188 lines
5.0 KiB
C
188 lines
5.0 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*/
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#include <linux/i2c-algo-bit.h>
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#include <linux/i2c.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_print.h>
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#include "ast_ddc.h"
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#include "ast_drv.h"
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struct ast_ddc {
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struct ast_device *ast;
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struct i2c_algo_bit_data bit;
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struct i2c_adapter adapter;
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};
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static void ast_ddc_algo_bit_data_setsda(void *data, int state)
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{
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struct ast_ddc *ddc = data;
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struct ast_device *ast = ddc->ast;
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int i;
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u8 ujcrb7, jtemp;
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for (i = 0; i < 0x10000; i++) {
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ujcrb7 = ((state & 0x01) ? 0 : 1) << 2;
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ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0xf1, ujcrb7);
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jtemp = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x04);
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if (ujcrb7 == jtemp)
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break;
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}
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}
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static void ast_ddc_algo_bit_data_setscl(void *data, int state)
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{
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struct ast_ddc *ddc = data;
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struct ast_device *ast = ddc->ast;
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int i;
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u8 ujcrb7, jtemp;
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for (i = 0; i < 0x10000; i++) {
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ujcrb7 = ((state & 0x01) ? 0 : 1);
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ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0xf4, ujcrb7);
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jtemp = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x01);
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if (ujcrb7 == jtemp)
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break;
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}
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}
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static int ast_ddc_algo_bit_data_pre_xfer(struct i2c_adapter *adapter)
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{
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struct ast_ddc *ddc = i2c_get_adapdata(adapter);
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struct ast_device *ast = ddc->ast;
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/*
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* Protect access to I/O registers from concurrent modesetting
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* by acquiring the I/O-register lock.
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*/
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mutex_lock(&ast->modeset_lock);
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return 0;
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}
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static void ast_ddc_algo_bit_data_post_xfer(struct i2c_adapter *adapter)
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{
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struct ast_ddc *ddc = i2c_get_adapdata(adapter);
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struct ast_device *ast = ddc->ast;
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mutex_unlock(&ast->modeset_lock);
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}
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static int ast_ddc_algo_bit_data_getsda(void *data)
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{
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struct ast_ddc *ddc = data;
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struct ast_device *ast = ddc->ast;
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uint32_t val, val2, count, pass;
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count = 0;
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pass = 0;
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val = (ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x20) >> 5) & 0x01;
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do {
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val2 = (ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x20) >> 5) & 0x01;
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if (val == val2) {
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pass++;
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} else {
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pass = 0;
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val = (ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x20) >> 5) & 0x01;
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}
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} while ((pass < 5) && (count++ < 0x10000));
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return val & 1 ? 1 : 0;
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}
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static int ast_ddc_algo_bit_data_getscl(void *data)
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{
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struct ast_ddc *ddc = data;
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struct ast_device *ast = ddc->ast;
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uint32_t val, val2, count, pass;
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count = 0;
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pass = 0;
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val = (ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x10) >> 4) & 0x01;
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do {
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val2 = (ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x10) >> 4) & 0x01;
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if (val == val2) {
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pass++;
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} else {
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pass = 0;
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val = (ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xb7, 0x10) >> 4) & 0x01;
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}
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} while ((pass < 5) && (count++ < 0x10000));
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return val & 1 ? 1 : 0;
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}
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static void ast_ddc_release(struct drm_device *dev, void *res)
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{
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struct ast_ddc *ddc = res;
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i2c_del_adapter(&ddc->adapter);
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}
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struct i2c_adapter *ast_ddc_create(struct ast_device *ast)
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{
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struct drm_device *dev = &ast->base;
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struct ast_ddc *ddc;
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struct i2c_adapter *adapter;
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struct i2c_algo_bit_data *bit;
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int ret;
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ddc = drmm_kzalloc(dev, sizeof(*ddc), GFP_KERNEL);
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if (!ddc)
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return ERR_PTR(-ENOMEM);
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ddc->ast = ast;
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bit = &ddc->bit;
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bit->data = ddc;
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bit->setsda = ast_ddc_algo_bit_data_setsda;
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bit->setscl = ast_ddc_algo_bit_data_setscl;
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bit->getsda = ast_ddc_algo_bit_data_getsda;
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bit->getscl = ast_ddc_algo_bit_data_getscl;
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bit->pre_xfer = ast_ddc_algo_bit_data_pre_xfer;
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bit->post_xfer = ast_ddc_algo_bit_data_post_xfer;
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bit->udelay = 20;
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bit->timeout = usecs_to_jiffies(2200);
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adapter = &ddc->adapter;
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adapter->owner = THIS_MODULE;
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adapter->algo_data = bit;
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adapter->dev.parent = dev->dev;
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snprintf(adapter->name, sizeof(adapter->name), "AST DDC bus");
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i2c_set_adapdata(adapter, ddc);
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ret = i2c_bit_add_bus(adapter);
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if (ret) {
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drm_err(dev, "Failed to register bit i2c\n");
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return ERR_PTR(ret);
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}
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ret = drmm_add_action_or_reset(dev, ast_ddc_release, ddc);
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if (ret)
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return ERR_PTR(ret);
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return &ddc->adapter;
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}
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