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Message-ID: <20180621224616.GA14487@roeck-us.net>
Date: Thu, 21 Jun 2018 15:46:16 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Tomer Maimon <tmaimon77@...il.com>
Cc: robh+dt@...nel.org, mark.rutland@....com, jdelvare@...e.com,
avifishman70@...il.com, yuenn@...gle.com,
brendanhiggins@...gle.com, venture@...gle.com, joel@....id.au,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org, openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v3 2/2] hwmon: npcm750: add NPCM7xx PWM and Fan driver
On Fri, Jun 22, 2018 at 01:09:57AM +0300, Tomer Maimon wrote:
> Add Nuvoton BMC NPCM7xx Pulse Width Modulation (PWM) and Fan tacho driver.
>
Please refer to specific devices here and wherever the device name
is referenced. We don't know if there is going to be a NPCM723 which is
all different.
:1,$s/NPCM7XX/NPCM750/g
> The Nuvoton BMC NPCM7xx has two identical PWM controller modules,
> each module has four PWM controller outputs and eight identical Fan
> controller modules, each module has two Fan controller inputs.
>
> The driver provides a sysfs entries through which the user can
> configure the duty-cycle value from 0(off) and 255(full speed)
> and read the fan tacho rpm value.
>
> The driver support cooling device creation, that could be bound
> to a thermal zone for the thermal control.
>
> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>
> ---
> Documentation/hwmon/npcm750-pwm-fan | 22 +
> drivers/hwmon/Kconfig | 7 +
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/npcm750-pwm-fan.c | 1073 +++++++++++++++++++++++++++++++++++
> 4 files changed, 1103 insertions(+)
> create mode 100644 Documentation/hwmon/npcm750-pwm-fan
> create mode 100644 drivers/hwmon/npcm750-pwm-fan.c
>
> diff --git a/Documentation/hwmon/npcm750-pwm-fan b/Documentation/hwmon/npcm750-pwm-fan
> new file mode 100644
> index 000000000000..626572bfd04b
> --- /dev/null
> +++ b/Documentation/hwmon/npcm750-pwm-fan
> @@ -0,0 +1,22 @@
> +Kernel driver npcm750-pwm-fan
> +=============================
> +
> +Supported chip:
> + NUVOTON NPCM7XX
> +
> +Authors:
> + <tomer.maimon@...oton.com>
> +
> +Description:
> +------------
> +This driver implements support for NUVOTON NPCM7XX PWM and Fan Tacho
> +controller. The PWM controller supports upto 8 PWM outputs. The Fan tacho
> +controller supports up to 16 tachometer inputs.
> +
> +The driver provides the following sensor accesses in sysfs:
> +
> +fanX_input ro provide current fan rotation value in RPM as reported
> + by the fan to the device.
> +
> +pwmX rw get or set PWM fan control value. This is an integer
> + value between 0(off) and 255(full speed).
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index f10840ad465c..f6c2eff9bb7d 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1888,6 +1888,13 @@ config SENSORS_XGENE
> If you say yes here you get support for the temperature
> and power sensors for APM X-Gene SoC.
>
> +config SENSORS_NPCM7XX
> + tristate "Nuvoton NPCM7XX PWM and Fan driver"
> + depends on THERMAL || THERMAL=n
> + help
> + This driver provides support for Nuvoton NPCM7XX PWM and Fan
> + controllers.
> +
> if ACPI
>
> comment "ACPI drivers"
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index e7d52a36e6c4..004e2ec5b68f 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -174,6 +174,7 @@ obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o
> obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o
> obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o
> obj-$(CONFIG_SENSORS_XGENE) += xgene-hwmon.o
> +obj-$(CONFIG_SENSORS_NPCM7XX) += npcm750-pwm-fan.o
>
> obj-$(CONFIG_PMBUS) += pmbus/
>
> diff --git a/drivers/hwmon/npcm750-pwm-fan.c b/drivers/hwmon/npcm750-pwm-fan.c
> new file mode 100644
> index 000000000000..ceb8473c50f8
> --- /dev/null
> +++ b/drivers/hwmon/npcm750-pwm-fan.c
> @@ -0,0 +1,1073 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2014-2018 Nuvoton Technology corporation.
> +
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/spinlock.h>
> +#include <linux/sysfs.h>
> +#include <linux/thermal.h>
> +
> +/* NPCM7XX PWM registers */
> +#define NPCM7XX_PWM_REG_BASE(base, n) ((base) + ((n) * 0x1000L))
> +
> +#define NPCM7XX_PWM_REG_PR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x00)
> +#define NPCM7XX_PWM_REG_CSR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x04)
> +#define NPCM7XX_PWM_REG_CR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x08)
> +#define NPCM7XX_PWM_REG_CNRx(base, n, ch) \
> + (NPCM7XX_PWM_REG_BASE(base, n) + 0x0C + (12 * (ch)))
> +#define NPCM7XX_PWM_REG_CMRx(base, n, ch) \
> + (NPCM7XX_PWM_REG_BASE(base, n) + 0x10 + (12 * (ch)))
> +#define NPCM7XX_PWM_REG_PDRx(base, n, ch) \
> + (NPCM7XX_PWM_REG_BASE(base, n) + 0x14 + (12 * (ch)))
> +#define NPCM7XX_PWM_REG_PIER(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x3C)
> +#define NPCM7XX_PWM_REG_PIIR(base, n) (NPCM7XX_PWM_REG_BASE(base, n) + 0x40)
> +
> +#define NPCM7XX_PWM_CTRL_CH0_MODE_BIT BIT(3)
> +#define NPCM7XX_PWM_CTRL_CH1_MODE_BIT BIT(11)
> +#define NPCM7XX_PWM_CTRL_CH2_MODE_BIT BIT(15)
> +#define NPCM7XX_PWM_CTRL_CH3_MODE_BIT BIT(19)
> +
> +#define NPCM7XX_PWM_CTRL_CH0_INV_BIT BIT(2)
> +#define NPCM7XX_PWM_CTRL_CH1_INV_BIT BIT(10)
> +#define NPCM7XX_PWM_CTRL_CH2_INV_BIT BIT(14)
> +#define NPCM7XX_PWM_CTRL_CH3_INV_BIT BIT(18)
> +
> +#define NPCM7XX_PWM_CTRL_CH0_EN_BIT BIT(0)
> +#define NPCM7XX_PWM_CTRL_CH1_EN_BIT BIT(8)
> +#define NPCM7XX_PWM_CTRL_CH2_EN_BIT BIT(12)
> +#define NPCM7XX_PWM_CTRL_CH3_EN_BIT BIT(16)
> +
> +/* Define the maximum PWM channel number */
> +#define NPCM7XX_PWM_MAX_CHN_NUM 8
> +#define NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE 4
> +#define NPCM7XX_PWM_MAX_MODULES 2
> +
> +/* Define the Counter Register, value = 100 for match 100% */
> +#define NPCM7XX_PWM_COUNTER_DEFALUT_NUM 255
> +#define NPCM7XX_PWM_COMPARATOR_DEFALUT_NUM 127
> +
still ...
1,$s/DEFALUT/DEFAULT/g
> +#define NPCM7XX_PWM_COMPARATOR_MAX 255
> +
> +/* default all PWM channels PRESCALE2 = 1 */
> +#define NPCM7XX_PWM_PRESCALE2_DEFALUT_CH0 0x4
> +#define NPCM7XX_PWM_PRESCALE2_DEFALUT_CH1 0x40
> +#define NPCM7XX_PWM_PRESCALE2_DEFALUT_CH2 0x400
> +#define NPCM7XX_PWM_PRESCALE2_DEFALUT_CH3 0x4000
> +
> +#define PWM_OUTPUT_FREQ_25KHZ 25000
> +#define PWN_CNT_DEFAULT 256
> +#define MIN_PRESCALE1 2
> +#define NPCM7XX_PWM_PRESCALE_SHIFT_CH01 8
> +
> +#define NPCM7XX_PWM_PRESCALE2_DEFALUT (NPCM7XX_PWM_PRESCALE2_DEFALUT_CH0 | \
> + NPCM7XX_PWM_PRESCALE2_DEFALUT_CH1 | \
> + NPCM7XX_PWM_PRESCALE2_DEFALUT_CH2 | \
> + NPCM7XX_PWM_PRESCALE2_DEFALUT_CH3)
> +
> +#define NPCM7XX_PWM_CTRL_MODE_DEFALUT (NPCM7XX_PWM_CTRL_CH0_MODE_BIT | \
> + NPCM7XX_PWM_CTRL_CH1_MODE_BIT | \
> + NPCM7XX_PWM_CTRL_CH2_MODE_BIT | \
> + NPCM7XX_PWM_CTRL_CH3_MODE_BIT)
> +
> +/* NPCM7XX FAN Tacho registers */
> +#define NPCM7XX_FAN_REG_BASE(base, n) ((base) + ((n) * 0x1000L))
> +
> +#define NPCM7XX_FAN_REG_TCNT1(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x00)
> +#define NPCM7XX_FAN_REG_TCRA(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x02)
> +#define NPCM7XX_FAN_REG_TCRB(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x04)
> +#define NPCM7XX_FAN_REG_TCNT2(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x06)
> +#define NPCM7XX_FAN_REG_TPRSC(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x08)
> +#define NPCM7XX_FAN_REG_TCKC(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0A)
> +#define NPCM7XX_FAN_REG_TMCTRL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0C)
> +#define NPCM7XX_FAN_REG_TICTRL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x0E)
> +#define NPCM7XX_FAN_REG_TICLR(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x10)
> +#define NPCM7XX_FAN_REG_TIEN(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x12)
> +#define NPCM7XX_FAN_REG_TCPA(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x14)
> +#define NPCM7XX_FAN_REG_TCPB(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x16)
> +#define NPCM7XX_FAN_REG_TCPCFG(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x18)
> +#define NPCM7XX_FAN_REG_TINASEL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x1A)
> +#define NPCM7XX_FAN_REG_TINBSEL(base, n) (NPCM7XX_FAN_REG_BASE(base, n) + 0x1C)
> +
> +#define NPCM7XX_FAN_TCKC_CLKX_NONE 0
> +#define NPCM7XX_FAN_TCKC_CLK1_APB BIT(0)
> +#define NPCM7XX_FAN_TCKC_CLK2_APB BIT(3)
> +
> +#define NPCM7XX_FAN_TMCTRL_TBEN BIT(6)
> +#define NPCM7XX_FAN_TMCTRL_TAEN BIT(5)
> +#define NPCM7XX_FAN_TMCTRL_TBEDG BIT(4)
> +#define NPCM7XX_FAN_TMCTRL_TAEDG BIT(3)
> +#define NPCM7XX_FAN_TMCTRL_MODE_5 BIT(2)
> +
> +#define NPCM7XX_FAN_TICLR_CLEAR_ALL GENMASK(5, 0)
> +#define NPCM7XX_FAN_TICLR_TFCLR BIT(5)
> +#define NPCM7XX_FAN_TICLR_TECLR BIT(4)
> +#define NPCM7XX_FAN_TICLR_TDCLR BIT(3)
> +#define NPCM7XX_FAN_TICLR_TCCLR BIT(2)
> +#define NPCM7XX_FAN_TICLR_TBCLR BIT(1)
> +#define NPCM7XX_FAN_TICLR_TACLR BIT(0)
> +
> +#define NPCM7XX_FAN_TIEN_ENABLE_ALL GENMASK(5, 0)
> +#define NPCM7XX_FAN_TIEN_TFIEN BIT(5)
> +#define NPCM7XX_FAN_TIEN_TEIEN BIT(4)
> +#define NPCM7XX_FAN_TIEN_TDIEN BIT(3)
> +#define NPCM7XX_FAN_TIEN_TCIEN BIT(2)
> +#define NPCM7XX_FAN_TIEN_TBIEN BIT(1)
> +#define NPCM7XX_FAN_TIEN_TAIEN BIT(0)
> +
> +#define NPCM7XX_FAN_TICTRL_TFPND BIT(5)
> +#define NPCM7XX_FAN_TICTRL_TEPND BIT(4)
> +#define NPCM7XX_FAN_TICTRL_TDPND BIT(3)
> +#define NPCM7XX_FAN_TICTRL_TCPND BIT(2)
> +#define NPCM7XX_FAN_TICTRL_TBPND BIT(1)
> +#define NPCM7XX_FAN_TICTRL_TAPND BIT(0)
> +
> +#define NPCM7XX_FAN_TCPCFG_HIBEN BIT(7)
> +#define NPCM7XX_FAN_TCPCFG_EQBEN BIT(6)
> +#define NPCM7XX_FAN_TCPCFG_LOBEN BIT(5)
> +#define NPCM7XX_FAN_TCPCFG_CPBSEL BIT(4)
> +#define NPCM7XX_FAN_TCPCFG_HIAEN BIT(3)
> +#define NPCM7XX_FAN_TCPCFG_EQAEN BIT(2)
> +#define NPCM7XX_FAN_TCPCFG_LOAEN BIT(1)
> +#define NPCM7XX_FAN_TCPCFG_CPASEL BIT(0)
> +
> +/* FAN General Definition */
> +/* Define the maximum FAN channel number */
> +#define NPCM7XX_FAN_MAX_MODULE 8
> +#define NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE 2
> +#define NPCM7XX_FAN_MAX_CHN_NUM 16
> +
> +/*
> + * Get Fan Tach Timeout (base on clock 214843.75Hz, 1 cnt = 4.654us)
> + * Timeout 94ms ~= 0x5000
> + * (The minimum FAN speed could to support ~640RPM/pulse 1,
> + * 320RPM/pulse 2, ...-- 10.6Hz)
> + */
> +#define NPCM7XX_FAN_TIMEOUT 0x5000
> +#define NPCM7XX_FAN_TCNT 0xFFFF
> +#define NPCM7XX_FAN_TCPA (NPCM7XX_FAN_TCNT - NPCM7XX_FAN_TIMEOUT)
> +#define NPCM7XX_FAN_TCPB (NPCM7XX_FAN_TCNT - NPCM7XX_FAN_TIMEOUT)
> +
> +#define NPCM7XX_FAN_POLL_TIMER_200MS 200
> +#define NPCM7XX_FAN_DEFAULT_PULSE_PER_REVOLUTION 2
> +#define NPCM7XX_FAN_TINASEL_FANIN_DEFAULT 0
> +#define NPCM7XX_FAN_CLK_PRESCALE 255
> +
> +#define NPCM7XX_FAN_CMPA 0
> +#define NPCM7XX_FAN_CMPB 1
> +
> +/* Obtain the fan number */
> +#define NPCM7XX_FAN_INPUT(fan, cmp) (((fan) << 1) + (cmp))
> +
> +/* fan sample status */
> +#define FAN_DISABLE 0xFF
> +#define FAN_INIT 0x00
> +#define FAN_PREPARE_TO_GET_FIRST_CAPTURE 0x01
> +#define FAN_ENOUGH_SAMPLE 0x02
> +
> +struct fan_dev {
> + u8 fan_st_flg;
> + u8 fan_pls_per_rev;
> + u16 fan_cnt;
> + u32 fan_cnt_tmp;
> +};
> +
> +struct npcm7xx_cooling_device {
> + char name[THERMAL_NAME_LENGTH];
> + struct npcm7xx_pwm_fan_data *data;
> + struct thermal_cooling_device *tcdev;
> + int pwm_port;
> + u8 *cooling_levels;
> + u8 max_state;
> + u8 cur_state;
> +};
> +
> +struct npcm7xx_pwm_fan_data {
> + void __iomem *pwm_base, *fan_base;
> + unsigned long pwm_clk_freq, fan_clk_freq;
> + struct clk *pwm_clk, *fan_clk;
Guess I wasn't explicit enough. All variable declarations in structures
on a single line, please. Sorry, my fault.
> + struct mutex npcm7xx_pwm_lock[NPCM7XX_PWM_MAX_MODULES];
> + spinlock_t npcm7xx_fan_lock[NPCM7XX_FAN_MAX_MODULE];
> + int fan_irq[NPCM7XX_FAN_MAX_MODULE];
> + bool pwm_present[NPCM7XX_PWM_MAX_CHN_NUM];
> + bool fan_present[NPCM7XX_FAN_MAX_CHN_NUM];
> + u32 input_clk_freq;
> + struct timer_list npcm7xx_fan_timer;
> + struct fan_dev npcm7xx_fan[NPCM7XX_FAN_MAX_CHN_NUM];
> + struct npcm7xx_cooling_device *cdev[NPCM7XX_PWM_MAX_CHN_NUM];
> + u8 npcm7xx_fan_select;
The npcm7xx_ in those variable declarations is unnecessary.
> +};
> +
> +static int npcm7xx_pwm_config_set(struct npcm7xx_pwm_fan_data *data,
> + int channel, u16 val)
> +{
> + u32 pwm_ch = (channel % NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
> + u32 module = (channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
> + u32 tmp_buf = 0, ctrl_en_bit, env_bit;
Unnecessary initialization.
> +
> + /*
> + * Config PWM Comparator register for setting duty cycle
> + */
> + if (val > NPCM7XX_PWM_COMPARATOR_MAX)
> + return -EINVAL;
> +
> + mutex_lock(&data->npcm7xx_pwm_lock[module]);
> +
> + /* write new CMR value */
> + iowrite32(val, NPCM7XX_PWM_REG_CMRx(data->pwm_base, module, pwm_ch));
> + tmp_buf = ioread32(NPCM7XX_PWM_REG_CR(data->pwm_base, module));
> +
> + switch (pwm_ch) {
> + case 0:
> + ctrl_en_bit = NPCM7XX_PWM_CTRL_CH0_EN_BIT;
> + env_bit = NPCM7XX_PWM_CTRL_CH0_INV_BIT;
> + break;
> + case 1:
> + ctrl_en_bit = NPCM7XX_PWM_CTRL_CH1_EN_BIT;
> + env_bit = NPCM7XX_PWM_CTRL_CH1_INV_BIT;
> + break;
> + case 2:
> + ctrl_en_bit = NPCM7XX_PWM_CTRL_CH2_EN_BIT;
> + env_bit = NPCM7XX_PWM_CTRL_CH2_INV_BIT;
> + break;
> + case 3:
> + ctrl_en_bit = NPCM7XX_PWM_CTRL_CH3_EN_BIT;
> + env_bit = NPCM7XX_PWM_CTRL_CH3_INV_BIT;
> + break;
> + default:
> + return -ENODEV;
> + }
> +
> + if (val == 0) {
> + /* Disable PWM */
> + tmp_buf &= ~ctrl_en_bit;
> + tmp_buf |= env_bit;
> + } else {
> + /* Enable PWM */
> + tmp_buf |= ctrl_en_bit;
> + tmp_buf &= ~env_bit;
> + }
> +
> + iowrite32(tmp_buf, NPCM7XX_PWM_REG_CR(data->pwm_base, module));
> + mutex_unlock(&data->npcm7xx_pwm_lock[module]);
> +
> + return 0;
> +}
> +
> +static inline void npcm7xx_fan_start_capture(struct npcm7xx_pwm_fan_data *data,
> + u8 fan, u8 cmp)
> +{
> + u8 fan_id;
> + u8 reg_mode;
> + u8 reg_int;
> + unsigned long flags;
> +
> + fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
> +
> + /* to check whether any fan tach is enable */
> + if (data->npcm7xx_fan[fan_id].fan_st_flg != FAN_DISABLE) {
> + /* reset status */
> + spin_lock_irqsave(&data->npcm7xx_fan_lock[fan], flags);
> +
> + data->npcm7xx_fan[fan_id].fan_st_flg = FAN_INIT;
> + reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
> +
Please explain why it is not necessary to mask out the bits
which are set below.
> + if (cmp == NPCM7XX_FAN_CMPA) {
> + /* enable interrupt */
> + iowrite8(reg_int | (NPCM7XX_FAN_TIEN_TAIEN |
> + NPCM7XX_FAN_TIEN_TEIEN),
> + NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
> +
> + reg_mode = NPCM7XX_FAN_TCKC_CLK1_APB
> + | ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base,
> + fan));
> +
> + /* start to Capture */
> + iowrite8(reg_mode, NPCM7XX_FAN_REG_TCKC(data->fan_base,
> + fan));
> + } else {
> + /* enable interrupt */
> + iowrite8(reg_int | (NPCM7XX_FAN_TIEN_TBIEN |
> + NPCM7XX_FAN_TIEN_TFIEN),
> + NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
> +
> + reg_mode =
> + NPCM7XX_FAN_TCKC_CLK2_APB
> + | ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base,
> + fan));
> +
> + /* start to Capture */
> + iowrite8(reg_mode,
> + NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
> + }
> +
> + spin_unlock_irqrestore(&data->npcm7xx_fan_lock[fan], flags);
> + }
> +}
> +
> +/*
> + * Enable a background timer to poll fan tach value, (200ms * 4)
> + * to polling all fan
> + */
> +static void npcm7xx_fan_polling(struct timer_list *t)
> +{
> + struct npcm7xx_pwm_fan_data *data;
> + unsigned long flags;
> + int i;
> +
> + data = from_timer(data, t, npcm7xx_fan_timer);
> +
> + /*
> + * Polling two module per one round,
> + * FAN01 & FAN89 / FAN23 & FAN1011 / FAN45 & FAN1213 / FAN67 & FAN1415
> + */
> + for (i = data->npcm7xx_fan_select; i < NPCM7XX_FAN_MAX_MODULE;
> + i = i + 4) {
> + /* clear the flag and reset the counter (TCNT) */
> + spin_lock_irqsave(&data->npcm7xx_fan_lock[i], flags);
> + iowrite8(NPCM7XX_FAN_TICLR_CLEAR_ALL,
> + NPCM7XX_FAN_REG_TICLR(data->fan_base, i));
> + spin_unlock_irqrestore(&data->npcm7xx_fan_lock[i], flags);
> +
> + if (data->fan_present[i * 2]) {
> + spin_lock_irqsave(&data->npcm7xx_fan_lock[i], flags);
> + iowrite16(NPCM7XX_FAN_TCNT,
> + NPCM7XX_FAN_REG_TCNT1(data->fan_base, i));
> + spin_unlock_irqrestore(&data->npcm7xx_fan_lock[i],
> + flags);
> + npcm7xx_fan_start_capture(data, i, NPCM7XX_FAN_CMPA);
> + }
> + if (data->fan_present[(i * 2) + 1]) {
> + spin_lock_irqsave(&data->npcm7xx_fan_lock[i], flags);
> + iowrite16(NPCM7XX_FAN_TCNT,
> + NPCM7XX_FAN_REG_TCNT2(data->fan_base, i));
> + spin_unlock_irqrestore(&data->npcm7xx_fan_lock[i],
> + flags);
> + npcm7xx_fan_start_capture(data, i, NPCM7XX_FAN_CMPB);
> + }
> + }
> +
> + data->npcm7xx_fan_select++;
> + data->npcm7xx_fan_select &= 0x3;
> +
> + /* reset the timer interval */
> + data->npcm7xx_fan_timer.expires = jiffies +
> + msecs_to_jiffies(NPCM7XX_FAN_POLL_TIMER_200MS);
> + add_timer(&data->npcm7xx_fan_timer);
> +}
> +
> +static inline void npcm7xx_fan_compute(struct npcm7xx_pwm_fan_data *data,
> + u8 fan, u8 cmp, u8 fan_id, u8 flag_int,
> + u8 flag_mode, u8 flag_clear)
> +{
> + u8 reg_int;
> + u8 reg_mode;
> + u16 fan_cap;
> +
> + if (cmp == NPCM7XX_FAN_CMPA)
> + fan_cap = ioread16(NPCM7XX_FAN_REG_TCRA(data->fan_base, fan));
> + else
> + fan_cap = ioread16(NPCM7XX_FAN_REG_TCRB(data->fan_base, fan));
> +
> + /* clear capature flag, H/W will auto reset the NPCM7XX_FAN_TCNTx */
> + iowrite8(flag_clear, NPCM7XX_FAN_REG_TICLR(data->fan_base, fan));
> +
> + if (data->npcm7xx_fan[fan_id].fan_st_flg == FAN_INIT) {
> + /* First capture, drop it */
> + data->npcm7xx_fan[fan_id].fan_st_flg =
> + FAN_PREPARE_TO_GET_FIRST_CAPTURE;
> +
> + /* reset counter */
> + data->npcm7xx_fan[fan_id].fan_cnt_tmp = 0;
> + } else if (data->npcm7xx_fan[fan_id].fan_st_flg < FAN_ENOUGH_SAMPLE) {
> + /*
> + * collect the enough sample,
> + * (ex: 2 pulse fan need to get 2 sample)
> + */
> + data->npcm7xx_fan[fan_id].fan_cnt_tmp +=
> + (NPCM7XX_FAN_TCNT - fan_cap);
> +
> + data->npcm7xx_fan[fan_id].fan_st_flg++;
> + } else {
> + /* get enough sample or fan disable */
> + if (data->npcm7xx_fan[fan_id].fan_st_flg == FAN_ENOUGH_SAMPLE) {
> + data->npcm7xx_fan[fan_id].fan_cnt_tmp +=
> + (NPCM7XX_FAN_TCNT - fan_cap);
> +
> + /* compute finial average cnt per pulse */
> + data->npcm7xx_fan[fan_id].fan_cnt =
> + data->npcm7xx_fan[fan_id].fan_cnt_tmp /
> + FAN_ENOUGH_SAMPLE;
> +
> + data->npcm7xx_fan[fan_id].fan_st_flg = FAN_INIT;
> + }
> +
> + reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
> +
> + /* disable interrupt */
> + iowrite8((reg_int & ~flag_int),
> + NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
> + reg_mode = ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
> +
> + /* stop capturing */
> + iowrite8((reg_mode & ~flag_mode),
> + NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
> + }
> +}
> +
> +static inline void npcm7xx_check_cmp(struct npcm7xx_pwm_fan_data *data,
> + u8 fan, u8 cmp, u8 flag)
> +{
> + u8 reg_int;
> + u8 reg_mode;
> + u8 flag_timeout;
> + u8 flag_cap;
> + u8 flag_clear;
> + u8 flag_int;
> + u8 flag_mode;
> + u8 fan_id;
> +
> + fan_id = NPCM7XX_FAN_INPUT(fan, cmp);
> +
> + if (cmp == NPCM7XX_FAN_CMPA) {
> + flag_cap = NPCM7XX_FAN_TICTRL_TAPND;
> + flag_timeout = NPCM7XX_FAN_TICTRL_TEPND;
> + flag_int = NPCM7XX_FAN_TIEN_TAIEN | NPCM7XX_FAN_TIEN_TEIEN;
> + flag_mode = NPCM7XX_FAN_TCKC_CLK1_APB;
> + flag_clear = NPCM7XX_FAN_TICLR_TACLR | NPCM7XX_FAN_TICLR_TECLR;
> + } else {
> + flag_cap = NPCM7XX_FAN_TICTRL_TBPND;
> + flag_timeout = NPCM7XX_FAN_TICTRL_TFPND;
> + flag_int = NPCM7XX_FAN_TIEN_TBIEN | NPCM7XX_FAN_TIEN_TFIEN;
> + flag_mode = NPCM7XX_FAN_TCKC_CLK2_APB;
> + flag_clear = NPCM7XX_FAN_TICLR_TBCLR | NPCM7XX_FAN_TICLR_TFCLR;
> + }
> +
> + if (flag & flag_timeout) {
> + reg_int = ioread8(NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
> +
> + /* disable interrupt */
> + iowrite8((reg_int & ~flag_int),
> + NPCM7XX_FAN_REG_TIEN(data->fan_base, fan));
> +
> + /* clear interrupt flag */
> + iowrite8(flag_clear,
> + NPCM7XX_FAN_REG_TICLR(data->fan_base, fan));
> +
> + reg_mode = ioread8(NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
> +
> + /* stop capturing */
> + iowrite8((reg_mode & ~flag_mode),
> + NPCM7XX_FAN_REG_TCKC(data->fan_base, fan));
> +
> + /*
> + * If timeout occurs (NPCM7XX_FAN_TIMEOUT), the fan doesn't
> + * connect or speed is lower than 10.6Hz (320RPM/pulse2).
> + * In these situation, the RPM output should be zero.
> + */
> + data->npcm7xx_fan[fan_id].fan_cnt = 0;
> + } else {
> + /* input capture is occurred */
> + if (flag & flag_cap)
> + npcm7xx_fan_compute(data, fan, cmp, fan_id, flag_int,
> + flag_mode, flag_clear);
> + }
> +}
> +
> +static irqreturn_t npcm7xx_fan_isr(int irq, void *dev_id)
> +{
> + struct npcm7xx_pwm_fan_data *data = dev_id;
> + unsigned long flags;
> + int module;
> + u8 flag;
> +
> + module = irq - data->fan_irq[0];
> + spin_lock_irqsave(&data->npcm7xx_fan_lock[module], flags);
> +
> + flag = ioread8(NPCM7XX_FAN_REG_TICTRL(data->fan_base, module));
> + if (flag > 0) {
> + npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPA, flag);
> + npcm7xx_check_cmp(data, module, NPCM7XX_FAN_CMPB, flag);
> + spin_unlock_irqrestore(&data->npcm7xx_fan_lock[module], flags);
> + return IRQ_HANDLED;
> + }
> +
> + spin_unlock_irqrestore(&data->npcm7xx_fan_lock[module], flags);
> +
> + return IRQ_NONE;
> +}
> +
> +static int npcm7xx_read_pwm(struct device *dev, u32 attr, int channel,
> + long *val)
> +{
> + struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
> + u32 pmw_ch = (channel % NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
> + u32 module = (channel / NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE);
> +
> + switch (attr) {
> + case hwmon_pwm_input:
> + *val = ioread32
> + (NPCM7XX_PWM_REG_CMRx(data->pwm_base, module, pmw_ch));
> + return 0;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int npcm7xx_write_pwm(struct device *dev, u32 attr, int channel,
> + long val)
> +{
> + struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
> + u16 pwm_val = (u16)(val & 0xFFFF);
Please do a range check. This accepts, for example, a pwm value of 0x10001.
> + int err = 0;
Unnecessary initialization.
> +
> + switch (attr) {
> + case hwmon_pwm_input:
You might want to do the range check here, then you don't have to do it
in npcm7xx_pwm_config_set().
> + err = npcm7xx_pwm_config_set(data, channel, pwm_val);
> + break;
> + default:
> + err = -EOPNOTSUPP;
> + break;
> + }
> +
> + return err;
> +}
> +
> +static umode_t npcm7xx_pwm_is_visible(const void *_data, u32 attr, int channel)
> +{
> + const struct npcm7xx_pwm_fan_data *data = _data;
> +
> + if (!data->pwm_present[channel])
> + return 0;
> +
> + switch (attr) {
> + case hwmon_pwm_input:
> + return 0644;
> + default:
> + return 0;
> + }
> +}
> +
> +static int npcm7xx_read_fan(struct device *dev, u32 attr, int channel,
> + long *val)
> +{
> + struct npcm7xx_pwm_fan_data *data = dev_get_drvdata(dev);
> +
> + switch (attr) {
> + case hwmon_fan_input:
> + *val = 0;
> + if (data->npcm7xx_fan[channel].fan_cnt <= 0)
> + return data->npcm7xx_fan[channel].fan_cnt;
> +
> + /* Convert the raw reading to RPM */
> + if (data->npcm7xx_fan[channel].fan_cnt > 0 &&
> + data->npcm7xx_fan[channel].fan_pls_per_rev > 0)
> + *val = ((data->input_clk_freq * 60) /
> + (data->npcm7xx_fan[channel].fan_cnt *
> + data->npcm7xx_fan[channel].fan_pls_per_rev));
> + return 0;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static umode_t npcm7xx_fan_is_visible(const void *_data, u32 attr, int channel)
> +{
> + const struct npcm7xx_pwm_fan_data *data = _data;
> +
> + if (!data->fan_present[channel])
> + return 0;
> +
> + switch (attr) {
> + case hwmon_fan_input:
> + return 0444;
> + default:
> + return 0;
> + }
> +}
> +
> +static int npcm7xx_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *val)
> +{
> + switch (type) {
> + case hwmon_pwm:
> + return npcm7xx_read_pwm(dev, attr, channel, val);
> + case hwmon_fan:
> + return npcm7xx_read_fan(dev, attr, channel, val);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int npcm7xx_write(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long val)
> +{
> + switch (type) {
> + case hwmon_pwm:
> + return npcm7xx_write_pwm(dev, attr, channel, val);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static umode_t npcm7xx_is_visible(const void *data,
> + enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + switch (type) {
> + case hwmon_pwm:
> + return npcm7xx_pwm_is_visible(data, attr, channel);
> + case hwmon_fan:
> + return npcm7xx_fan_is_visible(data, attr, channel);
> + default:
> + return 0;
> + }
> +}
> +
> +static const u32 npcm7xx_pwm_config[] = {
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + HWMON_PWM_INPUT,
> + 0
> +};
> +
> +static const struct hwmon_channel_info npcm7xx_pwm = {
> + .type = hwmon_pwm,
> + .config = npcm7xx_pwm_config,
> +};
> +
> +static const u32 npcm7xx_fan_config[] = {
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + HWMON_F_INPUT,
> + 0
> +};
> +
> +static const struct hwmon_channel_info npcm7xx_fan = {
> + .type = hwmon_fan,
> + .config = npcm7xx_fan_config,
> +};
> +
> +static const struct hwmon_channel_info *npcm7xx_info[] = {
> + &npcm7xx_pwm,
> + &npcm7xx_fan,
> + NULL
> +};
> +
> +static const struct hwmon_ops npcm7xx_hwmon_ops = {
> + .is_visible = npcm7xx_is_visible,
> + .read = npcm7xx_read,
> + .write = npcm7xx_write,
> +};
> +
> +static const struct hwmon_chip_info npcm7xx_chip_info = {
> + .ops = &npcm7xx_hwmon_ops,
> + .info = npcm7xx_info,
> +};
> +
> +static u32 npcm7xx_pwm_init(struct npcm7xx_pwm_fan_data *data)
> +{
> + int m, ch;
> + u32 prescale_val, output_freq;
> +
> + data->pwm_clk_freq = clk_get_rate(data->pwm_clk);
> +
> + /* Adjust NPCM7xx PWMs output frequency to ~25Khz */
> + output_freq = data->pwm_clk_freq / PWN_CNT_DEFAULT;
> + prescale_val = DIV_ROUND_CLOSEST(output_freq, PWM_OUTPUT_FREQ_25KHZ);
> +
> + /* If prescale_val = 0, then the prescale output clock is stopped */
> + if (prescale_val < MIN_PRESCALE1)
> + prescale_val = MIN_PRESCALE1;
> + /*
> + * prescale_val need to decrement in one because in the PWM Prescale
> + * register the Prescale value increment by one
> + */
> + prescale_val--;
> +
> + /* Setting PWM Prescale Register value register to both modules */
> + prescale_val |= (prescale_val << NPCM7XX_PWM_PRESCALE_SHIFT_CH01);
> +
> + for (m = 0; m < NPCM7XX_PWM_MAX_MODULES ; m++) {
> + iowrite32(prescale_val, NPCM7XX_PWM_REG_PR(data->pwm_base, m));
> + iowrite32(NPCM7XX_PWM_PRESCALE2_DEFALUT,
> + NPCM7XX_PWM_REG_CSR(data->pwm_base, m));
> + iowrite32(NPCM7XX_PWM_CTRL_MODE_DEFALUT,
> + NPCM7XX_PWM_REG_CR(data->pwm_base, m));
> +
> + for (ch = 0; ch < NPCM7XX_PWM_MAX_CHN_NUM_IN_A_MODULE; ch++) {
> + iowrite32(NPCM7XX_PWM_COUNTER_DEFALUT_NUM,
> + NPCM7XX_PWM_REG_CNRx(data->pwm_base, m, ch));
> + }
> + }
> +
> + return output_freq / ((prescale_val & 0xf) + 1);
> +}
> +
> +static void npcm7xx_fan_init(struct npcm7xx_pwm_fan_data *data)
> +{
> + int md;
> + int ch;
> + int i;
> + u32 apb_clk_freq;
> +
> + for (md = 0; md < NPCM7XX_FAN_MAX_MODULE; md++) {
> + /* stop FAN0~7 clock */
> + iowrite8(NPCM7XX_FAN_TCKC_CLKX_NONE,
> + NPCM7XX_FAN_REG_TCKC(data->fan_base, md));
> +
> + /* disable all interrupt */
> + iowrite8(0x00, NPCM7XX_FAN_REG_TIEN(data->fan_base, md));
> +
> + /* clear all interrupt */
> + iowrite8(NPCM7XX_FAN_TICLR_CLEAR_ALL,
> + NPCM7XX_FAN_REG_TICLR(data->fan_base, md));
> +
> + /* set FAN0~7 clock prescaler */
> + iowrite8(NPCM7XX_FAN_CLK_PRESCALE,
> + NPCM7XX_FAN_REG_TPRSC(data->fan_base, md));
> +
> + /* set FAN0~7 mode (high-to-low transition) */
> + iowrite8((NPCM7XX_FAN_TMCTRL_MODE_5 | NPCM7XX_FAN_TMCTRL_TBEN |
> + NPCM7XX_FAN_TMCTRL_TAEN),
> + NPCM7XX_FAN_REG_TMCTRL(data->fan_base, md));
> +
> + /* set FAN0~7 Initial Count/Cap */
> + iowrite16(NPCM7XX_FAN_TCNT,
> + NPCM7XX_FAN_REG_TCNT1(data->fan_base, md));
> + iowrite16(NPCM7XX_FAN_TCNT,
> + NPCM7XX_FAN_REG_TCNT2(data->fan_base, md));
> +
> + /* set FAN0~7 compare (equal to count) */
> + iowrite8((NPCM7XX_FAN_TCPCFG_EQAEN | NPCM7XX_FAN_TCPCFG_EQBEN),
> + NPCM7XX_FAN_REG_TCPCFG(data->fan_base, md));
> +
> + /* set FAN0~7 compare value */
> + iowrite16(NPCM7XX_FAN_TCPA,
> + NPCM7XX_FAN_REG_TCPA(data->fan_base, md));
> + iowrite16(NPCM7XX_FAN_TCPB,
> + NPCM7XX_FAN_REG_TCPB(data->fan_base, md));
> +
> + /* set FAN0~7 fan input FANIN 0~15 */
> + iowrite8(NPCM7XX_FAN_TINASEL_FANIN_DEFAULT,
> + NPCM7XX_FAN_REG_TINASEL(data->fan_base, md));
> + iowrite8(NPCM7XX_FAN_TINASEL_FANIN_DEFAULT,
> + NPCM7XX_FAN_REG_TINBSEL(data->fan_base, md));
> +
> + for (i = 0; i < NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE; i++) {
> + ch = md * NPCM7XX_FAN_MAX_CHN_NUM_IN_A_MODULE + i;
> + data->npcm7xx_fan[ch].fan_st_flg = FAN_DISABLE;
> + data->npcm7xx_fan[ch].fan_pls_per_rev =
> + NPCM7XX_FAN_DEFAULT_PULSE_PER_REVOLUTION;
> + data->npcm7xx_fan[ch].fan_cnt = 0;
> + }
> + }
> +
> + apb_clk_freq = clk_get_rate(data->fan_clk);
> +
> + /* Fan tach input clock = APB clock / prescalar, default is 255. */
> + data->input_clk_freq = apb_clk_freq / (NPCM7XX_FAN_CLK_PRESCALE + 1);
> +}
> +
> +static int
> +npcm7xx_pwm_cz_get_max_state(struct thermal_cooling_device *tcdev,
> + unsigned long *state)
> +{
> + struct npcm7xx_cooling_device *cdev = tcdev->devdata;
> +
> + *state = cdev->max_state;
> +
> + return 0;
> +}
> +
> +static int
> +npcm7xx_pwm_cz_get_cur_state(struct thermal_cooling_device *tcdev,
> + unsigned long *state)
> +{
> + struct npcm7xx_cooling_device *cdev = tcdev->devdata;
> +
> + *state = cdev->cur_state;
> +
> + return 0;
> +}
> +
> +static int
> +npcm7xx_pwm_cz_set_cur_state(struct thermal_cooling_device *tcdev,
> + unsigned long state)
> +{
> + struct npcm7xx_cooling_device *cdev = tcdev->devdata;
> + int ret;
> +
> + if (state > cdev->max_state)
> + return -EINVAL;
> +
> + cdev->cur_state = state;
> + ret = npcm7xx_pwm_config_set(cdev->data, cdev->pwm_port,
> + cdev->cooling_levels[cdev->cur_state]);
> +
> + return ret;
> +}
> +
> +static const struct thermal_cooling_device_ops npcm7xx_pwm_cool_ops = {
> + .get_max_state = npcm7xx_pwm_cz_get_max_state,
> + .get_cur_state = npcm7xx_pwm_cz_get_cur_state,
> + .set_cur_state = npcm7xx_pwm_cz_set_cur_state,
> +};
> +
> +static int npcm7xx_create_pwm_cooling(struct device *dev,
> + struct device_node *child,
> + struct npcm7xx_pwm_fan_data *data,
> + u32 pwm_port, u8 num_levels)
> +{
> + int ret;
> + struct npcm7xx_cooling_device *cdev;
> +
> + cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
> + if (!cdev)
> + return -ENOMEM;
> +
> + cdev->cooling_levels = devm_kzalloc(dev, num_levels, GFP_KERNEL);
> + if (!cdev->cooling_levels)
> + return -ENOMEM;
> +
> + cdev->max_state = num_levels - 1;
> + ret = of_property_read_u8_array(child, "cooling-levels",
> + cdev->cooling_levels,
> + num_levels);
> + if (ret) {
> + dev_err(dev, "Property 'cooling-levels' cannot be read.\n");
> + return ret;
> + }
> + snprintf(cdev->name, THERMAL_NAME_LENGTH, "%s%d", child->name,
> + pwm_port);
> +
> + cdev->tcdev = thermal_of_cooling_device_register(child,
> + cdev->name,
> + cdev,
> + &npcm7xx_pwm_cool_ops);
> + if (IS_ERR(cdev->tcdev))
> + return PTR_ERR(cdev->tcdev);
> +
> + cdev->data = data;
> + cdev->pwm_port = pwm_port;
> +
> + data->cdev[pwm_port] = cdev;
> +
> + return 0;
> +}
> +
> +static int npcm7xx_en_pwm_fan(struct device *dev,
> + struct device_node *child,
> + struct npcm7xx_pwm_fan_data *data)
> +{
> + u8 *fan_ch;
> + u8 pwm_port;
> + int ret, fan_cnt;
> + u8 index, ch;
> +
> + ret = of_property_read_u8(child, "pwm-ch", &pwm_port);
> + if (ret)
> + return ret;
> +
> + data->pwm_present[pwm_port] = true;
> + ret = npcm7xx_pwm_config_set(data, pwm_port,
> + NPCM7XX_PWM_COMPARATOR_DEFALUT_NUM);
> +
> + ret = of_property_count_u8_elems(child, "cooling-levels");
> + if (ret > 0) {
> + ret = npcm7xx_create_pwm_cooling(dev, child, data, pwm_port,
> + ret);
> + if (ret)
> + return ret;
> + }
> +
> + fan_cnt = of_property_count_u8_elems(child, "fan-ch");
> + if (fan_cnt < 1)
> + return -EINVAL;
> +
> + fan_ch = devm_kzalloc(dev, sizeof(*fan_ch) * fan_cnt, GFP_KERNEL);
> + if (!fan_ch)
> + return -ENOMEM;
> +
> + ret = of_property_read_u8_array(child, "fan-ch", fan_ch, fan_cnt);
> + if (ret)
> + return ret;
> +
> + for (ch = 0; ch < fan_cnt; ch++) {
> + index = fan_ch[ch];
> + data->fan_present[index] = true;
> + data->npcm7xx_fan[index].fan_st_flg = FAN_INIT;
> + }
> +
> + return 0;
> +}
> +
> +static int npcm7xx_pwm_fan_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np, *child;
> + struct npcm7xx_pwm_fan_data *data;
> + struct resource *res;
> + struct device *hwmon;
> + char name[20];
> + int ret, cnt;
> + u32 output_freq;
> + u32 i;
> +
> + np = dev->of_node;
> +
> + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pwm_base");
> + if (!res) {
> + dev_err(dev, "PWM of_address_to_resource fail\n");
> + return -ENODEV;
> + }
> +
> + data->pwm_base = devm_ioremap_resource(dev, res);
> + dev_dbg(dev, "pwm base resource is %pR\n", res);
> + if (IS_ERR(data->pwm_base)) {
> + dev_err(dev, "pwm probe failed: can't read pwm base address\n");
> + return PTR_ERR(data->pwm_base);
> + }
> +
> + data->pwm_clk = devm_clk_get(dev, "clk_apb3");
> + if (IS_ERR(data->pwm_clk)) {
> + dev_err(dev, "pwm probe failed: can't read clk.\n");
> + return PTR_ERR(data->pwm_clk);
> + }
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fan_base");
> + if (!res) {
> + dev_err(dev, "fan of_address_to_resource fail\n");
> + return -ENODEV;
> + }
> +
> + data->fan_base = devm_ioremap_resource(dev, res);
> + dev_dbg(dev, "fan base resource is %pR\n", res);
> + if (IS_ERR(data->fan_base)) {
> + dev_err(dev, "fan probe failed: can't read fan base address.\n");
> + return PTR_ERR(data->fan_base);
> + }
> +
> + data->fan_clk = devm_clk_get(dev, "clk_apb4");
> + if (IS_ERR(data->fan_clk)) {
> + dev_err(dev, "FAN probe failed: can't read clk.\n");
> + return PTR_ERR(data->fan_clk);
> + }
> +
> + output_freq = npcm7xx_pwm_init(data);
> + npcm7xx_fan_init(data);
> +
> + for (cnt = 0; cnt < NPCM7XX_PWM_MAX_MODULES ; cnt++)
> + mutex_init(&data->npcm7xx_pwm_lock[cnt]);
> +
> + for (i = 0; i < NPCM7XX_FAN_MAX_MODULE; i++) {
> + spin_lock_init(&data->npcm7xx_fan_lock[i]);
> +
> + data->fan_irq[i] = platform_get_irq(pdev, i);
> + if (data->fan_irq[i] < 0) {
> + dev_err(dev, "%s - failed to map irq %d\n",
> + __func__, i);
> + ret = data->fan_irq[i];
> + goto err_irq;
> + }
> +
> + sprintf(name, "NPCM7XX-FAN-MD%d", i);
> + ret = devm_request_irq(dev, data->fan_irq[i],
> + npcm7xx_fan_isr, 0, name, (void *)data);
> + if (ret) {
> + dev_err(dev, "NPCM7XX: register irq FAN%d failed\n", i);
> + goto err_irq;
> + }
> + }
> +
> + for_each_child_of_node(np, child) {
> + ret = npcm7xx_en_pwm_fan(dev, child, data);
> + if (ret) {
> + dev_err(dev, "npcm7xx_en_pwm_fan failed ret %d\n", ret);
> + of_node_put(child);
> + goto err_irq;
> + }
> + }
> +
> + hwmon = devm_hwmon_device_register_with_info(dev, "npcm7xx_pwm_fan",
> + data, &npcm7xx_chip_info,
> + NULL);
> + if (IS_ERR(hwmon)) {
> + dev_err(dev, "PWM Driver failed - devm_hwmon_device_register_with_groups failed\n");
> + ret = PTR_ERR(hwmon);
> + goto err_irq;
> + }
> +
> + for (i = 0; i < NPCM7XX_FAN_MAX_CHN_NUM; i++) {
> + if (data->fan_present[i]) {
> + /* fan timer initialization */
> + data->npcm7xx_fan_select = 0;
Unnecessary initialization. The data structure is known to be zero
from its allocation.
> + data->npcm7xx_fan_timer.expires = jiffies +
> + msecs_to_jiffies(NPCM7XX_FAN_POLL_TIMER_200MS);
> + timer_setup(&data->npcm7xx_fan_timer,
> + npcm7xx_fan_polling, 0);
> + add_timer(&data->npcm7xx_fan_timer);
> + break;
> + }
> + }
> +
> + pr_info("NPCM7XX PWM-FAN Driver probed, output Freq %dHz[PWM], input Freq %dHz[FAN]\n",
> + output_freq, data->input_clk_freq);
> +
> + return 0;
> +
> +err_irq:
> + for (; i > 0; i--)
> + free_irq(data->fan_irq[i - 1], (void *)data);
Not necessary; you used devm_request_irq() above.
> +
> + return ret;
> +}
> +
> +static const struct of_device_id of_pwm_fan_match_table[] = {
> + { .compatible = "nuvoton,npcm750-pwm-fan", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, of_pwm_fan_match_table);
> +
> +static struct platform_driver npcm7xx_pwm_fan_driver = {
> + .probe = npcm7xx_pwm_fan_probe,
> + .driver = {
> + .name = "npcm7xx_pwm_fan",
> + .of_match_table = of_pwm_fan_match_table,
> + },
> +};
> +
> +module_platform_driver(npcm7xx_pwm_fan_driver);
> +
> +MODULE_DESCRIPTION("Nuvoton NPCM7XX PWM and Fan Tacho driver");
> +MODULE_AUTHOR("Tomer Maimon <tomer.maimon@...oton.com>");
> +MODULE_LICENSE("GPL v2");
> --
> 2.14.1
>
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