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path: root/drivers/pwm/pwm-stmpe.c
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Diffstat (limited to 'drivers/pwm/pwm-stmpe.c')
-rw-r--r--drivers/pwm/pwm-stmpe.c137
1 files changed, 88 insertions, 49 deletions
diff --git a/drivers/pwm/pwm-stmpe.c b/drivers/pwm/pwm-stmpe.c
index 3439f1e902cb..73f12843999a 100644
--- a/drivers/pwm/pwm-stmpe.c
+++ b/drivers/pwm/pwm-stmpe.c
@@ -1,12 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2016 Linaro Ltd.
*
* Author: Linus Walleij <linus.walleij@linaro.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2, as
- * published by the Free Software Foundation.
- *
*/
#include <linux/bitops.h>
@@ -31,13 +27,12 @@
struct stmpe_pwm {
struct stmpe *stmpe;
- struct pwm_chip chip;
u8 last_duty;
};
static inline struct stmpe_pwm *to_stmpe_pwm(struct pwm_chip *chip)
{
- return container_of(chip, struct stmpe_pwm, chip);
+ return pwmchip_get_drvdata(chip);
}
static int stmpe_24xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
@@ -48,7 +43,7 @@ static int stmpe_24xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
ret = stmpe_reg_read(stmpe_pwm->stmpe, STMPE24XX_PWMCS);
if (ret < 0) {
- dev_err(chip->dev, "error reading PWM#%u control\n",
+ dev_dbg(pwmchip_parent(chip), "error reading PWM#%u control\n",
pwm->hwpwm);
return ret;
}
@@ -57,7 +52,7 @@ static int stmpe_24xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
ret = stmpe_reg_write(stmpe_pwm->stmpe, STMPE24XX_PWMCS, value);
if (ret) {
- dev_err(chip->dev, "error writing PWM#%u control\n",
+ dev_dbg(pwmchip_parent(chip), "error writing PWM#%u control\n",
pwm->hwpwm);
return ret;
}
@@ -65,8 +60,8 @@ static int stmpe_24xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
return 0;
}
-static void stmpe_24xx_pwm_disable(struct pwm_chip *chip,
- struct pwm_device *pwm)
+static int stmpe_24xx_pwm_disable(struct pwm_chip *chip,
+ struct pwm_device *pwm)
{
struct stmpe_pwm *stmpe_pwm = to_stmpe_pwm(chip);
u8 value;
@@ -74,19 +69,18 @@ static void stmpe_24xx_pwm_disable(struct pwm_chip *chip,
ret = stmpe_reg_read(stmpe_pwm->stmpe, STMPE24XX_PWMCS);
if (ret < 0) {
- dev_err(chip->dev, "error reading PWM#%u control\n",
+ dev_dbg(pwmchip_parent(chip), "error reading PWM#%u control\n",
pwm->hwpwm);
- return;
+ return ret;
}
value = ret & ~BIT(pwm->hwpwm);
ret = stmpe_reg_write(stmpe_pwm->stmpe, STMPE24XX_PWMCS, value);
- if (ret) {
- dev_err(chip->dev, "error writing PWM#%u control\n",
+ if (ret)
+ dev_dbg(pwmchip_parent(chip), "error writing PWM#%u control\n",
pwm->hwpwm);
- return;
- }
+ return ret;
}
/* STMPE 24xx PWM instructions */
@@ -115,7 +109,9 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
/* Make sure we are disabled */
if (pwm_is_enabled(pwm)) {
- stmpe_24xx_pwm_disable(chip, pwm);
+ ret = stmpe_24xx_pwm_disable(chip, pwm);
+ if (ret)
+ return ret;
} else {
/* Connect the PWM to the pin */
pin = pwm->hwpwm;
@@ -128,7 +124,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
ret = stmpe_set_altfunc(stmpe_pwm->stmpe, BIT(pin),
STMPE_BLOCK_PWM);
if (ret) {
- dev_err(chip->dev, "unable to connect PWM#%u to pin\n",
+ dev_err(pwmchip_parent(chip), "unable to connect PWM#%u to pin\n",
pwm->hwpwm);
return ret;
}
@@ -153,7 +149,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
return -ENODEV;
}
- dev_dbg(chip->dev, "PWM#%u: config duty %d ns, period %d ns\n",
+ dev_dbg(pwmchip_parent(chip), "PWM#%u: config duty %d ns, period %d ns\n",
pwm->hwpwm, duty_ns, period_ns);
if (duty_ns == 0) {
@@ -219,7 +215,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
program[1] = BRANCH;
}
- dev_dbg(chip->dev,
+ dev_dbg(pwmchip_parent(chip),
"PWM#%u: value = %02x, last_duty = %02x, program=%04x,%04x,%04x\n",
pwm->hwpwm, value, last, program[0], program[1],
program[2]);
@@ -236,7 +232,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
ret = stmpe_reg_write(stmpe_pwm->stmpe, offset, value);
if (ret) {
- dev_err(chip->dev, "error writing register %02x: %d\n",
+ dev_dbg(pwmchip_parent(chip), "error writing register %02x: %d\n",
offset, ret);
return ret;
}
@@ -245,7 +241,7 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
ret = stmpe_reg_write(stmpe_pwm->stmpe, offset, value);
if (ret) {
- dev_err(chip->dev, "error writing register %02x: %d\n",
+ dev_dbg(pwmchip_parent(chip), "error writing register %02x: %d\n",
offset, ret);
return ret;
}
@@ -258,62 +254,105 @@ static int stmpe_24xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
/* Sleep for 200ms so we're sure it will take effect */
msleep(200);
- dev_dbg(chip->dev, "programmed PWM#%u, %u bytes\n", pwm->hwpwm, i);
+ dev_dbg(pwmchip_parent(chip), "programmed PWM#%u, %u bytes\n", pwm->hwpwm, i);
return 0;
}
+static int stmpe_24xx_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+ const struct pwm_state *state)
+{
+ int err;
+
+ if (state->polarity != PWM_POLARITY_NORMAL)
+ return -EINVAL;
+
+ if (!state->enabled) {
+ if (pwm->state.enabled)
+ return stmpe_24xx_pwm_disable(chip, pwm);
+
+ return 0;
+ }
+
+ err = stmpe_24xx_pwm_config(chip, pwm, state->duty_cycle, state->period);
+ if (err)
+ return err;
+
+ if (!pwm->state.enabled)
+ err = stmpe_24xx_pwm_enable(chip, pwm);
+
+ return err;
+}
+
static const struct pwm_ops stmpe_24xx_pwm_ops = {
- .config = stmpe_24xx_pwm_config,
- .enable = stmpe_24xx_pwm_enable,
- .disable = stmpe_24xx_pwm_disable,
- .owner = THIS_MODULE,
+ .apply = stmpe_24xx_pwm_apply,
};
static int __init stmpe_pwm_probe(struct platform_device *pdev)
{
struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
- struct stmpe_pwm *pwm;
+ struct pwm_chip *chip;
+ struct stmpe_pwm *stmpe_pwm;
int ret;
- pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
- if (!pwm)
- return -ENOMEM;
+ switch (stmpe->partnum) {
+ case STMPE2401:
+ case STMPE2403:
+ break;
+ case STMPE1601:
+ return dev_err_probe(&pdev->dev, -ENODEV,
+ "STMPE1601 not yet supported\n");
+ default:
+ return dev_err_probe(&pdev->dev, -ENODEV,
+ "Unknown STMPE PWM\n");
+ }
- pwm->stmpe = stmpe;
- pwm->chip.dev = &pdev->dev;
- pwm->chip.base = -1;
+ chip = devm_pwmchip_alloc(&pdev->dev, 3, sizeof(*stmpe_pwm));
+ if (IS_ERR(chip))
+ return PTR_ERR(chip);
+ stmpe_pwm = to_stmpe_pwm(chip);
- if (stmpe->partnum == STMPE2401 || stmpe->partnum == STMPE2403) {
- pwm->chip.ops = &stmpe_24xx_pwm_ops;
- pwm->chip.npwm = 3;
- } else {
- if (stmpe->partnum == STMPE1601)
- dev_err(&pdev->dev, "STMPE1601 not yet supported\n");
- else
- dev_err(&pdev->dev, "Unknown STMPE PWM\n");
+ stmpe_pwm->stmpe = stmpe;
- return -ENODEV;
- }
+ chip->ops = &stmpe_24xx_pwm_ops;
ret = stmpe_enable(stmpe, STMPE_BLOCK_PWM);
if (ret)
return ret;
- ret = pwmchip_add(&pwm->chip);
+ ret = pwmchip_add(chip);
if (ret) {
stmpe_disable(stmpe, STMPE_BLOCK_PWM);
return ret;
}
- platform_set_drvdata(pdev, pwm);
+ platform_set_drvdata(pdev, chip);
return 0;
}
-static struct platform_driver stmpe_pwm_driver = {
+static void __exit stmpe_pwm_remove(struct platform_device *pdev)
+{
+ struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
+ struct pwm_chip *chip = platform_get_drvdata(pdev);
+
+ pwmchip_remove(chip);
+ stmpe_disable(stmpe, STMPE_BLOCK_PWM);
+}
+
+/*
+ * stmpe_pwm_remove() lives in .exit.text. For drivers registered via
+ * module_platform_driver_probe() this is ok because they cannot get unbound at
+ * runtime. So mark the driver struct with __refdata to prevent modpost
+ * triggering a section mismatch warning.
+ */
+static struct platform_driver stmpe_pwm_driver __refdata = {
.driver = {
.name = "stmpe-pwm",
},
+ .remove = __exit_p(stmpe_pwm_remove),
};
-builtin_platform_driver_probe(stmpe_pwm_driver, stmpe_pwm_probe);
+module_platform_driver_probe(stmpe_pwm_driver, stmpe_pwm_probe);
+
+MODULE_DESCRIPTION("STMPE expander PWM");
+MODULE_LICENSE("GPL");
generated by cgit (git 2.34.1) at 2025-12-22 09:08:07 +0000