projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 36e52873 MO |
1 | /* |
| 2 | * tps65912-spi.c -- SPI access for TI TPS65912x PMIC | |
| 3 | * | |
| 4 | * Copyright 2011 Texas Instruments Inc. | |
| 5 | * | |
| 6 | * Author: Margarita Olaya Cabrera <[email protected]> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify it | |
| 9 | * under the terms of the GNU General Public License as published by the | |
| 10 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 11 | * option) any later version. | |
| 12 | * | |
| 13 | * This driver is based on wm8350 implementation. | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/module.h> | |
| 17 | #include <linux/moduleparam.h> | |
| 18 | #include <linux/init.h> | |
| 19 | #include <linux/slab.h> | |
| 20 | #include <linux/gpio.h> | |
| 21 | #include <linux/spi/spi.h> | |
| 22 | #include <linux/mfd/core.h> | |
| 23 | #include <linux/mfd/tps65912.h> | |
| 24 | ||
| 25 | static int tps65912_spi_write(struct tps65912 *tps65912, u8 addr, | |
| 26 | int bytes, void *src) | |
| 27 | { | |
| 28 | struct spi_device *spi = tps65912->control_data; | |
| 29 | u8 *data = (u8 *) src; | |
| 30 | int ret; | |
| 31 | /* bit 23 is the read/write bit */ | |
| 32 | unsigned long spi_data = 1 << 23 | addr << 15 | *data; | |
| 33 | struct spi_transfer xfer; | |
| 34 | struct spi_message msg; | |
| 35 | u32 tx_buf, rx_buf; | |
| 36 | ||
| 37 | tx_buf = spi_data; | |
| 38 | rx_buf = 0; | |
| 39 | ||
| 40 | xfer.tx_buf = &tx_buf; | |
| 41 | xfer.rx_buf = NULL; | |
| 42 | xfer.len = sizeof(unsigned long); | |
| 43 | xfer.bits_per_word = 24; | |
| 44 | ||
| 45 | spi_message_init(&msg); | |
| 46 | spi_message_add_tail(&xfer, &msg); | |
| 47 | ||
| 48 | ret = spi_sync(spi, &msg); | |
| 49 | return ret; | |
| 50 | } | |
| 51 | ||
| 52 | static int tps65912_spi_read(struct tps65912 *tps65912, u8 addr, | |
| 53 | int bytes, void *dest) | |
| 54 | { | |
| 55 | struct spi_device *spi = tps65912->control_data; | |
| 56 | /* bit 23 is the read/write bit */ | |
| 57 | unsigned long spi_data = 0 << 23 | addr << 15; | |
| 58 | struct spi_transfer xfer; | |
| 59 | struct spi_message msg; | |
| 60 | int ret; | |
| 61 | u8 *data = (u8 *) dest; | |
| 62 | u32 tx_buf, rx_buf; | |
| 63 | ||
| 64 | tx_buf = spi_data; | |
| 65 | rx_buf = 0; | |
| 66 | ||
| 67 | xfer.tx_buf = &tx_buf; | |
| 68 | xfer.rx_buf = &rx_buf; | |
| 69 | xfer.len = sizeof(unsigned long); | |
| 70 | xfer.bits_per_word = 24; | |
| 71 | ||
| 72 | spi_message_init(&msg); | |
| 73 | spi_message_add_tail(&xfer, &msg); | |
| 74 | ||
| 75 | if (spi == NULL) | |
| 76 | return 0; | |
| 77 | ||
| 78 | ret = spi_sync(spi, &msg); | |
| 79 | if (ret == 0) | |
| 80 | *data = (u8) (rx_buf & 0xFF); | |
| 81 | return ret; | |
| 82 | } | |
| 83 | ||
| 84 | static int __devinit tps65912_spi_probe(struct spi_device *spi) | |
| 85 | { | |
| 86 | struct tps65912 *tps65912; | |
| 87 | ||
| 88 | tps65912 = kzalloc(sizeof(struct tps65912), GFP_KERNEL); | |
| 89 | if (tps65912 == NULL) | |
| 90 | return -ENOMEM; | |
| 91 | ||
| 92 | tps65912->dev = &spi->dev; | |
| 93 | tps65912->control_data = spi; | |
| 94 | tps65912->read = tps65912_spi_read; | |
| 95 | tps65912->write = tps65912_spi_write; | |
| 96 | ||
| 97 | spi_set_drvdata(spi, tps65912); | |
| 98 | ||
| 99 | return tps65912_device_init(tps65912); | |
| 100 | } | |
| 101 | ||
| 102 | static int __devexit tps65912_spi_remove(struct spi_device *spi) | |
| 103 | { | |
| 104 | struct tps65912 *tps65912 = spi_get_drvdata(spi); | |
| 105 | ||
| 106 | tps65912_device_exit(tps65912); | |
| 107 | ||
| 108 | return 0; | |
| 109 | } | |
| 110 | ||
| 111 | static struct spi_driver tps65912_spi_driver = { | |
| 112 | .driver = { | |
| 113 | .name = "tps65912", | |
| 36e52873 MO |
114 | .owner = THIS_MODULE, |
| 115 | }, | |
| 116 | .probe = tps65912_spi_probe, | |
| 117 | .remove = __devexit_p(tps65912_spi_remove), | |
| 118 | }; | |
| 119 | ||
| 120 | static int __init tps65912_spi_init(void) | |
| 121 | { | |
| 122 | int ret; | |
| 123 | ||
| 124 | ret = spi_register_driver(&tps65912_spi_driver); | |
| 125 | if (ret != 0) | |
| 126 | pr_err("Failed to register TPS65912 SPI driver: %d\n", ret); | |
| 127 | ||
| 128 | return 0; | |
| 129 | } | |
| 130 | /* init early so consumer devices can complete system boot */ | |
| 131 | subsys_initcall(tps65912_spi_init); | |
| 132 | ||
| 133 | static void __exit tps65912_spi_exit(void) | |
| 134 | { | |
| 135 | spi_unregister_driver(&tps65912_spi_driver); | |
| 136 | } | |
| 137 | module_exit(tps65912_spi_exit); | |
| 138 | ||
| 139 | MODULE_AUTHOR("Margarita Olaya <[email protected]>"); | |
| 140 | MODULE_DESCRIPTION("SPI support for TPS65912 chip family mfd"); | |
| 141 | MODULE_LICENSE("GPL"); |