1 // SPDX-License-Identifier: GPL-2.0-only
3 * LP8755 High Performance Power Management Unit : System Interface Driver
5 * Copyright 2012 Texas Instruments
10 #include <linux/module.h>
11 #include <linux/slab.h>
12 #include <linux/i2c.h>
13 #include <linux/err.h>
14 #include <linux/irq.h>
15 #include <linux/interrupt.h>
16 #include <linux/gpio.h>
17 #include <linux/regmap.h>
18 #include <linux/uaccess.h>
19 #include <linux/regulator/driver.h>
20 #include <linux/regulator/machine.h>
21 #include <linux/platform_data/lp8755.h>
23 #define LP8755_REG_BUCK0 0x00
24 #define LP8755_REG_BUCK1 0x03
25 #define LP8755_REG_BUCK2 0x04
26 #define LP8755_REG_BUCK3 0x01
27 #define LP8755_REG_BUCK4 0x05
28 #define LP8755_REG_BUCK5 0x02
29 #define LP8755_REG_MAX 0xFF
31 #define LP8755_BUCK_EN_M BIT(7)
32 #define LP8755_BUCK_LINEAR_OUT_MAX 0x76
33 #define LP8755_BUCK_VOUT_M 0x7F
35 struct lp8755_mphase {
37 int buck_num[LP8755_BUCK_MAX];
42 struct regmap *regmap;
43 struct lp8755_platform_data *pdata;
49 struct regulator_dev *rdev[LP8755_BUCK_MAX];
52 static int lp8755_buck_enable_time(struct regulator_dev *rdev)
56 enum lp8755_bucks id = rdev_get_id(rdev);
58 ret = regmap_read(rdev->regmap, 0x12 + id, ®val);
60 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
63 return (regval & 0xff) * 100;
66 static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
69 unsigned int regbval = 0x0;
70 enum lp8755_bucks id = rdev_get_id(rdev);
71 struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
74 case REGULATOR_MODE_FAST:
76 regbval = (0x01 << id);
78 case REGULATOR_MODE_NORMAL:
79 /* enable automatic pwm/pfm mode */
80 ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x00);
84 case REGULATOR_MODE_IDLE:
85 /* enable automatic pwm/pfm/lppfm mode */
86 ret = regmap_update_bits(rdev->regmap, 0x08 + id, 0x20, 0x20);
90 ret = regmap_update_bits(rdev->regmap, 0x10, 0x01, 0x01);
95 dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
97 regbval = (0x01 << id);
100 ret = regmap_update_bits(rdev->regmap, 0x06, 0x01 << id, regbval);
105 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
109 static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
113 enum lp8755_bucks id = rdev_get_id(rdev);
115 ret = regmap_read(rdev->regmap, 0x06, ®val);
119 /* mode fast means forced pwm mode */
120 if (regval & (0x01 << id))
121 return REGULATOR_MODE_FAST;
123 ret = regmap_read(rdev->regmap, 0x08 + id, ®val);
127 /* mode idle means automatic pwm/pfm/lppfm mode */
129 return REGULATOR_MODE_IDLE;
131 /* mode normal means automatic pwm/pfm mode */
132 return REGULATOR_MODE_NORMAL;
135 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
139 static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
142 unsigned int regval = 0x00;
143 enum lp8755_bucks id = rdev_get_id(rdev);
168 case 15001 ... 30000:
173 "Not supported ramp value %d %s\n", ramp, __func__);
177 ret = regmap_update_bits(rdev->regmap, 0x07 + id, 0x07, regval);
182 dev_err(&rdev->dev, "i2c access error %s\n", __func__);
186 static const struct regulator_ops lp8755_buck_ops = {
187 .map_voltage = regulator_map_voltage_linear,
188 .list_voltage = regulator_list_voltage_linear,
189 .set_voltage_sel = regulator_set_voltage_sel_regmap,
190 .get_voltage_sel = regulator_get_voltage_sel_regmap,
191 .enable = regulator_enable_regmap,
192 .disable = regulator_disable_regmap,
193 .is_enabled = regulator_is_enabled_regmap,
194 .enable_time = lp8755_buck_enable_time,
195 .set_mode = lp8755_buck_set_mode,
196 .get_mode = lp8755_buck_get_mode,
197 .set_ramp_delay = lp8755_buck_set_ramp,
200 #define lp8755_rail(_id) "lp8755_buck"#_id
201 #define lp8755_buck_init(_id)\
204 .name = lp8755_rail(_id),\
205 .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
211 static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
212 [LP8755_BUCK0] = lp8755_buck_init(0),
213 [LP8755_BUCK1] = lp8755_buck_init(1),
214 [LP8755_BUCK2] = lp8755_buck_init(2),
215 [LP8755_BUCK3] = lp8755_buck_init(3),
216 [LP8755_BUCK4] = lp8755_buck_init(4),
217 [LP8755_BUCK5] = lp8755_buck_init(5),
220 static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
221 { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
222 { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
223 LP8755_BUCK4, LP8755_BUCK5 } },
224 { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
226 { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
227 { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
228 { 2, { LP8755_BUCK0, LP8755_BUCK5} },
229 { 1, { LP8755_BUCK0} },
230 { 2, { LP8755_BUCK0, LP8755_BUCK3} },
231 { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
234 static int lp8755_init_data(struct lp8755_chip *pchip)
237 int ret, icnt, buck_num;
238 struct lp8755_platform_data *pdata = pchip->pdata;
240 /* read back muti-phase configuration */
241 ret = regmap_read(pchip->regmap, 0x3D, ®val);
244 pchip->mphase = regval & 0x0F;
246 /* set default data based on multi-phase config */
247 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
248 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
249 pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
254 dev_err(pchip->dev, "i2c access error %s\n", __func__);
258 #define lp8755_buck_desc(_id)\
260 .name = lp8755_rail(_id),\
261 .id = LP8755_BUCK##_id,\
262 .ops = &lp8755_buck_ops,\
263 .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
266 .type = REGULATOR_VOLTAGE,\
267 .owner = THIS_MODULE,\
268 .enable_reg = LP8755_REG_BUCK##_id,\
269 .enable_mask = LP8755_BUCK_EN_M,\
270 .vsel_reg = LP8755_REG_BUCK##_id,\
271 .vsel_mask = LP8755_BUCK_VOUT_M,\
274 static const struct regulator_desc lp8755_regulators[] = {
283 static int lp8755_regulator_init(struct lp8755_chip *pchip)
285 int ret, icnt, buck_num;
286 struct lp8755_platform_data *pdata = pchip->pdata;
287 struct regulator_config rconfig = { };
289 rconfig.regmap = pchip->regmap;
290 rconfig.dev = pchip->dev;
291 rconfig.driver_data = pchip;
293 for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
294 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
295 rconfig.init_data = pdata->buck_data[buck_num];
296 rconfig.of_node = pchip->dev->of_node;
297 pchip->rdev[buck_num] =
298 devm_regulator_register(pchip->dev,
299 &lp8755_regulators[buck_num], &rconfig);
300 if (IS_ERR(pchip->rdev[buck_num])) {
301 ret = PTR_ERR(pchip->rdev[buck_num]);
302 pchip->rdev[buck_num] = NULL;
303 dev_err(pchip->dev, "regulator init failed: buck %d\n",
312 static irqreturn_t lp8755_irq_handler(int irq, void *data)
315 unsigned int flag0, flag1;
316 struct lp8755_chip *pchip = data;
318 /* read flag0 register */
319 ret = regmap_read(pchip->regmap, 0x0D, &flag0);
322 /* clear flag register to pull up int. pin */
323 ret = regmap_write(pchip->regmap, 0x0D, 0x00);
327 /* sent power fault detection event to specific regulator */
328 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
329 if ((flag0 & (0x4 << icnt))
330 && (pchip->irqmask & (0x04 << icnt))
331 && (pchip->rdev[icnt] != NULL)) {
332 regulator_notifier_call_chain(pchip->rdev[icnt],
333 LP8755_EVENT_PWR_FAULT,
337 /* read flag1 register */
338 ret = regmap_read(pchip->regmap, 0x0E, &flag1);
341 /* clear flag register to pull up int. pin */
342 ret = regmap_write(pchip->regmap, 0x0E, 0x00);
346 /* send OCP event to all regulator devices */
347 if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
348 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
349 if (pchip->rdev[icnt] != NULL) {
350 regulator_notifier_call_chain(pchip->rdev[icnt],
355 /* send OVP event to all regulator devices */
356 if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
357 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
358 if (pchip->rdev[icnt] != NULL) {
359 regulator_notifier_call_chain(pchip->rdev[icnt],
366 dev_err(pchip->dev, "i2c access error %s\n", __func__);
370 static int lp8755_int_config(struct lp8755_chip *pchip)
375 if (pchip->irq == 0) {
376 dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
380 ret = regmap_read(pchip->regmap, 0x0F, ®val);
382 dev_err(pchip->dev, "i2c access error %s\n", __func__);
386 pchip->irqmask = regval;
387 return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
389 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
390 "lp8755-irq", pchip);
393 static const struct regmap_config lp8755_regmap = {
396 .max_register = LP8755_REG_MAX,
399 static int lp8755_probe(struct i2c_client *client,
400 const struct i2c_device_id *id)
403 struct lp8755_chip *pchip;
404 struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
406 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
407 dev_err(&client->dev, "i2c functionality check fail.\n");
411 pchip = devm_kzalloc(&client->dev,
412 sizeof(struct lp8755_chip), GFP_KERNEL);
416 pchip->dev = &client->dev;
417 pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
418 if (IS_ERR(pchip->regmap)) {
419 ret = PTR_ERR(pchip->regmap);
420 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
423 i2c_set_clientdata(client, pchip);
426 pchip->pdata = pdata;
427 pchip->mphase = pdata->mphase;
429 pchip->pdata = devm_kzalloc(pchip->dev,
430 sizeof(struct lp8755_platform_data),
434 ret = lp8755_init_data(pchip);
436 dev_err(&client->dev, "fail to initialize chip\n");
441 ret = lp8755_regulator_init(pchip);
443 dev_err(&client->dev, "fail to initialize regulators\n");
447 pchip->irq = client->irq;
448 ret = lp8755_int_config(pchip);
450 dev_err(&client->dev, "fail to irq config\n");
458 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
459 regmap_write(pchip->regmap, icnt, 0x00);
464 static int lp8755_remove(struct i2c_client *client)
467 struct lp8755_chip *pchip = i2c_get_clientdata(client);
469 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
470 regmap_write(pchip->regmap, icnt, 0x00);
475 static const struct i2c_device_id lp8755_id[] = {
480 MODULE_DEVICE_TABLE(i2c, lp8755_id);
482 static struct i2c_driver lp8755_i2c_driver = {
486 .probe = lp8755_probe,
487 .remove = lp8755_remove,
488 .id_table = lp8755_id,
491 static int __init lp8755_init(void)
493 return i2c_add_driver(&lp8755_i2c_driver);
496 subsys_initcall(lp8755_init);
498 static void __exit lp8755_exit(void)
500 i2c_del_driver(&lp8755_i2c_driver);
503 module_exit(lp8755_exit);
505 MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
507 MODULE_LICENSE("GPL v2");