projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 469dded1 AG |
1 | /* |
| 2 | * EEPROMs access control driver for display configuration EEPROMs | |
| 3 | * on DigsyMTC board. | |
| 4 | * | |
| 5 | * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de> | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/gpio.h> | |
| 13 | #include <linux/init.h> | |
| 14 | #include <linux/platform_device.h> | |
| 15 | #include <linux/spi/spi.h> | |
| 16 | #include <linux/spi/spi_gpio.h> | |
| 17 | #include <linux/eeprom_93xx46.h> | |
| 18 | ||
| 19 | #define GPIO_EEPROM_CLK 216 | |
| 20 | #define GPIO_EEPROM_CS 210 | |
| 21 | #define GPIO_EEPROM_DI 217 | |
| 22 | #define GPIO_EEPROM_DO 249 | |
| 23 | #define GPIO_EEPROM_OE 255 | |
| 24 | #define EE_SPI_BUS_NUM 1 | |
| 25 | ||
| 26 | static void digsy_mtc_op_prepare(void *p) | |
| 27 | { | |
| 28 | /* enable */ | |
| 29 | gpio_set_value(GPIO_EEPROM_OE, 0); | |
| 30 | } | |
| 31 | ||
| 32 | static void digsy_mtc_op_finish(void *p) | |
| 33 | { | |
| 34 | /* disable */ | |
| 35 | gpio_set_value(GPIO_EEPROM_OE, 1); | |
| 36 | } | |
| 37 | ||
| 38 | struct eeprom_93xx46_platform_data digsy_mtc_eeprom_data = { | |
| 39 | .flags = EE_ADDR8, | |
| 40 | .prepare = digsy_mtc_op_prepare, | |
| 41 | .finish = digsy_mtc_op_finish, | |
| 42 | }; | |
| 43 | ||
| 44 | static struct spi_gpio_platform_data eeprom_spi_gpio_data = { | |
| 45 | .sck = GPIO_EEPROM_CLK, | |
| 46 | .mosi = GPIO_EEPROM_DI, | |
| 47 | .miso = GPIO_EEPROM_DO, | |
| 48 | .num_chipselect = 1, | |
| 49 | }; | |
| 50 | ||
| 51 | static struct platform_device digsy_mtc_eeprom = { | |
| 52 | .name = "spi_gpio", | |
| 53 | .id = EE_SPI_BUS_NUM, | |
| 54 | .dev = { | |
| 55 | .platform_data = &eeprom_spi_gpio_data, | |
| 56 | }, | |
| 57 | }; | |
| 58 | ||
| 59 | static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = { | |
| 60 | { | |
| 61 | .modalias = "93xx46", | |
| 62 | .max_speed_hz = 1000000, | |
| 63 | .bus_num = EE_SPI_BUS_NUM, | |
| 64 | .chip_select = 0, | |
| 65 | .mode = SPI_MODE_0, | |
| 66 | .controller_data = (void *)GPIO_EEPROM_CS, | |
| 67 | .platform_data = &digsy_mtc_eeprom_data, | |
| 68 | }, | |
| 69 | }; | |
| 70 | ||
| 71 | static int __init digsy_mtc_eeprom_devices_init(void) | |
| 72 | { | |
| 73 | int ret; | |
| 74 | ||
| 75 | ret = gpio_request_one(GPIO_EEPROM_OE, GPIOF_OUT_INIT_HIGH, | |
| 76 | "93xx46 EEPROMs OE"); | |
| 77 | if (ret) { | |
| 78 | pr_err("can't request gpio %d\n", GPIO_EEPROM_OE); | |
| 79 | return ret; | |
| 80 | } | |
| 81 | spi_register_board_info(digsy_mtc_eeprom_info, | |
| 82 | ARRAY_SIZE(digsy_mtc_eeprom_info)); | |
| 83 | return platform_device_register(&digsy_mtc_eeprom); | |
| 84 | } | |
| 85 | device_initcall(digsy_mtc_eeprom_devices_init); |