| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Uwe Kleine-König | 415 | 47.48% | 6 | 31.58% |
| Arun Murthy | 299 | 34.21% | 1 | 5.26% |
| Thierry Reding | 80 | 9.15% | 1 | 5.26% |
| Rabin Vincent | 31 | 3.55% | 1 | 5.26% |
| Jingoo Han | 16 | 1.83% | 1 | 5.26% |
| Srinidhi Kasagar | 15 | 1.72% | 1 | 5.26% |
| Axel Lin | 11 | 1.26% | 4 | 21.05% |
| Paul Gortmaker | 3 | 0.34% | 1 | 5.26% |
| Linus Walleij | 2 | 0.23% | 1 | 5.26% |
| Thomas Gleixner | 1 | 0.11% | 1 | 5.26% |
| Tejun Heo | 1 | 0.11% | 1 | 5.26% |
| Total | 874 | 19 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) ST-Ericsson SA 2010 * * Author: Arun R Murthy <arun.murthy@stericsson.com> * Datasheet: https://web.archive.org/web/20130614115108/http://www.stericsson.com/developers/CD00291561_UM1031_AB8500_user_manual-rev5_CTDS_public.pdf */ #include <linux/err.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/pwm.h> #include <linux/mfd/abx500.h> #include <linux/mfd/abx500/ab8500.h> #include <linux/module.h> /* * PWM Out generators * Bank: 0x10 */ #define AB8500_PWM_OUT_CTRL1_REG 0x60 #define AB8500_PWM_OUT_CTRL2_REG 0x61 #define AB8500_PWM_OUT_CTRL7_REG 0x66 #define AB8500_PWM_CLKRATE 9600000 struct ab8500_pwm_chip { struct pwm_chip chip; unsigned int hwid; }; static struct ab8500_pwm_chip *ab8500_pwm_from_chip(struct pwm_chip *chip) { return container_of(chip, struct ab8500_pwm_chip, chip); } static int ab8500_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { int ret; u8 reg; u8 higher_val, lower_val; unsigned int duty_steps, div; struct ab8500_pwm_chip *ab8500 = ab8500_pwm_from_chip(chip); if (state->polarity != PWM_POLARITY_NORMAL) return -EINVAL; if (state->enabled) { /* * A time quantum is * q = (32 - FreqPWMOutx[3:0]) / AB8500_PWM_CLKRATE * The period is always 1024 q, duty_cycle is between 1q and 1024q. * * FreqPWMOutx[3:0] | output frequency | output frequency | 1024q = period * | (from manual) | (1 / 1024q) | = 1 / freq * -----------------+------------------+------------------+-------------- * b0000 | 293 Hz | 292.968750 Hz | 3413333.33 ns * b0001 | 302 Hz | 302.419355 Hz | 3306666.66 ns * b0010 | 312 Hz | 312.500000 Hz | 3200000 ns * b0011 | 323 Hz | 323.275862 Hz | 3093333.33 ns * b0100 | 334 Hz | 334.821429 Hz | 2986666.66 ns * b0101 | 347 Hz | 347.222222 Hz | 2880000 ns * b0110 | 360 Hz | 360.576923 Hz | 2773333.33 ns * b0111 | 375 Hz | 375.000000 Hz | 2666666.66 ns * b1000 | 390 Hz | 390.625000 Hz | 2560000 ns * b1001 | 407 Hz | 407.608696 Hz | 2453333.33 ns * b1010 | 426 Hz | 426.136364 Hz | 2346666.66 ns * b1011 | 446 Hz | 446.428571 Hz | 2240000 ns * b1100 | 468 Hz | 468.750000 Hz | 2133333.33 ns * b1101 | 493 Hz | 493.421053 Hz | 2026666.66 ns * b1110 | 520 Hz | 520.833333 Hz | 1920000 ns * b1111 | 551 Hz | 551.470588 Hz | 1813333.33 ns * * * AB8500_PWM_CLKRATE is a multiple of 1024, so the division by * 1024 can be done in this factor without loss of precision. */ div = min_t(u64, mul_u64_u64_div_u64(state->period, AB8500_PWM_CLKRATE >> 10, NSEC_PER_SEC), 32); /* 32 - FreqPWMOutx[3:0] */ if (div <= 16) /* requested period < 3413333.33 */ return -EINVAL; duty_steps = max_t(u64, mul_u64_u64_div_u64(state->duty_cycle, AB8500_PWM_CLKRATE, (u64)NSEC_PER_SEC * div), 1024); } /* * The hardware doesn't support duty_steps = 0 explicitly, but emits low * when disabled. */ if (!state->enabled || duty_steps == 0) { ret = abx500_mask_and_set_register_interruptible(chip->dev, AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, 1 << ab8500->hwid, 0); if (ret < 0) dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n", pwm->label, ret); return ret; } /* * The lower 8 bits of duty_steps is written to ... * AB8500_PWM_OUT_CTRL1_REG[0:7] */ lower_val = (duty_steps - 1) & 0x00ff; /* * The two remaining high bits to * AB8500_PWM_OUT_CTRL2_REG[0:1]; together with FreqPWMOutx. */ higher_val = ((duty_steps - 1) & 0x0300) >> 8 | (32 - div) << 4; reg = AB8500_PWM_OUT_CTRL1_REG + (ab8500->hwid * 2); ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC, reg, lower_val); if (ret < 0) return ret; ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC, (reg + 1), higher_val); if (ret < 0) return ret; /* enable */ ret = abx500_mask_and_set_register_interruptible(chip->dev, AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, 1 << ab8500->hwid, 1 << ab8500->hwid); if (ret < 0) dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n", pwm->label, ret); return ret; } static int ab8500_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, struct pwm_state *state) { u8 ctrl7, lower_val, higher_val; int ret; struct ab8500_pwm_chip *ab8500 = ab8500_pwm_from_chip(chip); unsigned int div, duty_steps; ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, &ctrl7); if (ret) return ret; state->polarity = PWM_POLARITY_NORMAL; if (!(ctrl7 & 1 << ab8500->hwid)) { state->enabled = false; return 0; } ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC, AB8500_PWM_OUT_CTRL1_REG + (ab8500->hwid * 2), &lower_val); if (ret) return ret; ret = abx500_get_register_interruptible(chip->dev, AB8500_MISC, AB8500_PWM_OUT_CTRL2_REG + (ab8500->hwid * 2), &higher_val); if (ret) return ret; div = 32 - ((higher_val & 0xf0) >> 4); duty_steps = ((higher_val & 3) << 8 | lower_val) + 1; state->period = DIV64_U64_ROUND_UP((u64)div << 10, AB8500_PWM_CLKRATE); state->duty_cycle = DIV64_U64_ROUND_UP((u64)div * duty_steps, AB8500_PWM_CLKRATE); return 0; } static const struct pwm_ops ab8500_pwm_ops = { .apply = ab8500_pwm_apply, .get_state = ab8500_pwm_get_state, .owner = THIS_MODULE, }; static int ab8500_pwm_probe(struct platform_device *pdev) { struct ab8500_pwm_chip *ab8500; int err; if (pdev->id < 1 || pdev->id > 31) return dev_err_probe(&pdev->dev, EINVAL, "Invalid device id %d\n", pdev->id); /* * Nothing to be done in probe, this is required to get the * device which is required for ab8500 read and write */ ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL); if (ab8500 == NULL) return -ENOMEM; ab8500->chip.dev = &pdev->dev; ab8500->chip.ops = &ab8500_pwm_ops; ab8500->chip.npwm = 1; ab8500->hwid = pdev->id - 1; err = devm_pwmchip_add(&pdev->dev, &ab8500->chip); if (err < 0) return dev_err_probe(&pdev->dev, err, "Failed to add pwm chip\n"); dev_dbg(&pdev->dev, "pwm probe successful\n"); return 0; } static struct platform_driver ab8500_pwm_driver = { .driver = { .name = "ab8500-pwm", }, .probe = ab8500_pwm_probe, }; module_platform_driver(ab8500_pwm_driver); MODULE_AUTHOR("Arun MURTHY <arun.murthy@stericsson.com>"); MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver"); MODULE_ALIAS("platform:ab8500-pwm"); MODULE_LICENSE("GPL v2");