drivers/mfd/ti_am335x_tscadc.c

29 void am335x_tsc_se_set_cache(struct ti_tscadc_dev *tscadc, u32 val)
33 	spin_lock_irqsave(&tscadc->reg_lock, flags);
34 	tscadc->reg_se_cache |= val;
35 	if (tscadc->adc_waiting)
36 		wake_up(&tscadc->reg_se_wait);
37 	else if (!tscadc->adc_in_use)
38 		regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
40 	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
44 static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tscadc)
49 	regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
51 		tscadc->adc_waiting = true;
52 		prepare_to_wait(&tscadc->reg_se_wait, &wait,
54 		spin_unlock_irq(&tscadc->reg_lock);
58 		spin_lock_irq(&tscadc->reg_lock);
59 		finish_wait(&tscadc->reg_se_wait, &wait);
65 		regmap_read(tscadc->regmap, REG_ADCFSM, &reg);
67 		tscadc->adc_waiting = false;
69 	tscadc->adc_in_use = true;
72 void am335x_tsc_se_set_once(struct ti_tscadc_dev *tscadc, u32 val)
74 	spin_lock_irq(&tscadc->reg_lock);
75 	am335x_tscadc_need_adc(tscadc);
77 	regmap_write(tscadc->regmap, REG_SE, val);
78 	spin_unlock_irq(&tscadc->reg_lock);
82 void am335x_tsc_se_adc_done(struct ti_tscadc_dev *tscadc)
86 	spin_lock_irqsave(&tscadc->reg_lock, flags);
87 	tscadc->adc_in_use = false;
88 	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
89 	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
93 void am335x_tsc_se_clr(struct ti_tscadc_dev *tscadc, u32 val)
97 	spin_lock_irqsave(&tscadc->reg_lock, flags);
98 	tscadc->reg_se_cache &= ~val;
99 	regmap_write(tscadc->regmap, REG_SE, tscadc->reg_se_cache);
100 	spin_unlock_irqrestore(&tscadc->reg_lock, flags);
104 static void tscadc_idle_config(struct ti_tscadc_dev *tscadc)
109 	if (ti_adc_with_touchscreen(tscadc))
112 	regmap_write(tscadc->regmap, REG_IDLECONFIG, idleconfig);
117 	struct ti_tscadc_dev *tscadc;
131 	tscadc = devm_kzalloc(&pdev->dev, sizeof(*tscadc), GFP_KERNEL);
132 	if (!tscadc)
135 	tscadc->dev = &pdev->dev;
142 	tscadc->data = of_device_get_match_data(&pdev->dev);
144 	if (ti_adc_with_touchscreen(tscadc)) {
202 		tscadc->irq = err;
204 	tscadc->tscadc_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
205 	if (IS_ERR(tscadc->tscadc_base))
206 		return PTR_ERR(tscadc->tscadc_base);
208 	tscadc->tscadc_phys_base = res->start;
209 	tscadc->regmap = devm_regmap_init_mmio(&pdev->dev,
210 					       tscadc->tscadc_base,
212 	if (IS_ERR(tscadc->regmap)) {
214 		return PTR_ERR(tscadc->regmap);
217 	spin_lock_init(&tscadc->reg_lock);
218 	init_waitqueue_head(&tscadc->reg_se_wait);
239 	tscadc->clk_div = (clk_get_rate(clk) / tscadc->data->target_clk_rate) - 1;
240 	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);
243 	 * Set the control register bits. tscadc->ctrl stores the configuration
247 	tscadc->ctrl = CNTRLREG_STEPID;
248 	if (ti_adc_with_touchscreen(tscadc)) {
249 		tscadc->ctrl |= CNTRLREG_TSC_STEPCONFIGWRT;
251 			tscadc->ctrl |= CNTRLREG_TSC_ENB;
253 				tscadc->ctrl |= CNTRLREG_TSC_5WIRE;
255 				tscadc->ctrl |= CNTRLREG_TSC_4WIRE;
258 		tscadc->ctrl |= CNTRLREG_MAG_PREAMP_PWRDOWN |
261 	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
263 	tscadc_idle_config(tscadc);
266 	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl | CNTRLREG_SSENB);
270 		cell = &tscadc->cells[cell_idx++];
271 		cell->name = tscadc->data->secondary_feature_name;
272 		cell->of_compatible = tscadc->data->secondary_feature_compatible;
273 		cell->platform_data = &tscadc;
274 		cell->pdata_size = sizeof(tscadc);
279 		cell = &tscadc->cells[cell_idx++];
280 		cell->name = tscadc->data->adc_feature_name;
281 		cell->of_compatible = tscadc->data->adc_feature_compatible;
282 		cell->platform_data = &tscadc;
283 		cell->pdata_size = sizeof(tscadc);
287 			      tscadc->cells, cell_idx, NULL, 0, NULL);
291 	platform_set_drvdata(pdev, tscadc);
303 	struct ti_tscadc_dev *tscadc = platform_get_drvdata(pdev);
305 	regmap_write(tscadc->regmap, REG_SE, 0x00);
310 	mfd_remove_devices(tscadc->dev);
320 	struct ti_tscadc_dev *tscadc = dev_get_drvdata(dev);
322 	regmap_write(tscadc->regmap, REG_SE, 0x00);
326 		regmap_read(tscadc->regmap, REG_CTRL, &ctrl);
329 		regmap_write(tscadc->regmap, REG_CTRL, ctrl);
338 	struct ti_tscadc_dev *tscadc = dev_get_drvdata(dev);
342 	regmap_write(tscadc->regmap, REG_CLKDIV, tscadc->clk_div);
343 	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl);
344 	tscadc_idle_config(tscadc);
345 	regmap_write(tscadc->regmap, REG_CTRL, tscadc->ctrl | CNTRLREG_SSENB);
369 	{ .compatible = "ti,am3359-tscadc", .data = &tscdata },
377 		.name   = "ti_am3359-tscadc",