179 lines
4.2 KiB
C
179 lines
4.2 KiB
C
/* Copyright (c) 2012, The Linux Foundation. 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 __QPNP_PWM_H__
|
|
#define __QPNP_PWM_H__
|
|
|
|
#include <linux/pwm.h>
|
|
|
|
/* usec: 19.2M, n=6, m=0, pre=2 */
|
|
#define PM_PWM_PERIOD_MIN 7
|
|
/* 1K, n=9, m=7, pre=6 */
|
|
#define PM_PWM_PERIOD_MAX (384 * USEC_PER_SEC)
|
|
#define PM_PWM_LUT_RAMP_STEP_TIME_MAX 499
|
|
#define PM_PWM_MAX_PAUSE_CNT 8191
|
|
/*
|
|
* Formula from HSID,
|
|
* pause_time (hi/lo) = (pause_code - 1)*(duty_ms)
|
|
*/
|
|
#define PM_PWM_LUT_PAUSE_MAX \
|
|
((PM_PWM_MAX_PAUSE_CNT - 1) * PM_PWM_LUT_RAMP_STEP_TIME_MAX) /* ms */
|
|
|
|
/* 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 0x08
|
|
#define PM_PWM_LUT_PAUSE_LO_EN 0x10
|
|
|
|
#define PM_PWM_LUT_NO_TABLE 0x20
|
|
#define PM_PWM_LUT_USE_RAW_VALUE 0x40
|
|
|
|
/*
|
|
* PWM frequency/period control
|
|
*
|
|
* PWM Frequency = ClockFrequency / (N * T)
|
|
* or
|
|
* PWM Period = Clock Period * (N * T)
|
|
* where
|
|
* N = 2^9 or 2^6 for 9-bit or 6-bit PWM size
|
|
* T = Pre-divide * 2^m, m = 0..7 (exponent)
|
|
*/
|
|
|
|
/*
|
|
* enum pm_pwm_size - PWM bit mode selection
|
|
* %PM_PWM_SIZE_6BIT - Select 6 bit mode; 64 levels
|
|
* %PM_PWM_SIZE_9BIT - Select 9 bit mode; 512 levels
|
|
*/
|
|
enum pm_pwm_size {
|
|
PM_PWM_SIZE_6BIT = 6,
|
|
PM_PWM_SIZE_9BIT = 9,
|
|
};
|
|
|
|
/*
|
|
* enum pm_pwm_clk - PWM clock selection
|
|
* %PM_PWM_CLK_1KHZ - 1KHz clock
|
|
* %PM_PWM_CLK_32KHZ - 32KHz clock
|
|
* %PM_PWM_CLK_19P2MHZ - 19.2MHz clock
|
|
* Note: Here 1KHz = 1024Hz
|
|
*/
|
|
enum pm_pwm_clk {
|
|
PM_PWM_CLK_1KHZ,
|
|
PM_PWM_CLK_32KHZ,
|
|
PM_PWM_CLK_19P2MHZ,
|
|
};
|
|
|
|
/* PWM pre-divider selection */
|
|
enum pm_pwm_pre_div {
|
|
PM_PWM_PDIV_2,
|
|
PM_PWM_PDIV_3,
|
|
PM_PWM_PDIV_5,
|
|
PM_PWM_PDIV_6,
|
|
};
|
|
|
|
/*
|
|
* struct pwm_period_config - PWM period configuration
|
|
* @pwm_size: enum pm_pwm_size
|
|
* @clk: enum pm_pwm_clk
|
|
* @pre_div: enum pm_pwm_pre_div
|
|
* @pre_div_exp: exponent of 2 as part of pre-divider: 0..7
|
|
*/
|
|
struct pwm_period_config {
|
|
enum pm_pwm_size pwm_size;
|
|
enum pm_pwm_clk clk;
|
|
enum pm_pwm_pre_div pre_div;
|
|
int pre_div_exp;
|
|
};
|
|
|
|
/*
|
|
* struct pwm_duty_cycles - PWM duty cycle info
|
|
* duty_pcts - pointer to an array of duty percentage for a pwm period
|
|
* num_duty_pcts - total entries in duty_pcts array
|
|
* duty_ms - duty cycle time in ms
|
|
* start_idx - index in the LUT
|
|
*/
|
|
struct pwm_duty_cycles {
|
|
int *duty_pcts;
|
|
int num_duty_pcts;
|
|
int duty_ms;
|
|
int start_idx;
|
|
};
|
|
|
|
int pwm_config_period(struct pwm_device *pwm,
|
|
struct pwm_period_config *pwm_p);
|
|
|
|
int pwm_config_pwm_value(struct pwm_device *pwm, int pwm_value);
|
|
|
|
/*
|
|
* enum pm_pwm_mode - PWM mode selection
|
|
* %PM_PWM_MODE_PWM - Select PWM mode
|
|
* %PM_PWM_MODE_LPG - Select LPG mode
|
|
*/
|
|
enum pm_pwm_mode {
|
|
PM_PWM_MODE_PWM,
|
|
PM_PWM_MODE_LPG,
|
|
};
|
|
|
|
int pwm_change_mode(struct pwm_device *pwm, enum pm_pwm_mode mode);
|
|
|
|
/*
|
|
* lut_params: Lookup table (LUT) parameters
|
|
* @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
|
|
* @ramp_step_ms: time before loading next LUT pattern in millisecond
|
|
* @flags: control flags
|
|
*/
|
|
struct lut_params {
|
|
int start_idx;
|
|
int idx_len;
|
|
int lut_pause_hi;
|
|
int lut_pause_lo;
|
|
int ramp_step_ms;
|
|
int flags;
|
|
};
|
|
|
|
int pwm_lut_config(struct pwm_device *pwm, int period_us,
|
|
int duty_pct[], struct lut_params lut_params);
|
|
|
|
/* 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 /* __QPNP_PWM_H__ */
|