![Lee Jones](/assets/img/avatar_default.png)
max8998_get_current_limit() is only used via the .get_current_limit, so it doesn't need to be publicly supported, or to have its own external prototype. Instead, we'll make it static. Fixes the following W=1 warning: drivers/regulator/max8998.c:418:5: warning: no previous prototype for ‘max8998_get_current_limit’ [-Wmissing-prototypes] 418 | int max8998_get_current_limit(struct regulator_dev *rdev) | ^~~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Lee Jones <lee.jones@linaro.org> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20200626065738.93412-2-lee.jones@linaro.org Signed-off-by: Mark Brown <broonie@kernel.org>
827 lines
22 KiB
C
827 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// max8998.c - Voltage regulator driver for the Maxim 8998
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//
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// Copyright (C) 2009-2010 Samsung Electronics
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// Kyungmin Park <kyungmin.park@samsung.com>
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// Marek Szyprowski <m.szyprowski@samsung.com>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/mfd/max8998.h>
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#include <linux/mfd/max8998-private.h>
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struct max8998_data {
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struct device *dev;
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struct max8998_dev *iodev;
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int num_regulators;
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u8 buck1_vol[4]; /* voltages for selection */
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u8 buck2_vol[2];
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unsigned int buck1_idx; /* index to last changed voltage */
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/* value in a set */
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unsigned int buck2_idx;
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};
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static const unsigned int charger_current_table[] = {
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90000, 380000, 475000, 550000, 570000, 600000, 700000, 800000,
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};
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static int max8998_get_enable_register(struct regulator_dev *rdev,
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int *reg, int *shift)
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{
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int ldo = rdev_get_id(rdev);
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switch (ldo) {
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case MAX8998_LDO2 ... MAX8998_LDO5:
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*reg = MAX8998_REG_ONOFF1;
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*shift = 3 - (ldo - MAX8998_LDO2);
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break;
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case MAX8998_LDO6 ... MAX8998_LDO13:
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*reg = MAX8998_REG_ONOFF2;
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*shift = 7 - (ldo - MAX8998_LDO6);
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break;
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case MAX8998_LDO14 ... MAX8998_LDO17:
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*reg = MAX8998_REG_ONOFF3;
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*shift = 7 - (ldo - MAX8998_LDO14);
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break;
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case MAX8998_BUCK1 ... MAX8998_BUCK4:
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*reg = MAX8998_REG_ONOFF1;
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*shift = 7 - (ldo - MAX8998_BUCK1);
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break;
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case MAX8998_EN32KHZ_AP ... MAX8998_ENVICHG:
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*reg = MAX8998_REG_ONOFF4;
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*shift = 7 - (ldo - MAX8998_EN32KHZ_AP);
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break;
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case MAX8998_ESAFEOUT1 ... MAX8998_ESAFEOUT2:
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*reg = MAX8998_REG_CHGR2;
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*shift = 7 - (ldo - MAX8998_ESAFEOUT1);
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break;
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case MAX8998_CHARGER:
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*reg = MAX8998_REG_CHGR2;
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*shift = 0;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct i2c_client *i2c = max8998->iodev->i2c;
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int ret, reg, shift = 8;
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u8 val;
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ret = max8998_get_enable_register(rdev, ®, &shift);
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if (ret)
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return ret;
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ret = max8998_read_reg(i2c, reg, &val);
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if (ret)
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return ret;
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return val & (1 << shift);
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}
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static int max8998_ldo_is_enabled_inverted(struct regulator_dev *rdev)
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{
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return (!max8998_ldo_is_enabled(rdev));
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}
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static int max8998_ldo_enable(struct regulator_dev *rdev)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct i2c_client *i2c = max8998->iodev->i2c;
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int reg, shift = 8, ret;
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ret = max8998_get_enable_register(rdev, ®, &shift);
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if (ret)
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return ret;
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return max8998_update_reg(i2c, reg, 1<<shift, 1<<shift);
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}
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static int max8998_ldo_disable(struct regulator_dev *rdev)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct i2c_client *i2c = max8998->iodev->i2c;
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int reg, shift = 8, ret;
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ret = max8998_get_enable_register(rdev, ®, &shift);
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if (ret)
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return ret;
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return max8998_update_reg(i2c, reg, 0, 1<<shift);
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}
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static int max8998_get_voltage_register(struct regulator_dev *rdev,
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int *_reg, int *_shift, int *_mask)
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{
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int ldo = rdev_get_id(rdev);
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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int reg, shift = 0, mask = 0xff;
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switch (ldo) {
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case MAX8998_LDO2 ... MAX8998_LDO3:
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reg = MAX8998_REG_LDO2_LDO3;
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mask = 0xf;
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if (ldo == MAX8998_LDO2)
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shift = 4;
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else
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shift = 0;
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break;
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case MAX8998_LDO4 ... MAX8998_LDO7:
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reg = MAX8998_REG_LDO4 + (ldo - MAX8998_LDO4);
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break;
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case MAX8998_LDO8 ... MAX8998_LDO9:
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reg = MAX8998_REG_LDO8_LDO9;
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mask = 0xf;
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if (ldo == MAX8998_LDO8)
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shift = 4;
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else
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shift = 0;
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break;
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case MAX8998_LDO10 ... MAX8998_LDO11:
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reg = MAX8998_REG_LDO10_LDO11;
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if (ldo == MAX8998_LDO10) {
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shift = 5;
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mask = 0x7;
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} else {
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shift = 0;
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mask = 0x1f;
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}
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break;
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case MAX8998_LDO12 ... MAX8998_LDO17:
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reg = MAX8998_REG_LDO12 + (ldo - MAX8998_LDO12);
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break;
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case MAX8998_BUCK1:
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reg = MAX8998_REG_BUCK1_VOLTAGE1 + max8998->buck1_idx;
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break;
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case MAX8998_BUCK2:
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reg = MAX8998_REG_BUCK2_VOLTAGE1 + max8998->buck2_idx;
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break;
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case MAX8998_BUCK3:
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reg = MAX8998_REG_BUCK3;
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break;
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case MAX8998_BUCK4:
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reg = MAX8998_REG_BUCK4;
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break;
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default:
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return -EINVAL;
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}
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*_reg = reg;
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*_shift = shift;
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*_mask = mask;
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return 0;
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}
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static int max8998_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct i2c_client *i2c = max8998->iodev->i2c;
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int reg, shift = 0, mask, ret;
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u8 val;
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ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
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if (ret)
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return ret;
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ret = max8998_read_reg(i2c, reg, &val);
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if (ret)
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return ret;
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val >>= shift;
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val &= mask;
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return val;
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}
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static int max8998_set_voltage_ldo_sel(struct regulator_dev *rdev,
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unsigned selector)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct i2c_client *i2c = max8998->iodev->i2c;
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int reg, shift = 0, mask, ret;
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ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
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if (ret)
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return ret;
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ret = max8998_update_reg(i2c, reg, selector<<shift, mask<<shift);
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return ret;
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}
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static inline void buck1_gpio_set(int gpio1, int gpio2, int v)
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{
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gpio_set_value(gpio1, v & 0x1);
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gpio_set_value(gpio2, (v >> 1) & 0x1);
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}
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static inline void buck2_gpio_set(int gpio, int v)
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{
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gpio_set_value(gpio, v & 0x1);
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}
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static int max8998_set_voltage_buck_sel(struct regulator_dev *rdev,
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unsigned selector)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct max8998_platform_data *pdata = max8998->iodev->pdata;
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struct i2c_client *i2c = max8998->iodev->i2c;
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int buck = rdev_get_id(rdev);
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int reg, shift = 0, mask, ret, j;
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static u8 buck1_last_val;
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ret = max8998_get_voltage_register(rdev, ®, &shift, &mask);
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if (ret)
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return ret;
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switch (buck) {
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case MAX8998_BUCK1:
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dev_dbg(max8998->dev,
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"BUCK1, selector:%d, buck1_vol1:%d, buck1_vol2:%d\n"
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"buck1_vol3:%d, buck1_vol4:%d\n",
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selector, max8998->buck1_vol[0], max8998->buck1_vol[1],
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max8998->buck1_vol[2], max8998->buck1_vol[3]);
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if (gpio_is_valid(pdata->buck1_set1) &&
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gpio_is_valid(pdata->buck1_set2)) {
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/* check if requested voltage */
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/* value is already defined */
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for (j = 0; j < ARRAY_SIZE(max8998->buck1_vol); j++) {
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if (max8998->buck1_vol[j] == selector) {
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max8998->buck1_idx = j;
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buck1_gpio_set(pdata->buck1_set1,
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pdata->buck1_set2, j);
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goto buck1_exit;
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}
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}
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if (pdata->buck_voltage_lock)
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return -EINVAL;
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/* no predefine regulator found */
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max8998->buck1_idx = (buck1_last_val % 2) + 2;
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dev_dbg(max8998->dev, "max8998->buck1_idx:%d\n",
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max8998->buck1_idx);
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max8998->buck1_vol[max8998->buck1_idx] = selector;
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ret = max8998_get_voltage_register(rdev, ®,
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&shift,
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&mask);
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ret = max8998_write_reg(i2c, reg, selector);
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buck1_gpio_set(pdata->buck1_set1,
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pdata->buck1_set2, max8998->buck1_idx);
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buck1_last_val++;
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buck1_exit:
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dev_dbg(max8998->dev, "%s: SET1:%d, SET2:%d\n",
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i2c->name, gpio_get_value(pdata->buck1_set1),
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gpio_get_value(pdata->buck1_set2));
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break;
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} else {
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ret = max8998_write_reg(i2c, reg, selector);
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}
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break;
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case MAX8998_BUCK2:
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dev_dbg(max8998->dev,
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"BUCK2, selector:%d buck2_vol1:%d, buck2_vol2:%d\n",
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selector, max8998->buck2_vol[0], max8998->buck2_vol[1]);
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if (gpio_is_valid(pdata->buck2_set3)) {
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/* check if requested voltage */
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/* value is already defined */
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for (j = 0; j < ARRAY_SIZE(max8998->buck2_vol); j++) {
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if (max8998->buck2_vol[j] == selector) {
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max8998->buck2_idx = j;
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buck2_gpio_set(pdata->buck2_set3, j);
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goto buck2_exit;
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}
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}
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if (pdata->buck_voltage_lock)
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return -EINVAL;
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max8998_get_voltage_register(rdev,
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®, &shift, &mask);
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ret = max8998_write_reg(i2c, reg, selector);
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max8998->buck2_vol[max8998->buck2_idx] = selector;
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buck2_gpio_set(pdata->buck2_set3, max8998->buck2_idx);
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buck2_exit:
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dev_dbg(max8998->dev, "%s: SET3:%d\n", i2c->name,
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gpio_get_value(pdata->buck2_set3));
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} else {
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ret = max8998_write_reg(i2c, reg, selector);
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}
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break;
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case MAX8998_BUCK3:
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case MAX8998_BUCK4:
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ret = max8998_update_reg(i2c, reg, selector<<shift,
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mask<<shift);
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break;
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}
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return ret;
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}
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static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
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unsigned int old_selector,
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unsigned int new_selector)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct i2c_client *i2c = max8998->iodev->i2c;
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int buck = rdev_get_id(rdev);
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u8 val = 0;
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int difference, ret;
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if (buck < MAX8998_BUCK1 || buck > MAX8998_BUCK4)
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return -EINVAL;
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/* Voltage stabilization */
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ret = max8998_read_reg(i2c, MAX8998_REG_ONOFF4, &val);
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if (ret)
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return ret;
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/* lp3974 hasn't got ENRAMP bit - ramp is assumed as true */
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/* MAX8998 has ENRAMP bit implemented, so test it*/
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if (max8998->iodev->type == TYPE_MAX8998 && !(val & MAX8998_ENRAMP))
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return 0;
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difference = (new_selector - old_selector) * rdev->desc->uV_step / 1000;
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if (difference > 0)
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return DIV_ROUND_UP(difference, (val & 0x0f) + 1);
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return 0;
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}
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static int max8998_set_current_limit(struct regulator_dev *rdev,
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int min_uA, int max_uA)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct i2c_client *i2c = max8998->iodev->i2c;
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unsigned int n_currents = rdev->desc->n_current_limits;
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int i, sel = -1;
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if (n_currents == 0)
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return -EINVAL;
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if (rdev->desc->curr_table) {
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const unsigned int *curr_table = rdev->desc->curr_table;
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bool ascend = curr_table[n_currents - 1] > curr_table[0];
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/* search for closest to maximum */
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if (ascend) {
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for (i = n_currents - 1; i >= 0; i--) {
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if (min_uA <= curr_table[i] &&
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curr_table[i] <= max_uA) {
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sel = i;
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break;
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}
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}
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} else {
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for (i = 0; i < n_currents; i++) {
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if (min_uA <= curr_table[i] &&
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curr_table[i] <= max_uA) {
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sel = i;
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break;
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}
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}
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}
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}
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if (sel < 0)
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return -EINVAL;
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sel <<= ffs(rdev->desc->csel_mask) - 1;
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return max8998_update_reg(i2c, rdev->desc->csel_reg,
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sel, rdev->desc->csel_mask);
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}
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static int max8998_get_current_limit(struct regulator_dev *rdev)
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{
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struct max8998_data *max8998 = rdev_get_drvdata(rdev);
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struct i2c_client *i2c = max8998->iodev->i2c;
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u8 val;
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int ret;
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ret = max8998_read_reg(i2c, rdev->desc->csel_reg, &val);
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if (ret != 0)
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return ret;
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val &= rdev->desc->csel_mask;
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val >>= ffs(rdev->desc->csel_mask) - 1;
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if (rdev->desc->curr_table) {
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if (val >= rdev->desc->n_current_limits)
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return -EINVAL;
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return rdev->desc->curr_table[val];
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}
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return -EINVAL;
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}
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static const struct regulator_ops max8998_ldo_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.is_enabled = max8998_ldo_is_enabled,
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.enable = max8998_ldo_enable,
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.disable = max8998_ldo_disable,
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.get_voltage_sel = max8998_get_voltage_sel,
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.set_voltage_sel = max8998_set_voltage_ldo_sel,
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};
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static const struct regulator_ops max8998_buck_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.is_enabled = max8998_ldo_is_enabled,
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.enable = max8998_ldo_enable,
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.disable = max8998_ldo_disable,
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.get_voltage_sel = max8998_get_voltage_sel,
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.set_voltage_sel = max8998_set_voltage_buck_sel,
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.set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
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};
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static const struct regulator_ops max8998_charger_ops = {
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.set_current_limit = max8998_set_current_limit,
|
|
.get_current_limit = max8998_get_current_limit,
|
|
.is_enabled = max8998_ldo_is_enabled_inverted,
|
|
/* Swapped as register is inverted */
|
|
.enable = max8998_ldo_disable,
|
|
.disable = max8998_ldo_enable,
|
|
};
|
|
|
|
static const struct regulator_ops max8998_others_ops = {
|
|
.is_enabled = max8998_ldo_is_enabled,
|
|
.enable = max8998_ldo_enable,
|
|
.disable = max8998_ldo_disable,
|
|
};
|
|
|
|
#define MAX8998_LINEAR_REG(_name, _ops, _min, _step, _max) \
|
|
{ \
|
|
.name = #_name, \
|
|
.id = MAX8998_##_name, \
|
|
.ops = _ops, \
|
|
.min_uV = (_min), \
|
|
.uV_step = (_step), \
|
|
.n_voltages = ((_max) - (_min)) / (_step) + 1, \
|
|
.type = REGULATOR_VOLTAGE, \
|
|
.owner = THIS_MODULE, \
|
|
}
|
|
|
|
#define MAX8998_CURRENT_REG(_name, _ops, _table, _reg, _mask) \
|
|
{ \
|
|
.name = #_name, \
|
|
.id = MAX8998_##_name, \
|
|
.ops = _ops, \
|
|
.curr_table = _table, \
|
|
.n_current_limits = ARRAY_SIZE(_table), \
|
|
.csel_reg = _reg, \
|
|
.csel_mask = _mask, \
|
|
.type = REGULATOR_CURRENT, \
|
|
.owner = THIS_MODULE, \
|
|
}
|
|
|
|
#define MAX8998_OTHERS_REG(_name, _id) \
|
|
{ \
|
|
.name = #_name, \
|
|
.id = _id, \
|
|
.ops = &max8998_others_ops, \
|
|
.type = REGULATOR_VOLTAGE, \
|
|
.owner = THIS_MODULE, \
|
|
}
|
|
|
|
static const struct regulator_desc regulators[] = {
|
|
MAX8998_LINEAR_REG(LDO2, &max8998_ldo_ops, 800000, 50000, 1300000),
|
|
MAX8998_LINEAR_REG(LDO3, &max8998_ldo_ops, 800000, 50000, 1300000),
|
|
MAX8998_LINEAR_REG(LDO4, &max8998_ldo_ops, 1600000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(LDO5, &max8998_ldo_ops, 1600000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(LDO6, &max8998_ldo_ops, 1600000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(LDO7, &max8998_ldo_ops, 1600000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(LDO8, &max8998_ldo_ops, 3000000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(LDO9, &max8998_ldo_ops, 2800000, 100000, 3100000),
|
|
MAX8998_LINEAR_REG(LDO10, &max8998_ldo_ops, 950000, 50000, 1300000),
|
|
MAX8998_LINEAR_REG(LDO11, &max8998_ldo_ops, 1600000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(LDO12, &max8998_ldo_ops, 800000, 100000, 3300000),
|
|
MAX8998_LINEAR_REG(LDO13, &max8998_ldo_ops, 800000, 100000, 3300000),
|
|
MAX8998_LINEAR_REG(LDO14, &max8998_ldo_ops, 1200000, 100000, 3300000),
|
|
MAX8998_LINEAR_REG(LDO15, &max8998_ldo_ops, 1200000, 100000, 3300000),
|
|
MAX8998_LINEAR_REG(LDO16, &max8998_ldo_ops, 1600000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(LDO17, &max8998_ldo_ops, 1600000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(BUCK1, &max8998_buck_ops, 750000, 25000, 1525000),
|
|
MAX8998_LINEAR_REG(BUCK2, &max8998_buck_ops, 750000, 25000, 1525000),
|
|
MAX8998_LINEAR_REG(BUCK3, &max8998_buck_ops, 1600000, 100000, 3600000),
|
|
MAX8998_LINEAR_REG(BUCK4, &max8998_buck_ops, 800000, 100000, 2300000),
|
|
MAX8998_OTHERS_REG(EN32KHz-AP, MAX8998_EN32KHZ_AP),
|
|
MAX8998_OTHERS_REG(EN32KHz-CP, MAX8998_EN32KHZ_CP),
|
|
MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
|
|
MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
|
|
MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
|
|
MAX8998_CURRENT_REG(CHARGER, &max8998_charger_ops,
|
|
charger_current_table, MAX8998_REG_CHGR1, 0x7),
|
|
};
|
|
|
|
static int max8998_pmic_dt_parse_dvs_gpio(struct max8998_dev *iodev,
|
|
struct max8998_platform_data *pdata,
|
|
struct device_node *pmic_np)
|
|
{
|
|
int gpio;
|
|
|
|
gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 0);
|
|
if (!gpio_is_valid(gpio)) {
|
|
dev_err(iodev->dev, "invalid buck1 gpio[0]: %d\n", gpio);
|
|
return -EINVAL;
|
|
}
|
|
pdata->buck1_set1 = gpio;
|
|
|
|
gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck1-dvs-gpios", 1);
|
|
if (!gpio_is_valid(gpio)) {
|
|
dev_err(iodev->dev, "invalid buck1 gpio[1]: %d\n", gpio);
|
|
return -EINVAL;
|
|
}
|
|
pdata->buck1_set2 = gpio;
|
|
|
|
gpio = of_get_named_gpio(pmic_np, "max8998,pmic-buck2-dvs-gpio", 0);
|
|
if (!gpio_is_valid(gpio)) {
|
|
dev_err(iodev->dev, "invalid buck 2 gpio: %d\n", gpio);
|
|
return -EINVAL;
|
|
}
|
|
pdata->buck2_set3 = gpio;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max8998_pmic_dt_parse_pdata(struct max8998_dev *iodev,
|
|
struct max8998_platform_data *pdata)
|
|
{
|
|
struct device_node *pmic_np = iodev->dev->of_node;
|
|
struct device_node *regulators_np, *reg_np;
|
|
struct max8998_regulator_data *rdata;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
regulators_np = of_get_child_by_name(pmic_np, "regulators");
|
|
if (!regulators_np) {
|
|
dev_err(iodev->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(iodev->dev,
|
|
pdata->num_regulators, sizeof(*rdata),
|
|
GFP_KERNEL);
|
|
if (!rdata) {
|
|
of_node_put(regulators_np);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pdata->regulators = rdata;
|
|
for (i = 0; i < ARRAY_SIZE(regulators); ++i) {
|
|
reg_np = of_get_child_by_name(regulators_np,
|
|
regulators[i].name);
|
|
if (!reg_np)
|
|
continue;
|
|
|
|
rdata->id = regulators[i].id;
|
|
rdata->initdata = of_get_regulator_init_data(iodev->dev,
|
|
reg_np,
|
|
®ulators[i]);
|
|
rdata->reg_node = reg_np;
|
|
++rdata;
|
|
}
|
|
pdata->num_regulators = rdata - pdata->regulators;
|
|
|
|
of_node_put(reg_np);
|
|
of_node_put(regulators_np);
|
|
|
|
ret = max8998_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
if (of_find_property(pmic_np, "max8998,pmic-buck-voltage-lock", NULL))
|
|
pdata->buck_voltage_lock = true;
|
|
|
|
ret = of_property_read_u32(pmic_np,
|
|
"max8998,pmic-buck1-default-dvs-idx",
|
|
&pdata->buck1_default_idx);
|
|
if (!ret && pdata->buck1_default_idx >= 4) {
|
|
pdata->buck1_default_idx = 0;
|
|
dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
|
|
}
|
|
|
|
ret = of_property_read_u32(pmic_np,
|
|
"max8998,pmic-buck2-default-dvs-idx",
|
|
&pdata->buck2_default_idx);
|
|
if (!ret && pdata->buck2_default_idx >= 2) {
|
|
pdata->buck2_default_idx = 0;
|
|
dev_warn(iodev->dev, "invalid value for default dvs index, using 0 instead\n");
|
|
}
|
|
|
|
ret = of_property_read_u32_array(pmic_np,
|
|
"max8998,pmic-buck1-dvs-voltage",
|
|
pdata->buck1_voltage,
|
|
ARRAY_SIZE(pdata->buck1_voltage));
|
|
if (ret) {
|
|
dev_err(iodev->dev, "buck1 voltages not specified\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = of_property_read_u32_array(pmic_np,
|
|
"max8998,pmic-buck2-dvs-voltage",
|
|
pdata->buck2_voltage,
|
|
ARRAY_SIZE(pdata->buck2_voltage));
|
|
if (ret) {
|
|
dev_err(iodev->dev, "buck2 voltages not specified\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max8998_pmic_probe(struct platform_device *pdev)
|
|
{
|
|
struct max8998_dev *iodev = dev_get_drvdata(pdev->dev.parent);
|
|
struct max8998_platform_data *pdata = iodev->pdata;
|
|
struct regulator_config config = { };
|
|
struct regulator_dev *rdev;
|
|
struct max8998_data *max8998;
|
|
struct i2c_client *i2c;
|
|
int i, ret;
|
|
unsigned int v;
|
|
|
|
if (!pdata) {
|
|
dev_err(pdev->dev.parent, "No platform init data supplied\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (IS_ENABLED(CONFIG_OF) && iodev->dev->of_node) {
|
|
ret = max8998_pmic_dt_parse_pdata(iodev, pdata);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
max8998 = devm_kzalloc(&pdev->dev, sizeof(struct max8998_data),
|
|
GFP_KERNEL);
|
|
if (!max8998)
|
|
return -ENOMEM;
|
|
|
|
max8998->dev = &pdev->dev;
|
|
max8998->iodev = iodev;
|
|
max8998->num_regulators = pdata->num_regulators;
|
|
platform_set_drvdata(pdev, max8998);
|
|
i2c = max8998->iodev->i2c;
|
|
|
|
max8998->buck1_idx = pdata->buck1_default_idx;
|
|
max8998->buck2_idx = pdata->buck2_default_idx;
|
|
|
|
/* NOTE: */
|
|
/* For unused GPIO NOT marked as -1 (thereof equal to 0) WARN_ON */
|
|
/* will be displayed */
|
|
|
|
/* Check if MAX8998 voltage selection GPIOs are defined */
|
|
if (gpio_is_valid(pdata->buck1_set1) &&
|
|
gpio_is_valid(pdata->buck1_set2)) {
|
|
/* Check if SET1 is not equal to 0 */
|
|
if (!pdata->buck1_set1) {
|
|
dev_err(&pdev->dev,
|
|
"MAX8998 SET1 GPIO defined as 0 !\n");
|
|
WARN_ON(!pdata->buck1_set1);
|
|
return -EIO;
|
|
}
|
|
/* Check if SET2 is not equal to 0 */
|
|
if (!pdata->buck1_set2) {
|
|
dev_err(&pdev->dev,
|
|
"MAX8998 SET2 GPIO defined as 0 !\n");
|
|
WARN_ON(!pdata->buck1_set2);
|
|
return -EIO;
|
|
}
|
|
|
|
gpio_request(pdata->buck1_set1, "MAX8998 BUCK1_SET1");
|
|
gpio_direction_output(pdata->buck1_set1,
|
|
max8998->buck1_idx & 0x1);
|
|
|
|
|
|
gpio_request(pdata->buck1_set2, "MAX8998 BUCK1_SET2");
|
|
gpio_direction_output(pdata->buck1_set2,
|
|
(max8998->buck1_idx >> 1) & 0x1);
|
|
|
|
/* Set predefined values for BUCK1 registers */
|
|
for (v = 0; v < ARRAY_SIZE(pdata->buck1_voltage); ++v) {
|
|
int index = MAX8998_BUCK1 - MAX8998_LDO2;
|
|
|
|
i = 0;
|
|
while (regulators[index].min_uV +
|
|
regulators[index].uV_step * i
|
|
< pdata->buck1_voltage[v])
|
|
i++;
|
|
|
|
max8998->buck1_vol[v] = i;
|
|
ret = max8998_write_reg(i2c,
|
|
MAX8998_REG_BUCK1_VOLTAGE1 + v, i);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (gpio_is_valid(pdata->buck2_set3)) {
|
|
/* Check if SET3 is not equal to 0 */
|
|
if (!pdata->buck2_set3) {
|
|
dev_err(&pdev->dev,
|
|
"MAX8998 SET3 GPIO defined as 0 !\n");
|
|
WARN_ON(!pdata->buck2_set3);
|
|
return -EIO;
|
|
}
|
|
gpio_request(pdata->buck2_set3, "MAX8998 BUCK2_SET3");
|
|
gpio_direction_output(pdata->buck2_set3,
|
|
max8998->buck2_idx & 0x1);
|
|
|
|
/* Set predefined values for BUCK2 registers */
|
|
for (v = 0; v < ARRAY_SIZE(pdata->buck2_voltage); ++v) {
|
|
int index = MAX8998_BUCK2 - MAX8998_LDO2;
|
|
|
|
i = 0;
|
|
while (regulators[index].min_uV +
|
|
regulators[index].uV_step * i
|
|
< pdata->buck2_voltage[v])
|
|
i++;
|
|
|
|
max8998->buck2_vol[v] = i;
|
|
ret = max8998_write_reg(i2c,
|
|
MAX8998_REG_BUCK2_VOLTAGE1 + v, i);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < pdata->num_regulators; i++) {
|
|
int index = pdata->regulators[i].id - MAX8998_LDO2;
|
|
|
|
config.dev = max8998->dev;
|
|
config.of_node = pdata->regulators[i].reg_node;
|
|
config.init_data = pdata->regulators[i].initdata;
|
|
config.driver_data = max8998;
|
|
|
|
rdev = devm_regulator_register(&pdev->dev, ®ulators[index],
|
|
&config);
|
|
if (IS_ERR(rdev)) {
|
|
ret = PTR_ERR(rdev);
|
|
dev_err(max8998->dev, "regulator %s init failed (%d)\n",
|
|
regulators[index].name, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id max8998_pmic_id[] = {
|
|
{ "max8998-pmic", TYPE_MAX8998 },
|
|
{ "lp3974-pmic", TYPE_LP3974 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, max8998_pmic_id);
|
|
|
|
static struct platform_driver max8998_pmic_driver = {
|
|
.driver = {
|
|
.name = "max8998-pmic",
|
|
},
|
|
.probe = max8998_pmic_probe,
|
|
.id_table = max8998_pmic_id,
|
|
};
|
|
|
|
static int __init max8998_pmic_init(void)
|
|
{
|
|
return platform_driver_register(&max8998_pmic_driver);
|
|
}
|
|
subsys_initcall(max8998_pmic_init);
|
|
|
|
static void __exit max8998_pmic_cleanup(void)
|
|
{
|
|
platform_driver_unregister(&max8998_pmic_driver);
|
|
}
|
|
module_exit(max8998_pmic_cleanup);
|
|
|
|
MODULE_DESCRIPTION("MAXIM 8998 voltage regulator driver");
|
|
MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
|
|
MODULE_LICENSE("GPL");
|