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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20e7f0f6e89sm68503615ad.277.2024.10.24.02.00.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Oct 2024 02:00:21 -0700 (PDT) From: Ming Yu X-Google-Original-From: Ming Yu To: tmyu0@nuvoton.com, lee@kernel.org, linus.walleij@linaro.org, brgl@bgdev.pl, andi.shyti@kernel.org, mkl@pengutronix.de, mailhol.vincent@wanadoo.fr, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, wim@linux-watchdog.org, linux@roeck-us.net, jdelvare@suse.com, jic23@kernel.org, lars@metafoo.de, ukleinek@kernel.org, alexandre.belloni@bootlin.com Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-pwm@vger.kernel.org, linux-rtc@vger.kernel.org Subject: [PATCH v1 8/9] pwm: Add Nuvoton NCT6694 PWM support Date: Thu, 24 Oct 2024 16:59:21 +0800 Message-Id: <20241024085922.133071-9-tmyu0@nuvoton.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241024085922.133071-1-tmyu0@nuvoton.com> References: <20241024085922.133071-1-tmyu0@nuvoton.com> Precedence: bulk X-Mailing-List: linux-watchdog@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This driver supports PWM functionality for NCT6694 MFD device based on USB interface. Signed-off-by: Ming Yu --- MAINTAINERS | 1 + drivers/pwm/Kconfig | 10 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-nct6694.c | 245 ++++++++++++++++++++++++++++++++++++++ 4 files changed, 257 insertions(+) create mode 100644 drivers/pwm/pwm-nct6694.c diff --git a/MAINTAINERS b/MAINTAINERS index 5c350eac187d..4d5a5eded3b9 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16444,6 +16444,7 @@ F: drivers/iio/adc/nct6694_adc.c F: drivers/i2c/busses/i2c-nct6694.c F: drivers/mfd/nct6694.c F: drivers/net/can/nct6694_canfd.c +F: drivers/pwm/pwm-nct6694.c F: drivers/watchdog/nct6694_wdt.c F: include/linux/mfd/nct6694.h diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 0915c1e7df16..00b5eb13f99d 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -471,6 +471,16 @@ config PWM_NTXEC controller found in certain e-book readers designed by the original design manufacturer Netronix. +config PWM_NCT6694 + tristate "Nuvoton NCT6694 PWM support" + depends on MFD_NCT6694 + help + If you say yes to this option, support will be included for Nuvoton + NCT6694, a USB device to PWM controller. + + This driver can also be built as a module. If so, the module + will be called pwm-nct6694. + config PWM_OMAP_DMTIMER tristate "OMAP Dual-Mode Timer PWM support" depends on OF diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 9081e0c0e9e0..5c5602b79402 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -42,6 +42,7 @@ obj-$(CONFIG_PWM_MICROCHIP_CORE) += pwm-microchip-core.o obj-$(CONFIG_PWM_MTK_DISP) += pwm-mtk-disp.o obj-$(CONFIG_PWM_MXS) += pwm-mxs.o obj-$(CONFIG_PWM_NTXEC) += pwm-ntxec.o +obj-$(CONFIG_PWM_NCT6694) += pwm-nct6694.o obj-$(CONFIG_PWM_OMAP_DMTIMER) += pwm-omap-dmtimer.o obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o obj-$(CONFIG_PWM_PXA) += pwm-pxa.o diff --git a/drivers/pwm/pwm-nct6694.c b/drivers/pwm/pwm-nct6694.c new file mode 100644 index 000000000000..915a2ab50834 --- /dev/null +++ b/drivers/pwm/pwm-nct6694.c @@ -0,0 +1,245 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Nuvoton NCT6694 PWM driver based on USB interface. + * + * Copyright (C) 2024 Nuvoton Technology Corp. + */ + +#include +#include +#include +#include +#include +#include + +#define DRVNAME "nct6694-pwm" + +#define NR_PWM 10 +#define MAX_PERIOD_NS 40000 /* PWM Maximum Frequency = 25kHz */ +#define PERIOD_NS_CONST 10200000 /* Period_ns to Freq_reg */ + +/* Host interface */ +#define REQUEST_RPT_MOD 0xFF +#define REQUEST_HWMON_MOD 0x00 +#define REQUEST_PWM_MOD 0x01 + +/* Report Channel */ +#define HWMON_PWM_IDX(x) (0x70 + (x)) + +/* Message Channel -HWMON */ +/* Command 00h */ +#define REQUEST_HWMON_CMD0_LEN 0x40 +#define REQUEST_HWMON_CMD0_OFFSET 0x0000 /* OFFSET = SEL|CMD */ +#define HWMON_PWM_EN(x) (0x06 + (x)) +#define HWMON_PWM_PP(x) (0x08 + (x)) +#define HWMON_PWM_FREQ_IDX(x) (0x30 + (x)) + +/* Message Channel -FAN */ +/* Command 00h */ +#define REQUEST_PWM_CMD0_LEN 0x08 +#define REQUEST_PWM_CMD0_OFFSET 0x0000 /* OFFSET = SEL|CMD */ +#define PWM_CH_EN(x) (x ? 0x00 : 0x01) +/* Command 01h */ +#define REQUEST_PWM_CMD1_LEN 0x20 +#define REQUEST_PWM_CMD1_OFFSET 0x0001 /* OFFSET = SEL|CMD */ +#define PWM_MAL_EN(x) (x ? 0x00 : 0x01) +#define PWM_MAL_VAL(x) (0x02 + (x)) + +/* + * Frequency <-> Period + * (10^9 * 255) / (25000 * Freq_reg) = Period_ns + * 10200000 / Freq_reg = Period_ns + * + * | Freq_reg | Freq_Hz | Period_ns | + * | 1 (01h | 98.039 | 10200000 | + * | 2 (02h) | 196.078 | 5100000 | + * | 3 (03h) | 294.117 | 3400000 | + * | ... | + * | ... | + * | ... | + * | 253 (FDh)| 24803.9 | 40316.20 | + * | 254 (FEh)| 24901.9 | 40157.48 | + * | 255 (FFh)| 25000 | 40000 | + * + */ + +struct nct6694_pwm_data { + struct nct6694 *nct6694; + unsigned char hwmon_cmd0_buf[REQUEST_HWMON_CMD0_LEN]; + unsigned char pwm_cmd0_buf[REQUEST_PWM_CMD0_LEN]; + unsigned char pwm_cmd1_buf[REQUEST_PWM_CMD1_LEN]; +}; + +static inline struct nct6694_pwm_data *to_nct6694_pwm_data(struct pwm_chip *chip) +{ + return pwmchip_get_drvdata(chip); +} + +static int nct6694_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct nct6694_pwm_data *data = to_nct6694_pwm_data(chip); + unsigned char ch_enable = data->pwm_cmd0_buf[PWM_CH_EN(pwm->hwpwm / 8)]; + unsigned char mal_enable = data->pwm_cmd1_buf[PWM_MAL_EN(pwm->hwpwm / 8)]; + bool ch_en = ch_enable & BIT(pwm->hwpwm % 8); + bool mal_en = mal_enable & BIT(pwm->hwpwm % 8); + + if (!(ch_en && mal_en)) { + pr_err("%s: PWM(%d) is running in other mode!\n", + __func__, pwm->hwpwm); + return -EINVAL; + } + + return 0; +} + +static int nct6694_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) +{ + struct nct6694_pwm_data *data = to_nct6694_pwm_data(chip); + unsigned char freq_reg, duty; + + /* Get pwm device initial state */ + state->enabled = true; + + freq_reg = data->hwmon_cmd0_buf[HWMON_PWM_FREQ_IDX(pwm->hwpwm)]; + state->period = PERIOD_NS_CONST / freq_reg; + + duty = data->pwm_cmd1_buf[PWM_MAL_VAL(pwm->hwpwm)]; + state->duty_cycle = duty * state->period / 0xFF; + + return 0; +} + +static int nct6694_pwm_apply(struct pwm_chip *chip, + struct pwm_device *pwm, + const struct pwm_state *state) +{ + struct nct6694_pwm_data *data = to_nct6694_pwm_data(chip); + unsigned char freq_reg, duty; + int ret; + + if (state->period < MAX_PERIOD_NS) + return -EINVAL; + + /* (10^9 * 255) / (25000 * Freq_reg) = Period_ns */ + freq_reg = (unsigned char)(PERIOD_NS_CONST / state->period); + data->hwmon_cmd0_buf[HWMON_PWM_FREQ_IDX(pwm->hwpwm)] = freq_reg; + ret = nct6694_write_msg(data->nct6694, REQUEST_HWMON_MOD, + REQUEST_HWMON_CMD0_OFFSET, + REQUEST_HWMON_CMD0_LEN, + data->hwmon_cmd0_buf); + if (ret) + return -EIO; + + /* Duty = duty * 0xFF */ + duty = (unsigned char)(state->duty_cycle * 0xFF / state->period); + data->pwm_cmd1_buf[PWM_MAL_VAL(pwm->hwpwm)] = duty; + if (state->enabled) + data->pwm_cmd1_buf[PWM_MAL_EN(pwm->hwpwm / 8)] |= BIT(pwm->hwpwm % 8); + else + data->pwm_cmd1_buf[PWM_MAL_EN(pwm->hwpwm / 8)] &= ~BIT(pwm->hwpwm % 8); + ret = nct6694_write_msg(data->nct6694, REQUEST_PWM_MOD, + REQUEST_PWM_CMD1_OFFSET, REQUEST_PWM_CMD1_LEN, + data->pwm_cmd1_buf); + if (ret) + return -EIO; + + return 0; +} + +static const struct pwm_ops nct6694_pwm_ops = { + .request = nct6694_pwm_request, + .apply = nct6694_pwm_apply, + .get_state = nct6694_pwm_get_state, +}; + +static int nct6694_pwm_init(struct nct6694_pwm_data *data) +{ + struct nct6694 *nct6694 = data->nct6694; + int ret; + + ret = nct6694_read_msg(nct6694, REQUEST_HWMON_MOD, + REQUEST_HWMON_CMD0_OFFSET, + REQUEST_HWMON_CMD0_LEN, 0, + REQUEST_HWMON_CMD0_LEN, + data->hwmon_cmd0_buf); + if (ret) + return ret; + + ret = nct6694_read_msg(nct6694, REQUEST_PWM_MOD, + REQUEST_PWM_CMD0_OFFSET, + REQUEST_PWM_CMD0_LEN, 0, + REQUEST_PWM_CMD0_LEN, + data->pwm_cmd0_buf); + if (ret) + return ret; + + ret = nct6694_read_msg(nct6694, REQUEST_PWM_MOD, + REQUEST_PWM_CMD1_OFFSET, + REQUEST_PWM_CMD1_LEN, 0, + REQUEST_PWM_CMD1_LEN, + data->pwm_cmd1_buf); + return ret; +} + +static int nct6694_pwm_probe(struct platform_device *pdev) +{ + struct pwm_chip *chip; + struct nct6694_pwm_data *data; + struct nct6694 *nct6694 = dev_get_drvdata(pdev->dev.parent); + int ret; + + chip = devm_pwmchip_alloc(&pdev->dev, NR_PWM, sizeof(*data)); + if (IS_ERR(chip)) + return PTR_ERR(chip); + + data = to_nct6694_pwm_data(chip); + + data->nct6694 = nct6694; + chip->ops = &nct6694_pwm_ops; + + ret = nct6694_pwm_init(data); + if (ret) + return -EIO; + + /* Register pwm device to PWM framework */ + ret = devm_pwmchip_add(&pdev->dev, chip); + if (ret) { + dev_err(&pdev->dev, "Failed to register pwm device!\n"); + return ret; + } + + return 0; +} + +static struct platform_driver nct6694_pwm_driver = { + .driver = { + .name = DRVNAME, + }, + .probe = nct6694_pwm_probe, +}; + +static int __init nct6694_init(void) +{ + int err; + + err = platform_driver_register(&nct6694_pwm_driver); + if (!err) { + if (err) + platform_driver_unregister(&nct6694_pwm_driver); + } + + return err; +} +subsys_initcall(nct6694_init); + +static void __exit nct6694_exit(void) +{ + platform_driver_unregister(&nct6694_pwm_driver); +} +module_exit(nct6694_exit); + +MODULE_DESCRIPTION("USB-PWM driver for NCT6694"); +MODULE_AUTHOR("Ming Yu "); +MODULE_LICENSE("GPL");