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The commit9bf448c66d("ARM: pxa: use generic gpio operation instead of gpio register") from Oct 17, 2011, leads to the following static checker warning: arch/arm/mach-pxa/spitz_pm.c:172 spitz_charger_wakeup() warn: double left shift '!gpio_get_value(SPITZ_GPIO_KEY_INT) << (1 << ((SPITZ_GPIO_KEY_INT) & 31))' As Dan reported, the value is shifted three times : - once by gpio_get_value(), which returns either 0 or BIT(gpio) - once by the shift operation '<<' - a last time by GPIO_bit(gpio) which is BIT(gpio) Therefore the calculation lead to a chained or operator of : - (1 << gpio) << (1 << gpio) = (2^gpio)^gpio = 2 ^ (gpio * gpio) It is be sheer luck the former statement works, only because each gpio used is strictly smaller than 6, and therefore 2^(gpio^2) never overflows a 32 bits value, and because it is used as a boolean value to check a gpio activation. As the xxx_charger_wakeup() functions are used as a true/false detection mechanism, take that opportunity to change their prototypes from integer return value to boolean one. Fixes:9bf448c66d("ARM: pxa: use generic gpio operation instead of gpio register") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Joe Perches <joe@perches.com> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/*
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* SharpSL Battery/PM Driver
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*
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* Copyright (c) 2004-2005 Richard Purdie
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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 version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef _MACH_SHARPSL_PM
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#define _MACH_SHARPSL_PM
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struct sharpsl_charger_machinfo {
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void (*init)(void);
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void (*exit)(void);
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int gpio_acin;
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int gpio_batfull;
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int batfull_irq;
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int gpio_batlock;
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int gpio_fatal;
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void (*discharge)(int);
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void (*discharge1)(int);
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void (*charge)(int);
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void (*measure_temp)(int);
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void (*presuspend)(void);
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void (*postsuspend)(void);
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void (*earlyresume)(void);
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unsigned long (*read_devdata)(int);
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#define SHARPSL_BATT_VOLT 1
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#define SHARPSL_BATT_TEMP 2
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#define SHARPSL_ACIN_VOLT 3
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#define SHARPSL_STATUS_ACIN 4
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#define SHARPSL_STATUS_LOCK 5
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#define SHARPSL_STATUS_CHRGFULL 6
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#define SHARPSL_STATUS_FATAL 7
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bool (*charger_wakeup)(void);
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int (*should_wakeup)(unsigned int resume_on_alarm);
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void (*backlight_limit)(int);
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int (*backlight_get_status) (void);
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int charge_on_volt;
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int charge_on_temp;
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int charge_acin_high;
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int charge_acin_low;
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int fatal_acin_volt;
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int fatal_noacin_volt;
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int bat_levels;
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struct battery_thresh *bat_levels_noac;
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struct battery_thresh *bat_levels_acin;
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struct battery_thresh *bat_levels_noac_bl;
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struct battery_thresh *bat_levels_acin_bl;
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int status_high_acin;
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int status_low_acin;
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int status_high_noac;
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int status_low_noac;
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};
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struct battery_thresh {
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int voltage;
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int percentage;
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};
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struct battery_stat {
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int ac_status; /* APM AC Present/Not Present */
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int mainbat_status; /* APM Main Battery Status */
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int mainbat_percent; /* Main Battery Percentage Charge */
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int mainbat_voltage; /* Main Battery Voltage */
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};
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struct sharpsl_pm_status {
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struct device *dev;
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struct timer_list ac_timer;
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struct timer_list chrg_full_timer;
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int charge_mode;
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#define CHRG_ERROR (-1)
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#define CHRG_OFF (0)
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#define CHRG_ON (1)
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#define CHRG_DONE (2)
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unsigned int flags;
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#define SHARPSL_SUSPENDED (1 << 0) /* Device is Suspended */
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#define SHARPSL_ALARM_ACTIVE (1 << 1) /* Alarm is for charging event (not user) */
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#define SHARPSL_BL_LIMIT (1 << 2) /* Backlight Intensity Limited */
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#define SHARPSL_APM_QUEUED (1 << 3) /* APM Event Queued */
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#define SHARPSL_DO_OFFLINE_CHRG (1 << 4) /* Trigger the offline charger */
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int full_count;
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unsigned long charge_start_time;
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struct sharpsl_charger_machinfo *machinfo;
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struct battery_stat battstat;
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};
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extern struct sharpsl_pm_status sharpsl_pm;
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extern struct battery_thresh sharpsl_battery_levels_acin[];
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extern struct battery_thresh sharpsl_battery_levels_noac[];
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#define SHARPSL_LED_ERROR 2
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#define SHARPSL_LED_ON 1
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#define SHARPSL_LED_OFF 0
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void sharpsl_battery_kick(void);
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void sharpsl_pm_led(int val);
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/* MAX1111 Channel Definitions */
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#define MAX1111_BATT_VOLT 4u
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#define MAX1111_BATT_TEMP 2u
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#define MAX1111_ACIN_VOLT 6u
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int sharpsl_pm_pxa_read_max1111(int channel);
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void corgi_lcd_limit_intensity(int limit);
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#endif
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