| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Tim Harvey | 1578 | 91.32% | 1 | 9.09% |
| Marek Vašut | 97 | 5.61% | 1 | 9.09% |
| Javier Martinez Canillas | 33 | 1.91% | 1 | 9.09% |
| Axel Lin | 7 | 0.41% | 3 | 27.27% |
| David Frey | 6 | 0.35% | 1 | 9.09% |
| Bhumika Goyal | 3 | 0.17% | 1 | 9.09% |
| Thomas Gleixner | 2 | 0.12% | 1 | 9.09% |
| JiSheng Zhang | 1 | 0.06% | 1 | 9.09% |
| Rikard Falkeborn | 1 | 0.06% | 1 | 9.09% |
| Total | 1728 | 11 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2016 Gateworks Corporation, Inc. All Rights Reserved. */ #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/of.h> #include <linux/regmap.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> #include <linux/regulator/of_regulator.h> #define DRIVER_NAME "ltc3676" /* LTC3676 Registers */ #define LTC3676_BUCK1 0x01 #define LTC3676_BUCK2 0x02 #define LTC3676_BUCK3 0x03 #define LTC3676_BUCK4 0x04 #define LTC3676_LDOA 0x05 #define LTC3676_LDOB 0x06 #define LTC3676_SQD1 0x07 #define LTC3676_SQD2 0x08 #define LTC3676_CNTRL 0x09 #define LTC3676_DVB1A 0x0A #define LTC3676_DVB1B 0x0B #define LTC3676_DVB2A 0x0C #define LTC3676_DVB2B 0x0D #define LTC3676_DVB3A 0x0E #define LTC3676_DVB3B 0x0F #define LTC3676_DVB4A 0x10 #define LTC3676_DVB4B 0x11 #define LTC3676_MSKIRQ 0x12 #define LTC3676_MSKPG 0x13 #define LTC3676_USER 0x14 #define LTC3676_IRQSTAT 0x15 #define LTC3676_PGSTATL 0x16 #define LTC3676_PGSTATRT 0x17 #define LTC3676_HRST 0x1E #define LTC3676_CLIRQ 0x1F #define LTC3676_DVBxA_REF_SELECT BIT(5) #define LTC3676_DVBxB_PGOOD_MASK BIT(5) #define LTC3676_IRQSTAT_PGOOD_TIMEOUT BIT(3) #define LTC3676_IRQSTAT_UNDERVOLT_WARN BIT(4) #define LTC3676_IRQSTAT_UNDERVOLT_FAULT BIT(5) #define LTC3676_IRQSTAT_THERMAL_WARN BIT(6) #define LTC3676_IRQSTAT_THERMAL_FAULT BIT(7) enum ltc3676_reg { LTC3676_SW1, LTC3676_SW2, LTC3676_SW3, LTC3676_SW4, LTC3676_LDO1, LTC3676_LDO2, LTC3676_LDO3, LTC3676_LDO4, LTC3676_NUM_REGULATORS, }; struct ltc3676 { struct regmap *regmap; struct device *dev; struct regulator_desc regulator_descs[LTC3676_NUM_REGULATORS]; struct regulator_dev *regulators[LTC3676_NUM_REGULATORS]; }; static int ltc3676_set_suspend_voltage(struct regulator_dev *rdev, int uV) { struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev); struct device *dev = ltc3676->dev; int dcdc = rdev_get_id(rdev); int sel; dev_dbg(dev, "%s id=%d uV=%d\n", __func__, dcdc, uV); sel = regulator_map_voltage_linear(rdev, uV, uV); if (sel < 0) return sel; /* DVBB register follows right after the corresponding DVBA register */ return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1, rdev->desc->vsel_mask, sel); } static int ltc3676_set_suspend_mode(struct regulator_dev *rdev, unsigned int mode) { struct ltc3676 *ltc3676= rdev_get_drvdata(rdev); struct device *dev = ltc3676->dev; int mask, val; int dcdc = rdev_get_id(rdev); dev_dbg(dev, "%s id=%d mode=%d\n", __func__, dcdc, mode); mask = LTC3676_DVBxA_REF_SELECT; switch (mode) { case REGULATOR_MODE_STANDBY: val = 0; /* select DVBxA */ break; case REGULATOR_MODE_NORMAL: val = LTC3676_DVBxA_REF_SELECT; /* select DVBxB */ break; default: dev_warn(&rdev->dev, "%s: regulator mode: 0x%x not supported\n", rdev->desc->name, mode); return -EINVAL; } return regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg, mask, val); } static int ltc3676_set_voltage_sel(struct regulator_dev *rdev, unsigned selector) { struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev); struct device *dev = ltc3676->dev; int ret, dcdc = rdev_get_id(rdev); dev_dbg(dev, "%s id=%d selector=%d\n", __func__, dcdc, selector); ret = regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1, LTC3676_DVBxB_PGOOD_MASK, LTC3676_DVBxB_PGOOD_MASK); if (ret) return ret; return regulator_set_voltage_sel_regmap(rdev, selector); } static inline unsigned int ltc3676_scale(unsigned int uV, u32 r1, u32 r2) { uint64_t tmp; if (uV == 0) return 0; tmp = (uint64_t)uV * r1; do_div(tmp, r2); return uV + (unsigned int)tmp; } static int ltc3676_of_parse_cb(struct device_node *np, const struct regulator_desc *desc, struct regulator_config *config) { struct ltc3676 *ltc3676 = config->driver_data; struct regulator_desc *rdesc = <c3676->regulator_descs[desc->id]; u32 r[2]; int ret; /* LDO3 has a fixed output */ if (desc->id == LTC3676_LDO3) return 0; ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2); if (ret) { dev_err(ltc3676->dev, "Failed to parse voltage divider: %d\n", ret); return ret; } rdesc->min_uV = ltc3676_scale(desc->min_uV, r[0], r[1]); rdesc->uV_step = ltc3676_scale(desc->uV_step, r[0], r[1]); rdesc->fixed_uV = ltc3676_scale(desc->fixed_uV, r[0], r[1]); return 0; } /* SW1, SW2, SW3, SW4 linear 0.8V-3.3V with scalar via R1/R2 feeback res */ static const struct regulator_ops ltc3676_linear_regulator_ops = { .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .list_voltage = regulator_list_voltage_linear, .set_voltage_sel = ltc3676_set_voltage_sel, .get_voltage_sel = regulator_get_voltage_sel_regmap, .set_suspend_voltage = ltc3676_set_suspend_voltage, .set_suspend_mode = ltc3676_set_suspend_mode, }; /* LDO1 always on fixed 0.8V-3.3V via scalar via R1/R2 feeback res */ static const struct regulator_ops ltc3676_fixed_standby_regulator_ops = { }; /* LDO2, LDO3 fixed (LDO2 has external scalar via R1/R2 feedback res) */ static const struct regulator_ops ltc3676_fixed_regulator_ops = { .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, }; #define LTC3676_REG(_id, _name, _ops, en_reg, en_bit, dvba_reg, dvb_mask) \ [LTC3676_ ## _id] = { \ .name = #_name, \ .of_match = of_match_ptr(#_name), \ .regulators_node = of_match_ptr("regulators"), \ .of_parse_cb = ltc3676_of_parse_cb, \ .n_voltages = (dvb_mask) + 1, \ .min_uV = (dvba_reg) ? 412500 : 0, \ .uV_step = (dvba_reg) ? 12500 : 0, \ .ramp_delay = (dvba_reg) ? 800 : 0, \ .fixed_uV = (dvb_mask) ? 0 : 725000, \ .ops = <c3676_ ## _ops ## _regulator_ops, \ .type = REGULATOR_VOLTAGE, \ .id = LTC3676_ ## _id, \ .owner = THIS_MODULE, \ .vsel_reg = (dvba_reg), \ .vsel_mask = (dvb_mask), \ .enable_reg = (en_reg), \ .enable_mask = (1 << en_bit), \ } #define LTC3676_LINEAR_REG(_id, _name, _en, _dvba) \ LTC3676_REG(_id, _name, linear, \ LTC3676_ ## _en, 7, \ LTC3676_ ## _dvba, 0x1f) #define LTC3676_FIXED_REG(_id, _name, _en_reg, _en_bit) \ LTC3676_REG(_id, _name, fixed, LTC3676_ ## _en_reg, _en_bit, 0, 0) static const struct regulator_desc ltc3676_regulators[LTC3676_NUM_REGULATORS] = { LTC3676_LINEAR_REG(SW1, sw1, BUCK1, DVB1A), LTC3676_LINEAR_REG(SW2, sw2, BUCK2, DVB2A), LTC3676_LINEAR_REG(SW3, sw3, BUCK3, DVB3A), LTC3676_LINEAR_REG(SW4, sw4, BUCK4, DVB4A), LTC3676_REG(LDO1, ldo1, fixed_standby, 0, 0, 0, 0), LTC3676_FIXED_REG(LDO2, ldo2, LDOA, 2), LTC3676_FIXED_REG(LDO3, ldo3, LDOA, 5), LTC3676_FIXED_REG(LDO4, ldo4, LDOB, 2), }; static bool ltc3676_readable_writeable_reg(struct device *dev, unsigned int reg) { switch (reg) { case LTC3676_BUCK1 ... LTC3676_IRQSTAT: case LTC3676_HRST: case LTC3676_CLIRQ: return true; } return false; } static bool ltc3676_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case LTC3676_IRQSTAT ... LTC3676_PGSTATRT: return true; } return false; } static const struct regmap_config ltc3676_regmap_config = { .reg_bits = 8, .val_bits = 8, .writeable_reg = ltc3676_readable_writeable_reg, .readable_reg = ltc3676_readable_writeable_reg, .volatile_reg = ltc3676_volatile_reg, .max_register = LTC3676_CLIRQ, .use_single_read = true, .use_single_write = true, .cache_type = REGCACHE_RBTREE, }; static irqreturn_t ltc3676_isr(int irq, void *dev_id) { struct ltc3676 *ltc3676 = dev_id; struct device *dev = ltc3676->dev; unsigned int i, irqstat, event; regmap_read(ltc3676->regmap, LTC3676_IRQSTAT, &irqstat); dev_dbg(dev, "irq%d irqstat=0x%02x\n", irq, irqstat); if (irqstat & LTC3676_IRQSTAT_THERMAL_WARN) { dev_warn(dev, "Over-temperature Warning\n"); event = REGULATOR_EVENT_OVER_TEMP; for (i = 0; i < LTC3676_NUM_REGULATORS; i++) regulator_notifier_call_chain(ltc3676->regulators[i], event, NULL); } if (irqstat & LTC3676_IRQSTAT_UNDERVOLT_WARN) { dev_info(dev, "Undervoltage Warning\n"); event = REGULATOR_EVENT_UNDER_VOLTAGE; for (i = 0; i < LTC3676_NUM_REGULATORS; i++) regulator_notifier_call_chain(ltc3676->regulators[i], event, NULL); } /* Clear warning condition */ regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0); return IRQ_HANDLED; } static int ltc3676_regulator_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct regulator_init_data *init_data = dev_get_platdata(dev); struct regulator_desc *descs; struct ltc3676 *ltc3676; int i, ret; ltc3676 = devm_kzalloc(dev, sizeof(*ltc3676), GFP_KERNEL); if (!ltc3676) return -ENOMEM; i2c_set_clientdata(client, ltc3676); ltc3676->dev = dev; descs = ltc3676->regulator_descs; memcpy(descs, ltc3676_regulators, sizeof(ltc3676_regulators)); descs[LTC3676_LDO3].fixed_uV = 1800000; /* LDO3 is fixed 1.8V */ ltc3676->regmap = devm_regmap_init_i2c(client, <c3676_regmap_config); if (IS_ERR(ltc3676->regmap)) { ret = PTR_ERR(ltc3676->regmap); dev_err(dev, "failed to initialize regmap: %d\n", ret); return ret; } for (i = 0; i < LTC3676_NUM_REGULATORS; i++) { struct regulator_desc *desc = <c3676->regulator_descs[i]; struct regulator_config config = { }; if (init_data) config.init_data = &init_data[i]; config.dev = dev; config.driver_data = ltc3676; ltc3676->regulators[i] = devm_regulator_register(dev, desc, &config); if (IS_ERR(ltc3676->regulators[i])) { ret = PTR_ERR(ltc3676->regulators[i]); dev_err(dev, "failed to register regulator %s: %d\n", desc->name, ret); return ret; } } regmap_write(ltc3676->regmap, LTC3676_CLIRQ, 0); if (client->irq) { ret = devm_request_threaded_irq(dev, client->irq, NULL, ltc3676_isr, IRQF_TRIGGER_LOW | IRQF_ONESHOT, client->name, ltc3676); if (ret) { dev_err(dev, "Failed to request IRQ: %d\n", ret); return ret; } } return 0; } static const struct i2c_device_id ltc3676_i2c_id[] = { { "ltc3676" }, { } }; MODULE_DEVICE_TABLE(i2c, ltc3676_i2c_id); static const struct of_device_id __maybe_unused ltc3676_of_match[] = { { .compatible = "lltc,ltc3676" }, { }, }; MODULE_DEVICE_TABLE(of, ltc3676_of_match); static struct i2c_driver ltc3676_driver = { .driver = { .name = DRIVER_NAME, .of_match_table = of_match_ptr(ltc3676_of_match), }, .probe_new = ltc3676_regulator_probe, .id_table = ltc3676_i2c_id, }; module_i2c_driver(ltc3676_driver); MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>"); MODULE_DESCRIPTION("Regulator driver for Linear Technology LTC3676"); MODULE_LICENSE("GPL v2");
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