--- /dev/null
+/*
+ * drivers/i2c/chips/lp5521.c
+ *
+ * Copyright (C) 2007 Nokia Corporation
+ *
+ * Written by Mathias Nyman <mathias.nyman@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <asm/arch/gpio.h>
+
+#define LP5521_DRIVER_NAME "lp5521"
+
+#ifdef LED_CONNECTED_WRONG
+#define LP5521_REG_R_PWM 0x04
+#define LP5521_REG_B_PWM 0x02
+#else
+#define LP5521_REG_R_PWM 0x02
+#define LP5521_REG_B_PWM 0x04
+#endif
+#define LP5521_REG_ENABLE 0x00
+#define LP5521_REG_OP_MODE 0x01
+#define LP5521_REG_G_PWM 0x03
+#define LP5521_REG_R_CNTRL 0x05
+#define LP5521_REG_G_CNTRL 0x06
+#define LP5521_REG_B_CNTRL 0x07
+#define LP5521_REG_MISC 0x08
+#define LP5521_REG_R_CHANNEL_PC 0x09
+#define LP5521_REG_G_CHANNEL_PC 0x0a
+#define LP5521_REG_B_CHANNEL_PC 0x0b
+#define LP5521_REG_STATUS 0x0c
+#define LP5521_REG_RESET 0x0d
+#define LP5521_REG_GPO 0x0e
+#define LP5521_REG_R_PROG_MEM 0x10
+#define LP5521_REG_G_PROG_MEM 0x30
+#define LP5521_REG_B_PROG_MEM 0x50
+
+#define LP5521_MODE_LOAD "load"
+#define LP5521_MODE_RUN "run"
+#define LP5521_MODE_DIRECT_CONTROL "direct"
+
+#define LP5521_CURRENT_1m5 0x0f
+#define LP5521_CURRENT_3m1 0x1f
+#define LP5521_CURRENT_4m7 0x2f
+#define LP5521_CURRENT_6m3 0x3f
+#define LP5521_CURRENT_7m9 0x4f
+#define LP5521_CURRENT_9m5 0x5f
+#define LP5521_CURRENT_11m1 0x6f
+#define LP5521_CURRENT_12m7 0x7f
+#define LP5521_CURRENT_14m3 0x8f
+#define LP5521_CURRENT_15m9 0x9f
+#define LP5521_CURRENT_17m5 0xaf
+#define LP5521_CURRENT_19m1 0xbf
+#define LP5521_CURRENT_20m7 0xcf
+#define LP5521_CURRENT_22m3 0xdf
+#define LP5521_CURRENT_23m9 0xef
+#define LP5521_CURRENT_25m5 0xff
+
+#define LP5521_PROGRAM_LENGTH 32 /* in bytes */
+
+struct lp5521_chip {
+ struct mutex lock;
+ struct i2c_client *client;
+ char *mode;
+ int red;
+ int green;
+ int blue;
+};
+
+static int lp5521_set_mode(struct lp5521_chip *chip, char *mode);
+
+static int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
+{
+ return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
+{
+ s32 ret = i2c_smbus_read_byte_data(client, reg);
+
+ if (ret < 0)
+ return -EIO;
+
+ *buf = ret;
+ return 0;
+}
+
+static int lp5521_configure(struct i2c_client *client)
+{
+ int ret = 0;
+
+ /* Enable chip and set light to logarithmic mode*/
+ ret |= lp5521_write(client, LP5521_REG_ENABLE, 0xc0);
+
+ /* setting all color pwms to direct control mode */
+ ret |= lp5521_write(client, LP5521_REG_OP_MODE, 0x3f);
+
+ /* setting current to 4.7 mA for all channels */
+ ret |= lp5521_write(client, LP5521_REG_R_CNTRL, LP5521_CURRENT_4m7);
+ ret |= lp5521_write(client, LP5521_REG_G_CNTRL, LP5521_CURRENT_4m7);
+ ret |= lp5521_write(client, LP5521_REG_B_CNTRL, LP5521_CURRENT_4m7);
+
+ /* Enable auto-powersave, set charge pump to auto, red to battery */
+ ret |= lp5521_write(client, LP5521_REG_MISC, 0x3c);
+
+ /* initialize all channels pwm to zero */
+ ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
+ ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
+ ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
+
+ /* Not much can be done about errors at this point */
+ return ret;
+}
+
+static int lp5521_load_program(struct lp5521_chip *chip, u8 *pattern)
+{
+ struct i2c_client *client = chip->client;
+ int ret = 0;
+
+ /* Enter load program mode for all led channels */
+ ret |= lp5521_write(client, LP5521_REG_OP_MODE, 0x15); /* 0001 0101 */
+ if (ret)
+ return ret;
+
+ if (chip->red)
+ ret |= i2c_smbus_write_i2c_block_data(client,
+ LP5521_REG_R_PROG_MEM,
+ LP5521_PROGRAM_LENGTH,
+ pattern);
+ if (chip->green)
+ ret |= i2c_smbus_write_i2c_block_data(client,
+ LP5521_REG_G_PROG_MEM,
+ LP5521_PROGRAM_LENGTH,
+ pattern);
+ if (chip->blue)
+ ret |= i2c_smbus_write_i2c_block_data(client,
+ LP5521_REG_B_PROG_MEM,
+ LP5521_PROGRAM_LENGTH,
+ pattern);
+
+ return ret;
+}
+
+static int lp5521_run_program(struct lp5521_chip *chip)
+{
+ struct i2c_client *client = chip->client;
+ int ret;
+ u8 mask = 0xc0;
+ u8 exec_state = 0;
+ u8 enable_reg;
+
+ ret = lp5521_read(client, LP5521_REG_ENABLE, &enable_reg);
+ if (ret)
+ goto fail;
+
+ enable_reg &= mask;
+
+ /* set all active channels exec state to countinous run*/
+ exec_state |= (chip->red << 5);
+ exec_state |= (chip->green << 3);
+ exec_state |= (chip->blue << 1);
+
+ enable_reg |= exec_state;
+
+ ret |= lp5521_write(client, LP5521_REG_ENABLE, enable_reg);
+
+ /* set op-mode to run for active channels, disabled for others */
+ ret |= lp5521_write(client, LP5521_REG_OP_MODE, exec_state);
+
+fail:
+ return ret;
+}
+
+/*--------------------------------------------------------------*/
+/* Sysfs interface */
+/*--------------------------------------------------------------*/
+
+static ssize_t show_active_channels(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct lp5521_chip *chip = dev_get_drvdata(dev);
+ char channels[4];
+ int pos = 0;
+
+#ifdef LED_CONNECTED_WRONG
+ if (chip->blue)
+ pos += sprintf(channels + pos, "r");
+ if (chip->green)
+ pos += sprintf(channels + pos, "g");
+ if (chip->red)
+ pos += sprintf(channels + pos, "b");
+
+#else
+ if (chip->red)
+ pos += sprintf(channels + pos, "r");
+ if (chip->green)
+ pos += sprintf(channels + pos, "g");
+ if (chip->blue)
+ pos += sprintf(channels + pos, "b");
+#endif
+
+ channels[pos] = '\0';
+
+ return sprintf(buf, "%s\n", channels);
+}
+
+static ssize_t store_active_channels(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct lp5521_chip *chip = dev_get_drvdata(dev);
+
+ chip->red = 0;
+ chip->green = 0;
+ chip->blue = 0;
+
+#ifdef LED_CONNECTED_WRONG
+ if (strchr(buf, 'r') != NULL)
+ chip->blue = 1;
+ if (strchr(buf, 'b') != NULL)
+ chip->red = 1;
+#else
+ if (strchr(buf, 'r') != NULL)
+ chip->red = 1;
+ if (strchr(buf, 'b') != NULL)
+ chip->blue = 1;
+#endif
+ if (strchr(buf, 'g') != NULL)
+ chip->green = 1;
+
+ return len;
+}
+
+static ssize_t show_color(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret = 0;
+ u8 r, g, b;
+
+ ret |= lp5521_read(client, LP5521_REG_R_PWM, &r);
+ ret |= lp5521_read(client, LP5521_REG_G_PWM, &g);
+ ret |= lp5521_read(client, LP5521_REG_B_PWM, &b);
+
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%.2x:%.2x:%.2x\n", r, g, b);
+}
+
+static ssize_t store_color(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lp5521_chip *chip = i2c_get_clientdata(client);
+ int ret;
+ unsigned r, g, b;
+
+
+ ret = sscanf(buf, "%2x:%2x:%2x", &r, &g, &b);
+ if (ret != 3)
+ return -EINVAL;
+
+ mutex_lock(&chip->lock);
+
+ ret = lp5521_write(client, LP5521_REG_R_PWM, (u8)r);
+ ret = lp5521_write(client, LP5521_REG_G_PWM, (u8)g);
+ ret = lp5521_write(client, LP5521_REG_B_PWM, (u8)b);
+
+ mutex_unlock(&chip->lock);
+
+ return len;
+}
+
+static ssize_t store_load(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct lp5521_chip *chip = dev_get_drvdata(dev);
+ int ret, nrchars, offset = 0, i = 0;
+ char c[3];
+ unsigned cmd;
+ u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
+
+ while ((offset < len - 1) && (i < LP5521_PROGRAM_LENGTH)) {
+
+ /* separate sscanfs because length is working only for %s */
+ ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
+ ret = sscanf(c, "%2x", &cmd);
+ if (ret != 1)
+ goto fail;
+ pattern[i] = (u8)cmd;
+
+ offset += nrchars;
+ i++;
+ }
+
+ /* pattern commands are always two bytes long */
+ if (i % 2)
+ goto fail;
+
+ mutex_lock(&chip->lock);
+
+ ret = lp5521_load_program(chip, pattern);
+ mutex_unlock(&chip->lock);
+
+ if (ret) {
+ dev_err(dev, "lp5521 failed loading pattern\n");
+ return ret;
+ }
+
+ return len;
+fail:
+ dev_err(dev, "lp5521 wrong pattern format\n");
+ return -EINVAL;
+}
+
+static ssize_t show_mode(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct lp5521_chip *chip = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", chip->mode);
+}
+
+static ssize_t store_mode(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct lp5521_chip *chip = dev_get_drvdata(dev);
+
+ mutex_lock(&chip->lock);
+
+ if (!strncmp(buf, "run", 3))
+ lp5521_set_mode(chip, LP5521_MODE_RUN);
+ else if (!strncmp(buf, "load", 4))
+ lp5521_set_mode(chip, LP5521_MODE_LOAD);
+ else if (!strncmp(buf, "direct", 6))
+ lp5521_set_mode(chip, LP5521_MODE_DIRECT_CONTROL);
+
+ mutex_unlock(&chip->lock);
+
+ return len;
+}
+
+static ssize_t show_current(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret = 0;
+ u8 r_curr, g_curr, b_curr;
+
+ ret |= lp5521_read(client, LP5521_REG_R_CNTRL, &r_curr);
+ ret |= lp5521_read(client, LP5521_REG_G_CNTRL, &g_curr);
+ ret |= lp5521_read(client, LP5521_REG_B_CNTRL, &b_curr);
+
+ if (ret)
+ return ret;
+
+ r_curr = r_curr >> 4;
+ g_curr = g_curr >> 4;
+ b_curr = b_curr >> 4;
+
+ if (r_curr == g_curr && g_curr == b_curr)
+ return sprintf(buf, "%x\n", r_curr);
+ else
+ return sprintf(buf, "%x %x %x\n", r_curr, g_curr, b_curr);
+}
+
+static ssize_t store_current(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct lp5521_chip *chip = dev_get_drvdata(dev);
+ struct i2c_client *client = chip->client;
+ int ret;
+ unsigned curr;
+
+ ret = sscanf(buf, "%1x", &curr);
+ if (ret != 1)
+ return -EINVAL;
+
+ /* current level is determined by the 4 upper bits, rest is ones */
+ curr = (curr << 4) | 0x0f;
+
+ mutex_lock(&chip->lock);
+
+ ret |= lp5521_write(client, LP5521_REG_R_CNTRL, (u8)curr);
+ ret |= lp5521_write(client, LP5521_REG_G_CNTRL, (u8)curr);
+ ret |= lp5521_write(client, LP5521_REG_B_CNTRL, (u8)curr);
+
+ mutex_unlock(&chip->lock);
+
+ return len;
+}
+
+static DEVICE_ATTR(color, S_IRUGO | S_IWUGO, show_color, store_color);
+static DEVICE_ATTR(load, S_IWUGO, NULL, store_load);
+static DEVICE_ATTR(mode, S_IRUGO | S_IWUGO, show_mode, store_mode);
+static DEVICE_ATTR(active_channels, S_IRUGO | S_IWUGO,
+ show_active_channels, store_active_channels);
+static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
+
+static int lp5521_register_sysfs(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ int ret;
+
+ ret = device_create_file(dev, &dev_attr_color);
+ if (ret)
+ goto fail1;
+ ret = device_create_file(dev, &dev_attr_load);
+ if (ret)
+ goto fail2;
+ ret = device_create_file(dev, &dev_attr_active_channels);
+ if (ret)
+ goto fail3;
+ ret = device_create_file(dev, &dev_attr_mode);
+ if (ret)
+ goto fail4;
+ ret = device_create_file(dev, &dev_attr_led_current);
+ if (ret)
+ goto fail5;
+ return 0;
+
+fail5:
+ device_remove_file(dev, &dev_attr_mode);
+fail4:
+ device_remove_file(dev, &dev_attr_active_channels);
+fail3:
+ device_remove_file(dev, &dev_attr_load);
+fail2:
+ device_remove_file(dev, &dev_attr_color);
+fail1:
+ return ret;
+}
+
+static void lp5521_unregister_sysfs(struct i2c_client *client)
+{
+ struct lp5521_chip *chip = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+
+ device_remove_file(dev, &dev_attr_led_current);
+ device_remove_file(dev, &dev_attr_mode);
+ device_remove_file(dev, &dev_attr_active_channels);
+ device_remove_file(dev, &dev_attr_color);
+
+ if (!strcmp(chip->mode, LP5521_MODE_LOAD))
+ device_remove_file(dev, &dev_attr_load);
+}
+
+/*--------------------------------------------------------------*/
+/* Set chip operating mode */
+/*--------------------------------------------------------------*/
+
+static int lp5521_set_mode(struct lp5521_chip *chip, char *mode)
+{
+ struct i2c_client *client = chip->client ;
+ int ret = 0;
+
+ /* if in that mode already do nothing, except for run */
+ if (!strcmp(mode, chip->mode) && strcmp(mode, LP5521_MODE_RUN))
+ return 0;
+
+ if (!strcmp(mode, LP5521_MODE_RUN))
+ ret = lp5521_run_program(chip);
+
+ if (!strcmp(mode, LP5521_MODE_LOAD))
+ ret |= lp5521_write(client, LP5521_REG_OP_MODE, 0x15);
+
+ if (!strcmp(mode, LP5521_MODE_DIRECT_CONTROL))
+ ret |= lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
+
+ chip->mode = mode;
+
+ return ret;
+}
+
+/*--------------------------------------------------------------*/
+/* Probe, Attach, Remove */
+/*--------------------------------------------------------------*/
+static struct i2c_driver lp5521_driver;
+
+static int lp5521_probe(struct i2c_client *client)
+{
+ struct lp5521_chip *chip;
+ int ret = 0;
+
+ chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->client = client;
+ strncpy(client->name, LP5521_DRIVER_NAME, I2C_NAME_SIZE);
+ i2c_set_clientdata(client, chip);
+
+ mutex_init(&chip->lock);
+
+ ret = lp5521_configure(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "lp5521 error configuring chip \n");
+ goto fail1;
+ }
+
+ /* Set default values */
+ chip->mode = LP5521_MODE_DIRECT_CONTROL;
+ chip->red = 1;
+ chip->green = 1;
+ chip->blue = 1;
+
+ ret = lp5521_register_sysfs(client);
+ if (ret)
+ dev_err(&client->dev, "lp5521 registering sysfs failed \n");
+
+ return ret;
+
+fail1:
+ kfree(chip);
+ return ret;
+}
+
+static int lp5521_remove(struct i2c_client *client)
+{
+ struct lp5521_chip *chip = i2c_get_clientdata(client);
+
+ lp5521_unregister_sysfs(client);
+ kfree(chip);
+
+ return 0;
+}
+
+static struct i2c_driver lp5521_driver = {
+ .driver = {
+ .name = LP5521_DRIVER_NAME,
+ },
+ .probe = lp5521_probe,
+ .remove = __exit_p(lp5521_remove),
+};
+
+static int __init lp5521_init(void)
+{
+ return i2c_add_driver(&lp5521_driver);
+}
+
+static void __exit lp5521_exit(void)
+{
+ i2c_del_driver(&lp5521_driver);
+}
+
+MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
+MODULE_DESCRIPTION("lp5521 LED driver");
+MODULE_LICENSE("GPL");
+
+module_init(lp5521_init);
+module_exit(lp5521_exit);
projects / linux-2.6-omap-h63xx.git / commitdiff