2 * Battery charger driver for TI's tps65217
4 * Copyright (c) 2015, Collabora Ltd.
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.
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
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/>.
20 * Battery charger driver for TI's tps65217
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>
32 #include <linux/of_device.h>
33 #include <linux/power_supply.h>
35 #include <linux/mfd/core.h>
36 #include <linux/mfd/tps65217.h>
38 #define CHARGER_STATUS_PRESENT (TPS65217_STATUS_ACPWR | TPS65217_STATUS_USBPWR)
39 #define NUM_CHARGER_IRQS 2
40 #define POLL_INTERVAL (HZ * 2)
42 struct tps65217_charger {
45 struct power_supply *psy;
50 struct task_struct *poll_task;
53 static enum power_supply_property tps65217_charger_props[] = {
54 POWER_SUPPLY_PROP_ONLINE,
57 static int tps65217_config_charger(struct tps65217_charger *charger)
61 dev_dbg(charger->dev, "%s\n", __func__);
64 * tps65217 rev. G, p. 31 (see p. 32 for NTC schematic)
66 * The device can be configured to support a 100k NTC (B = 3960) by
67 * setting the the NTC_TYPE bit in register CHGCONFIG1 to 1. However it
68 * is not recommended to do so. In sleep mode, the charger continues
69 * charging the battery, but all register values are reset to default
70 * values. Therefore, the charger would get the wrong temperature
71 * information. If 100k NTC setting is required, please contact the
74 * ATTENTION, conflicting information, from p. 46
76 * NTC TYPE (for battery temperature measurement)
77 * 0 – 100k (curve 1, B = 3960)
78 * 1 – 10k (curve 2, B = 3480) (default on reset)
81 ret = tps65217_clear_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
82 TPS65217_CHGCONFIG1_NTC_TYPE,
83 TPS65217_PROTECT_NONE);
86 "failed to set 100k NTC setting: %d\n", ret);
93 static int tps65217_enable_charging(struct tps65217_charger *charger)
97 /* charger already enabled */
101 dev_dbg(charger->dev, "%s: enable charging\n", __func__);
102 ret = tps65217_set_bits(charger->tps, TPS65217_REG_CHGCONFIG1,
103 TPS65217_CHGCONFIG1_CHG_EN,
104 TPS65217_CHGCONFIG1_CHG_EN,
105 TPS65217_PROTECT_NONE);
107 dev_err(charger->dev,
108 "%s: Error in writing CHG_EN in reg 0x%x: %d\n",
109 __func__, TPS65217_REG_CHGCONFIG1, ret);
118 static int tps65217_charger_get_property(struct power_supply *psy,
119 enum power_supply_property psp,
120 union power_supply_propval *val)
122 struct tps65217_charger *charger = power_supply_get_drvdata(psy);
124 if (psp == POWER_SUPPLY_PROP_ONLINE) {
125 val->intval = charger->online;
131 static irqreturn_t tps65217_charger_irq(int irq, void *dev)
134 struct tps65217_charger *charger = dev;
136 charger->prev_online = charger->online;
138 ret = tps65217_reg_read(charger->tps, TPS65217_REG_STATUS, &val);
140 dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
141 __func__, TPS65217_REG_STATUS);
145 dev_dbg(charger->dev, "%s: 0x%x\n", __func__, val);
147 /* check for charger status bit */
148 if (val & CHARGER_STATUS_PRESENT) {
149 ret = tps65217_enable_charging(charger);
151 dev_err(charger->dev,
152 "failed to enable charger: %d\n", ret);
159 if (charger->prev_online != charger->online)
160 power_supply_changed(charger->psy);
162 ret = tps65217_reg_read(charger->tps, TPS65217_REG_CHGCONFIG0, &val);
164 dev_err(charger->dev, "%s: Error in reading reg 0x%x\n",
165 __func__, TPS65217_REG_CHGCONFIG0);
169 if (val & TPS65217_CHGCONFIG0_ACTIVE)
170 dev_dbg(charger->dev, "%s: charger is charging\n", __func__);
172 dev_dbg(charger->dev,
173 "%s: charger is NOT charging\n", __func__);
178 static int tps65217_charger_poll_task(void *data)
182 while (!kthread_should_stop()) {
183 schedule_timeout_interruptible(POLL_INTERVAL);
185 tps65217_charger_irq(-1, data);
190 static const struct power_supply_desc tps65217_charger_desc = {
191 .name = "tps65217-charger",
192 .type = POWER_SUPPLY_TYPE_MAINS,
193 .get_property = tps65217_charger_get_property,
194 .properties = tps65217_charger_props,
195 .num_properties = ARRAY_SIZE(tps65217_charger_props),
198 static int tps65217_charger_probe(struct platform_device *pdev)
200 struct tps65217 *tps = dev_get_drvdata(pdev->dev.parent);
201 struct tps65217_charger *charger;
202 struct power_supply_config cfg = {};
203 struct task_struct *poll_task;
204 int irq[NUM_CHARGER_IRQS];
208 dev_dbg(&pdev->dev, "%s\n", __func__);
210 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
214 platform_set_drvdata(pdev, charger);
216 charger->dev = &pdev->dev;
218 cfg.of_node = pdev->dev.of_node;
219 cfg.drv_data = charger;
221 charger->psy = devm_power_supply_register(&pdev->dev,
222 &tps65217_charger_desc,
224 if (IS_ERR(charger->psy)) {
225 dev_err(&pdev->dev, "failed: power supply register\n");
226 return PTR_ERR(charger->psy);
229 irq[0] = platform_get_irq_byname(pdev, "USB");
230 irq[1] = platform_get_irq_byname(pdev, "AC");
232 ret = tps65217_config_charger(charger);
234 dev_err(charger->dev, "charger config failed, err %d\n", ret);
238 /* Create a polling thread if an interrupt is invalid */
239 if (irq[0] < 0 || irq[1] < 0) {
240 poll_task = kthread_run(tps65217_charger_poll_task,
241 charger, "ktps65217charger");
242 if (IS_ERR(poll_task)) {
243 ret = PTR_ERR(poll_task);
244 dev_err(charger->dev,
245 "Unable to run kthread err %d\n", ret);
249 charger->poll_task = poll_task;
253 /* Create IRQ threads for charger interrupts */
254 for (i = 0; i < NUM_CHARGER_IRQS; i++) {
255 ret = devm_request_threaded_irq(&pdev->dev, irq[i], NULL,
256 tps65217_charger_irq,
257 0, "tps65217-charger",
260 dev_err(charger->dev,
261 "Unable to register irq %d err %d\n", irq[i],
266 /* Check current state */
267 tps65217_charger_irq(-1, charger);
273 static int tps65217_charger_remove(struct platform_device *pdev)
275 struct tps65217_charger *charger = platform_get_drvdata(pdev);
277 if (charger->poll_task)
278 kthread_stop(charger->poll_task);
283 static const struct of_device_id tps65217_charger_match_table[] = {
284 { .compatible = "ti,tps65217-charger", },
287 MODULE_DEVICE_TABLE(of, tps65217_charger_match_table);
289 static struct platform_driver tps65217_charger_driver = {
290 .probe = tps65217_charger_probe,
291 .remove = tps65217_charger_remove,
293 .name = "tps65217-charger",
294 .of_match_table = of_match_ptr(tps65217_charger_match_table),
298 module_platform_driver(tps65217_charger_driver);
300 MODULE_LICENSE("GPL v2");
301 MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
302 MODULE_DESCRIPTION("TPS65217 battery charger driver");