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Release 4.14 drivers/pwm/pwm-bfin.c

Directory: drivers/pwm
/*
 * Blackfin Pulse Width Modulation (PWM) core
 *
 * Copyright (c) 2011 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>

#include <asm/gptimers.h>
#include <asm/portmux.h>


struct bfin_pwm_chip {
	
struct pwm_chip chip;
};


struct bfin_pwm {
	
unsigned short pin;
};


static const unsigned short pwm_to_gptimer_per[] = {
	P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5,
	P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11,
};


static int bfin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) { struct bfin_pwm *priv; int ret; if (pwm->hwpwm >= ARRAY_SIZE(pwm_to_gptimer_per)) return -EINVAL; priv = kzalloc(sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->pin = pwm_to_gptimer_per[pwm->hwpwm]; ret = peripheral_request(priv->pin, NULL); if (ret) { kfree(priv); return ret; } pwm_set_chip_data(pwm, priv); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger6661.68%150.00%
Thierry Reding4138.32%150.00%
Total107100.00%2100.00%


static void bfin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct bfin_pwm *priv = pwm_get_chip_data(pwm); if (priv) { peripheral_free(priv->pin); kfree(priv); } }

Contributors

PersonTokensPropCommitsCommitProp
Thierry Reding2556.82%150.00%
Mike Frysinger1943.18%150.00%
Total44100.00%2100.00%


static int bfin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct bfin_pwm *priv = pwm_get_chip_data(pwm); unsigned long period, duty; unsigned long long val; val = (unsigned long long)get_sclk() * period_ns; do_div(val, NSEC_PER_SEC); period = val; val = (unsigned long long)period * duty_ns; do_div(val, period_ns); duty = period - val; if (duty >= period) duty = period - 1; set_gptimer_config(priv->pin, TIMER_MODE_PWM | TIMER_PERIOD_CNT); set_gptimer_pwidth(priv->pin, duty); set_gptimer_period(priv->pin, period); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger11182.84%150.00%
Thierry Reding2317.16%150.00%
Total134100.00%2100.00%


static int bfin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) { struct bfin_pwm *priv = pwm_get_chip_data(pwm); enable_gptimer(priv->pin); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Thierry Reding1952.78%150.00%
Mike Frysinger1747.22%150.00%
Total36100.00%2100.00%


static void bfin_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct bfin_pwm *priv = pwm_get_chip_data(pwm); disable_gptimer(priv->pin); }

Contributors

PersonTokensPropCommitsCommitProp
Thierry Reding3090.91%150.00%
Mike Frysinger39.09%150.00%
Total33100.00%2100.00%

static const struct pwm_ops bfin_pwm_ops = { .request = bfin_pwm_request, .free = bfin_pwm_free, .config = bfin_pwm_config, .enable = bfin_pwm_enable, .disable = bfin_pwm_disable, .owner = THIS_MODULE, };
static int bfin_pwm_probe(struct platform_device *pdev) { struct bfin_pwm_chip *pwm; int ret; pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL); if (!pwm) return -ENOMEM; platform_set_drvdata(pdev, pwm); pwm->chip.dev = &pdev->dev; pwm->chip.ops = &bfin_pwm_ops; pwm->chip.base = -1; pwm->chip.npwm = 12; ret = pwmchip_add(&pwm->chip); if (ret < 0) { dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret); return ret; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Thierry Reding12296.83%150.00%
Mike Frysinger43.17%150.00%
Total126100.00%2100.00%


static int bfin_pwm_remove(struct platform_device *pdev) { struct bfin_pwm_chip *pwm = platform_get_drvdata(pdev); return pwmchip_remove(&pwm->chip); }

Contributors

PersonTokensPropCommitsCommitProp
Thierry Reding2273.33%133.33%
Mike Frysinger723.33%133.33%
Axel Lin13.33%133.33%
Total30100.00%3100.00%

static struct platform_driver bfin_pwm_driver = { .driver = { .name = "bfin-pwm", }, .probe = bfin_pwm_probe, .remove = bfin_pwm_remove, }; module_platform_driver(bfin_pwm_driver); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Thierry Reding36555.73%125.00%
Mike Frysinger28843.97%125.00%
Bhumika Goyal10.15%125.00%
Axel Lin10.15%125.00%
Total655100.00%4100.00%
Directory: drivers/pwm
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