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author | Lars-Peter Clausen <lars@metafoo.de> | 2009-05-18 17:55:41 +0000 |
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committer | Lars-Peter Clausen <lars@metafoo.de> | 2009-05-18 17:55:41 +0000 |
commit | f5affd4f36d839d706b02f1ffb69e0cf70c4140c (patch) | |
tree | 105a7093a2f5989136da5fe7128d6d95a3b9cad4 /target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c | |
parent | 267af10b33745d098198ad9c1d2b5ab69efb128f (diff) | |
download | upstream-f5affd4f36d839d706b02f1ffb69e0cf70c4140c.tar.gz upstream-f5affd4f36d839d706b02f1ffb69e0cf70c4140c.tar.bz2 upstream-f5affd4f36d839d706b02f1ffb69e0cf70c4140c.zip |
bump to 2.6.30-rc6
SVN-Revision: 15918
Diffstat (limited to 'target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c')
-rw-r--r-- | target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c b/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c new file mode 100644 index 0000000000..a7129fe798 --- /dev/null +++ b/target/linux/s3c24xx/files-2.6.30/drivers/mfd/glamo/glamo-lcm-spi.c @@ -0,0 +1,240 @@ +/* + * Copyright (C) 2007 Openmoko, Inc. + * Author: Harald Welte <laforge@openmoko.org> + * + * Smedia Glamo GPIO based SPI driver + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This driver currently only implements a minimum subset of the hardware + * features, esp. those features that are required to drive the jbt6k74 + * LCM controller asic in the TD028TTEC1 LCM. + * +*/ + +#define DEBUG + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/spinlock.h> +#include <linux/workqueue.h> +#include <linux/platform_device.h> + +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/spi/glamo.h> + +#include <linux/glamofb.h> + +#include <mach/hardware.h> + +#include "glamo-core.h" +#include "glamo-regs.h" + +struct glamo_spi { + struct spi_bitbang bitbang; + struct spi_master *master; + struct glamo_spi_info *info; + struct device *dev; +}; + +static inline struct glamo_spi *to_gs(struct spi_device *spi) +{ + return spi->controller_data; +} + +static int glamo_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t) +{ + unsigned int bpw; + + bpw = t ? t->bits_per_word : spi->bits_per_word; + + if (bpw != 9 && bpw != 8) { + dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw); + return -EINVAL; + } + + return 0; +} + +static void glamo_spi_chipsel(struct spi_device *spi, int value) +{ +#if 0 + struct glamo_spi *gs = to_gs(spi); + + dev_dbg(&spi->dev, "chipsel %d: spi=%p, gs=%p, info=%p, handle=%p\n", + value, spi, gs, gs->info, gs->info->glamofb_handle); + + glamofb_cmd_mode(gs->info->glamofb_handle, value); +#endif +} + +static int glamo_spi_txrx(struct spi_device *spi, struct spi_transfer *t) +{ + struct glamo_spi *gs = to_gs(spi); + const u_int16_t *ui16 = (const u_int16_t *) t->tx_buf; + u_int16_t nine_bits; + int i; + + dev_dbg(&spi->dev, "txrx: tx %p, rx %p, bpw %d, len %d\n", + t->tx_buf, t->rx_buf, t->bits_per_word, t->len); + + if (spi->bits_per_word == 9) + nine_bits = (1 << 9); + else + nine_bits = 0; + + if (t->len > 3 * sizeof(u_int16_t)) { + dev_err(&spi->dev, "this driver doesn't support " + "%u sized xfers\n", t->len); + return -EINVAL; + } + + for (i = 0; i < t->len/sizeof(u_int16_t); i++) { + /* actually transfer the data */ +#if 1 + glamofb_cmd_write(gs->info->glamofb_handle, + GLAMO_LCD_CMD_TYPE_SERIAL | nine_bits | + (1 << 10) | (1 << 11) | (ui16[i] & 0x1ff)); +#endif + /* FIXME: fire ?!? */ + if (i == 0 && (ui16[i] & 0x1ff) == 0x29) { + dev_dbg(&spi->dev, "leaving command mode\n"); + glamofb_cmd_mode(gs->info->glamofb_handle, 0); + } + } + + return t->len; +} + +static int glamo_spi_setup(struct spi_device *spi) +{ + int ret; + + if (!spi->bits_per_word) + spi->bits_per_word = 9; + + /* FIXME: hardware can do this */ + if (spi->mode & SPI_LSB_FIRST) + return -EINVAL; + + ret = glamo_spi_setupxfer(spi, NULL); + if (ret < 0) { + dev_err(&spi->dev, "setupxfer returned %d\n", ret); + return ret; + } + + dev_dbg(&spi->dev, "%s: mode %d, %u bpw\n", + __FUNCTION__, spi->mode, spi->bits_per_word); + + return 0; +} + +static int glamo_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct glamo_spi *sp; + int ret; + int i; + + master = spi_alloc_master(&pdev->dev, sizeof(struct glamo_spi)); + if (master == NULL) { + dev_err(&pdev->dev, "failed to allocate spi master\n"); + ret = -ENOMEM; + goto err; + } + + sp = spi_master_get_devdata(master); + memset(sp, 0, sizeof(struct glamo_spi)); + + sp->master = spi_master_get(master); + sp->info = pdev->dev.platform_data; + if (!sp->info) { + dev_err(&pdev->dev, "can't operate without platform data\n"); + ret = -EIO; + goto err_no_pdev; + } + dev_dbg(&pdev->dev, "sp->info(pdata) = %p\n", sp->info); + + sp->dev = &pdev->dev; + + platform_set_drvdata(pdev, sp); + + sp->bitbang.master = sp->master; + sp->bitbang.setup_transfer = glamo_spi_setupxfer; + sp->bitbang.chipselect = glamo_spi_chipsel; + sp->bitbang.txrx_bufs = glamo_spi_txrx; + sp->bitbang.master->setup = glamo_spi_setup; + + ret = spi_bitbang_start(&sp->bitbang); + if (ret) + goto err_no_bitbang; + + /* register the chips to go with the board */ + + glamofb_cmd_mode(sp->info->glamofb_handle, 1); + + for (i = 0; i < sp->info->board_size; i++) { + dev_info(&pdev->dev, "registering %p: %s\n", + &sp->info->board_info[i], + sp->info->board_info[i].modalias); + + sp->info->board_info[i].controller_data = sp; + spi_new_device(master, sp->info->board_info + i); + } + + return 0; + +err_no_bitbang: + platform_set_drvdata(pdev, NULL); +err_no_pdev: + spi_master_put(sp->bitbang.master); +err: + return ret; + +} + +static int glamo_spi_remove(struct platform_device *pdev) +{ + struct glamo_spi *sp = platform_get_drvdata(pdev); + + spi_bitbang_stop(&sp->bitbang); + spi_master_put(sp->bitbang.master); + + return 0; +} + +#define glamo_spi_suspend NULL +#define glamo_spi_resume NULL + +static struct platform_driver glamo_spi_drv = { + .probe = glamo_spi_probe, + .remove = glamo_spi_remove, + .suspend = glamo_spi_suspend, + .resume = glamo_spi_resume, + .driver = { + .name = "glamo-lcm-spi", + .owner = THIS_MODULE, + }, +}; + +static int __init glamo_spi_init(void) +{ + return platform_driver_register(&glamo_spi_drv); +} + +static void __exit glamo_spi_exit(void) +{ + platform_driver_unregister(&glamo_spi_drv); +} + +module_init(glamo_spi_init); +module_exit(glamo_spi_exit); + +MODULE_DESCRIPTION("Smedia Glamo 336x/337x LCM serial command SPI Driver"); +MODULE_AUTHOR("Harald Welte <laforge@openmoko.org>") +MODULE_LICENSE("GPL"); |