cregit-Linux how code gets into the kernel

Release 4.10 drivers/regulator/ltc3676.c

/*
 * Copyright (C) 2016 Gateworks Corporation, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */
#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_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); }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey102100.00%1100.00%
Total102100.00%1100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey129100.00%1100.00%
Total129100.00%1100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey55100.00%1100.00%
Total55100.00%1100.00%


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 = &ltc3676->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; }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey166100.00%1100.00%
Total166100.00%1100.00%

/* SW1, SW2, SW3, SW4 linear 0.8V-3.3V with scalar via R1/R2 feeback res */ static 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 = regulator_set_voltage_sel_regmap, .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 struct regulator_ops ltc3676_fixed_standby_regulator_ops = { }; /* LDO2, LDO3 fixed (LDO2 has external scalar via R1/R2 feedback res) */ static 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 = &ltc3676_ ## _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 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_writeable_reg(struct device *dev, unsigned int reg) { switch (reg) { case LTC3676_IRQSTAT: case LTC3676_BUCK1: case LTC3676_BUCK2: case LTC3676_BUCK3: case LTC3676_BUCK4: case LTC3676_LDOA: case LTC3676_LDOB: case LTC3676_SQD1: case LTC3676_SQD2: case LTC3676_CNTRL: case LTC3676_DVB1A: case LTC3676_DVB1B: case LTC3676_DVB2A: case LTC3676_DVB2B: case LTC3676_DVB3A: case LTC3676_DVB3B: case LTC3676_DVB4A: case LTC3676_DVB4B: case LTC3676_MSKIRQ: case LTC3676_MSKPG: case LTC3676_USER: case LTC3676_HRST: case LTC3676_CLIRQ: return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey96100.00%1100.00%
Total96100.00%1100.00%


static bool ltc3676_readable_reg(struct device *dev, unsigned int reg) { switch (reg) { case LTC3676_IRQSTAT: case LTC3676_BUCK1: case LTC3676_BUCK2: case LTC3676_BUCK3: case LTC3676_BUCK4: case LTC3676_LDOA: case LTC3676_LDOB: case LTC3676_SQD1: case LTC3676_SQD2: case LTC3676_CNTRL: case LTC3676_DVB1A: case LTC3676_DVB1B: case LTC3676_DVB2A: case LTC3676_DVB2B: case LTC3676_DVB3A: case LTC3676_DVB3B: case LTC3676_DVB4A: case LTC3676_DVB4B: case LTC3676_MSKIRQ: case LTC3676_MSKPG: case LTC3676_USER: case LTC3676_HRST: case LTC3676_CLIRQ: return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey96100.00%1100.00%
Total96100.00%1100.00%


static bool ltc3676_volatile_reg(struct device *dev, unsigned int reg) { switch (reg) { case LTC3676_IRQSTAT: case LTC3676_PGSTATL: case LTC3676_PGSTATRT: return true; } return false; }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey36100.00%1100.00%
Total36100.00%1100.00%

static const struct regmap_config ltc3676_regmap_config = { .reg_bits = 8, .val_bits = 8, .writeable_reg = ltc3676_writeable_reg, .readable_reg = ltc3676_readable_reg, .volatile_reg = ltc3676_volatile_reg, .max_register = LTC3676_CLIRQ, .use_single_rw = 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; }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey167100.00%1100.00%
Total167100.00%1100.00%


static int ltc3676_regulator_probe(struct i2c_client *client, const struct i2c_device_id *id) { 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, &ltc3676_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 = &ltc3676->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; }

Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey345100.00%1100.00%
Total345100.00%1100.00%

static const struct i2c_device_id ltc3676_i2c_id[] = { { "ltc3676" }, { } }; MODULE_DEVICE_TABLE(i2c, ltc3676_i2c_id); static struct i2c_driver ltc3676_driver = { .driver = { .name = DRIVER_NAME, }, .probe = 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 LTC1376"); MODULE_LICENSE("GPL v2");

Overall Contributors

PersonTokensPropCommitsCommitProp
tim harveytim harvey1752100.00%1100.00%
Total1752100.00%1100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.