diff options
Diffstat (limited to 'drivers/media/pci/ngene/ngene-i2c.c')
| -rw-r--r-- | drivers/media/pci/ngene/ngene-i2c.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/media/pci/ngene/ngene-i2c.c b/drivers/media/pci/ngene/ngene-i2c.c new file mode 100644 index 000000000..2e9e9774d --- /dev/null +++ b/drivers/media/pci/ngene/ngene-i2c.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * ngene-i2c.c: nGene PCIe bridge driver i2c functions + * + * Copyright (C) 2005-2007 Micronas + * + * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de> + * Modifications for new nGene firmware, + * support for EEPROM-copying, + * support for new dual DVB-S2 card prototype + */ + +/* FIXME - some of these can probably be removed */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/poll.h> +#include <linux/io.h> +#include <asm/div64.h> +#include <linux/pci.h> +#include <linux/pci_ids.h> +#include <linux/timer.h> +#include <linux/byteorder/generic.h> +#include <linux/firmware.h> +#include <linux/vmalloc.h> + +#include "ngene.h" + +/* Firmware command for i2c operations */ +static int ngene_command_i2c_read(struct ngene *dev, u8 adr, + u8 *out, u8 outlen, u8 *in, u8 inlen, int flag) +{ + struct ngene_command com; + + com.cmd.hdr.Opcode = CMD_I2C_READ; + com.cmd.hdr.Length = outlen + 3; + com.cmd.I2CRead.Device = adr << 1; + memcpy(com.cmd.I2CRead.Data, out, outlen); + com.cmd.I2CRead.Data[outlen] = inlen; + com.cmd.I2CRead.Data[outlen + 1] = 0; + com.in_len = outlen + 3; + com.out_len = inlen + 1; + + if (ngene_command(dev, &com) < 0) + return -EIO; + + if ((com.cmd.raw8[0] >> 1) != adr) + return -EIO; + + if (flag) + memcpy(in, com.cmd.raw8, inlen + 1); + else + memcpy(in, com.cmd.raw8 + 1, inlen); + return 0; +} + +static int ngene_command_i2c_write(struct ngene *dev, u8 adr, + u8 *out, u8 outlen) +{ + struct ngene_command com; + + + com.cmd.hdr.Opcode = CMD_I2C_WRITE; + com.cmd.hdr.Length = outlen + 1; + com.cmd.I2CRead.Device = adr << 1; + memcpy(com.cmd.I2CRead.Data, out, outlen); + com.in_len = outlen + 1; + com.out_len = 1; + + if (ngene_command(dev, &com) < 0) + return -EIO; + + if (com.cmd.raw8[0] == 1) + return -EIO; + + return 0; +} + +static void ngene_i2c_set_bus(struct ngene *dev, int bus) +{ + if (!(dev->card_info->i2c_access & 2)) + return; + if (dev->i2c_current_bus == bus) + return; + + switch (bus) { + case 0: + ngene_command_gpio_set(dev, 3, 0); + ngene_command_gpio_set(dev, 2, 1); + break; + + case 1: + ngene_command_gpio_set(dev, 2, 0); + ngene_command_gpio_set(dev, 3, 1); + break; + } + dev->i2c_current_bus = bus; +} + +static int ngene_i2c_master_xfer(struct i2c_adapter *adapter, + struct i2c_msg msg[], int num) +{ + struct ngene_channel *chan = + (struct ngene_channel *)i2c_get_adapdata(adapter); + struct ngene *dev = chan->dev; + + mutex_lock(&dev->i2c_switch_mutex); + ngene_i2c_set_bus(dev, chan->number); + + if (num == 2 && msg[1].flags & I2C_M_RD && !(msg[0].flags & I2C_M_RD)) + if (!ngene_command_i2c_read(dev, msg[0].addr, + msg[0].buf, msg[0].len, + msg[1].buf, msg[1].len, 0)) + goto done; + + if (num == 1 && !(msg[0].flags & I2C_M_RD)) + if (!ngene_command_i2c_write(dev, msg[0].addr, + msg[0].buf, msg[0].len)) + goto done; + if (num == 1 && (msg[0].flags & I2C_M_RD)) + if (!ngene_command_i2c_read(dev, msg[0].addr, NULL, 0, + msg[0].buf, msg[0].len, 0)) + goto done; + + mutex_unlock(&dev->i2c_switch_mutex); + return -EIO; + +done: + mutex_unlock(&dev->i2c_switch_mutex); + return num; +} + + +static u32 ngene_i2c_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm ngene_i2c_algo = { + .master_xfer = ngene_i2c_master_xfer, + .functionality = ngene_i2c_functionality, +}; + +int ngene_i2c_init(struct ngene *dev, int dev_nr) +{ + struct i2c_adapter *adap = &(dev->channel[dev_nr].i2c_adapter); + + i2c_set_adapdata(adap, &(dev->channel[dev_nr])); + + strscpy(adap->name, "nGene", sizeof(adap->name)); + + adap->algo = &ngene_i2c_algo; + adap->algo_data = (void *)&(dev->channel[dev_nr]); + adap->dev.parent = &dev->pci_dev->dev; + + return i2c_add_adapter(adap); +} + |