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139 lines
3.2 KiB
139 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson SA 2010 |
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* |
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* Author: Arun R Murthy <[email protected]> |
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*/ |
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#include <linux/err.h> |
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#include <linux/platform_device.h> |
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#include <linux/slab.h> |
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#include <linux/pwm.h> |
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#include <linux/mfd/abx500.h> |
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#include <linux/mfd/abx500/ab8500.h> |
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#include <linux/module.h> |
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/* |
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* PWM Out generators |
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* Bank: 0x10 |
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*/ |
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#define AB8500_PWM_OUT_CTRL1_REG 0x60 |
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#define AB8500_PWM_OUT_CTRL2_REG 0x61 |
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#define AB8500_PWM_OUT_CTRL7_REG 0x66 |
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struct ab8500_pwm_chip { |
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struct pwm_chip chip; |
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}; |
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static int ab8500_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 ret; |
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u8 reg; |
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unsigned int higher_val, lower_val; |
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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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ret = abx500_mask_and_set_register_interruptible(chip->dev, |
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AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, |
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1 << (chip->base - 1), 0); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to disable PWM, Error %d\n", |
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pwm->label, ret); |
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return ret; |
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} |
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/* |
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* get the first 8 bits that are be written to |
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* AB8500_PWM_OUT_CTRL1_REG[0:7] |
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*/ |
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lower_val = state->duty_cycle & 0x00FF; |
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/* |
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* get bits [9:10] that are to be written to |
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* AB8500_PWM_OUT_CTRL2_REG[0:1] |
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*/ |
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higher_val = ((state->duty_cycle & 0x0300) >> 8); |
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reg = AB8500_PWM_OUT_CTRL1_REG + ((chip->base - 1) * 2); |
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ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC, |
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reg, (u8)lower_val); |
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if (ret < 0) |
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return ret; |
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ret = abx500_set_register_interruptible(chip->dev, AB8500_MISC, |
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(reg + 1), (u8)higher_val); |
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if (ret < 0) |
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return ret; |
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ret = abx500_mask_and_set_register_interruptible(chip->dev, |
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AB8500_MISC, AB8500_PWM_OUT_CTRL7_REG, |
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1 << (chip->base - 1), 1 << (chip->base - 1)); |
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if (ret < 0) |
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dev_err(chip->dev, "%s: Failed to enable PWM, Error %d\n", |
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pwm->label, ret); |
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return ret; |
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} |
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static const struct pwm_ops ab8500_pwm_ops = { |
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.apply = ab8500_pwm_apply, |
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.owner = THIS_MODULE, |
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}; |
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static int ab8500_pwm_probe(struct platform_device *pdev) |
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{ |
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struct ab8500_pwm_chip *ab8500; |
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int err; |
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/* |
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* Nothing to be done in probe, this is required to get the |
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* device which is required for ab8500 read and write |
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*/ |
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ab8500 = devm_kzalloc(&pdev->dev, sizeof(*ab8500), GFP_KERNEL); |
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if (ab8500 == NULL) |
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return -ENOMEM; |
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ab8500->chip.dev = &pdev->dev; |
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ab8500->chip.ops = &ab8500_pwm_ops; |
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ab8500->chip.npwm = 1; |
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err = pwmchip_add(&ab8500->chip); |
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if (err < 0) |
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return dev_err_probe(&pdev->dev, err, "Failed to add pwm chip\n"); |
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dev_dbg(&pdev->dev, "pwm probe successful\n"); |
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platform_set_drvdata(pdev, ab8500); |
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return 0; |
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} |
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static int ab8500_pwm_remove(struct platform_device *pdev) |
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{ |
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struct ab8500_pwm_chip *ab8500 = platform_get_drvdata(pdev); |
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int err; |
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err = pwmchip_remove(&ab8500->chip); |
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if (err < 0) |
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return err; |
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dev_dbg(&pdev->dev, "pwm driver removed\n"); |
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return 0; |
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} |
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static struct platform_driver ab8500_pwm_driver = { |
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.driver = { |
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.name = "ab8500-pwm", |
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}, |
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.probe = ab8500_pwm_probe, |
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.remove = ab8500_pwm_remove, |
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}; |
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module_platform_driver(ab8500_pwm_driver); |
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MODULE_AUTHOR("Arun MURTHY <[email protected]>"); |
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MODULE_DESCRIPTION("AB8500 Pulse Width Modulation Driver"); |
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MODULE_ALIAS("platform:ab8500-pwm"); |
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MODULE_LICENSE("GPL v2");
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