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https://github.com/edk2-porting/linux-next.git
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df561f6688
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
261 lines
6.7 KiB
C
261 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Freescale MXS Low Resolution Analog-to-Digital Converter driver
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*
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* Copyright (c) 2012 DENX Software Engineering, GmbH.
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* Copyright (c) 2017 Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
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*
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* Authors:
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* Marek Vasut <marex@denx.de>
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* Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/mxs-lradc.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#define ADC_CELL 0
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#define TSC_CELL 1
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#define RES_MEM 0
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enum mx23_lradc_irqs {
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MX23_LRADC_TS_IRQ = 0,
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MX23_LRADC_CH0_IRQ,
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MX23_LRADC_CH1_IRQ,
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MX23_LRADC_CH2_IRQ,
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MX23_LRADC_CH3_IRQ,
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MX23_LRADC_CH4_IRQ,
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MX23_LRADC_CH5_IRQ,
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MX23_LRADC_CH6_IRQ,
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MX23_LRADC_CH7_IRQ,
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};
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enum mx28_lradc_irqs {
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MX28_LRADC_TS_IRQ = 0,
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MX28_LRADC_TRESH0_IRQ,
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MX28_LRADC_TRESH1_IRQ,
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MX28_LRADC_CH0_IRQ,
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MX28_LRADC_CH1_IRQ,
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MX28_LRADC_CH2_IRQ,
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MX28_LRADC_CH3_IRQ,
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MX28_LRADC_CH4_IRQ,
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MX28_LRADC_CH5_IRQ,
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MX28_LRADC_CH6_IRQ,
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MX28_LRADC_CH7_IRQ,
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MX28_LRADC_BUTTON0_IRQ,
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MX28_LRADC_BUTTON1_IRQ,
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};
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static struct resource mx23_adc_resources[] = {
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DEFINE_RES_MEM(0x0, 0x0),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
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};
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static struct resource mx23_touchscreen_resources[] = {
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DEFINE_RES_MEM(0x0, 0x0),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
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DEFINE_RES_IRQ_NAMED(MX23_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
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};
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static struct resource mx28_adc_resources[] = {
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DEFINE_RES_MEM(0x0, 0x0),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH0_IRQ, "mxs-lradc-thresh0"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_TRESH1_IRQ, "mxs-lradc-thresh1"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH0_IRQ, "mxs-lradc-channel0"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH1_IRQ, "mxs-lradc-channel1"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH2_IRQ, "mxs-lradc-channel2"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH3_IRQ, "mxs-lradc-channel3"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH4_IRQ, "mxs-lradc-channel4"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH5_IRQ, "mxs-lradc-channel5"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON0_IRQ, "mxs-lradc-button0"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_BUTTON1_IRQ, "mxs-lradc-button1"),
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};
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static struct resource mx28_touchscreen_resources[] = {
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DEFINE_RES_MEM(0x0, 0x0),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_TS_IRQ, "mxs-lradc-touchscreen"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH6_IRQ, "mxs-lradc-channel6"),
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DEFINE_RES_IRQ_NAMED(MX28_LRADC_CH7_IRQ, "mxs-lradc-channel7"),
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};
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static struct mfd_cell mx23_cells[] = {
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{
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.name = "mxs-lradc-adc",
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.resources = mx23_adc_resources,
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.num_resources = ARRAY_SIZE(mx23_adc_resources),
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},
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{
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.name = "mxs-lradc-ts",
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.resources = mx23_touchscreen_resources,
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.num_resources = ARRAY_SIZE(mx23_touchscreen_resources),
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},
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};
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static struct mfd_cell mx28_cells[] = {
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{
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.name = "mxs-lradc-adc",
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.resources = mx28_adc_resources,
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.num_resources = ARRAY_SIZE(mx28_adc_resources),
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},
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{
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.name = "mxs-lradc-ts",
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.resources = mx28_touchscreen_resources,
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.num_resources = ARRAY_SIZE(mx28_touchscreen_resources),
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}
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};
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static const struct of_device_id mxs_lradc_dt_ids[] = {
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{ .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
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{ .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
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static int mxs_lradc_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id;
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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struct mxs_lradc *lradc;
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struct mfd_cell *cells = NULL;
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struct resource *res;
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int ret = 0;
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u32 ts_wires = 0;
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lradc = devm_kzalloc(&pdev->dev, sizeof(*lradc), GFP_KERNEL);
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if (!lradc)
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return -ENOMEM;
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of_id = of_match_device(mxs_lradc_dt_ids, &pdev->dev);
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if (!of_id)
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return -EINVAL;
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lradc->soc = (enum mxs_lradc_id)of_id->data;
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lradc->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(lradc->clk)) {
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dev_err(dev, "Failed to get the delay unit clock\n");
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return PTR_ERR(lradc->clk);
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}
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ret = clk_prepare_enable(lradc->clk);
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if (ret) {
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dev_err(dev, "Failed to enable the delay unit clock\n");
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return ret;
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}
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ret = of_property_read_u32(node, "fsl,lradc-touchscreen-wires",
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&ts_wires);
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if (!ret) {
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lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
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switch (ts_wires) {
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case 4:
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lradc->touchscreen_wire = MXS_LRADC_TOUCHSCREEN_4WIRE;
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break;
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case 5:
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if (lradc->soc == IMX28_LRADC) {
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lradc->touchscreen_wire =
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MXS_LRADC_TOUCHSCREEN_5WIRE;
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break;
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}
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fallthrough; /* to an error message for i.MX23 */
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default:
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dev_err(&pdev->dev,
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"Unsupported number of touchscreen wires (%d)\n"
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, ts_wires);
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ret = -EINVAL;
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goto err_clk;
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}
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} else {
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lradc->buffer_vchans = BUFFER_VCHANS_ALL;
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}
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platform_set_drvdata(pdev, lradc);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res) {
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ret = -ENOMEM;
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goto err_clk;
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}
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switch (lradc->soc) {
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case IMX23_LRADC:
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mx23_adc_resources[RES_MEM] = *res;
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mx23_touchscreen_resources[RES_MEM] = *res;
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cells = mx23_cells;
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break;
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case IMX28_LRADC:
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mx28_adc_resources[RES_MEM] = *res;
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mx28_touchscreen_resources[RES_MEM] = *res;
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cells = mx28_cells;
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break;
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default:
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dev_err(dev, "Unsupported SoC\n");
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ret = -ENODEV;
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goto err_clk;
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}
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ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
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&cells[ADC_CELL], 1, NULL, 0, NULL);
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if (ret) {
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dev_err(&pdev->dev, "Failed to add the ADC subdevice\n");
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goto err_clk;
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}
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if (!lradc->touchscreen_wire)
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return 0;
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ret = devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
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&cells[TSC_CELL], 1, NULL, 0, NULL);
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if (ret) {
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dev_err(&pdev->dev,
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"Failed to add the touchscreen subdevice\n");
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goto err_clk;
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}
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return 0;
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err_clk:
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clk_disable_unprepare(lradc->clk);
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return ret;
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}
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static int mxs_lradc_remove(struct platform_device *pdev)
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{
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struct mxs_lradc *lradc = platform_get_drvdata(pdev);
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clk_disable_unprepare(lradc->clk);
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return 0;
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}
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static struct platform_driver mxs_lradc_driver = {
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.driver = {
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.name = "mxs-lradc",
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.of_match_table = mxs_lradc_dt_ids,
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},
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.probe = mxs_lradc_probe,
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.remove = mxs_lradc_remove,
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};
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module_platform_driver(mxs_lradc_driver);
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MODULE_AUTHOR("Ksenija Stanojevic <ksenija.stanojevic@gmail.com>");
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MODULE_DESCRIPTION("Freescale i.MX23/i.MX28 LRADC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:mxs-lradc");
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