This is a driver for the S6E63D6 SPI OLED display controller from Samsung. It only provides access to controller's registers so the client can freely configure it. Signed-off-by: Guennadi Liakhovetski <lg@denx.de> Acked-by: Anatolij Gustschin <agust@denx.de>master
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/*
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* Copyright (C) 2009 |
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* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de> |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#include <spi.h> |
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#include <s6e63d6.h> |
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/*
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* Each transfer is performed as: |
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* 1. chip-select active |
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* 2. send 8-bit start code |
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* 3. send 16-bit data |
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* 4. chip-select inactive |
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*/ |
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static int send_word(struct s6e63d6 *data, u8 rs, u16 word) |
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{ |
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/*
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* The start byte looks like (binary): |
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* 01110<ID><RS><R/W> |
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* RS is 0 for index or 1 for data, and R/W is 0 for write. |
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*/ |
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u32 buf8 = 0x70 | data->id | (rs & 2); |
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u32 buf16 = cpu_to_le16(word); |
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u32 buf_in; |
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int err; |
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err = spi_xfer(data->slave, 8, &buf8, &buf_in, SPI_XFER_BEGIN); |
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if (err) |
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return err; |
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return spi_xfer(data->slave, 16, &buf16, &buf_in, SPI_XFER_END); |
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} |
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/* Index and param differ in Register Select bit */ |
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int s6e63d6_index(struct s6e63d6 *data, u8 idx) |
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{ |
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return send_word(data, 0, idx); |
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} |
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int s6e63d6_param(struct s6e63d6 *data, u16 param) |
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{ |
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return send_word(data, 2, param); |
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} |
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int s6e63d6_init(struct s6e63d6 *data) |
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{ |
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if (data->id != 0 && data->id != 4) { |
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printf("s6e63d6: invalid ID %u\n", data->id); |
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return 1; |
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} |
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data->slave = spi_setup_slave(data->bus, data->cs, 100000, SPI_MODE_3); |
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if (!data->slave) |
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return 1; |
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return 0; |
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} |
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/*
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* Copyright (C) 2009 |
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* Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de> |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#ifndef _S6E63D6_H_ |
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#define _S6E63D6_H_ |
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struct s6e63d6 { |
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unsigned int bus; |
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unsigned int cs; |
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unsigned int id; |
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struct spi_slave *slave; |
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}; |
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extern int s6e63d6_init(struct s6e63d6 *data); |
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extern int s6e63d6_index(struct s6e63d6 *data, u8 idx); |
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extern int s6e63d6_param(struct s6e63d6 *data, u16 param); |
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#endif |
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