misc: add PWM (Pulse Width Modulation) driver for pmic8058 chip
Qualcomm PM8058 chip has 8 channels of PWM, also called LPG (Light Pulse Generator). All PWM channels can be used as simple PWM machine or as a more advanced PWM pattern generator using programmed lookup table. This patch supports simple PWM machine as a sub device of pmic8058 core. To use PWM: 1. #include <linux/pwm.h> 2. #include <linux/pmic8058-pwm.h> only when you want to do the configuration by yourself. 3. First call * pwm_request() -- to reserve a PWM chanel 4. Call these APIs to configure & start/stop a PWM waveform * pwm_config(period, duty) -- to configure a PWM wave * pwm_enable() -- to start and enable the PWM output * pwm_disable() -- to stop and disable the PWM output You can repeat above 3 calls for different PWM waveforms. 5. Last call * pwm_free() -- to free the PWM channel Signed-off-by: Willie Ruan <wruan@quicinc.com>
This commit is contained in:
Willie Ruan
committed by
Stephen Boyd
Stephen Boyd
parent
247c163fb7
commit
9cda9da6e2
@@ -566,6 +566,16 @@ config HAPTIC_ISA1200
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help
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The ISA1200 is a high performance enhanced haptic driver.
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config PMIC8058_PWM
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tristate "Qualcomm PM8058 PWM support"
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depends on PMIC8058
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default y
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help
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This option enables device driver support for the PWM channels
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on Qualcomm PM8058 chip. Pulse Width Modulation is used for
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purposes including software controlled brightness of backlight,
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motor control, and waveform generation.
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source "drivers/misc/c2port/Kconfig"
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source "drivers/misc/eeprom/Kconfig"
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source "drivers/misc/cb710/Kconfig"
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@@ -57,3 +57,4 @@ msm_tsif-objs := tsif.o
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obj-$(CONFIG_TSIF_CHRDEV) += tsif_chrdev.o
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obj-$(CONFIG_TSPP) += tspp.o
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obj-$(CONFIG_HAPTIC_ISA1200) += isa1200.o
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obj-$(CONFIG_PMIC8058_PWM) += pmic8058-pwm.o
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1085
drivers/misc/pmic8058-pwm.c
Normal file
1085
drivers/misc/pmic8058-pwm.c
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File diff suppressed because it is too large
Load Diff
148
include/linux/pmic8058-pwm.h
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148
include/linux/pmic8058-pwm.h
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@@ -0,0 +1,148 @@
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/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
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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 and
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* only version 2 as published by the Free Software Foundation.
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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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*/
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#ifndef __PMIC8058_PWM_H__
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#define __PMIC8058_PWM_H__
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/* The MAX value is computation limit. Hardware limit is 393 seconds. */
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#define PM_PWM_PERIOD_MAX (274 * USEC_PER_SEC)
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/* The MIN value is hardware limit. */
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#define PM_PWM_PERIOD_MIN 7 /* micro seconds */
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struct pm8058_pwm_pdata {
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int (*config)(struct pwm_device *pwm, int ch, int on);
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int (*enable)(struct pwm_device *pwm, int ch, int on);
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};
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#define PM_PWM_LUT_SIZE 64
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#define PM_PWM_LUT_DUTY_TIME_MAX 512 /* ms */
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#define PM_PWM_LUT_PAUSE_MAX (7000 * PM_PWM_LUT_DUTY_TIME_MAX)
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/* Flags for Look Up Table */
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#define PM_PWM_LUT_LOOP 0x01
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#define PM_PWM_LUT_RAMP_UP 0x02
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#define PM_PWM_LUT_REVERSE 0x04
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#define PM_PWM_LUT_PAUSE_HI_EN 0x10
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#define PM_PWM_LUT_PAUSE_LO_EN 0x20
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#define PM_PWM_LUT_NO_TABLE 0x100
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/* PWM LED ID */
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#define PM_PWM_LED_0 0
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#define PM_PWM_LED_1 1
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#define PM_PWM_LED_2 2
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#define PM_PWM_LED_KPD 3
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#define PM_PWM_LED_FLASH 4
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#define PM_PWM_LED_FLASH1 5
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/* PWM LED configuration mode */
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#define PM_PWM_CONF_NONE 0x0
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#define PM_PWM_CONF_PWM1 0x1
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#define PM_PWM_CONF_PWM2 0x2
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#define PM_PWM_CONF_PWM3 0x3
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#define PM_PWM_CONF_DTEST1 0x4
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#define PM_PWM_CONF_DTEST2 0x5
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#define PM_PWM_CONF_DTEST3 0x6
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#define PM_PWM_CONF_DTEST4 0x7
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/**
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* PWM frequency/period control
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*
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* PWM Frequency = ClockFrequency / (N * T)
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* or
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* PWM Period = Clock Period * (N * T)
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* where
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* N = 2^9 or 2^6 for 9-bit or 6-bit PWM size
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* T = Pre-divide * 2^m, m = 0..7 (exponent)
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*
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*/
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enum pm_pwm_size {
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PM_PWM_SIZE_6BIT = 6,
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PM_PWM_SIZE_9BIT = 9,
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};
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enum pm_pwm_clk {
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PM_PWM_CLK_1KHZ,
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PM_PWM_CLK_32KHZ,
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PM_PWM_CLK_19P2MHZ,
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};
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enum pm_pwm_pre_div {
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PM_PWM_PDIV_2,
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PM_PWM_PDIV_3,
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PM_PWM_PDIV_5,
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PM_PWM_PDIV_6,
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};
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/**
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* struct pm8058_pwm_period - PWM period structure
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* @pwm_size: enum pm_pwm_size
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* @clk: enum pm_pwm_clk
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* @pre_div: enum pm_pwm_pre_div
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* @pre_div_exp: exponent of 2 as part of pre-divider: 0..7
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*/
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struct pm8058_pwm_period {
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enum pm_pwm_size pwm_size;
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enum pm_pwm_clk clk;
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enum pm_pwm_pre_div pre_div;
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int pre_div_exp;
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};
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/**
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* pm8058_pwm_config_period - change PWM period
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*
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* @pwm: the PWM device
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* @pwm_p: period in struct pm8058_pwm_period
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*/
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int pm8058_pwm_config_period(struct pwm_device *pwm,
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struct pm8058_pwm_period *pwm_p);
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/**
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* pm8058_pwm_config_duty_cycle - change PWM duty cycle
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*
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* @pwm: the PWM device
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* @pwm_value: the duty cycle in raw PWM value (< 2^pwm_size)
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*/
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int pm8058_pwm_config_duty_cycle(struct pwm_device *pwm, int pwm_value);
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/**
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* pm8058_pwm_lut_config - change a PWM device configuration to use LUT
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*
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* @pwm: the PWM device
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* @period_us: period in micro second
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* @duty_pct: arrary of duty cycles in percent, like 20, 50.
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* @duty_time_ms: time for each duty cycle in millisecond
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* @start_idx: start index in lookup table from 0 to MAX-1
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* @idx_len: number of index
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* @pause_lo: pause time in millisecond at low index
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* @pause_hi: pause time in millisecond at high index
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* @flags: control flags
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*/
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int pm8058_pwm_lut_config(struct pwm_device *pwm, int period_us,
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int duty_pct[], int duty_time_ms, int start_idx,
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int len, int pause_lo, int pause_hi, int flags);
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/**
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* pm8058_pwm_lut_enable - control a PWM device to start/stop LUT ramp
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*
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* @pwm: the PWM device
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* @start: to start (1), or stop (0)
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*/
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int pm8058_pwm_lut_enable(struct pwm_device *pwm, int start);
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int pm8058_pwm_set_dtest(struct pwm_device *pwm, int enable);
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int pm8058_pwm_config_led(struct pwm_device *pwm, int id,
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int mode, int max_current);
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#endif /* __PMIC8058_PWM_H__ */
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