--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the TI TPS23881 PoE PSE Controller driver (I2C bus)
+ *
+ * Copyright (c) 2023 Bootlin, Kory Maincent <kory.maincent@bootlin.com>
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pse-pd/pse.h>
+
+#define TPS23881_MAX_CHANS 8
+
+#define TPS23881_REG_PW_STATUS 0x10
+#define TPS23881_REG_OP_MODE 0x12
+#define TPS23881_OP_MODE_SEMIAUTO 0xaaaa
+#define TPS23881_REG_DIS_EN 0x13
+#define TPS23881_REG_DET_CLA_EN 0x14
+#define TPS23881_REG_GEN_MASK 0x17
+#define TPS23881_REG_NBITACC BIT(5)
+#define TPS23881_REG_PW_EN 0x19
+#define TPS23881_REG_PORT_MAP 0x26
+#define TPS23881_REG_PORT_POWER 0x29
+#define TPS23881_REG_POEPLUS 0x40
+#define TPS23881_REG_TPON BIT(0)
+#define TPS23881_REG_FWREV 0x41
+#define TPS23881_REG_DEVID 0x43
+#define TPS23881_REG_SRAM_CTRL 0x60
+#define TPS23881_REG_SRAM_DATA 0x61
+
+struct tps23881_port_desc {
+ u8 chan[2];
+ bool is_4p;
+};
+
+struct tps23881_priv {
+ struct i2c_client *client;
+ struct pse_controller_dev pcdev;
+ struct device_node *np;
+ struct tps23881_port_desc port[TPS23881_MAX_CHANS];
+};
+
+static struct tps23881_priv *to_tps23881_priv(struct pse_controller_dev *pcdev)
+{
+ return container_of(pcdev, struct tps23881_priv, pcdev);
+}
+
+static int tps23881_pi_enable(struct pse_controller_dev *pcdev, int id)
+{
+ struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+ struct i2c_client *client = priv->client;
+ u8 chan;
+ u16 val;
+ int ret;
+
+ if (id >= TPS23881_MAX_CHANS)
+ return -ERANGE;
+
+ ret = i2c_smbus_read_word_data(client, TPS23881_REG_PW_STATUS);
+ if (ret < 0)
+ return ret;
+
+ chan = priv->port[id].chan[0];
+ if (chan < 4)
+ val = (u16)(ret | BIT(chan));
+ else
+ val = (u16)(ret | BIT(chan + 4));
+
+ if (priv->port[id].is_4p) {
+ chan = priv->port[id].chan[1];
+ if (chan < 4)
+ val |= BIT(chan);
+ else
+ val |= BIT(chan + 4);
+ }
+
+ ret = i2c_smbus_write_word_data(client, TPS23881_REG_PW_EN, val);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int tps23881_pi_disable(struct pse_controller_dev *pcdev, int id)
+{
+ struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+ struct i2c_client *client = priv->client;
+ u8 chan;
+ u16 val;
+ int ret;
+
+ if (id >= TPS23881_MAX_CHANS)
+ return -ERANGE;
+
+ ret = i2c_smbus_read_word_data(client, TPS23881_REG_PW_STATUS);
+ if (ret < 0)
+ return ret;
+
+ chan = priv->port[id].chan[0];
+ if (chan < 4)
+ val = (u16)(ret | BIT(chan + 4));
+ else
+ val = (u16)(ret | BIT(chan + 8));
+
+ if (priv->port[id].is_4p) {
+ chan = priv->port[id].chan[1];
+ if (chan < 4)
+ val |= BIT(chan + 4);
+ else
+ val |= BIT(chan + 8);
+ }
+
+ ret = i2c_smbus_write_word_data(client, TPS23881_REG_PW_EN, val);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int tps23881_pi_is_enabled(struct pse_controller_dev *pcdev, int id)
+{
+ struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+ struct i2c_client *client = priv->client;
+ bool enabled;
+ u8 chan;
+ int ret;
+
+ ret = i2c_smbus_read_word_data(client, TPS23881_REG_PW_STATUS);
+ if (ret < 0)
+ return ret;
+
+ chan = priv->port[id].chan[0];
+ if (chan < 4)
+ enabled = ret & BIT(chan);
+ else
+ enabled = ret & BIT(chan + 4);
+
+ if (priv->port[id].is_4p) {
+ chan = priv->port[id].chan[1];
+ if (chan < 4)
+ enabled &= !!(ret & BIT(chan));
+ else
+ enabled &= !!(ret & BIT(chan + 4));
+ }
+
+ /* Return enabled status only if both channel are on this state */
+ return enabled;
+}
+
+static int tps23881_ethtool_get_status(struct pse_controller_dev *pcdev,
+ unsigned long id,
+ struct netlink_ext_ack *extack,
+ struct pse_control_status *status)
+{
+ struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+ struct i2c_client *client = priv->client;
+ bool enabled, delivering;
+ u8 chan;
+ int ret;
+
+ ret = i2c_smbus_read_word_data(client, TPS23881_REG_PW_STATUS);
+ if (ret < 0)
+ return ret;
+
+ chan = priv->port[id].chan[0];
+ if (chan < 4) {
+ enabled = ret & BIT(chan);
+ delivering = ret & BIT(chan + 4);
+ } else {
+ enabled = ret & BIT(chan + 4);
+ delivering = ret & BIT(chan + 8);
+ }
+
+ if (priv->port[id].is_4p) {
+ chan = priv->port[id].chan[1];
+ if (chan < 4) {
+ enabled &= !!(ret & BIT(chan));
+ delivering &= !!(ret & BIT(chan + 4));
+ } else {
+ enabled &= !!(ret & BIT(chan + 4));
+ delivering &= !!(ret & BIT(chan + 8));
+ }
+ }
+
+ /* Return delivering status only if both channel are on this state */
+ if (delivering)
+ status->c33_pw_status = ETHTOOL_C33_PSE_PW_D_STATUS_DELIVERING;
+ else
+ status->c33_pw_status = ETHTOOL_C33_PSE_PW_D_STATUS_DISABLED;
+
+ /* Return enabled status only if both channel are on this state */
+ if (enabled)
+ status->c33_admin_state = ETHTOOL_C33_PSE_ADMIN_STATE_ENABLED;
+ else
+ status->c33_admin_state = ETHTOOL_C33_PSE_ADMIN_STATE_DISABLED;
+
+ return 0;
+}
+
+/* Parse managers subnode into a array of device node */
+static int
+tps23881_get_of_channels(struct tps23881_priv *priv,
+ struct device_node *chan_node[TPS23881_MAX_CHANS])
+{
+ struct device_node *channels_node, *node;
+ int i, ret;
+
+ if (!priv->np)
+ return -EINVAL;
+
+ channels_node = of_find_node_by_name(priv->np, "channels");
+ if (!channels_node)
+ return -EINVAL;
+
+ for_each_child_of_node(channels_node, node) {
+ u32 chan_id;
+
+ if (!of_node_name_eq(node, "channel"))
+ continue;
+
+ ret = of_property_read_u32(node, "reg", &chan_id);
+ if (ret) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (chan_id >= TPS23881_MAX_CHANS || chan_node[chan_id]) {
+ dev_err(&priv->client->dev,
+ "wrong number of port (%d)\n", chan_id);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ of_node_get(node);
+ chan_node[chan_id] = node;
+ }
+
+ of_node_put(channels_node);
+ return 0;
+
+out:
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ of_node_put(chan_node[i]);
+ chan_node[i] = NULL;
+ }
+
+ of_node_put(node);
+ of_node_put(channels_node);
+ return ret;
+}
+
+struct tps23881_port_matrix {
+ u8 pi_id;
+ u8 lgcl_chan[2];
+ u8 hw_chan[2];
+ bool is_4p;
+ bool exist;
+};
+
+static int
+tps23881_match_channel(const struct pse_pi_pairset *pairset,
+ struct device_node *chan_node[TPS23881_MAX_CHANS])
+{
+ int i;
+
+ /* Look on every channels */
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ if (pairset->np == chan_node[i])
+ return i;
+ }
+
+ return -ENODEV;
+}
+
+static bool
+tps23881_is_chan_free(struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS],
+ int chan)
+{
+ int i;
+
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ if (port_matrix[i].exist &&
+ (port_matrix[i].hw_chan[0] == chan ||
+ port_matrix[i].hw_chan[1] == chan))
+ return false;
+ }
+
+ return true;
+}
+
+/* Fill port matrix with the matching channels */
+static int
+tps23881_match_port_matrix(struct pse_pi *pi, int pi_id,
+ struct device_node *chan_node[TPS23881_MAX_CHANS],
+ struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS])
+{
+ int ret;
+
+ if (!pi->pairset[0].np)
+ return 0;
+
+ ret = tps23881_match_channel(&pi->pairset[0], chan_node);
+ if (ret < 0)
+ return ret;
+
+ if (!tps23881_is_chan_free(port_matrix, ret)) {
+ pr_err("tps23881: channel %d already used\n", ret);
+ return -ENODEV;
+ }
+
+ port_matrix[pi_id].hw_chan[0] = ret;
+ port_matrix[pi_id].exist = true;
+
+ if (!pi->pairset[1].np)
+ return 0;
+
+ ret = tps23881_match_channel(&pi->pairset[1], chan_node);
+ if (ret < 0)
+ return ret;
+
+ if (!tps23881_is_chan_free(port_matrix, ret)) {
+ pr_err("tps23881: channel %d already used\n", ret);
+ return -ENODEV;
+ }
+
+ if (port_matrix[pi_id].hw_chan[0] / 4 != ret / 4) {
+ pr_err("tps23881: 4-pair PSE can only be set within the same 4 ports group");
+ return -ENODEV;
+ }
+
+ port_matrix[pi_id].hw_chan[1] = ret;
+ port_matrix[pi_id].is_4p = true;
+
+ return 0;
+}
+
+static int
+tps23881_get_unused_chan(struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS],
+ int port_cnt)
+{
+ bool used;
+ int i, j;
+
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ used = false;
+
+ for (j = 0; j < port_cnt; j++) {
+ if (port_matrix[j].hw_chan[0] == i) {
+ used = true;
+ break;
+ }
+
+ if (port_matrix[j].is_4p &&
+ port_matrix[j].hw_chan[1] == i) {
+ used = true;
+ break;
+ }
+ }
+
+ if (!used)
+ return i;
+ }
+
+ return -ENODEV;
+}
+
+/* Sort the port matrix to following particular hardware ports matrix
+ * specification of the tps23881. The device has two 4-ports groups and
+ * each 4-pair powered device has to be configured to use two consecutive
+ * logical channel in each 4 ports group (1 and 2 or 3 and 4). Also the
+ * hardware matrix has to be fully configured even with unused chan to be
+ * valid.
+ */
+static int
+tps23881_sort_port_matrix(struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS])
+{
+ struct tps23881_port_matrix tmp_port_matrix[TPS23881_MAX_CHANS] = {0};
+ int i, ret, port_cnt = 0, cnt_4ch_grp1 = 0, cnt_4ch_grp2 = 4;
+
+ /* Configure 4p port matrix */
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ int *cnt;
+
+ if (!port_matrix[i].exist || !port_matrix[i].is_4p)
+ continue;
+
+ if (port_matrix[i].hw_chan[0] < 4)
+ cnt = &cnt_4ch_grp1;
+ else
+ cnt = &cnt_4ch_grp2;
+
+ tmp_port_matrix[port_cnt].exist = true;
+ tmp_port_matrix[port_cnt].is_4p = true;
+ tmp_port_matrix[port_cnt].pi_id = i;
+ tmp_port_matrix[port_cnt].hw_chan[0] = port_matrix[i].hw_chan[0];
+ tmp_port_matrix[port_cnt].hw_chan[1] = port_matrix[i].hw_chan[1];
+
+ /* 4-pair ports have to be configured with consecutive
+ * logical channels 0 and 1, 2 and 3.
+ */
+ tmp_port_matrix[port_cnt].lgcl_chan[0] = (*cnt)++;
+ tmp_port_matrix[port_cnt].lgcl_chan[1] = (*cnt)++;
+
+ port_cnt++;
+ }
+
+ /* Configure 2p port matrix */
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ int *cnt;
+
+ if (!port_matrix[i].exist || port_matrix[i].is_4p)
+ continue;
+
+ if (port_matrix[i].hw_chan[0] < 4)
+ cnt = &cnt_4ch_grp1;
+ else
+ cnt = &cnt_4ch_grp2;
+
+ tmp_port_matrix[port_cnt].exist = true;
+ tmp_port_matrix[port_cnt].pi_id = i;
+ tmp_port_matrix[port_cnt].lgcl_chan[0] = (*cnt)++;
+ tmp_port_matrix[port_cnt].hw_chan[0] = port_matrix[i].hw_chan[0];
+
+ port_cnt++;
+ }
+
+ /* Complete the rest of the first 4 port group matrix even if
+ * channels are unused
+ */
+ while (cnt_4ch_grp1 < 4) {
+ ret = tps23881_get_unused_chan(tmp_port_matrix, port_cnt);
+ if (ret < 0) {
+ pr_err("tps23881: port matrix issue, no chan available\n");
+ return ret;
+ }
+
+ if (port_cnt >= TPS23881_MAX_CHANS) {
+ pr_err("tps23881: wrong number of channels\n");
+ return -ENODEV;
+ }
+ tmp_port_matrix[port_cnt].lgcl_chan[0] = cnt_4ch_grp1;
+ tmp_port_matrix[port_cnt].hw_chan[0] = ret;
+ cnt_4ch_grp1++;
+ port_cnt++;
+ }
+
+ /* Complete the rest of the second 4 port group matrix even if
+ * channels are unused
+ */
+ while (cnt_4ch_grp2 < 8) {
+ ret = tps23881_get_unused_chan(tmp_port_matrix, port_cnt);
+ if (ret < 0) {
+ pr_err("tps23881: port matrix issue, no chan available\n");
+ return -ENODEV;
+ }
+
+ if (port_cnt >= TPS23881_MAX_CHANS) {
+ pr_err("tps23881: wrong number of channels\n");
+ return -ENODEV;
+ }
+ tmp_port_matrix[port_cnt].lgcl_chan[0] = cnt_4ch_grp2;
+ tmp_port_matrix[port_cnt].hw_chan[0] = ret;
+ cnt_4ch_grp2++;
+ port_cnt++;
+ }
+
+ memcpy(port_matrix, tmp_port_matrix, sizeof(tmp_port_matrix));
+
+ return port_cnt;
+}
+
+/* Write port matrix to the hardware port matrix and the software port
+ * matrix.
+ */
+static int
+tps23881_write_port_matrix(struct tps23881_priv *priv,
+ struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS],
+ int port_cnt)
+{
+ struct i2c_client *client = priv->client;
+ u8 pi_id, lgcl_chan, hw_chan;
+ u16 val = 0;
+ int i, ret;
+
+ for (i = 0; i < port_cnt; i++) {
+ pi_id = port_matrix[i].pi_id;
+ lgcl_chan = port_matrix[i].lgcl_chan[0];
+ hw_chan = port_matrix[i].hw_chan[0] % 4;
+
+ /* Set software port matrix for existing ports */
+ if (port_matrix[i].exist)
+ priv->port[pi_id].chan[0] = lgcl_chan;
+
+ /* Set hardware port matrix for all ports */
+ val |= hw_chan << (lgcl_chan * 2);
+
+ if (!port_matrix[i].is_4p)
+ continue;
+
+ lgcl_chan = port_matrix[i].lgcl_chan[1];
+ hw_chan = port_matrix[i].hw_chan[1] % 4;
+
+ /* Set software port matrix for existing ports */
+ if (port_matrix[i].exist) {
+ priv->port[pi_id].is_4p = true;
+ priv->port[pi_id].chan[1] = lgcl_chan;
+ }
+
+ /* Set hardware port matrix for all ports */
+ val |= hw_chan << (lgcl_chan * 2);
+ }
+
+ /* Write hardware ports matrix */
+ ret = i2c_smbus_write_word_data(client, TPS23881_REG_PORT_MAP, val);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int
+tps23881_set_ports_conf(struct tps23881_priv *priv,
+ struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS])
+{
+ struct i2c_client *client = priv->client;
+ int i, ret;
+ u16 val;
+
+ /* Set operating mode */
+ ret = i2c_smbus_write_word_data(client, TPS23881_REG_OP_MODE,
+ TPS23881_OP_MODE_SEMIAUTO);
+ if (ret)
+ return ret;
+
+ /* Disable DC disconnect */
+ ret = i2c_smbus_write_word_data(client, TPS23881_REG_DIS_EN, 0x0);
+ if (ret)
+ return ret;
+
+ /* Set port power allocation */
+ val = 0;
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ if (!port_matrix[i].exist)
+ continue;
+
+ if (port_matrix[i].is_4p)
+ val |= 0xf << ((port_matrix[i].lgcl_chan[0] / 2) * 4);
+ else
+ val |= 0x3 << ((port_matrix[i].lgcl_chan[0] / 2) * 4);
+ }
+ ret = i2c_smbus_write_word_data(client, TPS23881_REG_PORT_POWER, val);
+ if (ret)
+ return ret;
+
+ /* Enable detection and classification */
+ val = 0;
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ if (!port_matrix[i].exist)
+ continue;
+
+ val |= BIT(port_matrix[i].lgcl_chan[0]) |
+ BIT(port_matrix[i].lgcl_chan[0] + 4);
+ if (port_matrix[i].is_4p)
+ val |= BIT(port_matrix[i].lgcl_chan[1]) |
+ BIT(port_matrix[i].lgcl_chan[1] + 4);
+ }
+ ret = i2c_smbus_write_word_data(client, TPS23881_REG_DET_CLA_EN, val);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int
+tps23881_set_ports_matrix(struct tps23881_priv *priv,
+ struct device_node *chan_node[TPS23881_MAX_CHANS])
+{
+ struct tps23881_port_matrix port_matrix[TPS23881_MAX_CHANS] = {0};
+ int i, ret;
+
+ /* Update with values for every PSE PIs */
+ for (i = 0; i < TPS23881_MAX_CHANS; i++) {
+ ret = tps23881_match_port_matrix(&priv->pcdev.pi[i], i,
+ chan_node, port_matrix);
+ if (ret)
+ return ret;
+ }
+
+ ret = tps23881_sort_port_matrix(port_matrix);
+ if (ret < 0)
+ return ret;
+
+ ret = tps23881_write_port_matrix(priv, port_matrix, ret);
+ if (ret)
+ return ret;
+
+ ret = tps23881_set_ports_conf(priv, port_matrix);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int tps23881_setup_pi_matrix(struct pse_controller_dev *pcdev)
+{
+ struct device_node *chan_node[TPS23881_MAX_CHANS] = {NULL};
+ struct tps23881_priv *priv = to_tps23881_priv(pcdev);
+ int ret, i;
+
+ ret = tps23881_get_of_channels(priv, chan_node);
+ if (ret < 0) {
+ dev_warn(&priv->client->dev,
+ "Unable to parse port-matrix, default matrix will be used\n");
+ return 0;
+ }
+
+ ret = tps23881_set_ports_matrix(priv, chan_node);
+
+ for (i = 0; i < TPS23881_MAX_CHANS; i++)
+ of_node_put(chan_node[i]);
+
+ return ret;
+}
+
+static const struct pse_controller_ops tps23881_ops = {
+ .setup_pi_matrix = tps23881_setup_pi_matrix,
+ .pi_enable = tps23881_pi_enable,
+ .pi_disable = tps23881_pi_disable,
+ .pi_is_enabled = tps23881_pi_is_enabled,
+ .ethtool_get_status = tps23881_ethtool_get_status,
+};
+
+static const char fw_parity_name[] = "ti/tps23881/tps23881-parity-14.bin";
+static const char fw_sram_name[] = "ti/tps23881/tps23881-sram-14.bin";
+
+struct tps23881_fw_conf {
+ u8 reg;
+ u8 val;
+};
+
+static const struct tps23881_fw_conf tps23881_fw_parity_conf[] = {
+ {.reg = 0x60, .val = 0x01},
+ {.reg = 0x62, .val = 0x00},
+ {.reg = 0x63, .val = 0x80},
+ {.reg = 0x60, .val = 0xC4},
+ {.reg = 0x1D, .val = 0xBC},
+ {.reg = 0xD7, .val = 0x02},
+ {.reg = 0x91, .val = 0x00},
+ {.reg = 0x90, .val = 0x00},
+ {.reg = 0xD7, .val = 0x00},
+ {.reg = 0x1D, .val = 0x00},
+ { /* sentinel */ }
+};
+
+static const struct tps23881_fw_conf tps23881_fw_sram_conf[] = {
+ {.reg = 0x60, .val = 0xC5},
+ {.reg = 0x62, .val = 0x00},
+ {.reg = 0x63, .val = 0x80},
+ {.reg = 0x60, .val = 0xC0},
+ {.reg = 0x1D, .val = 0xBC},
+ {.reg = 0xD7, .val = 0x02},
+ {.reg = 0x91, .val = 0x00},
+ {.reg = 0x90, .val = 0x00},
+ {.reg = 0xD7, .val = 0x00},
+ {.reg = 0x1D, .val = 0x00},
+ { /* sentinel */ }
+};
+
+static int tps23881_flash_sram_fw_part(struct i2c_client *client,
+ const char *fw_name,
+ const struct tps23881_fw_conf *fw_conf)
+{
+ const struct firmware *fw = NULL;
+ int i, ret;
+
+ ret = request_firmware(&fw, fw_name, &client->dev);
+ if (ret)
+ return ret;
+
+ dev_dbg(&client->dev, "Flashing %s\n", fw_name);
+
+ /* Prepare device for RAM download */
+ while (fw_conf->reg) {
+ ret = i2c_smbus_write_byte_data(client, fw_conf->reg,
+ fw_conf->val);
+ if (ret)
+ goto out;
+
+ fw_conf++;
+ }
+
+ /* Flash the firmware file */
+ for (i = 0; i < fw->size; i++) {
+ ret = i2c_smbus_write_byte_data(client,
+ TPS23881_REG_SRAM_DATA,
+ fw->data[i]);
+ if (ret)
+ goto out;
+ }
+
+out:
+ release_firmware(fw);
+ return ret;
+}
+
+static int tps23881_flash_sram_fw(struct i2c_client *client)
+{
+ int ret;
+
+ ret = tps23881_flash_sram_fw_part(client, fw_parity_name,
+ tps23881_fw_parity_conf);
+ if (ret)
+ return ret;
+
+ ret = tps23881_flash_sram_fw_part(client, fw_sram_name,
+ tps23881_fw_sram_conf);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(client, TPS23881_REG_SRAM_CTRL, 0x18);
+ if (ret)
+ return ret;
+
+ mdelay(12);
+
+ return 0;
+}
+
+static int tps23881_i2c_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct tps23881_priv *priv;
+ int ret;
+ u8 val;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(dev, "i2c check functionality failed\n");
+ return -ENXIO;
+ }
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ ret = i2c_smbus_read_byte_data(client, TPS23881_REG_DEVID);
+ if (ret < 0)
+ return ret;
+
+ if (ret != 0x22) {
+ dev_err(dev, "Wrong device ID\n");
+ return -ENXIO;
+ }
+
+ ret = tps23881_flash_sram_fw(client);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_byte_data(client, TPS23881_REG_FWREV);
+ if (ret < 0)
+ return ret;
+
+ dev_info(&client->dev, "Firmware revision 0x%x\n", ret);
+
+ /* Set configuration B, 16 bit access on a single device address */
+ ret = i2c_smbus_read_byte_data(client, TPS23881_REG_GEN_MASK);
+ if (ret < 0)
+ return ret;
+
+ val = ret | TPS23881_REG_NBITACC;
+ ret = i2c_smbus_write_byte_data(client, TPS23881_REG_GEN_MASK, val);
+ if (ret)
+ return ret;
+
+ priv->client = client;
+ i2c_set_clientdata(client, priv);
+ priv->np = dev->of_node;
+
+ priv->pcdev.owner = THIS_MODULE;
+ priv->pcdev.ops = &tps23881_ops;
+ priv->pcdev.dev = dev;
+ priv->pcdev.types = ETHTOOL_PSE_C33;
+ priv->pcdev.nr_lines = TPS23881_MAX_CHANS;
+ ret = devm_pse_controller_register(dev, &priv->pcdev);
+ if (ret) {
+ return dev_err_probe(dev, ret,
+ "failed to register PSE controller\n");
+ }
+
+ return ret;
+}
+
+static const struct i2c_device_id tps23881_id[] = {
+ { "tps23881", 0 },
+ { },
+};
+MODULE_DEVICE_TABLE(i2c, tps23881_id);
+
+static const struct of_device_id tps23881_of_match[] = {
+ { .compatible = "ti,tps23881", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tps23881_of_match);
+
+static struct i2c_driver tps23881_driver = {
+ .probe = tps23881_i2c_probe,
+ .id_table = tps23881_id,
+ .driver = {
+ .name = "tps23881",
+ .of_match_table = tps23881_of_match,
+ },
+};
+module_i2c_driver(tps23881_driver);
+
+MODULE_AUTHOR("Kory Maincent <kory.maincent@bootlin.com>");
+MODULE_DESCRIPTION("TI TPS23881 PoE PSE Controller driver");
+MODULE_LICENSE("GPL");
projects / linux-2.6-microblaze.git / commitdiff