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![Colin Ian King](/assets/img/avatar_default.png)
The variable current_bits is being initialized with a value that is never read and it is being updated later with a new value. The initialization is redundant and can be removed. Addresses-Coverity: ("Unused value") Signed-off-by: Colin Ian King <colin.king@canonical.com> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
564 lines
16 KiB
C
564 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// max14577.c - mfd core driver for the Maxim 14577/77836
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//
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// Copyright (C) 2014 Samsung Electronics
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// Chanwoo Choi <cw00.choi@samsung.com>
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// Krzysztof Kozlowski <krzk@kernel.org>
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//
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// This driver is based on max8997.c
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/of_device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/max14577.h>
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#include <linux/mfd/max14577-private.h>
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/*
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* Table of valid charger currents for different Maxim chipsets.
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* It is placed here because it is used by both charger and regulator driver.
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*/
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const struct maxim_charger_current maxim_charger_currents[] = {
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[MAXIM_DEVICE_TYPE_UNKNOWN] = { 0, 0, 0, 0 },
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[MAXIM_DEVICE_TYPE_MAX14577] = {
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.min = MAX14577_CHARGER_CURRENT_LIMIT_MIN,
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.high_start = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START,
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.high_step = MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP,
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.max = MAX14577_CHARGER_CURRENT_LIMIT_MAX,
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},
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[MAXIM_DEVICE_TYPE_MAX77836] = {
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.min = MAX77836_CHARGER_CURRENT_LIMIT_MIN,
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.high_start = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START,
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.high_step = MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP,
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.max = MAX77836_CHARGER_CURRENT_LIMIT_MAX,
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},
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};
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EXPORT_SYMBOL_GPL(maxim_charger_currents);
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/*
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* maxim_charger_calc_reg_current - Calculate register value for current
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* @limits: constraints for charger, matching the MBCICHWRC register
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* @min_ua: minimal requested current, micro Amps
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* @max_ua: maximum requested current, micro Amps
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* @dst: destination to store calculated register value
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*
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* Calculates the value of MBCICHWRC (Fast Battery Charge Current) register
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* for given current and stores it under pointed 'dst'. The stored value
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* combines low bit (MBCICHWRCL) and high bits (MBCICHWRCH). It is also
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* properly shifted.
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*
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* The calculated register value matches the current which:
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* - is always between <limits.min, limits.max>;
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* - is always less or equal to max_ua;
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* - is the highest possible value;
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* - may be lower than min_ua.
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*
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* On success returns 0. On error returns -EINVAL (requested min/max current
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* is outside of given charger limits) and 'dst' is not set.
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*/
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int maxim_charger_calc_reg_current(const struct maxim_charger_current *limits,
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unsigned int min_ua, unsigned int max_ua, u8 *dst)
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{
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unsigned int current_bits;
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if (min_ua > max_ua)
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return -EINVAL;
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if (min_ua > limits->max || max_ua < limits->min)
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return -EINVAL;
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if (max_ua < limits->high_start) {
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/*
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* Less than high_start, so set the minimal current
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* (turn Low Bit off, 0 as high bits).
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*/
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*dst = 0x0;
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return 0;
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}
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/* max_ua is in range: <high_start, infinite>, cut it to limits.max */
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max_ua = min(limits->max, max_ua);
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max_ua -= limits->high_start;
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/*
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* There is no risk of overflow 'max_ua' here because:
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* - max_ua >= limits.high_start
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* - BUILD_BUG checks that 'limits' are: max >= high_start + high_step
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*/
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current_bits = max_ua / limits->high_step;
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/* Turn Low Bit on (use range <limits.high_start, limits.max>) ... */
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*dst = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
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/* and set proper High Bits */
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*dst |= current_bits << CHGCTRL4_MBCICHWRCH_SHIFT;
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return 0;
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}
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EXPORT_SYMBOL_GPL(maxim_charger_calc_reg_current);
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static const struct mfd_cell max14577_devs[] = {
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{
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.name = "max14577-muic",
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.of_compatible = "maxim,max14577-muic",
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},
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{
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.name = "max14577-regulator",
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.of_compatible = "maxim,max14577-regulator",
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},
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{
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.name = "max14577-charger",
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.of_compatible = "maxim,max14577-charger",
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},
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};
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static const struct mfd_cell max77836_devs[] = {
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{
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.name = "max77836-muic",
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.of_compatible = "maxim,max77836-muic",
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},
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{
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.name = "max77836-regulator",
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.of_compatible = "maxim,max77836-regulator",
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},
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{
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.name = "max77836-charger",
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.of_compatible = "maxim,max77836-charger",
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},
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{
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.name = "max77836-battery",
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.of_compatible = "maxim,max77836-battery",
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},
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};
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static const struct of_device_id max14577_dt_match[] = {
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{
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.compatible = "maxim,max14577",
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.data = (void *)MAXIM_DEVICE_TYPE_MAX14577,
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},
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{
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.compatible = "maxim,max77836",
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.data = (void *)MAXIM_DEVICE_TYPE_MAX77836,
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},
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{},
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};
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static bool max14577_muic_volatile_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case MAX14577_REG_INT1 ... MAX14577_REG_STATUS3:
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return true;
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default:
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break;
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}
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return false;
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}
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static bool max77836_muic_volatile_reg(struct device *dev, unsigned int reg)
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{
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/* Any max14577 volatile registers are also max77836 volatile. */
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if (max14577_muic_volatile_reg(dev, reg))
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return true;
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switch (reg) {
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case MAX77836_FG_REG_VCELL_MSB ... MAX77836_FG_REG_SOC_LSB:
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case MAX77836_FG_REG_CRATE_MSB ... MAX77836_FG_REG_CRATE_LSB:
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case MAX77836_FG_REG_STATUS_H ... MAX77836_FG_REG_STATUS_L:
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case MAX77836_PMIC_REG_INTSRC:
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case MAX77836_PMIC_REG_TOPSYS_INT:
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case MAX77836_PMIC_REG_TOPSYS_STAT:
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return true;
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default:
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break;
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}
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return false;
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}
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static const struct regmap_config max14577_muic_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = max14577_muic_volatile_reg,
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.max_register = MAX14577_REG_END,
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};
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static const struct regmap_config max77836_pmic_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_reg = max77836_muic_volatile_reg,
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.max_register = MAX77836_PMIC_REG_END,
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};
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static const struct regmap_irq max14577_irqs[] = {
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/* INT1 interrupts */
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{ .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
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{ .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
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{ .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
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/* INT2 interrupts */
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{ .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
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{ .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
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{ .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
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{ .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
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{ .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
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/* INT3 interrupts */
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{ .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
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{ .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
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{ .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
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{ .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
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};
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static const struct regmap_irq_chip max14577_irq_chip = {
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.name = "max14577",
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.status_base = MAX14577_REG_INT1,
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.mask_base = MAX14577_REG_INTMASK1,
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.mask_invert = true,
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.num_regs = 3,
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.irqs = max14577_irqs,
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.num_irqs = ARRAY_SIZE(max14577_irqs),
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};
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static const struct regmap_irq max77836_muic_irqs[] = {
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/* INT1 interrupts */
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{ .reg_offset = 0, .mask = MAX14577_INT1_ADC_MASK, },
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{ .reg_offset = 0, .mask = MAX14577_INT1_ADCLOW_MASK, },
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{ .reg_offset = 0, .mask = MAX14577_INT1_ADCERR_MASK, },
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{ .reg_offset = 0, .mask = MAX77836_INT1_ADC1K_MASK, },
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/* INT2 interrupts */
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{ .reg_offset = 1, .mask = MAX14577_INT2_CHGTYP_MASK, },
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{ .reg_offset = 1, .mask = MAX14577_INT2_CHGDETRUN_MASK, },
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{ .reg_offset = 1, .mask = MAX14577_INT2_DCDTMR_MASK, },
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{ .reg_offset = 1, .mask = MAX14577_INT2_DBCHG_MASK, },
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{ .reg_offset = 1, .mask = MAX14577_INT2_VBVOLT_MASK, },
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{ .reg_offset = 1, .mask = MAX77836_INT2_VIDRM_MASK, },
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/* INT3 interrupts */
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{ .reg_offset = 2, .mask = MAX14577_INT3_EOC_MASK, },
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{ .reg_offset = 2, .mask = MAX14577_INT3_CGMBC_MASK, },
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{ .reg_offset = 2, .mask = MAX14577_INT3_OVP_MASK, },
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{ .reg_offset = 2, .mask = MAX14577_INT3_MBCCHGERR_MASK, },
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};
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static const struct regmap_irq_chip max77836_muic_irq_chip = {
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.name = "max77836-muic",
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.status_base = MAX14577_REG_INT1,
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.mask_base = MAX14577_REG_INTMASK1,
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.mask_invert = true,
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.num_regs = 3,
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.irqs = max77836_muic_irqs,
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.num_irqs = ARRAY_SIZE(max77836_muic_irqs),
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};
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static const struct regmap_irq max77836_pmic_irqs[] = {
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{ .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T120C_MASK, },
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{ .reg_offset = 0, .mask = MAX77836_TOPSYS_INT_T140C_MASK, },
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};
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static const struct regmap_irq_chip max77836_pmic_irq_chip = {
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.name = "max77836-pmic",
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.status_base = MAX77836_PMIC_REG_TOPSYS_INT,
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.mask_base = MAX77836_PMIC_REG_TOPSYS_INT_MASK,
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.mask_invert = false,
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.num_regs = 1,
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.irqs = max77836_pmic_irqs,
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.num_irqs = ARRAY_SIZE(max77836_pmic_irqs),
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};
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static void max14577_print_dev_type(struct max14577 *max14577)
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{
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u8 reg_data, vendor_id, device_id;
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int ret;
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ret = max14577_read_reg(max14577->regmap, MAX14577_REG_DEVICEID,
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®_data);
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if (ret) {
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dev_err(max14577->dev,
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"Failed to read DEVICEID register: %d\n", ret);
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return;
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}
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vendor_id = ((reg_data & DEVID_VENDORID_MASK) >>
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DEVID_VENDORID_SHIFT);
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device_id = ((reg_data & DEVID_DEVICEID_MASK) >>
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DEVID_DEVICEID_SHIFT);
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dev_info(max14577->dev, "Device type: %u (ID: 0x%x, vendor: 0x%x)\n",
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max14577->dev_type, device_id, vendor_id);
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}
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/*
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* Max77836 specific initialization code for driver probe.
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* Adds new I2C dummy device, regmap and regmap IRQ chip.
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* Unmasks Interrupt Source register.
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*
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* On success returns 0.
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* On failure returns errno and reverts any changes done so far (e.g. remove
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* I2C dummy device), except masking the INT SRC register.
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*/
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static int max77836_init(struct max14577 *max14577)
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{
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int ret;
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u8 intsrc_mask;
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max14577->i2c_pmic = i2c_new_dummy_device(max14577->i2c->adapter,
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I2C_ADDR_PMIC);
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if (IS_ERR(max14577->i2c_pmic)) {
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dev_err(max14577->dev, "Failed to register PMIC I2C device\n");
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return PTR_ERR(max14577->i2c_pmic);
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}
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i2c_set_clientdata(max14577->i2c_pmic, max14577);
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max14577->regmap_pmic = devm_regmap_init_i2c(max14577->i2c_pmic,
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&max77836_pmic_regmap_config);
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if (IS_ERR(max14577->regmap_pmic)) {
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ret = PTR_ERR(max14577->regmap_pmic);
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dev_err(max14577->dev, "Failed to allocate PMIC register map: %d\n",
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ret);
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goto err;
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}
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/* Un-mask MAX77836 Interrupt Source register */
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ret = max14577_read_reg(max14577->regmap_pmic,
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MAX77836_PMIC_REG_INTSRC_MASK, &intsrc_mask);
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if (ret < 0) {
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dev_err(max14577->dev, "Failed to read PMIC register\n");
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goto err;
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}
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intsrc_mask &= ~(MAX77836_INTSRC_MASK_TOP_INT_MASK);
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intsrc_mask &= ~(MAX77836_INTSRC_MASK_MUIC_CHG_INT_MASK);
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ret = max14577_write_reg(max14577->regmap_pmic,
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MAX77836_PMIC_REG_INTSRC_MASK, intsrc_mask);
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if (ret < 0) {
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dev_err(max14577->dev, "Failed to write PMIC register\n");
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goto err;
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}
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ret = regmap_add_irq_chip(max14577->regmap_pmic, max14577->irq,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED,
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0, &max77836_pmic_irq_chip,
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&max14577->irq_data_pmic);
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if (ret != 0) {
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dev_err(max14577->dev, "Failed to request PMIC IRQ %d: %d\n",
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max14577->irq, ret);
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goto err;
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}
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return 0;
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err:
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i2c_unregister_device(max14577->i2c_pmic);
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return ret;
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}
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/*
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* Max77836 specific de-initialization code for driver remove.
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*/
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static void max77836_remove(struct max14577 *max14577)
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{
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regmap_del_irq_chip(max14577->irq, max14577->irq_data_pmic);
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i2c_unregister_device(max14577->i2c_pmic);
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}
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static int max14577_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct max14577 *max14577;
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struct max14577_platform_data *pdata = dev_get_platdata(&i2c->dev);
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struct device_node *np = i2c->dev.of_node;
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int ret = 0;
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const struct regmap_irq_chip *irq_chip;
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const struct mfd_cell *mfd_devs;
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unsigned int mfd_devs_size;
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int irq_flags;
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if (np) {
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pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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i2c->dev.platform_data = pdata;
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}
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if (!pdata) {
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dev_err(&i2c->dev, "No platform data found.\n");
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return -EINVAL;
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}
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max14577 = devm_kzalloc(&i2c->dev, sizeof(*max14577), GFP_KERNEL);
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if (!max14577)
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return -ENOMEM;
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i2c_set_clientdata(i2c, max14577);
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max14577->dev = &i2c->dev;
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max14577->i2c = i2c;
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max14577->irq = i2c->irq;
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max14577->regmap = devm_regmap_init_i2c(i2c,
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&max14577_muic_regmap_config);
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if (IS_ERR(max14577->regmap)) {
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ret = PTR_ERR(max14577->regmap);
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dev_err(max14577->dev, "Failed to allocate register map: %d\n",
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ret);
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return ret;
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}
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if (np) {
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const struct of_device_id *of_id;
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of_id = of_match_device(max14577_dt_match, &i2c->dev);
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if (of_id)
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max14577->dev_type =
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(enum maxim_device_type)of_id->data;
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} else {
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max14577->dev_type = id->driver_data;
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}
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max14577_print_dev_type(max14577);
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switch (max14577->dev_type) {
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case MAXIM_DEVICE_TYPE_MAX77836:
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irq_chip = &max77836_muic_irq_chip;
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mfd_devs = max77836_devs;
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mfd_devs_size = ARRAY_SIZE(max77836_devs);
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irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT | IRQF_SHARED;
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break;
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case MAXIM_DEVICE_TYPE_MAX14577:
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default:
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irq_chip = &max14577_irq_chip;
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mfd_devs = max14577_devs;
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mfd_devs_size = ARRAY_SIZE(max14577_devs);
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irq_flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;
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break;
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}
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ret = regmap_add_irq_chip(max14577->regmap, max14577->irq,
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irq_flags, 0, irq_chip,
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&max14577->irq_data);
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if (ret != 0) {
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dev_err(&i2c->dev, "Failed to request IRQ %d: %d\n",
|
|
max14577->irq, ret);
|
|
return ret;
|
|
}
|
|
|
|
/* Max77836 specific initialization code (additional regmap) */
|
|
if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836) {
|
|
ret = max77836_init(max14577);
|
|
if (ret < 0)
|
|
goto err_max77836;
|
|
}
|
|
|
|
ret = mfd_add_devices(max14577->dev, -1, mfd_devs,
|
|
mfd_devs_size, NULL, 0, NULL);
|
|
if (ret < 0)
|
|
goto err_mfd;
|
|
|
|
device_init_wakeup(max14577->dev, 1);
|
|
|
|
return 0;
|
|
|
|
err_mfd:
|
|
if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
|
|
max77836_remove(max14577);
|
|
err_max77836:
|
|
regmap_del_irq_chip(max14577->irq, max14577->irq_data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int max14577_i2c_remove(struct i2c_client *i2c)
|
|
{
|
|
struct max14577 *max14577 = i2c_get_clientdata(i2c);
|
|
|
|
mfd_remove_devices(max14577->dev);
|
|
regmap_del_irq_chip(max14577->irq, max14577->irq_data);
|
|
if (max14577->dev_type == MAXIM_DEVICE_TYPE_MAX77836)
|
|
max77836_remove(max14577);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id max14577_i2c_id[] = {
|
|
{ "max14577", MAXIM_DEVICE_TYPE_MAX14577, },
|
|
{ "max77836", MAXIM_DEVICE_TYPE_MAX77836, },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int max14577_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
struct max14577 *max14577 = i2c_get_clientdata(i2c);
|
|
|
|
if (device_may_wakeup(dev))
|
|
enable_irq_wake(max14577->irq);
|
|
/*
|
|
* MUIC IRQ must be disabled during suspend because if it happens
|
|
* while suspended it will be handled before resuming I2C.
|
|
*
|
|
* When device is woken up from suspend (e.g. by ADC change),
|
|
* an interrupt occurs before resuming I2C bus controller.
|
|
* Interrupt handler tries to read registers but this read
|
|
* will fail because I2C is still suspended.
|
|
*/
|
|
disable_irq(max14577->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int max14577_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *i2c = to_i2c_client(dev);
|
|
struct max14577 *max14577 = i2c_get_clientdata(i2c);
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(max14577->irq);
|
|
enable_irq(max14577->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static SIMPLE_DEV_PM_OPS(max14577_pm, max14577_suspend, max14577_resume);
|
|
|
|
static struct i2c_driver max14577_i2c_driver = {
|
|
.driver = {
|
|
.name = "max14577",
|
|
.pm = &max14577_pm,
|
|
.of_match_table = max14577_dt_match,
|
|
},
|
|
.probe = max14577_i2c_probe,
|
|
.remove = max14577_i2c_remove,
|
|
.id_table = max14577_i2c_id,
|
|
};
|
|
|
|
static int __init max14577_i2c_init(void)
|
|
{
|
|
BUILD_BUG_ON(ARRAY_SIZE(max14577_i2c_id) != MAXIM_DEVICE_TYPE_NUM);
|
|
BUILD_BUG_ON(ARRAY_SIZE(max14577_dt_match) != MAXIM_DEVICE_TYPE_NUM);
|
|
|
|
/* Valid charger current values must be provided for each chipset */
|
|
BUILD_BUG_ON(ARRAY_SIZE(maxim_charger_currents) != MAXIM_DEVICE_TYPE_NUM);
|
|
|
|
/* Check for valid values for charger */
|
|
BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START +
|
|
MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
|
|
MAX14577_CHARGER_CURRENT_LIMIT_MAX);
|
|
BUILD_BUG_ON(MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);
|
|
|
|
BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START +
|
|
MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP * 0xf !=
|
|
MAX77836_CHARGER_CURRENT_LIMIT_MAX);
|
|
BUILD_BUG_ON(MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP == 0);
|
|
|
|
return i2c_add_driver(&max14577_i2c_driver);
|
|
}
|
|
module_init(max14577_i2c_init);
|
|
|
|
static void __exit max14577_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&max14577_i2c_driver);
|
|
}
|
|
module_exit(max14577_i2c_exit);
|
|
|
|
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>, Krzysztof Kozlowski <krzk@kernel.org>");
|
|
MODULE_DESCRIPTION("Maxim 14577/77836 multi-function core driver");
|
|
MODULE_LICENSE("GPL");
|