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245 lines
6.1 KiB
245 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* drivers/net/wan/slic_ds26522.c |
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* |
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* Copyright (C) 2016 Freescale Semiconductor, Inc. |
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* |
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* Author:Zhao Qiang<[email protected]> |
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*/ |
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#include <linux/bitrev.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/kernel.h> |
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#include <linux/sched.h> |
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#include <linux/kthread.h> |
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#include <linux/spi/spi.h> |
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#include <linux/wait.h> |
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#include <linux/param.h> |
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#include <linux/delay.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <linux/io.h> |
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#include "slic_ds26522.h" |
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#define SLIC_TRANS_LEN 1 |
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#define SLIC_TWO_LEN 2 |
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#define SLIC_THREE_LEN 3 |
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static struct spi_device *g_spi; |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Zhao Qiang<[email protected]>"); |
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/* the read/write format of address is |
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* w/r|A13|A12|A11|A10|A9|A8|A7|A6|A5|A4|A3|A2|A1|A0|x |
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*/ |
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static void slic_write(struct spi_device *spi, u16 addr, |
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u8 data) |
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{ |
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u8 temp[3]; |
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addr = bitrev16(addr) >> 1; |
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data = bitrev8(data); |
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temp[0] = (u8)((addr >> 8) & 0x7f); |
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temp[1] = (u8)(addr & 0xfe); |
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temp[2] = data; |
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/* write spi addr and value */ |
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spi_write(spi, &temp[0], SLIC_THREE_LEN); |
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} |
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static u8 slic_read(struct spi_device *spi, u16 addr) |
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{ |
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u8 temp[2]; |
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u8 data; |
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addr = bitrev16(addr) >> 1; |
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temp[0] = (u8)(((addr >> 8) & 0x7f) | 0x80); |
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temp[1] = (u8)(addr & 0xfe); |
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spi_write_then_read(spi, &temp[0], SLIC_TWO_LEN, &data, |
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SLIC_TRANS_LEN); |
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data = bitrev8(data); |
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return data; |
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} |
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static bool get_slic_product_code(struct spi_device *spi) |
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{ |
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u8 device_id; |
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device_id = slic_read(spi, DS26522_IDR_ADDR); |
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if ((device_id & 0xf8) == 0x68) |
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return true; |
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else |
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return false; |
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} |
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static void ds26522_e1_spec_config(struct spi_device *spi) |
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{ |
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/* Receive E1 Mode, Framer Disabled */ |
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slic_write(spi, DS26522_RMMR_ADDR, DS26522_RMMR_E1); |
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/* Transmit E1 Mode, Framer Disable */ |
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slic_write(spi, DS26522_TMMR_ADDR, DS26522_TMMR_E1); |
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/* Receive E1 Mode Framer Enable */ |
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slic_write(spi, DS26522_RMMR_ADDR, |
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slic_read(spi, DS26522_RMMR_ADDR) | DS26522_RMMR_FRM_EN); |
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/* Transmit E1 Mode Framer Enable */ |
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slic_write(spi, DS26522_TMMR_ADDR, |
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slic_read(spi, DS26522_TMMR_ADDR) | DS26522_TMMR_FRM_EN); |
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/* RCR1, receive E1 B8zs & ESF */ |
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slic_write(spi, DS26522_RCR1_ADDR, |
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DS26522_RCR1_E1_HDB3 | DS26522_RCR1_E1_CCS); |
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/* RSYSCLK=2.048MHz, RSYNC-Output */ |
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slic_write(spi, DS26522_RIOCR_ADDR, |
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DS26522_RIOCR_2048KHZ | DS26522_RIOCR_RSIO_OUT); |
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/* TCR1 Transmit E1 b8zs */ |
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slic_write(spi, DS26522_TCR1_ADDR, DS26522_TCR1_TB8ZS); |
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/* TSYSCLK=2.048MHz, TSYNC-Output */ |
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slic_write(spi, DS26522_TIOCR_ADDR, |
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DS26522_TIOCR_2048KHZ | DS26522_TIOCR_TSIO_OUT); |
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/* Set E1TAF */ |
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slic_write(spi, DS26522_E1TAF_ADDR, DS26522_E1TAF_DEFAULT); |
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/* Set E1TNAF register */ |
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slic_write(spi, DS26522_E1TNAF_ADDR, DS26522_E1TNAF_DEFAULT); |
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/* Receive E1 Mode Framer Enable & init Done */ |
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slic_write(spi, DS26522_RMMR_ADDR, slic_read(spi, DS26522_RMMR_ADDR) | |
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DS26522_RMMR_INIT_DONE); |
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/* Transmit E1 Mode Framer Enable & init Done */ |
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slic_write(spi, DS26522_TMMR_ADDR, slic_read(spi, DS26522_TMMR_ADDR) | |
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DS26522_TMMR_INIT_DONE); |
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/* Configure LIU E1 mode */ |
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slic_write(spi, DS26522_LTRCR_ADDR, DS26522_LTRCR_E1); |
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/* E1 Mode default 75 ohm w/Transmit Impedance Matlinking */ |
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slic_write(spi, DS26522_LTITSR_ADDR, |
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DS26522_LTITSR_TLIS_75OHM | DS26522_LTITSR_LBOS_75OHM); |
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/* E1 Mode default 75 ohm Long Haul w/Receive Impedance Matlinking */ |
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slic_write(spi, DS26522_LRISMR_ADDR, |
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DS26522_LRISMR_75OHM | DS26522_LRISMR_MAX); |
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/* Enable Transmit output */ |
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slic_write(spi, DS26522_LMCR_ADDR, DS26522_LMCR_TE); |
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} |
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static int slic_ds26522_init_configure(struct spi_device *spi) |
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{ |
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u16 addr; |
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/* set clock */ |
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slic_write(spi, DS26522_GTCCR_ADDR, DS26522_GTCCR_BPREFSEL_REFCLKIN | |
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DS26522_GTCCR_BFREQSEL_2048KHZ | |
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DS26522_GTCCR_FREQSEL_2048KHZ); |
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slic_write(spi, DS26522_GTCR2_ADDR, DS26522_GTCR2_TSSYNCOUT); |
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slic_write(spi, DS26522_GFCR_ADDR, DS26522_GFCR_BPCLK_2048KHZ); |
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/* set gtcr */ |
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slic_write(spi, DS26522_GTCR1_ADDR, DS26522_GTCR1); |
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/* Global LIU Software Reset Register */ |
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slic_write(spi, DS26522_GLSRR_ADDR, DS26522_GLSRR_RESET); |
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/* Global Framer and BERT Software Reset Register */ |
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slic_write(spi, DS26522_GFSRR_ADDR, DS26522_GFSRR_RESET); |
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usleep_range(100, 120); |
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slic_write(spi, DS26522_GLSRR_ADDR, DS26522_GLSRR_NORMAL); |
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slic_write(spi, DS26522_GFSRR_ADDR, DS26522_GFSRR_NORMAL); |
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/* Perform RX/TX SRESET,Reset receiver */ |
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slic_write(spi, DS26522_RMMR_ADDR, DS26522_RMMR_SFTRST); |
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/* Reset tranceiver */ |
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slic_write(spi, DS26522_TMMR_ADDR, DS26522_TMMR_SFTRST); |
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usleep_range(100, 120); |
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/* Zero all Framer Registers */ |
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for (addr = DS26522_RF_ADDR_START; addr <= DS26522_RF_ADDR_END; |
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addr++) |
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slic_write(spi, addr, 0); |
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for (addr = DS26522_TF_ADDR_START; addr <= DS26522_TF_ADDR_END; |
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addr++) |
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slic_write(spi, addr, 0); |
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for (addr = DS26522_LIU_ADDR_START; addr <= DS26522_LIU_ADDR_END; |
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addr++) |
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slic_write(spi, addr, 0); |
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for (addr = DS26522_BERT_ADDR_START; addr <= DS26522_BERT_ADDR_END; |
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addr++) |
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slic_write(spi, addr, 0); |
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/* setup ds26522 for E1 specification */ |
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ds26522_e1_spec_config(spi); |
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slic_write(spi, DS26522_GTCR1_ADDR, 0x00); |
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return 0; |
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} |
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static int slic_ds26522_remove(struct spi_device *spi) |
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{ |
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pr_info("DS26522 module uninstalled\n"); |
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return 0; |
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} |
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static int slic_ds26522_probe(struct spi_device *spi) |
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{ |
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int ret = 0; |
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g_spi = spi; |
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spi->bits_per_word = 8; |
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if (!get_slic_product_code(spi)) |
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return ret; |
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ret = slic_ds26522_init_configure(spi); |
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if (ret == 0) |
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pr_info("DS26522 cs%d configured\n", spi->chip_select); |
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return ret; |
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} |
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static const struct spi_device_id slic_ds26522_id[] = { |
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{ .name = "ds26522" }, |
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{ /* sentinel */ }, |
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}; |
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MODULE_DEVICE_TABLE(spi, slic_ds26522_id); |
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static const struct of_device_id slic_ds26522_match[] = { |
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{ |
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.compatible = "maxim,ds26522", |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, slic_ds26522_match); |
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static struct spi_driver slic_ds26522_driver = { |
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.driver = { |
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.name = "ds26522", |
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.bus = &spi_bus_type, |
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.of_match_table = slic_ds26522_match, |
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}, |
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.probe = slic_ds26522_probe, |
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.remove = slic_ds26522_remove, |
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.id_table = slic_ds26522_id, |
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}; |
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module_spi_driver(slic_ds26522_driver);
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