/* * da9211-regulator.c - Regulator device driver for DA9211/DA9213/DA9215 * Copyright (C) 2015 Dialog Semiconductor Ltd. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. */ #include <linux/err.h> #include <linux/gpio.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/regulator/driver.h> #include <linux/regulator/machine.h> #include <linux/regmap.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/of_gpio.h> #include <linux/regulator/of_regulator.h> #include <linux/regulator/da9211.h> #include "da9211-regulator.h" /* DEVICE IDs */ #define DA9211_DEVICE_ID 0x22 #define DA9213_DEVICE_ID 0x23 #define DA9215_DEVICE_ID 0x24 #define DA9211_BUCK_MODE_SLEEP 1 #define DA9211_BUCK_MODE_SYNC 2 #define DA9211_BUCK_MODE_AUTO 3 /* DA9211 REGULATOR IDs */ #define DA9211_ID_BUCKA 0 #define DA9211_ID_BUCKB 1 struct da9211 { struct device *dev; struct regmap *regmap; struct da9211_pdata *pdata; struct regulator_dev *rdev[DA9211_MAX_REGULATORS]; int num_regulator; int chip_irq; int chip_id; }; static const struct regmap_range_cfg da9211_regmap_range[] = { { .selector_reg = DA9211_REG_PAGE_CON, .selector_mask = DA9211_REG_PAGE_MASK, .selector_shift = DA9211_REG_PAGE_SHIFT, .window_start = 0, .window_len = 256, .range_min = 0, .range_max = 5*128, }, }; static const struct regmap_config da9211_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = 5 * 128, .ranges = da9211_regmap_range, .num_ranges = ARRAY_SIZE(da9211_regmap_range), }; /* Default limits measured in millivolts and milliamps */ #define DA9211_MIN_MV 300 #define DA9211_MAX_MV 1570 #define DA9211_STEP_MV 10 /* Current limits for DA9211 buck (uA) indices * corresponds with register values */ static const int da9211_current_limits[] = { 2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000 }; /* Current limits for DA9213 buck (uA) indices * corresponds with register values */ static const int da9213_current_limits[] = { 3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000 }; /* Current limits for DA9215 buck (uA) indices * corresponds with register values */ static const int da9215_current_limits[] = { 4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000 }; static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev) { int id = rdev_get_id(rdev); struct da9211 *chip = rdev_get_drvdata(rdev); unsigned int data; int ret, mode = 0; ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data); if (ret < 0) return ret; switch (data & 0x03) { case DA9211_BUCK_MODE_SYNC: mode = REGULATOR_MODE_FAST; break; case DA9211_BUCK_MODE_AUTO: mode = REGULATOR_MODE_NORMAL; break; case DA9211_BUCK_MODE_SLEEP: mode = REGULATOR_MODE_STANDBY; break; } return mode; } static int da9211_buck_set_mode(struct regulator_dev *rdev, unsigned int mode) { int id = rdev_get_id(rdev); struct da9211 *chip = rdev_get_drvdata(rdev); int val = 0; switch (mode) { case REGULATOR_MODE_FAST: val = DA9211_BUCK_MODE_SYNC; break; case REGULATOR_MODE_NORMAL: val = DA9211_BUCK_MODE_AUTO; break; case REGULATOR_MODE_STANDBY: val = DA9211_BUCK_MODE_SLEEP; break; } return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id, 0x03, val); } static int da9211_set_current_limit(struct regulator_dev *rdev, int min, int max) { int id = rdev_get_id(rdev); struct da9211 *chip = rdev_get_drvdata(rdev); int i, max_size; const int *current_limits; switch (chip->chip_id) { case DA9211: current_limits = da9211_current_limits; max_size = ARRAY_SIZE(da9211_current_limits)-1; break; case DA9213: current_limits = da9213_current_limits; max_size = ARRAY_SIZE(da9213_current_limits)-1; break; case DA9215: current_limits = da9215_current_limits; max_size = ARRAY_SIZE(da9215_current_limits)-1; break; default: return -EINVAL; } /* search for closest to maximum */ for (i = max_size; i >= 0; i--) { if (min <= current_limits[i] && max >= current_limits[i]) { return regmap_update_bits(chip->regmap, DA9211_REG_BUCK_ILIM, (0x0F << id*4), (i << id*4)); } } return -EINVAL; } static int da9211_get_current_limit(struct regulator_dev *rdev) { int id = rdev_get_id(rdev); struct da9211 *chip = rdev_get_drvdata(rdev); unsigned int data; int ret; const int *current_limits; switch (chip->chip_id) { case DA9211: current_limits = da9211_current_limits; break; case DA9213: current_limits = da9213_current_limits; break; case DA9215: current_limits = da9215_current_limits; break; default: return -EINVAL; } ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data); if (ret < 0) return ret; /* select one of 16 values: 0000 (2000mA or 3000mA) * to 1111 (5000mA or 6000mA). */ data = (data >> id*4) & 0x0F; return current_limits[data]; } static const struct regulator_ops da9211_buck_ops = { .get_mode = da9211_buck_get_mode, .set_mode = da9211_buck_set_mode, .enable = regulator_enable_regmap, .disable = regulator_disable_regmap, .is_enabled = regulator_is_enabled_regmap, .set_voltage_sel = regulator_set_voltage_sel_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, .list_voltage = regulator_list_voltage_linear, .set_current_limit = da9211_set_current_limit, .get_current_limit = da9211_get_current_limit, }; #define DA9211_BUCK(_id) \ {\ .name = #_id,\ .ops = &da9211_buck_ops,\ .type = REGULATOR_VOLTAGE,\ .id = DA9211_ID_##_id,\ .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\ .min_uV = (DA9211_MIN_MV * 1000),\ .uV_step = (DA9211_STEP_MV * 1000),\ .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\ .enable_mask = DA9211_BUCKA_EN,\ .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\ .vsel_mask = DA9211_VBUCK_MASK,\ .owner = THIS_MODULE,\ } static struct regulator_desc da9211_regulators[] = { DA9211_BUCK(BUCKA), DA9211_BUCK(BUCKB), }; #ifdef CONFIG_OF static struct of_regulator_match da9211_matches[] = { [DA9211_ID_BUCKA] = { .name = "BUCKA" }, [DA9211_ID_BUCKB] = { .name = "BUCKB" }, }; static struct da9211_pdata *da9211_parse_regulators_dt( struct device *dev) { struct da9211_pdata *pdata; struct device_node *node; int i, num, n; node = of_get_child_by_name(dev->of_node, "regulators"); if (!node) { dev_err(dev, "regulators node not found\n"); return ERR_PTR(-ENODEV); } num = of_regulator_match(dev, node, da9211_matches, ARRAY_SIZE(da9211_matches)); of_node_put(node); if (num < 0) { dev_err(dev, "Failed to match regulators\n"); return ERR_PTR(-EINVAL); } pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return ERR_PTR(-ENOMEM); pdata->num_buck = num; n = 0; for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) { if (!da9211_matches[i].init_data) continue; pdata->init_data[n] = da9211_matches[i].init_data; pdata->reg_node[n] = da9211_matches[i].of_node; pdata->gpio_ren[n] = of_get_named_gpio(da9211_matches[i].of_node, "enable-gpios", 0); n++; } return pdata; } #else static struct da9211_pdata *da9211_parse_regulators_dt( struct device *dev) { return ERR_PTR(-ENODEV); } #endif static irqreturn_t da9211_irq_handler(int irq, void *data) { struct da9211 *chip = data; int reg_val, err, ret = IRQ_NONE; err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, ®_val); if (err < 0) goto error_i2c; if (reg_val & DA9211_E_OV_CURR_A) { regulator_notifier_call_chain(chip->rdev[0], REGULATOR_EVENT_OVER_CURRENT, NULL); err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, DA9211_E_OV_CURR_A); if (err < 0) goto error_i2c; ret = IRQ_HANDLED; } if (reg_val & DA9211_E_OV_CURR_B) { regulator_notifier_call_chain(chip->rdev[1], REGULATOR_EVENT_OVER_CURRENT, NULL); err = regmap_write(chip->regmap, DA9211_REG_EVENT_B, DA9211_E_OV_CURR_B); if (err < 0) goto error_i2c; ret = IRQ_HANDLED; } return ret; error_i2c: dev_err(chip->dev, "I2C error : %d\n", err); return IRQ_NONE; } static int da9211_regulator_init(struct da9211 *chip) { struct regulator_config config = { }; int i, ret; unsigned int data; ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data); if (ret < 0) { dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret); return ret; } data &= DA9211_SLAVE_SEL; /* If configuration for 1/2 bucks is different between platform data * and the register, driver should exit. */ if (chip->pdata->num_buck == 1 && data == 0x00) chip->num_regulator = 1; else if (chip->pdata->num_buck == 2 && data != 0x00) chip->num_regulator = 2; else { dev_err(chip->dev, "Configuration is mismatched\n"); return -EINVAL; } for (i = 0; i < chip->num_regulator; i++) { config.init_data = chip->pdata->init_data[i]; config.dev = chip->dev; config.driver_data = chip; config.regmap = chip->regmap; config.of_node = chip->pdata->reg_node[i]; if (gpio_is_valid(chip->pdata->gpio_ren[i])) { config.ena_gpio = chip->pdata->gpio_ren[i]; config.ena_gpio_initialized = true; } else { config.ena_gpio = -EINVAL; config.ena_gpio_initialized = false; } chip->rdev[i] = devm_regulator_register(chip->dev, &da9211_regulators[i], &config); if (IS_ERR(chip->rdev[i])) { dev_err(chip->dev, "Failed to register DA9211 regulator\n"); return PTR_ERR(chip->rdev[i]); } if (chip->chip_irq != 0) { ret = regmap_update_bits(chip->regmap, DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0); if (ret < 0) { dev_err(chip->dev, "Failed to update mask reg: %d\n", ret); return ret; } } } return 0; } /* * I2C driver interface functions */ static int da9211_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { struct da9211 *chip; int error, ret; unsigned int data; chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL); if (!chip) return -ENOMEM; chip->dev = &i2c->dev; chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config); if (IS_ERR(chip->regmap)) { error = PTR_ERR(chip->regmap); dev_err(chip->dev, "Failed to allocate register map: %d\n", error); return error; } i2c_set_clientdata(i2c, chip); chip->pdata = i2c->dev.platform_data; ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data); if (ret < 0) { dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret); return ret; } switch (data) { case DA9211_DEVICE_ID: chip->chip_id = DA9211; break; case DA9213_DEVICE_ID: chip->chip_id = DA9213; break; case DA9215_DEVICE_ID: chip->chip_id = DA9215; break; default: dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data); return -ENODEV; } if (!chip->pdata) chip->pdata = da9211_parse_regulators_dt(chip->dev); if (IS_ERR(chip->pdata)) { dev_err(chip->dev, "No regulators defined for the platform\n"); return PTR_ERR(chip->pdata); } chip->chip_irq = i2c->irq; if (chip->chip_irq != 0) { ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL, da9211_irq_handler, IRQF_TRIGGER_LOW|IRQF_ONESHOT, "da9211", chip); if (ret != 0) { dev_err(chip->dev, "Failed to request IRQ: %d\n", chip->chip_irq); return ret; } } else { dev_warn(chip->dev, "No IRQ configured\n"); } ret = da9211_regulator_init(chip); if (ret < 0) dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret); return ret; } static const struct i2c_device_id da9211_i2c_id[] = { {"da9211", DA9211}, {"da9213", DA9213}, {"da9215", DA9215}, {}, }; MODULE_DEVICE_TABLE(i2c, da9211_i2c_id); #ifdef CONFIG_OF static const struct of_device_id da9211_dt_ids[] = { { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] }, { .compatible = "dlg,da9213", .data = &da9211_i2c_id[1] }, { .compatible = "dlg,da9215", .data = &da9211_i2c_id[2] }, {}, }; MODULE_DEVICE_TABLE(of, da9211_dt_ids); #endif static struct i2c_driver da9211_regulator_driver = { .driver = { .name = "da9211", .of_match_table = of_match_ptr(da9211_dt_ids), }, .probe = da9211_i2c_probe, .id_table = da9211_i2c_id, }; module_i2c_driver(da9211_regulator_driver); MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>"); MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213/DA9215"); MODULE_LICENSE("GPL");