diff options
Diffstat (limited to 'drivers/regulator/max8997-regulator.c')
| -rw-r--r-- | drivers/regulator/max8997-regulator.c | 1224 |
1 files changed, 1224 insertions, 0 deletions
diff --git a/drivers/regulator/max8997-regulator.c b/drivers/regulator/max8997-regulator.c new file mode 100644 index 000000000..ad0c806b0 --- /dev/null +++ b/drivers/regulator/max8997-regulator.c @@ -0,0 +1,1224 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// max8997.c - Regulator driver for the Maxim 8997/8966 +// +// Copyright (C) 2011 Samsung Electronics +// MyungJoo Ham <myungjoo.ham@samsung.com> +// +// This driver is based on max8998.c + +#include <linux/bug.h> +#include <linux/err.h> +#include <linux/gpio.h> +#include <linux/of_gpio.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/machine.h> +#include <linux/mfd/max8997.h> +#include <linux/mfd/max8997-private.h> +#include <linux/regulator/of_regulator.h> + +struct max8997_data { + struct device *dev; + struct max8997_dev *iodev; + int num_regulators; + int ramp_delay; /* in mV/us */ + + bool buck1_gpiodvs; + bool buck2_gpiodvs; + bool buck5_gpiodvs; + u8 buck1_vol[8]; + u8 buck2_vol[8]; + u8 buck5_vol[8]; + int buck125_gpios[3]; + int buck125_gpioindex; + bool ignore_gpiodvs_side_effect; + + u8 saved_states[MAX8997_REG_MAX]; +}; + +static const unsigned int safeoutvolt[] = { + 4850000, + 4900000, + 4950000, + 3300000, +}; + +static inline void max8997_set_gpio(struct max8997_data *max8997) +{ + int set3 = (max8997->buck125_gpioindex) & 0x1; + int set2 = ((max8997->buck125_gpioindex) >> 1) & 0x1; + int set1 = ((max8997->buck125_gpioindex) >> 2) & 0x1; + + gpio_set_value(max8997->buck125_gpios[0], set1); + gpio_set_value(max8997->buck125_gpios[1], set2); + gpio_set_value(max8997->buck125_gpios[2], set3); +} + +struct voltage_map_desc { + int min; + int max; + int step; +}; + +/* Voltage maps in uV */ +static const struct voltage_map_desc ldo_voltage_map_desc = { + .min = 800000, .max = 3950000, .step = 50000, +}; /* LDO1 ~ 18, 21 all */ + +static const struct voltage_map_desc buck1245_voltage_map_desc = { + .min = 650000, .max = 2225000, .step = 25000, +}; /* Buck1, 2, 4, 5 */ + +static const struct voltage_map_desc buck37_voltage_map_desc = { + .min = 750000, .max = 3900000, .step = 50000, +}; /* Buck3, 7 */ + +/* current map in uA */ +static const struct voltage_map_desc charger_current_map_desc = { + .min = 200000, .max = 950000, .step = 50000, +}; + +static const struct voltage_map_desc topoff_current_map_desc = { + .min = 50000, .max = 200000, .step = 10000, +}; + +static const struct voltage_map_desc *reg_voltage_map[] = { + [MAX8997_LDO1] = &ldo_voltage_map_desc, + [MAX8997_LDO2] = &ldo_voltage_map_desc, + [MAX8997_LDO3] = &ldo_voltage_map_desc, + [MAX8997_LDO4] = &ldo_voltage_map_desc, + [MAX8997_LDO5] = &ldo_voltage_map_desc, + [MAX8997_LDO6] = &ldo_voltage_map_desc, + [MAX8997_LDO7] = &ldo_voltage_map_desc, + [MAX8997_LDO8] = &ldo_voltage_map_desc, + [MAX8997_LDO9] = &ldo_voltage_map_desc, + [MAX8997_LDO10] = &ldo_voltage_map_desc, + [MAX8997_LDO11] = &ldo_voltage_map_desc, + [MAX8997_LDO12] = &ldo_voltage_map_desc, + [MAX8997_LDO13] = &ldo_voltage_map_desc, + [MAX8997_LDO14] = &ldo_voltage_map_desc, + [MAX8997_LDO15] = &ldo_voltage_map_desc, + [MAX8997_LDO16] = &ldo_voltage_map_desc, + [MAX8997_LDO17] = &ldo_voltage_map_desc, + [MAX8997_LDO18] = &ldo_voltage_map_desc, + [MAX8997_LDO21] = &ldo_voltage_map_desc, + [MAX8997_BUCK1] = &buck1245_voltage_map_desc, + [MAX8997_BUCK2] = &buck1245_voltage_map_desc, + [MAX8997_BUCK3] = &buck37_voltage_map_desc, + [MAX8997_BUCK4] = &buck1245_voltage_map_desc, + [MAX8997_BUCK5] = &buck1245_voltage_map_desc, + [MAX8997_BUCK6] = NULL, + [MAX8997_BUCK7] = &buck37_voltage_map_desc, + [MAX8997_EN32KHZ_AP] = NULL, + [MAX8997_EN32KHZ_CP] = NULL, + [MAX8997_ENVICHG] = NULL, + [MAX8997_ESAFEOUT1] = NULL, + [MAX8997_ESAFEOUT2] = NULL, + [MAX8997_CHARGER_CV] = NULL, + [MAX8997_CHARGER] = &charger_current_map_desc, + [MAX8997_CHARGER_TOPOFF] = &topoff_current_map_desc, +}; + +static int max8997_list_voltage_charger_cv(struct regulator_dev *rdev, + unsigned int selector) +{ + int rid = rdev_get_id(rdev); + + if (rid != MAX8997_CHARGER_CV) + goto err; + + switch (selector) { + case 0x00: + return 4200000; + case 0x01 ... 0x0E: + return 4000000 + 20000 * (selector - 0x01); + case 0x0F: + return 4350000; + default: + return -EINVAL; + } +err: + return -EINVAL; +} + +static int max8997_list_voltage(struct regulator_dev *rdev, + unsigned int selector) +{ + const struct voltage_map_desc *desc; + int rid = rdev_get_id(rdev); + int val; + + if (rid < 0 || rid >= ARRAY_SIZE(reg_voltage_map)) + return -EINVAL; + + desc = reg_voltage_map[rid]; + if (desc == NULL) + return -EINVAL; + + val = desc->min + desc->step * selector; + if (val > desc->max) + return -EINVAL; + + return val; +} + +static int max8997_get_enable_register(struct regulator_dev *rdev, + int *reg, int *mask, int *pattern) +{ + int rid = rdev_get_id(rdev); + + switch (rid) { + case MAX8997_LDO1 ... MAX8997_LDO21: + *reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1); + *mask = 0xC0; + *pattern = 0xC0; + break; + case MAX8997_BUCK1: + *reg = MAX8997_REG_BUCK1CTRL; + *mask = 0x01; + *pattern = 0x01; + break; + case MAX8997_BUCK2: + *reg = MAX8997_REG_BUCK2CTRL; + *mask = 0x01; + *pattern = 0x01; + break; + case MAX8997_BUCK3: + *reg = MAX8997_REG_BUCK3CTRL; + *mask = 0x01; + *pattern = 0x01; + break; + case MAX8997_BUCK4: + *reg = MAX8997_REG_BUCK4CTRL; + *mask = 0x01; + *pattern = 0x01; + break; + case MAX8997_BUCK5: + *reg = MAX8997_REG_BUCK5CTRL; + *mask = 0x01; + *pattern = 0x01; + break; + case MAX8997_BUCK6: + *reg = MAX8997_REG_BUCK6CTRL; + *mask = 0x01; + *pattern = 0x01; + break; + case MAX8997_BUCK7: + *reg = MAX8997_REG_BUCK7CTRL; + *mask = 0x01; + *pattern = 0x01; + break; + case MAX8997_EN32KHZ_AP ... MAX8997_EN32KHZ_CP: + *reg = MAX8997_REG_MAINCON1; + *mask = 0x01 << (rid - MAX8997_EN32KHZ_AP); + *pattern = 0x01 << (rid - MAX8997_EN32KHZ_AP); + break; + case MAX8997_ENVICHG: + *reg = MAX8997_REG_MBCCTRL1; + *mask = 0x80; + *pattern = 0x80; + break; + case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2: + *reg = MAX8997_REG_SAFEOUTCTRL; + *mask = 0x40 << (rid - MAX8997_ESAFEOUT1); + *pattern = 0x40 << (rid - MAX8997_ESAFEOUT1); + break; + case MAX8997_CHARGER: + *reg = MAX8997_REG_MBCCTRL2; + *mask = 0x40; + *pattern = 0x40; + break; + default: + /* Not controllable or not exists */ + return -EINVAL; + } + + return 0; +} + +static int max8997_reg_is_enabled(struct regulator_dev *rdev) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + struct i2c_client *i2c = max8997->iodev->i2c; + int ret, reg, mask, pattern; + u8 val; + + ret = max8997_get_enable_register(rdev, ®, &mask, &pattern); + if (ret) + return ret; + + ret = max8997_read_reg(i2c, reg, &val); + if (ret) + return ret; + + return (val & mask) == pattern; +} + +static int max8997_reg_enable(struct regulator_dev *rdev) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + struct i2c_client *i2c = max8997->iodev->i2c; + int ret, reg, mask, pattern; + + ret = max8997_get_enable_register(rdev, ®, &mask, &pattern); + if (ret) + return ret; + + return max8997_update_reg(i2c, reg, pattern, mask); +} + +static int max8997_reg_disable(struct regulator_dev *rdev) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + struct i2c_client *i2c = max8997->iodev->i2c; + int ret, reg, mask, pattern; + + ret = max8997_get_enable_register(rdev, ®, &mask, &pattern); + if (ret) + return ret; + + return max8997_update_reg(i2c, reg, ~pattern, mask); +} + +static int max8997_get_voltage_register(struct regulator_dev *rdev, + int *_reg, int *_shift, int *_mask) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + int rid = rdev_get_id(rdev); + int reg, shift = 0, mask = 0x3f; + + switch (rid) { + case MAX8997_LDO1 ... MAX8997_LDO21: + reg = MAX8997_REG_LDO1CTRL + (rid - MAX8997_LDO1); + break; + case MAX8997_BUCK1: + reg = MAX8997_REG_BUCK1DVS1; + if (max8997->buck1_gpiodvs) + reg += max8997->buck125_gpioindex; + break; + case MAX8997_BUCK2: + reg = MAX8997_REG_BUCK2DVS1; + if (max8997->buck2_gpiodvs) + reg += max8997->buck125_gpioindex; + break; + case MAX8997_BUCK3: + reg = MAX8997_REG_BUCK3DVS; + break; + case MAX8997_BUCK4: + reg = MAX8997_REG_BUCK4DVS; + break; + case MAX8997_BUCK5: + reg = MAX8997_REG_BUCK5DVS1; + if (max8997->buck5_gpiodvs) + reg += max8997->buck125_gpioindex; + break; + case MAX8997_BUCK7: + reg = MAX8997_REG_BUCK7DVS; + break; + case MAX8997_ESAFEOUT1 ... MAX8997_ESAFEOUT2: + reg = MAX8997_REG_SAFEOUTCTRL; + shift = (rid == MAX8997_ESAFEOUT2) ? 2 : 0; + mask = 0x3; + break; + case MAX8997_CHARGER_CV: + reg = MAX8997_REG_MBCCTRL3; + shift = 0; + mask = 0xf; + break; + case MAX8997_CHARGER: + reg = MAX8997_REG_MBCCTRL4; + shift = 0; + mask = 0xf; + break; + case MAX8997_CHARGER_TOPOFF: + reg = MAX8997_REG_MBCCTRL5; + shift = 0; + mask = 0xf; + break; + default: + return -EINVAL; + } + + *_reg = reg; + *_shift = shift; + *_mask = mask; + + return 0; +} + +static int max8997_get_voltage_sel(struct regulator_dev *rdev) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + struct i2c_client *i2c = max8997->iodev->i2c; + int reg, shift, mask, ret; + u8 val; + + ret = max8997_get_voltage_register(rdev, ®, &shift, &mask); + if (ret) + return ret; + + ret = max8997_read_reg(i2c, reg, &val); + if (ret) + return ret; + + val >>= shift; + val &= mask; + + return val; +} + +static inline int max8997_get_voltage_proper_val( + const struct voltage_map_desc *desc, + int min_vol, int max_vol) +{ + int i; + + if (desc == NULL) + return -EINVAL; + + if (max_vol < desc->min || min_vol > desc->max) + return -EINVAL; + + if (min_vol < desc->min) + min_vol = desc->min; + + i = DIV_ROUND_UP(min_vol - desc->min, desc->step); + + if (desc->min + desc->step * i > max_vol) + return -EINVAL; + + return i; +} + +static int max8997_set_voltage_charger_cv(struct regulator_dev *rdev, + int min_uV, int max_uV, unsigned *selector) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + struct i2c_client *i2c = max8997->iodev->i2c; + int rid = rdev_get_id(rdev); + int lb, ub; + int reg, shift = 0, mask, ret = 0; + u8 val = 0x0; + + if (rid != MAX8997_CHARGER_CV) + return -EINVAL; + + ret = max8997_get_voltage_register(rdev, ®, &shift, &mask); + if (ret) + return ret; + + if (max_uV < 4000000 || min_uV > 4350000) + return -EINVAL; + + if (min_uV <= 4000000) + val = 0x1; + else if (min_uV <= 4200000 && max_uV >= 4200000) + val = 0x0; + else { + lb = (min_uV - 4000001) / 20000 + 2; + ub = (max_uV - 4000000) / 20000 + 1; + + if (lb > ub) + return -EINVAL; + + if (lb < 0xf) + val = lb; + else { + if (ub >= 0xf) + val = 0xf; + else + return -EINVAL; + } + } + + *selector = val; + + ret = max8997_update_reg(i2c, reg, val << shift, mask); + + return ret; +} + +/* + * For LDO1 ~ LDO21, BUCK1~5, BUCK7, CHARGER, CHARGER_TOPOFF + * BUCK1, 2, and 5 are available if they are not controlled by gpio + */ +static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev, + int min_uV, int max_uV, unsigned *selector) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + struct i2c_client *i2c = max8997->iodev->i2c; + const struct voltage_map_desc *desc; + int rid = rdev_get_id(rdev); + int i, reg, shift, mask, ret; + + switch (rid) { + case MAX8997_LDO1 ... MAX8997_LDO21: + break; + case MAX8997_BUCK1 ... MAX8997_BUCK5: + break; + case MAX8997_BUCK6: + return -EINVAL; + case MAX8997_BUCK7: + break; + case MAX8997_CHARGER: + break; + case MAX8997_CHARGER_TOPOFF: + break; + default: + return -EINVAL; + } + + desc = reg_voltage_map[rid]; + + i = max8997_get_voltage_proper_val(desc, min_uV, max_uV); + if (i < 0) + return i; + + ret = max8997_get_voltage_register(rdev, ®, &shift, &mask); + if (ret) + return ret; + + ret = max8997_update_reg(i2c, reg, i << shift, mask << shift); + *selector = i; + + return ret; +} + +static int max8997_set_voltage_buck_time_sel(struct regulator_dev *rdev, + unsigned int old_selector, + unsigned int new_selector) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + int rid = rdev_get_id(rdev); + const struct voltage_map_desc *desc = reg_voltage_map[rid]; + + /* Delay is required only if the voltage is increasing */ + if (old_selector >= new_selector) + return 0; + + /* No need to delay if gpio_dvs_mode */ + switch (rid) { + case MAX8997_BUCK1: + if (max8997->buck1_gpiodvs) + return 0; + break; + case MAX8997_BUCK2: + if (max8997->buck2_gpiodvs) + return 0; + break; + case MAX8997_BUCK5: + if (max8997->buck5_gpiodvs) + return 0; + break; + } + + switch (rid) { + case MAX8997_BUCK1: + case MAX8997_BUCK2: + case MAX8997_BUCK4: + case MAX8997_BUCK5: + return DIV_ROUND_UP(desc->step * (new_selector - old_selector), + max8997->ramp_delay * 1000); + } + + return 0; +} + +/* + * Assess the damage on the voltage setting of BUCK1,2,5 by the change. + * + * When GPIO-DVS mode is used for multiple bucks, changing the voltage value + * of one of the bucks may affect that of another buck, which is the side + * effect of the change (set_voltage). This function examines the GPIO-DVS + * configurations and checks whether such side-effect exists. + */ +static int max8997_assess_side_effect(struct regulator_dev *rdev, + u8 new_val, int *best) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + int rid = rdev_get_id(rdev); + u8 *buckx_val[3]; + bool buckx_gpiodvs[3]; + int side_effect[8]; + int min_side_effect = INT_MAX; + int i; + + *best = -1; + + switch (rid) { + case MAX8997_BUCK1: + rid = 0; + break; + case MAX8997_BUCK2: + rid = 1; + break; + case MAX8997_BUCK5: + rid = 2; + break; + default: + return -EINVAL; + } + + buckx_val[0] = max8997->buck1_vol; + buckx_val[1] = max8997->buck2_vol; + buckx_val[2] = max8997->buck5_vol; + buckx_gpiodvs[0] = max8997->buck1_gpiodvs; + buckx_gpiodvs[1] = max8997->buck2_gpiodvs; + buckx_gpiodvs[2] = max8997->buck5_gpiodvs; + + for (i = 0; i < 8; i++) { + int others; + + if (new_val != (buckx_val[rid])[i]) { + side_effect[i] = -1; + continue; + } + + side_effect[i] = 0; + for (others = 0; others < 3; others++) { + int diff; + + if (others == rid) + continue; + if (buckx_gpiodvs[others] == false) + continue; /* Not affected */ + diff = (buckx_val[others])[i] - + (buckx_val[others])[max8997->buck125_gpioindex]; + if (diff > 0) + side_effect[i] += diff; + else if (diff < 0) + side_effect[i] -= diff; + } + if (side_effect[i] == 0) { + *best = i; + return 0; /* NO SIDE EFFECT! Use This! */ + } + if (side_effect[i] < min_side_effect) { + min_side_effect = side_effect[i]; + *best = i; + } + } + + if (*best == -1) + return -EINVAL; + + return side_effect[*best]; +} + +/* + * For Buck 1 ~ 5 and 7. If it is not controlled by GPIO, this calls + * max8997_set_voltage_ldobuck to do the job. + */ +static int max8997_set_voltage_buck(struct regulator_dev *rdev, + int min_uV, int max_uV, unsigned *selector) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + int rid = rdev_get_id(rdev); + const struct voltage_map_desc *desc; + int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg; + bool gpio_dvs_mode = false; + + if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7) + return -EINVAL; + + switch (rid) { + case MAX8997_BUCK1: + if (max8997->buck1_gpiodvs) + gpio_dvs_mode = true; + break; + case MAX8997_BUCK2: + if (max8997->buck2_gpiodvs) + gpio_dvs_mode = true; + break; + case MAX8997_BUCK5: + if (max8997->buck5_gpiodvs) + gpio_dvs_mode = true; + break; + } + + if (!gpio_dvs_mode) + return max8997_set_voltage_ldobuck(rdev, min_uV, max_uV, + selector); + + desc = reg_voltage_map[rid]; + new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV); + if (new_val < 0) + return new_val; + + tmp_dmg = INT_MAX; + tmp_idx = -1; + tmp_val = -1; + do { + damage = max8997_assess_side_effect(rdev, new_val, &new_idx); + if (damage == 0) + goto out; + + if (tmp_dmg > damage) { + tmp_idx = new_idx; + tmp_val = new_val; + tmp_dmg = damage; + } + + new_val++; + } while (desc->min + desc->step * new_val <= desc->max); + + new_idx = tmp_idx; + new_val = tmp_val; + + if (max8997->ignore_gpiodvs_side_effect == false) + return -EINVAL; + + dev_warn(&rdev->dev, + "MAX8997 GPIO-DVS Side Effect Warning: GPIO SET: %d -> %d\n", + max8997->buck125_gpioindex, tmp_idx); + +out: + if (new_idx < 0 || new_val < 0) + return -EINVAL; + + max8997->buck125_gpioindex = new_idx; + max8997_set_gpio(max8997); + *selector = new_val; + + return 0; +} + +/* For SAFEOUT1 and SAFEOUT2 */ +static int max8997_set_voltage_safeout_sel(struct regulator_dev *rdev, + unsigned selector) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + struct i2c_client *i2c = max8997->iodev->i2c; + int rid = rdev_get_id(rdev); + int reg, shift = 0, mask, ret; + + if (rid != MAX8997_ESAFEOUT1 && rid != MAX8997_ESAFEOUT2) + return -EINVAL; + + ret = max8997_get_voltage_register(rdev, ®, &shift, &mask); + if (ret) + return ret; + + return max8997_update_reg(i2c, reg, selector << shift, mask << shift); +} + +static int max8997_reg_disable_suspend(struct regulator_dev *rdev) +{ + struct max8997_data *max8997 = rdev_get_drvdata(rdev); + struct i2c_client *i2c = max8997->iodev->i2c; + int ret, reg, mask, pattern; + int rid = rdev_get_id(rdev); + + ret = max8997_get_enable_register(rdev, ®, &mask, &pattern); + if (ret) + return ret; + + max8997_read_reg(i2c, reg, &max8997->saved_states[rid]); + + if (rid == MAX8997_LDO1 || + rid == MAX8997_LDO10 || + rid == MAX8997_LDO21) { + dev_dbg(&rdev->dev, "Conditional Power-Off for %s\n", + rdev->desc->name); + return max8997_update_reg(i2c, reg, 0x40, mask); + } + + dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n", + rdev->desc->name, max8997->saved_states[rid] & mask, + (~pattern) & mask); + return max8997_update_reg(i2c, reg, ~pattern, mask); +} + +static struct regulator_ops max8997_ldo_ops = { + .list_voltage = max8997_list_voltage, + .is_enabled = max8997_reg_is_enabled, + .enable = max8997_reg_enable, + .disable = max8997_reg_disable, + .get_voltage_sel = max8997_get_voltage_sel, + .set_voltage = max8997_set_voltage_ldobuck, + .set_suspend_disable = max8997_reg_disable_suspend, +}; + +static struct regulator_ops max8997_buck_ops = { + .list_voltage = max8997_list_voltage, + .is_enabled = max8997_reg_is_enabled, + .enable = max8997_reg_enable, + .disable = max8997_reg_disable, + .get_voltage_sel = max8997_get_voltage_sel, + .set_voltage = max8997_set_voltage_buck, + .set_voltage_time_sel = max8997_set_voltage_buck_time_sel, + .set_suspend_disable = max8997_reg_disable_suspend, +}; + +static struct regulator_ops max8997_fixedvolt_ops = { + .list_voltage = max8997_list_voltage, + .is_enabled = max8997_reg_is_enabled, + .enable = max8997_reg_enable, + .disable = max8997_reg_disable, + .set_suspend_disable = max8997_reg_disable_suspend, +}; + +static struct regulator_ops max8997_safeout_ops = { + .list_voltage = regulator_list_voltage_table, + .is_enabled = max8997_reg_is_enabled, + .enable = max8997_reg_enable, + .disable = max8997_reg_disable, + .get_voltage_sel = max8997_get_voltage_sel, + .set_voltage_sel = max8997_set_voltage_safeout_sel, + .set_suspend_disable = max8997_reg_disable_suspend, +}; + +static struct regulator_ops max8997_fixedstate_ops = { + .list_voltage = max8997_list_voltage_charger_cv, + .get_voltage_sel = max8997_get_voltage_sel, + .set_voltage = max8997_set_voltage_charger_cv, +}; + +static int max8997_set_current_limit(struct regulator_dev *rdev, + int min_uA, int max_uA) +{ + unsigned dummy; + int rid = rdev_get_id(rdev); + + if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF) + return -EINVAL; + + /* Reuse max8997_set_voltage_ldobuck to set current_limit. */ + return max8997_set_voltage_ldobuck(rdev, min_uA, max_uA, &dummy); +} + +static int max8997_get_current_limit(struct regulator_dev *rdev) +{ + int sel, rid = rdev_get_id(rdev); + + if (rid != MAX8997_CHARGER && rid != MAX8997_CHARGER_TOPOFF) + return -EINVAL; + + sel = max8997_get_voltage_sel(rdev); + if (sel < 0) + return sel; + + /* Reuse max8997_list_voltage to get current_limit. */ + return max8997_list_voltage(rdev, sel); +} + +static struct regulator_ops max8997_charger_ops = { + .is_enabled = max8997_reg_is_enabled, + .enable = max8997_reg_enable, + .disable = max8997_reg_disable, + .get_current_limit = max8997_get_current_limit, + .set_current_limit = max8997_set_current_limit, +}; + +static struct regulator_ops max8997_charger_fixedstate_ops = { + .get_current_limit = max8997_get_current_limit, + .set_current_limit = max8997_set_current_limit, +}; + +#define MAX8997_VOLTAGE_REGULATOR(_name, _ops) {\ + .name = #_name, \ + .id = MAX8997_##_name, \ + .ops = &_ops, \ + .type = REGULATOR_VOLTAGE, \ + .owner = THIS_MODULE, \ +} + +#define MAX8997_CURRENT_REGULATOR(_name, _ops) {\ + .name = #_name, \ + .id = MAX8997_##_name, \ + .ops = &_ops, \ + .type = REGULATOR_CURRENT, \ + .owner = THIS_MODULE, \ +} + +static struct regulator_desc regulators[] = { + MAX8997_VOLTAGE_REGULATOR(LDO1, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO2, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO3, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO4, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO5, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO6, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO7, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO8, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO9, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO10, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO11, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO12, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO13, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO14, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO15, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO16, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO17, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO18, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(LDO21, max8997_ldo_ops), + MAX8997_VOLTAGE_REGULATOR(BUCK1, max8997_buck_ops), + MAX8997_VOLTAGE_REGULATOR(BUCK2, max8997_buck_ops), + MAX8997_VOLTAGE_REGULATOR(BUCK3, max8997_buck_ops), + MAX8997_VOLTAGE_REGULATOR(BUCK4, max8997_buck_ops), + MAX8997_VOLTAGE_REGULATOR(BUCK5, max8997_buck_ops), + MAX8997_VOLTAGE_REGULATOR(BUCK6, max8997_fixedvolt_ops), + MAX8997_VOLTAGE_REGULATOR(BUCK7, max8997_buck_ops), + MAX8997_VOLTAGE_REGULATOR(EN32KHZ_AP, max8997_fixedvolt_ops), + MAX8997_VOLTAGE_REGULATOR(EN32KHZ_CP, max8997_fixedvolt_ops), + MAX8997_VOLTAGE_REGULATOR(ENVICHG, max8997_fixedvolt_ops), + MAX8997_VOLTAGE_REGULATOR(ESAFEOUT1, max8997_safeout_ops), + MAX8997_VOLTAGE_REGULATOR(ESAFEOUT2, max8997_safeout_ops), + MAX8997_VOLTAGE_REGULATOR(CHARGER_CV, max8997_fixedstate_ops), + MAX8997_CURRENT_REGULATOR(CHARGER, max8997_charger_ops), + MAX8997_CURRENT_REGULATOR(CHARGER_TOPOFF, + max8997_charger_fixedstate_ops), +}; + +#ifdef CONFIG_OF +static int max8997_pmic_dt_parse_dvs_gpio(struct platform_device *pdev, + struct max8997_platform_data *pdata, + struct device_node *pmic_np) +{ + int i, gpio; + + for (i = 0; i < 3; i++) { + gpio = of_get_named_gpio(pmic_np, + "max8997,pmic-buck125-dvs-gpios", i); + if (!gpio_is_valid(gpio)) { + dev_err(&pdev->dev, "invalid gpio[%d]: %d\n", i, gpio); + return -EINVAL; + } + pdata->buck125_gpios[i] = gpio; + } + return 0; +} + +static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev, + struct max8997_platform_data *pdata) +{ + struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); + struct device_node *pmic_np, *regulators_np, *reg_np; + struct max8997_regulator_data *rdata; + unsigned int i, dvs_voltage_nr = 1, ret; + + pmic_np = iodev->dev->of_node; + if (!pmic_np) { + dev_err(&pdev->dev, "could not find pmic sub-node\n"); + return -ENODEV; + } + + regulators_np = of_get_child_by_name(pmic_np, "regulators"); + if (!regulators_np) { + dev_err(&pdev->dev, "could not find regulators sub-node\n"); + return -EINVAL; + } + + /* count the number of regulators to be supported in pmic */ + pdata->num_regulators = of_get_child_count(regulators_np); + + rdata = devm_kcalloc(&pdev->dev, + pdata->num_regulators, sizeof(*rdata), + GFP_KERNEL); + if (!rdata) { + of_node_put(regulators_np); + return -ENOMEM; + } + + pdata->regulators = rdata; + for_each_child_of_node(regulators_np, reg_np) { + for (i = 0; i < ARRAY_SIZE(regulators); i++) + if (!of_node_cmp(reg_np->name, regulators[i].name)) + break; + + if (i == ARRAY_SIZE(regulators)) { + dev_warn(&pdev->dev, "don't know how to configure regulator %s\n", + reg_np->name); + continue; + } + + rdata->id = i; + rdata->initdata = of_get_regulator_init_data(&pdev->dev, + reg_np, + ®ulators[i]); + rdata->reg_node = reg_np; + rdata++; + } + of_node_put(regulators_np); + + if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL)) + pdata->buck1_gpiodvs = true; + + if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL)) + pdata->buck2_gpiodvs = true; + + if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL)) + pdata->buck5_gpiodvs = true; + + if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs || + pdata->buck5_gpiodvs) { + ret = max8997_pmic_dt_parse_dvs_gpio(pdev, pdata, pmic_np); + if (ret) + return -EINVAL; + + if (of_property_read_u32(pmic_np, + "max8997,pmic-buck125-default-dvs-idx", + &pdata->buck125_default_idx)) { + pdata->buck125_default_idx = 0; + } else { + if (pdata->buck125_default_idx >= 8) { + pdata->buck125_default_idx = 0; + dev_info(&pdev->dev, "invalid value for default dvs index, using 0 instead\n"); + } + } + + if (of_get_property(pmic_np, + "max8997,pmic-ignore-gpiodvs-side-effect", NULL)) + pdata->ignore_gpiodvs_side_effect = true; + + dvs_voltage_nr = 8; + } + + if (of_property_read_u32_array(pmic_np, + "max8997,pmic-buck1-dvs-voltage", + pdata->buck1_voltage, dvs_voltage_nr)) { + dev_err(&pdev->dev, "buck1 voltages not specified\n"); + return -EINVAL; + } + + if (of_property_read_u32_array(pmic_np, + "max8997,pmic-buck2-dvs-voltage", + pdata->buck2_voltage, dvs_voltage_nr)) { + dev_err(&pdev->dev, "buck2 voltages not specified\n"); + return -EINVAL; + } + + if (of_property_read_u32_array(pmic_np, + "max8997,pmic-buck5-dvs-voltage", + pdata->buck5_voltage, dvs_voltage_nr)) { + dev_err(&pdev->dev, "buck5 voltages not specified\n"); + return -EINVAL; + } + + return 0; +} +#else +static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev, + struct max8997_platform_data *pdata) +{ + return 0; +} +#endif /* CONFIG_OF */ + +static int max8997_pmic_probe(struct platform_device *pdev) +{ + struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); + struct max8997_platform_data *pdata = iodev->pdata; + struct regulator_config config = { }; + struct regulator_dev *rdev; + struct max8997_data *max8997; + struct i2c_client *i2c; + int i, ret, nr_dvs; + u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0; + + if (!pdata) { + dev_err(&pdev->dev, "No platform init data supplied.\n"); + return -ENODEV; + } + + if (iodev->dev->of_node) { + ret = max8997_pmic_dt_parse_pdata(pdev, pdata); + if (ret) + return ret; + } + + max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data), + GFP_KERNEL); + if (!max8997) + return -ENOMEM; + + max8997->dev = &pdev->dev; + max8997->iodev = iodev; + max8997->num_regulators = pdata->num_regulators; + platform_set_drvdata(pdev, max8997); + i2c = max8997->iodev->i2c; + + max8997->buck125_gpioindex = pdata->buck125_default_idx; + max8997->buck1_gpiodvs = pdata->buck1_gpiodvs; + max8997->buck2_gpiodvs = pdata->buck2_gpiodvs; + max8997->buck5_gpiodvs = pdata->buck5_gpiodvs; + memcpy(max8997->buck125_gpios, pdata->buck125_gpios, sizeof(int) * 3); + max8997->ignore_gpiodvs_side_effect = pdata->ignore_gpiodvs_side_effect; + + nr_dvs = (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs || + pdata->buck5_gpiodvs) ? 8 : 1; + + for (i = 0; i < nr_dvs; i++) { + max8997->buck1_vol[i] = ret = + max8997_get_voltage_proper_val( + &buck1245_voltage_map_desc, + pdata->buck1_voltage[i], + pdata->buck1_voltage[i] + + buck1245_voltage_map_desc.step); + if (ret < 0) + return ret; + + max8997->buck2_vol[i] = ret = + max8997_get_voltage_proper_val( + &buck1245_voltage_map_desc, + pdata->buck2_voltage[i], + pdata->buck2_voltage[i] + + buck1245_voltage_map_desc.step); + if (ret < 0) + return ret; + + max8997->buck5_vol[i] = ret = + max8997_get_voltage_proper_val( + &buck1245_voltage_map_desc, + pdata->buck5_voltage[i], + pdata->buck5_voltage[i] + + buck1245_voltage_map_desc.step); + if (ret < 0) + return ret; + + if (max_buck1 < max8997->buck1_vol[i]) + max_buck1 = max8997->buck1_vol[i]; + if (max_buck2 < max8997->buck2_vol[i]) + max_buck2 = max8997->buck2_vol[i]; + if (max_buck5 < max8997->buck5_vol[i]) + max_buck5 = max8997->buck5_vol[i]; + } + + /* For the safety, set max voltage before setting up */ + for (i = 0; i < 8; i++) { + max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i, + max_buck1, 0x3f); + max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i, + max_buck2, 0x3f); + max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i, + max_buck5, 0x3f); + } + + /* Initialize all the DVS related BUCK registers */ + for (i = 0; i < nr_dvs; i++) { + max8997_update_reg(i2c, MAX8997_REG_BUCK1DVS1 + i, + max8997->buck1_vol[i], + 0x3f); + max8997_update_reg(i2c, MAX8997_REG_BUCK2DVS1 + i, + max8997->buck2_vol[i], + 0x3f); + max8997_update_reg(i2c, MAX8997_REG_BUCK5DVS1 + i, + max8997->buck5_vol[i], + 0x3f); + } + + /* + * If buck 1, 2, and 5 do not care DVS GPIO settings, ignore them. + * If at least one of them cares, set gpios. + */ + if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs || + pdata->buck5_gpiodvs) { + + if (!gpio_is_valid(pdata->buck125_gpios[0]) || + !gpio_is_valid(pdata->buck125_gpios[1]) || + !gpio_is_valid(pdata->buck125_gpios[2])) { + dev_err(&pdev->dev, "GPIO NOT VALID\n"); + return -EINVAL; + } + + ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[0], + "MAX8997 SET1"); + if (ret) + return ret; + + ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[1], + "MAX8997 SET2"); + if (ret) + return ret; + + ret = devm_gpio_request(&pdev->dev, pdata->buck125_gpios[2], + "MAX8997 SET3"); + if (ret) + return ret; + + gpio_direction_output(pdata->buck125_gpios[0], + (max8997->buck125_gpioindex >> 2) + & 0x1); /* SET1 */ + gpio_direction_output(pdata->buck125_gpios[1], + (max8997->buck125_gpioindex >> 1) + & 0x1); /* SET2 */ + gpio_direction_output(pdata->buck125_gpios[2], + (max8997->buck125_gpioindex >> 0) + & 0x1); /* SET3 */ + } + + /* DVS-GPIO disabled */ + max8997_update_reg(i2c, MAX8997_REG_BUCK1CTRL, (pdata->buck1_gpiodvs) ? + (1 << 1) : (0 << 1), 1 << 1); + max8997_update_reg(i2c, MAX8997_REG_BUCK2CTRL, (pdata->buck2_gpiodvs) ? + (1 << 1) : (0 << 1), 1 << 1); + max8997_update_reg(i2c, MAX8997_REG_BUCK5CTRL, (pdata->buck5_gpiodvs) ? + (1 << 1) : (0 << 1), 1 << 1); + + /* Misc Settings */ + max8997->ramp_delay = 10; /* set 10mV/us, which is the default */ + max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9); + + for (i = 0; i < pdata->num_regulators; i++) { + const struct voltage_map_desc *desc; + int id = pdata->regulators[i].id; + + desc = reg_voltage_map[id]; + if (desc) { + regulators[id].n_voltages = + (desc->max - desc->min) / desc->step + 1; + } else if (id == MAX8997_ESAFEOUT1 || id == MAX8997_ESAFEOUT2) { + regulators[id].volt_table = safeoutvolt; + regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt); + } else if (id == MAX8997_CHARGER_CV) { + regulators[id].n_voltages = 16; + } + + config.dev = max8997->dev; + config.init_data = pdata->regulators[i].initdata; + config.driver_data = max8997; + config.of_node = pdata->regulators[i].reg_node; + + rdev = devm_regulator_register(&pdev->dev, ®ulators[id], + &config); + if (IS_ERR(rdev)) { + dev_err(max8997->dev, "regulator init failed for %d\n", + id); + return PTR_ERR(rdev); + } + } + + return 0; +} + +static const struct platform_device_id max8997_pmic_id[] = { + { "max8997-pmic", 0}, + { }, +}; +MODULE_DEVICE_TABLE(platform, max8997_pmic_id); + +static struct platform_driver max8997_pmic_driver = { + .driver = { + .name = "max8997-pmic", + }, + .probe = max8997_pmic_probe, + .id_table = max8997_pmic_id, +}; + +static int __init max8997_pmic_init(void) +{ + return platform_driver_register(&max8997_pmic_driver); +} +subsys_initcall(max8997_pmic_init); + +static void __exit max8997_pmic_cleanup(void) +{ + platform_driver_unregister(&max8997_pmic_driver); +} +module_exit(max8997_pmic_cleanup); + +MODULE_DESCRIPTION("MAXIM 8997/8966 Regulator Driver"); +MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); +MODULE_LICENSE("GPL"); |