2019-05-31 01:09:32 -07:00
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// SPDX-License-Identifier: GPL-2.0-only
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2013-12-05 19:18:43 -07:00
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/*
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* TI/National Semiconductor LP3943 PWM driver
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*
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* Copyright 2013 Texas Instruments
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*
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* Author: Milo Kim <milo.kim@ti.com>
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*/
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#include <linux/err.h>
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#include <linux/mfd/lp3943.h>
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#include <linux/module.h>
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2023-07-14 10:48:50 -07:00
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#include <linux/of.h>
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2013-12-05 19:18:43 -07:00
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#include <linux/platform_device.h>
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#include <linux/pwm.h>
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#include <linux/slab.h>
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#define LP3943_MAX_DUTY 255
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#define LP3943_MIN_PERIOD 6250
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#define LP3943_MAX_PERIOD 1600000
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struct lp3943_pwm {
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struct lp3943 *lp3943;
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struct lp3943_platform_data *pdata;
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struct lp3943_pwm_map pwm_map[LP3943_NUM_PWMS];
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2013-12-05 19:18:43 -07:00
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};
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2023-07-14 13:56:19 -07:00
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static inline struct lp3943_pwm *to_lp3943_pwm(struct pwm_chip *chip)
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{
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2024-02-14 02:31:46 -07:00
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return pwmchip_get_drvdata(chip);
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2013-12-05 19:18:43 -07:00
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}
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static struct lp3943_pwm_map *
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lp3943_pwm_request_map(struct lp3943_pwm *lp3943_pwm, int hwpwm)
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{
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struct lp3943_platform_data *pdata = lp3943_pwm->pdata;
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struct lp3943 *lp3943 = lp3943_pwm->lp3943;
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2023-07-05 01:06:46 -07:00
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struct lp3943_pwm_map *pwm_map = &lp3943_pwm->pwm_map[hwpwm];
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int i, offset;
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pwm_map->output = pdata->pwms[hwpwm]->output;
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pwm_map->num_outputs = pdata->pwms[hwpwm]->num_outputs;
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for (i = 0; i < pwm_map->num_outputs; i++) {
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offset = pwm_map->output[i];
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/* Return an error if the pin is already assigned */
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if (test_and_set_bit(offset, &lp3943->pin_used))
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2013-12-05 19:18:43 -07:00
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return ERR_PTR(-EBUSY);
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}
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return pwm_map;
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}
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static int lp3943_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct lp3943_pwm *lp3943_pwm = to_lp3943_pwm(chip);
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struct lp3943_pwm_map *pwm_map;
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pwm_map = lp3943_pwm_request_map(lp3943_pwm, pwm->hwpwm);
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if (IS_ERR(pwm_map))
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return PTR_ERR(pwm_map);
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2023-07-05 01:06:46 -07:00
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return 0;
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}
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static void lp3943_pwm_free_map(struct lp3943_pwm *lp3943_pwm,
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struct lp3943_pwm_map *pwm_map)
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{
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struct lp3943 *lp3943 = lp3943_pwm->lp3943;
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int i, offset;
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for (i = 0; i < pwm_map->num_outputs; i++) {
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offset = pwm_map->output[i];
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clear_bit(offset, &lp3943->pin_used);
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}
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}
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static void lp3943_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct lp3943_pwm *lp3943_pwm = to_lp3943_pwm(chip);
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struct lp3943_pwm_map *pwm_map = &lp3943_pwm->pwm_map[pwm->hwpwm];
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2013-12-05 19:18:43 -07:00
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lp3943_pwm_free_map(lp3943_pwm, pwm_map);
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}
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static int lp3943_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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u64 duty_ns, u64 period_ns)
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{
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struct lp3943_pwm *lp3943_pwm = to_lp3943_pwm(chip);
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struct lp3943 *lp3943 = lp3943_pwm->lp3943;
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u8 val, reg_duty, reg_prescale;
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int err;
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/*
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* How to configure the LP3943 PWMs
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*
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* 1) Period = 6250 ~ 1600000
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* 2) Prescale = period / 6250 -1
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* 3) Duty = input duty
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*
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* Prescale and duty are register values
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*/
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if (pwm->hwpwm == 0) {
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reg_prescale = LP3943_REG_PRESCALE0;
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reg_duty = LP3943_REG_PWM0;
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} else {
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reg_prescale = LP3943_REG_PRESCALE1;
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reg_duty = LP3943_REG_PWM1;
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}
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2022-04-08 08:22:39 -07:00
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/*
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* Note that after this clamping, period_ns fits into an int. This is
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* helpful because we can resort to integer division below instead of
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* the (more expensive) 64 bit division.
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*/
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period_ns = clamp(period_ns, (u64)LP3943_MIN_PERIOD, (u64)LP3943_MAX_PERIOD);
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val = (u8)((int)period_ns / LP3943_MIN_PERIOD - 1);
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2013-12-05 19:18:43 -07:00
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err = lp3943_write_byte(lp3943, reg_prescale, val);
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if (err)
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return err;
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2022-04-08 08:22:38 -07:00
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duty_ns = min(duty_ns, period_ns);
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val = (u8)((int)duty_ns * LP3943_MAX_DUTY / (int)period_ns);
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return lp3943_write_byte(lp3943, reg_duty, val);
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}
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static int lp3943_pwm_set_mode(struct lp3943_pwm *lp3943_pwm,
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struct lp3943_pwm_map *pwm_map,
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u8 val)
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{
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struct lp3943 *lp3943 = lp3943_pwm->lp3943;
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const struct lp3943_reg_cfg *mux = lp3943->mux_cfg;
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int i, index, err;
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for (i = 0; i < pwm_map->num_outputs; i++) {
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index = pwm_map->output[i];
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err = lp3943_update_bits(lp3943, mux[index].reg,
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mux[index].mask,
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val << mux[index].shift);
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if (err)
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return err;
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}
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return 0;
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}
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static int lp3943_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct lp3943_pwm *lp3943_pwm = to_lp3943_pwm(chip);
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2023-07-05 01:06:46 -07:00
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struct lp3943_pwm_map *pwm_map = &lp3943_pwm->pwm_map[pwm->hwpwm];
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u8 val;
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if (pwm->hwpwm == 0)
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val = LP3943_DIM_PWM0;
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else
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val = LP3943_DIM_PWM1;
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/*
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* Each PWM generator is set to control any of outputs of LP3943.
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* To enable/disable the PWM, these output pins should be configured.
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*/
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return lp3943_pwm_set_mode(lp3943_pwm, pwm_map, val);
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}
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static void lp3943_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct lp3943_pwm *lp3943_pwm = to_lp3943_pwm(chip);
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struct lp3943_pwm_map *pwm_map = &lp3943_pwm->pwm_map[pwm->hwpwm];
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2013-12-05 19:18:43 -07:00
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/*
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* LP3943 outputs are open-drain, so the pin should be configured
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* when the PWM is disabled.
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*/
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lp3943_pwm_set_mode(lp3943_pwm, pwm_map, LP3943_GPIO_OUT_HIGH);
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}
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2022-04-08 08:22:39 -07:00
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static int lp3943_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
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const struct pwm_state *state)
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{
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int err;
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if (state->polarity != PWM_POLARITY_NORMAL)
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return -EINVAL;
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if (!state->enabled) {
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if (pwm->state.enabled)
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lp3943_pwm_disable(chip, pwm);
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return 0;
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}
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err = lp3943_pwm_config(chip, pwm, state->duty_cycle, state->period);
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if (err)
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return err;
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if (!pwm->state.enabled)
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err = lp3943_pwm_enable(chip, pwm);
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return err;
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}
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2013-12-05 19:18:43 -07:00
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static const struct pwm_ops lp3943_pwm_ops = {
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.request = lp3943_pwm_request,
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.free = lp3943_pwm_free,
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.apply = lp3943_pwm_apply,
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2013-12-05 19:18:43 -07:00
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};
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static int lp3943_pwm_parse_dt(struct device *dev,
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struct lp3943_pwm *lp3943_pwm)
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{
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static const char * const name[] = { "ti,pwm0", "ti,pwm1", };
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struct device_node *node = dev->of_node;
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struct lp3943_platform_data *pdata;
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struct lp3943_pwm_map *pwm_map;
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enum lp3943_pwm_output *output;
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2024-08-09 01:05:23 -07:00
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int i, err, num_outputs, count = 0;
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2013-12-05 19:18:43 -07:00
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if (!node)
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return -EINVAL;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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/*
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* Read the output map configuration from the device tree.
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* Each of the two PWM generators can drive zero or more outputs.
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*/
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for (i = 0; i < LP3943_NUM_PWMS; i++) {
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2024-07-31 13:14:03 -07:00
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num_outputs = of_property_count_u32_elems(node, name[i]);
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if (num_outputs <= 0)
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2013-12-05 19:18:43 -07:00
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continue;
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treewide: devm_kzalloc() -> devm_kcalloc()
The devm_kzalloc() function has a 2-factor argument form, devm_kcalloc().
This patch replaces cases of:
devm_kzalloc(handle, a * b, gfp)
with:
devm_kcalloc(handle, a * b, gfp)
as well as handling cases of:
devm_kzalloc(handle, a * b * c, gfp)
with:
devm_kzalloc(handle, array3_size(a, b, c), gfp)
as it's slightly less ugly than:
devm_kcalloc(handle, array_size(a, b), c, gfp)
This does, however, attempt to ignore constant size factors like:
devm_kzalloc(handle, 4 * 1024, gfp)
though any constants defined via macros get caught up in the conversion.
Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.
Some manual whitespace fixes were needed in this patch, as Coccinelle
really liked to write "=devm_kcalloc..." instead of "= devm_kcalloc...".
The Coccinelle script used for this was:
// Fix redundant parens around sizeof().
@@
expression HANDLE;
type TYPE;
expression THING, E;
@@
(
devm_kzalloc(HANDLE,
- (sizeof(TYPE)) * E
+ sizeof(TYPE) * E
, ...)
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devm_kzalloc(HANDLE,
- (sizeof(THING)) * E
+ sizeof(THING) * E
, ...)
)
// Drop single-byte sizes and redundant parens.
@@
expression HANDLE;
expression COUNT;
typedef u8;
typedef __u8;
@@
(
devm_kzalloc(HANDLE,
- sizeof(u8) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(__u8) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(char) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(unsigned char) * (COUNT)
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(u8) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(__u8) * COUNT
+ COUNT
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(char) * COUNT
+ COUNT
, ...)
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devm_kzalloc(HANDLE,
- sizeof(unsigned char) * COUNT
+ COUNT
, ...)
)
// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
expression HANDLE;
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@
(
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (COUNT_ID)
+ COUNT_ID, sizeof(TYPE)
, ...)
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- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * COUNT_ID
+ COUNT_ID, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (COUNT_CONST)
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * COUNT_CONST
+ COUNT_CONST, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (COUNT_ID)
+ COUNT_ID, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * COUNT_ID
+ COUNT_ID, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (COUNT_CONST)
+ COUNT_CONST, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * COUNT_CONST
+ COUNT_CONST, sizeof(THING)
, ...)
)
// 2-factor product, only identifiers.
@@
expression HANDLE;
identifier SIZE, COUNT;
@@
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- SIZE * COUNT
+ COUNT, SIZE
, ...)
// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression HANDLE;
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@
(
devm_kzalloc(HANDLE,
- sizeof(TYPE) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(TYPE))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * (COUNT) * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * (COUNT) * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * COUNT * (STRIDE)
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING) * COUNT * STRIDE
+ array3_size(COUNT, STRIDE, sizeof(THING))
, ...)
)
// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression HANDLE;
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@
(
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(THING1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(THING1), sizeof(THING2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * COUNT
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
|
devm_kzalloc(HANDLE,
- sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+ array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
, ...)
)
// 3-factor product, only identifiers, with redundant parens removed.
@@
expression HANDLE;
identifier STRIDE, SIZE, COUNT;
@@
(
devm_kzalloc(HANDLE,
- (COUNT) * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * (STRIDE) * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * STRIDE * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- (COUNT) * (STRIDE) * (SIZE)
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
|
devm_kzalloc(HANDLE,
- COUNT * STRIDE * SIZE
+ array3_size(COUNT, STRIDE, SIZE)
, ...)
)
// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression HANDLE;
expression E1, E2, E3;
constant C1, C2, C3;
@@
(
devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
devm_kzalloc(HANDLE,
- (E1) * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- (E1) * (E2) * E3
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- (E1) * (E2) * (E3)
+ array3_size(E1, E2, E3)
, ...)
|
devm_kzalloc(HANDLE,
- E1 * E2 * E3
+ array3_size(E1, E2, E3)
, ...)
)
// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression HANDLE;
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@
(
devm_kzalloc(HANDLE, sizeof(THING) * C2, ...)
|
devm_kzalloc(HANDLE, sizeof(TYPE) * C2, ...)
|
devm_kzalloc(HANDLE, C1 * C2 * C3, ...)
|
devm_kzalloc(HANDLE, C1 * C2, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * (E2)
+ E2, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(TYPE) * E2
+ E2, sizeof(TYPE)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * (E2)
+ E2, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- sizeof(THING) * E2
+ E2, sizeof(THING)
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- (E1) * E2
+ E1, E2
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- (E1) * (E2)
+ E1, E2
, ...)
|
- devm_kzalloc
+ devm_kcalloc
(HANDLE,
- E1 * E2
+ E1, E2
, ...)
)
Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 14:07:58 -07:00
|
|
|
output = devm_kcalloc(dev, num_outputs, sizeof(*output),
|
2013-12-05 19:18:43 -07:00
|
|
|
GFP_KERNEL);
|
|
|
|
if (!output)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
err = of_property_read_u32_array(node, name[i], output,
|
|
|
|
num_outputs);
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
pwm_map = devm_kzalloc(dev, sizeof(*pwm_map), GFP_KERNEL);
|
|
|
|
if (!pwm_map)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
pwm_map->output = output;
|
|
|
|
pwm_map->num_outputs = num_outputs;
|
|
|
|
pdata->pwms[i] = pwm_map;
|
|
|
|
|
|
|
|
count++;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (count == 0)
|
|
|
|
return -ENODATA;
|
|
|
|
|
|
|
|
lp3943_pwm->pdata = pdata;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int lp3943_pwm_probe(struct platform_device *pdev)
|
|
|
|
{
|
|
|
|
struct lp3943 *lp3943 = dev_get_drvdata(pdev->dev.parent);
|
2024-02-14 02:31:46 -07:00
|
|
|
struct pwm_chip *chip;
|
2013-12-05 19:18:43 -07:00
|
|
|
struct lp3943_pwm *lp3943_pwm;
|
|
|
|
int ret;
|
|
|
|
|
2024-02-14 02:31:46 -07:00
|
|
|
chip = devm_pwmchip_alloc(&pdev->dev, LP3943_NUM_PWMS, sizeof(*lp3943_pwm));
|
|
|
|
if (IS_ERR(chip))
|
|
|
|
return PTR_ERR(chip);
|
|
|
|
lp3943_pwm = to_lp3943_pwm(chip);
|
2013-12-05 19:18:43 -07:00
|
|
|
|
|
|
|
lp3943_pwm->pdata = lp3943->pdata;
|
|
|
|
if (!lp3943_pwm->pdata) {
|
|
|
|
if (IS_ENABLED(CONFIG_OF))
|
|
|
|
ret = lp3943_pwm_parse_dt(&pdev->dev, lp3943_pwm);
|
|
|
|
else
|
|
|
|
ret = -ENODEV;
|
|
|
|
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
lp3943_pwm->lp3943 = lp3943;
|
2024-02-14 02:31:46 -07:00
|
|
|
chip->ops = &lp3943_pwm_ops;
|
2013-12-05 19:18:43 -07:00
|
|
|
|
2024-02-14 02:31:46 -07:00
|
|
|
return devm_pwmchip_add(&pdev->dev, chip);
|
2013-12-05 19:18:43 -07:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_OF
|
|
|
|
static const struct of_device_id lp3943_pwm_of_match[] = {
|
|
|
|
{ .compatible = "ti,lp3943-pwm", },
|
|
|
|
{ }
|
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, lp3943_pwm_of_match);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static struct platform_driver lp3943_pwm_driver = {
|
|
|
|
.probe = lp3943_pwm_probe,
|
|
|
|
.driver = {
|
|
|
|
.name = "lp3943-pwm",
|
|
|
|
.of_match_table = of_match_ptr(lp3943_pwm_of_match),
|
|
|
|
},
|
|
|
|
};
|
|
|
|
module_platform_driver(lp3943_pwm_driver);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("LP3943 PWM driver");
|
|
|
|
MODULE_ALIAS("platform:lp3943-pwm");
|
|
|
|
MODULE_AUTHOR("Milo Kim");
|
|
|
|
MODULE_LICENSE("GPL");
|