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260 lines
6.7 KiB
260 lines
6.7 KiB
// 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 <[email protected]> |
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* |
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* Authors: |
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* Marek Vasut <[email protected]> |
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* Ksenija Stanojevic <[email protected]> |
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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 <[email protected]>"); |
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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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