 | power_supply_changed(&cdata->ac); | |
297 | } | |
298 | ||
299 | return 0; | |
300 | ||
6f8da5df RK |
301 | fail_unregister_supply: |
302 | power_supply_unregister(&cdata->ac); | |
303 | ||
304 | return ret; | |
305 | } | |
306 | ||
307 | static int tps65090_charger_remove(struct platform_device *pdev) | |
308 | { | |
e0835879 | 309 | struct tps65090_charger *cdata = platform_get_drvdata(pdev); |
6f8da5df | 310 | |
6f8da5df RK |
311 | power_supply_unregister(&cdata->ac); |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
594f8f88 RK |
316 | static struct of_device_id of_tps65090_charger_match[] = { |
317 | { .compatible = "ti,tps65090-charger", }, | |
318 | { /* end */ } | |
319 | }; | |
320 | ||
6f8da5df RK |
321 | static struct platform_driver tps65090_charger_driver = { |
322 | .driver = { | |
323 | .name = "tps65090-charger", | |
594f8f88 | 324 | .of_match_table = of_tps65090_charger_match, |
6f8da5df RK |
325 | .owner = THIS_MODULE, |
326 | }, | |
327 | .probe = tps65090_charger_probe, | |
328 | .remove = tps65090_charger_remove, | |
329 | }; | |
330 | module_platform_driver(tps65090_charger_driver); | |
331 | ||
332 | MODULE_LICENSE("GPL v2"); | |
333 | MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>"); | |
334 | MODULE_DESCRIPTION("tps65090 battery charger driver"); |