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 struct regmap_config cs35l41_regmap_spi = { 22 .reg_bits = 32, 23 .val_bits = 32, 24 .pad_bits = 16, 25 .reg_stride = CS35L41_REGSTRIDE, 26 .reg_format_endian = REGMAP_ENDIAN_BIG, 27 .val_format_endian = REGMAP_ENDIAN_BIG, 28 .max_register = CS35L41_LASTREG, 29 .reg_defaults = cs35l41_reg, 30 .num_reg_defaults = ARRAY_SIZE(cs35l41_reg), 31 .volatile_reg = cs35l41_volatile_reg, 32 .readable_reg = cs35l41_readable_reg, 33 .precious_reg = cs35l41_precious_reg, 34 .cache_type = REGCACHE_RBTREE, 35 }; 36 37 static const struct spi_device_id cs35l41_id_spi[] = { 38 { "cs35l40", 0 }, 39 { "cs35l41", 0 }, 40 {} 41 }; 42 43 MODULE_DEVICE_TABLE(spi, cs35l41_id_spi); 44 45 static void cs35l41_spi_otp_setup(struct cs35l41_private *cs35l41, 46 bool is_pre_setup, unsigned int *freq) 47 { 48 struct spi_device *spi; 49 u32 orig_spi_freq; 50 51 spi = to_spi_device(cs35l41->dev); 52 53 if (!spi) { 54 dev_err(cs35l41->dev, "%s: No SPI device\n", __func__); 55 return; 56 } 57 58 if (is_pre_setup) { 59 orig_spi_freq = spi->max_speed_hz; 60 if (orig_spi_freq > CS35L41_SPI_MAX_FREQ_OTP) { 61 spi->max_speed_hz = CS35L41_SPI_MAX_FREQ_OTP; 62 spi_setup(spi); 63 } 64 *freq = orig_spi_freq; 65 } else { 66 if (spi->max_speed_hz != *freq) { 67 spi->max_speed_hz = *freq; 68 spi_setup(spi); 69 } 70 } 71 } 72 73 static int cs35l41_spi_probe(struct spi_device *spi) 74 { 75 const struct regmap_config *regmap_config = &cs35l41_regmap_spi; 76 struct cs35l41_platform_data *pdata = dev_get_platdata(&spi->dev); 77 struct cs35l41_private *cs35l41; 78 int ret; 79 80 cs35l41 = devm_kzalloc(&spi->dev, sizeof(struct cs35l41_private), GFP_KERNEL); 81 if (!cs35l41) 82 return -ENOMEM; 83 84 spi_set_drvdata(spi, cs35l41); 85 cs35l41->regmap = devm_regmap_init_spi(spi, regmap_config); 86 if (IS_ERR(cs35l41->regmap)) { 87 ret = PTR_ERR(cs35l41->regmap); 88 dev_err(&spi->dev, "Failed to allocate register map: %d\n", ret); 89 return ret; 90 } 91 92 cs35l41->dev = &spi->dev; 93 cs35l41->irq = spi->irq; 94 cs35l41->otp_setup = cs35l41_spi_otp_setup; 95 96 return cs35l41_probe(cs35l41, pdata); 97 } 98 99 static int cs35l41_spi_remove(struct spi_device *spi) 100 { 101 struct cs35l41_private *cs35l41 = spi_get_drvdata(spi); 102 103 cs35l41_remove(cs35l41); 104 105 return 0; 106 } 107 108 #ifdef CONFIG_OF 109 static const struct of_device_id cs35l41_of_match[] = { 110 { .compatible = "cirrus,cs35l40" }, 111 { .compatible = "cirrus,cs35l41" }, 112 {}, 113 }; 114 MODULE_DEVICE_TABLE(of, cs35l41_of_match); 115 #endif 116 117 #ifdef CONFIG_ACPI 118 static const struct acpi_device_id cs35l41_acpi_match[] = { 119 { "CSC3541", 0 }, /* Cirrus Logic PnP ID + part ID */ 120 {}, 121 }; 122 MODULE_DEVICE_TABLE(acpi, cs35l41_acpi_match); 123 #endif 124 125 static struct spi_driver cs35l41_spi_driver = { 126 .driver = { 127 .name = "cs35l41", 128 .of_match_table = of_match_ptr(cs35l41_of_match), 129 .acpi_match_table = ACPI_PTR(cs35l41_acpi_match), 130 }, 131 .id_table = cs35l41_id_spi, 132 .probe = cs35l41_spi_probe, 133 .remove = cs35l41_spi_remove, 134 }; 135 136 module_spi_driver(cs35l41_spi_driver); 137 138 MODULE_DESCRIPTION("SPI CS35L41 driver"); 139 MODULE_AUTHOR("David Rhodes, Cirrus Logic Inc, <david.rhodes@cirrus.com>"); 140 MODULE_LICENSE("GPL"); 141