Input: axp20x-pek - use driver_data of platform_device_id instead of extended attributes

To prepare an upcoming patch adding support for another PMIC that has
different startup and shutdown time, use driver_data of
platform_device_id instead of a fixed extended device attribute.

By doing so, we also remove a lot of nested structures that aren't
useful.

With this patch, a new PMIC can be easily supported by just filling
correctly its ax20x_info structure and adding a platform_device_id.

Moreover, since we get rid of extended attributes, rename
axp20x_store_ext_attr to axp20x_store_attr and axp20x_show_ext_attr to
axp20x_show_attr.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/drivers/input/misc/axp20x-pek.c b/drivers/input/misc/axp20x-pek.c
index cfeb0e9..95f33f7 100644 (file)
--- a/drivers/input/misc/axp20x-pek.c
+++ b/drivers/input/misc/axp20x-pek.c
@@ -29,9 +29,17 @@
 #define AXP20X_PEK_STARTUP_MASK                (0xc0)
 #define AXP20X_PEK_SHUTDOWN_MASK       (0x03)
 
+struct axp20x_info {
+       const struct axp20x_time *startup_time;
+       unsigned int startup_mask;
+       const struct axp20x_time *shutdown_time;
+       unsigned int shutdown_mask;
+};
+
 struct axp20x_pek {
        struct axp20x_dev *axp20x;
        struct input_dev *input;
+       struct axp20x_info *info;
        int irq_dbr;
        int irq_dbf;
 };
@@ -55,31 +63,18 @@ static const struct axp20x_time shutdown_time[] = {
        { .time = 10000, .idx = 3 },
 };
 
-struct axp20x_pek_ext_attr {
-       const struct axp20x_time *p_time;
-       unsigned int mask;
-};
-
-static struct axp20x_pek_ext_attr axp20x_pek_startup_ext_attr = {
-       .p_time = startup_time,
-       .mask   = AXP20X_PEK_STARTUP_MASK,
-};
-
-static struct axp20x_pek_ext_attr axp20x_pek_shutdown_ext_attr = {
-       .p_time = shutdown_time,
-       .mask   = AXP20X_PEK_SHUTDOWN_MASK,
+static const struct axp20x_info axp20x_info = {
+       .startup_time = startup_time,
+       .startup_mask = AXP20X_PEK_STARTUP_MASK,
+       .shutdown_time = shutdown_time,
+       .shutdown_mask = AXP20X_PEK_SHUTDOWN_MASK,
 };
 
-static struct axp20x_pek_ext_attr *get_axp_ext_attr(struct device_attribute *attr)
-{
-       return container_of(attr, struct dev_ext_attribute, attr)->var;
-}
-
-static ssize_t axp20x_show_ext_attr(struct device *dev,
-                                   struct device_attribute *attr, char *buf)
+static ssize_t axp20x_show_attr(struct device *dev,
+                               const struct axp20x_time *time,
+                               unsigned int mask, char *buf)
 {
        struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
-       struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
        unsigned int val;
        int ret, i;
 
@@ -87,22 +82,42 @@ static ssize_t axp20x_show_ext_attr(struct device *dev,
        if (ret != 0)
                return ret;
 
-       val &= axp20x_ea->mask;
-       val >>= ffs(axp20x_ea->mask) - 1;
+       val &= mask;
+       val >>= ffs(mask) - 1;
 
        for (i = 0; i < 4; i++)
-               if (val == axp20x_ea->p_time[i].idx)
-                       val = axp20x_ea->p_time[i].time;
+               if (val == time[i].idx)
+                       val = time[i].time;
 
        return sprintf(buf, "%u\n", val);
 }
 
-static ssize_t axp20x_store_ext_attr(struct device *dev,
-                                    struct device_attribute *attr,
-                                    const char *buf, size_t count)
+static ssize_t axp20x_show_attr_startup(struct device *dev,
+                                       struct device_attribute *attr,
+                                       char *buf)
+{
+       struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+       return axp20x_show_attr(dev, axp20x_pek->info->startup_time,
+                               axp20x_pek->info->startup_mask, buf);
+}
+
+static ssize_t axp20x_show_attr_shutdown(struct device *dev,
+                                        struct device_attribute *attr,
+                                        char *buf)
+{
+       struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+       return axp20x_show_attr(dev, axp20x_pek->info->shutdown_time,
+                               axp20x_pek->info->shutdown_mask, buf);
+}
+
+static ssize_t axp20x_store_attr(struct device *dev,
+                                const struct axp20x_time *time,
+                                unsigned int mask, const char *buf,
+                                size_t count)
 {
        struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
-       struct axp20x_pek_ext_attr *axp20x_ea = get_axp_ext_attr(attr);
        char val_str[20];
        size_t len;
        int ret, i;
@@ -123,39 +138,52 @@ static ssize_t axp20x_store_ext_attr(struct device *dev,
        for (i = 3; i >= 0; i--) {
                unsigned int err;
 
-               err = abs(axp20x_ea->p_time[i].time - val);
+               err = abs(time[i].time - val);
                if (err < best_err) {
                        best_err = err;
-                       idx = axp20x_ea->p_time[i].idx;
+                       idx = time[i].idx;
                }
 
                if (!err)
                        break;
        }
 
-       idx <<= ffs(axp20x_ea->mask) - 1;
-       ret = regmap_update_bits(axp20x_pek->axp20x->regmap,
-                                AXP20X_PEK_KEY,
-                                axp20x_ea->mask, idx);
+       idx <<= ffs(mask) - 1;
+       ret = regmap_update_bits(axp20x_pek->axp20x->regmap, AXP20X_PEK_KEY,
+                                mask, idx);
        if (ret != 0)
                return -EINVAL;
 
        return count;
 }
 
-static struct dev_ext_attribute axp20x_dev_attr_startup = {
-       .attr   = __ATTR(startup, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
-       .var    = &axp20x_pek_startup_ext_attr,
-};
+static ssize_t axp20x_store_attr_startup(struct device *dev,
+                                        struct device_attribute *attr,
+                                        const char *buf, size_t count)
+{
+       struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
 
-static struct dev_ext_attribute axp20x_dev_attr_shutdown = {
-       .attr   = __ATTR(shutdown, 0644, axp20x_show_ext_attr, axp20x_store_ext_attr),
-       .var    = &axp20x_pek_shutdown_ext_attr,
-};
+       return axp20x_store_attr(dev, axp20x_pek->info->startup_time,
+                                axp20x_pek->info->startup_mask, buf, count);
+}
+
+static ssize_t axp20x_store_attr_shutdown(struct device *dev,
+                                         struct device_attribute *attr,
+                                         const char *buf, size_t count)
+{
+       struct axp20x_pek *axp20x_pek = dev_get_drvdata(dev);
+
+       return axp20x_store_attr(dev, axp20x_pek->info->shutdown_time,
+                                axp20x_pek->info->shutdown_mask, buf, count);
+}
+
+DEVICE_ATTR(startup, 0644, axp20x_show_attr_startup, axp20x_store_attr_startup);
+DEVICE_ATTR(shutdown, 0644, axp20x_show_attr_shutdown,
+           axp20x_store_attr_shutdown);
 
 static struct attribute *axp20x_attributes[] = {
-       &axp20x_dev_attr_startup.attr.attr,
-       &axp20x_dev_attr_shutdown.attr.attr,
+       &dev_attr_startup.attr,
+       &dev_attr_shutdown.attr,
        NULL,
 };
 
@@ -291,8 +319,14 @@ static bool axp20x_pek_should_register_input(struct axp20x_pek *axp20x_pek,
 static int axp20x_pek_probe(struct platform_device *pdev)
 {
        struct axp20x_pek *axp20x_pek;
+       const struct platform_device_id *match = platform_get_device_id(pdev);
        int error;
 
+       if (!match) {
+               dev_err(&pdev->dev, "Failed to get platform_device_id\n");
+               return -EINVAL;
+       }
+
        axp20x_pek = devm_kzalloc(&pdev->dev, sizeof(struct axp20x_pek),
                                  GFP_KERNEL);
        if (!axp20x_pek)
@@ -306,6 +340,8 @@ static int axp20x_pek_probe(struct platform_device *pdev)
                        return error;
        }
 
+       axp20x_pek->info = (struct axp20x_info *)match->driver_data;
+
        error = devm_device_add_group(&pdev->dev, &axp20x_attribute_group);
        if (error) {
                dev_err(&pdev->dev, "Failed to create sysfs attributes: %d\n",
@@ -342,8 +378,17 @@ static const struct dev_pm_ops axp20x_pek_pm_ops = {
 #endif
 };
 
+static const struct platform_device_id axp_pek_id_match[] = {
+       {
+               .name = "axp20x-pek",
+               .driver_data = (kernel_ulong_t)&axp20x_info,
+       },
+       { /* sentinel */ }
+};
+
 static struct platform_driver axp20x_pek_driver = {
        .probe          = axp20x_pek_probe,
+       .id_table       = axp_pek_id_match,
        .driver         = {
                .name           = "axp20x-pek",
                .pm             = &axp20x_pek_pm_ops,