1fd2f02f9SAxel Lin // SPDX-License-Identifier: GPL-2.0+
2fd2f02f9SAxel Lin //
3fd2f02f9SAxel Lin // da9210-regulator.c - Regulator device driver for DA9210
4fd2f02f9SAxel Lin // Copyright (C) 2013 Dialog Semiconductor Ltd.
516f10918SSteve Twiss
616f10918SSteve Twiss #include <linux/err.h>
716f10918SSteve Twiss #include <linux/i2c.h>
816f10918SSteve Twiss #include <linux/module.h>
942457460SGeert Uytterhoeven #include <linux/interrupt.h>
1042457460SGeert Uytterhoeven #include <linux/irq.h>
1116f10918SSteve Twiss #include <linux/regulator/driver.h>
1216f10918SSteve Twiss #include <linux/regulator/machine.h>
132d0cf04cSSteve Twiss #include <linux/of_device.h>
14937433c2SGuennadi Liakhovetski #include <linux/regulator/of_regulator.h>
1516f10918SSteve Twiss #include <linux/regmap.h>
1616f10918SSteve Twiss
1716f10918SSteve Twiss #include "da9210-regulator.h"
1816f10918SSteve Twiss
1916f10918SSteve Twiss struct da9210 {
2016f10918SSteve Twiss struct regulator_dev *rdev;
2116f10918SSteve Twiss struct regmap *regmap;
2216f10918SSteve Twiss };
2316f10918SSteve Twiss
2416f10918SSteve Twiss static const struct regmap_config da9210_regmap_config = {
2516f10918SSteve Twiss .reg_bits = 8,
2616f10918SSteve Twiss .val_bits = 8,
2716f10918SSteve Twiss };
2816f10918SSteve Twiss
2971242b49SJulia Lawall static const struct regulator_ops da9210_buck_ops = {
3016f10918SSteve Twiss .enable = regulator_enable_regmap,
3116f10918SSteve Twiss .disable = regulator_disable_regmap,
3216f10918SSteve Twiss .is_enabled = regulator_is_enabled_regmap,
3316f10918SSteve Twiss .set_voltage_sel = regulator_set_voltage_sel_regmap,
3416f10918SSteve Twiss .get_voltage_sel = regulator_get_voltage_sel_regmap,
3516f10918SSteve Twiss .list_voltage = regulator_list_voltage_linear,
368b3216c4SAxel Lin .set_current_limit = regulator_set_current_limit_regmap,
378b3216c4SAxel Lin .get_current_limit = regulator_get_current_limit_regmap,
3816f10918SSteve Twiss };
3916f10918SSteve Twiss
4016f10918SSteve Twiss /* Default limits measured in millivolts and milliamps */
4116f10918SSteve Twiss #define DA9210_MIN_MV 300
4216f10918SSteve Twiss #define DA9210_MAX_MV 1570
4316f10918SSteve Twiss #define DA9210_STEP_MV 10
4416f10918SSteve Twiss
4516f10918SSteve Twiss /* Current limits for buck (uA) indices corresponds with register values */
468b3216c4SAxel Lin static const unsigned int da9210_buck_limits[] = {
4716f10918SSteve Twiss 1600000, 1800000, 2000000, 2200000, 2400000, 2600000, 2800000, 3000000,
4816f10918SSteve Twiss 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000
4916f10918SSteve Twiss };
5016f10918SSteve Twiss
5116f10918SSteve Twiss static const struct regulator_desc da9210_reg = {
5216f10918SSteve Twiss .name = "DA9210",
5316f10918SSteve Twiss .id = 0,
5416f10918SSteve Twiss .ops = &da9210_buck_ops,
5516f10918SSteve Twiss .type = REGULATOR_VOLTAGE,
5616f10918SSteve Twiss .n_voltages = ((DA9210_MAX_MV - DA9210_MIN_MV) / DA9210_STEP_MV) + 1,
5716f10918SSteve Twiss .min_uV = (DA9210_MIN_MV * 1000),
5816f10918SSteve Twiss .uV_step = (DA9210_STEP_MV * 1000),
5916f10918SSteve Twiss .vsel_reg = DA9210_REG_VBUCK_A,
6016f10918SSteve Twiss .vsel_mask = DA9210_VBUCK_MASK,
6116f10918SSteve Twiss .enable_reg = DA9210_REG_BUCK_CONT,
6216f10918SSteve Twiss .enable_mask = DA9210_BUCK_EN,
6316f10918SSteve Twiss .owner = THIS_MODULE,
648b3216c4SAxel Lin .curr_table = da9210_buck_limits,
658b3216c4SAxel Lin .n_current_limits = ARRAY_SIZE(da9210_buck_limits),
668b3216c4SAxel Lin .csel_reg = DA9210_REG_BUCK_ILIM,
678b3216c4SAxel Lin .csel_mask = DA9210_BUCK_ILIM_MASK,
6816f10918SSteve Twiss };
6916f10918SSteve Twiss
da9210_irq_handler(int irq,void * data)7042457460SGeert Uytterhoeven static irqreturn_t da9210_irq_handler(int irq, void *data)
7142457460SGeert Uytterhoeven {
7242457460SGeert Uytterhoeven struct da9210 *chip = data;
7342457460SGeert Uytterhoeven unsigned int val, handled = 0;
7442457460SGeert Uytterhoeven int error, ret = IRQ_NONE;
7542457460SGeert Uytterhoeven
7642457460SGeert Uytterhoeven error = regmap_read(chip->regmap, DA9210_REG_EVENT_B, &val);
7742457460SGeert Uytterhoeven if (error < 0)
7842457460SGeert Uytterhoeven goto error_i2c;
7942457460SGeert Uytterhoeven
8042457460SGeert Uytterhoeven if (val & DA9210_E_OVCURR) {
8142457460SGeert Uytterhoeven regulator_notifier_call_chain(chip->rdev,
8242457460SGeert Uytterhoeven REGULATOR_EVENT_OVER_CURRENT,
8342457460SGeert Uytterhoeven NULL);
8442457460SGeert Uytterhoeven handled |= DA9210_E_OVCURR;
8542457460SGeert Uytterhoeven }
8642457460SGeert Uytterhoeven if (val & DA9210_E_NPWRGOOD) {
8742457460SGeert Uytterhoeven regulator_notifier_call_chain(chip->rdev,
8842457460SGeert Uytterhoeven REGULATOR_EVENT_UNDER_VOLTAGE,
8942457460SGeert Uytterhoeven NULL);
9042457460SGeert Uytterhoeven handled |= DA9210_E_NPWRGOOD;
9142457460SGeert Uytterhoeven }
9242457460SGeert Uytterhoeven if (val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT)) {
9342457460SGeert Uytterhoeven regulator_notifier_call_chain(chip->rdev,
9442457460SGeert Uytterhoeven REGULATOR_EVENT_OVER_TEMP, NULL);
9542457460SGeert Uytterhoeven handled |= val & (DA9210_E_TEMP_WARN | DA9210_E_TEMP_CRIT);
9642457460SGeert Uytterhoeven }
9742457460SGeert Uytterhoeven if (val & DA9210_E_VMAX) {
9842457460SGeert Uytterhoeven regulator_notifier_call_chain(chip->rdev,
9942457460SGeert Uytterhoeven REGULATOR_EVENT_REGULATION_OUT,
10042457460SGeert Uytterhoeven NULL);
10142457460SGeert Uytterhoeven handled |= DA9210_E_VMAX;
10242457460SGeert Uytterhoeven }
1030f48eedaSWolfram Sang
10442457460SGeert Uytterhoeven if (handled) {
10542457460SGeert Uytterhoeven /* Clear handled events */
10642457460SGeert Uytterhoeven error = regmap_write(chip->regmap, DA9210_REG_EVENT_B, handled);
10742457460SGeert Uytterhoeven if (error < 0)
10842457460SGeert Uytterhoeven goto error_i2c;
10942457460SGeert Uytterhoeven
11042457460SGeert Uytterhoeven ret = IRQ_HANDLED;
11142457460SGeert Uytterhoeven }
11242457460SGeert Uytterhoeven
11342457460SGeert Uytterhoeven return ret;
11442457460SGeert Uytterhoeven
11542457460SGeert Uytterhoeven error_i2c:
11642457460SGeert Uytterhoeven dev_err(regmap_get_device(chip->regmap), "I2C error : %d\n", error);
11742457460SGeert Uytterhoeven return ret;
11842457460SGeert Uytterhoeven }
11942457460SGeert Uytterhoeven
12016f10918SSteve Twiss /*
12116f10918SSteve Twiss * I2C driver interface functions
12216f10918SSteve Twiss */
1232d0cf04cSSteve Twiss
1242d2a84aeSJisheng Zhang static const struct of_device_id __maybe_unused da9210_dt_ids[] = {
1252d0cf04cSSteve Twiss { .compatible = "dlg,da9210", },
1262d0cf04cSSteve Twiss { }
1272d0cf04cSSteve Twiss };
1282d0cf04cSSteve Twiss MODULE_DEVICE_TABLE(of, da9210_dt_ids);
1292d0cf04cSSteve Twiss
da9210_i2c_probe(struct i2c_client * i2c)13077e29598SAxel Lin static int da9210_i2c_probe(struct i2c_client *i2c)
13116f10918SSteve Twiss {
13216f10918SSteve Twiss struct da9210 *chip;
133937433c2SGuennadi Liakhovetski struct device *dev = &i2c->dev;
134937433c2SGuennadi Liakhovetski struct da9210_pdata *pdata = dev_get_platdata(dev);
13516f10918SSteve Twiss struct regulator_dev *rdev = NULL;
13616f10918SSteve Twiss struct regulator_config config = { };
13716f10918SSteve Twiss int error;
1382d0cf04cSSteve Twiss const struct of_device_id *match;
1392d0cf04cSSteve Twiss
1402d0cf04cSSteve Twiss if (i2c->dev.of_node && !pdata) {
1412d0cf04cSSteve Twiss match = of_match_device(of_match_ptr(da9210_dt_ids),
1422d0cf04cSSteve Twiss &i2c->dev);
1432d0cf04cSSteve Twiss if (!match) {
1442d0cf04cSSteve Twiss dev_err(&i2c->dev, "Error: No device match found\n");
1452d0cf04cSSteve Twiss return -ENODEV;
1462d0cf04cSSteve Twiss }
1472d0cf04cSSteve Twiss }
14816f10918SSteve Twiss
14916f10918SSteve Twiss chip = devm_kzalloc(&i2c->dev, sizeof(struct da9210), GFP_KERNEL);
1506c48acfbSSachin Kamat if (!chip)
15116f10918SSteve Twiss return -ENOMEM;
15216f10918SSteve Twiss
15316f10918SSteve Twiss chip->regmap = devm_regmap_init_i2c(i2c, &da9210_regmap_config);
15416f10918SSteve Twiss if (IS_ERR(chip->regmap)) {
15516f10918SSteve Twiss error = PTR_ERR(chip->regmap);
15616f10918SSteve Twiss dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
15716f10918SSteve Twiss error);
15816f10918SSteve Twiss return error;
15916f10918SSteve Twiss }
16016f10918SSteve Twiss
16116f10918SSteve Twiss config.dev = &i2c->dev;
162937433c2SGuennadi Liakhovetski config.init_data = pdata ? &pdata->da9210_constraints :
163072e78b1SJavier Martinez Canillas of_get_regulator_init_data(dev, dev->of_node, &da9210_reg);
16416f10918SSteve Twiss config.driver_data = chip;
16516f10918SSteve Twiss config.regmap = chip->regmap;
166937433c2SGuennadi Liakhovetski config.of_node = dev->of_node;
16716f10918SSteve Twiss
1684d9cbff5SGeert Uytterhoeven /* Mask all interrupt sources to deassert interrupt line */
1694d9cbff5SGeert Uytterhoeven error = regmap_write(chip->regmap, DA9210_REG_MASK_A, ~0);
1704d9cbff5SGeert Uytterhoeven if (!error)
1714d9cbff5SGeert Uytterhoeven error = regmap_write(chip->regmap, DA9210_REG_MASK_B, ~0);
1724d9cbff5SGeert Uytterhoeven if (error) {
1734d9cbff5SGeert Uytterhoeven dev_err(&i2c->dev, "Failed to write to mask reg: %d\n", error);
1744d9cbff5SGeert Uytterhoeven return error;
1754d9cbff5SGeert Uytterhoeven }
1764d9cbff5SGeert Uytterhoeven
17711c0da7bSJingoo Han rdev = devm_regulator_register(&i2c->dev, &da9210_reg, &config);
17816f10918SSteve Twiss if (IS_ERR(rdev)) {
17916f10918SSteve Twiss dev_err(&i2c->dev, "Failed to register DA9210 regulator\n");
18016f10918SSteve Twiss return PTR_ERR(rdev);
18116f10918SSteve Twiss }
18216f10918SSteve Twiss
18316f10918SSteve Twiss chip->rdev = rdev;
18442457460SGeert Uytterhoeven if (i2c->irq) {
18542457460SGeert Uytterhoeven error = devm_request_threaded_irq(&i2c->dev, i2c->irq, NULL,
18642457460SGeert Uytterhoeven da9210_irq_handler,
18742457460SGeert Uytterhoeven IRQF_TRIGGER_LOW |
18842457460SGeert Uytterhoeven IRQF_ONESHOT | IRQF_SHARED,
18942457460SGeert Uytterhoeven "da9210", chip);
19042457460SGeert Uytterhoeven if (error) {
19142457460SGeert Uytterhoeven dev_err(&i2c->dev, "Failed to request IRQ%u: %d\n",
19242457460SGeert Uytterhoeven i2c->irq, error);
19342457460SGeert Uytterhoeven return error;
19442457460SGeert Uytterhoeven }
19542457460SGeert Uytterhoeven
19642457460SGeert Uytterhoeven error = regmap_update_bits(chip->regmap, DA9210_REG_MASK_B,
19742457460SGeert Uytterhoeven DA9210_M_OVCURR | DA9210_M_NPWRGOOD |
19842457460SGeert Uytterhoeven DA9210_M_TEMP_WARN |
19942457460SGeert Uytterhoeven DA9210_M_TEMP_CRIT | DA9210_M_VMAX, 0);
20042457460SGeert Uytterhoeven if (error < 0) {
20142457460SGeert Uytterhoeven dev_err(&i2c->dev, "Failed to update mask reg: %d\n",
20242457460SGeert Uytterhoeven error);
20342457460SGeert Uytterhoeven return error;
20442457460SGeert Uytterhoeven }
20542457460SGeert Uytterhoeven } else {
20642457460SGeert Uytterhoeven dev_warn(&i2c->dev, "No IRQ configured\n");
20742457460SGeert Uytterhoeven }
20816f10918SSteve Twiss
20916f10918SSteve Twiss i2c_set_clientdata(i2c, chip);
21016f10918SSteve Twiss
21116f10918SSteve Twiss return 0;
21216f10918SSteve Twiss }
21316f10918SSteve Twiss
21416f10918SSteve Twiss static const struct i2c_device_id da9210_i2c_id[] = {
21516f10918SSteve Twiss {"da9210", 0},
21616f10918SSteve Twiss {},
21716f10918SSteve Twiss };
21816f10918SSteve Twiss
21916f10918SSteve Twiss MODULE_DEVICE_TABLE(i2c, da9210_i2c_id);
22016f10918SSteve Twiss
22116f10918SSteve Twiss static struct i2c_driver da9210_regulator_driver = {
22216f10918SSteve Twiss .driver = {
22316f10918SSteve Twiss .name = "da9210",
224259b93b2SDouglas Anderson .probe_type = PROBE_PREFER_ASYNCHRONOUS,
2252d0cf04cSSteve Twiss .of_match_table = of_match_ptr(da9210_dt_ids),
22616f10918SSteve Twiss },
227*964e1865SUwe Kleine-König .probe = da9210_i2c_probe,
22816f10918SSteve Twiss .id_table = da9210_i2c_id,
22916f10918SSteve Twiss };
23016f10918SSteve Twiss
23116f10918SSteve Twiss module_i2c_driver(da9210_regulator_driver);
23216f10918SSteve Twiss
23316f10918SSteve Twiss MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
23416f10918SSteve Twiss MODULE_DESCRIPTION("Regulator device driver for Dialog DA9210");
23516f10918SSteve Twiss MODULE_LICENSE("GPL v2");
236