Hi Daniel,

Thanks for taking the time to review this patch.  The answer to most of 
your comments are that we develop and are developing a whole family of 
backlight controllers and we use this driver a lot for testing.  We need 
the ability to reload this module without resetting the hardware for 
development of the module itself as well as the hardware.  We use 
user-space interfaces for testing and copied that ability directly from 
existing backlight drivers already in the kernel which are really the 
only standard we have to go by.  We have already removed a large amount 
of the debugging code from our module but it has become difficult to 
maintain two independent versions of the driver: 1 for dev and 1 for 
mainline. I'd really appreciate your advise on how others handle this 
issue which must be generic.

Thanks!


Brian


On 02/08/2017 08:36 AM, Daniel Thompson wrote:

On 30/01/17 23:01, Olimpiu Dejeu wrote:

quoted

diff --git a/drivers/video/backlight/arcxcnn_bl.c 

b/drivers/video/backlight/arcxcnn_bl.c
new file mode 100644
index 0000000..284df08

--- /dev/null
+++ b/drivers/video/backlight/arcxcnn_bl.c

@@ -0,0 +1,451 @@
+/*
+ * Backlight driver for ArcticSand ARC_X_C_0N_0N Devices
+ *
+ * Copyright 2016 ArcticSand, Inc.
+ * Author : Brian Dodge <bdodge@arcticsand.com>
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License 
along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+
+#include "linux/i2c/arcxcnn.h"
+
+#define ARCXCNN_CMD        0x00    /* Command Register */
+#define ARCXCNN_CMD_STDBY    0x80    /*   I2C Standby */
+#define ARCXCNN_CMD_RESET    0x40    /*   Reset */
+#define ARCXCNN_CMD_BOOST    0x10    /*   Boost */
+#define ARCXCNN_CMD_OVP_MASK    0x0C    /*   --- Over Voltage 
Threshold */
+#define ARCXCNN_CMD_OVP_XXV    0x0C    /*   <rsvrd> Over Voltage 
Threshold */
+#define ARCXCNN_CMD_OVP_20V    0x08    /*   20v Over Voltage 
Threshold */
+#define ARCXCNN_CMD_OVP_24V    0x04    /*   24v Over Voltage 
Threshold */
+#define ARCXCNN_CMD_OVP_31V    0x00    /*   31.4v Over Voltage 
Threshold */
+#define ARCXCNN_CMD_EXT_COMP    0x01    /*   part (0) or full (1) 
ext. comp */
+
+#define ARCXCNN_CONFIG        0x01    /* Configuration */
+#define ARCXCNN_STATUS1        0x02    /* Status 1 */
+#define ARCXCNN_STATUS2        0x03    /* Status 2 */
+#define ARCXCNN_FADECTRL    0x04    /* Fading Control */
+#define ARCXCNN_ILED_CONFIG    0x05    /* ILED Configuration */
+#define ARCXCNN_ILED_DIM_PWM    0x00    /*   config dim mode pwm */
+#define ARCXCNN_ILED_DIM_INT    0x04    /*   config dim mode 
internal */
+#define ARCXCNN_LEDEN        0x06    /* LED Enable Register */
+#define ARCXCNN_LEDEN_ISETEXT    0x80    /*   Full-scale current set 
extern */
+#define ARCXCNN_LEDEN_MASK    0x3F    /*   LED string enables mask */
+#define ARCXCNN_LEDEN_BITS    0x06    /*   Bits of LED string 
enables */
+#define ARCXCNN_LEDEN_LED1    0x01
+#define ARCXCNN_LEDEN_LED2    0x02
+#define ARCXCNN_LEDEN_LED3    0x04
+#define ARCXCNN_LEDEN_LED4    0x08
+#define ARCXCNN_LEDEN_LED5    0x10
+#define ARCXCNN_LEDEN_LED6    0x20
+
+#define ARCXCNN_WLED_ISET_LSB    0x07    /* LED ISET LSB (in upper 
nibble) */
+#define ARCXCNN_WLED_ISET_LSB_SHIFT 0x04  /* ISET LSB Left Shift */
+#define ARCXCNN_WLED_ISET_MSB    0x08    /* LED ISET MSB (8 bits) */
+
+#define ARCXCNN_DIMFREQ        0x09
+#define ARCXCNN_COMP_CONFIG    0x0A
+#define ARCXCNN_FILT_CONFIG    0x0B
+#define ARCXCNN_IMAXTUNE    0x0C
+#define ARCXCNN_ID_MSB        0x1E
+#define ARCXCNN_ID_LSB        0x1F
+
+#define MAX_BRIGHTNESS        4095
+
+static int no_reset_on_remove;
+module_param_named(noreset, no_reset_on_remove, int, 0644);
+MODULE_PARM_DESC(noreset, "No reset on module removal");
+
+static int ibright = 60;
+module_param_named(ibright, ibright, int, 0644);

Use module_param() when names match.

quoted

+MODULE_PARM_DESC(ibright, "Initial brightness (when no plat data)");

When will there be no platform data. Hotpluggable I2C backlight 
controllers aren't very common.

Also, if this *is* needed, shouldn't the permissions should be 0444?

quoted

+
+static int ileden = ARCXCNN_LEDEN_MASK;
+module_param_named(ileden, ileden, int, 0644);
+MODULE_PARM_DESC(ileden, "Initial LED String Enables (when no plat 
data)");

Both, as above.

quoted

+
+struct arcxcnn {
+    char chipname[64];

This is more than double the size required. Actually if the chipid is 
useful to userspace it should be stored numerically.

quoted

+    struct i2c_client *client;
+    struct backlight_device *bl;
+    struct device *dev;
+    struct arcxcnn_platform_data *pdata;
+};
+
+static int arcxcnn_update_bit(struct arcxcnn *lp, u8 reg, u8 mask, 
u8 data)

s/_bit/_field/

quoted

+{
+    int ret;
+    u8 tmp;
+
+    ret = i2c_smbus_read_byte_data(lp->client, reg);
+    if (ret < 0) {
+        dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
+        return ret;
+    }
+
+    tmp = (u8)ret;
+    tmp &= ~mask;
+    tmp |= data & mask;
+
+    return i2c_smbus_write_byte_data(lp->client, reg, tmp);
+}
+
+static int arcxcnn_set_brightness(struct arcxcnn *lp, u32 brightness)
+{
+    int ret;
+    u8 val;
+
+    /* lower nibble of brightness goes in upper nibble of LSB 
register */
+    val = (brightness & 0xF) << ARCXCNN_WLED_ISET_LSB_SHIFT;
+    ret = i2c_smbus_write_byte_data(lp->client, 
ARCXCNN_WLED_ISET_LSB, val);
+    if (ret < 0)
+        return ret;
+
+    /* remaining 8 bits of brightness go in MSB register */
+    val = (brightness >> 4);
+    ret = i2c_smbus_write_byte_data(lp->client, 
ARCXCNN_WLED_ISET_MSB, val);
+
+    return ret;

This can be a direct return from _write_byte_data.

quoted

+}
+
+static int arcxcnn_bl_update_status(struct backlight_device *bl)
+{
+    struct arcxcnn *lp = bl_get_data(bl);
+    u32 brightness = bl->props.brightness;
+
+    if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
+        brightness = 0;
+
+    arcxcnn_set_brightness(lp, brightness);

Return code is ignored here...

quoted

+
+    /* set power-on/off/save modes */
+    arcxcnn_update_bit(lp, ARCXCNN_CMD, ARCXCNN_CMD_STDBY,
+        (bl->props.power == 0) ? 0 : ARCXCNN_CMD_STDBY);

... and here.

quoted

+    return 0;
+}
+
+static const struct backlight_ops arcxcnn_bl_ops = {
+    .options = BL_CORE_SUSPENDRESUME,
+    .update_status = arcxcnn_bl_update_status,
+};
+
+static int arcxcnn_backlight_register(struct arcxcnn *lp)
+{
+    struct backlight_properties *props;
+    const char *name = lp->pdata->name ? : "arctic_bl";
+
+    props = devm_kzalloc(lp->dev, sizeof(*props), GFP_KERNEL);
+    if (!props)
+        return -ENOMEM;
+
+    props->type = BACKLIGHT_PLATFORM;
+    props->max_brightness = MAX_BRIGHTNESS;
+
+    if (lp->pdata->initial_brightness > props->max_brightness)
+        lp->pdata->initial_brightness = props->max_brightness;
+
+    props->brightness = lp->pdata->initial_brightness;
+
+    lp->bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,
+                       &arcxcnn_bl_ops, props);
+    if (IS_ERR(lp->bl))
+        return PTR_ERR(lp->bl);
+
+    return 0;
+}
+
+static ssize_t arcxcnn_chip_id_show(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+    struct arcxcnn *lp = dev_get_drvdata(dev);
+
+    return scnprintf(buf, PAGE_SIZE, "%s\n", lp->chipname);
+}
+
+static ssize_t arcxcnn_leden_show(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+    struct arcxcnn *lp = dev_get_drvdata(dev);
+
+    return scnprintf(buf, PAGE_SIZE, "%02X\n", lp->pdata->leden);
+}
+
+static ssize_t arcxcnn_leden_store(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t len)

Under what circumstances can the led-sources change at runtime and 
motivate this kind of interface?

quoted

+{
+    struct arcxcnn *lp = dev_get_drvdata(dev);
+    unsigned long leden;
+
+    if (kstrtoul(buf, 0, &leden))
+        return 0;
+
+    if (leden != lp->pdata->leden) {
+        /* don't allow 0 for leden, use power to turn all off */
+        if (leden == 0)
+            return -EINVAL;
+        lp->pdata->leden = leden & ARCXCNN_LEDEN_MASK;
+        arcxcnn_update_bit(lp, ARCXCNN_LEDEN,
+            ARCXCNN_LEDEN_MASK, lp->pdata->leden);

Should be a return (to pass the error code back).

quoted

+    }
+
+    return len;
+}
+
+static DEVICE_ATTR(chip_id, 0444, arcxcnn_chip_id_show, NULL);
+static DEVICE_ATTR(leden, 0664, arcxcnn_leden_show, 
arcxcnn_leden_store);
+
+static struct attribute *arcxcnn_attributes[] = {
+    &dev_attr_chip_id.attr,
+    &dev_attr_leden.attr,
+    NULL,
+};
+
+static const struct attribute_group arcxcnn_attr_group = {
+    .attrs = arcxcnn_attributes,
+};
+
+static void arcxcnn_parse_dt(struct arcxcnn *lp)
+{
+    struct device *dev = lp->dev;
+    struct device_node *node = dev->of_node;
+    u32 prog_val, num_entry, entry, sources[ARCXCNN_LEDEN_BITS];
+    int ret;
+
+    /* device tree entry isn't required, defaults are OK */
+    if (!node)
+        return;
+
+    ret = of_property_read_string(node, "label", &lp->pdata->name);
+    if (ret < 0)
+        lp->pdata->name = NULL;
+
+    ret = of_property_read_u32(node, "default-brightness", &prog_val);
+    if (ret == 0)
+        lp->pdata->initial_brightness = prog_val;
+
+    ret = of_property_read_u32(node, "arc,led-config-0", &prog_val);
+    if (ret == 0)
+        lp->pdata->led_config_0 = (u8)prog_val;
+
+    ret = of_property_read_u32(node, "arc,led-config-1", &prog_val);
+    if (ret == 0)
+        lp->pdata->led_config_1 = (u8)prog_val;
+
+    ret = of_property_read_u32(node, "arc,dim-freq", &prog_val);
+    if (ret == 0)
+        lp->pdata->dim_freq = (u8)prog_val;
+
+    ret = of_property_read_u32(node, "arc,comp-config", &prog_val);
+    if (ret == 0)
+        lp->pdata->comp_config = (u8)prog_val;
+
+    ret = of_property_read_u32(node, "arc,filter-config", &prog_val);
+    if (ret == 0)
+        lp->pdata->filter_config = (u8)prog_val;
+
+    ret = of_property_read_u32(node, "arc,trim-config", &prog_val);
+    if (ret == 0)
+        lp->pdata->trim_config = (u8)prog_val;
+
+    ret = of_property_count_u32_elems(node, "led-sources");
+    if (ret < 0) {
+        lp->pdata->leden = ARCXCNN_LEDEN_MASK; /* all on is default */
+    } else {
+        num_entry = ret;
+        if (num_entry > ARCXCNN_LEDEN_BITS)
+            num_entry = ARCXCNN_LEDEN_BITS;
+
+        ret = of_property_read_u32_array(node, "led-sources", sources,
+                    num_entry);
+        if (ret < 0) {
+            dev_err(dev, "led-sources node is invalid.\n");
+            return;
+        }
+
+        lp->pdata->leden = 0;
+
+        /* for each enable in source, set bit in led enable */
+        for (entry = 0; entry < num_entry; entry++) {
+            u8 onbit = 1 << sources[entry];
+            lp->pdata->leden |= onbit;
+        }
+    }
+}
+
+static int arcxcnn_probe(struct i2c_client *cl, const struct 
i2c_device_id *id)
+{
+    struct arcxcnn *lp;
+    int ret;
+    u8 regval;
+    u16 chipid;
+
+    if (!i2c_check_functionality(cl->adapter, 
I2C_FUNC_SMBUS_BYTE_DATA))
+        return -EIO;
+
+    lp = devm_kzalloc(&cl->dev, sizeof(*lp), GFP_KERNEL);
+    if (!lp)
+        return -ENOMEM;
+
+    lp->client = cl;
+    lp->dev = &cl->dev;
+    lp->pdata = dev_get_platdata(&cl->dev);
+
+    /* reset the device */
+    i2c_smbus_write_byte_data(lp->client,
+        ARCXCNN_CMD, ARCXCNN_CMD_RESET);
+
+    /* read device ID */
+    regval = i2c_smbus_read_byte_data(lp->client, ARCXCNN_ID_MSB);
+    chipid = regval;
+    chipid <<= 8;
+
+    regval = i2c_smbus_read_byte_data(lp->client, ARCXCNN_ID_LSB);
+    chipid |= regval;
+
+    snprintf(lp->chipname, sizeof(lp->chipname),
+        "%s-%04X", id->name, chipid);

I'm curious what the chip id is and why the id is a userspace concern 
rather than something the *driver* uses to confirm the probe is correct.

quoted

+
+    if (!lp->pdata) {
+        lp->pdata = devm_kzalloc(lp->dev,
+                sizeof(*lp->pdata), GFP_KERNEL);
+        if (!lp->pdata)
+            return -ENOMEM;
+
+        /* Setup defaults based on power-on defaults */
+        lp->pdata->name = NULL;
+        lp->pdata->initial_brightness = ibright;
+        lp->pdata->leden = ileden;
+
+        lp->pdata->led_config_0 = i2c_smbus_read_byte_data(
+            lp->client, ARCXCNN_FADECTRL);
+
+        lp->pdata->led_config_1 = i2c_smbus_read_byte_data(
+            lp->client, ARCXCNN_ILED_CONFIG);
+        /* insure dim mode is not default pwm */
+        lp->pdata->led_config_1 |= ARCXCNN_ILED_DIM_INT;
+
+        lp->pdata->dim_freq = i2c_smbus_read_byte_data(
+            lp->client, ARCXCNN_DIMFREQ);
+
+        lp->pdata->comp_config = i2c_smbus_read_byte_data(
+            lp->client, ARCXCNN_COMP_CONFIG);
+
+        lp->pdata->filter_config = i2c_smbus_read_byte_data(
+            lp->client, ARCXCNN_FILT_CONFIG);
+
+        lp->pdata->trim_config = i2c_smbus_read_byte_data(
+            lp->client, ARCXCNN_IMAXTUNE);
+
+        if (IS_ENABLED(CONFIG_OF))
+            arcxcnn_parse_dt(lp);
+    }
+
+    i2c_set_clientdata(cl, lp);
+
+    /* constrain settings to what is possible */
+    if (lp->pdata->initial_brightness > MAX_BRIGHTNESS)
+        lp->pdata->initial_brightness = MAX_BRIGHTNESS;
+
+    /* set initial brightness */
+    arcxcnn_set_brightness(lp, lp->pdata->initial_brightness);
+
+    /* set other register values directly */
+    i2c_smbus_write_byte_data(lp->client, ARCXCNN_FADECTRL,
+        lp->pdata->led_config_0);
+    i2c_smbus_write_byte_data(lp->client, ARCXCNN_ILED_CONFIG,
+        lp->pdata->led_config_1);
+    i2c_smbus_write_byte_data(lp->client, ARCXCNN_DIMFREQ,
+        lp->pdata->dim_freq);
+    i2c_smbus_write_byte_data(lp->client, ARCXCNN_COMP_CONFIG,
+        lp->pdata->comp_config);
+    i2c_smbus_write_byte_data(lp->client, ARCXCNN_FILT_CONFIG,
+        lp->pdata->filter_config);
+    i2c_smbus_write_byte_data(lp->client, ARCXCNN_IMAXTUNE,
+        lp->pdata->trim_config);
+
+    /* set initial LED Enables */
+    arcxcnn_update_bit(lp, ARCXCNN_LEDEN,
+        ARCXCNN_LEDEN_MASK, lp->pdata->leden);

Pretty much *all* of the above functions return error codes.

quoted

+    ret = arcxcnn_backlight_register(lp);
+    if (ret) {
+        dev_err(lp->dev,
+            "failed to register backlight. err: %d\n", ret);
+        return ret;
+    }
+
+    ret = sysfs_create_group(&lp->dev->kobj, &arcxcnn_attr_group);
+    if (ret) {
+        dev_err(lp->dev, "failed to register sysfs. err: %d\n", ret);
+        return ret;
+    }
+
+    backlight_update_status(lp->bl);
+
+    return 0;
+}
+
+static int arcxcnn_remove(struct i2c_client *cl)
+{
+    struct arcxcnn *lp = i2c_get_clientdata(cl);
+
+    if (!no_reset_on_remove) {
+        /* disable all strings */
+        i2c_smbus_write_byte_data(lp->client,
+            ARCXCNN_LEDEN, 0x00);
+        /* reset the device */
+        i2c_smbus_write_byte_data(lp->client,
+            ARCXCNN_CMD, ARCXCNN_CMD_RESET);
+    }

Why would userspace want to suppress this reset?

quoted

+    lp->bl->props.brightness = 0;
+
+    backlight_update_status(lp->bl);
+
+    sysfs_remove_group(&lp->dev->kobj, &arcxcnn_attr_group);
+
+    return 0;
+}
+
+static const struct of_device_id arcxcnn_dt_ids[] = {
+    { .compatible = "arc,arc2c0608" },
+    { }
+};
+MODULE_DEVICE_TABLE(of, arcxcnn_dt_ids);
+
+static const struct i2c_device_id arcxcnn_ids[] = {
+    {"arc2c0608", ARC2C0608},
+    { }
+};
+MODULE_DEVICE_TABLE(i2c, arcxcnn_ids);
+
+static struct i2c_driver arcxcnn_driver = {
+    .driver = {
+        .name = "arcxcnn_bl",
+        .of_match_table = of_match_ptr(arcxcnn_dt_ids),
+    },
+    .probe = arcxcnn_probe,
+    .remove = arcxcnn_remove,
+    .id_table = arcxcnn_ids,
+};
+module_i2c_driver(arcxcnn_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Brian Dodge [off-list ref]");
+MODULE_DESCRIPTION("ARCXCNN Backlight driver");

diff --git a/include/linux/i2c/arcxcnn.h b/include/linux/i2c/arcxcnn.h
new file mode 100644
index 0000000..e378d63
--- /dev/null
+++ b/include/linux/i2c/arcxcnn.h

There's a general trend to move unused header files out of this 
directory and fold things back into the C code.

Are you expecting to add anything to the kernel (other than the 
driver) that actually includes this header, if not we probably don't 
need it.


Daniel.