static void panel_destroy(struct tilcdc_module *mod)
{
struct panel_module *panel_mod = to_panel_module(mod);
if (panel_mod->timings)
display_timings_release(panel_mod->timings);
tilcdc_module_cleanup(mod);
kfree(panel_mod->info);
kfree(panel_mod);
}
static int panel_remove(struct platform_device *pdev)
{
struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
struct panel_module *panel_mod = to_panel_module(mod);
struct backlight_device *backlight = panel_mod->backlight;
if (backlight)
put_device(&backlight->dev);
display_timings_release(panel_mod->timings);
tilcdc_module_cleanup(mod);
kfree(panel_mod->info);
return 0;
}
/**
* of_get_display_timings - parse all display_timing entries from a device_node
* @np: device_node with the subnodes
**/
struct display_timings *of_get_display_timings(struct device_node *np)
{
struct device_node *timings_np;
struct device_node *entry;
struct device_node *native_mode;
struct display_timings *disp;
if (!np) {
pr_err("%s: no devicenode given\n", of_node_full_name(np));
return NULL;
}
timings_np = of_find_node_by_name(np, "display-timings");
if (!timings_np) {
pr_err("%s: could not find display-timings node\n",
of_node_full_name(np));
return NULL;
}
disp = kzalloc(sizeof(*disp), GFP_KERNEL);
if (!disp) {
pr_err("%s: could not allocate struct disp'\n",
of_node_full_name(np));
goto dispfail;
}
entry = of_parse_phandle(timings_np, "native-mode", 0);
/* assume first child as native mode if none provided */
if (!entry)
entry = of_get_next_child(np, NULL);
/* if there is no child, it is useless to go on */
if (!entry) {
pr_err("%s: no timing specifications given\n",
of_node_full_name(np));
goto entryfail;
}
pr_debug("%s: using %s as default timing\n",
of_node_full_name(np), entry->name);
native_mode = entry;
disp->num_timings = of_get_child_count(timings_np);
if (disp->num_timings == 0) {
/* should never happen, as entry was already found above */
pr_err("%s: no timings specified\n", of_node_full_name(np));
goto entryfail;
}
disp->timings = kzalloc(sizeof(struct display_timing *) *
disp->num_timings, GFP_KERNEL);
if (!disp->timings) {
pr_err("%s: could not allocate timings array\n",
of_node_full_name(np));
goto entryfail;
}
disp->num_timings = 0;
disp->native_mode = 0;
for_each_child_of_node(timings_np, entry) {
struct display_timing *dt;
dt = of_get_display_timing(entry);
if (!dt) {
/*
* to not encourage wrong devicetrees, fail in case of
* an error
*/
pr_err("%s: error in timing %d\n",
of_node_full_name(np), disp->num_timings + 1);
goto timingfail;
}
if (native_mode == entry)
disp->native_mode = disp->num_timings;
disp->timings[disp->num_timings] = dt;
disp->num_timings++;
}
of_node_put(timings_np);
/*
* native_mode points to the device_node returned by of_parse_phandle
* therefore call of_node_put on it
*/
of_node_put(native_mode);
pr_debug("%s: got %d timings. Using timing #%d as default\n",
of_node_full_name(np), disp->num_timings,
disp->native_mode + 1);
return disp;
timingfail:
if (native_mode)
of_node_put(native_mode);
display_timings_release(disp);
entryfail:
kfree(disp);
dispfail:
of_node_put(timings_np);
return NULL;
}
static int panel_probe(struct platform_device *pdev)
{
struct device_node *bl_node, *node = pdev->dev.of_node;
struct panel_module *panel_mod;
struct tilcdc_module *mod;
struct pinctrl *pinctrl;
int ret;
/* bail out early if no DT data: */
if (!node) {
dev_err(&pdev->dev, "device-tree data is missing\n");
return -ENXIO;
}
panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
if (!panel_mod)
return -ENOMEM;
bl_node = of_parse_phandle(node, "backlight", 0);
if (bl_node) {
panel_mod->backlight = of_find_backlight_by_node(bl_node);
of_node_put(bl_node);
if (!panel_mod->backlight)
return -EPROBE_DEFER;
dev_info(&pdev->dev, "found backlight\n");
}
panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
GPIOD_OUT_LOW);
if (IS_ERR(panel_mod->enable_gpio)) {
ret = PTR_ERR(panel_mod->enable_gpio);
dev_err(&pdev->dev, "failed to request enable GPIO\n");
goto fail_backlight;
}
if (panel_mod->enable_gpio)
dev_info(&pdev->dev, "found enable GPIO\n");
mod = &panel_mod->base;
pdev->dev.platform_data = mod;
tilcdc_module_init(mod, "panel", &panel_module_ops);
pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
if (IS_ERR(pinctrl))
dev_warn(&pdev->dev, "pins are not configured\n");
panel_mod->timings = of_get_display_timings(node);
if (!panel_mod->timings) {
dev_err(&pdev->dev, "could not get panel timings\n");
ret = -EINVAL;
goto fail_free;
}
panel_mod->info = of_get_panel_info(node);
if (!panel_mod->info) {
dev_err(&pdev->dev, "could not get panel info\n");
ret = -EINVAL;
goto fail_timings;
}
mod->preferred_bpp = panel_mod->info->bpp;
return 0;
fail_timings:
display_timings_release(panel_mod->timings);
fail_free:
tilcdc_module_cleanup(mod);
fail_backlight:
if (panel_mod->backlight)
put_device(&panel_mod->backlight->dev);
return ret;
}