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a7b956fd38
The newly introduced as3722_i2c_suspend/resume functions are built
unconditionally, but only used when power management is enabled,
so we get a warning otherwise:
drivers/mfd/as3722.c:427:12: warning: 'as3722_i2c_suspend' defined but not used [-Wunused-function]
drivers/mfd/as3722.c:438:12: warning: 'as3722_i2c_resume' defined but not used [-Wunused-function]
This marks them both as __maybe_unused, which avoids an ugly #ifdef
and gives us best compile-time coverage. When they are unused, the
compiler will silently drop the functions from its output.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 35deff7eb2 ("mfd: as3722: Handle interrupts on suspend")
Signed-off-by: Lee Jones <lee.jones@linaro.org>
483 lines
13 KiB
C
483 lines
13 KiB
C
/*
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* Core driver for ams AS3722 PMICs
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*
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* Copyright (C) 2013 AMS AG
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* Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
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*
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* Author: Florian Lobmaier <florian.lobmaier@ams.com>
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* Author: Laxman Dewangan <ldewangan@nvidia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/as3722.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#define AS3722_DEVICE_ID 0x0C
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static const struct resource as3722_rtc_resource[] = {
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{
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.name = "as3722-rtc-alarm",
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.start = AS3722_IRQ_RTC_ALARM,
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.end = AS3722_IRQ_RTC_ALARM,
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.flags = IORESOURCE_IRQ,
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},
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};
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static const struct resource as3722_adc_resource[] = {
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{
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.name = "as3722-adc",
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.start = AS3722_IRQ_ADC,
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.end = AS3722_IRQ_ADC,
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.flags = IORESOURCE_IRQ,
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},
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};
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static const struct mfd_cell as3722_devs[] = {
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{
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.name = "as3722-pinctrl",
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},
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{
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.name = "as3722-regulator",
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},
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{
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.name = "as3722-rtc",
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.num_resources = ARRAY_SIZE(as3722_rtc_resource),
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.resources = as3722_rtc_resource,
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},
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{
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.name = "as3722-adc",
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.num_resources = ARRAY_SIZE(as3722_adc_resource),
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.resources = as3722_adc_resource,
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},
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{
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.name = "as3722-power-off",
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},
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{
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.name = "as3722-wdt",
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},
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};
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static const struct regmap_irq as3722_irqs[] = {
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/* INT1 IRQs */
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[AS3722_IRQ_LID] = {
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.mask = AS3722_INTERRUPT_MASK1_LID,
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},
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[AS3722_IRQ_ACOK] = {
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.mask = AS3722_INTERRUPT_MASK1_ACOK,
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},
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[AS3722_IRQ_ENABLE1] = {
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.mask = AS3722_INTERRUPT_MASK1_ENABLE1,
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},
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[AS3722_IRQ_OCCUR_ALARM_SD0] = {
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.mask = AS3722_INTERRUPT_MASK1_OCURR_ALARM_SD0,
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},
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[AS3722_IRQ_ONKEY_LONG_PRESS] = {
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.mask = AS3722_INTERRUPT_MASK1_ONKEY_LONG,
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},
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[AS3722_IRQ_ONKEY] = {
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.mask = AS3722_INTERRUPT_MASK1_ONKEY,
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},
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[AS3722_IRQ_OVTMP] = {
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.mask = AS3722_INTERRUPT_MASK1_OVTMP,
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},
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[AS3722_IRQ_LOWBAT] = {
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.mask = AS3722_INTERRUPT_MASK1_LOWBAT,
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},
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/* INT2 IRQs */
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[AS3722_IRQ_SD0_LV] = {
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.mask = AS3722_INTERRUPT_MASK2_SD0_LV,
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.reg_offset = 1,
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},
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[AS3722_IRQ_SD1_LV] = {
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.mask = AS3722_INTERRUPT_MASK2_SD1_LV,
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.reg_offset = 1,
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},
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[AS3722_IRQ_SD2_LV] = {
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.mask = AS3722_INTERRUPT_MASK2_SD2345_LV,
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.reg_offset = 1,
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},
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[AS3722_IRQ_PWM1_OV_PROT] = {
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.mask = AS3722_INTERRUPT_MASK2_PWM1_OV_PROT,
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.reg_offset = 1,
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},
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[AS3722_IRQ_PWM2_OV_PROT] = {
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.mask = AS3722_INTERRUPT_MASK2_PWM2_OV_PROT,
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.reg_offset = 1,
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},
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[AS3722_IRQ_ENABLE2] = {
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.mask = AS3722_INTERRUPT_MASK2_ENABLE2,
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.reg_offset = 1,
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},
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[AS3722_IRQ_SD6_LV] = {
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.mask = AS3722_INTERRUPT_MASK2_SD6_LV,
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.reg_offset = 1,
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},
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[AS3722_IRQ_RTC_REP] = {
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.mask = AS3722_INTERRUPT_MASK2_RTC_REP,
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.reg_offset = 1,
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},
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/* INT3 IRQs */
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[AS3722_IRQ_RTC_ALARM] = {
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.mask = AS3722_INTERRUPT_MASK3_RTC_ALARM,
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.reg_offset = 2,
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},
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[AS3722_IRQ_GPIO1] = {
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.mask = AS3722_INTERRUPT_MASK3_GPIO1,
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.reg_offset = 2,
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},
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[AS3722_IRQ_GPIO2] = {
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.mask = AS3722_INTERRUPT_MASK3_GPIO2,
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.reg_offset = 2,
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},
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[AS3722_IRQ_GPIO3] = {
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.mask = AS3722_INTERRUPT_MASK3_GPIO3,
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.reg_offset = 2,
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},
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[AS3722_IRQ_GPIO4] = {
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.mask = AS3722_INTERRUPT_MASK3_GPIO4,
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.reg_offset = 2,
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},
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[AS3722_IRQ_GPIO5] = {
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.mask = AS3722_INTERRUPT_MASK3_GPIO5,
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.reg_offset = 2,
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},
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[AS3722_IRQ_WATCHDOG] = {
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.mask = AS3722_INTERRUPT_MASK3_WATCHDOG,
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.reg_offset = 2,
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},
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[AS3722_IRQ_ENABLE3] = {
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.mask = AS3722_INTERRUPT_MASK3_ENABLE3,
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.reg_offset = 2,
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},
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/* INT4 IRQs */
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[AS3722_IRQ_TEMP_SD0_SHUTDOWN] = {
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.mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_SHUTDOWN,
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.reg_offset = 3,
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},
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[AS3722_IRQ_TEMP_SD1_SHUTDOWN] = {
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.mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_SHUTDOWN,
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.reg_offset = 3,
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},
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[AS3722_IRQ_TEMP_SD2_SHUTDOWN] = {
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.mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_SHUTDOWN,
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.reg_offset = 3,
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},
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[AS3722_IRQ_TEMP_SD0_ALARM] = {
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.mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_ALARM,
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.reg_offset = 3,
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},
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[AS3722_IRQ_TEMP_SD1_ALARM] = {
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.mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_ALARM,
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.reg_offset = 3,
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},
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[AS3722_IRQ_TEMP_SD6_ALARM] = {
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.mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_ALARM,
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.reg_offset = 3,
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},
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[AS3722_IRQ_OCCUR_ALARM_SD6] = {
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.mask = AS3722_INTERRUPT_MASK4_OCCUR_ALARM_SD6,
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.reg_offset = 3,
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},
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[AS3722_IRQ_ADC] = {
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.mask = AS3722_INTERRUPT_MASK4_ADC,
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.reg_offset = 3,
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},
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};
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static const struct regmap_irq_chip as3722_irq_chip = {
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.name = "as3722",
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.irqs = as3722_irqs,
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.num_irqs = ARRAY_SIZE(as3722_irqs),
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.num_regs = 4,
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.status_base = AS3722_INTERRUPT_STATUS1_REG,
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.mask_base = AS3722_INTERRUPT_MASK1_REG,
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};
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static int as3722_check_device_id(struct as3722 *as3722)
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{
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u32 val;
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int ret;
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/* Check that this is actually a AS3722 */
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ret = as3722_read(as3722, AS3722_ASIC_ID1_REG, &val);
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if (ret < 0) {
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dev_err(as3722->dev, "ASIC_ID1 read failed: %d\n", ret);
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return ret;
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}
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if (val != AS3722_DEVICE_ID) {
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dev_err(as3722->dev, "Device is not AS3722, ID is 0x%x\n", val);
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return -ENODEV;
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}
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ret = as3722_read(as3722, AS3722_ASIC_ID2_REG, &val);
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if (ret < 0) {
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dev_err(as3722->dev, "ASIC_ID2 read failed: %d\n", ret);
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return ret;
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}
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dev_info(as3722->dev, "AS3722 with revision 0x%x found\n", val);
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return 0;
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}
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static int as3722_configure_pullups(struct as3722 *as3722)
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{
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int ret;
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u32 val = 0;
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if (as3722->en_intern_int_pullup)
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val |= AS3722_INT_PULL_UP;
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if (as3722->en_intern_i2c_pullup)
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val |= AS3722_I2C_PULL_UP;
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ret = as3722_update_bits(as3722, AS3722_IOVOLTAGE_REG,
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AS3722_INT_PULL_UP | AS3722_I2C_PULL_UP, val);
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if (ret < 0)
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dev_err(as3722->dev, "IOVOLTAGE_REG update failed: %d\n", ret);
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return ret;
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}
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static const struct regmap_range as3722_readable_ranges[] = {
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regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
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regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
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regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_REG_SEQU_MOD3_REG),
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regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
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regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
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regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
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AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
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regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
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regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
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regmap_reg_range(AS3722_RTC_ACCESS_REG, AS3722_RTC_ACCESS_REG),
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regmap_reg_range(AS3722_RTC_STATUS_REG, AS3722_TEMP_STATUS_REG),
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regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC_CONFIGURATION_REG),
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regmap_reg_range(AS3722_ASIC_ID1_REG, AS3722_ASIC_ID2_REG),
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regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
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regmap_reg_range(AS3722_FUSE7_REG, AS3722_FUSE7_REG),
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};
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static const struct regmap_access_table as3722_readable_table = {
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.yes_ranges = as3722_readable_ranges,
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.n_yes_ranges = ARRAY_SIZE(as3722_readable_ranges),
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};
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static const struct regmap_range as3722_writable_ranges[] = {
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regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
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regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
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regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_GPIO_SIGNAL_OUT_REG),
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regmap_reg_range(AS3722_REG_SEQU_MOD1_REG, AS3722_REG_SEQU_MOD3_REG),
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regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
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regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
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regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
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AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
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regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
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regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
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regmap_reg_range(AS3722_INTERRUPT_MASK1_REG, AS3722_TEMP_STATUS_REG),
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regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC1_CONTROL_REG),
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regmap_reg_range(AS3722_ADC1_THRESHOLD_HI_MSB_REG,
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AS3722_ADC_CONFIGURATION_REG),
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regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
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};
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static const struct regmap_access_table as3722_writable_table = {
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.yes_ranges = as3722_writable_ranges,
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.n_yes_ranges = ARRAY_SIZE(as3722_writable_ranges),
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};
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static const struct regmap_range as3722_cacheable_ranges[] = {
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regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_LDO11_VOLTAGE_REG),
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regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_LDOCONTROL1_REG),
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};
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static const struct regmap_access_table as3722_volatile_table = {
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.no_ranges = as3722_cacheable_ranges,
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.n_no_ranges = ARRAY_SIZE(as3722_cacheable_ranges),
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};
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static const struct regmap_config as3722_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = AS3722_MAX_REGISTER,
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.cache_type = REGCACHE_RBTREE,
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.rd_table = &as3722_readable_table,
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.wr_table = &as3722_writable_table,
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.volatile_table = &as3722_volatile_table,
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};
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static int as3722_i2c_of_probe(struct i2c_client *i2c,
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struct as3722 *as3722)
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{
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struct device_node *np = i2c->dev.of_node;
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struct irq_data *irq_data;
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if (!np) {
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dev_err(&i2c->dev, "Device Tree not found\n");
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return -EINVAL;
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}
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irq_data = irq_get_irq_data(i2c->irq);
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if (!irq_data) {
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dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
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return -EINVAL;
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}
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as3722->en_intern_int_pullup = of_property_read_bool(np,
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"ams,enable-internal-int-pullup");
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as3722->en_intern_i2c_pullup = of_property_read_bool(np,
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"ams,enable-internal-i2c-pullup");
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as3722->irq_flags = irqd_get_trigger_type(irq_data);
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dev_dbg(&i2c->dev, "IRQ flags are 0x%08lx\n", as3722->irq_flags);
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return 0;
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}
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static int as3722_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 as3722 *as3722;
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unsigned long irq_flags;
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int ret;
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as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
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if (!as3722)
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return -ENOMEM;
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as3722->dev = &i2c->dev;
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as3722->chip_irq = i2c->irq;
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i2c_set_clientdata(i2c, as3722);
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ret = as3722_i2c_of_probe(i2c, as3722);
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if (ret < 0)
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return ret;
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as3722->regmap = devm_regmap_init_i2c(i2c, &as3722_regmap_config);
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if (IS_ERR(as3722->regmap)) {
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ret = PTR_ERR(as3722->regmap);
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dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
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return ret;
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}
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ret = as3722_check_device_id(as3722);
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if (ret < 0)
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return ret;
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irq_flags = as3722->irq_flags | IRQF_ONESHOT;
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ret = regmap_add_irq_chip(as3722->regmap, as3722->chip_irq,
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irq_flags, -1, &as3722_irq_chip,
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&as3722->irq_data);
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if (ret < 0) {
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dev_err(as3722->dev, "Failed to add regmap irq: %d\n", ret);
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return ret;
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}
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ret = as3722_configure_pullups(as3722);
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if (ret < 0)
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goto scrub;
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ret = mfd_add_devices(&i2c->dev, -1, as3722_devs,
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ARRAY_SIZE(as3722_devs), NULL, 0,
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regmap_irq_get_domain(as3722->irq_data));
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if (ret) {
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dev_err(as3722->dev, "Failed to add MFD devices: %d\n", ret);
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goto scrub;
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}
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device_init_wakeup(as3722->dev, true);
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dev_dbg(as3722->dev, "AS3722 core driver initialized successfully\n");
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return 0;
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scrub:
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regmap_del_irq_chip(as3722->chip_irq, as3722->irq_data);
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return ret;
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}
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static int as3722_i2c_remove(struct i2c_client *i2c)
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{
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|
struct as3722 *as3722 = i2c_get_clientdata(i2c);
|
|
|
|
mfd_remove_devices(as3722->dev);
|
|
regmap_del_irq_chip(as3722->chip_irq, as3722->irq_data);
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused as3722_i2c_suspend(struct device *dev)
|
|
{
|
|
struct as3722 *as3722 = dev_get_drvdata(dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
enable_irq_wake(as3722->chip_irq);
|
|
disable_irq(as3722->chip_irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused as3722_i2c_resume(struct device *dev)
|
|
{
|
|
struct as3722 *as3722 = dev_get_drvdata(dev);
|
|
|
|
enable_irq(as3722->chip_irq);
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(as3722->chip_irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id as3722_of_match[] = {
|
|
{ .compatible = "ams,as3722", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, as3722_of_match);
|
|
|
|
static const struct i2c_device_id as3722_i2c_id[] = {
|
|
{ "as3722", 0 },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
|
|
|
|
static const struct dev_pm_ops as3722_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(as3722_i2c_suspend, as3722_i2c_resume)
|
|
};
|
|
|
|
static struct i2c_driver as3722_i2c_driver = {
|
|
.driver = {
|
|
.name = "as3722",
|
|
.of_match_table = as3722_of_match,
|
|
.pm = &as3722_pm_ops,
|
|
},
|
|
.probe = as3722_i2c_probe,
|
|
.remove = as3722_i2c_remove,
|
|
.id_table = as3722_i2c_id,
|
|
};
|
|
|
|
module_i2c_driver(as3722_i2c_driver);
|
|
|
|
MODULE_DESCRIPTION("I2C support for AS3722 PMICs");
|
|
MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
|
|
MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
|
|
MODULE_LICENSE("GPL");
|