Commit | Line | Data |
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3636859b EBS |
1 | /* |
2 | * Battery charger driver for TI's tps65217 | |
3 | * | |
4 | * Copyright (c) 2015, Collabora Ltd. | |
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 | ||
19 | /* | |
20 | * Battery charger driver for TI's tps65217 | |
21 | */ | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/kthread.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/of.h> | |
32 | #include <linux/of_device.h> | |
33 | #include <linux/power_supply.h> | |
34 | ||
35 | #include <linux/mfd/core.h> | |
36 | #include <linux/mfd/tps65217.h> | |
37 | ||
38 | #define POLL_INTERVAL (HZ * 2) | |
39 | ||
40 | struct tps65217_charger { | |
41 | struct tps65217 *tps; | |
42 | struct device *dev; | |
43 | struct power_supply *ac; | |
44 | ||
45 | int ac_online; | |
46 | int prev_ac_online; | |
47 | ||
48 | struct task_struct *poll_task; | |
49 | }; | |
50 | ||
51 | static enum power_supply_property tps65217_ac_props[] = { | |
52 | POWER_SUPPLY_PROP_ONLINE, | |
53 | }; | |
54 | ||
55 | static int tps65217_config_charger(struct tps65217_charger *charger) | |
56 | { | |
57 | int ret; | |
58 | ||
59 | dev_dbg(charger->dev, "%s\n", __func__); | |
60 | ||
61 | /* | |
62 | * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic) | |
63 | * | |
64 | * The device can be configured to support a 100k NTC (B = 3960) by | |
65 | * setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it | |
66 | * is not recommended to do so. In sleep mode, the charger continues | |
67 | * charging the battery, but all register values are reset to default | |
68 | * values. Therefore, the charger would get the wrong temperature | |
69 | * information. If 100k NTC setting is required, please contact the | |
70 | * factory. | |
71 | * | |
72 | * ATTENTION, conflicting information, from p. 46 | |
73 | * | |
74 | * NTC TYPE (for battery temperature measurement) | |
75 | * 0 – 100k (curve 1, B = 3960) | |
76 | * 1 – 10k (curve 2, B = 3480) (default on reset) | |
77 | * | |
78 | */ | |
79 | ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1, | |
80 | TPS65217_CHGCONFIG1_NTC_TYPE, | |
81 | TPS65217_PROTECT_NONE); | |
82 | if (ret) { | |
83 | dev_err(charger->dev, | |
84 | "failed to set 100k NTC setting: %d\n", ret); | |
85 | return ret; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static int tps65217_enable_charging(struct tps65217_charger *charger) | |
92 | { | |
93 | int ret; | |
94 | ||
95 | /* charger already enabled */ | |
96 | if (charger->ac_online) | |
97 | return 0; | |
98 | ||
99 | dev_dbg(charger->dev, "%s: enable charging\n", __func__); | |
100 | ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1, | |
101 | TPS65217_CHGCONFIG1_CHG_EN, | |
102 | TPS65217_CHGCONFIG1_CHG_EN, | |
103 | TPS65217_PROTECT_NONE); | |
104 | if (ret) { | |
105 | dev_err(charger->dev, | |
106 | "%s: Error in writing CHG_EN in reg 0x%x: %d\n", | |
107 | __func__, TPS65217_REG_CHGCONFIG1, ret); | |
108 | return ret; | |
109 | } | |
110 | ||
111 | charger->ac_online = 1; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int tps65217_ac_get_property(struct power_supply *psy, | |
117 | enum power_supply_property psp, | |
118 | union power_supply_propval *val) | |
119 | { | |
120 | struct tps65217_charger *charger = power_supply_get_drvdata(psy); | |
121 | ||
122 | if (psp == POWER_SUPPLY_PROP_ONLINE) { | |
123 | val->intval = charger->ac_online; | |
124 | return 0; | |
125 | } | |
126 | return -EINVAL; | |
127 | } | |
128 | ||
129 | static irqreturn_t tps65217_charger_irq(int irq, void *dev) | |
130 | { | |
131 | int ret, val; | |
132 | struct tps65217_charger *charger = dev; | |
133 | ||
134 | charger->prev_ac_online = charger->ac_online; | |
135 | ||
136 | ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val); | |
137 | if (ret < 0) { | |
138 | dev_err(charger->dev, "%s: Error in reading reg 0x%x\n", | |
139 | __func__, TPS65217_REG_STATUS); | |
140 | return IRQ_HANDLED; | |
141 | } | |
142 | ||
143 | dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val); | |
144 | ||
145 | /* check for AC status bit */ | |
146 | if (val & TPS65217_STATUS_ACPWR) { | |
147 | ret = tps65217_enable_charging(charger); | |
148 | if (ret) { | |
149 | dev_err(charger->dev, | |
150 | "failed to enable charger: %d\n", ret); | |
151 | return IRQ_HANDLED; | |
152 | } | |
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 | ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val); | |
161 | if (ret < 0) { | |
162 | dev_err(charger->dev, "%s: Error in reading reg 0x%x\n", | |
163 | __func__, TPS65217_REG_CHGCONFIG0); | |
164 | return IRQ_HANDLED; | |
165 | } | |
166 | ||
167 | if (val & TPS65217_CHGCONFIG0_ACTIVE) | |
168 | dev_dbg(charger->dev, "%s: charger is charging\n", __func__); | |
169 | else | |
170 | dev_dbg(charger->dev, | |
171 | "%s: charger is NOT charging\n", __func__); | |
172 | ||
173 | return IRQ_HANDLED; | |
174 | } | |
175 | ||
176 | static int tps65217_charger_poll_task(void *data) | |
177 | { | |
178 | set_freezable(); | |
179 | ||
180 | while (!kthread_should_stop()) { | |
181 | schedule_timeout_interruptible(POLL_INTERVAL); | |
182 | try_to_freeze(); | |
183 | tps65217_charger_irq(-1, data); | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static const struct power_supply_desc tps65217_charger_desc = { | |
189 | .name = "tps65217-ac", | |
190 | .type = POWER_SUPPLY_TYPE_MAINS, | |
191 | .get_property = tps65217_ac_get_property, | |
192 | .properties = tps65217_ac_props, | |
193 | .num_properties = ARRAY_SIZE(tps65217_ac_props), | |
194 | }; | |
195 | ||
196 | static int tps65217_charger_probe(struct platform_device *pdev) | |
197 | { | |
198 | struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent); | |
199 | struct tps65217_charger *charger; | |
200 | int ret; | |
201 | ||
202 | dev_dbg(&pdev->dev, "%s\n", __func__); | |
203 | ||
204 | charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); | |
205 | if (!charger) | |
206 | return -ENOMEM; | |
207 | ||
208 | charger->tps = tps; | |
209 | charger->dev = &pdev->dev; | |
210 | ||
211 | charger->ac = devm_power_supply_register(&pdev->dev, | |
212 | &tps65217_charger_desc, | |
213 | NULL); | |
214 | if (IS_ERR(charger->ac)) { | |
215 | dev_err(&pdev->dev, "failed: power supply register\n"); | |
216 | return PTR_ERR(charger->ac); | |
217 | } | |
218 | ||
219 | ret = tps65217_config_charger(charger); | |
220 | if (ret < 0) { | |
221 | dev_err(charger->dev, "charger config failed, err %d\n", ret); | |
222 | return ret; | |
223 | } | |
224 | ||
225 | charger->poll_task = kthread_run(tps65217_charger_poll_task, | |
226 | charger, "ktps65217charger"); | |
227 | if (IS_ERR(charger->poll_task)) { | |
228 | ret = PTR_ERR(charger->poll_task); | |
229 | dev_err(charger->dev, "Unable to run kthread err %d\n", ret); | |
230 | return ret; | |
231 | } | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | static int tps65217_charger_remove(struct platform_device *pdev) | |
237 | { | |
238 | struct tps65217_charger *charger = platform_get_drvdata(pdev); | |
239 | ||
240 | kthread_stop(charger->poll_task); | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static const struct of_device_id tps65217_charger_match_table[] = { | |
246 | { .compatible = "ti,tps65217-charger", }, | |
247 | { /* sentinel */ } | |
248 | }; | |
249 | MODULE_DEVICE_TABLE(of, tps65217_charger_match_table); | |
250 | ||
251 | static struct platform_driver tps65217_charger_driver = { | |
252 | .probe = tps65217_charger_probe, | |
253 | .remove = tps65217_charger_remove, | |
254 | .driver = { | |
255 | .name = "tps65217-charger", | |
256 | .of_match_table = of_match_ptr(tps65217_charger_match_table), | |
257 | }, | |
258 | ||
259 | }; | |
260 | module_platform_driver(tps65217_charger_driver); | |
261 | ||
262 | MODULE_LICENSE("GPL v2"); | |
263 | MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>"); | |
264 | MODULE_DESCRIPTION("TPS65217 battery charger driver"); |