1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Allwinner sun4i low res adc attached tablet keys driver
14  * there are no boards known to use channel 1.
63 /* struct lradc_variant - Describe sun4i-a10-lradc-keys hardware variant
114 	ints  = readl(lradc->base + LRADC_INTS);  in sun4i_lradc_irq()
122 		input_report_key(lradc->input, lradc->chan0_keycode, 0);  in sun4i_lradc_irq()
123 		lradc->chan0_keycode = 0;  in sun4i_lradc_irq()
126 	if ((ints & CHAN0_KEYDOWN_IRQ) && lradc->chan0_keycode == 0) {  in sun4i_lradc_irq()
127 		val = readl(lradc->base + LRADC_DATA0) & 0x3f;  in sun4i_lradc_irq()
128 		voltage = val * lradc->vref / 63;  in sun4i_lradc_irq()
130 		for (i = 0; i < lradc->chan0_map_count; i++) {  in sun4i_lradc_irq()
131 			diff = abs(lradc->chan0_map[i].voltage - voltage);  in sun4i_lradc_irq()
134 				keycode = lradc->chan0_map[i].keycode;  in sun4i_lradc_irq()
138 		lradc->chan0_keycode = keycode;  in sun4i_lradc_irq()
139 		input_report_key(lradc->input, lradc->chan0_keycode, 1);  in sun4i_lradc_irq()
142 	input_sync(lradc->input);  in sun4i_lradc_irq()
144 	writel(ints, lradc->base + LRADC_INTS);  in sun4i_lradc_irq()
154 	error = regulator_enable(lradc->vref_supply);  in sun4i_lradc_open()
158 	error = reset_control_deassert(lradc->reset);  in sun4i_lradc_open()
162 	error = clk_prepare_enable(lradc->clk);  in sun4i_lradc_open()
166 	lradc->vref = regulator_get_voltage(lradc->vref_supply) *  in sun4i_lradc_open()
167 		      lradc->variant->divisor_numerator /  in sun4i_lradc_open()
168 		      lradc->variant->divisor_denominator;  in sun4i_lradc_open()
174 		SAMPLE_RATE(0) | ENABLE(1), lradc->base + LRADC_CTRL);  in sun4i_lradc_open()
176 	writel(CHAN0_KEYUP_IRQ | CHAN0_KEYDOWN_IRQ, lradc->base + LRADC_INTC);  in sun4i_lradc_open()
181 	reset_control_assert(lradc->reset);  in sun4i_lradc_open()
183 	regulator_disable(lradc->vref_supply);  in sun4i_lradc_open()
194 		SAMPLE_RATE(2), lradc->base + LRADC_CTRL);  in sun4i_lradc_close()
195 	writel(0, lradc->base + LRADC_INTC);  in sun4i_lradc_close()
197 	clk_disable_unprepare(lradc->clk);  in sun4i_lradc_close()
198 	reset_control_assert(lradc->reset);  in sun4i_lradc_close()
199 	regulator_disable(lradc->vref_supply);  in sun4i_lradc_close()
209 	np = dev->of_node;  in sun4i_lradc_load_dt_keymap()
211 		return -EINVAL;  in sun4i_lradc_load_dt_keymap()
213 	lradc->chan0_map_count = of_get_child_count(np);  in sun4i_lradc_load_dt_keymap()
214 	if (lradc->chan0_map_count == 0) {  in sun4i_lradc_load_dt_keymap()
216 		return -EINVAL;  in sun4i_lradc_load_dt_keymap()
219 	lradc->chan0_map = devm_kmalloc_array(dev, lradc->chan0_map_count,  in sun4i_lradc_load_dt_keymap()
222 	if (!lradc->chan0_map)  in sun4i_lradc_load_dt_keymap()
223 		return -ENOMEM;  in sun4i_lradc_load_dt_keymap()
227 		struct sun4i_lradc_keymap *map = &lradc->chan0_map[i];  in sun4i_lradc_load_dt_keymap()
234 			return -EINVAL;  in sun4i_lradc_load_dt_keymap()
237 		error = of_property_read_u32(pp, "voltage", &map->voltage);  in sun4i_lradc_load_dt_keymap()
241 			return -EINVAL;  in sun4i_lradc_load_dt_keymap()
244 		error = of_property_read_u32(pp, "linux,code", &map->keycode);  in sun4i_lradc_load_dt_keymap()
248 			return -EINVAL;  in sun4i_lradc_load_dt_keymap()
260 	struct device *dev = &pdev->dev;  in sun4i_lradc_probe()
265 		return -ENOMEM;  in sun4i_lradc_probe()
271 	lradc->variant = of_device_get_match_data(&pdev->dev);  in sun4i_lradc_probe()
272 	if (!lradc->variant) {  in sun4i_lradc_probe()
273 		dev_err(&pdev->dev, "Missing sun4i-a10-lradc-keys variant\n");  in sun4i_lradc_probe()
274 		return -EINVAL;  in sun4i_lradc_probe()
277 	if (lradc->variant->has_clock_reset) {  in sun4i_lradc_probe()
278 		lradc->clk = devm_clk_get(dev, NULL);  in sun4i_lradc_probe()
279 		if (IS_ERR(lradc->clk))  in sun4i_lradc_probe()
280 			return PTR_ERR(lradc->clk);  in sun4i_lradc_probe()
282 		lradc->reset = devm_reset_control_get_exclusive(dev, NULL);  in sun4i_lradc_probe()
283 		if (IS_ERR(lradc->reset))  in sun4i_lradc_probe()
284 			return PTR_ERR(lradc->reset);  in sun4i_lradc_probe()
287 	lradc->vref_supply = devm_regulator_get(dev, "vref");  in sun4i_lradc_probe()
288 	if (IS_ERR(lradc->vref_supply))  in sun4i_lradc_probe()
289 		return PTR_ERR(lradc->vref_supply);  in sun4i_lradc_probe()
291 	lradc->dev = dev;  in sun4i_lradc_probe()
292 	lradc->input = devm_input_allocate_device(dev);  in sun4i_lradc_probe()
293 	if (!lradc->input)  in sun4i_lradc_probe()
294 		return -ENOMEM;  in sun4i_lradc_probe()
296 	lradc->input->name = pdev->name;  in sun4i_lradc_probe()
297 	lradc->input->phys = "sun4i_lradc/input0";  in sun4i_lradc_probe()
298 	lradc->input->open = sun4i_lradc_open;  in sun4i_lradc_probe()
299 	lradc->input->close = sun4i_lradc_close;  in sun4i_lradc_probe()
300 	lradc->input->id.bustype = BUS_HOST;  in sun4i_lradc_probe()
301 	lradc->input->id.vendor = 0x0001;  in sun4i_lradc_probe()
302 	lradc->input->id.product = 0x0001;  in sun4i_lradc_probe()
303 	lradc->input->id.version = 0x0100;  in sun4i_lradc_probe()
305 	__set_bit(EV_KEY, lradc->input->evbit);  in sun4i_lradc_probe()
306 	for (i = 0; i < lradc->chan0_map_count; i++)  in sun4i_lradc_probe()
307 		__set_bit(lradc->chan0_map[i].keycode, lradc->input->keybit);  in sun4i_lradc_probe()
309 	input_set_drvdata(lradc->input, lradc);  in sun4i_lradc_probe()
311 	lradc->base = devm_platform_ioremap_resource(pdev, 0);  in sun4i_lradc_probe()
312 	if (IS_ERR(lradc->base))  in sun4i_lradc_probe()
313 		return PTR_ERR(lradc->base);  in sun4i_lradc_probe()
320 				 "sun4i-a10-lradc-keys", lradc);  in sun4i_lradc_probe()
324 	error = input_register_device(lradc->input);  in sun4i_lradc_probe()
328 	if (device_property_read_bool(dev, "wakeup-source")) {  in sun4i_lradc_probe()
342 	{ .compatible = "allwinner,sun4i-a10-lradc-keys",
344 	{ .compatible = "allwinner,sun8i-a83t-r-lradc",
346 	{ .compatible = "allwinner,sun50i-r329-lradc",
354 		.name	= "sun4i-a10-lradc-keys",
362 MODULE_DESCRIPTION("Allwinner sun4i low res adc attached tablet keys driver");