Lines Matching refs:lradc
9 * Allwinnner sunxi SoCs have a lradc which is specifically designed to have
63 /* struct lradc_variant - Describe sun4i-a10-lradc-keys hardware variant
64 * @divisor_numerator: The numerator of lradc Vref internally divisor
65 * @divisor_denominator: The denominator of lradc Vref internally divisor
111 struct sun4i_lradc_data *lradc = dev_id;
114 ints = readl(lradc->base + LRADC_INTS);
117 * lradc supports only one keypress at a time, release does not give
122 input_report_key(lradc->input, lradc->chan0_keycode, 0);
123 lradc->chan0_keycode = 0;
126 if ((ints & CHAN0_KEYDOWN_IRQ) && lradc->chan0_keycode == 0) {
127 val = readl(lradc->base + LRADC_DATA0) & 0x3f;
128 voltage = val * lradc->vref / 63;
130 for (i = 0; i < lradc->chan0_map_count; i++) {
131 diff = abs(lradc->chan0_map[i].voltage - voltage);
134 keycode = lradc->chan0_map[i].keycode;
138 lradc->chan0_keycode = keycode;
139 input_report_key(lradc->input, lradc->chan0_keycode, 1);
142 input_sync(lradc->input);
144 writel(ints, lradc->base + LRADC_INTS);
151 struct sun4i_lradc_data *lradc = input_get_drvdata(dev);
154 error = regulator_enable(lradc->vref_supply);
158 error = reset_control_deassert(lradc->reset);
162 error = clk_prepare_enable(lradc->clk);
166 lradc->vref = regulator_get_voltage(lradc->vref_supply) *
167 lradc->variant->divisor_numerator /
168 lradc->variant->divisor_denominator;
174 SAMPLE_RATE(0) | ENABLE(1), lradc->base + LRADC_CTRL);
176 writel(CHAN0_KEYUP_IRQ | CHAN0_KEYDOWN_IRQ, lradc->base + LRADC_INTC);
181 reset_control_assert(lradc->reset);
183 regulator_disable(lradc->vref_supply);
190 struct sun4i_lradc_data *lradc = input_get_drvdata(dev);
192 /* Disable lradc, leave other settings unchanged */
194 SAMPLE_RATE(2), lradc->base + LRADC_CTRL);
195 writel(0, lradc->base + LRADC_INTC);
197 clk_disable_unprepare(lradc->clk);
198 reset_control_assert(lradc->reset);
199 regulator_disable(lradc->vref_supply);
203 struct sun4i_lradc_data *lradc)
213 lradc->chan0_map_count = of_get_child_count(np);
214 if (lradc->chan0_map_count == 0) {
219 lradc->chan0_map = devm_kmalloc_array(dev, lradc->chan0_map_count,
222 if (!lradc->chan0_map)
227 struct sun4i_lradc_keymap *map = &lradc->chan0_map[i];
259 struct sun4i_lradc_data *lradc;
263 lradc = devm_kzalloc(dev, sizeof(struct sun4i_lradc_data), GFP_KERNEL);
264 if (!lradc)
267 error = sun4i_lradc_load_dt_keymap(dev, lradc);
271 lradc->variant = of_device_get_match_data(&pdev->dev);
272 if (!lradc->variant) {
273 dev_err(&pdev->dev, "Missing sun4i-a10-lradc-keys variant\n");
277 if (lradc->variant->has_clock_reset) {
278 lradc->clk = devm_clk_get(dev, NULL);
279 if (IS_ERR(lradc->clk))
280 return PTR_ERR(lradc->clk);
282 lradc->reset = devm_reset_control_get_exclusive(dev, NULL);
283 if (IS_ERR(lradc->reset))
284 return PTR_ERR(lradc->reset);
287 lradc->vref_supply = devm_regulator_get(dev, "vref");
288 if (IS_ERR(lradc->vref_supply))
289 return PTR_ERR(lradc->vref_supply);
291 lradc->dev = dev;
292 lradc->input = devm_input_allocate_device(dev);
293 if (!lradc->input)
296 lradc->input->name = pdev->name;
297 lradc->input->phys = "sun4i_lradc/input0";
298 lradc->input->open = sun4i_lradc_open;
299 lradc->input->close = sun4i_lradc_close;
300 lradc->input->id.bustype = BUS_HOST;
301 lradc->input->id.vendor = 0x0001;
302 lradc->input->id.product = 0x0001;
303 lradc->input->id.version = 0x0100;
305 __set_bit(EV_KEY, lradc->input->evbit);
306 for (i = 0; i < lradc->chan0_map_count; i++)
307 __set_bit(lradc->chan0_map[i].keycode, lradc->input->keybit);
309 input_set_drvdata(lradc->input, lradc);
311 lradc->base = devm_platform_ioremap_resource(pdev, 0);
312 if (IS_ERR(lradc->base))
313 return PTR_ERR(lradc->base);
320 "sun4i-a10-lradc-keys", lradc);
324 error = input_register_device(lradc->input);
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",