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4d3ec936f8
Expand the control-bank accessors that were implemented using macros.
This allows the definitions of these exported functions to be found more
easily and specifically avoids a W=1 compiler warning due to the
redundant brightness sanity check:
drivers/mfd/lm3533-ctrlbank.c: In function 'lm3533_ctrlbank_set_brightness':
drivers/mfd/lm3533-ctrlbank.c:98:10: warning: comparison is always false due to limited range of data type [-Wtype-limits]
98 | if (val > LM3533_##_NAME##_MAX) \
| ^
drivers/mfd/lm3533-ctrlbank.c:125:1: note: in expansion of macro 'lm3533_ctrlbank_set'
125 | lm3533_ctrlbank_set(brightness, BRIGHTNESS);
| ^~~~~~~~~~~~~~~~~~~
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* lm3533-ctrlbank.c -- LM3533 Generic Control Bank interface
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*
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* Copyright (C) 2011-2012 Texas Instruments
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*
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* Author: Johan Hovold <jhovold@gmail.com>
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/mfd/lm3533.h>
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#define LM3533_MAX_CURRENT_MIN 5000
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#define LM3533_MAX_CURRENT_MAX 29800
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#define LM3533_MAX_CURRENT_STEP 800
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#define LM3533_PWM_MAX 0x3f
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#define LM3533_REG_PWM_BASE 0x14
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#define LM3533_REG_MAX_CURRENT_BASE 0x1f
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#define LM3533_REG_CTRLBANK_ENABLE 0x27
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#define LM3533_REG_BRIGHTNESS_BASE 0x40
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static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
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{
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return base + cb->id;
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}
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int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
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{
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u8 mask;
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int ret;
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dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
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mask = 1 << cb->id;
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ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
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mask, mask);
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if (ret)
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dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
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return ret;
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}
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EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
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int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
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{
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u8 mask;
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int ret;
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dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
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mask = 1 << cb->id;
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ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
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if (ret)
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dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
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return ret;
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}
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EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
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/*
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* Full-scale current.
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*
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* imax 5000 - 29800 uA (800 uA step)
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*/
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int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
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{
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u8 reg;
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u8 val;
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int ret;
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if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
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return -EINVAL;
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val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
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reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
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ret = lm3533_write(cb->lm3533, reg, val);
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if (ret)
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dev_err(cb->dev, "failed to set max current\n");
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return ret;
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}
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EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
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int lm3533_ctrlbank_set_brightness(struct lm3533_ctrlbank *cb, u8 val)
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{
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u8 reg;
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int ret;
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reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
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ret = lm3533_write(cb->lm3533, reg, val);
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if (ret)
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dev_err(cb->dev, "failed to set brightness\n");
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return ret;
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}
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EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_brightness);
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int lm3533_ctrlbank_get_brightness(struct lm3533_ctrlbank *cb, u8 *val)
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{
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u8 reg;
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int ret;
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reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
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ret = lm3533_read(cb->lm3533, reg, val);
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if (ret)
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dev_err(cb->dev, "failed to get brightness\n");
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return ret;
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}
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EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_brightness);
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/*
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* PWM-input control mask:
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*
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* bit 5 - PWM-input enabled in Zone 4
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* bit 4 - PWM-input enabled in Zone 3
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* bit 3 - PWM-input enabled in Zone 2
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* bit 2 - PWM-input enabled in Zone 1
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* bit 1 - PWM-input enabled in Zone 0
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* bit 0 - PWM-input enabled
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*/
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int lm3533_ctrlbank_set_pwm(struct lm3533_ctrlbank *cb, u8 val)
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{
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u8 reg;
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int ret;
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if (val > LM3533_PWM_MAX)
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return -EINVAL;
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reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
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ret = lm3533_write(cb->lm3533, reg, val);
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if (ret)
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dev_err(cb->dev, "failed to set PWM mask\n");
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return ret;
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}
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EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_pwm);
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int lm3533_ctrlbank_get_pwm(struct lm3533_ctrlbank *cb, u8 *val)
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{
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u8 reg;
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int ret;
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reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
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ret = lm3533_read(cb->lm3533, reg, val);
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if (ret)
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dev_err(cb->dev, "failed to get PWM mask\n");
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return ret;
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}
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EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_pwm);
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MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
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MODULE_DESCRIPTION("LM3533 Control Bank interface");
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MODULE_LICENSE("GPL");
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