1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // cs35l41-spi.c -- CS35l41 SPI driver 4 // 5 // Copyright 2017-2021 Cirrus Logic, Inc. 6 // 7 // Author: David Rhodes <david.rhodes@cirrus.com> 8 9 #include <linux/acpi.h> 10 #include <linux/delay.h> 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/moduleparam.h> 15 #include <linux/platform_device.h> 16 #include <linux/spi/spi.h> 17 18 #include <sound/cs35l41.h> 19 #include "cs35l41.h" 20 21 static const struct spi_device_id cs35l41_id_spi[] = { 22 { "cs35l40", 0 }, 23 { "cs35l41", 0 }, 24 {} 25 }; 26 27 MODULE_DEVICE_TABLE(spi, cs35l41_id_spi); 28 29 static void cs35l41_spi_otp_setup(struct cs35l41_private *cs35l41, 30 bool is_pre_setup, unsigned int *freq) 31 { 32 struct spi_device *spi; 33 u32 orig_spi_freq; 34 35 spi = to_spi_device(cs35l41->dev); 36 37 if (!spi) { 38 dev_err(cs35l41->dev, "%s: No SPI device\n", __func__); 39 return; 40 } 41 42 if (is_pre_setup) { 43 orig_spi_freq = spi->max_speed_hz; 44 if (orig_spi_freq > CS35L41_SPI_MAX_FREQ_OTP) { 45 spi->max_speed_hz = CS35L41_SPI_MAX_FREQ_OTP; 46 spi_setup(spi); 47 } 48 *freq = orig_spi_freq; 49 } else { 50 if (spi->max_speed_hz != *freq) { 51 spi->max_speed_hz = *freq; 52 spi_setup(spi); 53 } 54 } 55 } 56 57 static int cs35l41_spi_probe(struct spi_device *spi) 58 { 59 const struct regmap_config *regmap_config = &cs35l41_regmap_spi; 60 struct cs35l41_platform_data *pdata = dev_get_platdata(&spi->dev); 61 struct cs35l41_private *cs35l41; 62 int ret; 63 64 cs35l41 = devm_kzalloc(&spi->dev, sizeof(struct cs35l41_private), GFP_KERNEL); 65 if (!cs35l41) 66 return -ENOMEM; 67 68 spi_set_drvdata(spi, cs35l41); 69 cs35l41->regmap = devm_regmap_init_spi(spi, regmap_config); 70 if (IS_ERR(cs35l41->regmap)) { 71 ret = PTR_ERR(cs35l41->regmap); 72 dev_err(&spi->dev, "Failed to allocate register map: %d\n", ret); 73 return ret; 74 } 75 76 cs35l41->dev = &spi->dev; 77 cs35l41->irq = spi->irq; 78 cs35l41->otp_setup = cs35l41_spi_otp_setup; 79 80 return cs35l41_probe(cs35l41, pdata); 81 } 82 83 static int cs35l41_spi_remove(struct spi_device *spi) 84 { 85 struct cs35l41_private *cs35l41 = spi_get_drvdata(spi); 86 87 cs35l41_remove(cs35l41); 88 89 return 0; 90 } 91 92 #ifdef CONFIG_OF 93 static const struct of_device_id cs35l41_of_match[] = { 94 { .compatible = "cirrus,cs35l40" }, 95 { .compatible = "cirrus,cs35l41" }, 96 {}, 97 }; 98 MODULE_DEVICE_TABLE(of, cs35l41_of_match); 99 #endif 100 101 #ifdef CONFIG_ACPI 102 static const struct acpi_device_id cs35l41_acpi_match[] = { 103 { "CSC3541", 0 }, /* Cirrus Logic PnP ID + part ID */ 104 {}, 105 }; 106 MODULE_DEVICE_TABLE(acpi, cs35l41_acpi_match); 107 #endif 108 109 static struct spi_driver cs35l41_spi_driver = { 110 .driver = { 111 .name = "cs35l41", 112 .of_match_table = of_match_ptr(cs35l41_of_match), 113 .acpi_match_table = ACPI_PTR(cs35l41_acpi_match), 114 }, 115 .id_table = cs35l41_id_spi, 116 .probe = cs35l41_spi_probe, 117 .remove = cs35l41_spi_remove, 118 }; 119 120 module_spi_driver(cs35l41_spi_driver); 121 122 MODULE_DESCRIPTION("SPI CS35L41 driver"); 123 MODULE_AUTHOR("David Rhodes, Cirrus Logic Inc, <david.rhodes@cirrus.com>"); 124 MODULE_LICENSE("GPL"); 125