153 lines
4.2 KiB
C
153 lines
4.2 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 <drm/drm_managed.h>
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#include <drm/drm_print.h>
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#include "ast_drv.h"
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static void ast_i2c_setsda(void *i2c_priv, int data)
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{
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struct ast_i2c_chan *i2c = i2c_priv;
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struct ast_private *ast = to_ast_private(i2c->dev);
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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 = ((data & 0x01) ? 0 : 1) << 2;
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ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf1, ujcrb7);
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jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 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_i2c_setscl(void *i2c_priv, int clock)
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{
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struct ast_i2c_chan *i2c = i2c_priv;
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struct ast_private *ast = to_ast_private(i2c->dev);
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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 = ((clock & 0x01) ? 0 : 1);
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ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb7, 0xf4, ujcrb7);
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jtemp = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 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_i2c_getsda(void *i2c_priv)
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{
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struct ast_i2c_chan *i2c = i2c_priv;
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struct ast_private *ast = to_ast_private(i2c->dev);
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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_CRTC_PORT, 0xb7, 0x20) >> 5) & 0x01;
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do {
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val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 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_CRTC_PORT, 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_i2c_getscl(void *i2c_priv)
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{
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struct ast_i2c_chan *i2c = i2c_priv;
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struct ast_private *ast = to_ast_private(i2c->dev);
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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_CRTC_PORT, 0xb7, 0x10) >> 4) & 0x01;
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do {
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val2 = (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 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_CRTC_PORT, 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_i2c_release(struct drm_device *dev, void *res)
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{
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struct ast_i2c_chan *i2c = res;
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i2c_del_adapter(&i2c->adapter);
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kfree(i2c);
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}
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struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev)
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{
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struct ast_i2c_chan *i2c;
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int ret;
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i2c = kzalloc(sizeof(struct ast_i2c_chan), GFP_KERNEL);
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if (!i2c)
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return NULL;
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i2c->adapter.owner = THIS_MODULE;
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i2c->adapter.class = I2C_CLASS_DDC;
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i2c->adapter.dev.parent = dev->dev;
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i2c->dev = dev;
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i2c_set_adapdata(&i2c->adapter, i2c);
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snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
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"AST i2c bit bus");
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i2c->adapter.algo_data = &i2c->bit;
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i2c->bit.udelay = 20;
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i2c->bit.timeout = 2;
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i2c->bit.data = i2c;
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i2c->bit.setsda = ast_i2c_setsda;
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i2c->bit.setscl = ast_i2c_setscl;
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i2c->bit.getsda = ast_i2c_getsda;
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i2c->bit.getscl = ast_i2c_getscl;
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ret = i2c_bit_add_bus(&i2c->adapter);
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if (ret) {
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drm_err(dev, "Failed to register bit i2c\n");
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goto out_kfree;
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}
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ret = drmm_add_action_or_reset(dev, ast_i2c_release, i2c);
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if (ret)
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return NULL;
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return i2c;
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out_kfree:
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kfree(i2c);
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return NULL;
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}
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