RE: [PATCH] Add Silicom Platform Driver
From: Huibin Shi
Date: Sat Aug 19 2023 - 10:21:16 EST
Hi Guenter,
Thanks for your comments. Probably, I should not resubmit patch too rushed. I will add version number to subject and change log in cover letter for next resubmission.
See my comments below. Please let me know whether you accept my explanation.
Henry
-----Original Message-----
From: Guenter Roeck <groeck7@xxxxxxxxx> On Behalf Of Guenter Roeck
Sent: Saturday, August 19, 2023 8:41 AM
To: Henry Shi <henryshi2018@xxxxxxxxx>
Cc: hbshi69@xxxxxxxxxxx; tglx@xxxxxxxxxxxxx; mingo@xxxxxxxxxx; bp@xxxxxxxxx; dave.hansen@xxxxxxxxxxxxxxx; x86@xxxxxxxxxx; hpa@xxxxxxxxx; hdegoede@xxxxxxxxxx; markgross@xxxxxxxxxx; jdelvare@xxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; platform-driver-x86@xxxxxxxxxxxxxxx; linux-hwmon@xxxxxxxxxxxxxxx; hb_shi2003@xxxxxxxxx; Huibin Shi <henrys@xxxxxxxxxxxxxxx>; Wen Wang <wenw@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH] Add Silicom Platform Driver
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On Fri, Aug 18, 2023 at 11:43:41AM -0400, Henry Shi wrote:
Description missing.
Henry: I forgot it for last submission, I realized it after I send out email.
This is at least v4 of this patch. No versioning, no change log.
Henry: Will add version and change log for next submission.
That was commented on before. This is the last time I am going to provide feedback, even more so since most of my previous feedback was ignored.
Note that my comments only refer to problems in hwmon code and do by no means suggest that the rest of the code may be acceptable.
> Signed-off-by: Henry Shi <henryshi2018@xxxxxxxxx>
> ---
> drivers/platform/x86/Kconfig | 11 +
> drivers/platform/x86/Makefile | 1 +
> drivers/platform/x86/silicom-platform.c | 1046
> +++++++++++++++++++++++
> 3 files changed, 1058 insertions(+)
> create mode 100644 drivers/platform/x86/silicom-platform.c
>
> diff --git a/drivers/platform/x86/Kconfig
> b/drivers/platform/x86/Kconfig index 22052031c719..7680c0dbcd8d 100644
> --- a/drivers/platform/x86/Kconfig
> +++ b/drivers/platform/x86/Kconfig
> @@ -188,6 +188,17 @@ config ACER_WMI
> If you have an ACPI-WMI compatible Acer/ Wistron laptop, say Y or M
> here.
>
> +config SILICOM_PLATFORM
> + tristate "Silicom Edge Networking device support"
> + depends on DMI
> + select LEDS_CLASS_MULTICOLOR
> + select GPIOLIB
> + help
> + This option enables support for the LEDs/GPIO/etc downstream of the
> + embedded controller on Silicom "Cordoba" hardware and derivatives.
> +
> + If you have a Silicom network appliance, say Y or M here.
> +
> source "drivers/platform/x86/amd/Kconfig"
>
> config ADV_SWBUTTON
> diff --git a/drivers/platform/x86/Makefile
> b/drivers/platform/x86/Makefile index 2cafe51ec4d8..9355ebbc56ca
> 100644
> --- a/drivers/platform/x86/Makefile
> +++ b/drivers/platform/x86/Makefile
> @@ -113,6 +113,7 @@ obj-$(CONFIG_SERIAL_MULTI_INSTANTIATE) += serial-multi-instantiate.o
> obj-$(CONFIG_MLX_PLATFORM) += mlx-platform.o
> obj-$(CONFIG_TOUCHSCREEN_DMI) += touchscreen_dmi.o
> obj-$(CONFIG_WIRELESS_HOTKEY) += wireless-hotkey.o
> +obj-$(CONFIG_SILICOM_PLATFORM) += silicom-platform.o
> obj-$(CONFIG_X86_ANDROID_TABLETS) += x86-android-tablets/
>
> # Intel uncore drivers
> diff --git a/drivers/platform/x86/silicom-platform.c
> b/drivers/platform/x86/silicom-platform.c
> new file mode 100644
> index 000000000000..ddf9961e2b9e
> --- /dev/null
> +++ b/drivers/platform/x86/silicom-platform.c
> @@ -0,0 +1,1046 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +//
> +// silicom-platform.c - Silicom MEC170x platform driver // //
> +Copyright (C) 2023 Henry Shi <henrys@xxxxxxxxxxxxxxx>
> +
> +#include <linux/dmi.h>
> +#include <linux/gpio/driver.h>
> +#include <linux/init.h>
> +#include <linux/ioport.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/led-class-multicolor.h> #include <linux/module.h>
> +#include <linux/hwmon.h> #include <linux/mutex.h> #include
> +<linux/platform_device.h> #include <linux/string.h> #include
> +<linux/kobject.h> #include <linux/sysfs.h> #include <linux/bits.h>
> +#include <linux/bitfield.h>
> +
> +#define MEC_ADDR ((mec_io_base) + 0x02) #define MEC_DATA(offset)
> +((mec_io_base) + 0x04 + (offset)) #define EC_ADDR_LSB MEC_ADDR
> +#define EC_ADDR_MSB ((mec_io_base) + 0x03) #define SILICOM_MEC_MAGIC
> +0x5a #define OFFSET_BIT_TO_CHANNEL(off, bit) ((((off) + 0x014) << 3)
> +| (bit)) #define CHANNEL_TO_OFFSET(chan) (((chan) >> 3) - 0x14)
> +#define MEC_VERSION_MAJOR GENMASK(15, 14) #define MEC_VERSION_MINOR
> +GENMASK(13, 8) #define IO_REG_BANK 0 #define DEFAULT_CHAN_LO 0
> +#define DEFAULT_CHAN_HI 0 #define MEC_EFUSE_LSB_ADDR 0x28 #define
> +MEC_POWER_CYCLE_ADDR 0x24
> +
> +static DEFINE_MUTEX(mec_io_mutex);
> +static int mec_io_base, mec_io_len;
> +static struct device *my_dev;
> +static int efuse_status;
> +static int mec_uc_version;
> +static int power_cycle;
> +
> +struct silicom_fan_control_data {
> + struct device *hdev;
Unnecessary.
> + int temp;
Unused
Henry: OK, will remove it for next submission.
> + int fan_speed;
Unnecessary.
Henry: OK, will remove it for next submission.
> +};
This entire data structure is unnecessary. I did comment on that before.
> +
> +static const struct hwmon_channel_info *silicom_fan_control_info[] = {
> + HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_LABEL),
> + HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_LABEL),
> + NULL
> +};
> +
> +struct silicom_platform_info {
> + int io_base;
> + int io_len;
> + struct led_classdev_mc *led_info;
> + struct gpio_chip *gpiochip;
> + u8 *gpio_channels;
> + u16 ngpio;
> +};
> +
> +static const char * const plat_0222_gpio_names[] = {
> + "AUTOM0_SFP_TX_FAULT",
> + "SLOT2_LED_OUT",
> + "SIM_M2_SLOT2_B_DET",
> + "SIM_M2_SLOT2_A_DET",
> + "SLOT1_LED_OUT",
> + "SIM_M2_SLOT1_B_DET",
> + "SIM_M2_SLOT1_A_DET",
> + "SLOT0_LED_OUT",
> + "WAN_SFP0_RX_LOS",
> + "WAN_SFP0_PRSNT_N",
> + "WAN_SFP0_TX_FAULT",
> + "AUTOM1_SFP_RX_LOS",
> + "AUTOM1_SFP_PRSNT_N",
> + "AUTOM1_SFP_TX_FAULT",
> + "AUTOM0_SFP_RX_LOS",
> + "AUTOM0_SFP_PRSNT_N",
> + "WAN_SFP1_RX_LOS",
> + "WAN_SFP1_PRSNT_N",
> + "WAN_SFP1_TX_FAULT",
> + "SIM_M2_SLOT1_MUX_SEL",
> + "W_DISABLE_M2_SLOT1_N",
> + "W_DISABLE_MPCIE_SLOT0_N",
> + "W_DISABLE_M2_SLOT0_N",
> + "BT_COMMAND_MODE",
> + "WAN_SFP1_TX_DISABLE",
> + "WAN_SFP0_TX_DISABLE",
> + "AUTOM1_SFP_TX_DISABLE",
> + "AUTOM0_SFP_TX_DISABLE",
> + "SIM_M2_SLOT2_MUX_SEL",
> + "W_DISABLE_M2_SLOT2_N",
> + "RST_CTL_M2_SLOT_1_N",
> + "RST_CTL_M2_SLOT_2_N",
> + "PM_USB_PWR_EN_BOT",
> + "PM_USB_PWR_EN_TOP",
> +};
> +
> +static u8 plat_0222_gpio_channels[] = {
> + OFFSET_BIT_TO_CHANNEL(0x00, 0),
> + OFFSET_BIT_TO_CHANNEL(0x00, 1),
> + OFFSET_BIT_TO_CHANNEL(0x00, 2),
> + OFFSET_BIT_TO_CHANNEL(0x00, 3),
> + OFFSET_BIT_TO_CHANNEL(0x00, 4),
> + OFFSET_BIT_TO_CHANNEL(0x00, 5),
> + OFFSET_BIT_TO_CHANNEL(0x00, 6),
> + OFFSET_BIT_TO_CHANNEL(0x00, 7),
> + OFFSET_BIT_TO_CHANNEL(0x01, 0),
> + OFFSET_BIT_TO_CHANNEL(0x01, 1),
> + OFFSET_BIT_TO_CHANNEL(0x01, 2),
> + OFFSET_BIT_TO_CHANNEL(0x01, 3),
> + OFFSET_BIT_TO_CHANNEL(0x01, 4),
> + OFFSET_BIT_TO_CHANNEL(0x01, 5),
> + OFFSET_BIT_TO_CHANNEL(0x01, 6),
> + OFFSET_BIT_TO_CHANNEL(0x01, 7),
> + OFFSET_BIT_TO_CHANNEL(0x02, 0),
> + OFFSET_BIT_TO_CHANNEL(0x02, 1),
> + OFFSET_BIT_TO_CHANNEL(0x02, 2),
> + OFFSET_BIT_TO_CHANNEL(0x09, 0),
> + OFFSET_BIT_TO_CHANNEL(0x09, 1),
> + OFFSET_BIT_TO_CHANNEL(0x09, 2),
> + OFFSET_BIT_TO_CHANNEL(0x09, 3),
> + OFFSET_BIT_TO_CHANNEL(0x0a, 0),
> + OFFSET_BIT_TO_CHANNEL(0x0a, 1),
> + OFFSET_BIT_TO_CHANNEL(0x0a, 2),
> + OFFSET_BIT_TO_CHANNEL(0x0a, 3),
> + OFFSET_BIT_TO_CHANNEL(0x0a, 4),
> + OFFSET_BIT_TO_CHANNEL(0x0a, 5),
> + OFFSET_BIT_TO_CHANNEL(0x0a, 6),
> + OFFSET_BIT_TO_CHANNEL(0x0b, 0),
> + OFFSET_BIT_TO_CHANNEL(0x0b, 1),
> + OFFSET_BIT_TO_CHANNEL(0x0b, 2),
> + OFFSET_BIT_TO_CHANNEL(0x0b, 3),
> +};
> +
> +static struct platform_device *silicom_platform_dev; static struct
> +led_classdev_mc *silicom_led_info __initdata; static struct gpio_chip
> +*silicom_gpiochip __initdata; static u8 *silicom_gpio_channels
> +__initdata;
> +
> +static int silicom_mec_port_get(unsigned int offset) {
> + u8 reg;
> +
> + mutex_lock(&mec_io_mutex);
> + /* Get the dword offset from the channel */
> + outb((offset >> 3) & 0xfc, MEC_ADDR);
> +
> + /* Get the current register */
> + reg = inb(MEC_DATA((offset >> 3) & 0x03));
> + mutex_unlock(&mec_io_mutex);
> +
> + return (reg >> (offset & 0x7)) & 0x01; }
> +
> +static enum led_brightness silicom_mec_led_get(int channel) {
> + /* Outputs are active low */
> + return silicom_mec_port_get(channel) ? LED_OFF : LED_ON; }
> +
> +static void silicom_mec_port_set(int channel, int on) {
> + u8 reg;
> +
> + mutex_lock(&mec_io_mutex);
> + /* Get the dword offset from the channel */
> + outb((channel >> 3) & 0xfc, MEC_ADDR);
> + /* Get the current port settings */
> + reg = inb(MEC_DATA((channel >> 3) & 0x03));
> + /* Outputs are active low, so clear the bit for on, or set it for off */
> + if (on)
> + reg &= ~(1 << (channel & 0x7));
> + else
> + reg |= 1 << (channel & 0x7);
> + /* Write back the updated register */
> + outb(reg, MEC_DATA((channel >> 3) & 0x03));
> + mutex_unlock(&mec_io_mutex);
> +}
> +
> +static enum led_brightness silicom_mec_led_mc_brightness_get(struct
> +led_classdev *led_cdev) {
> + struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(led_cdev);
> + enum led_brightness brightness = LED_OFF;
> + int i;
> +
> + for (i = 0; i < mc_cdev->num_colors; i++) {
> + mc_cdev->subled_info[i].brightness =
> + silicom_mec_led_get(mc_cdev->subled_info[i].channel);
> + /* Mark the overall brightness as LED_ON if any of the subleds are on */
> + if (mc_cdev->subled_info[i].brightness != LED_OFF)
> + brightness = LED_ON;
> + }
> +
> + return brightness;
> +}
> +
> +static void silicom_mec_led_mc_brightness_set(struct led_classdev *led_cdev,
> +
> +enum led_brightness brightness) {
> + struct led_classdev_mc *mc_cdev = lcdev_to_mccdev(led_cdev);
> + int i;
> +
> + led_mc_calc_color_components(mc_cdev, brightness);
> + for (i = 0; i < mc_cdev->num_colors; i++) {
> + silicom_mec_port_set(mc_cdev->subled_info[i].channel,
> + mc_cdev->subled_info[i].brightness);
> + }
> +}
> +
> +static int silicom_gpio_get_direction(struct gpio_chip *gc, unsigned
> +int offset) {
> + u8 *channels = gpiochip_get_data(gc);
> +
> + /* Input registers have offsets between [0x00, 0x07] */
> + if (CHANNEL_TO_OFFSET(channels[offset]) < 0x08)
> + return GPIO_LINE_DIRECTION_IN;
> +
> + return GPIO_LINE_DIRECTION_OUT;
> +}
> +
> +static int silicom_gpio_direction_input(struct gpio_chip *gc,
> +unsigned int offset) {
> + int direction = silicom_gpio_get_direction(gc, offset);
> +
> + return direction == GPIO_LINE_DIRECTION_IN ? 0 : -EINVAL; }
> +
> +static void silicom_gpio_set(struct gpio_chip *gc, unsigned int
> +offset, int value) {
> + u8 *channels = gpiochip_get_data(gc);
> + int direction = silicom_gpio_get_direction(gc, offset);
> + int channel = channels[offset];
> +
> + if (direction == GPIO_LINE_DIRECTION_IN)
> + return;
> +
> + if (value)
> + silicom_mec_port_set(channel, 0);
> + else if (value == 0)
> + silicom_mec_port_set(channel, 1);
> + else
> + pr_err("Wrong argument value: %d\n", value); }
> +
> +static int silicom_gpio_direction_output(struct gpio_chip *gc,
> +unsigned int offset, int value) {
> + int direction = silicom_gpio_get_direction(gc, offset);
> +
> + if (direction == GPIO_LINE_DIRECTION_IN)
> + return -EINVAL;
> +
> + silicom_gpio_set(gc, offset, value);
> +
> + return 0;
> +}
> +
> +static int silicom_gpio_get(struct gpio_chip *gc, unsigned int
> +offset) {
> + u8 *channels = gpiochip_get_data(gc);
> + int channel = channels[offset];
> +
> + return silicom_mec_port_get(channel); }
> +
> +
> +static struct mc_subled plat_0222_wan_mc_subled_info[] __initdata = {
> + {
> + .color_index = LED_COLOR_ID_WHITE,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0c, 7),
> + },
> + {
> + .color_index = LED_COLOR_ID_YELLOW,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0c, 6),
> + },
> + {
> + .color_index = LED_COLOR_ID_RED,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0c, 5),
> + },
> +};
> +
> +static struct mc_subled plat_0222_sys_mc_subled_info[] __initdata = {
> + {
> + .color_index = LED_COLOR_ID_WHITE,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0c, 4),
> + },
> + {
> + .color_index = LED_COLOR_ID_AMBER,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0c, 3),
> + },
> + {
> + .color_index = LED_COLOR_ID_RED,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0c, 2),
> + },
> +};
> +
> +static struct mc_subled plat_0222_stat1_mc_subled_info[] __initdata = {
> + {
> + .color_index = LED_COLOR_ID_RED,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0c, 1),
> + },
> + {
> + .color_index = LED_COLOR_ID_GREEN,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0c, 0),
> + },
> + {
> + .color_index = LED_COLOR_ID_BLUE,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0d, 7),
> + },
> + {
> + .color_index = LED_COLOR_ID_YELLOW,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0d, 6),
> + },
> +};
> +
> +static struct mc_subled plat_0222_stat2_mc_subled_info[] __initdata = {
> + {
> + .color_index = LED_COLOR_ID_RED,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0d, 5),
> + },
> + {
> + .color_index = LED_COLOR_ID_GREEN,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0d, 4),
> + },
> + {
> + .color_index = LED_COLOR_ID_BLUE,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0d, 3),
> + },
> + {
> + .color_index = LED_COLOR_ID_YELLOW,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0d, 2),
> + },
> +};
> +
> +static struct mc_subled plat_0222_stat3_mc_subled_info[] __initdata = {
> + {
> + .color_index = LED_COLOR_ID_RED,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0d, 1),
> + },
> + {
> + .color_index = LED_COLOR_ID_GREEN,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0d, 0),
> + },
> + {
> + .color_index = LED_COLOR_ID_BLUE,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0e, 1),
> + },
> + {
> + .color_index = LED_COLOR_ID_YELLOW,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x0e, 0),
> + },
> +};
> +
> +static struct led_classdev_mc plat_0222_mc_led_info[] __initdata = {
> + {
> + .led_cdev = {
> + .name = "multicolor:wan",
> + .brightness = 0,
> + .max_brightness = 1,
> + .brightness_set = silicom_mec_led_mc_brightness_set,
> + .brightness_get = silicom_mec_led_mc_brightness_get,
> + },
> + .num_colors = ARRAY_SIZE(plat_0222_wan_mc_subled_info),
> + .subled_info = plat_0222_wan_mc_subled_info,
> + },
> + {
> + .led_cdev = {
> + .name = "multicolor:sys",
> + .brightness = 0,
> + .max_brightness = 1,
> + .brightness_set = silicom_mec_led_mc_brightness_set,
> + .brightness_get = silicom_mec_led_mc_brightness_get,
> + },
> + .num_colors = ARRAY_SIZE(plat_0222_sys_mc_subled_info),
> + .subled_info = plat_0222_sys_mc_subled_info,
> + },
> + {
> + .led_cdev = {
> + .name = "multicolor:stat1",
> + .brightness = 0,
> + .max_brightness = 1,
> + .brightness_set = silicom_mec_led_mc_brightness_set,
> + .brightness_get = silicom_mec_led_mc_brightness_get,
> + },
> + .num_colors = ARRAY_SIZE(plat_0222_stat1_mc_subled_info),
> + .subled_info = plat_0222_stat1_mc_subled_info,
> + },
> + {
> + .led_cdev = {
> + .name = "multicolor:stat2",
> + .brightness = 0,
> + .max_brightness = 1,
> + .brightness_set = silicom_mec_led_mc_brightness_set,
> + .brightness_get = silicom_mec_led_mc_brightness_get,
> + },
> + .num_colors = ARRAY_SIZE(plat_0222_stat2_mc_subled_info),
> + .subled_info = plat_0222_stat2_mc_subled_info,
> + },
> + {
> + .led_cdev = {
> + .name = "multicolor:stat3",
> + .brightness = 0,
> + .max_brightness = 1,
> + .brightness_set = silicom_mec_led_mc_brightness_set,
> + .brightness_get = silicom_mec_led_mc_brightness_get,
> + },
> + .num_colors = ARRAY_SIZE(plat_0222_stat3_mc_subled_info),
> + .subled_info = plat_0222_stat3_mc_subled_info,
> + },
> + { },
> +};
> +
> +static struct gpio_chip silicom_gpio_chip = {
> + .label = "silicom-gpio",
> + .get_direction = silicom_gpio_get_direction,
> + .direction_input = silicom_gpio_direction_input,
> + .direction_output = silicom_gpio_direction_output,
> + .get = silicom_gpio_get,
> + .set = silicom_gpio_set,
> + .base = -1,
> + .ngpio = ARRAY_SIZE(plat_0222_gpio_channels),
> + .names = plat_0222_gpio_names,
> + /* We're using a mutex to protect the indirect access, so we can sleep if the
> + * lock blocks
> + */
> + .can_sleep = true,
> +};
> +
> +static struct silicom_platform_info silicom_plat_0222_cordoba_info __initdata = {
> + .io_base = 0x800,
> + .io_len = 8,
> + .led_info = plat_0222_mc_led_info,
> + .gpiochip = &silicom_gpio_chip,
> + .gpio_channels = plat_0222_gpio_channels,
> + /* The original generic cordoba does not have the last 4 outputs of the plat_0222
> + * BB variant, the rest are the same, so use the same longer list, but ignore the
> + * last entries here
> + */
> + .ngpio = ARRAY_SIZE(plat_0222_gpio_channels),
> +
> +};
> +
> +static struct mc_subled cordoba_fp_left_mc_subled_info[] __initdata = {
> + {
> + .color_index = LED_COLOR_ID_RED,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x08, 6),
> + },
> + {
> + .color_index = LED_COLOR_ID_GREEN,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x08, 5),
> + },
> + {
> + .color_index = LED_COLOR_ID_BLUE,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x09, 7),
> + },
> + {
> + .color_index = LED_COLOR_ID_AMBER,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x09, 4),
> + },
> +};
> +
> +static struct mc_subled cordoba_fp_center_mc_subled_info[] __initdata = {
> + {
> + .color_index = LED_COLOR_ID_RED,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x08, 7),
> + },
> + {
> + .color_index = LED_COLOR_ID_GREEN,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x08, 4),
> + },
> + {
> + .color_index = LED_COLOR_ID_BLUE,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x08, 3),
> + },
> + {
> + .color_index = LED_COLOR_ID_AMBER,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x09, 6),
> + },
> +};
> +
> +static struct mc_subled cordoba_fp_right_mc_subled_info[] __initdata = {
> + {
> + .color_index = LED_COLOR_ID_RED,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x08, 2),
> + },
> + {
> + .color_index = LED_COLOR_ID_GREEN,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x08, 1),
> + },
> + {
> + .color_index = LED_COLOR_ID_BLUE,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x08, 0),
> + },
> + {
> + .color_index = LED_COLOR_ID_AMBER,
> + .brightness = 1,
> + .intensity = 0,
> + .channel = OFFSET_BIT_TO_CHANNEL(0x09, 5),
> + },
> +};
> +
> +static struct led_classdev_mc cordoba_mc_led_info[] __initdata = {
> + {
> + .led_cdev = {
> + .name = "multicolor:fp_left",
> + .brightness = 0,
> + .max_brightness = 1,
> + .brightness_set = silicom_mec_led_mc_brightness_set,
> + .brightness_get = silicom_mec_led_mc_brightness_get,
> + },
> + .num_colors = ARRAY_SIZE(cordoba_fp_left_mc_subled_info),
> + .subled_info = cordoba_fp_left_mc_subled_info,
> + },
> + {
> + .led_cdev = {
> + .name = "multicolor:fp_center",
> + .brightness = 0,
> + .max_brightness = 1,
> + .brightness_set = silicom_mec_led_mc_brightness_set,
> + .brightness_get = silicom_mec_led_mc_brightness_get,
> + },
> + .num_colors = ARRAY_SIZE(cordoba_fp_center_mc_subled_info),
> + .subled_info = cordoba_fp_center_mc_subled_info,
> + },
> + {
> + .led_cdev = {
> + .name = "multicolor:fp_right",
> + .brightness = 0,
> + .max_brightness = 1,
> + .brightness_set = silicom_mec_led_mc_brightness_set,
> + .brightness_get = silicom_mec_led_mc_brightness_get,
> + },
> + .num_colors = ARRAY_SIZE(cordoba_fp_right_mc_subled_info),
> + .subled_info = cordoba_fp_right_mc_subled_info,
> + },
> + { },
> +};
> +
> +static struct silicom_platform_info silicom_generic_cordoba_info __initdata = {
> + .io_base = 0x800,
> + .io_len = 8,
> + .led_info = cordoba_mc_led_info,
> + .gpiochip = &silicom_gpio_chip,
> + .gpio_channels = plat_0222_gpio_channels,
> + .ngpio = ARRAY_SIZE(plat_0222_gpio_channels),
> +};
> +
> +static struct platform_driver silicom_platform_driver = {
> + .driver = {
> + .name = "silicom-platform",
> + },
> +};
> +
> +static ssize_t efuse_status_show(struct device *dev, struct device_attribute *attr,
> + char
> +*buf) {
> + u32 reg;
> +
> + mutex_lock(&mec_io_mutex);
> + /* Select memory region */
> + outb(IO_REG_BANK, EC_ADDR_MSB);
> + outb(MEC_EFUSE_LSB_ADDR, EC_ADDR_LSB);
> +
> + /* Get current data from the address */
> + reg = inl(MEC_DATA(DEFAULT_CHAN_LO));
> + mutex_unlock(&mec_io_mutex);
> +
> + efuse_status = reg & 0x1;
> +
> + return sprintf(buf, "%d\n", efuse_status); }
> +
> +static ssize_t uc_version_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf) {
> + u32 reg;
> + int uc_version;
> +
> + mutex_lock(&mec_io_mutex);
> + outb(IO_REG_BANK, EC_ADDR_MSB);
> + outb(DEFAULT_CHAN_LO, EC_ADDR_LSB);
> +
> + reg = inl(MEC_DATA(DEFAULT_CHAN_LO));
> + mutex_unlock(&mec_io_mutex);
> + uc_version = FIELD_GET(GENMASK(15, 8), reg);
> + if (uc_version >= 192)
> + pr_err("uc version not supported\n");
> +
> + uc_version = FIELD_GET(MEC_VERSION_MAJOR, reg) * 100 +
> + FIELD_GET(MEC_VERSION_MINOR, reg);
> +
> + mec_uc_version = uc_version;
> + return sprintf(buf, "%d\n", mec_uc_version); }
> +
> +static ssize_t power_cycle_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf) {
> + return sprintf(buf, "%d\n", power_cycle); }
> +
> +static void powercycle_uc(void)
> +{
> + mutex_lock(&mec_io_mutex);
> + /* Select memory region */
> + outb(IO_REG_BANK, EC_ADDR_MSB);
> + outb(MEC_POWER_CYCLE_ADDR, EC_ADDR_LSB);
> +
> + /* Set to 1 for current data from the address */
> + outb(1, MEC_DATA(DEFAULT_CHAN_LO));
> + mutex_unlock(&mec_io_mutex);
> +}
> +
> +static ssize_t power_cycle_store(struct device *dev, struct device_attribute *attr,
> + const char *buf, size_t count) {
> + if (sscanf(buf, "%du", &power_cycle) != 1) {
> + dev_err(dev, "Failed to read power_cycle\n");
> + return -EINVAL;
> + }
> + if (power_cycle > 0)
> + powercycle_uc();
> +
> + return count;
> +}
> +
> +static struct device_attribute my_dev_attr[] = {
> + {
> + .attr = {.name = "efuse_status", .mode = 0644},
> + .show = efuse_status_show,
> + .store = NULL
> + },
> + {
> + .attr = {.name = "uc_version", .mode = 0644},
> + .show = uc_version_show,
> + .store = NULL
> + },
> + {
> + .attr = {.name = "power_cycle", .mode = 0644},
> + .show = power_cycle_show,
> + .store = power_cycle_store
> + },
> +};
> +
> +static int __init silicom_mc_leds_register(struct device *dev,
> + const struct led_classdev_mc
> +*mc_leds) {
> + struct led_classdev_mc *led;
> + int i, err;
> +
> + for (i = 0; mc_leds[i].led_cdev.name; i++) {
> + led = devm_kzalloc(dev, sizeof(struct led_classdev_mc), GFP_KERNEL);
> + if (!led)
> + return -ENOMEM;
> + memcpy(led, &mc_leds[i], sizeof(*led));
> +
> + led->subled_info = devm_kzalloc(dev, led->num_colors * sizeof(struct mc_subled), GFP_KERNEL);
> + if (!led->subled_info)
> + return -ENOMEM;
> + memcpy(led->subled_info, mc_leds[i].subled_info,
> + led->num_colors * sizeof(struct mc_subled));
> +
> + err = devm_led_classdev_multicolor_register(dev, led);
> + if (err) {
> + dev_err(dev, "Failed to register[%d]: %d\n", i, err);
> + return err;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static u32 rpm_get(void)
> +{
> + u32 reg;
> +
> + mutex_lock(&mec_io_mutex);
> + /* Select memory region */
> + outb(IO_REG_BANK, EC_ADDR_MSB);
> + outb(0xc, EC_ADDR_LSB);
> + /* Get current data from the address */
> + reg = inw(MEC_DATA(DEFAULT_CHAN_LO));
> + mutex_unlock(&mec_io_mutex);
> +
> + return reg;
> +}
> +
> +static u32 temp_get(void)
> +{
> + u32 reg;
> +
> + mutex_lock(&mec_io_mutex);
> + /* Select memory region */
> + outb(IO_REG_BANK, EC_ADDR_MSB);
> + outb(0xc, EC_ADDR_LSB);
> + /* Get current data from the address */
> + reg = inl(MEC_DATA(DEFAULT_CHAN_LO));
> + mutex_unlock(&mec_io_mutex);
> +
> + return (reg >> 16) / 10;
The hwmon ABI expects temperatures to be reported in milli-degrees C.
The above sets the maximum temperature to 65,535 / 10 = 6,553 milli-degrees or 6.553 degrees C. It is very unlikely that this is correct.
Again, I commented on this before.
Henry: this is due to an internal implementation of MIcor-controller firmware, instead of putting real temperature to the register, it put (real temperature * 10 ) to the register. So, in order to report correct temperature to user space application, the read value is divided by 10, then report to user space.
Please let me know if you accept this. If not, I can change the code, but let user space application to do adjustment.
> +}
> +
> +static umode_t silicom_fan_control_fan_is_visible(const u32 attr) {
> + switch (attr) {
> + case hwmon_fan_input:
> + case hwmon_fan_label:
> + return 0444;
> + default:
> + return 0;
> + }
> +}
> +
> +static umode_t silicom_fan_control_temp_is_visible(const u32 attr) {
> + switch (attr) {
> + case hwmon_temp_input:
> + case hwmon_temp_label:
> + return 0444;
> + default:
> + return 0;
> + }
> +}
> +
> +static int silicom_fan_control_read_fan(struct device *dev, u32 attr,
> +long *val) {
> + struct silicom_fan_control_data *ctl = dev_get_drvdata(dev);
> +
> + switch (attr) {
> + case hwmon_fan_input:
> + ctl->fan_speed = rpm_get();
> + *val = ctl->fan_speed;
Storing data in fan_speed is unnecessary.
Henry: OK, it will be removed.
> + return 0;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int silicom_fan_control_read_temp(struct device *dev, u32
> +attr, long *val) {
> + switch (attr) {
> + case hwmon_temp_input:
> + *val = temp_get();
> + return 0;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static umode_t silicom_fan_control_is_visible(const void *data,
> + enum hwmon_sensor_types type,
> + u32 attr, int channel) {
> + switch (type) {
> + case hwmon_fan:
> + return silicom_fan_control_fan_is_visible(attr);
> + case hwmon_temp:
> + return silicom_fan_control_temp_is_visible(attr);
> + default:
> + return 0;
> + }
> +}
> +
> +static int silicom_fan_control_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *val) {
> + switch (type) {
> + case hwmon_fan:
> + return silicom_fan_control_read_fan(dev, attr, val);
> + case hwmon_temp:
> + return silicom_fan_control_read_temp(dev, attr, val);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int silicom_fan_control_read_labels(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, const
> +char **str) {
> + switch (type) {
> + case hwmon_fan:
> + *str = "Fan Speed";
> + return 0;
> + case hwmon_temp:
> + *str = "Thermostat Sensor";
> + return 0;
Those labels have no practical value.
Henry: Those labels will be used by user space code to identify Silicom_platform driver.
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static const struct hwmon_ops silicom_fan_control_hwmon_ops = {
> + .is_visible = silicom_fan_control_is_visible,
> + .read = silicom_fan_control_read,
> + .write = NULL,
Unnecessary.
Henry: OK, will be removed silicom_fan_control_is_visible.
> + .read_string = silicom_fan_control_read_labels, };
> +
> +static const struct hwmon_chip_info silicom_chip_info = {
> + .ops = &silicom_fan_control_hwmon_ops,
> + .info = silicom_fan_control_info, };
> +
> +static int __init silicom_platform_probe(struct platform_device
> +*device) {
> + int i, err;
> + u8 magic, ver;
> + struct silicom_fan_control_data *ctl;
> + const char *name = "Silocom_Fan_Monitor";
> + const char *dev_name = "Silicom_platform";
> +
> + mec_io_base = 0x0800;
> + mec_io_len = 8;
> + if (!devm_request_region(&device->dev, mec_io_base, mec_io_len, "mec")) {
> + dev_err(&device->dev, "couldn't reserve MEC io ports\n");
> + return -EBUSY;
> + }
> +
> + /* Sanity check magic number read for EC */
> + outb(0x00, MEC_ADDR);
> + magic = inb(MEC_DATA(DEFAULT_CHAN_LO));
> + ver = inb(MEC_DATA(DEFAULT_CHAN_HI));
> + dev_dbg(&device->dev, "EC magic 0x%02x, version 0x%02x\n",
> + magic, ver);
> +
> + if (magic != SILICOM_MEC_MAGIC) {
> + dev_err(&device->dev, "Bad EC magic 0x%02x!\n", magic);
> + return -ENODEV;
> + }
> +
> + err = silicom_mc_leds_register(&device->dev, silicom_led_info);
> + if (err) {
> + dev_err(&device->dev, "Failed to register LEDs\n");
> + return err;
> + }
> +
> + err = devm_gpiochip_add_data(&device->dev, silicom_gpiochip, silicom_gpio_channels);
> + if (err) {
> + dev_err(&device->dev, "Failed to register gpiochip: %d\n", err);
> + return err;
> + }
> +
> + ctl = devm_kzalloc(&device->dev, sizeof(*ctl), GFP_KERNEL);
> + if (!ctl)
> + return -ENOMEM;
> +
> + ctl->hdev = devm_hwmon_device_register_with_info(&device->dev, name, ctl,
> + &silicom_chip_info, NULL);
> +
> + my_dev = root_device_register(dev_name);
> + for (i = 0; i < ARRAY_SIZE(my_dev_attr); i++) {
> + err = sysfs_create_file(&my_dev->kobj, &my_dev_attr[i].attr);
> + if (err) {
> + pr_debug("failed to create the foo file in /sys/devices/Silicom_platform\n");
> + break;
> + }
> + }
> +
> + return err;
> +}
> +
> +static int __init silicom_platform_info_init(const struct
> +dmi_system_id *id) {
> + struct silicom_platform_info *info = id->driver_data;
> +
> + dev_info(&silicom_platform_dev->dev, "Detected %s\n",
> + id->ident);
> +
> + mec_io_base = info->io_base;
> + mec_io_len = info->io_len;
> + silicom_led_info = info->led_info;
> + silicom_gpio_channels = info->gpio_channels;
> + silicom_gpiochip = info->gpiochip;
> + if (silicom_gpiochip)
> + silicom_gpiochip->ngpio = info->ngpio;
> +
> + return 1;
> +}
> +
> +static const struct dmi_system_id silicom_dmi_ids[] __initconst = {
> + {
> + .callback = silicom_platform_info_init,
> + .ident = "Silicom Cordoba (Generic)",
> + .matches = {
> + DMI_MATCH(DMI_BOARD_VENDOR, "Silicom"),
> + DMI_MATCH(DMI_BOARD_NAME, "80300-0214-G"),
> + },
> + .driver_data = &silicom_generic_cordoba_info,
> + },
> + {
> + .callback = silicom_platform_info_init,
> + .ident = "Silicom Cordoba (Generic)",
> + .matches = {
> + DMI_MATCH(DMI_BOARD_VENDOR, "Silicom"),
> + DMI_MATCH(DMI_BOARD_NAME, "80500-0214-G"),
> + },
> + .driver_data = &silicom_generic_cordoba_info,
> + },
> + {
> + .callback = silicom_platform_info_init,
> + .ident = "Silicom Cordoba (plat_0222)",
> + .matches = {
> + DMI_MATCH(DMI_BOARD_VENDOR, "Silicom"),
> + DMI_MATCH(DMI_BOARD_NAME, "80300-0222-G"),
> + },
> + .driver_data = &silicom_plat_0222_cordoba_info,
> + },
> + { },
> +};
> +
> +static int __init silicom_platform_init(void) {
> + struct device *dev;
> + int err;
> +
> + /* register a platform device to act as the parent for LEDS, etc. */
> + silicom_platform_dev = platform_device_register_simple("silicom-platform", -1, NULL, 0);
> + if (IS_ERR(silicom_platform_dev)) {
> + err = PTR_ERR(silicom_platform_dev);
> + pr_err("failed to register silicom-platform device: %d\n", err);
> + goto silicom_init_register_err;
> + }
> + dev = &silicom_platform_dev->dev;
> +
> + err = dmi_check_system(silicom_dmi_ids);
> + if (err == 0) {
> + dev_err(dev, "No DMI match for this platform\n");
> + err = -ENODEV;
> + goto silicom_init_probe_err;
> + }
> +
> + /* Directly probe the platform driver in init since this isn't a
> + * hotpluggable device. That means we don't need to register a driver
> + * that needs to wait around in memory on the chance a matching device
> + * would get added. Instead run once in __init so that we can free all
> + * those resources when the __init region is wiped
> + */
> + err = platform_driver_probe(&silicom_platform_driver, silicom_platform_probe);
> + if (err) {
> + dev_err(dev, "Failed to probe platform driver %d\n", err);
> + goto silicom_init_probe_err;
> + }
> +
> + return 0;
> +
> +silicom_init_probe_err:
> + if (silicom_platform_dev) {
> + platform_device_unregister(silicom_platform_dev);
> + silicom_platform_dev = NULL;
> + }
> + if (my_dev) {
> + root_device_unregister(my_dev);
> + my_dev = NULL;
> + }
> +
> +silicom_init_register_err:
> + return err;
> +}
> +
> +static void __exit silicom_platform_exit(void) {
> + int i;
> +
> + if (silicom_platform_dev) {
> + platform_device_unregister(silicom_platform_dev);
> + platform_driver_unregister(&silicom_platform_driver);
> + }
> +
> + if (my_dev) {
> + for (i = 0; i < ARRAY_SIZE(my_dev_attr); i++)
> + sysfs_remove_file(&my_dev->kobj, &my_dev_attr[i].attr);
> + root_device_unregister(my_dev);
> + }
> + mutex_destroy(&mec_io_mutex);
> +}
> +
> +module_init(silicom_platform_init);
> +module_exit(silicom_platform_exit);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Henry Shi <henrys@xxxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Platform driver for Silicom network appliances");
> +
> +MODULE_DEVICE_TABLE(dmi, silicom_dmi_ids);