1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // Battery charger driver for TI's tps65217 |
3 | // |
4 | // Copyright (C) 2015 Collabora Ltd. |
5 | // Author: Enric Balletbo i Serra <enric.balletbo@collabora.com> |
6 | |
7 | /* |
8 | * Battery charger driver for TI's tps65217 |
9 | */ |
10 | #include <linux/kernel.h> |
11 | #include <linux/kthread.h> |
12 | #include <linux/device.h> |
13 | #include <linux/module.h> |
14 | #include <linux/platform_device.h> |
15 | #include <linux/init.h> |
16 | #include <linux/interrupt.h> |
17 | #include <linux/slab.h> |
18 | #include <linux/err.h> |
19 | #include <linux/of.h> |
20 | #include <linux/power_supply.h> |
21 | |
22 | #include <linux/mfd/core.h> |
23 | #include <linux/mfd/tps65217.h> |
24 | |
25 | #define CHARGER_STATUS_PRESENT (TPS65217_STATUS_ACPWR | TPS65217_STATUS_USBPWR) |
26 | #define NUM_CHARGER_IRQS 2 |
27 | #define POLL_INTERVAL (HZ * 2) |
28 | |
29 | struct tps65217_charger { |
30 | struct tps65217 *tps; |
31 | struct device *dev; |
32 | struct power_supply *psy; |
33 | |
34 | int online; |
35 | int prev_online; |
36 | |
37 | struct task_struct *poll_task; |
38 | }; |
39 | |
40 | static enum power_supply_property tps65217_charger_props[] = { |
41 | POWER_SUPPLY_PROP_ONLINE, |
42 | }; |
43 | |
44 | static int tps65217_config_charger(struct tps65217_charger *charger) |
45 | { |
46 | int ret; |
47 | |
48 | /* |
49 | * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic) |
50 | * |
51 | * The device can be configured to support a 100k NTC (B = 3960) by |
52 | * setting the NTC_TYPE bit in register CHGCONFIG1 to 1. However it |
53 | * is not recommended to do so. In sleep mode, the charger continues |
54 | * charging the battery, but all register values are reset to default |
55 | * values. Therefore, the charger would get the wrong temperature |
56 | * information. If 100k NTC setting is required, please contact the |
57 | * factory. |
58 | * |
59 | * ATTENTION, conflicting information, from p. 46 |
60 | * |
61 | * NTC TYPE (for battery temperature measurement) |
62 | * 0 – 100k (curve 1, B = 3960) |
63 | * 1 – 10k (curve 2, B = 3480) (default on reset) |
64 | * |
65 | */ |
66 | ret = tps65217_clear_bits(tps: charger->tps, TPS65217_REG_CHGCONFIG1, |
67 | TPS65217_CHGCONFIG1_NTC_TYPE, |
68 | TPS65217_PROTECT_NONE); |
69 | if (ret) { |
70 | dev_err(charger->dev, |
71 | "failed to set 100k NTC setting: %d\n" , ret); |
72 | return ret; |
73 | } |
74 | |
75 | return 0; |
76 | } |
77 | |
78 | static int tps65217_enable_charging(struct tps65217_charger *charger) |
79 | { |
80 | int ret; |
81 | |
82 | /* charger already enabled */ |
83 | if (charger->online) |
84 | return 0; |
85 | |
86 | dev_dbg(charger->dev, "%s: enable charging\n" , __func__); |
87 | ret = tps65217_set_bits(tps: charger->tps, TPS65217_REG_CHGCONFIG1, |
88 | TPS65217_CHGCONFIG1_CHG_EN, |
89 | TPS65217_CHGCONFIG1_CHG_EN, |
90 | TPS65217_PROTECT_NONE); |
91 | if (ret) { |
92 | dev_err(charger->dev, |
93 | "%s: Error in writing CHG_EN in reg 0x%x: %d\n" , |
94 | __func__, TPS65217_REG_CHGCONFIG1, ret); |
95 | return ret; |
96 | } |
97 | |
98 | charger->online = 1; |
99 | |
100 | return 0; |
101 | } |
102 | |
103 | static int tps65217_charger_get_property(struct power_supply *psy, |
104 | enum power_supply_property psp, |
105 | union power_supply_propval *val) |
106 | { |
107 | struct tps65217_charger *charger = power_supply_get_drvdata(psy); |
108 | |
109 | if (psp == POWER_SUPPLY_PROP_ONLINE) { |
110 | val->intval = charger->online; |
111 | return 0; |
112 | } |
113 | return -EINVAL; |
114 | } |
115 | |
116 | static irqreturn_t tps65217_charger_irq(int irq, void *dev) |
117 | { |
118 | int ret, val; |
119 | struct tps65217_charger *charger = dev; |
120 | |
121 | charger->prev_online = charger->online; |
122 | |
123 | ret = tps65217_reg_read(tps: charger->tps, TPS65217_REG_STATUS, val: &val); |
124 | if (ret < 0) { |
125 | dev_err(charger->dev, "%s: Error in reading reg 0x%x\n" , |
126 | __func__, TPS65217_REG_STATUS); |
127 | return IRQ_HANDLED; |
128 | } |
129 | |
130 | dev_dbg(charger->dev, "%s: 0x%x\n" , __func__, val); |
131 | |
132 | /* check for charger status bit */ |
133 | if (val & CHARGER_STATUS_PRESENT) { |
134 | ret = tps65217_enable_charging(charger); |
135 | if (ret) { |
136 | dev_err(charger->dev, |
137 | "failed to enable charger: %d\n" , ret); |
138 | return IRQ_HANDLED; |
139 | } |
140 | } else { |
141 | charger->online = 0; |
142 | } |
143 | |
144 | if (charger->prev_online != charger->online) |
145 | power_supply_changed(psy: charger->psy); |
146 | |
147 | ret = tps65217_reg_read(tps: charger->tps, TPS65217_REG_CHGCONFIG0, val: &val); |
148 | if (ret < 0) { |
149 | dev_err(charger->dev, "%s: Error in reading reg 0x%x\n" , |
150 | __func__, TPS65217_REG_CHGCONFIG0); |
151 | return IRQ_HANDLED; |
152 | } |
153 | |
154 | if (val & TPS65217_CHGCONFIG0_ACTIVE) |
155 | dev_dbg(charger->dev, "%s: charger is charging\n" , __func__); |
156 | else |
157 | dev_dbg(charger->dev, |
158 | "%s: charger is NOT charging\n" , __func__); |
159 | |
160 | return IRQ_HANDLED; |
161 | } |
162 | |
163 | static int tps65217_charger_poll_task(void *data) |
164 | { |
165 | set_freezable(); |
166 | |
167 | while (!kthread_should_stop()) { |
168 | schedule_timeout_interruptible(POLL_INTERVAL); |
169 | try_to_freeze(); |
170 | tps65217_charger_irq(irq: -1, dev: data); |
171 | } |
172 | return 0; |
173 | } |
174 | |
175 | static const struct power_supply_desc tps65217_charger_desc = { |
176 | .name = "tps65217-charger" , |
177 | .type = POWER_SUPPLY_TYPE_MAINS, |
178 | .get_property = tps65217_charger_get_property, |
179 | .properties = tps65217_charger_props, |
180 | .num_properties = ARRAY_SIZE(tps65217_charger_props), |
181 | }; |
182 | |
183 | static int tps65217_charger_probe(struct platform_device *pdev) |
184 | { |
185 | struct tps65217 *tps = dev_get_drvdata(dev: pdev->dev.parent); |
186 | struct tps65217_charger *charger; |
187 | struct power_supply_config cfg = {}; |
188 | struct task_struct *poll_task; |
189 | int irq[NUM_CHARGER_IRQS]; |
190 | int ret; |
191 | int i; |
192 | |
193 | charger = devm_kzalloc(dev: &pdev->dev, size: sizeof(*charger), GFP_KERNEL); |
194 | if (!charger) |
195 | return -ENOMEM; |
196 | |
197 | platform_set_drvdata(pdev, data: charger); |
198 | charger->tps = tps; |
199 | charger->dev = &pdev->dev; |
200 | |
201 | cfg.of_node = pdev->dev.of_node; |
202 | cfg.drv_data = charger; |
203 | |
204 | charger->psy = devm_power_supply_register(parent: &pdev->dev, |
205 | desc: &tps65217_charger_desc, |
206 | cfg: &cfg); |
207 | if (IS_ERR(ptr: charger->psy)) { |
208 | dev_err(&pdev->dev, "failed: power supply register\n" ); |
209 | return PTR_ERR(ptr: charger->psy); |
210 | } |
211 | |
212 | irq[0] = platform_get_irq_byname(pdev, "USB" ); |
213 | irq[1] = platform_get_irq_byname(pdev, "AC" ); |
214 | |
215 | ret = tps65217_config_charger(charger); |
216 | if (ret < 0) { |
217 | dev_err(charger->dev, "charger config failed, err %d\n" , ret); |
218 | return ret; |
219 | } |
220 | |
221 | /* Create a polling thread if an interrupt is invalid */ |
222 | if (irq[0] < 0 || irq[1] < 0) { |
223 | poll_task = kthread_run(tps65217_charger_poll_task, |
224 | charger, "ktps65217charger" ); |
225 | if (IS_ERR(ptr: poll_task)) { |
226 | ret = PTR_ERR(ptr: poll_task); |
227 | dev_err(charger->dev, |
228 | "Unable to run kthread err %d\n" , ret); |
229 | return ret; |
230 | } |
231 | |
232 | charger->poll_task = poll_task; |
233 | return 0; |
234 | } |
235 | |
236 | /* Create IRQ threads for charger interrupts */ |
237 | for (i = 0; i < NUM_CHARGER_IRQS; i++) { |
238 | ret = devm_request_threaded_irq(dev: &pdev->dev, irq: irq[i], NULL, |
239 | thread_fn: tps65217_charger_irq, |
240 | IRQF_SHARED, devname: "tps65217-charger" , |
241 | dev_id: charger); |
242 | if (ret) { |
243 | dev_err(charger->dev, |
244 | "Unable to register irq %d err %d\n" , irq[i], |
245 | ret); |
246 | return ret; |
247 | } |
248 | |
249 | /* Check current state */ |
250 | tps65217_charger_irq(irq: -1, dev: charger); |
251 | } |
252 | |
253 | return 0; |
254 | } |
255 | |
256 | static void tps65217_charger_remove(struct platform_device *pdev) |
257 | { |
258 | struct tps65217_charger *charger = platform_get_drvdata(pdev); |
259 | |
260 | if (charger->poll_task) |
261 | kthread_stop(k: charger->poll_task); |
262 | } |
263 | |
264 | static const struct of_device_id tps65217_charger_match_table[] = { |
265 | { .compatible = "ti,tps65217-charger" , }, |
266 | { /* sentinel */ } |
267 | }; |
268 | MODULE_DEVICE_TABLE(of, tps65217_charger_match_table); |
269 | |
270 | static struct platform_driver tps65217_charger_driver = { |
271 | .probe = tps65217_charger_probe, |
272 | .remove_new = tps65217_charger_remove, |
273 | .driver = { |
274 | .name = "tps65217-charger" , |
275 | .of_match_table = of_match_ptr(tps65217_charger_match_table), |
276 | }, |
277 | |
278 | }; |
279 | module_platform_driver(tps65217_charger_driver); |
280 | |
281 | MODULE_LICENSE("GPL v2" ); |
282 | MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>" ); |
283 | MODULE_DESCRIPTION("TPS65217 battery charger driver" ); |
284 | |