| /* Copyright (c) 2011, Code Aurora Forum. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #ifndef __PM8XXX_PWM_H__ |
| #define __PM8XXX_PWM_H__ |
| |
| #include <linux/pwm.h> |
| |
| #define PM8XXX_PWM_DEV_NAME "pm8xxx-pwm" |
| |
| #define PM8XXX_PWM_PERIOD_MAX (327 * USEC_PER_SEC) |
| #define PM8XXX_PWM_PERIOD_MIN 7 /* micro seconds */ |
| |
| #define PM_PWM_LUT_SIZE 64 |
| #define PM_PWM_LUT_DUTY_TIME_MAX 512 /* ms */ |
| #define PM_PWM_LUT_PAUSE_MAX (7000 * PM_PWM_LUT_DUTY_TIME_MAX) |
| |
| /* Flags for Look Up Table */ |
| #define PM_PWM_LUT_LOOP 0x01 |
| #define PM_PWM_LUT_RAMP_UP 0x02 |
| #define PM_PWM_LUT_REVERSE 0x04 |
| #define PM_PWM_LUT_PAUSE_HI_EN 0x10 |
| #define PM_PWM_LUT_PAUSE_LO_EN 0x20 |
| |
| #define PM_PWM_LUT_NO_TABLE 0x100 |
| |
| /** |
| * pm8xxx_pwm_lut_config - change a PWM device configuration to use LUT |
| * @pwm: the PWM device |
| * @period_us: period in micro second |
| * @duty_pct: arrary of duty cycles in percent, like 20, 50. |
| * @duty_time_ms: time for each duty cycle in millisecond |
| * @start_idx: start index in lookup table from 0 to MAX-1 |
| * @idx_len: number of index |
| * @pause_lo: pause time in millisecond at low index |
| * @pause_hi: pause time in millisecond at high index |
| * @flags: control flags |
| */ |
| int pm8xxx_pwm_lut_config(struct pwm_device *pwm, int period_us, |
| int duty_pct[], int duty_time_ms, int start_idx, |
| int len, int pause_lo, int pause_hi, int flags); |
| |
| /** |
| * pm8xxx_pwm_lut_enable - control a PWM device to start/stop LUT ramp |
| * @pwm: the PWM device |
| * @start: to start (1), or stop (0) |
| */ |
| int pm8xxx_pwm_lut_enable(struct pwm_device *pwm, int start); |
| |
| /* Standard APIs supported */ |
| /** |
| * pwm_request - request a PWM device |
| * @pwm_id: PWM id or channel |
| * @label: the label to identify the user |
| */ |
| |
| /** |
| * pwm_free - free a PWM device |
| * @pwm: the PWM device |
| */ |
| |
| /** |
| * pwm_config - change a PWM device configuration |
| * @pwm: the PWM device |
| * @period_us: period in microsecond |
| * @duty_us: duty cycle in microsecond |
| */ |
| |
| /** |
| * pwm_enable - start a PWM output toggling |
| * @pwm: the PWM device |
| */ |
| |
| /** |
| * pwm_disable - stop a PWM output toggling |
| * @pwm: the PWM device |
| */ |
| |
| #endif /* __PM8XXX_PWM_H__ */ |