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