1 // SPDX-License-Identifier: GPL-2.0-or-later
17 #include "line-display.h"
22  * struct img_ascii_lcd_config - Configuration information about an LCD model
23  * @num_chars: the number of characters the LCD can display
25  * @update: function called to update the LCD
34  * struct img_ascii_lcd_ctx - Private data structure
35  * @base: the base address of the LCD registers
36  * @regmap: the regmap through which LCD registers are accessed
37  * @offset: the offset within regmap to the start of the LCD registers
38  * @cfg: pointer to the LCD model configuration
40  * @curr: the string currently displayed on the LCD
54  * MIPS Boston development board
64 	val = *((u64 *)&ctx->curr[0]);  in boston_update()
65 	__raw_writeq(val, ctx->base);  in boston_update()
67 	val = *((u32 *)&ctx->curr[0]);  in boston_update()
68 	__raw_writel(val, ctx->base);  in boston_update()
69 	val = *((u32 *)&ctx->curr[4]);  in boston_update()
70 	__raw_writel(val, ctx->base + 4);  in boston_update()
92 	for (i = 0; i < linedisp->num_chars; i++) {  in malta_update()
93 		err = regmap_write(ctx->regmap,  in malta_update()
94 				   ctx->offset + (i * 8), ctx->curr[i]);  in malta_update()
100 		pr_err_ratelimited("Failed to update LCD display: %d\n", err);  in malta_update()
129 		err = regmap_read(ctx->regmap,  in sead3_wait_sm_idle()
130 				  ctx->offset + SEAD3_REG_CPLD_STATUS,  in sead3_wait_sm_idle()
150 		err = regmap_read(ctx->regmap,  in sead3_wait_lcd_idle()
151 				  ctx->offset + SEAD3_REG_LCD_CTRL,  in sead3_wait_lcd_idle()
160 		err = regmap_read(ctx->regmap,  in sead3_wait_lcd_idle()
161 				  ctx->offset + SEAD3_REG_CPLD_DATA,  in sead3_wait_lcd_idle()
177 	for (i = 0; i < linedisp->num_chars; i++) {  in sead3_update()
182 		err = regmap_write(ctx->regmap,  in sead3_update()
183 				   ctx->offset + SEAD3_REG_LCD_CTRL,  in sead3_update()
192 		err = regmap_write(ctx->regmap,  in sead3_update()
193 				   ctx->offset + SEAD3_REG_LCD_DATA,  in sead3_update()
194 				   ctx->curr[i]);  in sead3_update()
200 		pr_err_ratelimited("Failed to update LCD display: %d\n", err);  in sead3_update()
210 	{ .compatible = "img,boston-lcd", .data = &boston_config },
211 	{ .compatible = "mti,malta-lcd", .data = &malta_config },
212 	{ .compatible = "mti,sead3-lcd", .data = &sead3_config },
218  * img_ascii_lcd_probe() - probe an LCD display device
219  * @pdev: the LCD platform device
221  * Probe an LCD display device, ensuring that we have the required resources in
222  * order to access the LCD & setting up private data as well as sysfs files.
224  * Return: 0 on success, else -ERRNO
230 	struct device *dev = &pdev->dev;  in img_ascii_lcd_probe()
236 		return -ENODEV;  in img_ascii_lcd_probe()
238 	cfg = match->data;  in img_ascii_lcd_probe()
239 	ctx = devm_kzalloc(dev, sizeof(*ctx) + cfg->num_chars, GFP_KERNEL);  in img_ascii_lcd_probe()
241 		return -ENOMEM;  in img_ascii_lcd_probe()
243 	if (cfg->external_regmap) {  in img_ascii_lcd_probe()
244 		ctx->regmap = syscon_node_to_regmap(dev->parent->of_node);  in img_ascii_lcd_probe()
245 		if (IS_ERR(ctx->regmap))  in img_ascii_lcd_probe()
246 			return PTR_ERR(ctx->regmap);  in img_ascii_lcd_probe()
248 		if (of_property_read_u32(dev->of_node, "offset", &ctx->offset))  in img_ascii_lcd_probe()
249 			return -EINVAL;  in img_ascii_lcd_probe()
251 		ctx->base = devm_platform_ioremap_resource(pdev, 0);  in img_ascii_lcd_probe()
252 		if (IS_ERR(ctx->base))  in img_ascii_lcd_probe()
253 			return PTR_ERR(ctx->base);  in img_ascii_lcd_probe()
256 	err = linedisp_register(&ctx->linedisp, dev, cfg->num_chars, ctx->curr,  in img_ascii_lcd_probe()
257 				cfg->update);  in img_ascii_lcd_probe()
262 	err = compat_only_sysfs_link_entry_to_kobj(&dev->kobj,  in img_ascii_lcd_probe()
263 						   &ctx->linedisp.dev.kobj,  in img_ascii_lcd_probe()
272 	linedisp_unregister(&ctx->linedisp);  in img_ascii_lcd_probe()
277  * img_ascii_lcd_remove() - remove an LCD display device
278  * @pdev: the LCD platform device
280  * Remove an LCD display device, freeing private resources & ensuring that the
281  * driver stops using the LCD display registers.
289 	sysfs_remove_link(&pdev->dev.kobj, "message");  in img_ascii_lcd_remove()
290 	linedisp_unregister(&ctx->linedisp);  in img_ascii_lcd_remove()
296 		.name		= "img-ascii-lcd",
304 MODULE_DESCRIPTION("Imagination Technologies ASCII LCD Display");