1 // SPDX-License-Identifier: GPL-2.0
3  *  STMicroelectronics STMPE811 IIO ADC Driver
5  *  4 channel, 10/12-bit ADC
7  *  Copyright (C) 2013-2018 Toradex AG <stefan.agner@toradex.com>
62 		struct iio_chan_spec const *chan, int *val)  in stmpe_read_voltage()  argument
66 	mutex_lock(&info->lock);  in stmpe_read_voltage()
68 	reinit_completion(&info->completion);  in stmpe_read_voltage()
70 	info->channel = (u8)chan->channel;  in stmpe_read_voltage()
72 	if (info->channel > STMPE_ADC_LAST_NR) {  in stmpe_read_voltage()
73 		mutex_unlock(&info->lock);  in stmpe_read_voltage()
74 		return -EINVAL;  in stmpe_read_voltage()
77 	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_CAPT,  in stmpe_read_voltage()
78 			STMPE_ADC_CH(info->channel));  in stmpe_read_voltage()
80 	ret = wait_for_completion_timeout(&info->completion, STMPE_ADC_TIMEOUT);  in stmpe_read_voltage()
83 		stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA,  in stmpe_read_voltage()
84 				STMPE_ADC_CH(info->channel));  in stmpe_read_voltage()
85 		mutex_unlock(&info->lock);  in stmpe_read_voltage()
86 		return -ETIMEDOUT;  in stmpe_read_voltage()
89 	*val = info->value;  in stmpe_read_voltage()
91 	mutex_unlock(&info->lock);  in stmpe_read_voltage()
97 		struct iio_chan_spec const *chan, int *val)  in stmpe_read_temp()  argument
101 	mutex_lock(&info->lock);  in stmpe_read_temp()
103 	reinit_completion(&info->completion);  in stmpe_read_temp()
105 	info->channel = (u8)chan->channel;  in stmpe_read_temp()
107 	if (info->channel != STMPE_TEMP_CHANNEL) {  in stmpe_read_temp()
108 		mutex_unlock(&info->lock);  in stmpe_read_temp()
109 		return -EINVAL;  in stmpe_read_temp()
112 	stmpe_reg_write(info->stmpe, STMPE_REG_TEMP_CTRL,  in stmpe_read_temp()
115 	ret = wait_for_completion_timeout(&info->completion, STMPE_ADC_TIMEOUT);  in stmpe_read_temp()
118 		mutex_unlock(&info->lock);  in stmpe_read_temp()
119 		return -ETIMEDOUT;  in stmpe_read_temp()
126 	*val = ((449960l * info->value) / 1024l) - 273150;  in stmpe_read_temp()
128 	mutex_unlock(&info->lock);  in stmpe_read_temp()
134 			  struct iio_chan_spec const *chan,  in stmpe_read_raw()  argument
146 		switch (chan->type) {  in stmpe_read_raw()
148 			ret = stmpe_read_voltage(info, chan, val);  in stmpe_read_raw()
152 			ret = stmpe_read_temp(info, chan, val);  in stmpe_read_raw()
155 			return -EINVAL;  in stmpe_read_raw()
165 		*val2 = info->stmpe->mod_12b ? 12 : 10;  in stmpe_read_raw()
172 	return -EINVAL;  in stmpe_read_raw()
180 	if (info->channel <= STMPE_ADC_LAST_NR) {  in stmpe_adc_isr()
183 		int_sta = stmpe_reg_read(info->stmpe, STMPE_REG_ADC_INT_STA);  in stmpe_adc_isr()
186 		if (!(int_sta & STMPE_ADC_CH(info->channel)))  in stmpe_adc_isr()
190 		stmpe_block_read(info->stmpe,  in stmpe_adc_isr()
191 			STMPE_REG_ADC_DATA_CH(info->channel), 2, (u8 *) &data);  in stmpe_adc_isr()
193 		stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA, int_sta);  in stmpe_adc_isr()
194 	} else if (info->channel == STMPE_TEMP_CHANNEL) {  in stmpe_adc_isr()
196 		stmpe_block_read(info->stmpe, STMPE_REG_TEMP_DATA, 2,  in stmpe_adc_isr()
202 	info->value = (u32) be16_to_cpu(data);  in stmpe_adc_isr()
203 	complete(&info->completion);  in stmpe_adc_isr()
212 static void stmpe_adc_voltage_chan(struct iio_chan_spec *ics, int chan)  in stmpe_adc_voltage_chan()  argument
214 	ics->type = IIO_VOLTAGE;  in stmpe_adc_voltage_chan()
215 	ics->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);  in stmpe_adc_voltage_chan()
216 	ics->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);  in stmpe_adc_voltage_chan()
217 	ics->indexed = 1;  in stmpe_adc_voltage_chan()
218 	ics->channel = chan;  in stmpe_adc_voltage_chan()
221 static void stmpe_adc_temp_chan(struct iio_chan_spec *ics, int chan)  in stmpe_adc_temp_chan()  argument
223 	ics->type = IIO_TEMP;  in stmpe_adc_temp_chan()
224 	ics->info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED);  in stmpe_adc_temp_chan()
225 	ics->indexed = 1;  in stmpe_adc_temp_chan()
226 	ics->channel = chan;  in stmpe_adc_temp_chan()
229 static int stmpe_adc_init_hw(struct stmpe_adc *adc)  in stmpe_adc_init_hw()  argument
232 	struct stmpe *stmpe = adc->stmpe;  in stmpe_adc_init_hw()
236 		dev_err(stmpe->dev, "Could not enable clock for ADC\n");  in stmpe_adc_init_hw()
268 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct stmpe_adc));  in stmpe_adc_probe()
270 		dev_err(&pdev->dev, "failed allocating iio device\n");  in stmpe_adc_probe()
271 		return -ENOMEM;  in stmpe_adc_probe()
275 	mutex_init(&info->lock);  in stmpe_adc_probe()
277 	init_completion(&info->completion);  in stmpe_adc_probe()
278 	ret = devm_request_threaded_irq(&pdev->dev, irq_adc, NULL,  in stmpe_adc_probe()
280 					"stmpe-adc", info);  in stmpe_adc_probe()
282 		dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",  in stmpe_adc_probe()
289 		ret = devm_request_threaded_irq(&pdev->dev, irq_temp, NULL,  in stmpe_adc_probe()
291 						"stmpe-adc", info);  in stmpe_adc_probe()
293 			dev_warn(&pdev->dev, "failed requesting irq for"  in stmpe_adc_probe()
299 	indio_dev->name		= dev_name(&pdev->dev);  in stmpe_adc_probe()
300 	indio_dev->info		= &stmpe_adc_iio_info;  in stmpe_adc_probe()
301 	indio_dev->modes	= INDIO_DIRECT_MODE;  in stmpe_adc_probe()
303 	info->stmpe = dev_get_drvdata(pdev->dev.parent);  in stmpe_adc_probe()
305 	np = pdev->dev.of_node;  in stmpe_adc_probe()
308 		dev_err(&pdev->dev, "no device tree node found\n");  in stmpe_adc_probe()
310 	of_property_read_u32(np, "st,norequest-mask", &norequest_mask);  in stmpe_adc_probe()
314 		stmpe_adc_voltage_chan(&info->stmpe_adc_iio_channels[num_chan], i);  in stmpe_adc_probe()
317 	stmpe_adc_temp_chan(&info->stmpe_adc_iio_channels[num_chan], i);  in stmpe_adc_probe()
319 	indio_dev->channels = info->stmpe_adc_iio_channels;  in stmpe_adc_probe()
320 	indio_dev->num_channels = num_chan;  in stmpe_adc_probe()
326 	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_EN,  in stmpe_adc_probe()
329 	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA,  in stmpe_adc_probe()
332 	return devm_iio_device_register(&pdev->dev, indio_dev);  in stmpe_adc_probe()
350 		.name	= "stmpe-adc",
357 	{ .compatible = "st,stmpe-adc", },
363 MODULE_DESCRIPTION("STMPEXXX ADC driver");
365 MODULE_ALIAS("platform:stmpe-adc");