1 // SPDX-License-Identifier: GPL-2.0+
3  * Renesas R-Car GyroADC driver
17 #include <linux/regulator/consumer.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/sysfs.h>
24 #include <linux/iio/trigger.h>
26 #define DRIVER_NAME				"rcar-gyroadc"
77 	const unsigned long clk_mhz = clk_get_rate(priv->clk) / 1000000;  in rcar_gyroadc_hw_init()
79 		(priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) ? 10 : 5;  in rcar_gyroadc_hw_init()
83 	 * According to the R-Car Gen2 datasheet Rev. 1.01, Sept 08 2014,  in rcar_gyroadc_hw_init()
84 	 * page 77-7, clock length must be even number. If it's odd number,  in rcar_gyroadc_hw_init()
91 	writel(0, priv->regs + RCAR_GYROADC_START_STOP);  in rcar_gyroadc_hw_init()
94 	if (priv->model == RCAR_GYROADC_MODEL_R8A7792)  in rcar_gyroadc_hw_init()
95 		writel(0, priv->regs + RCAR_GYROADC_INTENR);  in rcar_gyroadc_hw_init()
98 	writel(priv->mode, priv->regs + RCAR_GYROADC_MODE_SELECT);  in rcar_gyroadc_hw_init()
99 	writel(clk_len, priv->regs + RCAR_GYROADC_CLOCK_LENGTH);  in rcar_gyroadc_hw_init()
100 	writel(clk_mhz * 1250, priv->regs + RCAR_GYROADC_1_25MS_LENGTH);  in rcar_gyroadc_hw_init()
107 	       priv->regs + RCAR_GYROADC_START_STOP);  in rcar_gyroadc_hw_start()
121 	writel(0, priv->regs + RCAR_GYROADC_START_STOP);  in rcar_gyroadc_hw_stop()
164 	struct device *dev = priv->dev;  in rcar_gyroadc_set_power()
179 	struct regulator *consumer;  in rcar_gyroadc_read_raw()  local
180 	unsigned int datareg = RCAR_GYROADC_REALTIME_DATA(chan->channel);  in rcar_gyroadc_read_raw()
188 	if (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A)  in rcar_gyroadc_read_raw()
189 		consumer = priv->vref[0];  in rcar_gyroadc_read_raw()
191 		consumer = priv->vref[chan->channel];  in rcar_gyroadc_read_raw()
195 		if (chan->type != IIO_VOLTAGE)  in rcar_gyroadc_read_raw()
196 			return -EINVAL;  in rcar_gyroadc_read_raw()
199 		if (!consumer)  in rcar_gyroadc_read_raw()
200 			return -EINVAL;  in rcar_gyroadc_read_raw()
212 		*val = readl(priv->regs + datareg);  in rcar_gyroadc_read_raw()
213 		*val &= BIT(priv->sample_width) - 1;  in rcar_gyroadc_read_raw()
223 		if (!consumer)  in rcar_gyroadc_read_raw()
224 			return -EINVAL;  in rcar_gyroadc_read_raw()
226 		vref = regulator_get_voltage(consumer);  in rcar_gyroadc_read_raw()
228 		*val2 = 1 << priv->sample_width;  in rcar_gyroadc_read_raw()
236 		return -EINVAL;  in rcar_gyroadc_read_raw()
248 		return -EINVAL;  in rcar_gyroadc_reg_access()
251 		return -EINVAL;  in rcar_gyroadc_reg_access()
254 	if (priv->model == RCAR_GYROADC_MODEL_R8A7792)  in rcar_gyroadc_reg_access()
258 		return -EINVAL;  in rcar_gyroadc_reg_access()
260 	*readval = readl(priv->regs + reg);  in rcar_gyroadc_reg_access()
272 		/* R-Car compatible GyroADC */
273 		.compatible	= "renesas,rcar-gyroadc",
276 		/* R-Car V2H specialty with interrupt registers. */
277 		.compatible	= "renesas,r8a7792-gyroadc",
319 	struct device *dev = priv->dev;  in rcar_gyroadc_parse_subdevs()
320 	struct device_node *np = dev->of_node;  in rcar_gyroadc_parse_subdevs()
323 	unsigned int adcmode = -1, childmode;  in rcar_gyroadc_parse_subdevs()
336 		childmode = (uintptr_t)of_id->data;  in rcar_gyroadc_parse_subdevs()
354 			return -EINVAL;  in rcar_gyroadc_parse_subdevs()
379 				return -EINVAL;  in rcar_gyroadc_parse_subdevs()
388 			return -EINVAL;  in rcar_gyroadc_parse_subdevs()
392 		dev->of_node = child;  in rcar_gyroadc_parse_subdevs()
394 		dev->of_node = np;  in rcar_gyroadc_parse_subdevs()
401 		priv->vref[reg] = vref;  in rcar_gyroadc_parse_subdevs()
410 		priv->num_channels = num_channels;  in rcar_gyroadc_parse_subdevs()
411 		priv->mode = childmode;  in rcar_gyroadc_parse_subdevs()
412 		priv->sample_width = sample_width;  in rcar_gyroadc_parse_subdevs()
414 		indio_dev->channels = channels;  in rcar_gyroadc_parse_subdevs()
415 		indio_dev->num_channels = num_channels;  in rcar_gyroadc_parse_subdevs()
429 		return -EINVAL;  in rcar_gyroadc_parse_subdevs()
440 	for (i = 0; i < priv->num_channels; i++) {  in rcar_gyroadc_deinit_supplies()
441 		if (!priv->vref[i])  in rcar_gyroadc_deinit_supplies()
444 		regulator_disable(priv->vref[i]);  in rcar_gyroadc_deinit_supplies()
451 	struct device *dev = priv->dev;  in rcar_gyroadc_init_supplies()
455 	for (i = 0; i < priv->num_channels; i++) {  in rcar_gyroadc_init_supplies()
456 		if (!priv->vref[i])  in rcar_gyroadc_init_supplies()
459 		ret = regulator_enable(priv->vref[i]);  in rcar_gyroadc_init_supplies()
476 	struct device *dev = &pdev->dev;  in rcar_gyroadc_probe()
483 		return -ENOMEM;  in rcar_gyroadc_probe()
486 	priv->dev = dev;  in rcar_gyroadc_probe()
488 	priv->regs = devm_platform_ioremap_resource(pdev, 0);  in rcar_gyroadc_probe()
489 	if (IS_ERR(priv->regs))  in rcar_gyroadc_probe()
490 		return PTR_ERR(priv->regs);  in rcar_gyroadc_probe()
492 	priv->clk = devm_clk_get(dev, "fck");  in rcar_gyroadc_probe()
493 	if (IS_ERR(priv->clk))  in rcar_gyroadc_probe()
494 		return dev_err_probe(dev, PTR_ERR(priv->clk),  in rcar_gyroadc_probe()
505 	priv->model = (uintptr_t)of_device_get_match_data(&pdev->dev);  in rcar_gyroadc_probe()
509 	indio_dev->name = DRIVER_NAME;  in rcar_gyroadc_probe()
510 	indio_dev->info = &rcar_gyroadc_iio_info;  in rcar_gyroadc_probe()
511 	indio_dev->modes = INDIO_DIRECT_MODE;  in rcar_gyroadc_probe()
513 	ret = clk_prepare_enable(priv->clk);  in rcar_gyroadc_probe()
532 		dev_err(dev, "Couldn't register IIO device.\n");  in rcar_gyroadc_probe()
546 	clk_disable_unprepare(priv->clk);  in rcar_gyroadc_probe()
557 	struct device *dev = priv->dev;  in rcar_gyroadc_remove()
565 	clk_disable_unprepare(priv->clk);  in rcar_gyroadc_remove()
606 MODULE_DESCRIPTION("Renesas R-Car GyroADC driver");